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Temperature detection method and temperature detection system of braking resistor

A braking resistor and detection method technology, which is applied in the detection field, can solve problems such as overheating and burning of insulating parts, insufficient time for braking resistors, and fire of objects, and achieve high safety and reliability.

Active Publication Date: 2019-07-05
BEIJING ETECHWIN ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the braking resistor is started frequently, the braking resistor does not have enough time to cool down, causing the temperature of the braking resistor to rise continuously, eventually causing the braking resistor or the insulating parts near the braking resistor to overheat and burn, seriously causing damage to the braking resistor near the braking resistor. utensils caught fire and other consequences

Method used

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  • Temperature detection method and temperature detection system of braking resistor
  • Temperature detection method and temperature detection system of braking resistor
  • Temperature detection method and temperature detection system of braking resistor

Examples

Experimental program
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Effect test

Embodiment 1

[0022] figure 1 A schematic flow chart showing the method for detecting the temperature of the braking resistor in Embodiment 1 of the present invention is shown. see figure 1 , a method for detecting the temperature of a braking resistor includes S110, S120, S130 and S140.

[0023] At S110, the absorbed energy of the braking resistor within a sampling time interval is acquired, and the sampling time interval refers to a time interval from a previous sampling time to a current sampling time.

[0024] For frequency converters or converters using AC-DC-AC topology, a braking circuit is connected to the DC bus of the frequency converter or converter, and the braking circuit includes power electronic switches and braking resistors. Set the sampling time interval in advance as t, and the current sampling time as t i , the last sampling time is t i-1 , ie t i -t i-1 =t; for example, the sampling time interval t can be 1 second or 0.5 second and so on.

[0025] In this embodim...

Embodiment 2

[0055] figure 2 It shows a schematic structural diagram of a temperature detection system for a braking resistor of a wind power generating set in Embodiment 2 of the present invention. The system for detecting the temperature of the braking resistor of the wind power generating set provided in this embodiment implements the method for detecting the temperature of the braking resistor in the first embodiment in the wind generating set. see figure 2 , the temperature detection system includes a temperature detection device 210, a machine-side converter 220, a grid-side converter 230, a DC bus 240 and a brake circuit 250, and the DC bus 240 is connected between the machine-side converter 220 and the grid Between the side converters 230, the DC bus 240 is connected to the braking circuit 250, the braking resistor 260 is installed in the braking circuit 250, and the temperature detection device 210 is connected to the braking circuit 250 , the temperature detection device 210 ...

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PUM

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Abstract

The invention provides a brake resistor temperature detection method and temperature detection system. The brake resistor temperature detection method comprises steps of obtaining absorption energy of the brake resistor during a sampling time interval, determining a temperature increase value of the brake resistor during the sampling time interval according to the absorption energy, determining a temperature reduction value according to the temperature of the brake resistor at the last moment, a temperature increase value, environment temperature of a current sampling moment and the sampling time interval and determining the temperature of the brake resistor at the current sampling moment according to the temperature of the resistor at the last sampling moment, the temperature increase value and the temperature reduction value. The brake resistor temperature detection method and temperature detection system can realize contactless measurement and has high reliability.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to a temperature detection method and a temperature detection system of a braking resistor. Background technique [0002] The wind turbine includes a machine-side converter and a grid-side converter. The DC bus is connected between the machine-side converter and the grid-side converter. In order to ensure that the bus voltage of the DC bus is within the safe voltage range, it is necessary to The brake circuit is connected to the DC bus of the converter. The braking circuit includes a braking resistor and a power electronic switch. When the bus voltage is detected to exceed the braking voltage threshold, the power electronic switch is closed, and the braking resistor works to consume the energy on the DC bus to ensure that the bus voltage is within a safe voltage range. Inside; when the bus voltage drops to the safe voltage threshold, the power electronic switch is turned on, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/00
CPCG01K11/00
Inventor 郭锐高瑞马忠宝
Owner BEIJING ETECHWIN ELECTRIC