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Non-linear controller is preferred to linear controller due to non-linearoperation of DSTATCOM. System dynamic can be improved by regulating and fixingthe capacitor DC voltage in DSTATCOM. The nonlinear control is based on exactlinearization via feedback. There is a PI controller in this system to regulateDC voltage. In conventional scheme, the trial and error method is used todetermine PI values. Exact calculation to optimize PI coefficients can becarried out to reduce disturbances in DC link voltage and thus, in this paper,Particle Swarm Optimization is applied. As a result, Capacitor voltage tracksthe reference values which have less vibration than conventional status. Bothtrial and error method and PSO are implemented. A set of corresponding diagramsachieved by these two methods are offered to demonstrate the effectiveness ofnew method. Optimizations and Simulations are worked out in MATLAB environment.

Optimization of PI Coefficients in DSTATCOM Nonlinear Controller for Regulating DC Voltage using Particle Swarm Optimization