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This paper introduces the mathematical model of a double boost circuit for the condition that the short circuit to ground happens to one phase of inverters, taking into account the impact of leakage inductance of power transformers. The corresponding energy transmission modes are analyzed, mainly focusing on the reason why the rectifier diode reverses voltage and the DC bus voltage rises. Then a novel...
This paper proposes a novel analytical approach for accurate calculation of IGBT losses in rectifier and inverter, aiming to improve the appropriate selection process of IGBTs and the design of power electronic radiator devices. A 1140V/75kW variable frequency speed control system is investigated and the IGBTs selection is performed considering the effects of gate drive resistance and DC bus voltage...
According to the DC bias problem of AC power network, this paper puts forward the new type power transformer based on two-phase magnetic materials, which uses flux of two-phase magnetic materials to counteract flux of DC bias. In order to get variable stable flux of two-phase magnetic materials, intelligent control system is proposed with PWM controlled rectifier and detecting circuit of peak value...
This paper uses the improved feed forward control strategy to design a PWM rectifier control system. It overcomes the power network fluctuation and the effect of load disturbance. The simulink model of the system is built and compared to the traditional PWM rectifier. The result shows that the improved PWM rectifier can get a steady DC-Bus output voltage rapidly and a good robustness.
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