针对远距离交直流互联多区域电力系统分层分区调度的特点，在已知各区域电网间总电力交换计划的前提下，提出一种远距离交直流并联输电通道联络线有功功率优
化分配方法，优化模型以交直流联络线的总有功损耗最小为目标，考虑交流联络线输电断面的安全约束，并考虑直流联络线功率调节范围和调节次数限制的约束，优化得到交直流联络线的输送功率计划． 针对直流潮流模型计算长度达数百公里的省间交流联络线功率误差偏大的问题，提出了一种简化交流潮流模型以提高计算精度． 通过改进三阶段法求解优化模型，使直流联络线计划既满足功率调节次数限制，又满足每一个输电功率状态的最小持续时间限制，同时实现优化模型各个时段的解耦求解和各个时段子优化模型的并行计算． 最后以某一实际大型交直流互联多区域系统为例，验证了所提模型和求解方法的正确性、有效性．

According to the hierarchical and zoned dispatching characteristics of multi-area interconnected AC/DC power systems,an optimal distribution method of active power for tie-lines in long-distance AC/DC parallel trans- mission channel is proposed on the basis of a given total power exchange schedule among regions.In the optimiza- tion model,the minimum active power loss of AC/DC tie-lines is used as the objective function,and,security con- straints of the inter-province AC tie-line sections,as well as the constraints of power regulation range and regulation frequency limit of DC tie-lines,are taken into consideration,Then,a power transmission schedule of AC/DC chan- nels is obtained.Instead of DC power flow model,a practical model called simplified AC power flow model is pro- posed,which is used to calculate the transmission power of inter-province AC tie-lines with hundreds of kilometers in length more accurately.Moreover,for the purpose of satisfying the constraints of DC tie-line power regulation frequency limit and the minimum duration limit of each power state of DC tie-lines,an improved three-stage method is applied to the optimization model.Thus,the optimization model can be decoupled in each dispatch period,and each sub-model can be parallelly computed in each dispatch period.Finally,by taking a practical large-scale AC/ DC interconnected multi-area power system for example,the correctness and effectiveness of the proposed optimiza- tion model and the corresponding solving algorithm are both verified.