基于改进连续潮流的输电断面热稳定功率极限计算

输电断面的热稳定功率极限关系到电力系统安全稳定运行,是限制电网功率传输的重要因素。为准确、快速评估电网的热稳定运行状态,提出一种改进连续潮流的输电断面热稳定传输功率极限计算方法。在考虑系统线路热稳定约束、发电机最大有功功率约束和部分支路开断后的线路功率约束下,利用线性最优化方法调整各发电机出力;在此基础上,进一步用连续潮流法得到断面热稳定功率极限。最后通过新英格兰39节点系统的不同场景,仿真验证了所提方法的正确性及有效性。

Approach of Thermal Stability Power Limit for Transmission Sections Calculation Based on Improved Continuous Power Flow Method

The thermal stability power limit of transmission sections bears on the safe and stable operation of power system, which has an important effect on power transmission of power grid. To accurately and quickly distinguish the thermal stability status of power grid, a new method of calculating the thermal stability power limit of the transmission section with improved continuous power flow is proposed. The proposed method considers constraints of lines and maximum output of generators, then, adjusting the output of each generator through linear optimization. On this foundation, using continuous flow method to obtain the thermal stability power limit of the transmission section. Finally, the correctness and validity of the proposed method are verified through New England 39-bus system by simulation for different scenarios.