Nuclear power plant emergency diesel generator simulation device

Abstract

The application discloses a nuclear power plant emergency diesel generator simulation device, which comprises a mounting base plate and two groups of motor assemblies arranged on the mounting base plate. Each group of motor assemblies comprises a variable frequency motor mounted on the mounting base plate, a speed measuring assembly connected with an output shaft of the variable frequency motor, a parallel operation gear box connected with the speed measuring assembly, a right-angle gear box connected with the parallel operation gear box, a speed regulating actuator connected with the right-angle gear box, and an angle encoder connected with the speed regulating actuator and used for detecting the rotation angle of an output shaft of the speed regulating actuator. The speed regulator to be tested is in communication connection with the speed measuring assembly and the speed regulating actuator, and the two parallel operation gear boxes are connected through a shaft coupling. The nuclear power plant emergency diesel generator simulation device is provided with two groups of motor assemblies, the output shafts of the two variable frequency motors of the two groups of motor assemblies are connected through the parallel operation gear boxes and the shaft coupling, and the simulation verification of a two-drag-one diesel generator set can be effectively completed.

Description

Technical Field

[0001] This invention belongs to the field of nuclear power technology, and more specifically, this invention relates to a simulation device for an emergency diesel generator in a nuclear power plant. Background Technology

[0002] With the continuous development of the social economy, the demand for electricity has also risen rapidly. As an important clean energy source, and with the continuous advancement of nuclear power technology, the proportion of nuclear power generation in total electricity generation has steadily increased in recent years.

[0003] Given the unique nature of nuclear power facilities, ensuring the safe operation of nuclear power plants is always a top priority in practical applications. To guarantee safe operation, nuclear power plants are typically equipped with emergency diesel generator sets. When both the main power supply and auxiliary power supply of the nuclear power plant fail, the emergency diesel generator sets can ensure the safe shutdown of the nuclear power unit and prevent damage to critical equipment. Therefore, they play a crucial role in protecting fuel cells from damage and ensuring nuclear safety.

[0004] The speed governor of a nuclear power emergency diesel generator is used to control the speed of the emergency diesel generator, ensuring the safe and stable operation of the emergency diesel generator set. Therefore, during the research and development process of the nuclear power emergency diesel generator speed governor, it is necessary to continuously test it to verify whether the speed governor meets the requirements and ensure the safe operation of the nuclear power plant.

[0005] In related technologies, the nuclear power plant emergency diesel generator simulation device only has one variable frequency motor, which can only perform speed governor performance testing and verification for conventional diesel generator sets with one engine driving one generator, and cannot meet the performance testing and verification of the speed governor for two-to-one diesel generator sets. Summary of the Invention

[0006] The purpose of this invention is to overcome at least one defect of the prior art and provide a simulation device for an emergency diesel generator in a nuclear power plant.

[0007] To achieve the above-mentioned objectives, the present invention provides a nuclear power plant emergency diesel generator simulation device, comprising:

[0008] Install base plate; and

[0009] Two sets of motor assemblies are mounted on the mounting base plate. Each set of motor assemblies includes a variable frequency motor mounted on the mounting base plate, a speed measuring component connected to the output shaft of the variable frequency motor, a parallel gearbox connected to the speed measuring component, a right-angle gearbox connected to the parallel gearbox, a speed regulating actuator connected to the right-angle gearbox, and an angle encoder connected to the speed regulating actuator for detecting the rotation angle of the output shaft of the speed regulating actuator. The speed regulator to be tested is communicatively connected to the speed measuring component and the speed regulating actuator. The two parallel gearboxes are connected by a coupling.

[0010] According to one embodiment of the nuclear power plant emergency diesel generator simulation device of the present invention, the speed measuring component includes a speed measuring gear and a speed measuring sensor. The speed measuring gear is fixedly connected to the output shaft of the variable frequency motor, and the speed measuring sensor is used to measure the rotational speed of the speed measuring gear.

