The fault characteristics of photovoltaic (PV) DC series arc are scattered in the MHz-level broadband, so extracting the fault characteristic frequency band to enhance the characteristic information is of great significance for the efficient detection of arc faults. In this paper, a Cassie model-based photovoltaic DC series arc fault simulation is first established in PSACD. The output current of the photovoltaic array with two power frequency cycles before and after the fault is used as the signal analysis unit. The combination of mother wavelet and decomposition layer number is optimized by using Tsallis wavelet packet singular entropy (TWPSE). Then, based on the optimal combination, the signal analysis unit is decomposed and reconstructed by wavelet packet, and the Tsallis entropy ratio before and after the fault of each frequency band is calculated to determine the fault characteristic frequency band. Finally, the energy ratio analysis is carried out on the characteristic frequency bands obtained by the optimal and non-optimal combinations, and it is found that the fault characteristic frequency band extracted by the former has the largest energy ratio. The results show that the fault characteristic frequency band extracted by optimal combination can effectively enhance the fault feature, and is more conducive to efficient detection of photovoltaic DC series arc faults.
{"title":"Extraction of Fault Characteristic Frequency Band of Photovoltaic DC Series Arc Based on Wavelet Packet Transform and Tsallis Entropy","authors":"Wenkang Xu, L. Yao, Jinshan Qi, Shiming Tian, Xuemei Zhang, Mingming Pan, Xin Wu","doi":"10.1109/AEEES56888.2023.10114208","DOIUrl":"https://doi.org/10.1109/AEEES56888.2023.10114208","url":null,"abstract":"The fault characteristics of photovoltaic (PV) DC series arc are scattered in the MHz-level broadband, so extracting the fault characteristic frequency band to enhance the characteristic information is of great significance for the efficient detection of arc faults. In this paper, a Cassie model-based photovoltaic DC series arc fault simulation is first established in PSACD. The output current of the photovoltaic array with two power frequency cycles before and after the fault is used as the signal analysis unit. The combination of mother wavelet and decomposition layer number is optimized by using Tsallis wavelet packet singular entropy (TWPSE). Then, based on the optimal combination, the signal analysis unit is decomposed and reconstructed by wavelet packet, and the Tsallis entropy ratio before and after the fault of each frequency band is calculated to determine the fault characteristic frequency band. Finally, the energy ratio analysis is carried out on the characteristic frequency bands obtained by the optimal and non-optimal combinations, and it is found that the fault characteristic frequency band extracted by the former has the largest energy ratio. The results show that the fault characteristic frequency band extracted by optimal combination can effectively enhance the fault feature, and is more conducive to efficient detection of photovoltaic DC series arc faults.","PeriodicalId":272114,"journal":{"name":"2023 5th Asia Energy and Electrical Engineering Symposium (AEEES)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128567632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-23DOI: 10.1109/AEEES56888.2023.10114122
Dongzhi Cao, S. Liao, L. Yao, R. Wang, Zhengwen Li, Jiahao Yan, Yaping Li
As an important high -energy -consuming industrial load, electrolytic magnesium can continuously adjust the power in a large range. It is of great significance to thoroughly tap the power regulation potential of electrolytic magnesium industrial load for improving the flexibility of power system and promoting the consumption of renewable energy. The assessment of power regulation potential depends on the construction of accurate load models. Thus, it is urgent to construct a delicate model for the active power characteristic of electrolytic magnesium industry. Based on analyzing the industrial process of electrolytic magnesium, this paper firstly combs the main electric equipment of electrolytic magnesium industry. Then based on the electrical characteristics of the main electric equipment, this paper constructed their external characteristic models of representing the relationship between active power and voltage, and constructed the active power characteristic model of electrolytic magnesium load by superimposing the power of above models. Finally, this paper used the measured PMU data of a magnesium factory to identify the key parameters of the model and verified the effectiveness of the model by comparing the measured active power curve with the model’s output active power curve and calculating the simulation error.
