DG出力不确定性对交直流混合系统潮流影响的量化分析方法
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摘要
交直流混合系统可以有效接纳多种分布式电源(distributed generation,DG),为研究DG出力不确定性对交直流混合潮流的影响,提出了基于齐诺多面体和线性化潮流的量化分析方法。首先采用齐诺多面体建立DG功率注入的不确定集合,随后通过线性化交直流统一潮流模型,得到了状态量的不确定集合,其包含电压、相角等状态量所有可能的取值,从而分析系统在不确定条件下的运行安全性。文章将所提方法运用在含不同控制方式的交直流混合电网算例中,验证了所提方法的有效性和实用性。
AC/DC hybrid system can effectively integrate different types of distributed generators. In order to analyze the impact of uncertain power output of DGs on AC/DC hybrid power flow, a quantitative analysis method based on zo no tope and linearized power flow model is proposed. Zo no tope is used to construct the uncertainty set of DG power injections,and then through a linearized AC/DC unified power flow model, the uncertainty set of state variables is obtained,which bounds all possible values of the system state variables such as voltage magnitudes and angles, and can be used to analyze the operational safety of the system under uncertainties. Finally,the proposed method is applied to an AC/DC hybrid grid with different control modes and the results verify the effectiveness and practicality of the method.
AC/DC hybrid system can effectively integrate different types of distributed generators. In order to analyze the impact of uncertain power output of DGs on AC/DC hybrid power flow, a quantitative analysis method based on zo no tope and linearized power flow model is proposed. Zo no tope is used to construct the uncertainty set of DG power injections,and then through a linearized AC/DC unified power flow model, the uncertainty set of state variables is obtained,which bounds all possible values of the system state variables such as voltage magnitudes and angles, and can be used to analyze the operational safety of the system under uncertainties. Finally,the proposed method is applied to an AC/DC hybrid grid with different control modes and the results verify the effectiveness and practicality of the method.
引文
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[14]王聪,徐晓贤,沙广林,等.计及灵活配电单元的交直流混合配电系统潮流计算方法[J].电力建设,2018,39(5):56-62.WANG Cong,XU Xiaoxian,SHA Guanglin,et al. Calculation method of power flow in AC/DC hybrid distribution system with flexible power distribution equipment[J]. Electric Power Construction,2018,39(5):56-62.
[15]陈厚合,李国庆,姜涛,等.控制方式转换策略下的改进交直流系统潮流算法[J].电网技术,2011,35(8):93-98.CHEN Houhe, LI Guoqing, JIANG Tao, et al. A modified power flow algorithm for AC/DC power system under transformation strategy of converter control modes[J]. Power System Technology,2011,35(8):93-98.
[16]柴润泽,窦竟铭,张保会.含电压源换流器的交直流混合电网潮流统一表达与可行解求取[J].中国电机工程学报,2016,36(5):1260-1268.CHAI Runze,DOU Jingming,ZHANG Baohui. Unified power flow expressions and algorithm to obtain feasible solution for hybrid AC/DC grids incorporating VSCs[J]. Proceedings of the CSEE,2016,36(5):1260-4268.
[17]雷婧婷,安婷,杜正春,等.含直流配电网的交直流潮流计算[J].中国电机工程学报,2016,36(4):911-918.LEI Jingting, AN Ting, DU Zhengchun, et al. A unified AC/DC power flow algorithm with DC distribution[J]. Proceedings of the CSEE,2016,36(4):911-918.
[18]彭克,张新慧,陈羽.适用于多端柔性互联的交直流配电网潮流计算方法[J].电力自动化设备,2017,37(1):22-27.PENG Ke, ZHANG Xinhui, CHEN Yu. Power flow calculation algorithm for AC-DC hybrid distribution network w ith multiterminal flexible interconnection[J]. Electric Power Automation Equipment,2017,37(1):22-27.
[2]郭雅娟,陈锦铭,何红玉,等.交直流混合微电网接入分布式新能源的关键技术研究综述[J].电力建设,2017,38(3):948.GUO Yajuan,CHEN Jinming,HE Hongyu,et al. A review on AC/DC hybrid microgrid key technology containing distributed new energy[J]. Electric Power Construction,2017,38(3):9-18.
[3] BIJWE P R,RAJU G K V. Fuzzy distribution power flow for weakly meshed systems[J]. IEEE Transactions on Power Systems,2006,21(4):1645-1652.
[4] MATOS M A,GOUVEIA E M. The fuzzy power flow revisited[J].IEEE Transactions on Power Systems,2008,23(1):213-218.
