The problem of oversimplification and improper selection of DC model, which exists in the DC modeling when AC and DC systems interact in AC/DC hybrid power system, is discussed.
讨论了目前研究交、直流混合电网交直流系统相互作用时在直流建模上存在的模型过度简化及模型选用不恰当的问题；
The paper gives two kinds of approaches to measure the ripple current in input current of DC-DC converter or DC-AC inverter.
文中叙述了直流—直流变换器或直流—交流逆变器输入电流中纹波电流的二种测量方法。
The design of hardware circuit is introduced, include DC-DC main circuit, DC-DCs sample circuit, DC-AC main circuit and DC-AC's sample circuit, and so on.
本文首先给出了一个整体的设计方案及其工作原理，并介绍了各个部分硬件电路的实现，包括DC-DC主电路、DC-DC的采样与给定、DC-AC的主电路以及DC-AC的驱动与采样等。
The design of hardware circuit is introduced, include DC-DC main circuit, DC-DCs sample circuit, DC-AC main circuit and DC-AC's sample circuit, and so on.
本文首先给出了一个整体的设计方案及其工作原理，并介绍了各个部分硬件电路的实现，包括DC-DC主电路、DC-DC的采样与给定、DC-AC的主电路以及DC-AC的驱动与采样等。
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