摘要
为提高永磁直驱风电机组所并电网的运行稳定性,研究电网故障下永磁直驱风电机组的运行特性以及提高其低电压穿越运行能力,文中提出一种适用于采用双脉宽调制变换器并网的永磁直驱风电机组的低电压穿越运行控制方案。通过在电网故障时限制发电机的电磁功率来限制输入至直流侧电容和电网侧变换器的功率,通过在电网故障时采用考虑发电机功率信息的网侧变换器电流闭环控制来实现直流链电压稳定控制,从而有效实现发电系统的低电压穿越运行。系统仿真结果表明,所提出的控制方案无需增加硬件保护装置,在电网对称及非对称故障下均可有效实现永磁直驱风电机组的低电压穿越运行。
To improve the stability of power grid with permanent magnet direct-driven wind turbines, the operational characteristics of permanent magnet direct-driven wind turbines under grid faults is studied. A low voltage ride-through （LVRT） control strategy is proposed for the direct-driven wind turbine using a back-to-back pulse-width modulation （PWM） converter. The electromagnetic power of the PMSG is limited under the grid faults to minimize the power transferred to the DC- link capacitor and grid-side converter. The generator power information is used in the current closed-loop control of the gridside converter to realize the stable control of the DC-link voltage. The simulation results show that hardware protection apparatus is not necessary and the proposed LVRT operation can be effectively realized under symmetrical and unsymmetrical faults.
出处
《电力系统自动化》
EI
CSCD
北大核心
2009年第12期91-96,共6页
Automation of Electric Power Systems
基金
国家高技术研究发展计划( 863计划)资助项目(2007AA05Z422)
重庆市科委科技计划项目攻关项目(CSTC2008AB3047)~~
关键词
风力发电
直驱
永磁同步发电机
电网故障
低电压穿越
wind-power generation
direct-driven
permanent magnet synchronous generator （PMSG）
grid faults
low voltageride-through （LVRT）
