地区电网无功电压最优控制

OPTIMAL CONTROL OF REACTIVE POWER AND VOLTAGE FOR DISTRIBUTION SYSTEMS

本文提出了地区电网在满足母线电压、线路及变压器不超载的安全约束下,以有载调压变分接头和母线无功补偿量为控制变量,用线性规划获得计入无功电压静态特性的无功电压最优控制策略的方法.本文根据实时采样数据辨识负荷母线的无功电压静态特性,并有网损最小、无功补偿量最小、控制效益最大、三种不同的目标函数可供不同需要选用.在IEEE试验和实际系统的试验表明:能快速获得不同目标函数的最优控制策略.

According to the characteristics of distribution systems,this paper proposes a real-time algorithm for solving the optimal control strategies of reactive power and voltage in distribution systems.Under the conditions of bus voltage,branch reactive power used as controlled variables and the setting of the Tap Changing Under Load Transformers,reactive power compensation used as control variables, the strategies are gotten by using Linear programming in accordance with the requirements of real-time control. There are several different objective functions in the paper.That is.(1)minimum real power losses;(2)minimum reactive power compensation;(3)maximum control gain.The objective functions mentioned above can be choosed in the light of specific circumstance.The paper can follow the sample date in the real-time control, simultaneously,identify the reactive power-voltage static characteristic on load bus and consider its influence upon the optimal strategies. The proposed technique has been tested on the IEEE 5-bus,6-bus,modified, 30-bus and Jiaxing distribution system(41-bus)in Chian,on the personal computer. The optimal control strategies for different objective function mentioned above are obtained rapidly.