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This paper aims to improve the fault-tolerant ability of doubly-fed induction generator based wind turbines (DFIG-WTs) by applying a four-switch three-phase (FSTP) topology based grid side converter (GSC). Once a switch breaks down in the three-phase GSC, the corresponding phase is connected to the midpoint of the DC bus to make the wind turbine (WT) continue working properly. The operation of the...
In this paper, a modulation and control method for the new transformerless unified power flow controller (UPFC) is presented. As is well known, the conventional UPFC that consists of two back-to-back inverters requires bulky and often complicated zigzag transformers for isolation and reaching high power rating with desired voltage waveforms. To overcome this problem, a completely transformerless UPFC...
A new solid state variable capacitor (SSVC) with minimum dc capacitance is proposed. A variable ac capacitor (with capacitance variable from 0 to Cac) is traditionally implemented by an H-bridge inverter and a large electrolytic dc capacitor with capacitance of 20 times the ac capacitance value, Cac to absorb the 2ω dc ripple. The proposed SSVC consists of an H-bridge and an additional phase leg connected...
This paper proposes a new single-phase high power factor rectifier, which features regulation by conventional PWM, soft commutation and instantaneous average line current control. A zero-voltage-switching pulse-width modulation (ZVS-PWM) auxiliary circuit is configured in the presented ZVS-PWM rectifier to perform ZVS in the main switches and the passive switches. Furthermore, soft commutation of...
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