Pub Date : 2024-09-19DOI: 10.17775/CSEEJPES.2023.02580
Tianhao Wen;Yuqing Lin;Yang Liu;Q. H. Wu;Yinsheng Su
Motivated by state estimation and adaptive control of large-scale complex power systems, this paper proposes a cascaded sliding-mode observer for high-order systems with lower-triangular structure and not necessarily in Byrnes-Isidori Normal Form. Key information about the known nonlinear terms of the system is integrated into different blocks of the proposed observer. Under appropriate parameter design rules, the states of the proposed observer will quickly reach and slide on the intersection of sliding surfaces. During this sliding phase, the estimation errors rapidly converge to negligibly small values, determined by a parameter of the observer. Compared with standard high-gain observers and classical high-gain parameter embedded sliding-mode observers, the proposed observer achieves similar estimation error convergence speed with smaller gain coefficients. Moreover, the peaking phenomenon of the proposed observer is less severe. Besides, the structure of the proposed observer is more flexible than that of some well-known cascaded high-gain observers as there is no restriction on the dimension of the blocks of the proposed observer. Simulation studies are carried out on a fifth-order nonlinear system and a 10-machine 48-bus power system to further demonstrate the features of the proposed observer and its application on adaptive transient stability control of wind farms penetrated power systems.
{"title":"Cascaded Sliding-Mode Observer for High-Order Systems with Lower-Triangular Structure","authors":"Tianhao Wen;Yuqing Lin;Yang Liu;Q. H. Wu;Yinsheng Su","doi":"10.17775/CSEEJPES.2023.02580","DOIUrl":"https://doi.org/10.17775/CSEEJPES.2023.02580","url":null,"abstract":"Motivated by state estimation and adaptive control of large-scale complex power systems, this paper proposes a cascaded sliding-mode observer for high-order systems with lower-triangular structure and not necessarily in Byrnes-Isidori Normal Form. Key information about the known nonlinear terms of the system is integrated into different blocks of the proposed observer. Under appropriate parameter design rules, the states of the proposed observer will quickly reach and slide on the intersection of sliding surfaces. During this sliding phase, the estimation errors rapidly converge to negligibly small values, determined by a parameter of the observer. Compared with standard high-gain observers and classical high-gain parameter embedded sliding-mode observers, the proposed observer achieves similar estimation error convergence speed with smaller gain coefficients. Moreover, the peaking phenomenon of the proposed observer is less severe. Besides, the structure of the proposed observer is more flexible than that of some well-known cascaded high-gain observers as there is no restriction on the dimension of the blocks of the proposed observer. Simulation studies are carried out on a fifth-order nonlinear system and a 10-machine 48-bus power system to further demonstrate the features of the proposed observer and its application on adaptive transient stability control of wind farms penetrated power systems.","PeriodicalId":10729,"journal":{"name":"CSEE Journal of Power and Energy Systems","volume":"11 3","pages":"1045-1059"},"PeriodicalIF":6.9,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10684522","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144243767","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 : 2024-09-19DOI: 10.17775/CSEEJPES.2023.04900
Lei Chen;Tianhao Wen;Yuqing Lin;Yang Liu;Q. H. Wu;Chao Hong;Yinsheng Su
Transient voltage stability analysis (TVSA) of power systems is one of the most computationally challenging tasks in dynamic security assessment. To reduce the complexity of TVSA, this paper proposes an improved expanding annular domain (improved EAD) algorithm to estimate the domain of attraction (DA) of power systems containing multiple induction motors (IMs), whose improvements are concerned with relaxing the restriction on critical value and simplifying iteration steps. The proposed algorithm can systematically construct Lyapunov function for lossy power systems with IMs and their slip constraints. First, the extended Lyapunov stability theory and sum of squares (SOS) programming are presented, which are powerful tools to construct Lyapunov function. Second, the internal node model of IM is developed by an analogy with that of a synchronous generator, and a multi-machine power system model by eliminating algebraic variables is derived. Then, an improved EAD algorithm with SOS programming is proposed to estimate the DA for a power system considering the slip constraint of IM. Finally, the superiority of our method is demonstrated on two modified IEEE test cases. Simulation results show that the proposed algorithm can provide a better estimated DA and critical clearing slip for power systems with multiple IMs.
