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This paper studied mathematical model of doubly-fed induction generator (DFIG) based wind turbine generation system under unbalanced voltage. A dual-PI current control strategy was proposed to improve the performance of DFIG's rotor side convert (RSC) under asymmetrical voltage condition. The symmetrical component theory is employed to decompose asymmetrical three-phase variable such as voltage and...
A novel main circuit topology of current quality compensator is proposed in this paper, which is composed of PWM rectifier and cascade H bridge inverter. The three phase inverters are decoupling controlled. PWM rectifier is adopted to maintain the dc-bus voltage stably for the device, the later inverter is composed of cascade H-bridges. The inverter side is controlled by carrier phase shifting and...
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...
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