2009•Dianli zidonghua shebeiRequires access

Direct power control of PWM rectifier based on virtual flux

Yongqi Tang

Abstract

Compared with VOC(Voltage-Oriented Control)of three-phase PWM(Pulse Width Modulation) rectifier,DPC(Direct Power Control)has quicker dynamic response and better anti-jamming performance. A DPC approach based on virtual flux is presented for three-phase voltage source PWM rectifier.The wor- king principle of PWM rectifier is analyzed and its mathematical models are established inα-βand d-q re- ference frames,based on which,its virtual flux model is also put forward with virtual flux conception. Since the reactive and active powers are calculated by estimating the virtual flux,AC voltage sensors at net side could be omitted.The control system has external closed-loop control of DC voltage output and internal closed-loop control of.power.Simulation results show that,the virtual flux based DPC system has simpler structure,fewer sensors,higher anti-jamming capability,lesser input current distort,better static and dy- namic control performances of instantaneous power than VOC system.

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Available abstract

Key concepts: PWM rectifier, Pulse-width modulation, Rectifier (neural networks), Control theory (sociology), AC power, Voltage, Power (physics), Flux (metallurgy)