Pub Date : 2015-07-05DOI: 10.13335/J.1000-3673.PST.2015.07.023
Shen Xinwei, Zhu Shouzhen, Zheng Jinghong, Han Yingduo, L. Qingsheng, Nong Jing
{"title":"Active Distribution Network Planning-Operation Co-optimization Considering the Coordination of ESS and DG","authors":"Shen Xinwei, Zhu Shouzhen, Zheng Jinghong, Han Yingduo, L. Qingsheng, Nong Jing","doi":"10.13335/J.1000-3673.PST.2015.07.023","DOIUrl":"https://doi.org/10.13335/J.1000-3673.PST.2015.07.023","url":null,"abstract":"","PeriodicalId":20420,"journal":{"name":"Power system technology","volume":"39 1","pages":"1913-1920"},"PeriodicalIF":0.0,"publicationDate":"2015-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66320357","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 : 2015-03-05DOI: 10.13335/j.1000-3673.pst.2015.03.017
Fu Xiazhou, Xu Zheng, Yi Xiaoran
{"title":"Calculation of Main Circuit Steady State Parameters for MTDC Transmission System","authors":"Fu Xiazhou, Xu Zheng, Yi Xiaoran","doi":"10.13335/j.1000-3673.pst.2015.03.017","DOIUrl":"https://doi.org/10.13335/j.1000-3673.pst.2015.03.017","url":null,"abstract":"","PeriodicalId":20420,"journal":{"name":"Power system technology","volume":"39 1","pages":"698-704"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66320347","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 : 2015-03-05DOI: 10.13335/J.1000-3673.PST.2015.03.001
Ye Xiaohui, Liu Tao, Song Xinli, Zhong Wuzhi, Wu Guoyang, Q. Linan, Sun Zhida, Hu Yongning
As the large-scale integration of photovoltaic(PV) power station, a higher requirement is put forward by power grid analysis on the accuracy of PV station model. The PV station applies different strategies with/without scheduling instructions, or under normal/failure condition, so it has different characteristics in multi-time scale. In order to study its dynamic characteristics, an active power control model of PV power station suitable for full dynamic simulation was proposed, which could simulate the active power fluctuations of PV power station using light intensity/temperature and schedule command curves, by building station AGC control model and inverter control model. The proposed model was realized in PSD-FDS program and verified using measured data from Ningxia grid. The simulation results show that the proposed PV power station model could provide effective tool for analyzing the PV power station's dynamic characteristic.
{"title":"An Active Power Control Model of PV Power Station Suitable for Full Dynamic Simulation","authors":"Ye Xiaohui, Liu Tao, Song Xinli, Zhong Wuzhi, Wu Guoyang, Q. Linan, Sun Zhida, Hu Yongning","doi":"10.13335/J.1000-3673.PST.2015.03.001","DOIUrl":"https://doi.org/10.13335/J.1000-3673.PST.2015.03.001","url":null,"abstract":"As the large-scale integration of photovoltaic(PV) power station, a higher requirement is put forward by power grid analysis on the accuracy of PV station model. The PV station applies different strategies with/without scheduling instructions, or under normal/failure condition, so it has different characteristics in multi-time scale. In order to study its dynamic characteristics, an active power control model of PV power station suitable for full dynamic simulation was proposed, which could simulate the active power fluctuations of PV power station using light intensity/temperature and schedule command curves, by building station AGC control model and inverter control model. The proposed model was realized in PSD-FDS program and verified using measured data from Ningxia grid. The simulation results show that the proposed PV power station model could provide effective tool for analyzing the PV power station's dynamic characteristic.","PeriodicalId":20420,"journal":{"name":"Power system technology","volume":"36 1","pages":"587-593"},"PeriodicalIF":0.0,"publicationDate":"2015-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66320285","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 : 2015-02-05DOI: 10.13335/J.1000-3673.PST.2015.02.004
Xie Shao-jun, Ji Lin, Xu Jinming
The performance of grid-connected inverter is closely related to the grid impedance in distributed power generation systems. However, the grid impedance usually varies with the change of the grid operation condition.Therefore, accurate grid impedance estimation is one of the key technologies to achieve the high performance adaptive control of the inverter which connects to a weak grid. Recently, many literatures proposed and studied the methods for grid impedance measurements. However, the merits and demerits of different methods have not been discussed deeply. For this reason, this paper presents a review of the various methods for grid impedance measurement. The existing methods are classified into three main categories: active methods, passive methods and quasi-passive methods. Moreover, the characteristics of these methods are investigated, and the merits and demerits and suitable application of each method are also discussed. At last, some issues to be solved are pointed out.