{"title":"Modelling for Active Power Characteristic of Electrolytic Magnesium Industry Based on Industrial Process Analysis","authors":"Dongzhi Cao, S. Liao, L. Yao, R. Wang, Zhengwen Li, Jiahao Yan, Yaping Li","doi":"10.1109/AEEES56888.2023.10114122","DOIUrl":"https://doi.org/10.1109/AEEES56888.2023.10114122","url":null,"abstract":"As an important high -energy -consuming industrial load, electrolytic magnesium can continuously adjust the power in a large range. It is of great significance to thoroughly tap the power regulation potential of electrolytic magnesium industrial load for improving the flexibility of power system and promoting the consumption of renewable energy. The assessment of power regulation potential depends on the construction of accurate load models. Thus, it is urgent to construct a delicate model for the active power characteristic of electrolytic magnesium industry. Based on analyzing the industrial process of electrolytic magnesium, this paper firstly combs the main electric equipment of electrolytic magnesium industry. Then based on the electrical characteristics of the main electric equipment, this paper constructed their external characteristic models of representing the relationship between active power and voltage, and constructed the active power characteristic model of electrolytic magnesium load by superimposing the power of above models. Finally, this paper used the measured PMU data of a magnesium factory to identify the key parameters of the model and verified the effectiveness of the model by comparing the measured active power curve with the model’s output active power curve and calculating the simulation error.","PeriodicalId":272114,"journal":{"name":"2023 5th Asia Energy and Electrical Engineering Symposium (AEEES)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130859432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-23DOI: 10.1109/AEEES56888.2023.10114288
Zizhuang Liu, Haozhe Sun, Yongli Xia, Yao Chen
With the signing of the Paris Agreement and the setting of governmental pledges globally for carbon neutrality, the development of hydrogen energy industry has become more and more rapid both in China and abroad, which also puts forward new requirements and opportunities for power systems and coal chemical industry. Technologies for Power-Hydrogen-Chemical integrated energy systems are evolving aiming to mitigate the challenges due to ever-increasing penetration of renewable generation in power systems, and to realize decarbonization of hard-to-abate coal chemical sector. In this paper, the recent development of Power-Hydrogen-Chemical integrated energy systems is summarized, the basic principles from the perspectives of water electrolysis - power system coupling and green hydrogen - coal chemical coupling are introduced, the key technologies from system integration, coordinated control, operation and maintenance points of view are discussed, an economic analysis based on a case study in Northwest of China is conducted, which demonstrates the feasibility of large-scale Power-Hydrogen-Chemical integrated energy systems in supporting energy transition and sustainable development in China.
{"title":"Technology Development Review and Economic Analysis of Power-Hydrogen-Chemical Integrated Energy Systems","authors":"Zizhuang Liu, Haozhe Sun, Yongli Xia, Yao Chen","doi":"10.1109/AEEES56888.2023.10114288","DOIUrl":"https://doi.org/10.1109/AEEES56888.2023.10114288","url":null,"abstract":"With the signing of the Paris Agreement and the setting of governmental pledges globally for carbon neutrality, the development of hydrogen energy industry has become more and more rapid both in China and abroad, which also puts forward new requirements and opportunities for power systems and coal chemical industry. Technologies for Power-Hydrogen-Chemical integrated energy systems are evolving aiming to mitigate the challenges due to ever-increasing penetration of renewable generation in power systems, and to realize decarbonization of hard-to-abate coal chemical sector. In this paper, the recent development of Power-Hydrogen-Chemical integrated energy systems is summarized, the basic principles from the perspectives of water electrolysis - power system coupling and green hydrogen - coal chemical coupling are introduced, the key technologies from system integration, coordinated control, operation and maintenance points of view are discussed, an economic analysis based on a case study in Northwest of China is conducted, which demonstrates the feasibility of large-scale Power-Hydrogen-Chemical integrated energy systems in supporting energy transition and sustainable development in China.","PeriodicalId":272114,"journal":{"name":"2023 5th Asia Energy and Electrical Engineering Symposium (AEEES)","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131492566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-23DOI: 10.1109/AEEES56888.2023.10114234
F. Peng, Houlei Gao, Weiying Miao, Xinchi Feng, Bin Xu, Yitong Wu
With the characteristics of low loss, low harmonic content and large transmission capacity, voltage source converter based high voltage direct current transmission (VSC-HVDC) has become the focus of the development for large-capacity and long-distance power transmission system connected with offshore wind farms. However, since the power supplies on both sides are controlled, the fault characteristics are changed, and the performance of the traditional distance protection is influenced. Based on the control strategy, the amplitude and phase angle of the equivalent positive and negative sequence impedances at the two sides of the transmission line are analyzed, and the current phasor expressions of the wind farm side and the VSC-HVDC side of the faulted line are derived. Then the adaptability of distance protection using power frequency component (DPPFC) of transmission line for VSC-HVDC-connected offshore wind farm is analyzed under different fault conditions. The results show that the amplitude and phase angle of the equivalent positive and negative sequence impedances of the wind farm and the VSC-HVDC system are affected by the control strategy of the converter and the fault conditions. The DPPFC is not suitable for VSC-HVDC-connected offshore wind farm system. The ability to avoid the effect of fault resistance of the DPPFC at the wind farm side gets worse. The simulation conducted by EMTP-RV verifies the effectiveness of the analysis.
