Pub Date : 2022-11-11DOI: 10.1109/APET56294.2022.10072702
Yajie Chen, Jiafu Jiang, Xuan Qi, Xiu Yang, Hua Gu, Chengze Li
As for the line parameters of distribution network, they are often affected by the aging of the line and the change of the surrounding environment, which makes it difficult or not timely to obtain. Therefore, this paper proposes a model driven topology identification method of distribution network. Firstly, the coarse node admittance matrix is obtained by inverse solving the power flow equation by linear regression method, and modified by the known conditions. Finally, through the second stage of the correction to complete the distribution network line parameters identification. This method is not only applicable to radiate networks, but also to ring networks. The effectiveness of the proposed method is verified by the simulation of IEEE33 node distribution system.
{"title":"A Model-driven Approach to the Identification of Distribution Network Line Parameters","authors":"Yajie Chen, Jiafu Jiang, Xuan Qi, Xiu Yang, Hua Gu, Chengze Li","doi":"10.1109/APET56294.2022.10072702","DOIUrl":"https://doi.org/10.1109/APET56294.2022.10072702","url":null,"abstract":"As for the line parameters of distribution network, they are often affected by the aging of the line and the change of the surrounding environment, which makes it difficult or not timely to obtain. Therefore, this paper proposes a model driven topology identification method of distribution network. Firstly, the coarse node admittance matrix is obtained by inverse solving the power flow equation by linear regression method, and modified by the known conditions. Finally, through the second stage of the correction to complete the distribution network line parameters identification. This method is not only applicable to radiate networks, but also to ring networks. The effectiveness of the proposed method is verified by the simulation of IEEE33 node distribution system.","PeriodicalId":201727,"journal":{"name":"2022 Asia Power and Electrical Technology Conference (APET)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132607696","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 : 2022-11-11DOI: 10.1109/APET56294.2022.10072654
Xuyang Jin, Qian Zhang, Fan Zhang, Hao Yuan, Baorong Zhou
The sub-synchronous oscillation(SSO) triggered by the large-scale access of wind power and power electronics have brought new challenges to the safe and stable operation of power system. When the doubly-fed induction generator(DFIG) is connected to weak grid by series compensation or connected to the multi-infeed DC system, there is a risk of SSO of wind turbines. Therefore, it is urgent to reveal the internal mechanism and propose mitigation strategies. Firstly, this paper introduces the equivalence modeling methods of the DFIG-based wind farm, including controlled source aggregation equivalence method, equivalent parameter equivalence method, single impedance equivalence method considering the collector system, and multi-machine equivalence method. Then, the main research methods of SSO in DFIG-based wind farm connected to complex system are discussed, including eigenvalue analysis method, impedance analysis method, frequency scan method, complex torque coefficient method, and time-domain simulation method. On this basis, the mitigation measures of SSO are summarized, which are divided into power-side mitigation method and grid-side mitigation method. Finally, the future research direction of SSO in DFIG-based wind farm connected to complex system is prospected to provide useful references for the long-distance safe and stable transmission of large-scale DFIG-based wind farms.
{"title":"Research Overview of Sub-synchronous Oscillation in DFIG-Based Wind Farm Connected to Complex System","authors":"Xuyang Jin, Qian Zhang, Fan Zhang, Hao Yuan, Baorong Zhou","doi":"10.1109/APET56294.2022.10072654","DOIUrl":"https://doi.org/10.1109/APET56294.2022.10072654","url":null,"abstract":"The sub-synchronous oscillation(SSO) triggered by the large-scale access of wind power and power electronics have brought new challenges to the safe and stable operation of power system. When the doubly-fed induction generator(DFIG) is connected to weak grid by series compensation or connected to the multi-infeed DC system, there is a risk of SSO of wind turbines. Therefore, it is urgent to reveal the internal mechanism and propose mitigation strategies. Firstly, this paper introduces the equivalence modeling methods of the DFIG-based wind farm, including controlled source aggregation equivalence method, equivalent parameter equivalence method, single impedance equivalence method considering the collector system, and multi-machine equivalence method. Then, the main research methods of SSO in DFIG-based wind farm connected to complex system are discussed, including eigenvalue analysis method, impedance analysis method, frequency scan method, complex torque coefficient method, and time-domain simulation method. On this basis, the mitigation measures of SSO are summarized, which are divided into power-side mitigation method and grid-side mitigation method. Finally, the future research direction of SSO in DFIG-based wind farm connected to complex system is prospected to provide useful references for the long-distance safe and stable transmission of large-scale DFIG-based wind farms.","PeriodicalId":201727,"journal":{"name":"2022 Asia Power and Electrical Technology Conference (APET)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114969113","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}
Frequent occurrence of extreme events caused serious losses to the power system. This paper takes typhoon disasters as an example to establish the optimal planning model of energy storage system (ESS). The proposed model is a scenario-based two-stage stochastic MILP model. Fully considering the uncertainty of failure scenarios under typhoon and load, the first stage is to select the location and capacity of ESS with line hardening strategy under a limited budget; in the second stage, the charging and discharging strategy of ESS is optimized with distribution system operation strategies to minimize system losses and investment costs. The model is tested on a modified IEEE33 system. Results indicates that the combined planning of allocating ESS and hardening lines can significantly improve resilience of distribution system under extreme events.
