交直流混合系统数字仿真的研究

本文应用网络分裂法在时城内求解整个交直流混合系统(AC/DC系统),提出了交直流网络及直流换流器的数学模型,建立了新的有效的各部分数模之间的接口方法,并在UBC版EMTP电磁暂态程序基础上,开发出一个多功能的AC/DC系统通用数字仿真程序。综合GS工程,对系统稳态运行及某些交流对称、不对称故障进行了仿真计算和分析。结果表明,本文采用的数学模型及由此开发的AC/DC系统数字仿真程序是正确有效的。

A STUDY ON DIGITAL SIMULATION OF AC/DC POWER SYSTEMS

This paper presents a new method for the dynamic digital simulation of AC/DC power systems, based on Kron's Diakoptics in time domain. The detail mathmatical model of an AC/DC power system, which is divided into four subsystems: AC ststem, DC network, converter and its control system, and the exact interfaces between the subsystems are presented in the paper. A versatile digital simulation program based on UBC's EMTP for AC/DC power system transient studies has been developed. Finally, some of the computed results of an AC/DC power system under steady-state, AC balanced and unbalanced faults are given in the paper. The analysis of the results shows that both the model and the program are correct and accurate.