{"title":"Improved EAD Algorithm to Estimate Domains of Attraction of Power Systems Including Induction Motors for Transient Voltage Stability Analysis","authors":"Lei Chen;Tianhao Wen;Yuqing Lin;Yang Liu;Q. H. Wu;Chao Hong;Yinsheng Su","doi":"10.17775/CSEEJPES.2023.04900","DOIUrl":"https://doi.org/10.17775/CSEEJPES.2023.04900","url":null,"abstract":"Transient voltage stability analysis (TVSA) of power systems is one of the most computationally challenging tasks in dynamic security assessment. To reduce the complexity of TVSA, this paper proposes an improved expanding annular domain (improved EAD) algorithm to estimate the domain of attraction (DA) of power systems containing multiple induction motors (IMs), whose improvements are concerned with relaxing the restriction on critical value and simplifying iteration steps. The proposed algorithm can systematically construct Lyapunov function for lossy power systems with IMs and their slip constraints. First, the extended Lyapunov stability theory and sum of squares (SOS) programming are presented, which are powerful tools to construct Lyapunov function. Second, the internal node model of IM is developed by an analogy with that of a synchronous generator, and a multi-machine power system model by eliminating algebraic variables is derived. Then, an improved EAD algorithm with SOS programming is proposed to estimate the DA for a power system considering the slip constraint of IM. Finally, the superiority of our method is demonstrated on two modified IEEE test cases. Simulation results show that the proposed algorithm can provide a better estimated DA and critical clearing slip for power systems with multiple IMs.","PeriodicalId":10729,"journal":{"name":"CSEE Journal of Power and Energy Systems","volume":"10 6","pages":"2321-2332"},"PeriodicalIF":6.9,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10684526","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142859064","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}
Switched-capacitor/flying capacitor (FC) based multilevel converters have been gaining higher attention for their voltage-boosting ability. This feature makes them an attractive solution for renewable energy systems, such as low-voltage input photovoltaic power systems and electric vehicle systems. However, they usually require more high voltage rating switches and flying capacitors along with boosting capability. Furthermore, they suffer from high pulse currents at the switching transients. Aiming to solve these issues, this article proposes a new self-balancing three-phase five-level inverter based on the switched-capacitor (5L-SCTPNPC), which reduces the dc voltage requirement. The number of active switches is relatively smaller and seven active switches are required per phase. Especially, a soft-charging circuit for FC is designed to limit the impulse charging current. Compared to conventional multilevel inverters, the proposed five-level inverter reduces dc bus voltage by 50%. Significantly, the voltage stress of FC and the switches in parallel with FC are all reduced by 50% in comparison with some existing similar boosting five-level active-neutral-point-clamped (5L-BANPC) inverters. The operating principles, modulation strategy, and the design of the FC and charging inductor are provided in detailly. A comprehensive comparison study has been made to highlight the merits of the proposed inverter. Finally, the simulations and experiments validate the feasibility of the proposed topology.
