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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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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准确地辨识同步电机参数，是研究分析电力系统运行和控制系统设计的前提。

It is the precondition for investigating power system running and controlling system design to determine the electromagnetic parameters of synchronous electric machine exactly.

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