[5]吴巍,汪可友,韩蓓,等.基于Pair Copula的随机潮流三点估计法[J].电工技术学报,2015,30(9):121428.WU Wei,WANG Keyou,HAN Bei,et al. Pair Copula based threepoint estimate method for probabilistic load flow calculation[J].Transactions of China Electro technical Society,2015,30(9):121-428.
[6]栗然,范航,张凡,等.基于拟蒙特卡洛的半不变量法概率潮流计算[J].电力建设,2017,38(11):144-450.LI Ran, FAN Hang, ZHANG Fan, et al. Quasi Monte Carlo based cumulant method for probabilistic load flow calculation[J]. Electric.Power Construction,2017,38(11):144-150.
[7]江雪辰,袁越,吴涵,等.基于分段Copula函数和高斯混合模型的多段线性化概率潮流计算[J].电力建设,2018,39(9):120-428.JIANG Xuechen, YUAN Yue, WU Han,et al. Multistage linearization probabilistic power flow calculation based on piecewise Copula and Gaussian mixture model[J]. Electric Power Construction,2018,39(9):120-428.
[8]廖小兵,刘开培,张亚超,等.基于区间泰勒展开的不确定性潮流分析[J].电工技术学报,2018,33(4):750-758.LIAO Xiaobing,LIU Kaipei,ZHANG Yachao,et al. Uncertain power flow analysis based on interval taylor expansion[J]. Transactions of China Electrotechnical Society,2018,33(4):750-758.
[9]丁涛,崔翰韬,顾伟,等.基于区间和仿射运算的不确定潮流算法[J].电力系统自动化,2012,36(13):51-55.DING Tao,CUI Hantao,GU Wei,et al. An uncertainty power flow algorithm based on interval and affine arithmetic[J]. Automation of Electric Power System,2012,36(13):51-55.
[10] CHU T A, KROGH B H. Computational techniques for hybrid system verification[J]. IEEE Transactions on Automatic Control,2003,48(1):64-75.
[11] JIANG X,CHEN Y C,et al. A set-theoretic framework to assess the impact of variable generation on the power flow[J]. IEEETransactions on Power Systems,2013,28(2):855-867.
[12] JIANG X, DOMINGUEZ-GARCIA A D. A zonotope-based method for capturing the effect of variable generation on the power flow[C]//North American Power Symposium. IEEE, 2014.
[13]王守相,张国栋,王成山.复区间潮流保守性问题的解决方案[J].电力系统自动化,2005,29(19):25-30.WANG Shouxiang,ZHANG Guodong, WANG Chengshan. Solution to conservative property of complex interval power flow[J].Automation of Electric Power System,2005,29(19):25-30.
[14]王聪,徐晓贤,沙广林,等.计及灵活配电单元的交直流混合配电系统潮流计算方法[J].电力建设,2018,39(5):56-62.WANG Cong,XU Xiaoxian,SHA Guanglin,et al. Calculation method of power flow in AC/DC hybrid distribution system with flexible power distribution equipment[J]. Electric Power Construction,2018,39(5):56-62.
[15]陈厚合,李国庆,姜涛,等.控制方式转换策略下的改进交直流系统潮流算法[J].电网技术,2011,35(8):93-98.CHEN Houhe, LI Guoqing, JIANG Tao, et al. A modified power flow algorithm for AC/DC power system under transformation strategy of converter control modes[J]. Power System Technology,2011,35(8):93-98.
[16]柴润泽,窦竟铭,张保会.含电压源换流器的交直流混合电网潮流统一表达与可行解求取[J].中国电机工程学报,2016,36(5):1260-1268.CHAI Runze,DOU Jingming,ZHANG Baohui. Unified power flow expressions and algorithm to obtain feasible solution for hybrid AC/DC grids incorporating VSCs[J]. Proceedings of the CSEE,2016,36(5):1260-4268.
[17]雷婧婷,安婷,杜正春,等.含直流配电网的交直流潮流计算[J].中国电机工程学报,2016,36(4):911-918.LEI Jingting, AN Ting, DU Zhengchun, et al. A unified AC/DC power flow algorithm with DC distribution[J]. Proceedings of the CSEE,2016,36(4):911-918.
[18]彭克,张新慧,陈羽.适用于多端柔性互联的交直流配电网潮流计算方法[J].电力自动化设备,2017,37(1):22-27.PENG Ke, ZHANG Xinhui, CHEN Yu. Power flow calculation algorithm for AC-DC hybrid distribution network w ith multiterminal flexible interconnection[J]. Electric Power Automation Equipment,2017,37(1):22-27.