Driving system of GIS and GIS

Abstract

The invention relates to a GIS driving system and a GIS, and belongs to the field of gas insulated switchgear design. The two motors are respectively connected with the three-position switch and the vacuum circuit breaker, the two motors are also respectively connected with the corresponding motor driving modules, and the corresponding PWM signals are sent to the corresponding motor driving modules through the driving controller, so that the corresponding motors rotate forwards or backwards, and therefore, the working efficiency is improved, and the working efficiency is improved. Therefore, switching among different stations of the three-station switch and opening and closing of the circuit breaker are realized.

Description

Technical Field

[0001] The invention relates to a GIS drive system and the GIS, and belongs to the field of gas insulated switchgear design. Background Art

[0002] GIS (Gas Insulated Switchgear) is an important component of the power system. In GIS products, circuit breakers are usually used in conjunction with three-position switches to achieve more reliable control and protection.

[0003] The operating mechanisms of traditional GIS products mainly include electromagnetic operating mechanisms, spring operating mechanisms, pneumatic operating mechanisms and hydraulic operating mechanisms. Although these types of operating mechanisms can meet the opening and closing operations of GIS products within a certain period of time, in some scenarios where faster response time is required, traditional operating mechanisms have gradually failed to meet the requirements.

[0004] The Chinese patent application publication with application publication number CN114420512A discloses a motor-driven high-voltage circuit breaker and its driving system. In this solution, there are at least two motors, at least one motor is used for opening the circuit breaker, and at least one motor is used for closing the circuit breaker. However, one motor in this solution can only realize one function, which causes a waste of resources and increases costs. Summary of the invention

[0005] The object of the present invention is to provide a GIS drive system and a GIS, so as to solve the problem in the prior art that when a motor is used for opening / closing operation, the motor has a single function and leads to high cost.

[0006] To achieve the above object, the solution of the present invention includes: A GIS drive system of the present invention comprises a drive controller and two-way motor drive modules, and drive motors corresponding to the motor drive modules one by one; the drive controller is respectively connected to the motor drive modules, the power input port of the motor drive module is connected to the energy storage unit, the power output port of the motor drive module is connected to the drive motor, and the two drive motors are respectively driven to connect the moving contact of the circuit breaker and the moving contact of the three-position switch; the drive controller sends a corresponding PWM signal to the corresponding motor drive module according to the corresponding opening / closing signal received, the motor drive module controls the drive motor to rotate accordingly according to the PWM signal, and the forward rotation and reverse rotation of the drive motor respectively correspond to realize the opening and closing of the circuit breaker and the switching between different positions of the three-position switch.

[0007] Furthermore, the drive controller also collects the drive motor resolver signal, and feeds back the status of different positions of the three-position switch and the open / closed status of the circuit breaker according to the drive motor resolver signal.

[0008] Furthermore, the drive controller also collects a current transformer signal between the motor drive module and the drive motor, and generates a corresponding PWM signal according to the current transformer signal. The motor drive module adjusts the speed of the drive motor according to the PWM signal.

[0009] Furthermore, the energy storage unit is a super capacitor, and two ends of the super capacitor are correspondingly connected to two ends of a charging unit for converting alternating current into direct current.

[0010] A GIS comprises a circuit breaker body, a three-position switch body, a drive controller and two motor drive modules, and drive motors corresponding to the motor drive modules one by one; the drive controller is respectively connected to the motor drive modules, the power input port of the motor drive module is connected to an energy storage unit, the power output port of the motor drive module is connected to the drive motor, and the two drive motors are respectively driven to connect a moving contact of the circuit breaker and a moving contact of the three-position switch; the drive controller sends a corresponding PWM signal to the corresponding motor drive module according to a corresponding opening / closing command, the motor drive module controls the drive motor to rotate accordingly according to the PWM signal, and the forward rotation and reverse rotation of the drive motor respectively correspond to realize the opening and closing of the circuit breaker and the switching between different positions of the three-position switch.

[0011] Furthermore, the drive controller also collects the drive motor resolver signal, and feeds back the status of different positions of the three-position switch and the open / closed status of the circuit breaker according to the drive motor resolver signal.

