Dependence of distributed generation (DG) outputs and load plays an essential role in renewable energy accommodation. This paper presents a novel DG hosting capacity (DGHC) evaluation method for distribution networks considering high-dimensional dependence relations among solar radiation, wind speed, and various load types (i.e., commercial, residential, and industrial). First, an advanced dependence modeling method called regular vine (R-vine) is applied to capture the complex dependence structure of solar radiation, wind speed, commercial loads, industrial loads, and residential loads. Then, a chance-constrained DGHC evaluation model is employed to figure out maximum hosting capacity of each DG and its optimal allocation plan with different operational risks. Finally, a Benders decomposition algorithm is also employed to reduce computational burden. The proposed approaches are validated using a set of historical data from China. Results show dependence among different DGs and loads has significant impact on hosting capacity. Results also suggest using the R-vine model to capture dependence among distributed energy resources (DERs) and load. This finding provides useful advice for distribution networks in installing renewable energy generations.
{"title":"DG Hosting Capacity Assessment Considering Dependence Among Wind Speed, Solar Radiation, and Load Demands","authors":"Junyi Yang;Jiangmin Bao;Yuhan Hou;Han Wu;Qiang Li;Yue Yuan","doi":"10.17775/CSEEJPES.2021.07270","DOIUrl":"https://doi.org/10.17775/CSEEJPES.2021.07270","url":null,"abstract":"Dependence of distributed generation (DG) outputs and load plays an essential role in renewable energy accommodation. This paper presents a novel DG hosting capacity (DGHC) evaluation method for distribution networks considering high-dimensional dependence relations among solar radiation, wind speed, and various load types (i.e., commercial, residential, and industrial). First, an advanced dependence modeling method called regular vine (R-vine) is applied to capture the complex dependence structure of solar radiation, wind speed, commercial loads, industrial loads, and residential loads. Then, a chance-constrained DGHC evaluation model is employed to figure out maximum hosting capacity of each DG and its optimal allocation plan with different operational risks. Finally, a Benders decomposition algorithm is also employed to reduce computational burden. The proposed approaches are validated using a set of historical data from China. Results show dependence among different DGs and loads has significant impact on hosting capacity. Results also suggest using the R-vine model to capture dependence among distributed energy resources (DERs) and load. This finding provides useful advice for distribution networks in installing renewable energy generations.","PeriodicalId":10729,"journal":{"name":"CSEE Journal of Power and Energy Systems","volume":"10 3","pages":"1011-1025"},"PeriodicalIF":7.1,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10375978","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141304023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-28DOI: 10.17775/CSEEJPES.2023.05960
Jian Hao;Jingwen Zhang;Wenyu Ye;Ruijing Liao;Lijun Yang
Use of traditional mineral oil (MO) as a liquid insulation in transformers has spanned more than 130 years. However, MO has poor heat resistance, a low ignition point, and is a non-renewable resource, which does not meet development requirements for high-performance and environmentally friendly insulation oil. Consequently, researchers have explored alternatives such as natural ester (NE) and synthetic ester (SE) oils, as well as mixed insulation oils. Mixed insulating oil is a blend of diverse insulating oil types, with optimal performance achieved by adjusting proportions of base oils. This article summarizes the innovative achievements and development of mixed insulation oil in terms of development of mixed ratio, basic physical chemical properties, electrical properties, thermal stability, and application including operation and maintenance technology. Through these efforts, this article aims to provide recommendations for future development of mixed insulating oils to advance liquid dielectric research based on enhancement mechanisms.
