Method and system for controlling brake circuit of wind power converter

A wind power converter and braking circuit technology, applied in the field of wind power, can solve the problems such as the inability to ensure the safety of the wind power converter system and the inability to effectively protect the braking circuit braking resistance, etc., and achieve the effect of uniform output and reasonable distribution

Active Publication Date: 2019-03-08
BEIJING ETECHWIN ELECTRIC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing technology lacks finer management of the braking circuit and cannot effectively pro...

Method used

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  • Method and system for controlling brake circuit of wind power converter
  • Method and system for controlling brake circuit of wind power converter
  • Method and system for controlling brake circuit of wind power converter

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Embodiment Construction

[0017] The present invention may have various modifications and various embodiments, and it should be understood that the present invention is not limited to these embodiments, but includes all modifications, equivalents and replacements within the spirit and scope of the present invention. For example, the order of operations described herein are examples only, and are not limited to those orders set forth herein, but, except for operations that must occur in a particular order, may be as would be after understanding the disclosure of the present application. Clearly changed that way. Also, descriptions of features that are known in the art may be omitted for increased clarity and conciseness. The terms used in the example embodiments of the present invention are for describing specific embodiments only, and are not intended to limit the example embodiments. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly dictat...

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PUM

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Abstract

The invention provides a method and system for controlling a brake circuit of a wind power converter. The method comprises the following steps: assigning the duty ratio of a control signal of each brake circuit for each of the at least one brake circuit according to total brake power; calculating real-time temperature of a brake resistor in each brake circuit and real-time brake power of each brake circuit; according to the real-time temperature of the brake resistor in each brake circuit, calculating braking energy that can be absorbed by each brake circuit in the case of reaching safety boundary temperature of each brake resistor; and calculating allowable running time of each brake circuit. The allowable running time of any one of the brake circuits is a specific value between the braking energy that can be absorbed by any one of the brake circuits and the real-time brake power of any one of the brake circuits; the duty ratio of the control signal of each brake circuit is adjusted based on the allowable running time of each brake circuit so as to ensure safe operation of each brake circuit and invariability of the total brake power.

Description

technical field [0001] The following description relates to the field of wind power, more specifically, to a method and system for controlling a braking circuit of a wind power converter. Background technique [0002] In wind power generation technology (for example, full-power direct-drive wind power generation technology), during the fault ride-through process of the AC grid end of the wind power converter, the brake circuit (chopper, the brake circuit is generally composed of a brake resistor and a brake insulation The gate bipolar transistor (IGBT) is put into operation, and the excess energy generated by the wind turbine on the DC bus is released to ensure that the wind turbine does not run off-grid during the voltage drop of the AC grid. [0003] In addition, when the DC bus voltage of the wind power converter rises abnormally, the brake circuit is also put into operation to ensure the safety of the wind power converter system. [0004] However, the prior art lacks fi...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/12H02M5/458
CPCH02J3/386H02J3/12H02M5/4585Y02E10/76
Inventor 符松格
Owner BEIJING ETECHWIN ELECTRIC
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