微网逆变器无功出力按容量分配的改进控制策略  

Improved control strategy of microgrid inverters with reactive power distributed by capacity

作　　者：樊梦蝶 曾成碧[1] 苗虹[1] FAN Mengdie;ZENG Chengbi;MIAO Hong(School of Electrical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学电气工程学院

出　　处：《电力系统保护与控制》2019年第23期100-107,共8页Power System Protection and Control

基　　金：国家重点研发项目资助(2018YFC1505502-03);四川省科技厅项目资助(2018GZ0394);成都市科技局项目资助(2017-RK00-00219-ZF)~~

摘　　要：为了解决馈线阻抗不一致导致的微网逆变器无功出力不能均分的问题,提出了一种基于电流下垂控制的改进控制策略。通过测量和计算公共耦合点(Point of Common Coupling,PCC)处的无功电流按额定容量权重所得值,作为所有逆变器的基准值,并由母线信息控制改进的微积分控制器的使能,精确调节无功电流下垂曲线的电压偏置。该方法能够避免馈线阻抗造成的电压跌落,使逆变器按容量分配负荷,对通信依赖程度低,且消除周期功率延迟,具有良好的自适应能力和稳定性。仿真和实验也充分证明了所提控制策略的正确性和可行性。In order to solve the problem that the reactive power of microgrid inverters can not be divided equally due to the inconsistency of line impedance,this paper proposes an improved current droop control strategy.To precisely adjust the voltage bias of the reactive current droop curve,in this research,the measured and calculated value of the reactive current at the point of common coupling(PCC)by capacity is used as the reference of all inverters,the bus information is used to control the improved calculus controller.The method can compensate for the voltage drop caused by impedance,which makes the inverter accurately divide load according to capacity,with low communication dependence,no periodic power delay,and good adaptability and stability.Simulation and experiment also fully prove the correctness and feasibility of the proposed control strategy.

关 键 词：并联逆变器 微电网 电流下垂控制 馈线阻抗 容量 无功出力均分 

分 类 号：TM7[电气工程—电力系统及自动化]