{"title":"Development of Mixed Insulation Oil as Alternative Liquid Dielectric: A Review","authors":"Jian Hao;Jingwen Zhang;Wenyu Ye;Ruijing Liao;Lijun Yang","doi":"10.17775/CSEEJPES.2023.05960","DOIUrl":"https://doi.org/10.17775/CSEEJPES.2023.05960","url":null,"abstract":"Use of traditional mineral oil (MO) as a liquid insulation in transformers has spanned more than 130 years. However, MO has poor heat resistance, a low ignition point, and is a non-renewable resource, which does not meet development requirements for high-performance and environmentally friendly insulation oil. Consequently, researchers have explored alternatives such as natural ester (NE) and synthetic ester (SE) oils, as well as mixed insulation oils. Mixed insulating oil is a blend of diverse insulating oil types, with optimal performance achieved by adjusting proportions of base oils. This article summarizes the innovative achievements and development of mixed insulation oil in terms of development of mixed ratio, basic physical chemical properties, electrical properties, thermal stability, and application including operation and maintenance technology. Through these efforts, this article aims to provide recommendations for future development of mixed insulating oils to advance liquid dielectric research based on enhancement mechanisms.","PeriodicalId":10729,"journal":{"name":"CSEE Journal of Power and Energy Systems","volume":"10 3","pages":"1242-1258"},"PeriodicalIF":7.1,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10375972","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141304110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The high renewable penetrated power system has severe frequency regulation problems. Distributed resources can provide frequency regulation services but are limited by communication time delay. This paper proposes a communication resources allocation model to reduce communication time delay in frequency regulation service. Communication device resources and wireless spectrum resources are allocated to distributed resources when they participate in frequency regulation. We reveal impact of communication resources allocation on time delay reduction and frequency regulation performance. Besides, we study communication resources allocation solution in high renewable energy penetrated power systems. We provide a case study based on the HRP-38 system. Results show communication time delay decreases distributed resources' ability to provide frequency regulation service. On the other hand, allocating more communication resources to distributed resources' communication services improves their frequency regulation performance. For power systems with renewable energy penetration above 70%, required communications resources are about five times as many as 30% renewable energy penetrated power systems to keep frequency performance the same.
{"title":"Communication Resources Allocation for Time Delay Reduction of Frequency Regulation Service in High Renewable Penetrated Power System","authors":"Hongjie He;Ning Zhang;Chongqing Kang;Song Ci;Fei Teng;Goran Strbac","doi":"10.17775/CSEEJPES.2023.07630","DOIUrl":"https://doi.org/10.17775/CSEEJPES.2023.07630","url":null,"abstract":"The high renewable penetrated power system has severe frequency regulation problems. Distributed resources can provide frequency regulation services but are limited by communication time delay. This paper proposes a communication resources allocation model to reduce communication time delay in frequency regulation service. Communication device resources and wireless spectrum resources are allocated to distributed resources when they participate in frequency regulation. We reveal impact of communication resources allocation on time delay reduction and frequency regulation performance. Besides, we study communication resources allocation solution in high renewable energy penetrated power systems. We provide a case study based on the HRP-38 system. Results show communication time delay decreases distributed resources' ability to provide frequency regulation service. On the other hand, allocating more communication resources to distributed resources' communication services improves their frequency regulation performance. For power systems with renewable energy penetration above 70%, required communications resources are about five times as many as 30% renewable energy penetrated power systems to keep frequency performance the same.","PeriodicalId":10729,"journal":{"name":"CSEE Journal of Power and Energy Systems","volume":"10 2","pages":"468-480"},"PeriodicalIF":7.1,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10376006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140351489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-17DOI: 10.17775/CSEEJPES.2022.06060
Kanhaiya Kumar;Saran Satsangi;Ganesh Balu Kumbhar
A transformer is an essential but expensive power delivery equipment for a distribution utility. In many distribution utilities worldwide, a sizable percentage of transformers are near the end of their designed life. At the same time, distribution utilities are adopting smart inverter-based distributed solar photovoltaic (SPV) systems to maximize renewable generation. The central objective of this paper is to propose a methodology to quantify the effect of smart inverter-based distributed SPV systems on the aging of distribution transformers. The proposed method is first tested on a modified IEEE-123 node distribution feeder. After that, the procedure is applied to a practical distribution system, i.e., the Indian Institute of Technology (IIT) Roorkee campus, India. The transformer aging models, alongside advanced control functionalities of grid-tied smart inverter-based SPV systems, are implemented in MATLAB. The open-source simulation tool (OpenDSS) is used to model distribution net-works. To analyze effectiveness of various inverter functionalities, time-series simulations are performed using exponential load models, considering daily load curves from multiple seasons, load types, current harmonics, etc. Findings show replacing a traditional inverter with a smart inverter-based SPV system can enable local reactive power generation and may extend the life of a distribution transformer. Simulation results demonstrate, simply by incorporating smart inverter-based SPV systems, transformer aging is reduced by 15% to 22% in comparison to SPV systems operating with traditional inverters.
