提高含新能源交流电网短路计算迭代收敛性的改进方法  

Improved method for improving iterative convergence of short circuit calculation in new energy AC power grid

作　　者：郑心怡 朱佳 李银红[1] ZHENG Xinyi;ZHU Jia;LI Yinhong(State Key Laboratory of Advanced Electromagnetic Engineering and Technology,Huazhong University of Science and Technology,Wuhan 430074,China;Electric Power Dispatching and Control Center of Guangdong Power Grid Co.,Ltd.,Guangzhou 510220,China)

机构地区：[1]华中科技大学强电磁工程与新技术国家重点实验室,湖北武汉430074 [2]广东电网电力调度控制中心,广东广州510220

出　　处：《电力自动化设备》2024年第8期201-209,共9页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(52207107);中国南方电网有限责任公司科技项目(036000KK52210063(GDKJXM20210094))。

摘　　要：交流电网短路故障下,新能源电源的输出电流与并网点电压非线性相关,使得含新能源交流电网短路电流计算需要利用迭代方法求解,存在无法收敛的可能。针对该问题,选取适用于交流电网短路计算的新能源等效模型,以包含新能源典型输出特性的双馈风机作为研究对象,确定了高电压单段型、低电压单段型和高电压双段型这3种不收敛工况。根据3种不收敛工况的特征,提出了基于二分法和基于二分法与逐步回归结合的改进方法,提高了上述工况下迭代计算的收敛性。以实际电网为例,通过仿真计算验证了所提方法的有效性。The output current and the grid voltage of the new energy source are nonlinearly coupled under the short circuit fault of AC power grid,which makes the calculation of short circuit current of AC power grid need to be solved by iterative method,which may not converge.To address this problem,the new energy equivalent model suitable for AC power grid short circuit calculation is selected,the doubly-fed wind turbine includes typical new energy output characteristics are taken as the research object,and three nonconverging working conditions,namely high voltage single-segment type,low voltage single-segment type and high voltage double-segment type are determined.Then,according to the characteristics of three non-converging working conditions,the improved methods based on the dichotomous method and the combination of the dichotomous method and stepwise regression are proposed to improve the convergence of the iterative calculation under three non-converging working conditions.The effectiveness of the proposed method is verified by simulation calculation using the actual power grid as an example.

关 键 词：新能源 短路计算 迭代方法 收敛性 二分法 

分 类 号：TM713[电气工程—电力系统及自动化]