摘要
对使用全功率变流器的永磁直驱风电系统的低电压穿越保护方案进行了研究,分析了定子侧、直流侧、电网侧不同的Crowbar保护方案以及静止无功补偿、浆距角、叶尖速比三种控制策略,介绍了工作原理及各自的优缺点。对比结果表明,采用Crowbar保护电路具有更好的市场竞争力和应用前景;故障时网侧变流器运行在静止无功补偿模式是直驱电机固有的优势,具有优良的无功补偿性能,而浆距角及叶尖速比的调节也对机组的穿越功能有一定的辅助作用。
This paper studied low-voltage ride-through protection plan of permanent magnetic direct-drive wind power system using full-power converter, analyzing different Crowbar protection plans at stator side, at direct current side and at power network side, and three kinds control strategies of static vat compensation, propeller pitch angle and blade tip speed ratio. Introduction was made to the working principles and advantages and disadvantages of each plan and strategy. Comparison result shows that adopting Crowbar protec- tion circuit is with better market competitiveness and application prospect; converter operating in static var compensation mode at pow- er network side is the inherent advantage of direct-drive motor at fault time with fine var compensation performance, and the regulation of propeller pitch angle and blade tip speed ratio is also with certain accessorial function for ride-through function of wind generator set.
出处
《电工电气》
2012年第6期1-4,共4页
Electrotechnics Electric