{"title":"Extension of Distribution Transformer Life in the Presence of Smart Inverter-based Distributed Solar Photovoltaic Systems","authors":"Kanhaiya Kumar;Saran Satsangi;Ganesh Balu Kumbhar","doi":"10.17775/CSEEJPES.2022.06060","DOIUrl":"https://doi.org/10.17775/CSEEJPES.2022.06060","url":null,"abstract":"A transformer is an essential but expensive power delivery equipment for a distribution utility. In many distribution utilities worldwide, a sizable percentage of transformers are near the end of their designed life. At the same time, distribution utilities are adopting smart inverter-based distributed solar photovoltaic (SPV) systems to maximize renewable generation. The central objective of this paper is to propose a methodology to quantify the effect of smart inverter-based distributed SPV systems on the aging of distribution transformers. The proposed method is first tested on a modified IEEE-123 node distribution feeder. After that, the procedure is applied to a practical distribution system, i.e., the Indian Institute of Technology (IIT) Roorkee campus, India. The transformer aging models, alongside advanced control functionalities of grid-tied smart inverter-based SPV systems, are implemented in MATLAB. The open-source simulation tool (OpenDSS) is used to model distribution net-works. To analyze effectiveness of various inverter functionalities, time-series simulations are performed using exponential load models, considering daily load curves from multiple seasons, load types, current harmonics, etc. Findings show replacing a traditional inverter with a smart inverter-based SPV system can enable local reactive power generation and may extend the life of a distribution transformer. Simulation results demonstrate, simply by incorporating smart inverter-based SPV systems, transformer aging is reduced by 15% to 22% in comparison to SPV systems operating with traditional inverters.","PeriodicalId":10729,"journal":{"name":"CSEE Journal of Power and Energy Systems","volume":"10 1","pages":"88-95"},"PeriodicalIF":7.1,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10322702","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139694987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-17DOI: 10.17775/CSEEJPES.2021.07900
Haiting Shan;Luliang Zhang;Q. H. Wu;Mengshi Li
Sparse measurements challenge fault location in distribution networks. This paper proposes a method for asymmetric ground fault location in distribution networks with limited measurements. A virtual injected current vector is formulated to estimate the fault line, which can be reconstructed from voltage sags measured at a few buses using compressive sensing (CS). The relationship between the virtual injected current ratio (VICR) and fault position is deduced from circuit analysis to pinpoint the fault. Furthermore, a two-stage recovery strategy is proposed for improving reconstruction accuracy of the current vector, where two different sensing matrixes are utilized to improve the incoherence. The proposed method is validated in IEEE 34 node test feeder. Simulation results show asymmetric ground fault type, resistance, fault position and access of distributed generators (DGs) do not significantly influence performance of our method. In addition, it works effectively under various scenarios of noisy measurement and line parameter error. Validations on 134 node test feeders prove the proposed method is also suitable for systems with more complex structure.
{"title":"Location of Asymmetric Ground Fault Using Virtual Injected Current Ratio and Two-stage Recovery Strategy in Distribution Networks","authors":"Haiting Shan;Luliang Zhang;Q. H. Wu;Mengshi Li","doi":"10.17775/CSEEJPES.2021.07900","DOIUrl":"https://doi.org/10.17775/CSEEJPES.2021.07900","url":null,"abstract":"Sparse measurements challenge fault location in distribution networks. This paper proposes a method for asymmetric ground fault location in distribution networks with limited measurements. A virtual injected current vector is formulated to estimate the fault line, which can be reconstructed from voltage sags measured at a few buses using compressive sensing (CS). The relationship between the virtual injected current ratio (VICR) and fault position is deduced from circuit analysis to pinpoint the fault. Furthermore, a two-stage recovery strategy is proposed for improving reconstruction accuracy of the current vector, where two different sensing matrixes are utilized to improve the incoherence. The proposed method is validated in IEEE 34 node test feeder. Simulation results show asymmetric ground fault type, resistance, fault position and access of distributed generators (DGs) do not significantly influence performance of our method. In addition, it works effectively under various scenarios of noisy measurement and line parameter error. Validations on 134 node test feeders prove the proposed method is also suitable for systems with more complex structure.","PeriodicalId":10729,"journal":{"name":"CSEE Journal of Power and Energy Systems","volume":"10 1","pages":"151-161"},"PeriodicalIF":7.1,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10322703","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139695105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-17DOI: 10.17775/CSEEJPES.2022.04430
Zhi Ding;Tianyao Ji;Mengshi Li;Q. H. Wu
In this paper, a novel signal processing method combining mathematical morphology (MM) and Walsh theory is proposed, which uses Walsh functions to control the structuring element (SE) and MM operators. Based on the Walsh-MM method, a scheme for power quality disturbances detection and classification is developed, which involves three steps: denoising, feature extraction and morphological clustering. First, various evolution rules of Walsh function are used to generate groups of SEs for the multiscale Walsh-ordered morphological operation, so the original signal can be denoised. Next, the fundamental wave of the denoised signal is suppressed by Hadamard matrix; thus, disturbances can be extracted. Finally, the Walsh power spectrum of the waveform extracted in the previous step is calculated, and the parameters of which are taken by morphological clustering to classify the disturbances. Simulation results reveal the proposed scheme can effectively detect and classify disturbances, and the Walsh-MM method is less affected by noise and only involves simple calculation, which has a potential to be implemented in hardware and more suitable for real-time application.
