考虑容量及电压约束的高压配电网可靠性快速评估算法

鉴于目前高压配电网可靠性评估研究较少,文中提出一种考虑容量及电压约束的可靠性评估快速混合算法。基于高压配电网分区供电特点,将大规模电网转换为多个小规模电网;提出将线路允许电压损耗转化为相应的容量约束,之后的算法不再考虑电压约束;提出基于虚拟初始闭环潮流的元件冗余容量进行容量约束保守校验,快速筛选出部分不受容量约束的故障状态。该算法将网流法引入高压配电网可靠性评估,利用最大流模型进行容量约束详细校验,并采用消圈法进行最小切负荷快速计算。算例结果表明,在满足工程计算精度情况下,高压配电网分区策略加上保守和详细容量校验可减少计算量,具有实用价值。

Efficient Reliability Evaluation Algorithms for High Voltage Distribution Network Considering Capacity and Voltage Constraints

As few studies on reliability evaluation of high voltage distribution networks are available, a new hybrid algorithm is proposed to consider capacity and voltage constraints for the reliability evaluation of a high voltage distribution network. Based on the weakly-meshed feature of a high voltage distribution network, a large-scale grid is partitioned into multiple small-scale grids. A voltage constraint is transformed into its corresponding capacity constraint so that the subsequent voltage constraint is no longer considered. It is proposed that a capacity constraint be conservatively checked based on the elements capacity redundancy with all tie-connections being closed. Thus partial fault states that are not restrained by capacity are rapidly screened out. The network flow method is employed for the reliability evaluation of high voltage distribution networks and detailed capacity constraint checking is conducted using the maximum flow capacity model. Finally, the cycle-canceling algorithm is employed to efficiently obtain the minimum load-cutting. The numerical results show that the execution time is significantly shortened by the high voltage distribution network partition in addition to conservative and detailed capacity constraint checking when the requirement of engineering calculation accuracy is satisfied.