High power, zero ripples active filtering system with power modules operating in parallel

Abstract

The paper present the model based predictive controller for ripple free, high power active filter (APF) with LCL circuit. The system suppresses LCL resonance and provides control dynamics limited only by circuit parameters. The inverter of an active power filter requires a high PWM switching frequency, therefore high power application has to be realized by using several power modules operating in parallel. There are presented simulations and experimental results achieved for APF system of the rated power 1.2MVA with four 300 kVA power blocks operating in parallel.

Research on PI and repetitive control strategy for Shunt Active Power Filter with LCL-filter

“…We use lead compensator 3 z to compensate one beat delay and phase lagging of the control plant. W The resonant peak threatening stability of system can be suppressed by a notch filter, so we choose 1 ( 2 )/4 z z − + + .…”

“…As a result, the system has a poor current tracking performance. On the contrary, novel LCL-filter manner [2] [3] can achieve a better filtering effect and faster dynamic response with smaller inductors and filter capacitors.…”

Fast-Transient Repetitive Control Strategy for a Three-phase LCL Filter-based Shunt Active Power Filter

“…Traditional passive power filters are gradually being replaced by active power filters (APFs) [1]. A novel APF with an LCL filter [2]- [4] can minimize the amount of distortion current in the utility grid and achieve a fast dynamic response with small inductors and filter capacitors.…”