Abstract
The interactions between shunt active power filter (APF) and capacitance load tend to result in stability problems and resonance. The conventional model of a shunt APF is not precise enough to reflect this phenomenon. To address it, this paper proposes a modified shunt APF system model to accurately reflect various stability problems. This paper also studies the mechanism of positive feedback resonance brought by capacitance load and proposes a modified hybrid controller to improve the stable margin of the system, making the shunt APF work stably under different working conditions where there are μF capacitors on the demand side. The correctness and validity of the proposed strategy are verified by simulation analysis and prototype experiments.
Highlights
An active power filter (APF) is a power electronic device that deals with harmonics, three-phase unbalanced loads, and reactive power compensation in a distribution network [1,2]
The topology structure of an active power filter can be divided into shunt APF topology and series
75kVAshunt shunt active power prototype wason built on a TMS320F28335 digital signal shunt active power filter prototype was built on a
Summary
An active power filter (APF) is a power electronic device that deals with harmonics, three-phase unbalanced loads, and reactive power compensation in a distribution network [1,2]. The topology structure of an active power filter can be divided into shunt APF topology and series. Since it is difficult for the series active power filter to protect against overcurrent, its application is very limited. The shunt active power filter is the one widely used in industrial applications. Compensation characteristics of both shunt APFs and series APFs are analyzed under harmonic voltage or harmonic current sources in [12,13]. It is pointed out that harmonic current is amplified when shunt APFs are compensating harmonic voltage sources. The problem of harmonic amplification exists when parallel capacitors are connected to a shunt APF system. Few papers focus on the resonance and system instability of a shunt
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