Power unit detection device

Abstract

The utility model discloses a power unit detection device. A power unit amplification device comprises a voltage regulation rectification module, a main control module and a processing module. The voltage regulating and rectifying module is electrically connected with a direct-current bus of the power unit and is used for inputting rated direct-current bus voltage to the power unit; the main control module is in communication connection with the control end of the power unit and is used for inputting a trigger signal to the power unit so as to control the working state of a transistor in the power unit; the processing module is electrically connected with the output end of the power unit, and is used for obtaining the actual waveform signal output by the power unit, and determining whether the power unit breaks down or not according to the actual waveform signal and a preset waveform signal. By adopting the technical means, the actual waveform signal output by the power unit is obtained through the processing module, whether the power unit breaks down or not can be determined by analyzing the deviation between the actual waveform signal and the preset waveform signal, then detection of the power unit is achieved, and the reliability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of power unit detection, in particular to a power unit detection device. Background Art

[0002] The inverter is an electric energy control device that uses the on-off function of power semiconductor devices to convert industrial frequency power into another frequency. At present, the market size of high-voltage inverters has maintained a high growth rate; the market for high-voltage inverters with high-efficiency and energy-saving functions will continue to grow.

[0003] The power unit is an important component of the high-voltage inverter. At present, after a power unit fails, it is usually replaced with a new one. However, before replacing the power unit, there is no corresponding integrity monitoring method for the new power unit spare parts, and only a rough judgment can be made through visual inspection. If there is an unknown fault in the internal transistor, after it is installed in the on-site equipment, it will cause the unit startup to be delayed at the least, affecting the efficiency of the power plant, and at worst, it will cause the fault to expand and affect the safety of the entire inverter.

[0004] Therefore, in view of the above technical problems, it is urgently necessary to propose a power unit detection device to detect the performance of the power unit. Utility Model Content

[0005] The embodiment of the utility model provides a power unit detection device for detecting whether a power unit fails. The device has a simple structure and high detection accuracy.

[0006] The embodiment of the utility model provides a power unit detection device, comprising: a voltage regulating and rectifying module, a main control module and a processing module;

[0007] The voltage regulating and rectifying module is electrically connected to the DC bus of the power unit and is used to input a rated DC bus voltage to the power unit;

[0008] The main control module is in communication connection with the control end of the power unit, and is used to input a trigger signal to the power unit to control the working state of the transistor in the power unit;

[0009] The processing module is electrically connected to the output end of the power unit, and is used to obtain an actual waveform signal output by the power unit, and determine whether the power unit fails according to the actual waveform signal and a preset waveform signal.

[0010] Optionally, the power unit includes a DC voltage supply subunit, an inverter unit and a rectifier unit; the inverter unit includes a first inverter bridge arm, a second inverter bridge arm, a third inverter bridge arm and a fourth inverter bridge arm; the rectifier unit includes a first rectifier bridge arm, a second rectifier bridge arm, a third rectifier bridge arm, a fourth rectifier bridge arm, a fifth rectifier bridge arm and a sixth rectifier bridge arm; the output end of the first inverter bridge arm is electrically connected to the input end of the third inverter bridge arm, the output end of the second inverter bridge arm is electrically connected to the input end of the fourth inverter bridge arm, the output end of the first rectifier bridge arm is electrically connected to the input end of the fourth rectifier bridge arm, the output end of the second rectifier bridge arm is electrically connected to the input end of the fifth rectifier bridge arm, and the output end of the third rectifier bridge arm is electrically connected to the input end of the sixth rectifier bridge arm;

[0011] One end of the DC voltage supply subunit is electrically connected to the input end of the first inverter bridge arm, the input end of the second inverter bridge arm, the input end of the first rectifier bridge arm, the input end of the second rectifier bridge arm, and the input end of the third rectifier bridge arm; the other end of the DC voltage supply subunit is electrically connected to the output end of the third inverter bridge arm, the output end of the fourth inverter bridge arm, the output end of the fourth rectifier bridge arm, the output end of the fifth rectifier bridge arm, and the output end of the sixth rectifier bridge arm;

[0012] The power unit detection device further includes: a discharge module; one end of the discharge module is electrically connected to the DC voltage supply sub-unit, and the other end of the discharge module is grounded, for releasing the voltage in the DC voltage supply sub-unit.

