光伏并网系统在低电压穿越期间控制参数设置不当易造成自身脱网,尤其是在大规模光伏并网加剧电力系统电 力电子化程度的情况下,会显著降低系统暂态稳定性水平。为提升系统暂态稳定性,首先,基于光伏并网系统电压跌 落期间的运行方式,采用矢量图分析故障持续期间的系统暂态稳定特征;然后,采用多目标线性规划求解方法刻画有 功电流指令在暂态稳定约束下的绝对稳定区间,并基于该区间采用几何分析法确定光伏并网系统控制参数的最优区间; 最后,以江西某区域实际电网结构进行仿真分析,验证所提参数优化方法对系统暂态稳定性提升效果。
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