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At present, the One-Cycle Control of Active Power Filter has two serious problems. One is that this method can just compensate the harmonic and reactive power at the same time, which can not be eliminated separately. The other is that the tracking current will be affected and have huge error when the mains voltage appears distortion. So, through the hard work, in this paper, we adopt the method to...
In this work, a predictive current control algorithm of an active filter built with multilevel diode clamped inverter is developed. Cycle by cycle current optimization is achieved through current prediction based on converter switching states and system parameters. The presented current control algorithm is naturally applicable to converters with an arbitrary number of levels with constant computational...
An improved hybrid current control algorithm is presented for active power filter (APF) to compensate the harmonic current in three-phase four-wire asymmetric power system. Based on the analysis of the circuit structure of three-phase four-leg APF, the feasibility of hybrid current control is described in this paper. The method of instantaneous value comparison by timing control based on voltage space...
In accordance with the advantage of conventional hysteretic current control method, this paper advances a novel control method for active power filter (APF). In conventional hysteretic current control, the hysteretic band (HB) is fixed and actual compensating current is limited in a fixed hysteretic band. When the voltage source inverter (VSI) works in high-frequency state, as the switching frequency...
This paper presents a detailed study on the design and analysis of user-defined constant switching (UDCS) frequency current-control-based four-leg distribution static compensator (DSTATCOM). The three phase legs of its voltage source inverter are operated in hysteresis current tracking mode whereas the fourth leg is controlled by a square switching pulse of user-defined frequency. Consequently, the...
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