Modelling of DSTATCOM for Improvement of Power Quality using Fuzzy Controller by Fuzzy C-Means Clustering [articol]

Abstract

In recent years for reactive power compensation, inverter based conditioners have been used, due to their faster responses. To improve the quality of power in a distribution system, Distribution Static Synchronous Compensator (DSTATCOM), which is an inverter based device, has been used broadly. To control these kinds of devices, Proportional-Integral (PI) controller is used with certain pre-specified fixed parameters. Nowadays, the performances of these kind of controllers are not up to the expectation due to the nonlinearity of the system .In this paper , the Fuzzy Logic controller is described with the use of Fuzzy C-Means clustering (FCM) algorithm to design fuzzy rules and membership functions for the control of direct and quadrature axes currents of DSTATCOMs. Simulations on wide range of processes are carried out by using MATLAB/Simulink software and the responses are observed by changing the reference reactive current. The results are compared between the controllers in terms of several performance measures and in which, the DSTATCOM improves the damping of a power system by the proposed schemes.