{"title":"Energy Storage Optimization Planning for Resilience Enhancement under Extreme Events","authors":"Yongliang Li, Qianwen Hu, Yiping Chen, Jia-yang Wang, Biwu Fang, Ruopu Yang","doi":"10.1109/APET56294.2022.10072796","DOIUrl":"https://doi.org/10.1109/APET56294.2022.10072796","url":null,"abstract":"Frequent occurrence of extreme events caused serious losses to the power system. This paper takes typhoon disasters as an example to establish the optimal planning model of energy storage system (ESS). The proposed model is a scenario-based two-stage stochastic MILP model. Fully considering the uncertainty of failure scenarios under typhoon and load, the first stage is to select the location and capacity of ESS with line hardening strategy under a limited budget; in the second stage, the charging and discharging strategy of ESS is optimized with distribution system operation strategies to minimize system losses and investment costs. The model is tested on a modified IEEE33 system. Results indicates that the combined planning of allocating ESS and hardening lines can significantly improve resilience of distribution system under extreme events.","PeriodicalId":201727,"journal":{"name":"2022 Asia Power and Electrical Technology Conference (APET)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128891729","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 : 2022-11-11DOI: 10.1109/APET56294.2022.10073004
Jing Wang, Yun-hua Zhang, Jun Wang, MengYa Zhou
There is a tradeoff between voltage regulation and power sharing in a droop-controlled dc microgrid. To tackle with this issue, this paper investigates the primary control of voltage source converter based dc MG. This paper further proposes an improved secondary control method to guarantee that the total electric load is shared between the sources in a desirable manner. Simulation studies and experimental validation confirms the effectiveness and performance of the proposed secondary control method.
{"title":"A Secondary Control Method for DC Power Systems","authors":"Jing Wang, Yun-hua Zhang, Jun Wang, MengYa Zhou","doi":"10.1109/APET56294.2022.10073004","DOIUrl":"https://doi.org/10.1109/APET56294.2022.10073004","url":null,"abstract":"There is a tradeoff between voltage regulation and power sharing in a droop-controlled dc microgrid. To tackle with this issue, this paper investigates the primary control of voltage source converter based dc MG. This paper further proposes an improved secondary control method to guarantee that the total electric load is shared between the sources in a desirable manner. Simulation studies and experimental validation confirms the effectiveness and performance of the proposed secondary control method.","PeriodicalId":201727,"journal":{"name":"2022 Asia Power and Electrical Technology Conference (APET)","volume":"22 14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128346978","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 : 2022-11-11DOI: 10.1109/APET56294.2022.10073115
Yunlong He, Jierong Zhuang, Zhihong Xu
The contactor under pulse-width-modulation (PWM) closed-loop control will produce high frequency noise in the holding phase. Based on the noise generation mechanism of contactor, a magneto-mechanical-acoustic coupled finite element model is established by considering the influence of magnetostriction, Lorentz force and Maxwell force. It is found that magnetostriction is the main factor causing the vibration of contactor. The simulation value is compared with the measured value to verify the feasibility of the model, which provides a theoretical and computational basis for the noise prediction of the contactor in the holding phase.
