Hysteresis Current Control of the Single - Phase Active Filter
Journal Title: ANALELE UNIVERSITATII DIN CRAIOVA - Seria Inginerie electrica - Year 2013, Vol 37, Issue 37
Abstract
To compensate harmonic current components in case of unbalanced three-phase loads authors will propose a structure composed by three single phase active filters. To begin is implemented the single-phase active filter which will be included in the structure of three-phase active filter for harmonic compensation of unbalanced consumers. Using hysteresis control technique can achieve instant control between two limits, which impose offset signal to follow the estimated reference signal with some deviation estimated by choosing the loop bandwidth. The proposed scheme is implemented with hysteresis current controller with fixed band. To obtain a compensated current with a current ripple as low as possible, the value of hysteresis band should be small. This will lead to high switching frequencies and increasing the switching losses. Advantages of using hysteresis current control are excellent dynamic performance and the ability to control the amount of peak to peak ripple current in specified hysteresis bandwidth. To estimate the reference current the Instantaneous Reactive Power Extension Theorem was used because this theorem is suitable for single - phase active filter control. For testing the command and control strategy was used a single - phase voltage source inverter (full bridge). Using Matlab / Simulink was simulating the active filter model. After connecting of active filter, in point of common coupling, voltage source and current drawn from power supply have sinusoidal variation, are in phase and voltage and current total harmonic distortion is lower than permissible level of disturbances.
Authors and Affiliations
Aurel Botezan, Ioan Vadan, Silviu Stefanescu
Keywords
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