{"title":"Review of Grid Impedance Estimation for Gird-Connected Inverter","authors":"Xie Shao-jun, Ji Lin, Xu Jinming","doi":"10.13335/J.1000-3673.PST.2015.02.004","DOIUrl":"https://doi.org/10.13335/J.1000-3673.PST.2015.02.004","url":null,"abstract":"The performance of grid-connected inverter is closely related to the grid impedance in distributed power generation systems. However, the grid impedance usually varies with the change of the grid operation condition.Therefore, accurate grid impedance estimation is one of the key technologies to achieve the high performance adaptive control of the inverter which connects to a weak grid. Recently, many literatures proposed and studied the methods for grid impedance measurements. However, the merits and demerits of different methods have not been discussed deeply. For this reason, this paper presents a review of the various methods for grid impedance measurement. The existing methods are classified into three main categories: active methods, passive methods and quasi-passive methods. Moreover, the characteristics of these methods are investigated, and the merits and demerits and suitable application of each method are also discussed. At last, some issues to be solved are pointed out.","PeriodicalId":20420,"journal":{"name":"Power system technology","volume":"39 1","pages":"320-326"},"PeriodicalIF":0.0,"publicationDate":"2015-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66320720","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 : 2015-02-05DOI: 10.13335/J.1000-3673.PST.2015.02.014
Zhou You-bin, Quan Jiang-tao, Wen Xishan, Zhang Lu, Tong Xin, Pan Zhuohong
{"title":"Modeling of Distributed Grounding Electrodes for HVDC Power Transmission System and Its Application","authors":"Zhou You-bin, Quan Jiang-tao, Wen Xishan, Zhang Lu, Tong Xin, Pan Zhuohong","doi":"10.13335/J.1000-3673.PST.2015.02.014","DOIUrl":"https://doi.org/10.13335/J.1000-3673.PST.2015.02.014","url":null,"abstract":"","PeriodicalId":20420,"journal":{"name":"Power system technology","volume":"39 1","pages":"387-392"},"PeriodicalIF":0.0,"publicationDate":"2015-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66320738","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}
Utilizing My SQL and Java programming, a hierarchical architecture based simulation platform for coordinated charging of large-scale electric vehicles(EV) is built. According to the data requirement of various simulation algorithms, the modeling of hierarchical architecture and charging/discharging behavior of EV is performed on the built platform to describe the temporal-spatial distribution of charging load of large-scale EV in a wide range, and based on the proposed model a unified interface for simulation algorithms is established. The built platform can be used to simulate and verify both the predictive algorithm for charging load of large-scale EV and the control algorithm for the coordinated charging, thus it provides the possibility to compare the effects of different algorithms. In terms of simulation, the problem that the effects of the predictive and control algorithms given by reference literatures are hard to be verified by experiments due to the smaller development scale of EV at present can be well solved. The functions and the effectiveness of the built platform are shown by analysis of examples.
