基于回比矩阵的双馈风电机组多机稳定性分析

Multi-machine stability analysis of doubly-fed wind turbine based on return-ratio matrix

风电装机容量的持续增长给电力系统的安全稳定运行带来了新的挑战,为了分析风电接入含串联补偿的送出线路所引发的振荡问题,建立包含发电机、锁相环、机/网侧控制在内的单机阻抗模型,并通过单机、风电场内集电线路和送出线路进行风电场等效阻抗模型重塑和传递函数提取,然后基于回比矩阵特征值和广义奈奎斯特稳定性判据对多机稳定性进行分析判断,最后以三机系统为例,结合频域分析法和时域仿真法验证阻抗建模准确性和稳定性分析的有效性。

The continuous growth of wind power installed capacity has brought new challenges to the security and stability of power system.In order to analyze the oscillation problem caused by wind power access to transmission lines with series compensation,a single machine impedance model including generator,phase-locked loop and machine/network side control is established.The wind farm equivalent impedance model is reconstructed and the transfer function is extracted through the single machine,the collector line and the transmission line of the wind farm.Then,the multi-machine stability is analyzed and judged based on the eigenvalue of the return-ratio matrix and the generalized Nyquist stability criterion.Finally,taking three-machine system as an example,the accuracy of impedance modeling and the effectiveness of stability analysis are verified by frequency domain analysis and time domain simulation.