摘要
电力用户和电力专家2类群体对电能质量的评价方式和优劣判断有明显不同。同时考虑用户需求和专家知识,提出了一种电能质量综合评估的新方法。首先利用语言评价和专家评分的形式分别描述用户、专家对监测点各指标的优劣评价;然后将这些评价信息作为证据,利用D-S(Dempster-Shafer,D-S)证据理论进行证据合成以确定各用户、专家对各监测点的评估信息。在个体的权重确定过程中,利用冲突度指数来计算个体的权重,同时计及不同群体的权重,并以此更新各个体的权重;最后,再次利用D-S证据理论确定各监测点电能质量的优劣及等级。仿真结果验证了所提方法的有效性。
There are obvious difference between the evaluation modes of power quality and the judgment of their advantage or disadvantage in the viewpoint of power consumers and experts. Considering consumer demand and expert knowledge, a new method to comprehensively evaluate power quality is proposed. Firstly, the evaluations on advantages or disadvantages of indices of all monitoring points are described by language evaluation and expert grading respectively; then taking evaluation information as the evidence, the evidence synthesis is performed by Dempster-Shafer theory to determine the evaluation information on each monitoring point from consumers and experts and to determine the weight of individual, the conflict degree is used to calculate the weight of individual by which the weight of each individual is updated, meanwhile the weights of different groups are taken into account; finally the Dempster-Shafer theory is used again to determine the power quality grades of all monitoring points. The proposed method not only can incarnate different requirements of consumers for power quality, but also can reflect experts’ knowledge, so it can incarnate the evaluation opinions of the majority. Simulation results verify the effectiveness of the proposed method.
出处
《电网技术》
EI
CSCD
北大核心
2011年第10期135-139,共5页
Power System Technology
关键词
电力市场
电能质量
专家知识
用户需求
证据理论
electricity market
power quality
expert knowledge
customer requirement
Dempster-Shafer theory
