基于安全域的大规模风电并网系统低频振荡稳定分析

摘要

The impact of large-scale wind power integration on the oscillatory stability of power system is researched based on the security region method,the SSSR(Small Signal Stability Region) is compared between power system with DFIG(Doubly-Fed Induction Generator) and that with synchronous machine,and the mechanism of SSSR change is explored by time-domain simulation.The influences of the transmission distance as well as the active and reactive power control loop PI parameters of DFIG on the low-frequency oscillatory stability of power system are analyzed.Research shows that,the impact of integration of DFIG-based wind farm on the low-frequency oscillatory stability of power system is seriously affected by the transmission distance and the PI parameters of excitation control loop for DFIG;smaller P or I parameter brings less impact on,or even enhances,the low-frequency oscillatory stability of power system.%以安全域方法为基础,研究大规模风电并网对电力系统振荡稳定的影响,对比分析双馈风机替换同步机前后系统可保持小扰动稳定的运行区域的变化,并借助时域仿真探索小扰动稳定域的变化机理.分析输电距离、双馈风机有功控制回路与无功控制回路PI参数对系统低频振荡稳定性的影响.研究表明,双馈风电场并网对系统低频振荡稳定的影响受输电距离与双馈风机励磁控制回路的PI参数影响显著;较小的比例系数和积分系数则可降低双馈风电场对系统低频振荡稳定的不利影响,甚至改善系统的低频振荡稳定特性.