电网电压不平衡下储能变流器能量最优控制策略  

Energy Optimal Control Strategy of Power Conversion System under Unbalanced Grid Voltage

作　　者：夏向阳[1] 廖一丁 陈凌彬 吴小忠 XIA Xiangyang;LIAO Yiding;CHEN Lingbin;WU Xiaozhong(School of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410114,China;State Grid Hunan Electric Power Co.,Ltd,Changsha 410005,China)

机构地区：[1]长沙理工大学电气与信息工程学院,湖南长沙410114 [2]国网湖南省电力有限公司,湖南长沙410005

出　　处：《湖南大学学报（自然科学版）》2023年第4期165-175,共11页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51977014)。

摘　　要：针对电压不平衡时储能变流器(Power Conversion System, PCS)出现网侧电流波形畸变严重且峰值过大等问题,提出了电网电压不平衡下储能变流器能量最优控制策略.该策略通过控制目标参数k、电网电压不平衡度与瞬时功率波动、网侧电流不平衡度和网侧电流峰值的关系图深入分析了参数k、电网电压不平衡度对系统能量运行的影响,并在此基础上侧重抑制电流幅值及抑制功率波动两个控制目标,加入寻优算法,提出k参数仅在[-1,0]内选择的电流限幅储能变流器能量最优控制策略.仿真实验结果表明:该策略能通过k参数和电流限幅策略更加快速有效地将电流峰值限制在最大允许峰值,并且进一步减小功率波动,提升PCS的有功功率输出能力,体现了对储能变流器运行的能量优化.Aiming at the problems of serious distortion and excessive peak value of grid-side current waveform in power conversion systems(PCS)under unbalanced voltage,this paper proposes an energy optimal control strategy for PCS under unbalanced grid voltage.The control strategy deeply analyzes the influence of parameter k and grid voltage imbalance on the energy operation of the system through the relationship between the control target parameter k,the grid voltage imbalance and the instantaneous power fluctuation,the grid-side current imbalance,and the grid-side current peak.On this basis,to focus on the two control objectives of suppressing the current amplitude and power fluctuations,the optimization algorithm is added,and the energy optimization control strategy of the current limiting PCS with the parameter k selected only within[-1,0]is proposed.The simulation results show that the control strategy can more quickly and effectively limit the current peak value to the maximum allowable peak value through the k parameter and current limiting control strategy,and further reduce the power fluctuation and improve the active power output capacity of PCS,which reflects the energy optimization of PCS operation.

关 键 词：储能变流器 电网电压不平衡 电流限幅 功率波动 

分 类 号：TM464[电气工程—电器]