{"title":"Analysis of Fault Characteristics and Distance Protection Adaptability for VSC-HVDC-Connected Offshore Wind Farms","authors":"F. Peng, Houlei Gao, Weiying Miao, Xinchi Feng, Bin Xu, Yitong Wu","doi":"10.1109/AEEES56888.2023.10114234","DOIUrl":"https://doi.org/10.1109/AEEES56888.2023.10114234","url":null,"abstract":"With the characteristics of low loss, low harmonic content and large transmission capacity, voltage source converter based high voltage direct current transmission (VSC-HVDC) has become the focus of the development for large-capacity and long-distance power transmission system connected with offshore wind farms. However, since the power supplies on both sides are controlled, the fault characteristics are changed, and the performance of the traditional distance protection is influenced. Based on the control strategy, the amplitude and phase angle of the equivalent positive and negative sequence impedances at the two sides of the transmission line are analyzed, and the current phasor expressions of the wind farm side and the VSC-HVDC side of the faulted line are derived. Then the adaptability of distance protection using power frequency component (DPPFC) of transmission line for VSC-HVDC-connected offshore wind farm is analyzed under different fault conditions. The results show that the amplitude and phase angle of the equivalent positive and negative sequence impedances of the wind farm and the VSC-HVDC system are affected by the control strategy of the converter and the fault conditions. The DPPFC is not suitable for VSC-HVDC-connected offshore wind farm system. The ability to avoid the effect of fault resistance of the DPPFC at the wind farm side gets worse. The simulation conducted by EMTP-RV verifies the effectiveness of the analysis.","PeriodicalId":272114,"journal":{"name":"2023 5th Asia Energy and Electrical Engineering Symposium (AEEES)","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122492034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-23DOI: 10.1109/AEEES56888.2023.10114306
Zhifan Xu, Huasen Li, Wenyuan Li, Kai Yu
The state of charge (SOC) is a crucial parameter for reflecting the battery's endurance. This study proposes the novel method of lithium-ion battery SOC estimation to ensure the working status of the energy storage system (ESS). Recurrent cerebellar model neural network (RCMNN) and Kalman filter (KF) are both applied for the SOC estimation that recurrent units can capture the dynamic features. The inputs of RCMNN and KF include voltage, current, and temperature for simulating the general situation of ESS. The battery data are collected in the Fujian Special Equipment Inspection and Research Institute. The results show that the accuracy and robustness of the proposed method under different conditions.
{"title":"State of Charge Estimation for Lithium-ion Battery Using Recurrent Cerebellar Model Neural Network with Kalman Filter","authors":"Zhifan Xu, Huasen Li, Wenyuan Li, Kai Yu","doi":"10.1109/AEEES56888.2023.10114306","DOIUrl":"https://doi.org/10.1109/AEEES56888.2023.10114306","url":null,"abstract":"The state of charge (SOC) is a crucial parameter for reflecting the battery's endurance. This study proposes the novel method of lithium-ion battery SOC estimation to ensure the working status of the energy storage system (ESS). Recurrent cerebellar model neural network (RCMNN) and Kalman filter (KF) are both applied for the SOC estimation that recurrent units can capture the dynamic features. The inputs of RCMNN and KF include voltage, current, and temperature for simulating the general situation of ESS. The battery data are collected in the Fujian Special Equipment Inspection and Research Institute. The results show that the accuracy and robustness of the proposed method under different conditions.","PeriodicalId":272114,"journal":{"name":"2023 5th Asia Energy and Electrical Engineering Symposium (AEEES)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121040701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-23DOI: 10.1109/AEEES56888.2023.10114348
Hanchen Ge, Zhongxi Ou, Zhicong Huang
Nowadays, the data-driven approaches to modeling power electronics (PE) systems are mostly based on sequential neural networks (NNs). These approaches may require too much data since the NNs can not generalize across a wide range of inputs. To address this issue, this paper proposes a new data-driven approach to modeling the transient behaviors of DC-DC converters, which is based on fully-connected NNs. The proposed method introduced prior knowledge about linear systems and thus significantly improved the generalization performance. In this method, circuit parameters are first mapped into linear system characteristics by fully-connected NNs, and then the outputs are calculated by the inputs and the system characteristics. Experiment results show that the entire circuit topology with configurable parameter settings and initial conditions can be successfully modeled. Parameter change events are also supported by this approach.
{"title":"A Data-driven Approach with Improved Generalization Performance to Modeling Transient Behaviors of DC-DC Converters","authors":"Hanchen Ge, Zhongxi Ou, Zhicong Huang","doi":"10.1109/AEEES56888.2023.10114348","DOIUrl":"https://doi.org/10.1109/AEEES56888.2023.10114348","url":null,"abstract":"Nowadays, the data-driven approaches to modeling power electronics (PE) systems are mostly based on sequential neural networks (NNs). These approaches may require too much data since the NNs can not generalize across a wide range of inputs. To address this issue, this paper proposes a new data-driven approach to modeling the transient behaviors of DC-DC converters, which is based on fully-connected NNs. The proposed method introduced prior knowledge about linear systems and thus significantly improved the generalization performance. In this method, circuit parameters are first mapped into linear system characteristics by fully-connected NNs, and then the outputs are calculated by the inputs and the system characteristics. Experiment results show that the entire circuit topology with configurable parameter settings and initial conditions can be successfully modeled. Parameter change events are also supported by this approach.","PeriodicalId":272114,"journal":{"name":"2023 5th Asia Energy and Electrical Engineering Symposium (AEEES)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125302404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-23DOI: 10.1109/AEEES56888.2023.10114189
Wenxin Yang, Chuangchuang Tao, Xin Wu, W. Zhuang, Yife Wu, Yi Wu
With the advantages of DC micro-grid becoming increasingly prominent, because the traditional miniature circuit breaker cannot satisfy the requirements of fast breaking, the miniature solid-state circuit breaker has become a good solution. However, the design of miniature solid-state circuit breaker is faced with challenges such as cost, volume, conduction loss, etc. This paper presents a design scheme of DC miniature solid-state circuit breaker and analyzes its working principle. The main circuit uses two parallel SiC MOSFETs as the main devices, reducing the conduction loss. Under fault conditions, the power electronic devices are disconnected at the same time, and the current can be transferred quickly through the buffer absorption branch. The drive circuit and buffer absorption circuit are designed. The simulation model is built in Pspice to analyze the influence of the stray inductance of each branch on the energy generated by turn-off, turn-off speed and turn-off overvoltage. Considering the influence of stray inductance, a prototype of miniature DC solid state circuit breaker is designed. The experimental results show that the circuit breaker can turn off quickly and stably, and the buffer absorption circuit can well suppress the turn-off voltage spike, which verifies the rationality of the design scheme.