[0011] According to one embodiment of the nuclear power plant emergency diesel generator simulation device of the present invention, the input end of the right-angle gearbox is connected to the output shaft of the parallel gearbox, and the output end is connected to the drive shaft of the speed regulating actuator.

[0012] According to one embodiment of the nuclear power plant emergency diesel generator simulation device of the present invention, the two variable frequency motors, two speed measuring components, two parallel gearboxes, and the coupling connecting the two parallel gearboxes of the two sets of motor assemblies are arranged in a U-shape on the mounting base plate.

[0013] According to one embodiment of the nuclear power plant emergency diesel generator simulation device of the present invention, after the speed governor receives the signal from the speed measuring component, it sends a control signal to the speed regulating actuator. The output shaft of the speed regulating actuator rotates according to the control signal. The angle encoder measures the rotation angle of the output shaft of the speed regulating actuator. The real-time simulation diesel engine control system collects the rotation angle of the output shaft of the speed regulating actuator.

[0014] According to one embodiment of the nuclear power plant emergency diesel generator simulation device of the present invention, the simulation device further includes a simulator electrically connected to the variable frequency motor and the angle encoder, the simulator containing a real-time simulation model of the diesel generator.

[0015] According to one embodiment of the nuclear power plant emergency diesel generator simulation device of the present invention, the simulation device further includes a host computer, the host computer running management software and communicating with the simulator.

[0016] According to one embodiment of the nuclear power plant emergency diesel generator simulation device of the present invention, the speed governor outputs an analog signal to control the speed governor actuator, the output shaft position of the speed governor actuator is obtained through the angle encoder, the simulator collects the encoder signal and converts the encoder signal into throttle opening and fuel injection quantity, and transmits the signal to the real-time simulation model of the diesel engine through the host computer.

[0017] Compared to existing technologies, the nuclear power plant emergency diesel generator simulation device of this invention has two sets of motor assemblies. The output shafts of the two variable frequency motors in the two sets of motor assemblies are connected through a parallel gearbox and a coupling. The two variable frequency motors can work simultaneously to effectively simulate and verify a two-to-one diesel generator set. When the variable frequency motor in one set of motor assemblies fails, the variable frequency motor in the other set of motor assemblies can not only operate normally, but also drive the right-angle gearbox and speed control actuator in the other set of motor assemblies through the transmission of the parallel gearbox and coupling, thereby improving the overall stability of the equipment. Attached Figure Description

[0018] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, illustrates the nuclear power plant emergency diesel generator simulation device of the present invention and its technical effects, wherein:

[0019] Figure 1 This is a schematic diagram of the actuator of the nuclear power plant emergency diesel generator simulation device of the present invention.

[0020] Figure 2 This is a schematic diagram of the control mechanism of the nuclear power plant emergency diesel generator simulation device of the present invention.

[0021] In the picture:

[0022] 10--Nuclear Power Plant Emergency Diesel Generator Simulation Device

[0023] 100--Mounting base plate; 102--Variable frequency motor; 104--Speed ​​measuring gear; 106--Bracket; 108--Speed ​​sensor; 110--Coupling; 112--Parallel gearbox; 114--Support frame; 116--Right angle gearbox; 118--Speed ​​regulating actuator; 120--Frame; 122--Protective plate; 124--Lifting ring; 126--Top cover; 128--Viewing window;

[0024] 20--Control mechanism of nuclear power plant emergency diesel generator simulation device

[0025] 200--Protective frame; 202--Protective cover; 204--Flip cover; 206--Speed ​​controller; 208--Switch. Detailed Implementation

[0026] To make the objectives, technical solutions, and effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described in this specification are merely for explaining the invention and are not intended to limit the invention.