本文提出了一种结合数学形态学 (MM) 和沃尔什理论的新型信号处理方法，该方法使用沃尔什函数来控制结构元素 (SE) 和 MM 算子。基于 Walsh-MM 方法，本文提出了一种电能质量干扰检测和分类方案，包括去噪、特征提取和形态聚类三个步骤。首先，利用沃尔什函数的各种演化规则生成 SE 组，进行多尺度沃尔什有序形态学运算，从而对原始信号进行去噪。接着，利用 Hadamard 矩阵抑制去噪信号的基波，从而提取干扰信号。最后，计算上一步提取的波形的沃尔什功率谱，并通过形态聚类提取其中的参数，对干扰进行分类。仿真结果表明，所提出的方案能有效地检测和分类干扰，而且 Walsh-MM 方法受噪声的影响较小，只需进行简单的计算，有可能在硬件上实现，更适合实时应用。
{"title":"A Hybrid Signal Processing Method Combining Mathematical Morphology and Walsh Theory for Power Quality Disturbance Detection and Classification","authors":"Zhi Ding;Tianyao Ji;Mengshi Li;Q. H. Wu","doi":"10.17775/CSEEJPES.2022.04430","DOIUrl":"https://doi.org/10.17775/CSEEJPES.2022.04430","url":null,"abstract":"In this paper, a novel signal processing method combining mathematical morphology (MM) and Walsh theory is proposed, which uses Walsh functions to control the structuring element (SE) and MM operators. Based on the Walsh-MM method, a scheme for power quality disturbances detection and classification is developed, which involves three steps: denoising, feature extraction and morphological clustering. First, various evolution rules of Walsh function are used to generate groups of SEs for the multiscale Walsh-ordered morphological operation, so the original signal can be denoised. Next, the fundamental wave of the denoised signal is suppressed by Hadamard matrix; thus, disturbances can be extracted. Finally, the Walsh power spectrum of the waveform extracted in the previous step is calculated, and the parameters of which are taken by morphological clustering to classify the disturbances. Simulation results reveal the proposed scheme can effectively detect and classify disturbances, and the Walsh-MM method is less affected by noise and only involves simple calculation, which has a potential to be implemented in hardware and more suitable for real-time application.","PeriodicalId":10729,"journal":{"name":"CSEE Journal of Power and Energy Systems","volume":"10 2","pages":"584-592"},"PeriodicalIF":7.1,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10322711","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140351500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-17DOI: 10.17775/CSEEJPES.2023.03650
Muhammad Junaid;Xiaolong Yu;Shuzhi Cao;Wenqing Yu;Dongsheng Zuo;Jianhua Wang
Environmental issues associated with the aviation industry are getting more attention as air traffic increases. Stringent standards are imposed for fuel consumption and pollution emissions for next-generation aircraft. Superconducting electrical propulsion aircraft (SEPA) have been seen as an efficient way to achieve this goal. High-temperature superconducting (HTS) devices are extensively used in the power system to supply enormous energy. Power is distributed to the different loads via a DC distribution network. However, it will generate an inrush current over ten times higher than the rated current in short-circuit state, which is very harmful to the system. Therefore, it is essential to adopt an appropriate protection scheme. This paper discusses one protection scheme that combines DC vacuum circuit breakers (DC VCB) and resistive superconducting current limiters (RSFCL) for superconducting aircraft applications. Considering problems of cost and loss, the auxiliary capacitor is pre-charged by system voltage, and mechanical elements extinguish the arc. Furthermore, combined with RSFCL, the interrupting environment is fully improved. RSFCL limits fault current, and then the VCB breaks this limited current based on creating an artificial current zero (ACZ). The prospective rated power is 8MW, rated voltage and current are 4 kV and 1 kA, respectively. In this paper, we discuss and simulate switching devices that protect SEPA. The interrupting performance of the circuit breaker is analysed in the DC short-circuit fault that occurs on the transmission line. Finally, the residual energy consumption of different situations is calculated. A comparison is made between using RSFCL with metal oxide varistor (MOV) and just using MOV. The scheme with RSFCL shows a significant advantage in energy consumption.