{"title":"Self-Balancing Three-Phase Five-Level Inverter with Reduced DC Bus Voltage","authors":"Wenyuan Zhang;Hongliang Wang;Xiaonan Zhu;Hanzhe Wang;Xiaojun Deng;Xiumei Yue","doi":"10.17775/CSEEJPES.2023.03490","DOIUrl":"https://doi.org/10.17775/CSEEJPES.2023.03490","url":null,"abstract":"Switched-capacitor/flying capacitor (FC) based multilevel converters have been gaining higher attention for their voltage-boosting ability. This feature makes them an attractive solution for renewable energy systems, such as low-voltage input photovoltaic power systems and electric vehicle systems. However, they usually require more high voltage rating switches and flying capacitors along with boosting capability. Furthermore, they suffer from high pulse currents at the switching transients. Aiming to solve these issues, this article proposes a new self-balancing three-phase five-level inverter based on the switched-capacitor (5L-SCTPNPC), which reduces the dc voltage requirement. The number of active switches is relatively smaller and seven active switches are required per phase. Especially, a soft-charging circuit for FC is designed to limit the impulse charging current. Compared to conventional multilevel inverters, the proposed five-level inverter reduces dc bus voltage by 50%. Significantly, the voltage stress of FC and the switches in parallel with FC are all reduced by 50% in comparison with some existing similar boosting five-level active-neutral-point-clamped (5L-BANPC) inverters. The operating principles, modulation strategy, and the design of the FC and charging inductor are provided in detailly. A comprehensive comparison study has been made to highlight the merits of the proposed inverter. Finally, the simulations and experiments validate the feasibility of the proposed topology.","PeriodicalId":10729,"journal":{"name":"CSEE Journal of Power and Energy Systems","volume":"12 1","pages":"377-389"},"PeriodicalIF":5.9,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10684469","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146147713","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 : 2024-09-19DOI: 10.17775/CSEEJPES.2024.00600
Hong Lu;Xianyong Xiao;Guangfu Tang;Zhiyuan He;Zhiguang Lin;Chong Gao;Zixuan Zheng
The participation of photovoltaic (PV) plants in supporting the transient voltage caused by commutation failure in the line-commutated-converter-based high voltage direct current (LCC-HVDC) system is of great significance, as it can enhance the DC transmission ability. However, it is found that the grid-following (GFL) PV converters face the problem of mismatch between reactive power response and transient voltage characteristic when the voltage converts from low voltage to overvoltage, further aggravating the overvoltage amplitude. Thus, this article proposes a transient voltage support strategy based on the grid-forming (GFM) medium voltage PV converter. The proposed strategy takes the advantage of the close equivalent electrical distance between the converter and grid, which can autonomously control the converter terminal voltage through GFM control with adaptive voltage droop coefficient. The simulation results show that the proposed strategy can ensure the output reactive power of the PV converter quickly matches the transient voltage characteristic at different stages, indicating that the proposed strategy can effectively support the transient voltage.
{"title":"Transient Voltage Support Strategy of Grid-Forming Medium Voltage Photovoltaic Converter in the LCC-HVDC System","authors":"Hong Lu;Xianyong Xiao;Guangfu Tang;Zhiyuan He;Zhiguang Lin;Chong Gao;Zixuan Zheng","doi":"10.17775/CSEEJPES.2024.00600","DOIUrl":"https://doi.org/10.17775/CSEEJPES.2024.00600","url":null,"abstract":"The participation of photovoltaic (PV) plants in supporting the transient voltage caused by commutation failure in the line-commutated-converter-based high voltage direct current (LCC-HVDC) system is of great significance, as it can enhance the DC transmission ability. However, it is found that the grid-following (GFL) PV converters face the problem of mismatch between reactive power response and transient voltage characteristic when the voltage converts from low voltage to overvoltage, further aggravating the overvoltage amplitude. Thus, this article proposes a transient voltage support strategy based on the grid-forming (GFM) medium voltage PV converter. The proposed strategy takes the advantage of the close equivalent electrical distance between the converter and grid, which can autonomously control the converter terminal voltage through GFM control with adaptive voltage droop coefficient. The simulation results show that the proposed strategy can ensure the output reactive power of the PV converter quickly matches the transient voltage characteristic at different stages, indicating that the proposed strategy can effectively support the transient voltage.","PeriodicalId":10729,"journal":{"name":"CSEE Journal of Power and Energy Systems","volume":"10 5","pages":"1849-1864"},"PeriodicalIF":6.9,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10684468","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142397515","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 : 2024-07-24DOI: 10.17775/CSEEJPES.2024.00370
Jing Li;Boyang Zhao;Shenquan Liu;Jie Li;Xiuli Wang;Xifan Wang
The fractional frequency transmission system is an emerging technology for long-distance wind power integration, and the modular multilevel matrix converter (M3C) is the keen equipment. Since the M3C directly connects two ac grids with different frequencies, the external and internal harmonics have complex coupling relationships with a unique dual-fundamental-frequency spectrum, which has not been properly investigated due to a lack of an effective method. To address this issue, a novel harmonic state-space method is proposed to achieve comprehensive modelling of the harmonic dynamics of the M3C. Based on the principle of two-dimensional Fourier transform, the decomposition of the dual-fundamental-frequency harmonics is realized, and the multiplicative coupling between time-domain variables is modelled through double-layer convolution on the frequency domain. Besides, the general expression of the proposed method is provided, which highlights a modularized matrix with easy scalability to meet different truncation requirements. Then, the HSS model of M3C considering the close-loop control is established, based on which a panoramic harmonic coupling relationship between the system- and the low-frequency side is concluded. Finally, the M3C model and harmonic coupling relationship are validated by simulation tests conducted in MATLAB/Simulink environment.
