水光互补系统规划与运行层面安全稳定影响分析

Analysis on Safety and Stability Impacts of Hydro-Photovoltaic Complementary Systems in Planning and Operation

中文关键词:容量配置  水光互补  水锤效应  仿真分析  安全稳定运行

keywords:capacity configuration  hydro-photovoltaic complementation  water hammer effect  simulation analysis  safe and stable operation

中文摘要:针对水光互补典型应用场景中可再生能源对电网安全稳定特性的作用机理问题，以西北某区域实际电网为研究对象，利用仿真软件，搭建基于改进的中国电力科学研究院36节点系统模型，并通过调整水光配比进行了稳态、静态、暂态多运行方案的对比分析。仿真结果表明：光伏投入可改善电网频率的稳定性，但同时会加剧电网电压的不稳定性；受扰动时，快速切除部分光伏也可改善电网频率的稳定性，且水电降出力配合光伏运行将使电网频率动态受水锤效应的影响减弱。

Abstract:Aiming at the mechanism of renewable energy affecting the safety and stability of the power grid in typical hydro-PV complementary scenarios， an actual power grid in Northwest China is taken as the research object. A modified 36-bus system model of China Electric Power Research Institute is built using simulation software， and comparative analyses of steady-state， static and transient state schemes are carried out by adjusting the hydro-PV capacity ratio. The simulation results show that PV integration can improve power grid frequency stability but aggravate voltage instability. Under disturbance， fast cutting-off part of PV capacity can also improve frequency stability， and coordinating hydropower output reduction with PV operation weakens the influence of water hammer effect on the dynamic frequency characteristics of the power grid.