To improve the ability of the high voltage ride through of the direct-driven Permanent Magnet Synchronous GeneratorWindTurbines, this paper proposes a high voltage ride through control strategy based on multi-modes control and the operational characteristics of the wind turbines. According to the extent of the grid voltage swells and the DC bus voltage, changing the control mode in the grid side converter via the mode selector contributes to the ability of the high voltage ride through of the wind turbines. PSCAD model simulation results show that this control strategy can not only ensure continuous work of the direct-driven Permanent Magnet Synchronous GeneratorWind Turbines during grid voltage swells, but also can effectively improve the reactive power compensation capabilities of wind turbines, which will promote the secure and stable operation of the grid.

为提高永磁直驱型风力发电机组的高电压穿越能力,在研究电网电压骤升下风力发电机组运行特性基础上提出一种基于双模控制的永磁直驱型风力发电机组高电压穿越控制策略.以电网电压骤升幅度及直流母线电压的升高程度为依据,利用选择器进行网侧变流器控制模式的转换,从而使直驱型风力发电机组具备高电压穿越能力.基于PSCAD仿真平台的仿真结果及应用结果表明,该控制策略不仅可以保证直驱型风力发电机组在电网电压骤升期间不脱网连续运行,还可以有效提高风力发电机组的无功补偿能力,有利于电网的安全稳定运行.

For the efficient and stable operation of the power system integrated with large scale of wind power,the response of the wind turbine generation system to the voltage swells of the power grid and technical principles of HVRT have gradually become a focus of studies at home and abroad. This paper introduces and interprets the high voltage ride-through(HVRT) concept by analyzing the large-scaled off-grid event, and presents different technical principles based on the current domestic and foreign HVRT standards and the transient process of the wind turbine under the voltage swell. The paper can provide useful reference for the research and application of the high voltage ride through technology for the wind turbine.

为保障风电大规模接入条件下电力系统的高效稳定运行,电网故障对风力发电机组的影响及相应故障穿越控制策略的研究逐步成为国内外研究热点.在研究直驱型永磁同步风力发电机组数学解析算法的基础上,运用PSCAD仿真平台建立了直驱型永磁风力发电机组仿真模型,并对直驱型风力发电机组在电网电压跌落和骤升工况下的暂态特性进行了仿真研究.