计及源荷双侧响应的概率潮流计算方法

摘要

In order to effectively consider the impact of source-side and load-side responses on the power flow distribution,according to the random injection probability model and the response probability model,the probabilistic power flow model based on the cumulant method is improved in two aspects:the allocation of unbalanced power reference between schedulable conventional unit and flexible load,the calculation of random response.Since the traditional model applies a single balance machine to bear the unbalanced power of whole system,the power flow calculated by it has larger error.The improved model avoids this defect to better reflect the actual power flow distribution.An algorithm is presented to solve the model.Simulation and analysis for an actual power grid verify the validity and practicability of the improved algorithm.%为有效计及源荷双侧响应对潮流分布的影响,基于系统随机注入量与响应量的概率模型,从可调度常规机组和柔性负荷的不平衡功率基准值的分配、响应随机变量的计算2个方面对基于半不变量法的概率潮流模型进行了改进,并提出了其求解流程.该算法避免了传统概率潮流模型由单平衡机承担系统不平衡功率而导致的潮流结果误差较大的弊端,计算结果更加符合实际潮流分布的情况.对某实际电网的算例仿真分析验证了算法的有效性和实用性.