{"title":"Simulation Analysis of DC Fault Interruption Characteristics of Superconducting Electric Aircraft Propulsion","authors":"Muhammad Junaid;Xiaolong Yu;Shuzhi Cao;Wenqing Yu;Dongsheng Zuo;Jianhua Wang","doi":"10.17775/CSEEJPES.2023.03650","DOIUrl":"https://doi.org/10.17775/CSEEJPES.2023.03650","url":null,"abstract":"Environmental issues associated with the aviation industry are getting more attention as air traffic increases. Stringent standards are imposed for fuel consumption and pollution emissions for next-generation aircraft. Superconducting electrical propulsion aircraft (SEPA) have been seen as an efficient way to achieve this goal. High-temperature superconducting (HTS) devices are extensively used in the power system to supply enormous energy. Power is distributed to the different loads via a DC distribution network. However, it will generate an inrush current over ten times higher than the rated current in short-circuit state, which is very harmful to the system. Therefore, it is essential to adopt an appropriate protection scheme. This paper discusses one protection scheme that combines DC vacuum circuit breakers (DC VCB) and resistive superconducting current limiters (RSFCL) for superconducting aircraft applications. Considering problems of cost and loss, the auxiliary capacitor is pre-charged by system voltage, and mechanical elements extinguish the arc. Furthermore, combined with RSFCL, the interrupting environment is fully improved. RSFCL limits fault current, and then the VCB breaks this limited current based on creating an artificial current zero (ACZ). The prospective rated power is 8MW, rated voltage and current are 4 kV and 1 kA, respectively. In this paper, we discuss and simulate switching devices that protect SEPA. The interrupting performance of the circuit breaker is analysed in the DC short-circuit fault that occurs on the transmission line. Finally, the residual energy consumption of different situations is calculated. A comparison is made between using RSFCL with metal oxide varistor (MOV) and just using MOV. The scheme with RSFCL shows a significant advantage in energy consumption.","PeriodicalId":10729,"journal":{"name":"CSEE Journal of Power and Energy Systems","volume":"10 4","pages":"1834-1842"},"PeriodicalIF":6.9,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10322698","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141966285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-17DOI: 10.17775/CSEEJPES.2022.07170
Yang Liu;Zhongyang Chen;Huanjin Yao;Lin Yi;Q. H. Wu
This paper proposes a critical clearing time (CCT) estimation method by the domain of attraction (DA) of a state-reduction model of power systems using sum of squares (SOS) programming. By exploiting the property of the Jacobian matrix and the structure of the boundary of the DA, it is found the DA of the state-reduction model and that of the full model of a power system are topological isomorphism. There are one-to-one correspondence relationships between the number of equilibrium points, the type of equilibrium points, and solutions of the two system models. Based on these findings, an expanding interior algorithm is proposed with SOS programming to estimate the DA of the state-reduction model. State trajectories of the full model can be transformed to those of the state-reduction model by orthogonal or equiradius projection. In this way, CCT of a grid fault is estimated with the DA of the state-reduction model. The calculational burden of SOS programming in the DA estimation using the state-reduction model is rather small compared with using the full model. Simulation results show the proposed expanding interior algorithm is able to provide a tight estimation of DA of power systems with higher accuracy and lower time costs.
