摘要
由于离散误差、电网频率波动等因素的影响,PR控制器的实际谐振点与电网频率总存在一定的误差,导致PR控制器跟踪性能迅速下降。为解决该问题,通过对逆变器进行坐标变换,将静止坐标系下的交流量转化为同步旋转坐标系下的直流量,并基于同步旋转坐标系提出一种逆变器并网电流控制策略,最后,通过仿真验证所提控制策略的可行性。仿真结果表明,该策略能够在同步旋转坐标系下实现并网电流的零稳态误差控制。
Due to the influence of factors such as the discrete errors and the grid frequency fluctuations,there is always a certain error between the actual resonance point of the PR controller and the power grid frequency,which leads to a rapid decline in the tracking performance of the PR controller.In order to solve this problem,the AC current in the static coordinate system is converted into the DC current in the synchronous rotating coordinate system by the coordinate transformation of the inverter,and a grid-connected current control strategy of the inverter is proposed based on the synchronous rotating coordinate system.Finally,the feasibility of the proposed control strategy is verified through simulation.The simulation results show that the strategy can achieve zero steady-state error control of grid-connected current in the synchronous rotating coordinate system.
作者
吴慧芳
丁欣
覃柳文
WU Huifang;DING Xin;QIN Liuwen(Guangxi Electrical Polytechnic Institute,Guangxi Nanning 530007,China;Guangxi Water Resources and Electrical Power Vocational and Technical College,Guangxi Nanning 530023,China;School of Electrical Engineering,Guangxi University,Guangxi Nanning 530004,China)
出处
《广西电力》
2020年第6期62-66,共5页
Guangxi Electric Power
基金
2018年度广西高校中青年教师基础能力提升项目(2018KY1122)
2019年度广西高校中青年教师科研基础能力提升项目(2019KY1332)。
关键词
并网逆变器
dq坐标变换
LCL滤波器
有源阻尼
grid-connected inverter
dq coordinate transformation
LCL filter
active damping
