微网储能系统的自补偿动态下垂控制策略研究
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摘要
为了充分发挥储能单元维持微电网系统功率平衡,提出了基于储能单元剩余容量(state of charge,SOC)带自补偿的动态下垂控制策略。由于传统的下垂控制的下垂系数过大导致母线电压偏离,并且固定下垂系数运用在储能单元充放电控制上,会导致蓄电池过充过放问题。针对此问题,设计新的动态下垂系数,使得各储能单元的功率与SOC值成比例;并推导电压补偿算法来消除由下垂控制带来的母线电压偏离。与传统的二次控制相比降低了控制复杂度。最后利用MATLAB/Simulink对所提出的控制结构进行验证。
In order to take advantage of the energy storage system in maintaining the microgrid system power balance,an improved state of charge(SOC)based dynamic droop control strategy with self-compensation for energy storage systems is proposed in this paper.The traditional large droop coefficient leads to bus voltage deviation,and the fixed droop coefficient to control charge and discharge of energy storage system would cause overcharge and over-discharge of battery.Therefore,a new dynamic droop coefficient is designed to distribute the power proportional of the SOC value of the storage system.In addition,the voltage compensation algorithm is deduced to eliminate the bus voltage deviation caused by droop control.Compared to the conventional secondary control,the proposed method reduces the control complexity.Finally,the proposed control structure is verified by Matlab/Simulink simulation.
In order to take advantage of the energy storage system in maintaining the microgrid system power balance,an improved state of charge(SOC)based dynamic droop control strategy with self-compensation for energy storage systems is proposed in this paper.The traditional large droop coefficient leads to bus voltage deviation,and the fixed droop coefficient to control charge and discharge of energy storage system would cause overcharge and over-discharge of battery.Therefore,a new dynamic droop coefficient is designed to distribute the power proportional of the SOC value of the storage system.In addition,the voltage compensation algorithm is deduced to eliminate the bus voltage deviation caused by droop control.Compared to the conventional secondary control,the proposed method reduces the control complexity.Finally,the proposed control structure is verified by Matlab/Simulink simulation.
引文
[1]胡雪峰,王璐,龚春英,等.可再生能源并网发电馈网电流中的谐波分析及其抑制策略[J].中国电机工程学报,2010,30(S):167-170.HU Xuefeng,WANG Lu,GONG Chunying,et al.Harmonic analysis and suppression strategies of grid current for renewable energy grid integration system[J].Proceedings of the CSEE,2010,30(S):167-170.
[2]张庆海,彭楚武,陈燕东,等.一种微电网多逆变器并联运行控制策略[J].中国电机工程学报,2012,32(25):126-132.ZHANG Qinghai,PENG Chuwu,CHEN Yandong,et al.A control strategy for parallel operation of multi-inverters in microgrid[J].Proceedings of the CSEE,2012,32(25):126-132.
[3]李武华,顾云杰,王宇翔,等.新能源直流微网的控制架构与层次划分[J].电力系统自动化,2015,39(9):156-163.LI Wuhua,GU Yunjie,WANG Yuxiang,et al.Control architecture and hierarchy division for renewable energy DC microgrids[J].Automation of Electric Power Systems,2015,39(9):156-163.
[4]郭力,张绍辉,李霞林,等.考虑电网分时电价的直流微电网分层协调控制[J].电网技术,2016,40(7):1992-2000.GUO Li,ZHANG Shaohui,LI Xialin,et al.Hierarchical coordination control for DC microgrid considering time-of-use price[J].Power System Technology,2016,40(7):1992-2000.
[5]DIAZ N L,DRAGICEVIC T,VASQUEZ J C,et al.Intelligent distributed generation and storage units for DCmicrogrids-a new concept on cooperative control without communications beyond droop control[J].IEEE Transactions on Smart Grid,2014,5(5):2476-2485.
[6]李霞林,郭力,王成山,等.直流微电网关键技术研究综述[J].中国电机工程学报,2016,36(1):2-17.LI Xialin,GUO Li,WANG Chengshan,et al.Key technologies of DC microgrids:an overview[J].Proceedings of the CSEE,2016,36(1):2-17.
[7]向阳,付明,张爱芳,等.孤岛运行的交直流混合微电网小信号稳定性分析[J].电力建设,2017,38(1):96-105.XIANG Yang,FU Ming,ZHANG Aifang,et al.Small signal stability analysis of AC/DC hybrid microgrid under isolated island operation[J].Electric Power Construction,2017,38(1):96-105.
[8]ZHOU Xiaoping,ZHOU Leming,CHEN Yandong,et al.A microgrid cluster structure and its autonomous coordination control strategy[J].Electrical Power and Energy Systems,2018:69-80.
[9]SHIVAM,RATNA D.Intelligent distributed control techniques for effective current sharing and voltage regulation in DC distributed systems[J].Electrical Engineering,2017,42:5071-5081.
