Control device for emergency diesel generating set of nuclear power plant

Abstract

The utility model discloses a control device for an emergency diesel generating set of a nuclear power plant. The control device comprises a first main control board and a second main control board electrically connected with the first main control board, the first main control board and the second main control board adopt main and standby working modes and form a main control unit; the main control unit is connected with the analog input unit, the switching value input unit, the switching value output unit and the communication expansion unit; the power supply module is connected with the main control unit, the analog quantity input unit, the switching value input unit, the switching value output unit and the communication expansion unit, and the power supply module is powered by dual power supplies and is used for providing electric energy for each component unit. According to the utility model, in consideration of the high safety requirement of the nuclear power plant, through redundancy design, dual power supply of the power supply module and independence of multiple modules, the risk of fault occurrence is reduced to the greatest extent, and it is ensured that the emergency diesel generator set of the nuclear power plant can operate more efficiently and safely in an emergency.

Description

Technical Field

[0001] This utility model relates to the technical field of emergency diesel generator sets for nuclear power plants, and in particular to a control device for emergency diesel generator sets for nuclear power plants. Background Technology

[0002] Emergency diesel generator sets (EDGs) for nuclear power plants are used to provide emergency power to nuclear safety facilities when a nuclear power plant loses normal power supply, enabling safe shutdown of the nuclear power plant, cooling of the reactor, and prevention of serious nuclear accidents. They are of vital importance to ensuring the safety of nuclear power plants.

[0003] Currently, the control devices for emergency diesel generator sets in nuclear power plants are generally quite simple, consisting of only a controller and peripheral circuitry. These devices collect operational data, process and analyze it, and then output control commands. This design requires the controller to handle a large amount of data, resulting in a heavy operational load and making it impossible to monitor changes in the diesel generator set's operating status in real time. Furthermore, due to low data exchange efficiency, instability or slow response may occur when dealing with complex emergencies, leading to delays in handling urgent situations and, in severe cases, even system shutdowns. In addition, some control devices have poor compatibility with host computers, making seamless integration with modern monitoring systems difficult.

[0004] Therefore, there is a need to provide a control device for emergency diesel generator sets in nuclear power plants that can improve the stability and reliability of the system, enhance the speed and accuracy of data processing, and enable emergency diesel generator sets in nuclear power plants to operate more efficiently, safely, and intelligently. Utility Model Content

[0005] In view of this, it is necessary to provide a control device for emergency diesel generator sets in nuclear power plants to solve the technical problems of poor stability, low reliability and insufficient information processing capabilities of existing control devices for emergency diesel generator sets in nuclear power plants.

[0006] To achieve the above technical objectives, this utility model provides a control device for an emergency diesel generator set in a nuclear power plant, including a first main control board and a second main control board electrically connected to the first main control board; the first main control board and the second main control board adopt a main and standby working mode, and the first main control board and the second main control board constitute a main control unit;

[0007] The main control unit is connected to the analog input unit, the digital input unit, the digital output unit, and the communication expansion unit. The analog input unit is used to acquire continuous physical quantity signals during the operation of the diesel generator set. The digital input unit is used to acquire passive dry contact signals of the diesel generator set. The digital output unit is used to output control commands to control the actuators. The communication expansion unit is used to realize data interaction between the device and the host computer.

[0008] The power supply module is connected to the main control unit, analog input unit, digital input unit, digital output unit and communication expansion unit. The power supply module adopts dual power supply to provide power to each component unit.

[0009] Furthermore, the main control unit, analog input unit, digital input unit, digital output unit, communication expansion unit, and power module all adopt a modular plug-in board structure and are electrically interconnected through a bus baseboard.

[0010] Furthermore, the electrical connection between the first main control board and the second main control board includes I / O port connection and CAN communication connection;

[0011] When using I / O port connection, the input I / O port of the first main control board is connected to the output I / O port of the second main control board, and the output I / O port of the first main control board is connected to the input I / O port of the second main control board, for mutual notification of operating status;

[0012] When using CAN communication, the CAN_TX pin of the first main control board is connected to the CAN_RX pin of the second main control board, and the CAN_RX pin of the first main control board is connected to the CAN_TX pin of the second main control board, in order to send data frames to each other in real time and send the running status.

