基于非对称贴近度的电网短路电流限制方案决策方法

Decision Method of Short-circuit Current Limiting Scheme of Power Networks Based on Asymmetric Closeness

为了有效治理电网短路电流超标问题,设计了基于非对称贴近度混合决策模型的电网短路电流限制方案决策评估与优选方法。考虑电网短路电流限制措施的相关影响,从短路电流、静态安全、暂态稳定、实施费用4个方面建立了电网短路电流限制方案优化决策指标体系,精简分析了8个三级评价指标因素,并进行了决策评估结果划分。提出了均衡指标间相互影响关系的改进DEMATEL+ANP指标权重赋值方法,进一步计及非对称贴近度、优先度和证据云理论建立了电网短路电流限制方案优化决策评估混合决策模型。结合基于PSASP的仿真实例对所提出的优化决策评估方法的有效性进行了验证。该方法可更好均衡评价指标,充分考虑了优化决策评估中的模糊性与随机性,不仅能够实现多种方案选优的评估,更能实现自身方案评估,提高了电网短路电流限制方案优化决策评估的准确性及适用性。

In order to effectively manage the grid short-circuit current overrun problem,optimization decision-making evaluation method of short-circuit current limitation scheme based on hybrid decision model considering asymmetric closeness was designed.Considering the relevant influence of the short-circuit current limiting measures of the power grid,a four-level evaluation index system considering short-circuit current,static safety,transient stability and implementation cost was established,eight three-level evaluation index factors were simplified and analyzed,and the decision evaluation results were divided further.An improved DEMATEL+ANP index weight assignment method for balancing the interaction relationship between indexes was proposed,and a hybrid decision-making model for the optimization decision evaluation of the short-circuit current limitation scheme of power grid was established by further considering asymmetric closeness,priority and cloud theory.Combined with simulation example based on PSASP,the effectiveness of the proposed optimization decision evaluation method was verified.This method can better balance the evaluation indexes,fully consider the fuzziness and randomness in the optimization decision evaluation,not only can realize the evaluation of multiple schemes,but also can realize the evaluation of its own scheme,and improve the accuracy and applicability of the optimization decision evaluation of the short-circuit current limit scheme of the power grid.