Abstract：This paper presents a DC-link voltage control strategy and implementation method for Z-source inverters. In order to expand the operation range of high-speed permanent magnet motor and improve the power supply efficiency, it is necessary to control the DC-link voltage of Z-source inverter in real time according to the operation states of the motor. The proposed strategy not only considers the DC-link voltage of the motor in steady state, but also designs the dynamic boost curve and adopts the corresponding non-linear controller to ensure the implementation effect. The proposed strategy coordinates the two main control variables in the Z-source inverter, i.e. shoot-through duty ratio and modulation index. Therefore, it ensures the stability of the system while achieving fast following and reducing the loss. In addition, a fuzzy PI controller based on the indirect control of capacitor voltage is used to control the DC-link voltage to suppress the system fluctuation caused by the change of the given value or the motor load. Besides, the proposed strategy can be applied to various conventional voltage PWM strategies of Z-source inverter. Experiments have verified the effectiveness of the proposed strategy.
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2020, Vol. 35 
