基于可信性理论的含风电场电力系统电压稳定性评估

Voltage stability assessment of power system with wind farm based on credibility theory

针对风力随机性对电力系统静态电压稳定性影响问题,提出一种基于可信性理论的静态电压稳定概率评估与节点电压相对稳定性模糊评估相结合的综合评估方法。基于电压无功灵敏度分析方法选取雅克比矩阵的对角元素取值范围为静态电压稳定性的可信性评估指标,并利用可信性反演理论得到单次抽样的节点电压相对稳定性模糊评估矩阵。该方法克服了随机参数分布函数类型对静态电压稳定分析结果的影响,通过仿真计算结果的对比分析,证明该方法在计算量和计算精度方面具有优越性,同时也可实现实时评估。

To cope with the impact of random wind on static voltage stability of power system,a comprehensive assessment algorithm combined by the assessment for the probability of static voltage stability with the fuzzy assessment for relative stability of node voltage is put forward based on credibility theory. On the basis of reactive power sensitivity analysis,a credibility evaluation index can be derived from the range of diagonal elements of Jacobian matrix and according to credibility inversion theory,relative stability of node voltage from single sampling can be achieved. So the assessment algorithm above can overcome the influence of the analysis of static voltage stability form the random parameter distribution function; by comparing simulation results,it performs better in computation amount and accuracy and also can realize real time assessment.