{"title":"Research on Holding Noise of Intelligent Contactor","authors":"Yunlong He, Jierong Zhuang, Zhihong Xu","doi":"10.1109/APET56294.2022.10073115","DOIUrl":"https://doi.org/10.1109/APET56294.2022.10073115","url":null,"abstract":"The contactor under pulse-width-modulation (PWM) closed-loop control will produce high frequency noise in the holding phase. Based on the noise generation mechanism of contactor, a magneto-mechanical-acoustic coupled finite element model is established by considering the influence of magnetostriction, Lorentz force and Maxwell force. It is found that magnetostriction is the main factor causing the vibration of contactor. The simulation value is compared with the measured value to verify the feasibility of the model, which provides a theoretical and computational basis for the noise prediction of the contactor in the holding phase.","PeriodicalId":201727,"journal":{"name":"2022 Asia Power and Electrical Technology Conference (APET)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129858257","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 : 2022-11-11DOI: 10.1109/APET56294.2022.10073092
Zhile Xu, Minghao Wen, Zeya Fang
In order to solve a series of problems such as protection refuses to operate and power system stability declines when the DC voltage of the substation is lost, this paper explains the huge harm caused by the loss of DC power in substations firstly, introduces the centralized wide-area protection system of substations and the DC system structure of 110kV substations commonly used in practical engineering. In view of the situation that the protection device and communication equipment lose power due to the loss of DC voltage in the substation, a wide-area backup protection method using channel alarm information to deal with DC voltage loss in substations is proposed. Then, based on the case analysis, the PSCAD/EMTDC simulation platform is used to build a power system model for simulation verification. The results show that the proposed wide-area backup protection method can operate effectively when the substation DC voltage is lost, and improve the ability of the power system to deal with special conditions.
{"title":"Wide-area Backup Protection for Substation DC Voltage Loss","authors":"Zhile Xu, Minghao Wen, Zeya Fang","doi":"10.1109/APET56294.2022.10073092","DOIUrl":"https://doi.org/10.1109/APET56294.2022.10073092","url":null,"abstract":"In order to solve a series of problems such as protection refuses to operate and power system stability declines when the DC voltage of the substation is lost, this paper explains the huge harm caused by the loss of DC power in substations firstly, introduces the centralized wide-area protection system of substations and the DC system structure of 110kV substations commonly used in practical engineering. In view of the situation that the protection device and communication equipment lose power due to the loss of DC voltage in the substation, a wide-area backup protection method using channel alarm information to deal with DC voltage loss in substations is proposed. Then, based on the case analysis, the PSCAD/EMTDC simulation platform is used to build a power system model for simulation verification. The results show that the proposed wide-area backup protection method can operate effectively when the substation DC voltage is lost, and improve the ability of the power system to deal with special conditions.","PeriodicalId":201727,"journal":{"name":"2022 Asia Power and Electrical Technology Conference (APET)","volume":"55 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113935826","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}
For realizing the effective regulation of multiple types of electrical loads, a game theory-based load regulation method is proposed. By using the Yalmip modeling tool, the regulation model including cuttable and transferable loads has been constructed. Then, the regulation strategy with electrical price as an incentive is designed, and the Cplex solver is used to calculate the process of the game. The simulation results show that the load regulation strategy proposed in this paper can effectively reduce the cost expenditure on the load side, improve the supply-demand balance between the grid and the load, and promote the economic and stable operation of the grid.
{"title":"A Game Theory-Based Approach to Time-of-use Electricity Pricing and Controllable Load Regulation","authors":"Huan He, Erzhen Shang, Zhengping Li, Jinming Sun, Duo Wang, Tianyi Zhang, Shunjiang Wang, Xiuyu Zhang","doi":"10.1109/APET56294.2022.10072514","DOIUrl":"https://doi.org/10.1109/APET56294.2022.10072514","url":null,"abstract":"For realizing the effective regulation of multiple types of electrical loads, a game theory-based load regulation method is proposed. By using the Yalmip modeling tool, the regulation model including cuttable and transferable loads has been constructed. Then, the regulation strategy with electrical price as an incentive is designed, and the Cplex solver is used to calculate the process of the game. The simulation results show that the load regulation strategy proposed in this paper can effectively reduce the cost expenditure on the load side, improve the supply-demand balance between the grid and the load, and promote the economic and stable operation of the grid.","PeriodicalId":201727,"journal":{"name":"2022 Asia Power and Electrical Technology Conference (APET)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130047534","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 : 2022-11-11DOI: 10.1109/APET56294.2022.10073321
Xiu Zhou, Tian Tian, Ninghui He, Yunlong Ma, Weifeng Liu, ZhengHua Yan, Yan Luo, Xiuguang Li, H. Ni
Dissolved gas in oil is an important parameter to reflect the operation state of the transformer. By analyzing the volume fraction of different fault characteristic gases, it can effectively judge the fault condition and fault type of transformer, while predicting the content of dissolved gas in transformer oil can make timely warning before further deterioration of the fault to avoid the occurrence of insulation breakdown. Therefore, a prediction model of dissolved gas concentration in transformer oil based on the firefly optimized support vector machine is proposed. In order to overcome the difficulty in parameter selection of traditional random forest model, the firefly algorithm is used to adjust the parameters in RF. The test results show that FA can effectively improve the prediction accuracy of RF, and the FA-RF model has higher prediction accuracy than existing prediction methods, which can better predict the change of gas volume fraction in oil and prevent serious faults.