[0013] Furthermore, the power supply module includes a reverse connection protection unit, a filtering unit, and a monitoring unit connected in sequence. The output terminal of the monitoring unit is connected to the input terminals of the first DC power conversion module and the second DC power conversion module. The output terminals of the first DC power conversion module and the second DC power conversion module are connected to the input terminal of the dual power switching module. The output terminal of the dual power switching module is connected to the main control unit, the analog input unit, the digital input unit, the digital output unit, and the communication expansion unit.

[0014] Furthermore, the analog input unit includes an analog signal input board and an AD sampling chip; the output terminal of the analog input board is connected to the input terminal of the AD sampling chip, and the output terminal of the AD sampling chip is connected to the main control unit.

[0015] The analog signal input board includes a signal sampling module, a first low-pass filter module, a signal isolation module, and a second low-pass filter module connected in sequence.

[0016] Furthermore, the AD sampling chip is an AD7606C chip.

[0017] Furthermore, the signal isolation module uses an AMC1300 chip.

[0018] Furthermore, the digital input unit includes a digital signal input board and a first I / O expansion chip; the output terminal of the digital signal input board is connected to the input terminal of the first I / O expansion chip.

[0019] The digital input board includes an EMC protection module, a resistor divider module, and an opto-isolation module. The EMC protection module is used to eliminate external interference. The resistor divider module is used to achieve voltage adaptation and current limiting, converting passive dry contact signals into logic levels. The opto-isolation module is used to achieve electrical isolation between the input signals and the main control unit, preventing high-voltage crosstalk and common-mode interference.

[0020] Furthermore, the first IO expansion chip uses the TCA9535 chip.

[0021] Furthermore, the switch output unit includes a second I / O expansion chip, the output of which is connected to the input of the first opto-isolation circuit, the output of which is connected to the input of the drive module, and the output of the drive module is connected to the relay circuit; the input of the signal matching circuit is connected to the relay circuit for data acquisition; the output of the signal matching circuit is connected to the input of the second opto-isolation circuit, and the output of the second opto-isolation circuit is connected to the input of the second I / O expansion chip.

[0022] The beneficial effects of this invention are as follows: This device adopts a redundant design with a main control unit and a backup main control unit. Even if the main control unit fails, the backup unit can quickly take over, ensuring the system always maintains stable operation and solving the problem of single point of failure. Simultaneously, the main control unit can monitor the operating status of the diesel generator set in real time and make dynamic adjustments according to different working conditions, enhancing the system's ability to respond to emergencies. The power module adopts a dual-power supply design, which not only enhances the reliability of the power supply but also ensures that the system does not completely fail when the power is interrupted, improving the stability of the entire system. Furthermore, this device also uses a high-efficiency communication expansion unit, enabling seamless connection with modern monitoring systems, improving the real-time nature of remote monitoring and the convenience of operation. This device enables emergency diesel generator sets to operate more efficiently, safely, and intelligently. Attached Figure Description

[0023] Figure 1 A schematic diagram of an embodiment of a control device for an emergency diesel generator set in a nuclear power plant provided by this utility model;

[0024] Figure 2 A schematic diagram showing the connection between the first main control board and the second main control board provided by this utility model;

[0025] Figure 3 A circuit diagram of the power supply module provided by this utility model;

[0026] Figure 4 Circuit structure diagram of the dual power supply switching module provided by this utility model;

[0027] Figure 5 A structural diagram of the analog input unit provided by this utility model;

[0028] Figure 6 This is a schematic diagram of the structure of the switch input unit provided by this utility model;

[0029] Figure 7 This is a schematic diagram of the structure of the switch output unit provided by this utility model. Detailed Implementation

[0030] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0031] In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically defined.

[0032] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0033] This utility model provides a control device for emergency diesel generator sets in nuclear power plants, which will be described in detail below.

[0034] Please see Figure 1 , Figure 1 The present invention provides a structural diagram of an embodiment of a control device for an emergency diesel generator set in a nuclear power plant, including a first main control board 101 and a second main control board 102 electrically connected to the first main control board 101; the first main control board 101 and the second main control board 102 adopt a main and standby working mode, and the first main control board 101 and the second main control board 102 constitute a main control unit 100.

[0035] The main control unit 100 is connected to the analog input unit 200, the digital input unit 300, the digital output unit 400, and the communication expansion unit 500. The analog input unit 200 is used to acquire continuous physical quantity signals during the operation of the diesel generator set. The digital input unit 300 is used to acquire passive dry contact signals of the diesel generator set. The digital output unit 400 is used to output control commands to control the actuators. The communication expansion unit 500 is used to realize data interaction between the device and the host computer.