本文通过电力系统状态还原模型的吸引域（DA），利用平方和（SOS）编程法提出了一种临界清除时间（CCT）估算方法。利用雅各布矩阵的性质和吸引域边界的结构，发现状态还原模型的吸引域和电力系统完整模型的吸引域是拓扑同构的。两个系统模型的平衡点数量、平衡点类型和解之间存在一一对应关系。基于这些发现，提出了一种利用 SOS 编程估计状态还原模型 DA 的扩展内部算法。完整模型的状态轨迹可以通过正交或等半径投影转换为状态还原模型的轨迹。这样，网格故障的 CCT 就可以通过状态还原模型的 DA 进行估算。与使用完整模型相比，使用状态还原模型估算 DA 时的 SOS 编程计算负担较小。仿真结果表明，所提出的扩展内部算法能够以更高的精度和更低的时间成本提供电力系统 DA 的精确估算。
{"title":"Estimating Critical Clearing Time of Grid Faults Using DA of State-Reduction Model of Power Systems","authors":"Yang Liu;Zhongyang Chen;Huanjin Yao;Lin Yi;Q. H. Wu","doi":"10.17775/CSEEJPES.2022.07170","DOIUrl":"https://doi.org/10.17775/CSEEJPES.2022.07170","url":null,"abstract":"This paper proposes a critical clearing time (CCT) estimation method by the domain of attraction (DA) of a state-reduction model of power systems using sum of squares (SOS) programming. By exploiting the property of the Jacobian matrix and the structure of the boundary of the DA, it is found the DA of the state-reduction model and that of the full model of a power system are topological isomorphism. There are one-to-one correspondence relationships between the number of equilibrium points, the type of equilibrium points, and solutions of the two system models. Based on these findings, an expanding interior algorithm is proposed with SOS programming to estimate the DA of the state-reduction model. State trajectories of the full model can be transformed to those of the state-reduction model by orthogonal or equiradius projection. In this way, CCT of a grid fault is estimated with the DA of the state-reduction model. The calculational burden of SOS programming in the DA estimation using the state-reduction model is rather small compared with using the full model. Simulation results show the proposed expanding interior algorithm is able to provide a tight estimation of DA of power systems with higher accuracy and lower time costs.","PeriodicalId":10729,"journal":{"name":"CSEE Journal of Power and Energy Systems","volume":"10 2","pages":"807-820"},"PeriodicalIF":7.1,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10322716","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140351490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-17DOI: 10.17775/CSEEJPES.2022.02140
Dan Wang;Deyu Huang;Qing'e Hu;Hongjie Jia;Bo Liu;Yang Lei
With development of integrated energy systems and energy markets, transactive energy has received increasing attention from society and academia, and realization of energy distribution and integrated demand response through market transactions has become a current research hotspot. Research on optimized operation of a distributed energy station as a regional energy supply center is of great significance for improving flexibility and reliability of the system. Based on retail-side energy trading market, this study first establishes a framework of combined electric and heating energy markets and analyses a double auction market mechanism model of interconnected distributed energy stations. This study establishes a mechanism model of energy market participants, and establishes the electric heating combined market-clearing model to maximize global surplus considering multi-energy storage. Finally, in the case study, a typical user energy consumption scenario in winter is selected, showing market-clearing results and demand response effects on a typical day. Impact of transmission line constraints, energy supply equipment capacity, and other factors on clearing results and global surplus are compared and analyzed, verifying the effects of the proposed method on improving global surplus, enhancing interests of market participants and realizing coordination and optimal allocation of both supply and demand resources through energy complementarity between regions.
