Flywheel energy storage system (FESS) is very important in the future for its high efficiency, energy saving and clean. Although there are some products in the market currently, the high-power FESS is still under investigation. A bidirectional DC-DC circuit applied in the high-power FESS was proposed in this paper, which used quasi-resonant zero voltage switching (QRZVS) technique and achieved the two-way flow of energy. The QRZVS had characteristics such as simplified structure and low switching loss, realized the ability of quick charge & discharge and reduced the electromagnetic interference (EMI) level of the system.%飞轮储能因其具有高效、节能、清洁等诸多优点，是未来重要的储能电源形式之一。虽然已有部分飞轮储能系统产品问市，但是大功率飞轮储能系统仍然处于研究之中。本文介绍了一个开发中的应用于大功率飞轮储能系统的双向准谐振软开关DC-DC变换器，有效实现了开关管的零电压开通和零电压关断。其突出的优点在于，结构精简及较低的开关损耗，在确保飞轮储能系统快速充放电的基础上，降低了整套系统的电磁干扰（EMI）水平。
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