Sliding mode control with fixed switching frequency for four-wire shunt active filter
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Date
2011
Journal Title
Journal ISSN
Volume Title
Publisher
The Korean Institute of Electrical Engineers
Abstract
The present paper proposes a sliding mode control with fixed switching frequency for three-phase three-leg voltage source inverter based four-wire shunt active power filter, to improve phase current waveform, neutral current mitigation and reactive power compensation in electric power distribution system. The performed sliding mode for active filter current control is formulated using elementary differential geometry, and the discrete control vector is deduced from the sliding surface accessibility using the Lyapunov stability. The problematic of the switching frequency has been treated considering hysteresis comparators for the switched signals generating. In this way, a variable hysteresis band has been established as a function of the sliding mode equivalent control and a predefined switching frequency in order to keep this one always constant. The proposed control has been verified with computer simulation which showed satisfactory results for the above objectives
Description
Keywords
Current harmonics compensation, Four-wire active filter, Sliding mode control, Switching frequency, Discrete Control, Electric power distribution systems, Elementary differentials, Equivalent control, Filter current control, Fixed switching frequency, Four-wire, Hysteresis comparator, Lyapunov stability, Neutral currents, Phase currents, Reactive power compensation, Shunt active power filters, Signals generation, Sliding modes, Sliding surface, Variable hysteresis band, Voltage source inverter