Abstract
As the high proportion of renewable energy based on power electronics technology is integrated into the grid, the problem of harmonic instability is becoming more and more prominent. This paper solves harmonic instability by optimizing the design of LCL filters. First, the impedance analysis method is used to obtain the positive network damping criterion as a constraint on the LCL filter. Combined with the external characteristics of the LCL filter. To build LCL parameter multi-objective optimization model with minimum inductance cost, maximum harmonic attenuation rate and best current tracking effect; Then, the MOEA/D optimization algorithm is used to solve the multi-objective optimization model; Finally, build the voltage source converter (VSC) system on the MATLAB/SIMULINK platform. The simulation results show that the proposed scheme has superiority and applicability.
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