Alternating-current electric control cabinet of auxiliary module of heavy-duty gas turbine

Abstract

The utility model relates to a heavy duty gas turbine auxiliary module alternating current electric control cabinet, and relates to the technical field of electric control cabinets. The auxiliary module alternating current electric control cabinet of the heavy duty gas turbine comprises a cabinet body, a frequency converter, a main power supply, an uninterruptible power supply, a fault detection module, a control module and a power supply switching module, the main power supply is used for supplying power to the frequency converter, and the uninterruptible power supply is used for supplying power to the frequency converter. The fault detection module and the power supply switching module are both controlled by the control module, the fault detection module is used for detecting whether the main power supply fails or not, and the control module is used for switching the main power supply when the fault detection module detects that the main power supply fails. And controlling the power supply switching module to switch the output of the frequency converter from the main power supply to the output of the uninterruptible power supply. According to the invention, when the main power supply in the electric control cabinet breaks down, the frequency converter can still operate normally.

Description

Technical Field

[0001] This application relates to the field of electrical control cabinet technology, and in particular to an AC electrical control cabinet for a heavy-duty gas turbine auxiliary module. Background Technology

[0002] A gas turbine is an internal combustion engine that uses a continuously flowing gas as its working fluid to drive a high-speed rotating impeller, converting the energy of fuel into useful work. It is a type of rotating impeller-type thermal engine. When using a gas turbine, it is typically controlled via an electrical control cabinet.

[0003] Existing technology includes an AC control cabinet for a heavy-duty gas turbine auxiliary module, comprising a control cabinet and a frequency converter. The frequency converter is installed inside and electrically connected to the control cabinet, allowing the main power supply within the control cabinet to directly power the frequency converter. The frequency converter is hardwired to the control circuit within the heavy-duty gas turbine auxiliary module, and the motor within the module is controlled by this circuit. The frequency converter converts the incoming current into AC power with adjustable frequency and voltage to facilitate power supply and control of the motor within the heavy-duty gas turbine. In operation, the power supply frequency is changed via the frequency converter control board, thereby altering the speed of the motor within the heavy-duty gas turbine auxiliary module.

[0004] Regarding the aforementioned technologies, since the frequency converters in the existing technology are installed inside the electrical control cabinet and are directly powered by the main power supply of the electrical control cabinet, when the main power supply fails and it becomes difficult to power the frequency converter, the frequency converter will stop working, causing the heavy-duty gas turbine auxiliary module to stop working, thereby reducing the working efficiency of the heavy-duty gas turbine auxiliary module. Therefore, improvements are needed. Utility Model Content

[0005] To ensure that the frequency converter can still operate normally after the main power supply in the control cabinet fails, this application provides a heavy-duty gas turbine auxiliary module AC control cabinet.

[0006] This application provides an AC electrical control cabinet for a heavy-duty gas turbine auxiliary module, which adopts the following technical solution:

[0007] A heavy-duty gas turbine auxiliary module AC control cabinet includes a cabinet, a frequency converter, and a main power supply. The main power supply powers the frequency converter. The cabinet also includes an uninterruptible power supply (UPS), a fault detection module, a control module, and a power switching module. The UPS powers the frequency converter. Both the fault detection module and the power switching module are controlled by the control module. The fault detection module detects whether the main power supply has failed. When the fault detection module detects a fault in the main power supply, the control module controls the power switching module to switch the frequency converter's output from the main power supply to the UPS.

[0008] By adopting the above technical solution, compared with the prior art where only the main power supply of the electrical control cabinet directly supplies power to the frequency converter, the frequency converter will stop working when the main power supply fails and it is difficult to supply power to the frequency converter, thus causing the heavy-duty gas turbine auxiliary module to stop working and reducing the working efficiency of the heavy-duty gas turbine auxiliary module; the setting of the uninterruptible power supply, fault detection module, control module and power switching module in this application enables the fault detection module to detect whether the main power supply has failed, so that the control module can control the power switching module to switch the frequency converter from the main power supply output to the uninterruptible power supply output when the main power supply fails, so that the frequency converter can continue to work, and thus the heavy-duty gas turbine auxiliary module can still work normally, effectively ensuring the working efficiency of the heavy-duty gas turbine auxiliary module.

