Wind power converter insulation detection circuit and method, wind power converter
A technology for wind power converters and detection circuits, which is applied to test circuits, AC network circuits, wind power generation, etc., can solve the problems of low insulation detection efficiency, safety risks, time-consuming and labor-intensive, etc., so as to improve insulation detection efficiency and reduce manpower. and time cost effects
Active Publication Date: 2021-05-25
BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD
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Problems solved by technology
[0004] However, the manual detection method requires the staff to carry heavy equipment to the site to measure in person, which is not only time-consuming and laborious, the insulation detection efficiency is low, and there are safety risks
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[0033] Features and exemplary embodiments of various aspects of the invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention.
[0034] figure 1 It is a schematic diagram of the grid-connected structure of the wind power generating set involved in the embodiment of the present invention. Such as figure 1 As shown, a converter is provided between the wind power generating set and the grid, and the converter includes a rectifier 102 , a braking unit 103 and an inverter 104 in sequence from the machine side to the grid side.
[0035] Wherein, the rectifier 102 is used for rectifying the three-phase alternating current generated by the generator 101 of the wind power generating set, and the inverter 104 is used for re-converting the rectified direct current into three-phase alternating current and incorporating it into the grid. The braking uni...
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The invention discloses a wind power converter insulation detection circuit and method, and a wind power converter. The insulation detection circuit includes: a power supply module, a current detection module, a switch module and a controller; wherein, the positive terminal of the power supply module is connected to the current detection module The first terminal of the power supply module is connected to the voltage reference terminal; the first terminal and the second terminal of the switch module are respectively connected to the positive terminal and negative terminal of the DC bus of the converter; the third terminal of the switch module, The fourth terminal and the fifth terminal are respectively connected to the a-phase branch, b-phase branch and c-phase branch of the converter network side, and the controller is configured to control the switch module so that the positive terminal and / or negative terminal of the DC bus The terminal is short-circuited with the grid-side load of at least one phase branch among the a-phase branch, b-phase branch and c-phase branch, and according to the current value provided by the current detection module, the current value of the converter in the short-circuit state is calculated Insulation resistance. By adopting the embodiment of the invention, the insulation resistance value of the wind power converter can be detected online, and the insulation detection efficiency is improved.
Description
technical field [0001] The invention relates to the technical field of wind power generation, in particular to a wind power converter insulation detection circuit and method, and a wind power converter. Background technique [0002] The wind power converter is the core component of the grid-connected power of the wind turbine. In the actual wind farm, the wind turbine may be placed for a long period of time after being hoisted, or the internal components of the converter may be damaged due to power cuts during operation. It takes a period of time to resume operation during power outage maintenance, power failure of a certain line of the owner, etc., resulting in moisture problems. [0003] Therefore, before the wind turbine is powered on, it needs to be heated for a long time, such as 24 hours or 48 hours, and then the insulation resistance of the converter is manually detected. If the insulation resistance reaches the standard, the main circuit of the converter is allowed t...
Claims
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IPC IPC(8): G01R31/14G01R31/12G01R27/02G01R27/16H02J3/38
CPCG01R27/025G01R27/16G01R31/1227G01R31/14H02J3/386Y02E10/76
Inventor 高绪华赵新龙杨志千
Owner BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD