柔性直流输电技术及其应用研究

Research and Application of VSC-HVDC Engineering Technology

柔性直流输电技术作为一种新型直流输电技术得到了广泛的应用。目前,欧美对于柔性直流输电技术的研究已经成熟,而我国近几年来才开始建设一些示范工程。为给柔性直流输电技术在我国的普及和发展提供参考,首先阐述了柔性直流输电技术的系统结构和运行机理,分析了基于可关断电力电子器件的电压源换流器主电路拓扑结构与PWM调制方式,指出了该技术的优势与不足;总结了目前国内外柔性直流输电技术的主要应用领域以及工程实例。柔性直流输电技术具有高效、控制方式灵活、对电网干扰小等特点,对促进我国未来电网的发展具有重要作用。

A new type DC transmission technology which is called VSC-HVDC has been widely used. At present, the research of VSC-HVDC on Europe and the United States has been mature,and our country has begun to build some demonstration projects in recent years. To improve the popularization and devel- opment of VSC-HVDC in our country, firstly expounds the operation mechanism of VSC-HVDC, analyzes the main circuit topology structure of voltage source converter which is based on the electric power elec- tronics that can shut off and PWM. Points out the advantages and disadvantages of the technology; Sum- marizes the main application field of VSC-HVDC and engineering examplesat home and abroad. The flexi- ble HVDC with its technical characteristics which isefficient, flexible control, low interference to power grids has an extremely important role to promote the development of our country＇s future power grid.