{"title":"Design of a DC Miniature Solid-State Circuit Breaker and Impact Analysis of Stray Inductance","authors":"Wenxin Yang, Chuangchuang Tao, Xin Wu, W. Zhuang, Yife Wu, Yi Wu","doi":"10.1109/AEEES56888.2023.10114189","DOIUrl":"https://doi.org/10.1109/AEEES56888.2023.10114189","url":null,"abstract":"With the advantages of DC micro-grid becoming increasingly prominent, because the traditional miniature circuit breaker cannot satisfy the requirements of fast breaking, the miniature solid-state circuit breaker has become a good solution. However, the design of miniature solid-state circuit breaker is faced with challenges such as cost, volume, conduction loss, etc. This paper presents a design scheme of DC miniature solid-state circuit breaker and analyzes its working principle. The main circuit uses two parallel SiC MOSFETs as the main devices, reducing the conduction loss. Under fault conditions, the power electronic devices are disconnected at the same time, and the current can be transferred quickly through the buffer absorption branch. The drive circuit and buffer absorption circuit are designed. The simulation model is built in Pspice to analyze the influence of the stray inductance of each branch on the energy generated by turn-off, turn-off speed and turn-off overvoltage. Considering the influence of stray inductance, a prototype of miniature DC solid state circuit breaker is designed. The experimental results show that the circuit breaker can turn off quickly and stably, and the buffer absorption circuit can well suppress the turn-off voltage spike, which verifies the rationality of the design scheme.","PeriodicalId":272114,"journal":{"name":"2023 5th Asia Energy and Electrical Engineering Symposium (AEEES)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125517922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-23DOI: 10.1109/AEEES56888.2023.10114141
Xipeng Yu, Zhao Wang
Probabilistic safety analysis (PSA) technology has become the mainstream analysis method in the world to support the daily risk management and safety decision-making in nuclear power plants. The technical specifications of a nuclear power plant in China require that the charging pump and the low-pressure safety injection pump available under the condition of cold shutdown need to be arranged in different series. In the process of switching the middle system technical specifications, management optimization was carried out, and the configuration requirements of charging pump and low-pressure safety injection pump in the original technical specifications were cancelled. In this paper, the risk-informed analysis technology is applied to analyze and determine whether the technical requirements related to the events could be optimized. Ensure the safe and stable operation of nuclear power plant.
{"title":"Application of PSA Technology in Safe Operation of Nuclear Power Plant","authors":"Xipeng Yu, Zhao Wang","doi":"10.1109/AEEES56888.2023.10114141","DOIUrl":"https://doi.org/10.1109/AEEES56888.2023.10114141","url":null,"abstract":"Probabilistic safety analysis (PSA) technology has become the mainstream analysis method in the world to support the daily risk management and safety decision-making in nuclear power plants. The technical specifications of a nuclear power plant in China require that the charging pump and the low-pressure safety injection pump available under the condition of cold shutdown need to be arranged in different series. In the process of switching the middle system technical specifications, management optimization was carried out, and the configuration requirements of charging pump and low-pressure safety injection pump in the original technical specifications were cancelled. In this paper, the risk-informed analysis technology is applied to analyze and determine whether the technical requirements related to the events could be optimized. Ensure the safe and stable operation of nuclear power plant.","PeriodicalId":272114,"journal":{"name":"2023 5th Asia Energy and Electrical Engineering Symposium (AEEES)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124037028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-23DOI: 10.1109/AEEES56888.2023.10114233
Yue-Chun Chen, Q. Lu, Shaohua Sun, Yinguo Yang, Yang Liu, Pingping Xie, Y. Zhu, Shuangxi Wu
Considering the problems of restoration grid optimization insufficient and low stability of post disaster restoration in the process of existing power system multi circuit line network reconfiguration, firstly this paper searches for the set of shunt transmission paths to effectively reduce the risk of power flow over-limit in line restoration process, Considering the problem that the close angle of shunt line is too large during grid connection and loop closing, a sensitivity analysis method considering node phase angle is proposed. Based on load importance and sensitivity sequence, combined with line recovery sequence, a load and unit recovery strategy is formulated, Finally, based on the influence factors such as power flow over-limit reduction effect, close angle regulation effect, system operation reliability and recovery process complexity, a comprehensive evaluation method for network reconfiguration considering power flow over-limit is formed. Combining the above evaluation methods, the optimal recovery path set and network recovery strategy are selected to ensure the stability of system operation in the recovery process. The IEEE 39 bus system example discusses the solution to the problem of power flow over-limit and excessive close angle in loop closing and parallel operation, which verifies the necessity of considering power flow over-limit line network reconfiguration and its effectiveness of the comprehensive evaluation method.