{"title":"Prediction Method of Dissolved Gas in Transformer Oil Based on Firefly Algorithm - Random Forest","authors":"Xiu Zhou, Tian Tian, Ninghui He, Yunlong Ma, Weifeng Liu, ZhengHua Yan, Yan Luo, Xiuguang Li, H. Ni","doi":"10.1109/APET56294.2022.10073321","DOIUrl":"https://doi.org/10.1109/APET56294.2022.10073321","url":null,"abstract":"Dissolved gas in oil is an important parameter to reflect the operation state of the transformer. By analyzing the volume fraction of different fault characteristic gases, it can effectively judge the fault condition and fault type of transformer, while predicting the content of dissolved gas in transformer oil can make timely warning before further deterioration of the fault to avoid the occurrence of insulation breakdown. Therefore, a prediction model of dissolved gas concentration in transformer oil based on the firefly optimized support vector machine is proposed. In order to overcome the difficulty in parameter selection of traditional random forest model, the firefly algorithm is used to adjust the parameters in RF. The test results show that FA can effectively improve the prediction accuracy of RF, and the FA-RF model has higher prediction accuracy than existing prediction methods, which can better predict the change of gas volume fraction in oil and prevent serious faults.","PeriodicalId":201727,"journal":{"name":"2022 Asia Power and Electrical Technology Conference (APET)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133033544","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}
Multi-energy microgrids can promote the complementary resources of each entity and improve economic efficiency through cooperated operation. However, the efficient collaborative operation faces the problem of maintaining the stability of the coalition, i.e., to make sure that all individuals will not experience economic loss. To address this problem, this paper first introduces a model for the operation of networked multi-energy microgrids. Then a cooperative revenue allocation mechanism based on the asymmetric Nash bargaining method, with net power output as the contribution measure to guarantee the stability of cooperative alliances is proposed. Finally, a numerical test on a 3 multi-energy microgrid systems is conducted to validate the proposed method. The results show that the proposed cooperative revenue allocation mechanism can not only effectively reflect the differences in the contribution degree of each entity within the coalition, but also avoid the problem of overly aggressive allocation compared with the Shapley value-based allocation mechanism.
{"title":"Cooperative Operation and Revenue Allocation Mechanism in Networked Multi-Energy Microgrids","authors":"Chunjuan Zhao, Zhuxiu Wang, Qian Yang, Boyang Chen, Jiameng He, Xiaotian Sun","doi":"10.1109/APET56294.2022.10072703","DOIUrl":"https://doi.org/10.1109/APET56294.2022.10072703","url":null,"abstract":"Multi-energy microgrids can promote the complementary resources of each entity and improve economic efficiency through cooperated operation. However, the efficient collaborative operation faces the problem of maintaining the stability of the coalition, i.e., to make sure that all individuals will not experience economic loss. To address this problem, this paper first introduces a model for the operation of networked multi-energy microgrids. Then a cooperative revenue allocation mechanism based on the asymmetric Nash bargaining method, with net power output as the contribution measure to guarantee the stability of cooperative alliances is proposed. Finally, a numerical test on a 3 multi-energy microgrid systems is conducted to validate the proposed method. The results show that the proposed cooperative revenue allocation mechanism can not only effectively reflect the differences in the contribution degree of each entity within the coalition, but also avoid the problem of overly aggressive allocation compared with the Shapley value-based allocation mechanism.","PeriodicalId":201727,"journal":{"name":"2022 Asia Power and Electrical Technology Conference (APET)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133066894","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 : 2022-11-11DOI: 10.1109/APET56294.2022.10073180
Tengzhao Zhang, Quanzhu Zhang, Yi-qin Lei
Aiming at the borehole coring device in offshore oilfield, the power supply of the dual-phase motor is studied, the advantages and disadvantages of the traditional power supply are compared and analyzed, and a dual-phase motor driving power supply with the most application prospect is developed.
{"title":"Development of Dual Phase Motor Driving Power Supply for Sidewall Coring","authors":"Tengzhao Zhang, Quanzhu Zhang, Yi-qin Lei","doi":"10.1109/APET56294.2022.10073180","DOIUrl":"https://doi.org/10.1109/APET56294.2022.10073180","url":null,"abstract":"Aiming at the borehole coring device in offshore oilfield, the power supply of the dual-phase motor is studied, the advantages and disadvantages of the traditional power supply are compared and analyzed, and a dual-phase motor driving power supply with the most application prospect is developed.","PeriodicalId":201727,"journal":{"name":"2022 Asia Power and Electrical Technology Conference (APET)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130130132","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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