基于下垂控制的柔性直流配电网综合调度指标和调度策略
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摘要
基于柔性直流配电网架构,分析了节点变流器下垂控制原理以及其对节点运行点的控制机制;根据电路原理和戴维南定理研究了基于下垂控制的柔性直流配电网的电气和电网络机理,并以此提出一个与各节点功率、电压及下垂斜率有关的综合性配电网潮流调度指标;同时,针对节点运行状况的优化目标,深入探讨了一种调度控制策略;最后,参考国际大电网会议的B4网络提出一个八端柔性直流配电网结构,并以此对所提出的综合调度指标和调度控制策略进行分析验证。
Based on the structure of flexible DC distribution network, the principle of droop control of node converters and its control to node operation were analyzed.Then, the electrical network mechanism of flexible DC distribution network that based on droop control was studied on the basis of circuitous. And a comprehensive dispatching index of the power flow in distribution network that was related to power, voltage and droop slope of each node was proposed.Simultaneously, according to the optimization goal of the node operation, two scheduling control strategies were discussed in depth. Finally, an eight-port flexible distribution network was put forward with reference to the B4 network of International Council on Large Electric Systems, with which the integrated scheduling index and the strategies were analyzed and verified.
Based on the structure of flexible DC distribution network, the principle of droop control of node converters and its control to node operation were analyzed.Then, the electrical network mechanism of flexible DC distribution network that based on droop control was studied on the basis of circuitous. And a comprehensive dispatching index of the power flow in distribution network that was related to power, voltage and droop slope of each node was proposed.Simultaneously, according to the optimization goal of the node operation, two scheduling control strategies were discussed in depth. Finally, an eight-port flexible distribution network was put forward with reference to the B4 network of International Council on Large Electric Systems, with which the integrated scheduling index and the strategies were analyzed and verified.
引文
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[2]Flourentzou N,Agelidis V G,Demetriades GD.VSC-based HVDC power transmission systems:An overview[J].IEEE Transactions on Power Electronics,2009,24(3):592-602.
[3]宋强,赵彪,刘文华,等.智能直流配电网研究综述[J].中国电机工程学报,2013,33(25):9-19.Song Qiang,Zhao Biao,Liu Wenhua,et al.An overview of research on smart DC distribution power network[J].Proceedings of the CSEE,2013,33(25):9-19(in Chinese).
[4]Zhong Q C,Zeng Y,Universal droop control of inverters with different types of output impedance[J].IEEE Access,2016(4):702-712.
[5]Simpson-Porco J W,D?rfler F,Bullo F.Voltage stabilization in microgrids via quadratic droop control[J].IEEE Transactions on Automatic Control,2017,62(3):1239-1253.
[6]李福东,吴敏.微网孤岛模式下负荷分配的改进控制策略[J].中国电机工程学报,2011,31(13):18-25.Li Fudong,Wu Min.An improved control strategy of load distribution in an autonomous microgrid[J].Proceedings of the CSEE,2011,31(13):18-25(in Chinese).
[7]Hu J,Duan J,Ma H,et al.Distributed adaptive droop control for optimal power dispatch in DC-microgrid[J].IEEE Transactions on Industrial Electronics,2017,PP(99):1-1.
[8]陆晓楠,孙凯,黄立培,等.直流微电网储能系统中带有母线电压跌落补偿功能的负荷功率动态分配方法[J].中国电机工程学报,2013,33(16):37-46,20.Lu Xiaonan,Sun Kai,Huang Lipei,et al.Dynamic load power sharing method with elimination of bus voltage deviation for energy storage systems in DC micro-grids[J].Proceedings of the CSEE,2013,33(16):37-46,20(in Chinese).
[9]Xiao L,Xu Z,An T,et al.Improved analytical model for the study of steady state performance of droop-controlled VSC-MTDC systems[J].IEEE Transactions on Power Systems,2016,PP(99):1-1.
[10]曾正,邵伟华,冉立,等.基于直流电气弹簧的直流配电网电压波动抑制[J].电工技术学报,2016,31(17):23-31.Zeng Zheng,Shao Weihua,Ran Li,et al.DC electric spring for voltage fluctuation suppressing of DCdistribution network[J].Transactions of China Electrotechnical Society,2016,31(17):23-31(in Chinese).
[11]马秀达,康小宁,李少华,等.多端柔性直流配电网的分层控制策略设计[J].西安交通大学学报,2016,50(8):117-122,150.Ma Xiuda,Kang Xiaoning,Li Shaohua,et al.Hierarchical control in multi-terminal flexible DC distribution system[J].Journal of Xi’an Jiaotong University,2016,50(8):117-122,150(in Chinese).
[12]季一润,袁志昌,赵剑锋,等.一种适用于柔性直流配电网的电压控制策略[J].中国电机工程学报,2016,36(2):335-341.Ji Yirun,Yuan Zhichang,Zhao Jianfeng,et al.A suitable voltage control strategy for DC distribution power network[J].Proceedings of the CSEE,2016,36(2):335-341(in Chinese).
[13]杨舒婷,王承民,李骄阳,等.直流配电网的集中分布式控制策略[J].电网技术,2016,40(10):3073-3080.Yang Shuting,Wang Chengmin,Li Jiaoyang,et al.Centralized-distributed control strategies in DCdistribution[J].Power System Technology,2016,40(10):3073-3080(in Chinese).
[14]蒋智化,刘连光,刘自发,等.直流配电网功率控制策略与电压波动研究[J].中国电机工程学报,2016,36(4):919-926.Jiang Zhihua,Liu Lianguang,Liu Zifa,et al.Research on power flow control and the voltage fluctuation characteristics of DC distribution networks based on different control strategies[J].Proceedings of the CSEE,2016,36(4):919-926(in Chinese).
[15]Rouzbehi K,Miranian A,Luna A,et al.DC voltage control and power sharing in multi-terminal DC grids based on optimal power flow and voltage-droop strategy[J].IEEE Journal of Emerging and Selected Topics in Power Electronics,2014,2(4):1171-1180.