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Severe harmonic distortion, due to unintentional series or parallel resonance of the passive filters or power factor correction capacitors, is a significant issue in the industrial power system. The transformerless hybrid active filter, which operates at reduced kVA rating and switching ripples, is a promising filtering solution in high-power applications. This paper presents resonant current regulation...
As a compromise between economy and good performance, this paper adopts the combined system using active power filter (APF) and static var compensator (SVC) to compensate reactive power and harmonic currents simultaneously. The SVC is constructed by fixed capacitor (FC) and thyristor controlled reactor (TCR), and the APF is constructed by a voltage source converter and its filter reactor. SVC acts...
Harmonic voltage amplification, due to unintentional series or parallel resonance of power factor correction capacitors, is a significant issue in the industrial power system. Conventional active filters intended to compensate the harmonic current producing by nonlinear loads would not be an effective solution in this scenario, and the harmonic voltage may still be significant. This paper proposes...
Based on the analysis on the common methods to handle the Var impact in the system where harmonic exists, a new method is proposed, which can play a profound role in solving Var impact. Through test and practical application, the method deserves promotion in this regard.
A new high capacity comprehensive compensation system based on APF (active power filter) and capacitors is proposed to meet the requirements of harmonic elimination and reactive power compensation in low-voltage distribution power system, where APF is used to cancel the harmonic current and the capacitors are used to compensate the fundamental reactive power. Then the mathematical model of APF is...
This paper presents the required harmonic power and rating issues of the active filter and power components. A design procedure is presented to select the DC bus capacitor that covers all modes of operation. The effect of the DC bus ripple on the compensation capacity is analyzed. A typical problem is included to illustrate the design approach followed by simulation results showing the static performance...
The model and the normal control method of the cascaded H-bridge active power filter is described firstly in this paper. However, problems exist in the normal control. One of the main problems is the unbalance of DC capacitor voltages of the H-bridge units. In this paper, an improved method for DC capacitor voltages control of the cascaded H-bridge active power filter is presented. With slightly shifting...
In order to compensate more reactive power and lower the power level of the active power filter (APF), a hybrid filter system based on a combination of an APF and a thyristor switched capacitor (TSC) is presented. This system combines the good dynamic compensation performance of the APF and higher power level of the TSC. It can eliminate harmonics and compensate the power factor effectively in power...
The topology of an active power filter is proposed for the electrified railway power supply system, which can compensate the load's negative, reactive and harmonic current, and is suitable for the system adopting asymmetrical transformer. The filter is consisted of two single-phase 4-quadrant converters connected back to back through the DC-link capacitor. Decoupled by the capacitor, the converters...
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