Broken line detection method and detection device for standby power supply of variable pitch of fan

A backup power supply and disconnection detection technology, which is applied in the direction of power supply testing, measuring devices, measuring electricity, etc., can solve problems such as narrow range, small charging current, and few detection times, so as to reduce the impact on life, stable and reliable detection, and easy engineering effect

Pending Publication Date: 2022-07-29
SHENZHEN MICCTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When charging for the first time, the disconnection detection is performed, which is a non-real-time detection method, and the number of detections is small, and the detection cannot be continued during subsequent use, and there is a greater risk
When the power supply is floating, due to the narrow range of intermittent charging voltage and small charging current, the change of charging voltage and charging current are affected by the accuracy of the detection circuit and the temperature characteristics of the device, and there is a possibility of false detection.
[0006] For the related technologies mentioned above, there is a defect that the detection of whether the backup power supply is disconnected is not accurate

Method used

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  • Broken line detection method and detection device for standby power supply of variable pitch of fan
  • Broken line detection method and detection device for standby power supply of variable pitch of fan
  • Broken line detection method and detection device for standby power supply of variable pitch of fan

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Embodiment 1

[0046] The embodiment of the present application discloses a method for detecting a disconnection of a fan pitch backup power supply. refer to figure 1 , The method for detecting the disconnection of the back-up power supply for variable pitch of the fan includes the following steps.

[0047] S1. Introduce a characteristic voltage signal between the sampling positive terminal and the sampling negative terminal.

[0048] The sampling positive terminal is the connection terminal between the positive pole of the backup power supply and the power supply positive pole of the rectified output of the three-phase power supply, and the sampling negative terminal is the connection terminal between the negative pole of the backup power supply and the power supply negative pole of the rectified output of the three-phase power supply. When the backup power supply is not connected, the characteristic voltage signal between the sampling positive terminal and the sampling negative terminal i...

Embodiment 2

[0057] The embodiment of the present application discloses a disconnection detection device for a fan pitch backup power supply. refer to figure 2 , The fan pitch backup power disconnection detection device includes a three-phase rectifier module 1, a backup switch module 2, a backup power module 3, a resistance voltage divider module 4, a differential operation module 5 and a main control module 6. The resistance voltage divider module 4 and the backup switch module 2 are sequentially connected between the three-phase rectifier module 1 and the backup power supply module 3, the differential operation module 5 is connected to the resistance voltage divider module 4, and the main control module 6 is connected to the differential operation module 5. . The output of the three-phase rectifier module 1 includes a positive bus bar 11 and a negative bus bar 12. The resistance voltage divider module 4 is connected to the positive bus bar 11 and the negative bus bar 12, and is also c...

Embodiment 3

[0068] refer to image 3 , the difference between the embodiment of the present application and the embodiment 2 is that a second blocking diode D4 is connected in series on the positive bus bar 11 to limit the current on the positive bus bar 11, so that the voltage between the negative bus bar 12 and the characteristic terminal is used as the characteristic voltage signal . The cathode of the second blocking diode D4 is connected to the output terminal of the three-phase rectifier module 1 where the positive bus 11 is located, and the anode of the second blocking diode D4 is connected to the sampling negative terminal.

[0069] And at this time, the resistor divider module 4 includes a third resistor R3 and a fourth resistor R4, the third resistor R3 is connected in series between the sampling positive terminal and the sampling negative terminal, and the fourth resistor R4 is connected in series between the sampling positive terminal and the characteristic terminal. . In th...

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Abstract

The invention relates to a fan variable pitch backup power supply disconnection detection method and detection device. The detection method comprises the following steps: introducing a characteristic voltage signal between a sampling positive end and a sampling negative end; acquiring a voltage waveform and a voltage frequency between the sampling positive end and the sampling negative end; judging whether the voltage waveform and the voltage frequency are matched with the characteristic voltage waveform and the characteristic voltage frequency or not; and determining whether the backup power supply is disconnected based on the judgment result. The method has the function of detecting whether the back-up power supply is disconnected in real time, the influence of the detection process on the service life of the back-up power supply is small, the detection is stable and reliable, and engineering is easy.

Description

technical field [0001] The application relates to the technical field of pitch control of wind turbines, and in particular, to a method and a detection device for disconnection of a fan pitch backup power supply. Background technique [0002] At present, most of the wind power industry uses three-blade wind turbine wind turbines, which are mainly composed of three blades, a hub and a tower. The working principle of the wind turbine is that the wind blows on the three blades, pushing the blades to rotate, and then driving the hub and the generator to rotate and generate electricity. Since the wind speed changes in real time in nature, in order to keep the generator in a stable full power generation state under the changing wind speed, the wind energy absorbed by the blades and the rotation speed of the three blades are changed by adjusting the pitch angle of the blades in real time. Control the amount of electricity generated by the generator. [0003] The wind turbine is e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/54G01R31/58G01R31/40
CPCG01R31/54G01R31/58G01R31/40
Inventor 张志斌
Owner SHENZHEN MICCTECH CO LTD
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