{"title":"A Novel Harmonic State-space Modelling Method on the Modular Multilevel Matrix Converter and Coupling Analysis","authors":"Jing Li;Boyang Zhao;Shenquan Liu;Jie Li;Xiuli Wang;Xifan Wang","doi":"10.17775/CSEEJPES.2024.00370","DOIUrl":"https://doi.org/10.17775/CSEEJPES.2024.00370","url":null,"abstract":"The fractional frequency transmission system is an emerging technology for long-distance wind power integration, and the modular multilevel matrix converter (M<sup>3</sup>C) is the keen equipment. Since the M<sup>3</sup>C directly connects two ac grids with different frequencies, the external and internal harmonics have complex coupling relationships with a unique dual-fundamental-frequency spectrum, which has not been properly investigated due to a lack of an effective method. To address this issue, a novel harmonic state-space method is proposed to achieve comprehensive modelling of the harmonic dynamics of the M<sup>3</sup>C. Based on the principle of two-dimensional Fourier transform, the decomposition of the dual-fundamental-frequency harmonics is realized, and the multiplicative coupling between time-domain variables is modelled through double-layer convolution on the frequency domain. Besides, the general expression of the proposed method is provided, which highlights a modularized matrix with easy scalability to meet different truncation requirements. Then, the HSS model of M<sup>3</sup>C considering the close-loop control is established, based on which a panoramic harmonic coupling relationship between the system- and the low-frequency side is concluded. Finally, the M<sup>3</sup>C model and harmonic coupling relationship are validated by simulation tests conducted in MATLAB/Simulink environment.","PeriodicalId":10729,"journal":{"name":"CSEE Journal of Power and Energy Systems","volume":"11 1","pages":"78-90"},"PeriodicalIF":6.9,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10609297","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143430451","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 : 2024-07-24DOI: 10.17775/CSEEJPES.2023.00840
Xuan Sheng;Shunjiang Lin;Weikun Liang;Yue Pan;Mingbo Liu
Demand response (DR) is considered to be an effective way to bring significant economic benefit to the commercial campus integrated energy system (CCIES) due to the large amount of flexible cooling and electric vehicle (EV) charging loads. To maximize DR's benefits, this paper proposes an integrated DR framework that includes direct load control for cooling loads and time-of-use for EV charging station load in the CCIES. Moreover, multiple uncertainties threaten the secure and economic operation of the CCIES. To deal with these challenges, this paper establishes an interval optimization (IO) based economic dispatch (ED) model, considering the uncertain parameters, including ambient temperature, DR parameters, pipeline parameters, and maximum available PV power output. To improve the solution efficiency, the nonlinear constraints are linearized by applying multi-layer perceptron and affine arithmetic. The order relation and the possibility degrees of intervals are used to transform the interval ED model into a bi-level optimization model. The extreme value theorem of linear interval functions is used to obtain the analytical expressions of the optimal solutions of inner-level models, and the ED model is finally transformed into a solvable mix-integer linear programming model. Test results from actual CCIES demonstrate that the DR can improve the economy and reduce the uncertain fluctuation range of both the objective function and state variables. The ED result can maintain an economical and secure operation under multiple uncertain fluctuations.