[10]LU Xiaonan,JOSEP M.SUN Kai,et al.An improved droop control method for DC microgrids based on low bandwidth communication with DC bus voltage restoration and enhanced current sharing accuracy[J].Transactions on Power Electronics,2014,29(4):1800-1812.
[11]杨婕,金新民,吴学智,等.一种适用于直流微电网的改进型电流负荷分配控制策略[J].中国电机工程学报,2016,36(1):59-67.YANG Jie,JIN Xinmin,WU Xuezhi,et al.An improved load current sharing control method in DC microgrids[J].Proceedings of the CSEE,2016,36(1):59-67.
[12]支娜,张辉,肖曦,等.提高直流微电网动态特性的改进下垂控制策略研究[J].电工技术学报,2016,31(3):31-39.ZHI Na,ZHANG Hui,XIAO Xi.Research on the improved droop control strategy for improving thedynamic characteristicsof DC microgrid[J].Transactions of China Electrotechnical Society,2016,31(3):31-39.
[13]HSUANG C,KUO K J,GWO H Y,et al.Improved droop control method with precise current sharing and voltage regulation[J].IET Power Electronics,2016,9(4):789-800.
[14]SHIVAM,RATNA D.Intelligent distributed control techniques for effective current sharing and voltage regulation in DC distributed systems[J].Arab JSci,2017,43:5071-5081.
[2]张庆海,彭楚武,陈燕东,等.一种微电网多逆变器并联运行控制策略[J].中国电机工程学报,2012,32(25):126-132.ZHANG Qinghai,PENG Chuwu,CHEN Yandong,et al.A control strategy for parallel operation of multi-inverters in microgrid[J].Proceedings of the CSEE,2012,32(25):126-132.
[3]李武华,顾云杰,王宇翔,等.新能源直流微网的控制架构与层次划分[J].电力系统自动化,2015,39(9):156-163.LI Wuhua,GU Yunjie,WANG Yuxiang,et al.Control architecture and hierarchy division for renewable energy DC microgrids[J].Automation of Electric Power Systems,2015,39(9):156-163.
[4]郭力,张绍辉,李霞林,等.考虑电网分时电价的直流微电网分层协调控制[J].电网技术,2016,40(7):1992-2000.GUO Li,ZHANG Shaohui,LI Xialin,et al.Hierarchical coordination control for DC microgrid considering time-of-use price[J].Power System Technology,2016,40(7):1992-2000.
[5]DIAZ N L,DRAGICEVIC T,VASQUEZ J C,et al.Intelligent distributed generation and storage units for DCmicrogrids-a new concept on cooperative control without communications beyond droop control[J].IEEE Transactions on Smart Grid,2014,5(5):2476-2485.
[6]李霞林,郭力,王成山,等.直流微电网关键技术研究综述[J].中国电机工程学报,2016,36(1):2-17.LI Xialin,GUO Li,WANG Chengshan,et al.Key technologies of DC microgrids:an overview[J].Proceedings of the CSEE,2016,36(1):2-17.
[7]向阳,付明,张爱芳,等.孤岛运行的交直流混合微电网小信号稳定性分析[J].电力建设,2017,38(1):96-105.XIANG Yang,FU Ming,ZHANG Aifang,et al.Small signal stability analysis of AC/DC hybrid microgrid under isolated island operation[J].Electric Power Construction,2017,38(1):96-105.
[8]ZHOU Xiaoping,ZHOU Leming,CHEN Yandong,et al.A microgrid cluster structure and its autonomous coordination control strategy[J].Electrical Power and Energy Systems,2018:69-80.
[9]SHIVAM,RATNA D.Intelligent distributed control techniques for effective current sharing and voltage regulation in DC distributed systems[J].Electrical Engineering,2017,42:5071-5081.
[10]LU Xiaonan,JOSEP M.SUN Kai,et al.An improved droop control method for DC microgrids based on low bandwidth communication with DC bus voltage restoration and enhanced current sharing accuracy[J].Transactions on Power Electronics,2014,29(4):1800-1812.
[11]杨婕,金新民,吴学智,等.一种适用于直流微电网的改进型电流负荷分配控制策略[J].中国电机工程学报,2016,36(1):59-67.YANG Jie,JIN Xinmin,WU Xuezhi,et al.An improved load current sharing control method in DC microgrids[J].Proceedings of the CSEE,2016,36(1):59-67.
[12]支娜,张辉,肖曦,等.提高直流微电网动态特性的改进下垂控制策略研究[J].电工技术学报,2016,31(3):31-39.ZHI Na,ZHANG Hui,XIAO Xi.Research on the improved droop control strategy for improving thedynamic characteristicsof DC microgrid[J].Transactions of China Electrotechnical Society,2016,31(3):31-39.
[13]HSUANG C,KUO K J,GWO H Y,et al.Improved droop control method with precise current sharing and voltage regulation[J].IET Power Electronics,2016,9(4):789-800.
[14]SHIVAM,RATNA D.Intelligent distributed control techniques for effective current sharing and voltage regulation in DC distributed systems[J].Arab JSci,2017,43:5071-5081.