不同控制策略下含直驱机组风电场的系统电压稳定研究

运行连续潮流计算的PV及VQ曲线法,对不同控制策略下含直驱机组风电场的系统静态电压稳定性进行了研究。通过对新疆一个实际地区电网进行仿真计算,绘制了直驱风电机组构成的风电场分别采取恒功率因数为1、恒功率因数为0.99、恒功率因数为-0.99及电压控制模式下地区电网电压中枢点、重要变电站、风电场公共接入点(point of common coupling,PCC)的PV曲线及VQ曲线。通过仿真分析可以得出,当风电场在处于低出力水平时,电网的静态电压稳定性较好;在风电场注入功率较大时,电网无功裕度减少,导致电网静态电压稳定性降低。直驱机组风电场采取恒电压控制策略要优于恒功率因数控制策略下的电网静态电压稳定性。

Research on Voltage Stability of Power System Including D-PMSG Wind Farm with Different Control Technologies

The P- V curve and V- Q curve methods are generally applied to research on the steady -state voltage stability in- cluding D - PMSG wind farm with different control strategies. By means of simulating a certain regional power grid located in Xinjiang Uygur Autonomous Region, the P - V curves and V- Q curves at the point of common coupling, the key buses and important substations are plotted while wind farm respectively using constant power factor 1, power factor 0.99, power factor - 0.99 and constant voltage control strategies. It can he seen from the simulation results that the steady - state voltage stability is better while the wind farm is in low power; but when wind farm output level is high, the steady - state voltage of power sys- tem is decreasing. And the steady - state voltage of power system including D - PMSG wind farm with constant voltage control strategy has the precedence over that with the constant power factor control strategy.