{"title":"A Hierarchical Architecture Based Simulation Platform for Coordinated Charging of Large-Scale Electric Vehicles","authors":"Zhang，Yongwang, Zhao-wei, Xiao Yong, Lin，Guoying, Chen，Xiaoshuang, Hu Zechun, Zhang，Hongcai, X. Zhiwei","doi":"10.13335/J.1000-3673.PST.2015.01.009","DOIUrl":"https://doi.org/10.13335/J.1000-3673.PST.2015.01.009","url":null,"abstract":"Utilizing My SQL and Java programming, a hierarchical architecture based simulation platform for coordinated charging of large-scale electric vehicles(EV) is built. According to the data requirement of various simulation algorithms, the modeling of hierarchical architecture and charging/discharging behavior of EV is performed on the built platform to describe the temporal-spatial distribution of charging load of large-scale EV in a wide range, and based on the proposed model a unified interface for simulation algorithms is established. The built platform can be used to simulate and verify both the predictive algorithm for charging load of large-scale EV and the control algorithm for the coordinated charging, thus it provides the possibility to compare the effects of different algorithms. In terms of simulation, the problem that the effects of the predictive and control algorithms given by reference literatures are hard to be verified by experiments due to the smaller development scale of EV at present can be well solved. The functions and the effectiveness of the built platform are shown by analysis of examples.","PeriodicalId":20420,"journal":{"name":"Power system technology","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2015-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66320659","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 : 2015-01-05DOI: 10.13335/J.1000-3673.PST.2015.01.038
Pu Tianjiao, Chen Naishi, Ge Xian-jun, Wen Wang, LIUGuangyi
Based on key performance indicators, an evaluation index system for electric power and energy balance, which combines the adequacy, order of power supply, energy saving, economy, is constructed, and the combination of analytical hierarchy process and entropy weight, in which the subjective features and objective features are combined, is taken as the calculation method to evaluate the weight of the index, based on the technique for order preference by similarity to ideal solution(TOPSIS), the scheme of electric power and energy balance is synthetically evaluated. The effectiveness and correctness of the proposed evaluation system and synthetical evaluation method are validated by analysis on actual case.
{"title":"Research on Evaluation Index System and Synthetical Evaluation Method for Balance of Electric Power and Energy","authors":"Pu Tianjiao, Chen Naishi, Ge Xian-jun, Wen Wang, LIUGuangyi","doi":"10.13335/J.1000-3673.PST.2015.01.038","DOIUrl":"https://doi.org/10.13335/J.1000-3673.PST.2015.01.038","url":null,"abstract":"Based on key performance indicators, an evaluation index system for electric power and energy balance, which combines the adequacy, order of power supply, energy saving, economy, is constructed, and the combination of analytical hierarchy process and entropy weight, in which the subjective features and objective features are combined, is taken as the calculation method to evaluate the weight of the index, based on the technique for order preference by similarity to ideal solution(TOPSIS), the scheme of electric power and energy balance is synthetically evaluated. The effectiveness and correctness of the proposed evaluation system and synthetical evaluation method are validated by analysis on actual case.","PeriodicalId":20420,"journal":{"name":"Power system technology","volume":"26 1","pages":"250-256"},"PeriodicalIF":0.0,"publicationDate":"2015-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66320667","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 : 2015-01-01DOI: 10.13335/J.1000-3673.PST.2015.08.007
C. Sun, Y. Yuan, S. Choi, M. Li, X. Zhang, Y. Cao
Wind power output fluctuation brings a lot of negative influences on utility grid as a result of increasing penetration level of wind power. A supercapacitor-battery hybrid storage system is proposed to balance the wind power and planned export power of the wind farm. Firstly, using empirical mode decomposition(EMD), the difference between planned export power and the original wind power(unbalanced power, UP) is analyzed to obtain the intrinsic mode functions(IMFs). Secondly, a mathematic method is then developed to confirm a so-called gap frequency to decompose the unbalanced power into high and low frequency components based on the concept of minimum overlap energy. Unbalanced power smoothing is then achieved by dispatching the powers of supercapatiors and batteries to compensate the high- and low-frequency IMFs according to the characteristics of supercapacitor and batteries respectively. Finally, based on a set of data acquired from an existing wind farm, a hybrid storage system(HSS) is designed aiming at minimizing the capital cost and also can make wind power approach the planned export power of the wind farm in a great extent, numerical analysis verifies the efficiency of the developed method.
