The distributed parameters of collector feeders on the photovoltaic and wind farm have an important influence on the resonance of converters based on LCL filters

presenting a challenge to converter control system design. In order to investigate the impact of the renewable power plant collector system on the stability of grid-connected multi-converters

a mathematical model for the multi-converter system is developed using the network admittance matrix in the complex frequency domain

and frequency characteristics are analyzed. It is shown that the influence on the stability of converters varies with topological form and feeder length of different feeder types in the collector system. The validity of the relevant conclusions is verified by simulation results based on MATLAB/Simulink. This work is supported by National Natural Science Foundation of China(No. 51190104)

National Basic Research Program of China(973 Program)(No. 2012CB215100)and State Grid Corporation of China(No. 52283014003).