为提高电力系统运行安全水平，提出一种基于N-1原则的输电断面热稳定功率极限评估方法。计算功率灵敏度矩阵得到各发电机节点对线路功率的控制情况，依次以断面各线路为目标线路，通过调整发电机出力，在满足全网线路冗余量约束、开断线路功率增加约束以及发电机可调量约束的基础上，利用最优化方法得到各目标线路对应的断面最大传输功率，取其中最小值为断面热稳定功率极限。在IEEE39节点系统中对该方法的正确性进行了验证。%To improve the operation safety level of power system,an evaluation method on thermal stability power limit of transmission section based on N-1 principle is put forward. The control parameters of generator nodes on line power are obtained by computing the power sensitivity matrix. By taking the lines on the transmission section as target lines suc⁃cessively,and on the basis of satisfying constraints such as line redundancy,power increase due to broken line,and ad⁃justable generator capacity,the generator output is adjusted,and the maximum transmission section powers correspond⁃ing to the target lines are obtained using optimization method,of which the minimum value is taken as the thermal stabili⁃ty power limit of the transmission section. The correctness of the proposed method is verified in IEEE 39-node system.
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