According the operation mechanics of the SCES system, its main circuit containing bi-directional DC-AC-DC converter was designed and its unified model was built.

从超级电容器储能系统的运行机理出发，设计了含双向DC - AC - DC变换器的超级电容器储能系统主电路结构，并建立了其统一模型。

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The low voltage DC system is one of the most important equipments in converter station, which is closely associated with the safety and stability of DC transmission system and correlative AC system.

低压直流输电系统是换流站内重要设备之一，直接影响到整个直流输电系统及相关交流系统的安全稳定运行。

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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。

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