基于等效开环过程的双馈风电场并网宽频振荡量化分析

A Wide-band Oscillation Analysis Method for DFIG Connected Power System Based on Effective Open-loop Process

为研究双馈风电场(doubly-fedinductiongenerator,DFIG)并网系统宽频振荡问题,该文基于多变量系统等效开环过程理论(effectiveopen-loopprocesstheorem,EOP)对DFIG并网系统宽频振荡进行量化分析。首先从控制理论的角度推导并建立了基于EOP的DFIG并网系统的闭环频域模型,然后根据建立的频域模型,推导了基于谱半径函数的双馈风电并网系统宽频振荡稳定性判据和基于EOP的振荡风险量化分析指标。仿真验证表明,提出的稳定性判据可以正确判断DFIG并网系统稳定性和振荡频率;提出的振荡风险量化指标可以有效衡量系统振荡风险,对工程实际有一定指导意义和应用价值。

To address the wide-band oscillation of the doubly-fed induction generator(DFIG) connected power system, a quantitative analysis method for the wide-band oscillations of the DFIG connected power system was proposed based on the effective open-loop process theorem(EOP). Firstly, the closed-loop frequency domain model of the DFIG connected power system based on EOP was established from the perspective of control theory. Then, based on the established frequency domain model, the spectral radius function based broadband oscillation stability criterion and EOP based oscillation risk index for the DFIG connected power system was derived. Time-domain simulation results show that the stability criterion proposed can correctly judge the stability and oscillation frequency of the DFIG connected power system, and the quantified oscillation risk index proposed can effectively measure the system oscillation risk.