[0009] Preferably, the cabinet has several heat dissipation slots on its side walls and a switching mechanism is provided on the cabinet. The switching mechanism includes a switching assembly and several switching plates. The switching plates correspond to the heat dissipation slots and are used to close the corresponding heat dissipation slots. The switching plates are slidably connected to the cabinet. The switching assembly is used to drive each corresponding switching plate to slide.

[0010] By adopting the above technical solution and setting the switching mechanism, the switching assembly can drive each switching plate to slide, thereby releasing the switch plate from the closed state of the heat dissipation slot. This allows the hot air inside the electrical control cabinet to circulate to the outside, thereby achieving heat dissipation of the electrical control cabinet cavity and effectively reducing the probability of damage to electronic components inside the electrical control cabinet due to overheating.

[0011] Preferably, the switch assembly includes a drive element, a gear, and a rack. The rack is slidably connected to the cabinet and its sliding direction is the same as that of the switch plate. The rack is connected to each of the switch plates. The gear is rotatably connected to the cabinet. The drive element is used to drive the gear to rotate. The gear meshes with the rack.

[0012] By adopting the above technical solution and specifically configuring the switch assembly, the driving component can drive the gear to rotate, thereby causing the gear to slide the rack, which in turn causes the rack to slide each switch plate, thus releasing the switch plate from the heat dissipation slot and enabling the driving of each switch plate, effectively facilitating the sliding of the switch plate.

[0013] Preferably, the system also includes a temperature detection module for detecting the temperature of the internal cavity of the cabinet, and the control module for controlling the opening and closing of the drive component based on the data detected by the temperature detection module.

[0014] By adopting the above technical solution and configuring the temperature detection module, the temperature detection module can detect the temperature inside the cabinet. When the temperature inside the cabinet is too high, the control module can control the drive component to work, which in turn drives the gear to rotate, thereby driving the switch board. This allows the hot air inside the electrical control cabinet to circulate to the outside. At the same time, when the electrical control cabinet is not in use, the control module can also control the drive component to rotate the gear back, which causes the switch board to seal the heat dissipation slot, reducing the chance of dust and foreign objects entering the cabinet.

[0015] Preferably, each of the switch panels is located on one side of the cabinet and has a connecting part extending into the cavity of the cabinet, and each connecting part is connected to the rack.

[0016] By adopting the above technical solution, the connection part is designed so that the rack and the switch plate are connected through the connection part, thereby leaving a certain distance between the switch plate body and the rack, which facilitates the sliding of the switch plate and effectively facilitates the driving of the sliding of the switch plate.

[0017] Preferably, an external DC power supply is also included, which is used to power the control board inside the frequency converter.

[0018] By adopting the above technical solution and setting the external DC power supply, the external DC power supply can directly power the inverter's control board, thereby reducing the probability of the inverter control board stopping operation when the main power supply of the electrical control cabinet fails, realizing fault isolation of the control board, and effectively ensuring the stable operation of the inverter.

[0019] Preferably, the frequency converter is controlled by the control module, which is used to control the frequency converter to restart after the main power supply is restored from a fault state to a normal state based on the data detected by the fault detection module.

[0020] By adopting the above technical solution and setting the inverter to restart, when the main power supply recovers from a fault state to a normal state, the control module can control the inverter to restart smoothly based on the data detected by the fault detection module, thereby enabling the main power supply to power the inverter again and effectively ensuring the power supply effect of the inverter.

[0021] Preferably, the system also includes a turbine detection module, which is used to detect the voltage and current signals of the motor in the heavy-duty gas turbine auxiliary module. The control module is used to control the frequency converter to adjust the magnetic flux and torque of the motor in the heavy-duty gas turbine auxiliary module in real time based on the data detected by the turbine detection module.

