考虑安全约束的输电断面经济传输容量及其计算

利用网络拓扑结构和潮流分布状态，来实时地确定与过载支路相关的关键输电断面．根据输电断面潮流的大小、方向及其传统控制判据，提出了衡量输电断面潮流控制合理性的新判据：根据输电断面的经济传输容量来实时控制有功潮流的大小和电力交易．潮流控制原则是：在经济当量的基础上，应用线性规划法，结合蒙特卡罗模拟法，建立了输电断面可用经济传输能力计算的概率模型，得到经济传输容量的数学期望值及其概率分布．通过分析数学期望值和概率分布，可以得到反映电网网架结构薄弱点的瓶颈设备．采用改进的IEEE RTS-79的32机24节点系统，计算了不同约束下的输电断面经济传输容量，结果表明，在保证经济性最优的前提下，输电断面潮流控制原则能使该输电断面的传输容量下降10％．

Transmission Section Economic Available Transfer Capability with Security Constraints

The key transmission section interrelated to overload branch is obtained according to real-time information of networks topology and load flow.Considering the active power flow across the key transmission section and the rationality of cross-sectional power flow control,transmission section economic transmission capacity is put forward.Based on economic equivalent,a corresponding algorithm combining with Monte Carlo simulation and linear programming is proposed to evaluate the transmission section economic available transfer capability(TSEATC),where the uncertainties in power system are taken into account.By analyzing the expected value and the probabilistic distribution of available transfer capability(ATC),the bottleneck information is also obtained to indicate the system weakness.Finally,the rationality of the model and the feasibility of the developed algorithm are verified with the modified IEEE 32-machine 24-node power system as an illustrative one.