{"title":"Electricity-Heat-Based Integrated Demand Response Considering Double Auction Energy Market with Multi-Energy Storage for Interconnected Areas","authors":"Dan Wang;Deyu Huang;Qing'e Hu;Hongjie Jia;Bo Liu;Yang Lei","doi":"10.17775/CSEEJPES.2022.02140","DOIUrl":"https://doi.org/10.17775/CSEEJPES.2022.02140","url":null,"abstract":"With development of integrated energy systems and energy markets, transactive energy has received increasing attention from society and academia, and realization of energy distribution and integrated demand response through market transactions has become a current research hotspot. Research on optimized operation of a distributed energy station as a regional energy supply center is of great significance for improving flexibility and reliability of the system. Based on retail-side energy trading market, this study first establishes a framework of combined electric and heating energy markets and analyses a double auction market mechanism model of interconnected distributed energy stations. This study establishes a mechanism model of energy market participants, and establishes the electric heating combined market-clearing model to maximize global surplus considering multi-energy storage. Finally, in the case study, a typical user energy consumption scenario in winter is selected, showing market-clearing results and demand response effects on a typical day. Impact of transmission line constraints, energy supply equipment capacity, and other factors on clearing results and global surplus are compared and analyzed, verifying the effects of the proposed method on improving global surplus, enhancing interests of market participants and realizing coordination and optimal allocation of both supply and demand resources through energy complementarity between regions.","PeriodicalId":10729,"journal":{"name":"CSEE Journal of Power and Energy Systems","volume":"10 4","pages":"1688-1700"},"PeriodicalIF":6.9,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10322708","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141965673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-17DOI: 10.17775/CSEEJPES.2022.06240
Mao Ji;Meng Huang;Haomin Lyu;Sheng Shi;Bo Qi;Chengrong Li
Pressure monitoring of a transformer oil tank can grasp the pressure change process caused by gas production when severe internal defects occur and take timely measures to ensure the safe operation of the transformer. Existing pressure sensors generally use metal encapsulation or have an air cavity structure, threatening the transformer's insulation if it is directly used inside the transformer. To this end, this paper proposes a method for developing a high-sensitivity, large-range, and metallization-free optical pressure sensing device with temperature compensation. Fiber grating is encapsulated by fluorosilicone rubber and supplemented by an epoxy resin shielding shell on the outside. At the same time, a double-grating vertical arrangement is adopted to improve pressure measurement sensitivity, further avoiding the influence of temperature rise caused by a defect of the transformer on the measurement result of the sensor. In addition, by optimizing the geometric structure of the internal sensitizing element, pre-stretching length of the fiber grating, gap distance, and other parameters, probe size can be reduced while ensuring the sensor's performance. Results show the proposed method can meet the requirements of sensor fabrication with different sensitivities and ranges, and to a certain extent, both high sensitivity and extensive ranges can be taken into account. The sensitivity of the fabricated prototype is 15 pm/kPa, and the range is about 0.2 MPa. At the same time, the metal-free feature of the sensor makes it suitable for use in various oil-immersed power equipment. It records oil pressure changes caused by oil discharge breakdown, making it sensitive to small pressure changes in early failures.
{"title":"Metal-Free Optical Pressure Sensor with High Sensitivity and Extensive Range","authors":"Mao Ji;Meng Huang;Haomin Lyu;Sheng Shi;Bo Qi;Chengrong Li","doi":"10.17775/CSEEJPES.2022.06240","DOIUrl":"https://doi.org/10.17775/CSEEJPES.2022.06240","url":null,"abstract":"Pressure monitoring of a transformer oil tank can grasp the pressure change process caused by gas production when severe internal defects occur and take timely measures to ensure the safe operation of the transformer. Existing pressure sensors generally use metal encapsulation or have an air cavity structure, threatening the transformer's insulation if it is directly used inside the transformer. To this end, this paper proposes a method for developing a high-sensitivity, large-range, and metallization-free optical pressure sensing device with temperature compensation. Fiber grating is encapsulated by fluorosilicone rubber and supplemented by an epoxy resin shielding shell on the outside. At the same time, a double-grating vertical arrangement is adopted to improve pressure measurement sensitivity, further avoiding the influence of temperature rise caused by a defect of the transformer on the measurement result of the sensor. In addition, by optimizing the geometric structure of the internal sensitizing element, pre-stretching length of the fiber grating, gap distance, and other parameters, probe size can be reduced while ensuring the sensor's performance. Results show the proposed method can meet the requirements of sensor fabrication with different sensitivities and ranges, and to a certain extent, both high sensitivity and extensive ranges can be taken into account. The sensitivity of the fabricated prototype is 15 pm/kPa, and the range is about 0.2 MPa. At the same time, the metal-free feature of the sensor makes it suitable for use in various oil-immersed power equipment. It records oil pressure changes caused by oil discharge breakdown, making it sensitive to small pressure changes in early failures.","PeriodicalId":10729,"journal":{"name":"CSEE Journal of Power and Energy Systems","volume":"10 3","pages":"1291-1300"},"PeriodicalIF":7.1,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10322696","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141304048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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