A new approach to design digital controller for three phase active power line conditioner for harmonic compensation using 8051 microcontroller

Abstract

The non-linear devices used in the present environment like computers, printers, lasers, smps, rectifiers etc. pollutes the power system by harmonics and reactive power. Due to the presence of harmonics in the power system a number of undesirable effects caused in the distribution network. To find the solution for this the active power filter (APF) is one of the suitable solutions, which compensates Harmonics as well as reactive power simultaneously. This paper presents a active power line conditioning system to improve the power quality in the distribution network and implementation of a digital controller using 8051 microcontroller. The active power line conditioner is implemented with Pulse Width Modulation (PWM) based current controlled voltage source inverter (VSI). The Digital Controller is designed using MCS 8051 microcontroller which becomes independent of process technology. Synchronous reference frame (SRF) is used for generation of reference current. The PI current algorithm is implemented using MATLAB platform. The shunt APF is modeled and investigated under different unbalanced non-linear load conditions in MATLAB/SIMULINK. The simulation results reveals that the active power filter is efficiently compensating the current harmonics and reactive power in the distribution network. The APF system is in compliance with the IEEE 519 and IEC 61000-3 recommended standards.