[0012] Furthermore, the drive controller also collects a current transformer signal between the motor drive module and the drive motor, and generates a corresponding PWM signal according to the current transformer signal. The motor drive module adjusts the speed of the drive motor according to the PWM signal.

[0013] Furthermore, the energy storage unit is a super capacitor, and two ends of the super capacitor are correspondingly connected to two ends of a charging unit for converting alternating current into direct current.

[0014] The beneficial effects of the present invention are as follows: the present invention is an improved invention, which uses two motors to be connected to a three-position switch and a vacuum circuit breaker respectively, and the two motors are also connected to corresponding motor drive modules respectively, and a corresponding PWM signal is sent to the corresponding motor drive module through a drive controller to make the corresponding motor rotate forward or reverse, thereby realizing switching between different positions of the three-position switch and opening and closing of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a drive system architecture of the present invention; Figure 2 It is a schematic diagram of the appearance of a GIS of the present invention; Figure 3 It is a schematic diagram of the main wiring of a GIS of the present invention; Figure 4 It is a main view of a GIS of the present invention; Figure 5 It is a right view of a GIS of the present invention.

[0016] In the figure: 1. crank box; 2. spindle crank; 3. arc connecting rod; 4. insulating pull rod; 5. compression spring; 6. bellows; 7. moving contact of arc extinguishing chamber; 8. DSP digital controller; 9. servo motor M2; 10. rotating shaft; 11. three-phase support frame of circuit breaker; 12. controller cabinet; 13. three-position switch at the static end of vacuum circuit breaker; 14. three-position switch at the moving end of vacuum circuit breaker; 15. first motor drive controller; 16. current transformer; 17. vacuum circuit breaker. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0018] The idea of ​​the present invention is that two motors are respectively connected to the three-position switch and the circuit breaker, and the corresponding digital signal controller outputs signals to drive the motors to rotate forward and reverse, thereby realizing the corresponding opening / closing operations of the three-position switch and the circuit breaker.

[0019] System Example: This embodiment provides a GIS drive system, the overall architecture of which is as follows: Figure 1 As shown, it includes a three-position switch body, a vacuum circuit breaker body, an energy storage unit (supercapacitor C), a charging unit for providing DC power to the energy storage unit, two motor drive modules (the first motor drive controller and the second motor drive controller), two servo motors (M1, M2) and a drive controller. Among them, the drive controller includes a DSP (digital signal processor) and a CPLD drive controller; the charging unit is used to convert the AC power emitted by the AC circuit into DC power; the motor drive module includes a PWM drive module (PWM drive module 1 and PWM drive module 2) and an inverter circuit using an IGBT switch tube; both servo motors can use three-phase permanent magnet synchronous motors. In order to save costs, the servo motor M1 uses an ordinary servo motor plus a worm gear reducer to replace the three-phase permanent magnet synchronous motor. In order to meet the vacuum circuit breaker opening / closing time and operating power, the servo motor must learn from today's advanced permanent magnet materials and resolver controllers, and specially manufacture a servo motor that meets the characteristics of the vacuum circuit breaker, so that its rotational inertia is small and the rotation angle of the shaft does not exceed 180°.

[0020] One end of the servo motor M1 is connected to the moving contact of the three-position switch, and the other end is connected to the power output end of the inverter circuit 1; one end of the servo motor M2 is connected to the moving contact of the vacuum circuit breaker, and the other end is connected to the power output end of the inverter circuit 2. The power input end of each inverter circuit is connected to a super capacitor C, and the anode and cathode of the super capacitor C are respectively connected to the positive and negative electrodes of the charging unit; the single-chip microcomputer controller is connected to the DSP+CPLD drive controller through dual-channel optical fiber communication, the DSP+CPLD drive controller is connected to the PWM drive module 1 and the PWM drive module 2, and the PWM drive module 1 and the PWM drive module 2 are connected to the inverter circuit 1 and the inverter circuit 2 respectively.

