Control of a 3-phase 4 wire grid connected converter with active power filter and var compensation functionality for nonlinear loads

Abstract

This paper presents control of real power and reactive power together with active filter functionality of a grid connected voltage source converter for 3-phase, 4 wire system in order to eliminate harmonic currents associated with non-linear load in each phase. A classical instantaneous real and reactive power control method is used together with a harmonic elimination technique. A three-phase voltage source converter is used to control the reference current based on fixed hysteresis band current control. The active and reactive power are independently controlled whilst the grid current is compensated to be nearly sinusoidal waveform. The simulation results verify the correctness of operation for the proposed functions using MATLAB/Simulink.

Control of a multifunctional 3-phase 4-wire grid connected converter using adaptive hysteresis current controller

“…The reference current calculation process is necessary to meet objectives of multifunctional operation of the converter. There are several techniques to obtain the reference currents [4][5][6][7].…”

“…In order to obtain both functions, the reference currents can be achieved by adding (3) and (4) as (5) The inverse transformation of (5), in order to obtain the reference currents on the abc system can be expressed as (6) The process of calculating the reference currents is shown in block diagram of Fig.2. The obtained reference currents from Fig.2 will be used for generating PWM signals for switching devices in the main power circuit by an adaptive hysteresis current controller according to Fig.1.…”