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兆瓦级直驱永磁风电系统低电压穿越研究
  • 期刊名称:中国电力(CSCD)
  • 时间:0
  • 分类:TM614[电气工程—电力系统及自动化]
  • 作者机构:[1]兰州理工大学电信学院,甘肃兰州730050, [2]甘肃电力科学研究院,甘肃兰州730050
  • 相关基金:国家自然科学基金资助项目(50877034)
  • 相关项目:基于横向磁通永磁发电机的直驱式变速恒频风力发电系统研究
中文摘要:

通过对兆瓦级商驱式永磁同步风力发电机(PMSG)系统低电压穿越能力的研究,提出一种改进的直流母线电压控制策略、该策略通过调节直流电流和控制发电机的输出功率,抑制直流母线动态过电压。与传统控制策略相比.该策略中升压斩波变换器采用电流内环、直流母线电压外环的双闭环控制结构;网侧逆变器采用电流内环和转速外环的双闭环控制结构。仿真结果表明,该控制策略可有效提高PMSG系统的低电压穿越能力.

英文摘要:

By studying the low voltage ride through (LVRT) capability of a MW-level variable speed wind turbine unit with a direct-driven permanent magnet synchronous generator (PMSG), an improved DC link voltage control strategy was proposed. This strategy can suppress dynamic over-vohage at DC buses by adjusting DC current and controlling the generator output. Compared with the traditional control strategy, the improved one uses the double closed-loop control structure with the current inner loop and the DC link voltage outer loop in the boost chopper converter. And its inverter has also the double closed-loop structure with the current inner loop and the rotating speed outer loop. The simulation results show that the improved control strategy can effectively improve the LVRT capability of a variable speed wind turbine unit with a PMSG.

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