[0013] Optionally, the processing module is electrically connected to an AC side of an inverter subunit in the power unit.

[0014] Optionally, the processing module is electrically connected to the AC side of the inverter subunit and the AC side of the rectifier subunit in the power unit respectively.

[0015] Optionally, the main control module is communicatively connected to the control end in the power unit via an optical fiber.

[0016] Optionally, the voltage regulating and rectifying module includes a voltage regulating unit and a rectifying unit;

[0017] The output end of the voltage regulating unit is electrically connected to the input end of the rectifying unit, and the output end of the rectifying unit is electrically connected to the DC power supply subunit.

[0018] Optionally, the discharge module includes a discharge resistor.

[0019] Optionally, the processing module includes a waveform display unit.

[0020] Optionally, the power unit detection device further includes: an interaction module;

[0021] The interaction module is used to receive interaction instructions from users;

[0022] The main control module is electrically connected to the interaction module, and is used to output the trigger signal according to the interaction instruction.

[0023] Optionally, the voltage regulating and rectifying module, the main control module and the processing module are arranged in the same housing.

[0024] According to the technical solution of the embodiment of the utility model, the power unit detection device includes a voltage regulating and rectifying module, a main control module and a processing module. The voltage regulating and rectifying module is electrically connected to the DC bus of the power unit to convert the AC power into the DC bus voltage to supply power to the power unit. The main control module is communicatively connected to the control end of the power unit and inputs a trigger signal to the control end of the transistor in the power unit to control the on or off of the transistor in the power unit. The processing module is electrically connected to the output end of the power unit to obtain the actual waveform signal output by the power unit, and determine whether the power unit is faulty based on the actual waveform signal and the preset waveform signal when the power unit is working normally, that is, the detection of the power unit can be realized. The device has a simple structure and high detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the structure of a power unit detection device provided by an embodiment of the utility model;

[0026] Figure 2 A schematic diagram of the electrical principle of a power unit provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0028] At present, for power units that are partially soaked with water due to cooling system leakage, and power units that are bypassed due to communication signal interference or other reasons when the inverter is running, it is impossible to confirm on site whether they are suitable for continued use or can be used after treatment, and they can only be returned to the factory. Since power units are expensive, returning them to the factory will result in great loss of time and cost. In addition, among the preventive maintenance items of the inverter, there are only simple inspection items such as appearance inspection and overall cleaning for the power unit, and it is impossible to perform experimental items to verify its availability. Therefore, the current preventive maintenance has a very limited effect on the power unit.

[0029] In order to solve the above problems, an embodiment of the utility model proposes a power unit detection device. The technical solution of the embodiment of the utility model is described in detail below.

[0030] Figure 1 A schematic diagram of the structure of a power unit detection device provided by an embodiment of the utility model is shown in FIG. Figure 1 As shown, the power unit detection device 100 includes a voltage regulating and rectifying module 10, a main control module 20 and a processing module 30; the voltage regulating and rectifying module 10 is electrically connected to the DC bus of the power unit 40, and is used to input a rated DC bus voltage to the power unit 40; the main control module 20 is communicatively connected to the control end of the power unit 40, and is used to input a trigger signal to the power unit 40 to control the working state of the transistor in the power unit 40; the processing module 30 is electrically connected to the output end of the power unit 40, and is used to obtain an actual waveform signal output by the power unit 40, and determine whether the power unit 40 is faulty based on the actual waveform signal and the preset waveform signal.

[0031] Specifically, the voltage regulating and rectifying module 10 is electrically connected to the DC bus of the power unit 40, and the voltage regulating and rectifying module 10 is used to convert the external AC voltage into the DC bus voltage, so as to provide the rated DC voltage signal for the power unit 40, thereby ensuring the offline test of the operating state of the power unit 40. Exemplarily, the AC voltage input to the voltage regulating and rectifying module 10 can be 380V, that is, after the AC voltage is regulated and rectified, a DC voltage of 2500V can be output.

