投影梯度法模糊层次综合评价模型在饱和负荷分析中的应用

The application of fuzzy hierarchy comprehensive evaluation model based on projection gradient method in analysis for electric load saturation

提出了基于投影梯度法的模糊层次综合评价模型,对城市饱和负荷水平进行客观评价。根据评价指标体系,创建了判断矩阵和一致性指标函数。利用投影梯度法计算一致性指标函数最小值,检验、修正判断矩阵的一致性。通过调整判断矩阵的各评价因素标度改进了一致性指标值,优化了各评价因素的权重。计算结果表明:此算法是一类"主动"方法,计算权值误差小,计算稳定性强,克服了权重计算时主观性较强的缺陷,提高了评价结果的合理性。同时,以某市电网为研究对象,从社会因素、自然因素、经济因素3个方面,评价了该市负荷饱和水平,评价结果合理有效,具有良好的参考作用。

The fuzzy hierarchy comprehensive evaluation mod- el based on projection gradient method was created to objectively an- alyze the level of electric load saturation. Based on evaluation index system, judgment matrix and consistency index function were creat- ed. The projection gradient method was used to calculate the mini- mum value of consistency index function which aimed at testing and modifying the consistency of the judgment matrix. The consistency in- dex value and the weight of each influencing factors were optimized by adjusting scales of evaluation factors in judgment matrix. The re- sult shows that this method is an active method with strong stability and minor error in calculating weight. The method also overcomes ob- jective weakness in calculating weight and improves the rationality of the evaluation result. Meanwhile, a city was takers as the researching object and this city＇ s load saturation level was evaluated from social factors, natural factors and economic factors. The result is reasonable and effective with a good reference.