{"title":"Interval Economic Dispatch for Commercial Campus Integrated Energy System with Demand Response Considering Multiple Uncertainties","authors":"Xuan Sheng;Shunjiang Lin;Weikun Liang;Yue Pan;Mingbo Liu","doi":"10.17775/CSEEJPES.2023.00840","DOIUrl":"https://doi.org/10.17775/CSEEJPES.2023.00840","url":null,"abstract":"Demand response (DR) is considered to be an effective way to bring significant economic benefit to the commercial campus integrated energy system (CCIES) due to the large amount of flexible cooling and electric vehicle (EV) charging loads. To maximize DR's benefits, this paper proposes an integrated DR framework that includes direct load control for cooling loads and time-of-use for EV charging station load in the CCIES. Moreover, multiple uncertainties threaten the secure and economic operation of the CCIES. To deal with these challenges, this paper establishes an interval optimization (IO) based economic dispatch (ED) model, considering the uncertain parameters, including ambient temperature, DR parameters, pipeline parameters, and maximum available PV power output. To improve the solution efficiency, the nonlinear constraints are linearized by applying multi-layer perceptron and affine arithmetic. The order relation and the possibility degrees of intervals are used to transform the interval ED model into a bi-level optimization model. The extreme value theorem of linear interval functions is used to obtain the analytical expressions of the optimal solutions of inner-level models, and the ED model is finally transformed into a solvable mix-integer linear programming model. Test results from actual CCIES demonstrate that the DR can improve the economy and reduce the uncertain fluctuation range of both the objective function and state variables. The ED result can maintain an economical and secure operation under multiple uncertain fluctuations.","PeriodicalId":10729,"journal":{"name":"CSEE Journal of Power and Energy Systems","volume":"11 3","pages":"1297-1311"},"PeriodicalIF":6.9,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10609274","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144243863","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 : 2024-07-24DOI: 10.17775/CSEEJPES.2023.07350
Haijin Liu;Weijie Wen;Rui Lyu;He Yang;Jiawei He;Botong Li;Bin Li
As key equipment in medium voltage DC (MVDC) systems, modular multilevel AC/DC and DC/DC converters (MM-AC/DC, MM-DC/DC) have drawn marvelous attractions. However, research on DC fault ride-through focuses on MM-AC/DC, and the fault current elimination for MM-DC/DC remains a research gap, which limits the wide application of the MVDC system. To fulfil this research gap, the contribution of this paper is revealing the fault current characteristics of MM-DC/DC based on half-bridge and full-bridge submodules (HBSM and FBSM) and proposing a novel MM-DC/DC based on hybrid HBSM and thyristor-diode module (TDM). By integrating TDM in the upper bridge arm of one phase and the down bridge arm of the other phase in MM-DC/DC, the MM-DC/DC achieves self-elimination of fault currents. The basic concept is using the energy at the healthy side to modulate a reverse voltage source (RVS) at the faulty side of MM-DC/DC, forcing fault current through TDM pass across zero. TDM can extinguish the resulting fault current. The parameter design and control strategy of the novel MM-DC/DC are discussed. Simulation is carried out for verification, and the results show that fault current can be eliminated within several milliseconds without causing excessive operating losses and costs.