[0032] Specifically, the main control module 20 is connected to the control end of the power unit 40 by communication, and the main control module 20 inputs a trigger signal to the power unit 40 to control the working state of the transistor in the power unit 40. It can be understood that the working state of the transistor can be on or off. The trigger signal can be understood as a signal that controls the transistor in the power unit 40 to be turned on or off.

[0033] Exemplarily, the transistors in the power unit 40 may be insulated-gate bipolar transistors (IGBTs). The IGBT includes a gate, a collector, and an emitter. The gate of each transistor may be used as a control terminal to receive a trigger signal output by the main control module 20, and the working state of each transistor may be determined according to the trigger signal.

[0034] Specifically, the processing module 30 is electrically connected to the output end of the power unit 40. The processing module 30 can receive the actual waveform signal output by the power module 30, and the processing module 30 can also determine whether the power unit 40 is faulty based on the deviation between the actual waveform signal and the preset waveform signal. In this way, the feasibility of the power unit 40 before replacement, after failure, and in the preventive maintenance stage can be detected.

[0035] The power unit detection device provided by the embodiment of the utility model includes a voltage regulating and rectifying module, a main control module and a processing module. The voltage regulating and rectifying module is electrically connected to the DC bus of the power unit to convert the AC power into the DC bus voltage to realize the power supply to the power unit. The main control module is communicatively connected to the control end of the power unit, and inputs a trigger signal to the control end of the transistor in the power unit to control the conduction or shutdown of the transistor in the power unit. The processing module is electrically connected to the output end of the power unit, and is used to obtain the actual waveform signal output by the power unit, and determine whether the power unit is faulty based on the actual waveform signal and the preset waveform signal when the power unit is working normally, that is, the detection of the power unit can be realized. The device has a simple structure and high detection accuracy.

[0036] Optional, Figure 2 A schematic diagram of the electrical principle of a power unit provided by an embodiment of the utility model, referring to Figure 1 and Figure 2The power unit 40 includes a DC voltage supply subunit 401, an inverter unit 402 and a rectifier unit 403; the inverter unit 402 includes a first inverter bridge arm 4021, a second inverter bridge arm 4022, a third inverter bridge arm 4023 and a fourth inverter bridge arm 4024; the rectifier unit 403 includes a first rectifier bridge arm 4031, a second rectifier bridge arm 4032, a third rectifier bridge arm 4033, a fourth rectifier bridge arm 4034, a fifth rectifier bridge arm The output end of the first inverter bridge arm 4021 is electrically connected to the input end of the third inverter bridge arm 4023, the output end of the second inverter bridge arm 4022 is electrically connected to the input end of the fourth inverter bridge arm 4024, the output end of the first rectifier bridge arm 4031 is electrically connected to the input end of the fourth rectifier bridge arm 4034, the output end of the second rectifier bridge arm 4032 is electrically connected to the input end of the fifth rectifier bridge arm 4035, and the output end of the third The output end of the rectifier bridge arm 4033 is electrically connected to the input end of the sixth rectifier bridge arm 4036; one end of the DC voltage supply sub-unit 401 is electrically connected to the input end of the first inverter bridge arm 4021, the input end of the second inverter bridge arm 4022, the input end 4031 of the first rectifier bridge arm, the input end 4032 of the second rectifier bridge arm and the input end of the third rectifier bridge arm 4033; the other end of the DC voltage supply sub-unit 401 is electrically connected to the output end of the third inverter bridge arm 4023, the output end of the fourth inverter bridge arm 4024, the output end of the fourth rectifier bridge arm 4034, the output end of the fifth rectifier bridge arm 4035 and the output end of the sixth rectifier bridge arm 4036; the power unit detection device 100 also includes: a discharge module 50; one end of the discharge module 50 is electrically connected to the DC voltage supply sub-unit 401, and the other end of the discharge module 50 is grounded, which is used to release the voltage in the DC voltage supply sub-unit 401.

