基于VSC-HVDC技术的风电场并网控制策略研究

摘要

轻型直流输电（VSC-HVDC）采用电压源换流器技术，具有较强的可控性，是目前比较理想的一种风电场并网方式。本文研究了VSC-HVDC在风电场并网中的控制策略。风电场侧的换流站通过控制风电场的频率，可以让鼠笼异步风力发电机组变速运行，从而提高此类风力发电机组在低风速下的风能利用率；对于双馈风力发电机组组成的风电场，换流站控制风电场的频率为额定值，同样取得了很好的控制效果。%VSC-HVDC, with voltage source converter technology, has strong controllability and is an ideal solution for wind farm grid connecting. This paper studies the control strategy of VSC-HVDC in wind farm grid connecting. By controlling the frequency of wind farm at wind farm side converter station, squirrel cage induction generator can be operated at variable speed, and therefore the utilization of wind energy is improved at low wind speeds. For double fed induction generator (DFIG) wind farm, the convertor station controls the frequency at rated value that has obtained also a very good effect.