[0027] Please refer to Figure 1 As shown, the nuclear power plant emergency diesel generator simulation device 10 of the present invention includes:

[0028] Mounting base plate 100; and

[0029] Two sets of motor assemblies are mounted on the mounting base plate 100. Each set of motor assemblies includes a variable frequency motor 102 mounted on the mounting base plate 100, a speed measuring component connected to the output shaft of the variable frequency motor 102, a parallel gearbox 112 connected to the speed measuring component, a right-angle gearbox 116 connected to the parallel gearbox 112, a speed regulating actuator 118 connected to the right-angle gearbox 116, and an angle encoder (not shown). The angle encoder is connected to the speed regulating actuator 118 and is used to detect the rotation angle of the output shaft of the speed regulating actuator 118. The speed regulator to be tested is communicatively connected to the speed measuring component and the speed regulating actuator 118. The two parallel gearboxes 112 are connected by a coupling 110.

[0030] exist Figure 1 In the embodiment shown, two variable frequency motors 102 are arranged side by side. The two variable frequency motors 102, two speed measuring components, two parallel gearboxes 112, and the couplings 110 connecting the two parallel gearboxes 112 are arranged in a U-shape on the mounting base plate 100. This arrangement can save the space occupied by the entire actuator 10.

[0031] The speed measuring component is used to detect the rotational speed of the output shaft of the variable frequency motor 102, simulating the output speed of a diesel engine. The speed measuring component includes a speed measuring gear 104 and a speed measuring sensor 108. The speed measuring gear 104 is fixedly connected to the output shaft of the variable frequency motor 102. A bracket 106 is provided on the mounting base plate 100 on one side of the speed measuring gear 104. The speed measuring sensor 108 is correspondingly set on the bracket 106 and faces the speed measuring gear 104 to detect and record the rotational speed of the speed measuring gear 104 in real time.

[0032] The speed controller 118 is connected to an angle encoder (not shown) to detect the rotation angle of the output shaft of the speed controller 118. The speed controller under test is communicatively connected to the speed measuring component and the speed controller 118. After receiving the signal from the speed measuring component, the speed controller sends a control signal to the speed controller 118. The output shaft of the speed controller 118 rotates according to the control signal. The angle encoder measures the rotation angle of the output shaft of the speed controller 118 to simulate the rotation angle of the output shaft of the diesel engine control system in real time.

[0033] exist Figure 1 In the illustrated embodiment, the parallel gearbox 112 and the speed measuring gear 104 are connected by a coupling 110, and the parallel gearbox 112 is connected to the right-angle gearbox 116 by a coupling 110. The two parallel gearboxes 112 are also connected to each other by a coupling 110. The coupling 110 overcomes axial installation tolerances, ensuring stable transmission of the output shaft of the variable frequency motor 102. The couplings 110 have essentially the same structure, differing only in specific dimensions due to the different sizes of the connected shafts.

[0034] According to one embodiment of the nuclear power plant emergency diesel generator simulation device of the present invention, a support frame 114 is provided on the mounting base plate 100, and a right-angle gearbox 116 is fixed on the support frame 114. The input end of the right-angle gearbox 116 is connected to the output shaft of the parallel gearbox 112, and the output end is connected to the drive shaft of the speed regulator 118, thus converting horizontal rotation into vertical rotation. With this configuration, the variable frequency motor 102 drives the drive shaft of the speed regulator 118 to rotate through the parallel gearbox 112, coupling 110, and right-angle gearbox 116 to establish the oil pressure of the speed regulator 118 and simulate the operation of a diesel engine.

[0035] Please continue to refer to Figure 1 As shown, a frame 120 and a protective plate 122 (e.g., a sheet metal plate) are provided around the mounting base 100. A rotatable top cover 126 is provided on the top of the frame 120. The mounting base 100, frame 120, protective plate 122, and top cover 126 together form a protective space, providing effective protection for the various devices within. The protective plate 122 can slide relative to the frame 120 to enter the protective space from the side of the actuator 10.

[0036] exist Figure 1 In the illustrated embodiment, the mounting base 100 is fixedly mounted on the frame 120 and suspended relative to the ground. Heat dissipation holes can be provided in the mounting base 100 as needed to dissipate the heat generated during the operation of the variable frequency motor 102. For ease of handling and lifting, the top of the frame 120 is equipped with lifting rings 124, and the bottom of the frame 120 is equipped with rollers for position adjustment. Adjustable fixing feet are used to position the actuator 10 as a whole.