[0037] Specifically, the power unit, as the main part of the main circuit of the high-voltage inverter, is a high-voltage inverter component that uses power electronic devices for rectification, filtering, and inversion. The power unit is a basic AC-DC-AC single-phase inverter circuit. The rectifier unit 403, that is, the rectifier side is six diodes to achieve three-phase full-wave rectification. The waveform can be obtained by controlling the IGBT inverter bridge with sinusoidal pulse width modulation (PWM). Each power unit is exactly the same and can be interchanged. This is not only convenient for debugging and maintenance, but also very economical for backup. If a unit fails, the output end of the unit can automatically control the two upper bridges of the IGBT to conduct through software to bypass the faulty unit, and the whole machine can work at a reduced rating without affecting operation.

[0038] Specifically, the DC voltage supply sub-unit 401 can be a capacitor, and the external AC voltage is converted into a rated DC bus voltage after passing through the voltage regulating and rectifying module 10, and the rated DC bus voltage can be stored in the capacitor, so that the capacitor can be used as a DC voltage source to power the entire power unit 40. It should be noted that by providing a discharge module 50, one end of the discharge module 50 is electrically connected to the DC voltage supply sub-unit 401, and the other end of the discharge module 50 is grounded, it can be ensured that after the detection is completed, the voltage in the DC voltage supply sub-unit 401 is quickly released to a safe voltage, which can improve the detection efficiency on the one hand, and ensure the safety of the detection personnel on the other hand.

[0039] Optionally, the discharge module 50 may be a discharge resistor. It is understandable that the resistance of the discharge resistor may be selected according to the voltage value in the DC voltage supply sub-unit 401 .

[0040] Optional, continue to refer to Figure 1 and Figure 2 The processing module 30 is electrically connected to the AC side of the inverter subunit 402 in the power unit 40 .

[0041] Specifically, the processing module 30 is electrically connected to the AC side of the inverter subunit 402 in the power unit 40, so that the processing module 30 can obtain the actual waveform signal output by the AC side of the inverter subunit 402, and can determine the performance of the transistor in the inverter subunit 402 in the power unit based on the deviation between the actual waveform signal and the preset waveform signal when the inverter subunit 402 is working normally.

[0042] Optional, continue to refer to Figure 1 and Figure 2 The processing module 30 is electrically connected to the AC side of the inverter unit 402 and the AC side of the rectifier unit 403 in the power unit 40 respectively.

[0043] Specifically, the processing module 30 is electrically connected to the AC side of the inverter unit 402 and the AC side of the rectifier unit 403, respectively. In this way, the processing module 30 can not only obtain the actual waveform signal output from the AC side of the inverter unit 402, and determine the performance of the transistor in the inverter unit 402 in the power unit according to the deviation between the actual waveform signal and the preset waveform signal when the inverter unit 402 is working normally, but also obtain the actual waveform signal output from the AC side of the rectifier unit 403, and determine the performance of the transistor in the rectifier unit 403 in the power unit according to the deviation between the actual waveform signal and the preset waveform signal when the rectifier unit 403 is working normally, thereby comprehensively detecting the performance of the power unit.

[0044] Optional, continue to refer to Figure 1 and Figure 2The main control module 10 is communicatively connected with the control end in the power unit 40 via optical fiber.

[0045] Specifically, fiber optic communication uses optical signals to transmit information. Compared with electrical transmission, optical communication has better anti-interference ability and can resist electromagnetic fields, radio frequency interference, and electrical noise, etc., and fiber optic transmission has a long distance and a wide coverage.

[0046] It is understandable that the power unit 40 includes a control board interface, and the main control module 10 is connected to the control interface via an optical fiber, thereby enabling communication connection between the main control module 10 and the power unit 40 .

[0047] Optional, continue to refer to Figure 1 The voltage regulating and rectifying module 10 includes a voltage regulating unit 101 and a rectifying unit 102 ; the output end of the voltage regulating unit 102 is electrically connected to the input end of the rectifying unit 102 , and the output end of the rectifying unit 102 is electrically connected to the DC power supply subunit 401 .

