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An integrated mathematical model of voltage source inverter (VSI) under two types of closed loop control methods is proposed based on the analysis of operating principle of hybrid active power filter (HAPF). Then the integrated mathematical model of HAPF is presented based on the integrated model of voltage type inverter. Furthermore, the closed loop control characteristics of HAPF are discussed....
Harmonics and switching frequency cause a major problem in power system. A novel harmonic elimination technique and low switching frequency in a three-phase pulse width modulation (PWM) inverter are proposed in this paper. This inverter is associated with a LC filter. The technique determines the commutation angles based by solving a set of nonlinear system equations. This commutation angles are determined...
Three-level NPC inverter has been put into practical use for years especially in high voltage high power grid. This paper researches three-level active power filters(APF). In this paper the mathematical model in d-q coordinates is presented for 3-phase 3-wire APFs. The dead-beat control scheme is obtained by using the state equations. Canceling the delay of one sampling period and providing the predictive...
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