并联型无源与有源次同步振荡阻尼装置对比分析

Comparative analysis between parallel-type passive and active subsynchronous oscillation damping devices

提出了并联型FACTS装置抑制次同步振荡的无源阻尼与有源阻尼的概念。以静止无功补偿器和全控型换流器作为实现方法。采用复转矩系数法,分别推导了机端接入方式下,2种次同步振荡阻尼方法提供的阻尼系数和正阻尼条件,对比了影响二者提供正阻尼大小的相关因素。分析结果表明,无源阻尼的大小与阻尼装置接入点系统电压大小成正比,有源阻尼的大小则不受接入点电压大小的影响,而主要与其自身产生的次同步电压大小成正比。采用机端阻尼控制方式,分别对2种阻尼装置的控制器进行了设计。采用测试信号法,通过相位补偿,分别对阻尼装置提供的正阻尼进行了优化。时域仿真结果表明,对于短路故障引起的次同步振荡,在装置容量相同的情况下,有源阻尼方法较无源阻尼方法具有更强的阻尼能力。

The concepts of passive damping and active damping of parallel-type FACTS for SSO（SubSynchronous Oscillation） suppression are proposed. Static var compensator and fully controllable converter are adopted for their implementation. The complex torque coefficient approach is applied to respectively derive their electrical damping coefficients and the positive damping conditions in terminal connection mode. The correlative factors influencing the magnitude of their positive damping are compared. The analytical results indicate that,the magnitude of passive damping is proportional to the system voltage of connection point,while the magnitude of active damping,immune to system voltage,is mainly proportional to the subsynchronous voltage produced by it. The controller is designed in the generator terminal control mode for two damping devices respectively. The test signal method is applied to optimize the supplied positive damping by phase compensation for two damping devices respectively. The time-domain simulation reveals that,with the same capacity,the active damping device has better SSO damping capability than the passive damping device in the case of short circuit fault.