[0037] According to one embodiment of the nuclear power plant emergency diesel generator simulation device of the present invention, a viewing window 128 is provided on the top cover 126. During operation, when the top cover 126 is closed, the operation of the internal equipment can be observed through the viewing window 128 on the top cover 126. Figure 1 In the embodiment shown, four viewing windows 128 are evenly arranged on the top cover 126.

[0038] As can be seen from the above detailed description of the embodiments of the present invention, compared with the prior art, the nuclear power plant emergency diesel generator simulation device of the present invention is provided with two sets of motor assemblies. The output shafts of the two variable frequency motors 102 of the two sets of motor assemblies are connected through a parallel gearbox 112 and a coupling 110. The two variable frequency motors 102 can work simultaneously to effectively simulate and test the performance of the speed governor of the two-to-one diesel generator set. When the variable frequency motor 102 of one set of motor assemblies fails, the variable frequency motor 102 of the other set of motor assemblies can not only operate normally, but also drive the right angle gearbox 116 and the speed regulator actuator 118 in the other set of motor assemblies through the transmission of the parallel gearbox 112 and the coupling 110, thereby improving the overall stability of the equipment.

[0039] Figure 1 The nuclear power plant emergency diesel generator simulation device 10 shown needs to be used in conjunction with the control mechanism 20 (hereinafter referred to as the control mechanism). Please refer to... Figure 2 As shown, the control mechanism 20 includes a protective frame 200 and a protective cover 202 mounted on the protective frame 200, wherein at least one protective cover 202 can be opened. The top platform is used to place the object under test—the speed governor 206. The control mechanism 20 contains an emulator (located inside the control mechanism's housing, not shown), a 24V power supply, a circuit breaker, a contactor, a relay, a main switch 208, and other electrical equipment. Above the speed governor 206 is a transparent flip-top 204 that can be lifted upwards; the flip-top 204 must have a frame to prevent deformation. During operation, the flip-top 204 is closed, the switch 208 is activated, and the emulator begins to simulate the real-time operating state of a diesel generator.

[0040] exist Figure 2 In the embodiment shown, the protective frame 200 of the control mechanism 20 is made of profile, and the protective cover 202 is made of sheet metal assembly, with dimensions of 600mm (L) * 600mm (W) * 1200mm (H). One side of the control mechanism 20 is connected to the nuclear power plant emergency diesel generator simulation device 10 via an aviation connector. The top platform needs to have an opening to lead the cable with the PCB connector from the bottom of the control box to the top and connect it to the corresponding interface of the speed governor 206. The top platform needs to have cable fixing facilities.

[0041] The following combination Figure 1 and Figure 2 The following diagram illustrates the specific process of performance testing and verification of the diesel generator governor of this invention:

[0042] The hardware-in-the-loop test system for emergency diesel engine speed control system is used to verify the function and performance of the entire speed control system before engine assembly. The system uses a real-time processor to run a simulation model to simulate the operating state of the diesel engine. It connects to the speed controller and actuator under test through I / O interfaces to perform comprehensive and systematic testing of the speed control system under test.

[0043] In the actual testing and verification process, the system hardware includes: a host computer platform, mainly used to run the host computer management software and communicate with the simulator, and to configure and manage the diesel engine model and speed control system function test software through the host computer management software; a simulator and an actuator containing a speed controller; a circuit breaker test unit, providing a convenient interface for signal circuit breaker testing under static or uninterrupted operation, simulating a circuit breaker fault in the speed sensor signal input of the speed controller; an interface unit, used to centrally manage the input and output signals between the simulator, the speed controller, and the actuator; and a power supply system, used to supply power to the system.

[0044] The speed governor 206 outputs an analog signal to control the speed governor actuator 118. The position of the output shaft of the speed governor actuator 118 is obtained through the encoder. The simulator collects the encoder signal through the analog input module, converts the encoder signal into throttle opening and fuel injection quantity, and then transmits the signal to the diesel engine real-time simulation model through the host computer management software.