[0048] Specifically, the voltage regulating unit 101 may be a voltage regulator, which controls the flow of AC power to maintain voltage stability, thereby protecting other components in the circuit. The rectifying unit 102 may be a rectifier, which ensures that the power unit 40 works normally by converting AC power into DC power.

[0049] Optionally, the AC power supply module 60 is electrically connected to the input end of the voltage regulating unit 101. It is understandable that the AC power supply module 60 can be used nearby during on-site use.

[0050] Specifically, the AC power supply module 60 provides an AC voltage to the voltage regulating unit 101 . Exemplarily, the AC voltage input by the AC power supply module 60 to the voltage regulating unit 101 may be 380V to ensure the normal operation of the voltage regulating and rectifying module 10 .

[0051] It should be noted that, continue to refer to Figure 1 and Figure 2When the power unit needs to be tested, the power unit can be pulled out of the frequency conversion cabinet and placed in a safe position; then the AC power supply module 60 near the site is used to power the voltage regulating rectifier module 10, and then the communication optical fiber of the power unit detection device is connected to the control end of the power unit, so as to input a trigger signal to the control end of the power unit through the main control module 20; the processing module 30 is connected to the AC side of the inverter subunit 402 to detect the performance of the transistor in the inverter subunit 402, or the processing module 30 is connected to the AC side of the inverter subunit 402 and the AC side of the rectifier subunit 403, so as to comprehensively detect the performance of each transistor in the power unit 40; the processing module 30 obtains the actual waveform signal, determines whether the IGBT is turned on and off as expected, and determines whether the power unit has a fault according to the deviation between the actual waveform signal and the preset waveform signal; after the detection is completed, the DC voltage is released through the discharge module 50 to supply the voltage in the subunit 401 to a safe voltage.

[0052] Optional, continue to refer to Figure 1 , the processing module 30 includes a waveform display unit.

[0053] Specifically, the processing module 30 includes a waveform display unit to display the waveform for the convenience of user viewing and analysis.

[0054] Optional, continue to refer to Figure 1 The power unit detection device 100 further includes: an interaction module 70; the interaction module 70 is used to receive the user's interaction instruction; the main control module 20 is electrically connected to the interaction module 70, and is used to output a trigger signal according to the interaction instruction.

[0055] Specifically, the interaction module 70 can be understood as a human-computer interaction interface. The user inputs interaction instructions to the interaction module 70 so that the main control module 20 outputs a trigger signal according to the interaction instructions, thereby controlling the working state of the transistor in the power unit 40.

[0056] It is understandable that the interaction unit 70 can also display control parameters and test results of the power unit 40 and the like.

[0057] Optional, continue to refer to Figure 1 The voltage regulating and rectifying module 10 , the main control module 20 and the processing module 30 are arranged in the same housing 80 .

[0058] Specifically, the voltage regulating rectifier module 10, the main control module 20 and the processing module 30 are arranged in the same shell 80, that is, the voltage regulating rectifier module 10, the main control module 20 and the processing module 30 are installed in the box, which is convenient for carrying and testing the power unit on site; on the other hand, it can realize the integrated setting of the power unit detection device.

[0059] Exemplarily, the discharge module, the AC power supply module and the interaction module may also be disposed in the housing.

[0060] Optionally, the power unit detection device may further include a DC power supply, which is electrically connected to the main control module and is used to provide a DC voltage to the main control module. Exemplarily, the power of the DC power supply may be 50W, and the DC voltage output by the DC power supply to the main control module may be 24V to ensure the normal operation of the main control module.

