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Method for monitoring state of direct current bus capacitor of wind power converter based on variable discharge network

A technology for DC bus capacitors and wind power converters, applied in power transmission AC networks, measuring electrical variables, measuring resistance/reactance/impedance, etc. problem, to achieve the effect of low cost, accurate monitoring and simple method

Pending Publication Date: 2022-04-05
江苏国科智能电气有限公司 +1
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Problems solved by technology

Not only directly affects the utilization rate of wind energy by wind turbines, but also has a significant impact on grid connection
In power electronic systems, capacitors are one of the key components, but their failure rate in industrial applications has always been high, seriously affecting the reliability of power electronic systems. Scholars have made many innovations around system reliability design try

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  • Method for monitoring state of direct current bus capacitor of wind power converter based on variable discharge network
  • Method for monitoring state of direct current bus capacitor of wind power converter based on variable discharge network
  • Method for monitoring state of direct current bus capacitor of wind power converter based on variable discharge network

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Embodiment Construction

[0040] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly described below in conjunction with the accompanying drawings of the present invention.

[0041] figure 1It is a schematic diagram of the present invention. As shown in the figure, the method includes: planning the variable discharge network, using the variable discharge network to change the access mode of the variable discharge network when the converter stops working or the bus voltage drops, and using the voltage sensor and AD Convert the collected voltage, draw the voltage drop curve of the bus capacitor, and monitor the bus capacitor online. The bus voltage is detected by the voltage sensor, and the AD conversion circuit converts the signal, collects it into the CPU of the control board, judges the working status of the converter, and continues sampling until the voltage drops to ...

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Abstract

The invention provides a variable discharge network-based state monitoring method for a DC bus capacitor of a wind power converter. The method mainly comprises the following steps: circularly sampling and detecting bus voltage, judging whether a converter is shut down or not, changing a discharge path of a capacitor by utilizing a variable discharge network in a voltage drop stage of the converter, discharging the capacitor in two different states, drawing a discharge voltage curve, and calculating the capacitance and capacitance equivalent resistance by utilizing a CPU (Central Processing Unit). And judging whether the capacitor fails. When the converter works stably, power failure occurs, and the voltage drops rapidly, fault waveforms are recorded. The device structurally comprises a control panel, a protection circuit, a control circuit, a current signal acquisition and conversion circuit, a clock circuit and a variable discharge network circuit.

Description

technical field [0001] The invention relates to the technical field of on-line monitoring of the capacitor state of a wind power converter bus, in particular to a method for monitoring the state of a DC bus capacitor of a wind power converter based on a variable discharge network. Background technique [0002] In the new energy power generation system, the converter is its core component, and the fault of the converter is one of the main faults encountered in the power generation process. The components most likely to fail in the converter are power semiconductor devices and DC bus capacitors (DC-Link Capacitor). The DC-link capacitor mainly plays the role of balancing power in the converter, connecting two-stage converters, and smoothing voltage fluctuations. It not only directly affects the utilization rate of wind energy by wind turbines, but also has a significant impact on grid connection. In power electronic systems, capacitors are one of the key components, but thei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J13/00G01R27/26H02J3/36H02J3/38
CPCY02E10/56Y02E10/76Y02E40/70Y02E60/60Y04S10/123
Inventor 武鑫江国乾吕佃顺王立鹏马强赵栋利
Owner 江苏国科智能电气有限公司
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