[0022] By adopting the above technical solution and configuring the turbine detection module, the turbine detection module can detect the voltage and current signals of the motor in the heavy-duty gas turbine auxiliary module. This allows the control module to calculate the estimated values ​​of magnetic flux and torque based on the detected signals, compare them with preset reference values, calculate the error, and adjust the control strategy according to the error. The control inverter is then used to adjust the magnetic flux and torque of the motor in the heavy-duty gas turbine auxiliary module in real time, thereby realizing DTC control of the motor in the heavy-duty gas turbine auxiliary module.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] The configuration of the uninterruptible power supply, fault detection module, control module, and power switching module enables the fault detection module to detect whether the main power supply has failed. This allows the control module to control the power switching module to switch the inverter from the main power supply output to the uninterruptible power supply output when the main power supply fails, so that the inverter can continue to work. This, in turn, ensures that the heavy-duty gas turbine auxiliary module can still work normally, effectively guaranteeing the working efficiency of the heavy-duty gas turbine auxiliary module.

[0025] The switch mechanism is designed so that the switch assembly can drive each switch plate to slide, thereby releasing the switch plate from the closed state of the heat dissipation slot. This allows the hot air inside the electrical control cabinet to circulate to the outside, thus achieving heat dissipation of the electrical control cabinet chamber and effectively reducing the probability of damage to electronic components inside the electrical control cabinet due to overheating.

[0026] The turbine detection module is configured to detect the voltage and current signals of the motors within the heavy-duty gas turbine auxiliary module. This allows the control module to calculate estimated flux and torque values ​​based on the detected signals, compare them with preset reference values, calculate the error, and adjust the control strategy accordingly. The frequency converter is then used to adjust the flux and torque of the motors within the heavy-duty gas turbine auxiliary module in real time, thereby achieving DTC control of the motors within the heavy-duty gas turbine auxiliary module. Attached Figure Description

[0027] Figure 1 This is a schematic diagram illustrating the overall structure of the AC control cabinet for the heavy-duty gas turbine auxiliary module in the embodiments of this application.

[0028] Figure 2 This is a structural block diagram of the electrical connection of the control module in an embodiment of this application.

[0029] Figure 3 This is a schematic diagram illustrating the structure of the switch assembly in the embodiments of this application.

[0030] Explanation of reference numerals in the attached diagram: 1. Cabinet; 11. Heat dissipation duct; 2. Frequency converter; 3. Main power supply; 4. Uninterruptible power supply; 5. Fault detection module; 6. Control module; 7. Power switching module; 8. Turbine detection module; 9. External DC power supply; 10. Switching mechanism; 101. Switching assembly; 1011. Drive component; 1012. Gear; 1013. Rack; 102. Switching board; 1021. Connecting part; 103. Temperature detection module. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0032] This application discloses an AC electrical control cabinet for a heavy-duty gas turbine auxiliary module. (Refer to...) Figure 1 and Figure 2 The AC control cabinet for the auxiliary module of a heavy-duty gas turbine includes a cabinet 1, a frequency converter 2, a main power supply 3, an uninterruptible power supply 4, a fault detection module 5, a control module 6, and a power switching module 7. The main power supply 3 supplies power to the frequency converter 2. The uninterruptible power supply 4 supplies power to the frequency converter 2. Both the fault detection module 5 and the power switching module 7 are controlled by the control module 6. The fault detection module 5 is used to detect whether a fault has occurred in the main power supply 3. Based on the data detected by the fault detection module 5, the control module 6 controls the power switching module 7 to switch the output of the frequency converter 2 from the main power supply 3 to the uninterruptible power supply 4.

[0033] Reference Figure 1 and Figure 2 The frequency converter 2 is fixedly installed inside the cabinet 1 by bolts. In this embodiment, the main power supply 3 is set to a 220V AC power supply, which is used to power the frequency converter 2. The uninterruptible power supply 4 is set to an AC 220V uninterruptible power supply 4, and is used to power the frequency converter 2 when the main power supply 3 fails.

