基于二阶网损无功灵敏度矩阵的配电网无功补偿选点

Optimal Location of Reactive Power Compensation for Distribution Network Based on Second Order Loss-Reactive Power Sensitivity Matrix

目前配电网无功优化规划多采用灵敏度分析等方法来确定配电网无功补偿点。传统的灵敏度分析方法以补偿前节点灵敏度来选择补偿点,依赖补偿前网络潮流,选出的点容易集中在重负荷支路,导致补偿范围重叠,无功补偿可能并非最优。为此,提出了二阶网损无功灵敏度矩阵的计算方法,并基于此提出了配电网无功补偿选点方法,考虑了后选补偿节点补偿容量对先选补偿节点灵敏度的影响。算例结果验证了该方法的有效性。

At present, in the reactive power optimization planning for distribution network the methods such as sensitivity analysis and so on are utilized to determine the location, where reactive power compensation devices are installed. In traditional sensitivity analysis method the pre-compensation nodal sensitivity is used to choose the location for reactive power compensation, so it depends on the pre-compensation power flow and the chosen compensation locations are frequently concentrated upon the branches with heavy load, and it leads to the overlap of compensation ranges and possibly the effect of reactive power compensation is not the optimal. For this reason, a method to calculate the second order network-loss reactive power sensitivity matrix is proposed, and on this basis a new method to choose the location for reactive power compensation in distribution network is given, in which the impacts of the compensation capacity of the compensation node selected in the latter on the sensitivity of the compensation node selected in the former are considered. The effectiveness of the proposed method is validated by simulation results of a 28-bus distribution network.