基于SNOP的柔性配电网中分布式电源最大准入容量计算

Allowable DG Penetration Capacity Calculation of SNOP-based Flexible Distribution Network

分布式电源高比例接入配电网,将会引起配电网潮流越限等问题,影响配电网安全运行。基于智能软开关的柔性配电网为提高分布式电源消纳能力提供了新的思路。智能软开关的动态双向功率调节能力,有助于改善配电网中电压瓶颈节点和传输容量瓶颈支路的运行状态,实现全网潮流主动协同管理,从而提高柔性配电网中分布式电源准入容量。首先建立了柔性配电网中分布式电源最大准入容量模型,基于配电系统的多节点特性,该模型属于高维非线性优化问题。然后根据实际场景和参数设置的不同,分为传统配电网中分布式电源固定节点位置、柔性配电网中分布式电源固定节点位置、柔性配电网中分布式电源自由接入3种情况进行分析,并采用多种群遗传算法求解得到全局最优解。最后使用IEEE 33节点配电系统进行算例分析,结果验证了柔性配电网中智能软开关的应用对分布式电源接入能力的提升作用。所提方法在获得柔性配电网中分布式电源准入容量的同时,可从规划角度得到分布式电源接入的最优容量和位置。

The introduction of high-capacity DG into the distribution network will break through the power flowlimit,and also affects the safe operation of distribution network. SNOP-based flexible distribution network provides a newway for improving the allowable DG penetration capacity. With bidirectional power regulation capability,SNOP helps to improve the bottleneck status of bus/branch in distribution network,achieves active regulation of power flow,and improves the DG penetration capacity. Firstly, this paper establishes the optimization model of DG penetration capacity in the flexible distribution network. Because of the large number of network nodes,the model belongs to high dimensional nonlinear optimization problem. Secondly,according to the actual scenario and parameter settings,the analysis is divided into three cases： 1） fixed position of DG in traditional distribution network,2） fixed position of DG in flexible distribution network,3）free access of DG in flexible distribution network. Next,MPGA is used to solve the problem,which can get the global optimal solution. Finally,a case of IEEE 33-bus distribution network is used for verification,the optimization result shows that the method not only helps to get the allowable DG penetration capacity,but also shows the best capacity/location scheme.