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A Fuzzy Logic Controller for Autonomous Operation of a Voltage Source Converter Based Distributed Generation System

سال انتشار : 2015

نوع مقاله : IEEE JOURNAL & MAGAZINES

تعداد صفحات : 7

Abstract—This paper presents a fuzzy logic controller (FLC)

for autonomous (islanded) operation of an electronically interfaced

distributed generation unit and its load. In the gridconnected

mode, the voltage-sourced converter is operated in the

active and reactive power (PQ) control mode, where a conventional

control scheme is used to control the active and reactive

power exchange with the grid. In the islanded mode, the proposed

FLC is used to control the voltage of the islanded system

despite the load variability and uncertainties. In addition, this

paper also presents the use of the black-box nonlinear optimization

technique to tune the parameters of the membership

functions of the FLC in order to achieve optimal performance.

The salient features of the proposed FLC are: 1) efficient to

deal with the nonlinear systems; 2) design does not depend on

the mathematical model of the system; and 3) less sensitive to

the parameters variation than the conventional controllers. The

frequency of the islanded system is dictated through the use of

an internal oscillator. The effectiveness of the proposed FLC in

controlling the voltage of the islanded system, irrespective of

the load variability, is extensively validated based on simulation

studies in the PSCAD/EMTDC environment. Moreover, the paper

highlights the superiority of the proposed FLC over the conventional

proportional-integral controllers through comparing the

transient responses of the system based on both controllers.

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