混合型补偿装置抑制风电次同步振荡的研究

传统风电经固定串补(FSC)外送系统常引发次同步振荡(SSO)问题,威胁系统的安全运行.基于风电串补系统SSO的发生机理,提出一种由静止同步串联补偿器(SSSC)与FSC组成的混合串联补偿(HSC)装置结构的附加控制策略.充分利用SSSC的控制灵活性,使其输出次同步电压与线路次同步电流同相位,SSSC等效为系统振荡频率...

Research on Hybrid Compensation Device for Suppressing Wind Power Sub-synchronous Oscillation

The sub-synchronous oscillation (SSO) problem often arises in the traditional wind power transmission system with fixed series compensation (FSC), which threatens the safe operation of the system. Based on the occurrence mechanism of wind power series compensation system SSO, a hybrid series compensation (HSC) device structure and control strategy composed of static synchronous series compensator (SSSC) and FSC is proposed. The control flexibility of SSSC is fully utilized to make its output sub-synchronous voltage and circuit sub-synchronous current in the same phase, and SSSC is equivalent to the positive resistance at the system oscillation frequency. HSC device is used to lift the total resistance of the system to a positive range, so as to avoid SSO. The structure and principle of HSC supplementary sub-synchronous damping control (SSDC) strategy were introduced, and the parameter tuning method was given. Based on PSCAD/EMTDC platform, a time-domain simulation model of a practical wind power transmission system via HSC in North China was built. The simulation results show that the HSC device can effectively suppress SSO and ensure the stable operation of the system. The stability of the system can be enhanced by keeping the line series compensation constant and improving the SSSC compensation.