摘要
对抽水蓄能站对电网负荷稳定性进行合理控制,可减轻抽水蓄能站的总负荷,使蓄水站稳定运行。对电网无功电流进行控制是整个电网负荷稳定性控制的关键,需要计算蓄水站正常运行时电网的电流无功功率平衡关系方程,组建抽水蓄能站电网无功电流控制模型,但是传统方法通过减少电压畸变或电流畸变,消除不同控制参数对抽水蓄能站电网负荷的影响实现稳定性控制,不能对负荷控制最关键的电流无功功率平衡关系进行有效分析,无法建立精确的无功电流控制模型,降低了电网负荷稳定性控制的效果。提出一种双馈调速的抽水蓄能站电网无功电流控制方法,对电网负荷稳定性优化控制。用上述方法先计算出电网无功功率的控制参考量,得到波动性负荷或可再生能源发电功率的测量值与预测值之差,通过增添附加项用于电网振荡阻尼,给出发电模式下电网的电流无功功率平衡关系方程,组建抽水蓄能站电网无功电流控制模型,利用改进模型对抽水蓄能站电网无功电流控制,完成电网负荷稳定性优化控制。仿真结果表明,改进方法可以有效地实现对抽水蓄能站对电网负荷稳定性优化控制,误差小且鲁棒性强。
A reactive current control model of power grid load for pumped storage station is proposed hased on double-fed speed governing. Firstly, the control reference quantity of grid reactive power is calculated to obtain the difference between measured value and predicted value of fluctuant load or renewable energy sources generated out- put. Then the addition item of oscillation damping in power grid is used, and the equilibrium relationship function of power grid electricity reactive power is obtained. The reactive current control model is built. Finally, the modified model is used to control the reactive current, and the optimization control of power grid is completed. The simulation results show that the modified method can achieve the optimal control of power grid. It has small error and strong ro- bustness.
出处
《计算机仿真》
北大核心
2017年第5期138-141,共4页
Computer Simulation
关键词
电网
抽水蓄能站:无功电流控制
Power grid
Pumped storage station
Reactive current control