{"title":"Research on Comprehensive Evaluation Method of Network Reconfiguration Considering Power Flow Over-limit","authors":"Yue-Chun Chen, Q. Lu, Shaohua Sun, Yinguo Yang, Yang Liu, Pingping Xie, Y. Zhu, Shuangxi Wu","doi":"10.1109/AEEES56888.2023.10114233","DOIUrl":"https://doi.org/10.1109/AEEES56888.2023.10114233","url":null,"abstract":"Considering the problems of restoration grid optimization insufficient and low stability of post disaster restoration in the process of existing power system multi circuit line network reconfiguration, firstly this paper searches for the set of shunt transmission paths to effectively reduce the risk of power flow over-limit in line restoration process, Considering the problem that the close angle of shunt line is too large during grid connection and loop closing, a sensitivity analysis method considering node phase angle is proposed. Based on load importance and sensitivity sequence, combined with line recovery sequence, a load and unit recovery strategy is formulated, Finally, based on the influence factors such as power flow over-limit reduction effect, close angle regulation effect, system operation reliability and recovery process complexity, a comprehensive evaluation method for network reconfiguration considering power flow over-limit is formed. Combining the above evaluation methods, the optimal recovery path set and network recovery strategy are selected to ensure the stability of system operation in the recovery process. The IEEE 39 bus system example discusses the solution to the problem of power flow over-limit and excessive close angle in loop closing and parallel operation, which verifies the necessity of considering power flow over-limit line network reconfiguration and its effectiveness of the comprehensive evaluation method.","PeriodicalId":272114,"journal":{"name":"2023 5th Asia Energy and Electrical Engineering Symposium (AEEES)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126719085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-23DOI: 10.1109/AEEES56888.2023.10114106
Zhang Jie, Zou Junwen, Liu Xueguang, Li Xiaoying
Using nano SiC and Carnauba Wax(CW) to modify RTV anti pollution flashover coating, a super hydrophobic silicone rubber coating with micro nano structure on the surface was prepared by semi curing RTV one-step spray molding method. The hydrophobic characteristics of the coating surface were studied by means of static contact angle and rolling angle test. The self-cleaning, high temperature resistance and wear resistance tests were carried out on the RTV super hydrophobic surface to study its comprehensive surface properties. The results showed that the modified silicone rubber had the best hydrophobic property when the mass ratio of nano SiC to CW was 2:1; When the pH is 1~13, the contact angle is controlled at 150.4 °～154.4 °, and the rolling angle is controlled at 5.4 °～9.5 °; After heat treatment for 120h at 70 ℃, the contact angle and rolling angle are 150.2 ° and 8.9 ° respectively; The modified RTV coating can maintain good super hydrophobic property when the wear distance is within 90 mm.
{"title":"Study on Super Hydrophobic Modification of RTV Anti Pollution Flashover Coatings Doped with Nano-SiC and CW","authors":"Zhang Jie, Zou Junwen, Liu Xueguang, Li Xiaoying","doi":"10.1109/AEEES56888.2023.10114106","DOIUrl":"https://doi.org/10.1109/AEEES56888.2023.10114106","url":null,"abstract":"Using nano SiC and Carnauba Wax(CW) to modify RTV anti pollution flashover coating, a super hydrophobic silicone rubber coating with micro nano structure on the surface was prepared by semi curing RTV one-step spray molding method. The hydrophobic characteristics of the coating surface were studied by means of static contact angle and rolling angle test. The self-cleaning, high temperature resistance and wear resistance tests were carried out on the RTV super hydrophobic surface to study its comprehensive surface properties. The results showed that the modified silicone rubber had the best hydrophobic property when the mass ratio of nano SiC to CW was 2:1; When the pH is 1~13, the contact angle is controlled at 150.4 °～154.4 °, and the rolling angle is controlled at 5.4 °～9.5 °; After heat treatment for 120h at 70 ℃, the contact angle and rolling angle are 150.2 ° and 8.9 ° respectively; The modified RTV coating can maintain good super hydrophobic property when the wear distance is within 90 mm.","PeriodicalId":272114,"journal":{"name":"2023 5th Asia Energy and Electrical Engineering Symposium (AEEES)","volume":"15 12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127518132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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