Abstract
This paper presents a non-iterative technique that generates reference current to manage operation of a three-phase four-wire shunt active power filter which employs a three-leg split capacitor voltage source inverter (VSI) topology. The proposed technique integrates together a self-tuning-filter (STF) and direct-quadrature-zero (dq0) principle (referred here as STF-dq0), allowing the controlled shunt active power filter (SAPF) to perform effectively under distorted source voltages and unbalanced load conditions. Unlike the previous technique developed based on the standard dq0 principle, the proposed technique does not require any service from a phase-locked loop (PLL) where two STFs are applied to separate harmonic and fundamental elements for the purpose of generating synchronization phases and reference current, respectively. Simulation work which includes connection of the SAPF circuits, design of control techniques and all the necessary assessments are conducted in MATLAB-Simulink platform. Performance achieved by the SAPF while utilizing the proposed technique is thoroughly investigated and benchmarked with that demonstrated by the SAPF while using the standard dq0 technique, to evaluate the inherent advantages. Exhaustive simulation results are provided and thoroughly discussed to support design concept, effectiveness, and benefits of the proposed technique.
Highlights
Ensuring good quality of power supply is often a challenging task due to ever-increasing usage of power electronics products
The viable solution is by using active power filter (APF) connected in parallel to the polluted power system
The good thing about shunt active power filters (SAPFs) is that they are able to deal with unbalanced issues in the source current along with mitigating harmonic current and compensating reactive power
Summary
Ensuring good quality of power supply is often a challenging task due to ever-increasing usage of power electronics products. In three-phase four-wire system, connection of single-phase loads and unequal loads distribution across the three phases causes excessive neutral currents These power quality issues can partially be solved by applying passive filter. Large amount of time will be spent just for the tuning purposes, and not worthwhile to be implemented Another inherent weakness of the standard dq0 technique is that it requires the service of an additional phase-locked loop (PLL) circuit to perform dq0-frames transformation and subsequently synchronize reference current with that of the operating power system. A technique to generate reference current (named as STF-dq0) for a three-phase four-wire SAPF without needing any service from a PLL is proposed. We present power circuit arrangement of SAPF and control techniques applied in this work.
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