The DC-side static and dynamic behaviours of SPWM 2H-bridge inverters which act as the typical DC-side loads in many AC/DC/AC converter systems, have important influences on researches on modeling, control approach and static and dynamic character of their front converters. Thereby, it is necessary to study the DC-side equivalent model of the inverters and consequently reveal the load characters relative to their front converter systems. Based on building the mathematic model of the inverters, this paper deduces a DC-side equivalent mathematic model. Finally, via a great deal simulations and experiments, the validity of the model and its approximate simplified equivalent circuit model are confirmed.%在以SPWM-2H桥作为逆变器的AC/DC/AC变流系统中,逆变器作为系统直流侧的负载,其动静态行为,对其前端变流系统的建模仿真、控制方法与动静态性能研究具有重要的影响.因此,有必要对其直流侧等效模型进行研究,从而揭示其作为前端变流系统的负载特性.文章在建立SPWM-2H桥逆变器数学模型的基础上,推导出了逆变器直流侧等效数学模型.最后通过相关的仿真与实验工作,验证了本文所建立的SPWM-2H桥逆变器直流侧等效模型及其简化等效电路模型的正确性.
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