[0034] Reference Figure 2 In this embodiment, the fault detection module 5 is configured as a voltage sensor and a current sensor, the control module 6 is configured as a PLC controller, and the power switching module 7 is configured as a relay. The voltage sensor, current sensor, relay and frequency converter 2 are all electrically connected to the PLC controller.

[0035] Reference Figure 1 and Figure 2 In this embodiment of the application, the cabinet 1 is also equipped with an AC220V / DC24V switching power supply. The switching power supply is used to convert the 220V AC power supplied by the main power supply 3 or the 220V AC power supplied by the uninterruptible power supply 4 into 24V DC power to power electronic devices such as PLC controllers.

[0036] Reference Figure 2 The voltage sensor is used to detect the voltage of the main power supply 3 and feeds the detected voltage back to the PLC controller. The current sensor is used to detect the current of the main power supply 3 and feeds the detected current back to the PLC controller. The PLC controller has pre-stored undervoltage and overcurrent thresholds. The PLC controller compares the detected voltage with the undervoltage threshold and the detected current with the overcurrent threshold.

[0037] Reference Figure 2 When the detected voltage is less than the undervoltage threshold or the detected current is greater than the overcurrent threshold, the PLC controller controls the relay to disconnect from the main power supply 3 and connect to the uninterruptible power supply 4, thereby switching the power supply from the main power supply 3 to the uninterruptible power supply 4.

[0038] Reference Figure 2 After the relay is connected to the uninterruptible power supply 4, when the detected voltage is greater than or equal to the undervoltage threshold, or the detected current is less than or equal to the overcurrent threshold, the PLC controller determines that the main power supply 3 has been restored. Subsequently, the PLC controller performs a delayed start on the relay to shield against temporary undervoltage and overcurrent faults caused by instability during the main power supply 3's recovery. Once the main power supply 3 stabilizes, the PLC controller then controls the relay to disconnect from the uninterruptible power supply 4 and reconnect to the main power supply 3, thus achieving the automatic restart function after the main power supply 3 is interrupted.

[0039] Reference Figure 2 In other embodiments, there are two frequency converters 2 and two uninterruptible power supplies 4, which are configured in a one-to-one correspondence. Each uninterruptible power supply 4 is used to supply power to the corresponding frequency converter 2, and the power switching module 7 is used to switch each uninterruptible power supply 4, so that each frequency converter 2 can maintain its working state after the main power supply 3 fails.

[0040] Reference Figure 2 The AC control cabinet for the heavy-duty gas turbine auxiliary module also includes a turbine detection module 8. In this embodiment, the turbine detection module 8 comprises a voltage sensor and a current sensor. The voltage sensor is used to detect the voltage of the motor within the heavy-duty gas turbine auxiliary module and feeds the detected voltage back to the PLC controller. The current sensor is used to detect the current of the motor within the heavy-duty gas turbine auxiliary module and feeds the detected current back to the PLC controller.

[0041] Reference Figure 2The PLC controller receives the detected voltage and current values ​​and calculates estimated values ​​of the magnetic flux and torque of the motor in the heavy-duty gas turbine auxiliary module based on the voltage and current data. The PLC controller also stores reference values ​​for magnetic flux and torque in advance. It then subtracts the calculated estimated values ​​from the reference values, using the absolute value of the difference as the error value.

[0042] Reference Figure 2 The PLC controller also stores allowable values ​​in advance, and uses the PLC controller to compare the error value with the allowable value. When the error value is greater than the allowable value, the PLC controller adjusts the output of the frequency converter 2 to reduce the error value, thereby changing the torque and magnetic flux of the motor, realizing precise control of the motor torque and magnetic flux, and thus realizing DTC control of the motor in the heavy-duty gas turbine auxiliary module.

