含微网配电网规划中的电能质量综合评估

针对含微网的配电网规划阶段的特殊条件,提出了基于层次分析法的电能质量综合评估方法.首先通过分析判断矩阵与比较矩阵对应元素之间的联系,改进判断矩阵的一致性,得到具有合理一致性比例的指标权重.在此基础上,运用层次分析法结合微网中含有的不同类型的分布式电源及其容量,以及各个微网接入点的短路容量等条件,将电压偏差、电压波动和闪变、谐波畸变率,三相不平衡度、频率偏差等指标综合量化,得到电能质量的综合性评价指标.最后通过案例实现该综合评估方法的应用.

Comprehensive Power Quality Assessment on Distribution Network Planning Containing Micro-Grid

According to special conditions in the planning stage of distribution network containing microgrids,a comprehensive power quality assessment method based on improved analytical hierarchy process(AHP) was proposed.Firstly,by means of analyzing the relationship between the corresponding elements in judgment matrix and comparison matrix the consistency of judgment matrix was improved to obtain index weights with reasonable consistency ratio.On this basis,utilizing improved AHP and combining with such conditions as different types of distribution generations contained in the microgrids and their capacities as well as short-circuit capacities at the points where microgrids were connected to distribution network,the indices such as voltage deviation,voltage fluctuation and flicker,unbalancedness degree among three-phase voltages and frequency deviation were comprehensively optimized to attain comprehensive power quality assessment index.Case study results showed that the proposed method could assess power quality objectively and reasonably.