基于SVG的直驱风电场次/超同步振荡影响因素分析

ANALYSIS OF INFLUENCING FACTORS OF SUB/SUPER-SYNCHRONOUS OSCILLATION OF DIRECT-DRIVE WIND FARM BASED ON SVG

针对中国西部某直驱风电场发生的次/超同步振荡现象,该文在Matlab/Simulink软件上搭建聚合风电机组并网系统模型,结合阻抗分析法研究SVG的稳态工作点、锁相环、交流电流环直流均压控制对系统阻抗特性及稳定性的影响,最后进行仿真验证。结果表明:随着SVG输出功率增加,系统的稳定性逐渐降低;随着SVG锁相环带宽增加,系统稳定性逐渐降低;随着电压环带宽增加,系统稳定性逐渐降低;随着SVG电流环带宽减小,系统的稳定性降低。

Aiming at the sub/super-synchronous oscillation phenomenon occurring in a direct driving wind farm in Western China,the grid connected system model of aggregation wind turbine is established on the Matlab/Simulink software in this paper.Combined with the impedance analysis method,the influences of SVG steady-state operating point,phase-locked loop,AC current loop and DC voltage sharing control on the impedance characteristics and stability of the system are studied.Finally,the simulation verification is carried out.The results show that the stability of the system decreases with the increase of SVG output power.With the increase of SVG PLL bandwidth,the system stability gradually decreases.With the increase of voltage loop bandwidth,the stability of the system decreases gradually.With the decrease of SVG current loop bandwidth,the stability of the system decreases.