[0021] When the single-chip microcomputer controller receives the circuit breaker opening / closing command, it sends the corresponding opening / closing signal to the DSP+CPLD drive controller according to the corresponding command. The DSP+CPLD drive controller sends the corresponding PWM signal to the PWM drive module 2 according to the corresponding command. The PWM drive module 2 outputs the corresponding gate signal according to the corresponding PWM control signal to control the on and off of each IGBT in the inverter circuit 2. The inverter circuit 2 outputs the corresponding current to the servo motor M2 to control the opening / closing operation of the vacuum circuit breaker. The forward current realizes the forward rotation of the servo motor M2, and the reverse current realizes the reverse rotation of the servo motor M2. The forward rotation of the servo motor M2 realizes the opening operation, and the reverse rotation realizes the closing operation.

[0022] When the single-chip microcomputer controller receives the opening / closing command of the three-position switch, it sends the corresponding opening / closing signal to the DSP+CPLD drive controller according to the corresponding command. The DSP+CPLD drive controller sends the corresponding PWM signal to the PWM drive module 1 according to the corresponding command. The PWM drive module 1 outputs the corresponding gate signal according to the corresponding PWM control signal to control the on and off of each IGBT in the inverter circuit 1. The inverter circuit 1 outputs the corresponding current to the servo motor M1 to control the switching between different positions of the three-position switch, that is, to realize the three working conditions of isolation, middle and grounding. The forward current realizes the forward rotation of the servo motor M1, and the reverse current realizes the reverse rotation of the servo motor M1. The forward rotation of the servo motor M1 realizes the opening operation, and the reverse rotation realizes the closing operation.

[0023] The DSP+CPLD driver controller collects the resolver signals of the servo motors M1 and M2, and feeds back the status of the three-position switch between different positions and the opening / closing status of the vacuum circuit breaker to the single-chip controller; the single-chip decides whether to send the corresponding opening / closing signal to the DSP+CPLD driver controller based on the received status. For example, if the circuit breaker has been opened and it has fed back to the single-chip controller that it is in the opening state at this time, if the single-chip controller still receives the opening command of the circuit breaker at this time, the single-chip controller will not send the circuit breaker opening signal to the DSP+CPLD driver controller.

[0024] The DSP+CPLD drive controller also collects the current transformer signal between the inverter circuit 1 and the servo motor M1 and the current transformer signal between the inverter circuit 2 and the servo motor M2, determines the opening / closing speed under the corresponding parameters, and obtains the PWM signal of the required speed of the corresponding servo motor through the DSP digital processor, thereby realizing the intelligent control of the vacuum circuit breaker and the three-position switch.

[0025] This embodiment also provides a GIS applicable to the drive system, such as Figure 2 As shown, it includes a controller cabinet 12, a three-position switch 13 at the static end of the vacuum circuit breaker, a three-position switch 14 at the dynamic end of the vacuum circuit breaker, a first motor drive controller 15, a current transformer 16 and a vacuum circuit breaker 17; wherein the controller cabinet 12 is provided with a single-chip microcomputer controller and a DSP+CPLD drive controller. Its internal wiring is as follows Figure 3 As shown, QS2 is the moving contact of the three-position switch 14 at the moving end of the vacuum circuit breaker; QS1 is the moving contact of the three-position switch 13 at the static end of the vacuum circuit breaker; QF is the moving contact of the vacuum circuit breaker 17; TA1 / P1 and TA2 / P2 are current transformers.

[0026] The drive system provided by the present invention is applicable to most motor-driven GIS (one vacuum circuit breaker) on the market, but in the GIS provided above, there are two vacuum circuit breakers due to special requirements. For this special GIS, the operating mechanism of one vacuum circuit breaker is a motor, and the other vacuum circuit breaker is a traditional operating mechanism (for example, a spring operating mechanism, a pneumatic operating mechanism).