{"title":"Fault Current Elimination for Modular Multilevel DC/DC Converter Based on Hybrid HBSM and TDM","authors":"Haijin Liu;Weijie Wen;Rui Lyu;He Yang;Jiawei He;Botong Li;Bin Li","doi":"10.17775/CSEEJPES.2023.07350","DOIUrl":"https://doi.org/10.17775/CSEEJPES.2023.07350","url":null,"abstract":"As key equipment in medium voltage DC (MVDC) systems, modular multilevel AC/DC and DC/DC converters (MM-AC/DC, MM-DC/DC) have drawn marvelous attractions. However, research on DC fault ride-through focuses on MM-AC/DC, and the fault current elimination for MM-DC/DC remains a research gap, which limits the wide application of the MVDC system. To fulfil this research gap, the contribution of this paper is revealing the fault current characteristics of MM-DC/DC based on half-bridge and full-bridge submodules (HBSM and FBSM) and proposing a novel MM-DC/DC based on hybrid HBSM and thyristor-diode module (TDM). By integrating TDM in the upper bridge arm of one phase and the down bridge arm of the other phase in MM-DC/DC, the MM-DC/DC achieves self-elimination of fault currents. The basic concept is using the energy at the healthy side to modulate a reverse voltage source (RVS) at the faulty side of MM-DC/DC, forcing fault current through TDM pass across zero. TDM can extinguish the resulting fault current. The parameter design and control strategy of the novel MM-DC/DC are discussed. Simulation is carried out for verification, and the results show that fault current can be eliminated within several milliseconds without causing excessive operating losses and costs.","PeriodicalId":10729,"journal":{"name":"CSEE Journal of Power and Energy Systems","volume":"12 1","pages":"534-546"},"PeriodicalIF":5.9,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10609311","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146147682","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 : 2024-07-24DOI: 10.17775/CSEEJPES.2023.08830
Huayi Wu;Zhao Xu;Jiaqi Ruan;Xianzhuo Sun
A centralized framework-based data-driven framework for active distribution system state estimation (DSSE) has been widely leveraged. However, it is challenged by potential data privacy breaches due to the aggregation of raw measurement data in a data center. A personalized federated learning-based DSSE method (PFL-DSSE) is proposed in a decentralized training framework for DSSE. Experimental validation confirms that PFL-DSSE can effectively and efficiently maintain data confidentiality and enhance estimation accuracy.
{"title":"PFL-DSSE: A Personalized Federated Learning Approach for Distribution System State Estimation","authors":"Huayi Wu;Zhao Xu;Jiaqi Ruan;Xianzhuo Sun","doi":"10.17775/CSEEJPES.2023.08830","DOIUrl":"https://doi.org/10.17775/CSEEJPES.2023.08830","url":null,"abstract":"A centralized framework-based data-driven framework for active distribution system state estimation (DSSE) has been widely leveraged. However, it is challenged by potential data privacy breaches due to the aggregation of raw measurement data in a data center. A personalized federated learning-based DSSE method (PFL-DSSE) is proposed in a decentralized training framework for DSSE. Experimental validation confirms that PFL-DSSE can effectively and efficiently maintain data confidentiality and enhance estimation accuracy.","PeriodicalId":10729,"journal":{"name":"CSEE Journal of Power and Energy Systems","volume":"10 5","pages":"2265-2270"},"PeriodicalIF":6.9,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10609318","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142408766","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 : 2024-07-24DOI: 10.17775/CSEEJPES.2022.08680
Peinan Fan;Yixun Xue;Haotian Zhao;Xinyue Chang;Jia Su;Ke Wang;Hongbin Sun
Large-scale renewable energy penetration desires higher flexibility in the power system. Combined heat and power virtual power plants (CUP-VPPs) provide an economic-effective method to improve the power system flexibility by aggregating the distributed resources of an electric-thermal coupling system. The topology can be optimally reconfigured in a power distribution system by operating tie and segment switches. Similarly, the heat flow profile can be redistributed in the district heating system (DHS) with valve switching and provide notable flexibility for CHP-VPPs self-scheduling. To address this issue, an aggregation model for the CHP-VPP is proposed to trade in typical day-ahead energy and reserve electricity markets, which is formulated as an adjustable robust optimization (ARO) problem to assure the realizability of all dispatch requests. The energy flow model is introduced in DHS formulation to make the model solvable. Due to the binary switching variables in the second stage of the proposed ARO problem, classical Karush-Kuhn-Tucker-based algorithms cannot be adopted directly and a nested column-and-constraint generation solution strategy is proposed. Case studies based on an actual CHP-VPP certify the validity of the proposed model and algorithm.
