基于Matlab的高压直流输电系统仿真研究

摘要

本文介绍了高压直流输电（HVDC）系统的构成和原理，讨论MATLAB/Simulink环境下电力系统元件模型建立原理和电网网络方程求解方法，依据高压直流输电的控制规律，建立好其仿真模型，并在模型的基础上，把控制规律及其故障由换流器进行仿真，验证所建立仿真模型的准确性。结果表明，该方法能较有效的观测暂态过程中高压直流输电系统的动态性能。研究HVDC的结构、运行原理及控制方法，对HVDC进行建模与仿真，分析系统的稳态、动态特性等显得非常重要。本文介绍了高压直流输电的历史背景及在国内外的发展状况，分析了高压直流输电的控制基本理论，利用Matlab中的Simulink对HVDC进行建模，并在此模型基础上进行了系统的稳态、直流线路故障、逆变器交流侧单相接地故障及两相接地故障仿真，得出相应的仿真波形，验证了HVDC模型的有效性和正确性。

关键词　高压直流输电系统；Matlab/Simulink；仿真模型；仿真分析

Abstract

This paper introduces the structure and principle of HVDC (HVDC) system, discusses the establishment principle of power system element model in MATLAB/Simulink environment and the solution method of power network equation, and according to the control law of HVDC transmission, The simulation model is established and the control law and its faults are simulated by converter on the basis of the model to verify the accuracy of the simulation model. The results show that the proposed method can effectively observe the dynamic performance of HVDC system in transient process. The structure, operation principle and control method of HVDC are studied, and HVDC is modeled and imitated. Really, it is very important to analyze the steady-state and dynamic characteristics of the system. This paper introduces the historical background of HVDC transmission and its development at home and abroad, analyzes the basic theory of HVDC control, uses Simulink in Matlab to model HVDC, and makes the steady state of the system on the basis of this model. The simulation of DC line fault, single-phase grounding fault and two-phase grounding fault on the AC side of inverter is carried out, and the corresponding simulation waveforms are obtained. The validity and correctness of the HVDC model are verified.

Keywords HVDC transmission system; Matlab/Simulink; simulation model; simulation analysis