输电断面潮流的N-1静态安全约束

N-1 principle steady state security restriction on power flow of transmission tie line group

就电网运行中广泛采用的N-1原则,建立了输电断面潮流静态安全约束的非线性优化数学模型并给出了迭代求解算法。针对复杂大规模互联电网建立了基于直流潮流的简化模型。考虑了运行方式变化对断面潮流传送能力的影响.提出将运行方式划分为发电模式和负荷模式分别进行分析。运用典型模式方法分析负荷变化对潮流约束的影响,解决了负荷变化规律难以模拟的问题,而发电模式的变化应依据实际系统电源的最大、最小方式确定。算例表明.所提出的方法简捷可靠,能够满足实际电网运行需要。

Based on the N-1 principle of power system, a nonlinear optimized model of steady state security restriction on the power flow of transmission tie line group is proposed, and its iterative algorithm is detailed. A simplified model based on DC power flow is established to analyze large transmission network. The influence of operation mode on the transmission capacity of transmission tie line group is analyzed,which is divided into generation mode and load mode. The typical mode method is used to study the influence of load change on flow restriction, which reduces the difficulty in load change simulation. The generation mode variation is decided according to the maximum and minimum operation modes of power grid. Examples on test system show that the proposed method is simple, reliable and competent for the practical operation of power network.