{"title":"Capacity Optimization and Operational Strategy of the Wind-Energy Storage Hybrid Systems for Energy Dispatching","authors":"C. Sun, Y. Yuan, S. Choi, M. Li, X. Zhang, Y. Cao","doi":"10.13335/J.1000-3673.PST.2015.08.007","DOIUrl":"https://doi.org/10.13335/J.1000-3673.PST.2015.08.007","url":null,"abstract":"Wind power output fluctuation brings a lot of negative influences on utility grid as a result of increasing penetration level of wind power. A supercapacitor-battery hybrid storage system is proposed to balance the wind power and planned export power of the wind farm. Firstly, using empirical mode decomposition(EMD), the difference between planned export power and the original wind power(unbalanced power, UP) is analyzed to obtain the intrinsic mode functions(IMFs). Secondly, a mathematic method is then developed to confirm a so-called gap frequency to decompose the unbalanced power into high and low frequency components based on the concept of minimum overlap energy. Unbalanced power smoothing is then achieved by dispatching the powers of supercapatiors and batteries to compensate the high- and low-frequency IMFs according to the characteristics of supercapacitor and batteries respectively. Finally, based on a set of data acquired from an existing wind farm, a hybrid storage system(HSS) is designed aiming at minimizing the capital cost and also can make wind power approach the planned export power of the wind farm in a great extent, numerical analysis verifies the efficiency of the developed method.","PeriodicalId":20420,"journal":{"name":"Power system technology","volume":"39 1","pages":"2107-2114"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66320406","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 : 2014-12-05DOI: 10.13335/j.1000-3673.pst.2014.12.026
Zhao Weiwei, Z. Lei, Jing Yanwei
Due to the randomness of wind speed and the nonlinearity of control system for wind power generating units it is hard to achieve accurate mathematical model of wind power generating units. Since the simple proportional integral differential(PID) controller or proportional integral(PI) controller are generally applied in actual wind power generation projects to achieve the control objective to output constant power and it does not come down to complex intelligent control algorithm, in the occasion that the wind speed is higher than rated wind speed an additive decomposition based method is proposed to normalize the design parameter of variable pitch controller for wind power generating units, that is, the variable pitch control problem of wind power generating unit is decomposed into two simple subproblems, namely the tracing of linear time-invariant main system and the stabilization of auxiliary system. Based on the proposed principle, a simple PI controller is designed, and the optimization design of the controller is carried out, and then the stability of this controller is proved by theoretical derivation. Finally, the fact that using the optimized controller the stationary of the output power can be greatly enhanced is validated by simulation results.
{"title":"Optimization Design of Controller for Pitch Wind Turbine","authors":"Zhao Weiwei, Z. Lei, Jing Yanwei","doi":"10.13335/j.1000-3673.pst.2014.12.026","DOIUrl":"https://doi.org/10.13335/j.1000-3673.pst.2014.12.026","url":null,"abstract":"Due to the randomness of wind speed and the nonlinearity of control system for wind power generating units it is hard to achieve accurate mathematical model of wind power generating units. Since the simple proportional integral differential(PID) controller or proportional integral(PI) controller are generally applied in actual wind power generation projects to achieve the control objective to output constant power and it does not come down to complex intelligent control algorithm, in the occasion that the wind speed is higher than rated wind speed an additive decomposition based method is proposed to normalize the design parameter of variable pitch controller for wind power generating units, that is, the variable pitch control problem of wind power generating unit is decomposed into two simple subproblems, namely the tracing of linear time-invariant main system and the stabilization of auxiliary system. Based on the proposed principle, a simple PI controller is designed, and the optimization design of the controller is carried out, and then the stability of this controller is proved by theoretical derivation. Finally, the fact that using the optimized controller the stationary of the output power can be greatly enhanced is validated by simulation results.","PeriodicalId":20420,"journal":{"name":"Power system technology","volume":"38 1","pages":"3436-3440"},"PeriodicalIF":0.0,"publicationDate":"2014-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66320653","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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