风光接入对电力系统电压稳定性的影响分析

Analysis on Influence of Grid-Connected Wind Farm and Photovolatic Power Station on Voltage Stability of Power System

研究光照强度突降、风电机组脱机及光伏电站和风电场同时切除等扰动对电网电压稳定性的影响。仿真结果表明,并网光伏容量达到一定上限值时,光照强度突降至零会使负荷母线电压跌落至限定值以下;风速突降或其它故障导致风电机组切除也会导致母线电压跌落至限定值以下;光伏电站和风电场同时切除后,母线电压值跌落更快,造成系统电压失稳;系统发生短路故障时,在风电并网点投入并联电容补偿装置能缓解电压跌落情况。

This paper studies the influence of disturbances such as sudden light intensity drop, wind turbine off-line and simultaneous cutoff of photovoltaic power station and wind farm on the voltage stability of the power grid. The simulation analysis results show that when the grid connected PV capacity reaches a certain upper limit, the sudden drop of the light intensity to 0 will cause the load bus voltage to fall below the limit value. Wind speed dips or other faults that cause the wind turbine to be cut off can also cause the bus voltage to drop below the limit. After the photovoltaic power station and the wind farm are cut off simultaneously, the bus voltage value drops faster, causing the system voltage instability. When a short circuit fault occurs in the system, a shunt capacitance compensation device at the wind power grid connection point can mitigate the voltage drop.