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The research of zero voltage ride through strategy of DFIG

机译:DFIG零电压穿越策略的研究

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With the increase of wind power capacity in the grid, the running characteristics of wind turbines in the grid should not be ignored, especially the fault ride through ability of the wind turbines make a great influence to the safety of power grid. In this paper, the double fed wind generator (DFIG) with the Crowbar protection strategy is the main research object, a detailed studied is given on the change of transient characteristics and adaptability of the existing protection strategy when the terminal voltage of wind turbines dropped to 0pu. On this basis, the comprehensive control strategy of zero voltage ride through (ZVRT) of DFIG is put forward — a comprehensive control strategy with rapid pitch angle control, multiple levels of protection circuit response and the improved excitation control strategy. Through simulation comparison, it confirmed that the new comprehensive ZVRT control strategy could effectively suppress the fault current in the rotor and stator of DFIG, reduce the oscillation of torque and inhibit the rotate speed rise of rotor in the ZVRT, it is very help to enhance fault ride through ability of DFIG.
机译:随着电网中风电容量的增加,电网中风机的运行特性不容忽视,尤其是风机的故障穿越能力对电网安全影响很大。本文以具有撬杠保护策略的双馈风力发电机为主要研究对象,详细研究了当风力发电机的端电压降到零时,瞬态特性的变化和现有保护策略的适应性。 0pu。在此基础上,提出了DFIG零电压穿越(ZVRT)的综合控制策略—具有快速俯仰角控制,多级保护电路响应和改进的励磁控制策略的综合控制策略。通过仿真比较,表明新的综合ZVRT控制策略可以有效地抑制DFIG转子和定子中的故障电流,减少转矩的振荡,抑制ZVRT中转子的转速上升,对提高ZVRT的效率有很大帮助DFIG的故障穿越能力。

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