计及电压稳定性评估的配电网DG选址定容的研究

近些年配电网设备的运行越来越接近极限状态,使配网中也开始出现电压稳定问题。针对目前DG接入配网的研究大多未考虑电压稳定的因素,提出一种计及电压稳定性评估的配电网DG选址定容决策方法。通过对传统电压稳定指标进行改进,将电力系统允许的电压运行范围纳入稳定评估指标中。在综合考虑电压稳定性、系统网损和电流裕度指标的基础上,采用(Technique for Order Preference by Similarity to an Ideal Solution, TOPSIS)多目标决策方法对DG接入配电网的位置和容量进行决策。通过两节点系统算例与传统电压稳定指标的对比,验证了改进的电压稳定评估方法的合理性。通过IEEE33节点系统算例分析,验证了DG选址定容策略的可行性和有效性。

Research on locating and sizing of DG in the distribution network considering voltage stability assessment

In recent years, the equipment operation of the distribution network has been getting close to the limit state. Therefore, the problem of voltage stability has appeared in the distribution network gradually. In view of the factor that voltage stability is not considered in most current researchers on DG access to distribution network, a method for determining the location and capacity of DG in the distribution network is proposed, which takes voltage stability problem into account. By improving the traditional voltage stability index, the allowed voltage range of power system is included in the stability assessment index. Based on the comprehensive consideration of voltage stability, network power losses and current margin index, this paper uses TOPSIS method to decide the location and capacity of DG in the distribution network. Compared with the traditional voltage stability index, the rationality of the improved voltage stability evaluation method is verified through the simulation on two-node system example. And the feasibility and effectiveness of DG location and capacity determination strategy are verified through the analysis of IEEE33 node system. This work is supported by National Natural Science Foundation of China (No. 51277134).