Wind power converter high voltage ride-through control method and device

Abstract

The invention provides a wind power converter high voltage ride-through control method and device. The control method comprises steps: a positive-sequence voltage D-axis component / phase voltage effective value of the power grid side of the converter is acquired; if the positive-sequence voltage D-axis component / phase voltage effective value is larger than a preset ride-through starting voltage value, the converter is determined to enter a high voltage ride-through mode; and according to a preset over modulation control strategy, a floating DC bus voltage control strategy and / or a reactive priority control strategy, the converter is controlled to ensure the converter to operate stably. According to the wind power converter high voltage ride-through control method and the control device provided in the invention, the wind power converter can operate stably in a high voltage operation range, the stability of the power grid is improved, large-scale wind power grid disconnection caused by voltage disturbance or failure is prevented, the working stability of each component in a wind turbine can be improved at the same time, and the practicability of the control method is improved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of wind power generation, and in particular to a control method and device for high voltage ride-through of a wind power converter. Background technique [0002] For wind turbines, the voltage working condition of the power grid where the wind turbines are located directly affects the working status of the wind turbines. Entering the high-voltage working area, at this time, the grid-side inverter of the converter can be operated at a certain high voltage by increasing the DC bus voltage. [0003] However, in the process of implementing this technical solution, it is found that the existing technology has the following defects: when the voltage continues to rise, the method of increasing the DC bus voltage will not be applicable, which will cause the wind turbines to fall out in a relatively high voltage range. The risk of the power grid brings greater risks to the normal operation of t...

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Problems solved by technology

[0003] However, in the process of implementing this technical solution, it is found that the existing technology has the following defects: when the voltage continues to rise, the method of increasing the DC bus voltage will not be applicable, which will cause the wind turbines to fall out in a relatively high voltage range. The risk of the power grid brings a greater risk to the normal operation of the power grid; and increasing the voltage of the DC bus will increase the failure rate of power electronic devices such as transistors and reduce the safety and stability of the wind turbine operation

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