分散式SOC均衡控制微网系统电压恢复策略
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摘要
微电网内的分布式储能单元一般采用传统下垂控制来实现调压和调频的目的,但是当采用传统的下垂控制时会出现SOC不平衡和电压偏移现象,而SOC不平衡和严重的电压偏移将会导致分布式储能单元不能正常工作。针对这个问题,本文提出一种改进下垂控制方案。该方案通过在传统下垂控制的基础上引入SOC平衡因子和电压恢复因子来实现SOC平衡和电压的恢复。该方案不需要中央控制器或者通讯线,降低了系统的成本,具有即插即用的特性。最后,利用PSCAD仿真软件和实验平台进行仿真和实验,仿真和实验结果验证了所提方案的有效性。
The conventional droop control is usually used by distributed energy storage to regulate the voltage and frequency of microgrid.At the same time,the SOC unbalance and serious voltage deviation will occurs with the change of loads in the microgrid,which will cause the system can not operate normally.Therefore,an improved droop control is proposed in this paper to overcome this problem.The SOC balance and voltage recovery factor are added to conventional droop control to realize the SOC balance and voltage restoration.The scheme does not require central controller or communication line,which reduces the cost of the system,and has plug and play characteristics.Finally,the simulation is carried out by using PSCAD software and the simulation and experimental results verify the effectiveness of the proposed scheme.
The conventional droop control is usually used by distributed energy storage to regulate the voltage and frequency of microgrid.At the same time,the SOC unbalance and serious voltage deviation will occurs with the change of loads in the microgrid,which will cause the system can not operate normally.Therefore,an improved droop control is proposed in this paper to overcome this problem.The SOC balance and voltage recovery factor are added to conventional droop control to realize the SOC balance and voltage restoration.The scheme does not require central controller or communication line,which reduces the cost of the system,and has plug and play characteristics.Finally,the simulation is carried out by using PSCAD software and the simulation and experimental results verify the effectiveness of the proposed scheme.
引文
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[3]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 F D,WU M.An improved control strategy of load distribution in an autonomous microgrid[J].Proceedings of the CSEE,2011,31(13):18-25.
[4]刘家赢,韩肖清,王磊,等.直流微电网运行控制策略[J].电网技术,2014,38(9):2356-2362.LIU J Y,HAN X Q,WANG L,et al.Operation and control strategy of DC microgrid[J].Power System Technology,2014,38(9):2356-2362.
[5]李彦林,王明彦,郑载满.微网运行条件下储能并网VSC多目标控制策略[J].电网技术,2013,37(7):1792-1798.LI Y L,WANG M Y,ZHENG Z M.A multi-objective control strategy for grid-connecting VSC under grid-connected operation of microgrid[J].Power System Technology,2013,37(7):1792-1798.
[6]SHAFIEE Q,GUERRERO J M,VASQUEZ J C.Distributed secondary control for islanded microgrids—a novel approach[J].IEEE Transactions on Power Electronics,2014,29(2):1018-1031.
[7]XU Y,ZHANG W,HUG G,et al.Cooperative control of distributed energy storage systems in a microgrid [J].IEEE Transactions on Smart Grid,2015,6(1):238-248.
[8]RAGHAMI A,AMELI M T,HAMZEHM.Primary and secondary frequency control in an autonomous microgrid supported by a load-shedding strategy[C]//4th Annual International Power Electronics,Drive Systems and Technologies Conference,Tehran, Iran,2013:282-287.
[9]LI C,ERNANE C,DRAGICEVIC T,et al.Multiagent-based distributed state of charge balancing control for distributed energy storage units in AC microgrids[J].IEEE Transactions on Industrial Electronics,2015,53(3):2369-2381.
[10]张明军,曹立霞,厉吉文,等.考虑多分区无功电压优化的多Agent系统[J].电力系统自动化,2004,28(17):70-74.ZHANG M J,CAO L X,LI J W,et al.Multi-agent system for voltage/var optimization consideringmulti-regional power systems[J].Automation of Electric Power Systems,2004,28(17):70-74.
[11]荆龙,黄杏,吴学智.改进型微源下垂控制策略研究[J].电工技术学报,2014,29(2):145-152.JING L,HUANG X,WU X Z.Research onimproved microgrid droop control method[J].Transactions of China Electrotechnical Society,2014,29(2):145-152.
[12]王成山,武震,李鹏.微电网关键技术研究[J].电工技术学报,2014,29(2):1-12.WANG C S,WU Z,LI P.Research onkey technologies of microgrid[J].Transactions of China Electrotechnical Society,2014,29(2):1-12.