一种电网等值分解及短路计算新方法

近年来我国电网规模及复杂性不断增加,现有继电保护离线整定方法已越来越难满足保护性能的要求。随着广域信息测量及电网通信技术的快速发展,继电保护在线整定无疑是解决上述问题的有效措施,而对大型电力系统网络结构及运行方式进行快速短路计算是在线整定技术发展的一项重要前提。首先提出了一种电力系统扰动域划分方法,在此基础上将复杂大电网等值分解为若干小型子网以简化短路及整定计算求解过程,并进一步基于LDU分解法设计了一种采取并行运算的快速短路计算新方法。基于OPENMP并行计算平台的程序计算结果证明了新方法与传统单核串行计算相比运算速度显著提升,为在线整定技术的发展提供了新的思路及解决方案。

A new method of power grid equivalent decomposition and short-circuit calculation

In recent years, the scale and complexity of Chinese power grids have increased continuously, making it increasingly difficult for existing offline setting methods to meet the requirements of relay protection. With the rapid development of wide-area information measurement and power grid communication technologies, relay protection online setting undoubtedly is an effective measure to solve the above problems. However, the fast short-circuit calculation of the large-scale power system network structure and operation mode is an important prerequisite for online setting technology development. For this reason, this paper proposes a power system disturbance area division method. Based on this, the large-scale power grid is decomposed into several small sub-networks to simplify the short-circuit calculation process. Furthermore, a new parallel computing method of fast short-circuit calculation based on LDU decomposition method is proposed. The calculation results of the program based on the OPENMP parallel computing platform proved that the computing speed of the new method is significantly improved compared with the traditional single-core serial computing. The new method provides a new idea and solution for the development of online setting technology. This work is supported by National Natural Science Foundation of China (No. 51677108) and Science and Technology Project of State Grid Corporation of China (No. SGTYHT/16-JS-198).