Static synchronous series compensator （SSSC） is capable of fast power flow control, and choosing advanced control strategy is crucial for achieving the function. In this paper the mathematical model is presented for SSSC in a synchronously rotating d-q frame by using Park＇s transformation, in which the inverter loss and the dynamic regulating process of the DC link capacitor voltage are considered. And the decoupling strategy for d-q axes based on partial states feedback is proposed, meanwhile the control strategy for transimssion line active power and DC link capacitor voltage are proposed. The mathematical model of the SSSC and the simulation model of control system are built in the Matlab/Simulink dynamic simulation platform. A studying example for simulating the regulating process of transmission line active power and DC link capacitor voltage and the transient stabilization is carried out to illustrate the flexibility, adaptability and feasibility of the proposed method and models.%静止同步串联补偿器（SSSC）具有快速潮流控制的能力，选择好的控制策略能够充分发挥SSSC的作用。本文计及逆变器的损耗及直流侧电容电压的动态调节过程，在两相同步旋转dq坐标系下建立了SSSC的数学模型。在分析此模型的基础上提出了基于部分状态反馈的dq轴解耦策略，同时还提出了直流侧电容电压和线路有功功率的控制方法。在Matlab／Simulink动态仿真环境中搭建了SSSC的数学模型及控制系统的仿真模型，并基于该模型对直流侧电容电压调节过程、线路传输有功功率的调节过程和SSSC的暂态过程进行了仿真，仿真结果表明该控制策略的有效性和适用性。
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