风力发电系统低电压穿越技术研究

Research on the LVRT Technology of Wind Power System

文中详细介绍了目前国内外风力发电的发展概况和风电系统低电压穿越能力的现状。对目前主流的两种变速恒频风电系统双馈式和直驱式系统分别进行了低电压穿越特性研究,给出了相应的控制策略。其中双馈式采用主动式Crowbar电路保护控制,直驱式采用STATCOM模式控制。最后应用PASCAD进行了建模仿真验证,结果表明该方法可以实现风电系统在电压跌落情况下的安全稳定运行。

The current situation of wind power generation at home and abroad and the development status of the LVRT technology of the wind power system are introduced in detail.Two main trend of double-fed and direct-drive VSCF wind power system is studied through the LVRT characteristics and the corresponding control strategy is put forward.Crowbar circuit protection control is adopted in double-fed mode,while STATCOM mode control is utilized in direct-drive mode.Finally,the PASCAD modeling and simulation results show that this method can achieve the safe and stable operation of the wind power system under the condition of voltage drop.