Research on Wind Power Generation Low Voltage Ride-through Protection Circuit Based on Energy Storage Component

Xiao Wenjuan, Mai Xiaoqin
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引用次数: 1

Abstract

The low voltage ride through capability of wind turbines is an important indicator to measure the ability of wind power systems to be connected to the grid. With traditional control strategy, the low voltage ride-through capability with direct drive permanent magnet synchronous wind power generation system has limited. This paper improves the LVRT capability of DPMG by adding a chopper protection circuit with energy storage device to the DC side of wind power system. In this paper, the control method of Chopper protection circuit with energy storage device, the selection of energy storage components and the control principle of bidirectional converter are analyzed. The improved circuit is simulated by MATLAB/simulink. The result proves that when the grid voltage drops, the existence of the chopper protection circuit with energy storage components can maintain the input and output power balance of the system in a short time, stabilize the DC side voltage, and improve the low voltage ride through capability of the wind turbine.
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基于储能元件的风力发电低压穿越保护电路研究
风电机组的低压穿越能力是衡量风电系统并网能力的重要指标。采用传统的控制策略,直接驱动永磁同步风力发电系统的低压穿越能力受到限制。本文通过在风电系统直流侧增加带储能装置的斩波保护电路,提高了DPMG的LVRT能力。本文分析了带储能装置的斩波保护电路的控制方法、储能元件的选择以及双向变换器的控制原理。利用MATLAB/simulink对改进后的电路进行了仿真。结果表明,当电网电压下降时,带储能元件的斩波保护电路的存在可以在短时间内维持系统的输入输出功率平衡,稳定直流侧电压,提高风电机组的低压穿越能力。
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