中国电机工程学报2016，Vol.36Issue(14)：3789-3797,9.DOI:10.13334/j.0258-8013.pcsee.151853
大型海上全直流风场中基于MMC的风力发电变流器及其控制
MMC Based Wind Power Converters for Offshore DC Wind Farms
摘要
Abstract
With the increasing scale of offshore wind farms, DC wind farms become the future development trend of offshore wind power. MMCs have been widely used for high-power high-voltage AC/DC applications, and they are able to convert power directly from a low voltage AC source to a high DC voltage source, which makes them a promising solution for wind power converters in offshore DC wind farms. The operation of MMC DC wind power converters was analyzed. It is found the voltage ripple of submodule capacitors will distort the output AC voltage in low- modulation-ratio operating conditions. By analyzing the mechanism of voltage distortion, a modified control scheme was proposed to enhance the dynamic performance which is affected by the distorted AC voltage. The detailed digital simulation on RT-LAB platform confirms the theoretical analysis and the control scheme on a 10MW test system, which connects a 6kV permanent magnetic synchronous generator to a 50kV DC grid. To further test the proposed system, an experiment was carried out on a 30 kW MMC platform.关键词
海上直流风场/模块化多电平变换器/风力发电变流器/低调制比/电压畸变Key words
offshore DC wind farm/modular multilevel converter (MMC)/wind power converter/low modulation ratio/voltage distortion分类
信息技术与安全科学引用本文复制引用
常怡然,蔡旭..大型海上全直流风场中基于MMC的风力发电变流器及其控制[J].中国电机工程学报,2016,36(14):3789-3797,9.基金项目
国家自然科学基金项目(51261130484)；上海市科委基金资助项目(13dz1200202)。 Project Supported by National Natural Science Foundation of China (51261130484) （51261130484）
Shanghai Science and Technology Committee Fund (13dz1200202) （13dz1200202）
