并网逆变器并联运转式LCL滤波器相互干扰特性研究

Study on Mutual Interference Characteristics of Parallel Operation LCL Filters for Grid-connected Inverters

本文分析了在使用LCL滤波器的并网逆变器并联运行的情况下,由于LCL滤波器与电网阻抗之间的相互干扰而引起的谐振特性,并通过仿真和实验进行了验证。使用两个逆变器并联并网,并将包括LCL滤波器在内的系统参数设置为相同条件。在逆变器在公共耦合点并联运行的情况下,电网阻抗的存在将导致每个逆变器的LCL滤波器之间的相互干扰,并分析滤波器谐振频率的偏差,以了解并联逆变器设备数量与电网阻抗大小之间的相关性。用PSIM进行了仿真,并用MATLAB进行了验证。通过实时数字模拟器Typhoon HILS与DSP 28377控制板的连接,测试了两台逆变器并联运行条件下的相互干扰特性,并通过获得与分析结果相同的实验结果验证了分析的有效性。

In this paper analyzes the resonance characteristics caused by the mutual interference between the LCL filter and the grid impedance under the parallel operation of the grid-connected inverter using the LCL filter,and verifies it through simulation and experiment.Use two inverters to connect to the grid in parallel,and set the system parameters including the LCL filter to the same conditions.In the case of inverters running in parallel at the point of common coupling,the presence of grid impedance will cause mutual interference between the LCL filters of each inverter,and the deviation of the filter resonance frequency is analyzed to understand the parallel inverter,and the correlation between the number of devices and the size of the grid impedance.It is simulated by PSIM and verified by MATLAB.Through the connection of the real-time digital simulator Typhoon HILS and the DSP 28377 control board,the mutual interference characteristics were tested under the condition of two inverters running in parallel,and the validity of the analysis was verified by obtaining the same experimental result as the analysis result.