中低压配电网电压优化调整

Optimal voltage regulation in middle-low voltage distribution network

以提高电压合格率和降低网络有功损耗为目标,通过调整变压器分接头和补偿电容器组,提出一种针对中低压配电网特点的电压优化调整方法。构造隶属度函数对全网电压进行模糊评价,减小数据的不确定性对优化结果的影响;评价结果计入目标函数,将电压约束条件转化为优化目标,即将“必须满足电压约束”转变为“尽量提高节点电压质量”。采用最大和最小2种负荷方式计及较长时间段内负荷的变化。根据灵敏度信息确定电容器补偿位置,通过禁忌搜索求解组合优化问题。实际配电网优化计算结果表明,该方法能以每年几次的调节频率,在负荷的全年变化范围内有效提高电压合格率并降低网络损耗。

To improve the voltage profile and reduce the power loss in middle-low voltage distribution network, an optimal voltage regulation method is presented with adjusting transformer taps and capacitors. The heaviest and the lightest load operating conditions are used in the optimization process for wide range of load variation. A membership function is set to evaluate the voltage quality, and the influence of uncertain data on optimization results can be decreased. The voltage quality evaluation is a part of the objective function, thus the voltage constraint is changed from a restriction into an objective. That is, 'to ensure voltage profiles eligible' is converted into 'to regulate voltage profiles as good as possible'. Compensation sites are determined by the sensitivities. The combinational problem is solved by a Tabu search technology. The results of a practical network, improved voltage profile and reduced power loss, shows that this method is effective in wide-range of load-variation in a year by adjusting a few transformer taps and capacitors annually.