{"title":"Enhancing Flexibility of Virtual Power Plants Considering Reconfiguration of District Heating Network","authors":"Peinan Fan;Yixun Xue;Haotian Zhao;Xinyue Chang;Jia Su;Ke Wang;Hongbin Sun","doi":"10.17775/CSEEJPES.2022.08680","DOIUrl":"https://doi.org/10.17775/CSEEJPES.2022.08680","url":null,"abstract":"Large-scale renewable energy penetration desires higher flexibility in the power system. Combined heat and power virtual power plants (CUP-VPPs) provide an economic-effective method to improve the power system flexibility by aggregating the distributed resources of an electric-thermal coupling system. The topology can be optimally reconfigured in a power distribution system by operating tie and segment switches. Similarly, the heat flow profile can be redistributed in the district heating system (DHS) with valve switching and provide notable flexibility for CHP-VPPs self-scheduling. To address this issue, an aggregation model for the CHP-VPP is proposed to trade in typical day-ahead energy and reserve electricity markets, which is formulated as an adjustable robust optimization (ARO) problem to assure the realizability of all dispatch requests. The energy flow model is introduced in DHS formulation to make the model solvable. Due to the binary switching variables in the second stage of the proposed ARO problem, classical Karush-Kuhn-Tucker-based algorithms cannot be adopted directly and a nested column-and-constraint generation solution strategy is proposed. Case studies based on an actual CHP-VPP certify the validity of the proposed model and algorithm.","PeriodicalId":10729,"journal":{"name":"CSEE Journal of Power and Energy Systems","volume":"11 2","pages":"826-837"},"PeriodicalIF":6.9,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10609312","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143856273","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 : 2024-03-03DOI: 10.17775/CSEEJPES.2022.08260
Wanning Zheng;Jiabing Hu;Li Chai;Bing Liu;Zixia Sang
The small-signal stability of multi-terminal high voltage direct current (HVDC) systems has become one of the vital issues in modern power systems. Interactions among voltage source converters (VSCs) have a significant impact on the stability of the system. This paper proposes an interaction quantification method based on the self-/en-stabilizing coefficients of the general $boldsymbol{N}-mathbf{terminal}$ HVDC system with a weak AC network connection. First, we derive the explicit formulae of self-/en-stabilizing coefficients for any $boldsymbol{N}-mathbf{terminal}$ HVDC system, which can quantify the interactions through different paths analytically. The relation between the self-/en-stabilizing coefficients and the poles of the system can be used to evaluate the impact of the interactions on the system stability effectively. Then, we employ the obtained formulae to analyze the parameter sensitivity and explain how a parameter affects the stability of the system through different paths of interactions. Finally, extensive examples are given to demonstrate the effectiveness of the proposed method.
{"title":"Interaction Quantification of MTDC Systems Connected with Weak AC Grids","authors":"Wanning Zheng;Jiabing Hu;Li Chai;Bing Liu;Zixia Sang","doi":"10.17775/CSEEJPES.2022.08260","DOIUrl":"https://doi.org/10.17775/CSEEJPES.2022.08260","url":null,"abstract":"The small-signal stability of multi-terminal high voltage direct current (HVDC) systems has become one of the vital issues in modern power systems. Interactions among voltage source converters (VSCs) have a significant impact on the stability of the system. This paper proposes an interaction quantification method based on the self-/en-stabilizing coefficients of the general \u0000<tex>$boldsymbol{N}-mathbf{terminal}$</tex>\u0000 HVDC system with a weak AC network connection. First, we derive the explicit formulae of self-/en-stabilizing coefficients for any \u0000<tex>$boldsymbol{N}-mathbf{terminal}$</tex>\u0000 HVDC system, which can quantify the interactions through different paths analytically. The relation between the self-/en-stabilizing coefficients and the poles of the system can be used to evaluate the impact of the interactions on the system stability effectively. Then, we employ the obtained formulae to analyze the parameter sensitivity and explain how a parameter affects the stability of the system through different paths of interactions. Finally, extensive examples are given to demonstrate the effectiveness of the proposed method.","PeriodicalId":10729,"journal":{"name":"CSEE Journal of Power and Energy Systems","volume":"10 5","pages":"2088-2099"},"PeriodicalIF":6.9,"publicationDate":"2024-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10520204","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142397361","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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