[0043] Reference Figure 2 The heavy-duty gas turbine auxiliary module AC control cabinet also includes an external DC power supply 9. In this embodiment, the external DC power supply 9 is set as an external DC 24V power supply. This DC 24V power supply is used to independently power the control board inside the inverter 2, as well as the sensors and actuators outside the cabinet 1, so as to achieve physical and electrical isolation of the power system, ensure the normal operation of the control board inside the inverter 2, and enable the power supply inside the control cabinet to continue to operate normally when the external sensors or actuators experience short circuits or other faults.

[0044] Reference Figure 1 and Figure 3 The cabinet 1 has several heat dissipation slots 11 on its two side walls along its width direction, and each heat dissipation slot 11 communicates with a cavity inside the cabinet 1. The cabinet 1 is also equipped with a switching mechanism 10, which includes a switching assembly 101 and several switch plates 102. In this embodiment, the number of switching assemblies 101 is set to two, and they are respectively located on both sides of the cabinet 1 along its width direction. The switch plates 102 are set to two groups, with the two groups of switch plates 102 respectively located on both sides of the cabinet 1 along its width direction, so that the switch plates 102 in each group correspond one-to-one with the heat dissipation slots 11 on the corresponding side of the cabinet 1.

[0045] Reference Figure 1 and Figure 3Each switch plate 102 is located within a corresponding heat dissipation groove 11. Each switch plate 102 has a connecting portion 1021 extending from the top of its side facing the cabinet 1 cavity into the cabinet 1 cavity. The connecting portion 1021 is integrally formed with the switch plate 102. One end of each connecting portion 1021 protrudes through the inner wall of the cabinet 1 and reaches into the cabinet 1 cavity. The top of each switch plate 102 is located directly above the corresponding heat dissipation groove 11 and extends into the cabinet 1, slidingly connected to the cabinet 1 in the direction of the cabinet 1's height. The bottom of each switch plate 102 abuts against the inner bottom wall of the corresponding heat dissipation groove 11 to seal the heat dissipation groove 11.

[0046] Reference Figure 1 and Figure 3 Each switch assembly 101 includes a drive element 1011, a gear 1012 and a rack 1013. In this embodiment, each drive element 1011 is configured as a servo motor. The servo motor is fixedly installed in the cabinet 1 by bolts, and the extension direction of the output shaft is the width direction of the cabinet 1.

[0047] Reference Figure 1 and Figure 3 Each gear 1012 is fixedly mounted on the output shaft of the corresponding servo motor, so that the servo motor drives the gear 1012 to rotate. Each gear 1012 meshes with a corresponding rack 1013, and each rack 1013 is slidably connected to the inner wall of the cabinet 1, with the sliding direction being the height direction of the cabinet 1. Each rack 1013 is fixedly connected to the connecting part 1021 of each switch plate 102 on the corresponding side of the cabinet 1, so that the rack 1013 can drive each corresponding switch plate 102 to slide.

[0048] Reference Figure 1 , Figure 2 and Figure 3 The switching mechanism 10 also includes a temperature detection module 103. In this embodiment, the temperature detection module 103 is configured as a temperature sensor, which is electrically connected to the PLC controller along with the aforementioned servo motor (i.e., drive unit 1011). The temperature sensor is fixedly installed inside the cabinet 1 and is used to detect the temperature inside the cabinet 1 cavity, and to feed back the detected temperature to the aforementioned PLC controller.

[0049] Reference Figure 1 , Figure 2 and Figure 3The PLC controller is used to receive the temperature value detected by the temperature detection module 103. The PLC controller also stores a preset temperature value. The PLC controller compares the detected temperature value with the preset temperature value. When the detected temperature value is greater than the preset temperature value, it controls the servo motor to start, so that the servo motor drives the gear 1012 to rotate. Through the rack 1013, it drives each switch plate 102 to slide, so that each heat sink 11 opens and increases the heat dissipation effect.

