静态安全约束下基于分解最优潮流的最大输电能力计算方法

在正常情况下，最大输电能力(total transfer capability，TTC)主要取决于电压相位的变化；而损耗减小主要取决于无功的分布，损耗最小与输电能力最大化相一致。基于此，将TTC计算分成2个子问题：①增量TTC预测，可简化为无损的线性等值电路进行计算；②随着TTC的不断变化，建立一定运行模式下损耗最小的非线性优化模型，以校正无功分布对TTC的影响。由此形成2个子问题交替计算的算法，通过合理的步长控制，最终实现与完整优化(optimal power flow，OPF)一样的效果。算例分析结果表明，该模型及算法是有效的。

Optimal Power Flow Decomposition Based Total Transfer Capability Calculation under Static Security Constraints

Under normal conditions, total transfer capability (TTC) depends on the change of voltage phase, and yet the power loss depends on the distribution of reactive power and the minimization of power loss is in conformity with the maximization of TTC. On the basis of this idea, the calculation of TTC can be divided into two sub-problems, namely (A) the prediction of incremental TTC, which can be calculated by means of simplified linear non-loss equivalent circuit and (B) along with unceasing variation of TTC, a nonlinear optimal model with minimized power loss under certain operating mode is to be built to correct the influence of reactive power distribution on TTC. Here from an algorithm by which the two sub-problems are alternatively calculated is formed; through rational step size control an effect which is as same as that by complete optimization, i.e., the optimal power flow, is finally realized. Analysis results from several IEEE test systems and Shandong power grid show that the proposed model and algorithm are available.