针对 UPFC拓扑结构变化复杂的特点 ,通过引入开关函数的概念 ,建立了可反映 UPFC内部特性的统一的暂态过程的数学模型 ,与开关管动作时序、控制参数相结合可描述 UPFC及其控制系统的动态过程。将其应用于 IEEE First Benchmark Model,对 UPFC的暂态数学模型及其阻尼次同步谐振的控制策略进行了时域仿真计算 ,结果表明了暂态数学模型和控制策略的正确性。 Aiming at the characteristics of complex UPFC topology changes, by introducing the concept of switch function, a mathematical model of uniform transient process that can reflect the internal characteristics of UPFC is established. Combining with the switch timing and control parameters, UPFC and its control system The dynamic process. Applying it to the IEEE First Benchmark Model, the transient simulation of UPFC and the control strategy of damping subsynchronous resonance are simulated in time domain. The results show that the transient mathematical model and the control strategy are correct.