广义相位补偿法在接入双馈风机电力系统的稳定器设计中的应用

Generalized Phase Compensation for PSS Design in Power Systems with DFIG Wind Turbines

为提高接入双馈风机的电力系统小干扰稳定性,对采用广义相位补偿法的电力系统稳定器(PSS)设计问题进行了拓展研究。基于同步系统中的广义相位补偿法,将广义相位补偿法推广到双馈风机并网系统中。采用广义相位补偿法能较容易地确定PSS的安装地点,并且能够分别计算每台同步机的补偿角度。此外,广义相位补偿法还将PSS的增益计算转化为简单的多项式优化问题。研究结果表明:当不稳定系统配置了由广义相位补偿法整定的PSS后,不稳定模态都移动到了左半平面的指定位置,系统小干扰稳定性得到显著改善。因此,应用广义相位补偿法在接入双馈风机的电力系统中进行PSS设计,对提高系统小干扰稳定性是可行、有效的。

In order to suppress low-frequency oscillations in power systems integrated with DFIG wind turbines, we investigated the extended application of the generalized phase compensation（GPC） principle. Based on the GPC principle in synchronous power systems, the GPC was expanded into systems with DFIG wind turbines. The advantage of the adopted method is the ability of locating PSS easily and computing compensation angle separately for each synchronous machine in power systems. In addition, computing PSS gain is simplified to a polynomial optimization problem with only several variables and constraints. The results show that, with PSSs tuned by GPC, unstable modes are moved to specified places in left half plane successfully, and small signal stability is significantly improved. In conclusion, it is feasible and effective to improve small signal stability of systems integrated with DFIG wind turbines, with PSSs designed by GPC.