[0027] Combine the following Figure 4 , Figure 5 The linkage relationship between the various components in GIS is explained by using the single-chip microcomputer controller receiving the vacuum circuit breaker opening command. Figure 4 This is a sectional front view of the vacuum circuit breaker 17 near the moving end. Figure 5 This is a right side view of the section view near the moving end of the vacuum circuit breaker 17: When the single-chip microcomputer controller receives the circuit breaker opening command, it sends the circuit breaker opening command to the DSP+CPLD drive controller. The DSP digital controller 8 performs corresponding modulation with the CPLD drive controller and sends the corresponding PWM signal to the PWM drive module 2. The PWM drive module 2 generates a gate signal according to the PWM signal to make the inverter circuit 2 generate a forward current of corresponding magnitude. The servo motor M29 drives the shaft 10 to rotate forward according to the forward current, thereby driving the arc connecting rod 3 connected to the main shaft crank arm 2 in the crank arm box 1, and then drives the insulating pull rod 4, and finally realizes the opening operation of the moving and static contacts of the arc extinguishing chamber. In the process of opening, in order to increase the opening time, the control system accelerates the moving contact 7 of the vacuum arc extinguishing chamber. At the end of the opening, the control system applies a corresponding torque to decelerate its movement, thereby driving the vacuum arc extinguishing chamber to descend smoothly and avoiding overspeed collision of the transmission system. Among them, the function of the compression spring 5 is to absorb part of the vibration during the opening and closing process, reduce the noise and vibration generated by the motor, and ensure the stable operation of the GIS; the function of the bellows 6 is to absorb a certain foundation settlement and mechanical vibration, and reduce equipment failures caused by environmental factors; the circuit breaker three-phase support frame 11 is used to fix and support the circuit breaker, ensure its stable position in the GIS, and prevent displacement due to vibration or external force.

[0028] GIS Example: This embodiment provides a GIS. The modules and components included in the GIS and the connection relationships between them have been introduced in the system embodiment, so they will not be repeated here.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A GIS driving system, characterized in that: It comprises a drive controller and two motor drive modules, and drive motors corresponding to the motor drive modules one by one; the drive controller is respectively connected to the motor drive modules, the power input port of the motor drive module is connected to the energy storage unit, the power output port of the motor drive module is connected to the drive motor, and the two drive motors are respectively connected to the moving contact of the circuit breaker and the moving contact of the three-position switch; the drive controller sends a corresponding PWM signal to the corresponding motor drive module according to the corresponding opening / closing signal received, and the motor drive module controls the drive motor to rotate accordingly according to the PWM signal, and the forward and reverse rotation of the drive motor respectively corresponds to realizing the opening and closing of the circuit breaker and the switching between different positions of the three-position switch.

2. The GIS driving system according to claim 1, characterized in that: The drive controller also collects the drive motor resolver signal, and feeds back the status of different positions of the three-position switch and the opening / closing status of the circuit breaker according to the drive motor resolver signal.

3. The GIS driving system according to claim 1, characterized in that: The drive controller also collects a current transformer signal between the motor drive module and the drive motor, and generates a corresponding PWM signal according to the current transformer signal. The motor drive module adjusts the speed of the drive motor according to the PWM signal.

4. The GIS driving system according to claim 1, characterized in that: The energy storage unit is a super capacitor, and two ends of the super capacitor are correspondingly connected to two ends of a charging unit for converting alternating current into direct current.

5. A GIS, characterized in that: It comprises a circuit breaker body, a three-position switch body, a drive controller and two motor drive modules, and drive motors corresponding to the motor drive modules one by one; the drive controller is respectively connected to the motor drive modules, the power input port of the motor drive module is connected to the energy storage unit, the power output port of the motor drive module is connected to the drive motor, and the two drive motors are respectively connected to the moving contact of the circuit breaker and the moving contact of the three-position switch; the drive controller sends a corresponding PWM signal to the corresponding motor drive module according to the corresponding opening / closing command, and the motor drive module controls the drive motor to rotate accordingly according to the PWM signal, and the forward and reverse rotation of the drive motor respectively corresponds to realizing the opening and closing of the circuit breaker and the switching between different positions of the three-position switch.

6. The GIS according to claim 5, characterized in that: The drive controller also collects the drive motor resolver signal, and feeds back the status of different positions of the three-position switch and the opening / closing status of the circuit breaker according to the drive motor resolver signal.

7. The GIS according to claim 5, characterized in that: The drive controller also collects a current transformer signal between the motor drive module and the drive motor, and generates a corresponding PWM signal according to the current transformer signal. The motor drive module adjusts the speed of the drive motor according to the PWM signal.

8. The GIS according to claim 5, characterized in that: The energy storage unit is a super capacitor, and two ends of the super capacitor are correspondingly connected to two ends of a charging unit for converting alternating current into direct current.

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