[0061] In summary, the voltage regulating and rectifying module in the power unit detection device provided in the embodiment of the utility model is electrically connected to the DC bus of the power unit, converts the AC power into the DC bus voltage, and realizes the power supply to the power unit. The main control module is communicatively connected to the control end of the power unit, and inputs a trigger signal to the control end of the transistor in the power unit to control the conduction or shutdown of the transistor in the power unit. The processing module is electrically connected to the output end of the power unit, and is used to obtain the actual waveform signal output by the power unit, and determine whether the power unit is faulty based on the actual waveform signal and the preset waveform signal when the power unit is working normally, that is, the detection of the power unit can be realized, and the device has a simple structure and high detection accuracy. In addition, the device in the power unit detection device provided in the embodiment of the utility model is compact and portable, which can meet complex on-site use requirements.

[0062] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A power unit detection device, characterized in that: include: Voltage regulating and rectifying module, main control module and processing module; The voltage regulating and rectifying module is electrically connected to the DC bus of the power unit and is used to input a rated DC bus voltage to the power unit; The main control module is in communication connection with the control end of the power unit, and is used to input a trigger signal to the power unit to control the working state of the transistor in the power unit; The processing module is electrically connected to the output end of the power unit, and is used to obtain an actual waveform signal output by the power unit, and determine whether the power unit fails according to the actual waveform signal and a preset waveform signal.

2. The power unit detection device according to claim 1, characterized in that: The power unit includes a DC voltage supply subunit, an inverter unit and a rectifier unit; the inverter unit includes a first inverter bridge arm, a second inverter bridge arm, a third inverter bridge arm and a fourth inverter bridge arm; the rectifier unit includes a first rectifier bridge arm, a second rectifier bridge arm, a third rectifier bridge arm, a fourth rectifier bridge arm, a fifth rectifier bridge arm and a sixth rectifier bridge arm; the output end of the first inverter bridge arm is electrically connected to the input end of the third inverter bridge arm, the output end of the second inverter bridge arm is electrically connected to the input end of the fourth inverter bridge arm, the output end of the first rectifier bridge arm is electrically connected to the input end of the fourth rectifier bridge arm, the output end of the second rectifier bridge arm is electrically connected to the input end of the fifth rectifier bridge arm, and the output end of the third rectifier bridge arm is electrically connected to the input end of the sixth rectifier bridge arm; One end of the DC voltage supply subunit is electrically connected to the input end of the first inverter bridge arm, the input end of the second inverter bridge arm, the input end of the first rectifier bridge arm, the input end of the second rectifier bridge arm, and the input end of the third rectifier bridge arm; the other end of the DC voltage supply subunit is electrically connected to the output end of the third inverter bridge arm, the output end of the fourth inverter bridge arm, the output end of the fourth rectifier bridge arm, the output end of the fifth rectifier bridge arm, and the output end of the sixth rectifier bridge arm; The power unit detection device further includes: a discharge module; one end of the discharge module is electrically connected to the DC voltage supply sub-unit, and the other end of the discharge module is grounded, for releasing the voltage in the DC voltage supply sub-unit.

3. The power unit detection device according to claim 1, characterized in that: The processing module is electrically connected to the AC side of the inverter subunit in the power unit.

4. The power unit detection device according to claim 1, characterized in that: The processing module is electrically connected to the AC side of the inverter subunit and the AC side of the rectifier subunit in the power unit respectively.

5. The power unit detection device according to claim 1, characterized in that: The main control module is communicatively connected with the control end in the power unit via an optical fiber.

6. The power unit detection device according to claim 2, characterized in that: The voltage regulating and rectifying module comprises a voltage regulating unit and a rectifying unit; The output end of the voltage regulating unit is electrically connected to the input end of the rectifying unit, and the output end of the rectifying unit is electrically connected to the DC power supply subunit.

7. The power unit detection device according to claim 2, characterized in that: The discharge module includes a discharge resistor.

8. The power unit detection device according to claim 1, characterized in that: The processing module includes a waveform display unit.

9. The power unit detection device according to claim 1, characterized in that: The power unit detection device further includes: an interaction module; The interaction module is used to receive interaction instructions from users; The main control module is electrically connected to the interaction module, and is used to output the trigger signal according to the interaction instruction.

10. The power unit detection device according to claim 1, characterized in that: The voltage regulating and rectifying module, the main control module and the processing module are arranged in the same housing.

Images