基于源网电压差值法的220kV电厂电压曲线优化制定

Voltage Curve Optimally Developing of 220kV Power Plant Based on Voltage Difference between Generation and Grid

发电厂的电压控制是电网运行安全性和经济性的基础。本文以电网有功损耗最小为目标,分析了无功负荷在发电厂和电网之间最优分配方式,揭示了发电厂实现最优无功出力的影响因素,提出了反映电厂电压控制与系统调压需求相匹配的评价指标,即电厂高压母线与枢纽母线之间的源网电压差值。并通过分析影响该指标取值的变量,优化计算,从而获取电网在不同运行方式下电压差值的最优值;进而对不同运行方式下最优电压差值进行局部统一、分档差异化处理;最后结合枢纽母线电压的预测值,进行发电厂日电压控制曲线的优化制定。算例结果证明了该方法简单实用,而且无功优化效果好。

Voltage control of power plants is the basis for safe and economic operation of powergrid.On the purpose of minimizing the active power loss in power grid,the optimal allocation ofreactive load between a220kV power plant and power system is analyzed.This article shows theaffecting factors of the optimal reactive power of power plant.It also put forward the evaluation indexwhich reflects the matching between the voltage control of power plant and the voltage-regulatedemand of power system,namely,the voltage difference between generation and grid(VDGG).Andthen,by controlling the values of variables that affect the VDGG,the article adopts an optimalmathematical model to obtain the optimal VDGG under different operation modes of power grid.Afterdifferently and uniformly dealing with the optimal VDGG,the daily voltage curve of power plant isoptimally developed combined with the predictive voltage of the hinge bus.The effectiveness of themethod is verified by case study,which achieves simple and practical effects of reactive power optimization.