无功功率是交流电力系统设计和运行中的一个重要因素，它与电力系统的安全稳定和经济运行息息相关。

Reactive power is a crucial factor for the design and operation of ac power systems, and is closely bound up with the safety, stabilization, and economical operation of the power system.

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无功功率是交流电力系统设计和运行中的一个重要因素，为了减少电能损失，需要在电力用户端与电力系统的变电所内合理配置一定的无功补偿装置。

Workless power is an important factor in designing and running of alternating current system. A compensation device is needed in substation and the end users to save electricity.

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随着系统规模和复杂程度的不断增加，传统的小信号稳定分析已经不能满足电力系统规划、设计和运行的需要。

Due to large scale and complexity, conventional small signal stability analysis cannot meet the demand of plan, design and operation of the power grid.

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