三相光伏并网逆变器电流双闭环控制  

Dual-loop Grid Current Regulation for Three-Phase PV Grid-Connected Inverters

作　　者：伏亮亮 郑恩让[1] 

机构地区：[1]陕西科技大学电气与信息工程学院,陕西西安710021

出　　处：《计算机仿真》2017年第5期127-131,共5页Computer Simulation

基　　金：陕西省科技厅项目(2012K09-13)

摘　　要：针对三相三电平光伏并网逆变器传统控制中电流误差和电网干扰无法完全消除,以及滤波器带来的谐振问题,提出电流双闭环控制方案。其中电容电流内环采用比例反馈有源阻尼法,达到减小损耗、抑制电流谐振的目的,并网电流外环采用比例复数积分控制,可消除电流误差,抑制电网干扰。对LCL型三相三电平光伏并网逆变控制系统进行建模和理论分析,并进行了参数设计,用PSIM软件搭建仿真模型对理论分析进行验证。结果表明该控制策略损耗小,谐振抑制效果好,具有消除电流误差和抑制电网干扰的能力。Current dual-loop control scheme is proposed for traditional control problems of the current error and grid disturbances and resonance caused by the filter in three-phase three-level PV grid-connected inverters with LCL filter. Capacitance current active damping method of proportional inner loop feedback is used to reduce the loss and suppress the current resonance, and grid current proportional complex integral control in outer loop is used to elimi- nate steady-state errors and avoid the interference of grid voltage for grid current. Modeling, theoretical analysis and the design of parameters are carried out for the control system, and PSIM software is used to build simulation models to verify the theoretical analysis. The results show that the control strategy has the advantage of low loss and excellent resonance suppression effect, at the same time has the ability to eliminate the current error and suppress grid interference.

关 键 词：并网逆变器 电容电流反馈 比例复数积分控制 

分 类 号：TM743[电气工程—电力系统及自动化]