PSO based optimal PI tunning of AHCC D-STATCOM

This paper presents a design of adaptive hysteresis current controller (AHCC) by optimal tuning of PI regulator using PSO technique for a distribution static compensator (D-STATCOM). It is desirable to have optimal values of K_p and K_i in a PI regulator to decreases steady state error and improve stability of the system. This generates accurate values of reference injected currents and compare with instantaneous injected currents with help of AHCC in D-STATCOM. Hence to mitigate the source current harmonics and to improve the power quality in distribution system under different load considerations. The dynamic model of D-STATCOM has been adopted with AHCC by using MATLAB/Simulink. The optimal value K_p and K_i in a PI regulator are computed using particle swarm optimization (PSO) technique and the results are verified by genetic algorithm (GA). The simulations result show that the proposed PSO technique gives minimum error and optimally chosen parameters of PI, as compared to GA technique.