Judgment and Suppression Methods for DC-Link Voltage Sag of Quasi Z-Source Inverter
Xu Yuhao1, Xiao Haifeng1, Ma Zhao1, Gao Wen1, He Yuyao2
1. School of Electronics Engineering Xi’an Aeronautical University Xi’an 710077 China; 2. School of Marine Science and Technology Northwestern Polytechnical University Xi’an 710072 China
Abstract The quasi Z-source inverter is a special boost converter with ability of short-circuiting the bridge arm in the same phase. It has a wide application prospect in new energy electric vehicles and distributed generation systems, such as photovoltaic and wind power systems. However, there is a potential problem when the DC-link voltage is boosted, i.e., the inductor on the dc-side of inverter with insufficient energy storage will make the diode current discontinuous. This will lead to DC-link voltage sag, a phenomenon that seriously reduces the output performance and safety and reliability of the quasi Z-source inverter. To solve this problem, the definition of voltage sag depth is firstly proposed to calculate and measure the rise and fall amplitude of DC-link voltage. Secondly, based on the comprehensive analysis of the factors causing the diode current interruption, a method for judging DC-link voltage sag is proposed. It can be used to predict whether DC-link voltage drops or not according to the system parameters and state. Thirdly, to prevent the quasi Z-source inverter from operating in the abnormal state, a method for suppressing DC-link voltage sag is proposed based on the idea of system coordinated control. The results indicate that the proposed method can accurately predict the conditions of DC-link voltage sag and effectively avoid DC-link voltage sag.
Xu Yuhao,Xiao Haifeng,Ma Zhao等. Judgment and Suppression Methods for DC-Link Voltage Sag of Quasi Z-Source Inverter[J]. Transactions of China Electrotechnical Society, 2022, 37(14): 3688-3700.
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2022, Vol. 37 