[0045] The diesel engine real-time simulation model runs in the simulator and feeds back the input diesel engine speed signal through the simulator's analog output module, which is used to control the frequency converter in the actuator.

[0046] The frequency converter controls the frequency converter motor to simulate the operation of a diesel engine. A speed measuring gear 104 that simulates the speed output is installed on the output shaft of the frequency converter motor, and two speed measuring sensors 108 are installed on the mounting base plate 100 to simulate the speed output of the diesel engine. The speed is connected to the speed governor 206, thus forming a closed-loop simulation control process.

[0047] Based on the above principles, the present invention can also make appropriate changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the present invention.

Claims

1. A nuclear power plant emergency diesel generator simulation device, characterized by, The utility model relates to a diesel engine real-time simulation test device, which comprises: a mounting base plate; and two groups of motor assemblies arranged on the mounting base plate, each group of the motor assemblies comprising a variable frequency motor mounted on the mounting base plate, a speed measurement assembly connected to an output shaft of the variable frequency motor, a parallel shaft gearbox connected to the speed measurement assembly, a right-angle gearbox connected to the parallel shaft gearbox, a speed-adjusting actuator connected to the right-angle gearbox, and an angle encoder connected to the speed-adjusting actuator for detecting the rotation angle of an output shaft of the speed-adjusting actuator, wherein a speed regulator to be tested is communicatively connected to the speed measurement assembly and the speed-adjusting actuator, and the two parallel shaft gearboxes are connected by a shaft coupling.

2. The nuclear power plant emergency diesel generator simulation device according to claim 1, characterized in that, The speed measurement assembly comprises a speed measurement gear fixedly connected to the output shaft of the variable frequency motor and a speed measurement sensor for measuring the rotation speed of the speed measurement gear.

3. The nuclear power plant emergency diesel generator simulation device according to claim 1, characterized in that, The input end of the right-angle gearbox is connected to the output shaft of the parallel shaft gearbox, and the output end is connected to the driving shaft of the speed-adjusting actuator.

4. The nuclear power plant emergency diesel generator simulation apparatus according to claim 1, characterized by, The two variable frequency motors, the two speed measurement assemblies, the two parallel shaft gearboxes, and the shaft coupling connecting the two parallel shaft gearboxes of the two groups of motor assemblies are arranged in a U shape on the mounting base plate.

5. The nuclear power plant emergency diesel generator simulation apparatus according to claim 1, characterized by, After receiving the signal from the speed measurement assembly, the speed regulator sends a control signal to the speed-adjusting actuator, the output shaft of the speed-adjusting actuator rotates according to the control signal, the angle encoder measures the rotation angle of the output shaft of the speed-adjusting actuator, and the diesel engine control system collects the rotation angle of the output shaft of the speed-adjusting actuator in real time.

6. The nuclear power plant emergency diesel generator simulation apparatus according to claim 1, characterized by Further comprising a simulator electrically connected to the variable frequency motor and the angle encoder, wherein the simulator contains a diesel engine real-time simulation model.

7. The nuclear power plant emergency diesel generator simulation device according to claim 6, characterized in that Further comprising an upper computer running management software and communicatively connected to the simulator.

8. The nuclear power plant emergency diesel generator simulation device according to claim 7, characterized in that, The speed regulator outputs an analog signal to control the speed-adjusting actuator, the position of the output shaft of the speed-adjusting actuator is obtained through the angle encoder, the simulator collects the encoder signal and converts it into the throttle opening and the fuel injection amount, and the signal is transmitted to the diesel engine real-time simulation model through the upper computer.

9. The nuclear power plant emergency diesel generator simulation device according to any one of claims 1 to 8, characterized in that, A frame and a protection plate arranged on the frame are arranged around the mounting base plate, a top cover rotatable is arranged on the top of the frame, and the mounting base plate, the frame, the protection plate, and the top cover jointly form a protection space to effectively protect the devices therein.

10. The nuclear power plant emergency diesel generator simulation device according to claim 9, characterized in that, The protection plate is slidable relative to the frame to facilitate entry into the protection space from the side.

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