基于改进灵敏度分析的有源配电网智能软开关优化配置

随着大量间歇性分布式电源(DG)不断渗透到配电网中,电压越限和双向潮流等问题变得越发严重.智能软开关(SOP)是一种柔性电力电子装置,安装在配电网中用来替代传统联络开关,可以实现快速电压调节和准确潮流控制,从而有效解决DG所带来的相应问题.然而,SOP的投资成本较高,使得SOP选址定容问题显得尤为关键.文中提出一种基于改进灵敏度分析的有源配电网SOP优化配置方法.首先,结合DG出力的时序变化特性,从改善电压分布的角度采用改进灵敏度分析方法优化SOP选址;其次,采用二阶锥规划算法求解在改进灵敏度计算下的SOP选址定容优化模型;最后,在改进的IEEE 33节点配电系统上,对文中提出的优化方法进行分析与验证.算例结果表明,采用文中提出的方法对SOP进行优化配置可有效节省配电网年度综合运行成本和改善系统电压,有利于提高有源配电网运行的经济性和可靠性.

Optimal Allocation of Soft Open Point in Active Distribution Network Based on Improved Sensitivity Analysis

As a large number of intermittent distributed generators (DGs) keep penetrating into distribution networks, the problems such as voltage violation and bidirectional power flow become more and more serious. Soft open point (SOP) is a flexible power electronic device that is installed in distribution networks to replace the traditional tie switch. It can realize fast voltage regulation and accurate power flow control, thus effectively solving the corresponding problems caused by DGs. However, the high investment cost of SOP makes the SOP siting and sizing problem particularly critical. An SOP optimal allocation method in active distribution networks based on improved sensitivity analysis is proposed. Firstly, combined with the timing variation characteristic of DG output, an improved sensitivity analysis method is used to optimize the SOP location from the perspective of improving the voltage distribution. Secondly, the second-order cone programming algorithm is used to solve the SOP siting and sizing optimization model under improved sensitivity calculation. Finally, the proposed optimization method is analyzed and verified on the modified IEEE 33-bus distribution system. The results of the case study show that the SOP optimal allocation method proposed in this paper can effectively save annual comprehensive operation cost of distribution networks and improve system voltage, which is beneficial to improve the economics and reliability of active distribution network operation.