[0050] The implementation principle of the AC control cabinet for a heavy-duty gas turbine auxiliary module in this application embodiment is as follows: During use, the fault detection module 5 can detect whether the main power supply 3 has failed, so that when the main power supply 3 fails, the control module 6 can control the power switching module 7 to switch the inverter 2 from the output of the main power supply 3 to the output of the uninterruptible power supply 4, so that the inverter 2 can continue to work, thereby enabling the heavy-duty gas turbine auxiliary module to still work normally, effectively ensuring the working efficiency of the heavy-duty gas turbine auxiliary module.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A heavy-duty gas turbine auxiliary module AC electrical control cabinet, comprising a cabinet body (1), a frequency converter (2) and a main power supply (3), the main power supply (3) is used for supplying power to the frequency converter (2), characterized in that: The uninterruptible power supply (4) is used for supplying power to the frequency converter (2), the fault detection module (5) and the power switching module (7) are controlled by the control module (6), the fault detection module (5) is used for detecting whether the main power supply (3) fails, and the control module (6) is used for controlling the power switching module (7) to switch the frequency converter (2) from the output of the main power supply (3) to the output of the uninterruptible power supply (4) when the fault detection module (5) detects that the main power supply (3) fails.

2. An AC electrical control cabinet for a heavy-duty gas turbine auxiliary module according to claim 1, characterized in that: A plurality of heat dissipation grooves (11) are formed in the side wall of the cabinet body (1), and a switch mechanism (10) is further arranged on the cabinet body (1), the switch mechanism (10) comprises a switch assembly (101) and a plurality of switch plates (102), the switch plates (102) correspond to the heat dissipation grooves (11) and are used for closing the corresponding heat dissipation grooves (11), and the switch plates (102) are slidably connected to the cabinet body (1), and the switch assembly (101) is used for driving each corresponding switch plate (102) to slide.

3. A heavy-duty gas turbine auxiliary module AC electrical control cabinet according to claim 2, characterized in that: The switch assembly (101) comprises a driving member (1011), a gear (1012) and a rack (1013), the rack (1013) is slidably connected to the cabinet body (1) and has the same sliding direction as the switch plates (102), the rack (1013) is connected to each switch plate (102), the gear (1012) is rotatably connected to the cabinet body (1), the driving member (1011) is used for driving the gear (1012) to rotate, and the gear (1012) is engaged with the rack (1013).

4. A heavy-duty gas turbine auxiliary module AC electrical control cabinet according to claim 3, characterized in that: A temperature detection module (103) is further arranged, the temperature detection module (103) is used for detecting the temperature of the inner cavity of the cabinet body (1), and the control module (6) is used for controlling the opening and closing of the driving member (1011) based on the data detected by the temperature detection module (103).

5. A heavy-duty gas turbine auxiliary module AC electrical control cabinet according to claim 3, characterized in that: Each switch plate (102) is located on one side of the cabinet body (1) and extends into the cavity of the cabinet body (1) through a connecting portion (1021), and each connecting portion (1021) is connected to the rack (1013).

6. A heavy duty gas turbine auxiliary module AC electrical control cabinet according to claim 1, characterized in that: An external DC power supply (9) is further arranged, and the external DC power supply (9) is used for supplying power to the control board in the frequency converter (2).

7. A heavy duty gas turbine auxiliary module AC electrical control cabinet according to claim 1, characterized in that: The frequency converter (2) is controlled by the control module (6), and the control module (6) is used for controlling the frequency converter (2) to restart after the main power supply (3) recovers from the fault state to the normal state based on the data detected by the fault detection module (5).

8. A heavy duty gas turbine auxiliary module AC electrical control cabinet according to claim 1, characterized in that: A turbine detection module (8) is further arranged, the turbine detection module (8) is used for detecting the voltage and current signals of the motor in the heavy gas turbine auxiliary module, and the control module (6) is used for controlling the frequency converter (2) to adjust the magnetic flux and torque of the motor in the heavy gas turbine auxiliary module in real time based on the data detected by the turbine detection module (8).

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