[0036] The power supply module 600 is connected to the main control unit 100, analog input unit 200, digital input unit 300, digital output unit 400 and communication expansion unit 500. The power supply module 600 adopts dual power supply to provide power to each component unit.

[0037] The nuclear power plant emergency diesel generator set control device provided in this embodiment adopts a redundant design with a main control unit and a backup main control unit. Even if the main control unit fails, the backup unit can quickly take over, ensuring the system always maintains stable operation and solving the problem of single point of failure. Simultaneously, the main control unit can monitor the operating status of the diesel generator set in real time and make dynamic adjustments according to different working conditions, enhancing the system's ability to respond to emergencies. The power module adopts a dual-power supply design, which not only enhances the reliability of the power supply but also ensures that the system does not completely fail during power outages, improving the overall system stability. Furthermore, this device also employs a high-efficiency communication expansion unit, enabling seamless connection with modern monitoring systems, improving the real-time nature of remote monitoring and the convenience of operation. This device enables the emergency diesel generator set to operate more efficiently, safely, and intelligently.

[0038] In a preferred embodiment, the main control unit, analog input unit, digital input unit, digital output unit, communication expansion unit, and power module all adopt a modular plug-in board structure and are electrically interconnected through a bus baseboard.

[0039] Modular design allows for independent upgrades or replacements of individual units. This design enables the addition or removal of modules based on actual needs, facilitating system expansion or the selection of different functional modules for different application scenarios. When a unit fails, the faulty module can be quickly replaced without shutting down the entire system, significantly improving system maintenance efficiency and reliability while reducing repair time and costs. Electrical interconnection via a bus backplane reduces the large amount of point-to-point wiring found in traditional circuits, resulting in a simpler design and reduced wiring complexity and space requirements.

[0040] As a preferred embodiment, such as Figure 2 As shown, the electrical connection between the first main control board and the second main control board includes I / O port connection and CAN communication connection;

[0041] When using I / O port connection, the input I / O port of the first main control board is connected to the output I / O port of the second main control board, and the output I / O port of the first main control board is connected to the input I / O port of the second main control board, for mutual notification of operating status;

[0042] When using CAN communication, the CAN_TX pin of the first main control board is connected to the CAN_RX pin of the second main control board, and the CAN_RX pin of the first main control board is connected to the CAN_TX pin of the second main control board, in order to send data frames to each other in real time and send the running status.

[0043] It should be noted that the two main control boards operate in a primary / standby mode. Under normal circumstances, the first main control board is in operation, while the second main control board is in hot standby mode. When the first main control board fails, the second main control board can immediately take over the operation, ensuring that the system does not shut down due to a single point of failure, thereby improving the overall reliability of the system.

[0044] In a preferred embodiment, the power module includes a reverse connection protection unit, a filtering unit, and a monitoring unit connected in sequence;

[0045] The output of the monitoring unit is connected to the input of the main control unit, the first DC power conversion module, and the second DC power conversion module. The outputs of the first DC power conversion module and the second DC power conversion module are connected to the input of the dual power switching module. The output of the dual power switching module is connected to the main control unit, the analog input unit, the digital input unit, the digital output unit, and the communication expansion unit.

[0046] As a specific example, such as Figure 3 As shown, Figure 3 The diagram showcases the internal structure and connection diagram of a typical power supply module in practical applications. The reverse connection protection unit prevents incorrect power connection and avoids damage caused by reversed power supply. The filtering unit effectively filters out high-frequency noise in the input power supply, ensuring the stability of the power supply signal and providing more reliable power support for subsequent circuits. The monitoring unit performs self-checks and protection against overvoltage and undervoltage. Through the cooperation of the first and second DC power conversion modules, the dual-power switching module can intelligently switch to the optimal power supply when there are two power inputs, avoiding the impact of power interruptions on the equipment and improving the reliability of the device's power supply.

[0047] As a specific example, such as Figure 4 As shown, Figure 4The circuit diagram of the dual power supply switching module is shown. The input voltage of the power supply module is DC 18V-75V (adaptive). It uses a DC module power supply, which, after passing through an anti-interference filter circuit, isolates the +24V / +5V voltage required by the output device. Neither voltage group shares a common ground. The dual power supply switching module uses a diode controller MX5050T. The MX5050T is a high-side NMOS controller capable of withstanding transient voltages of 100V, with an input voltage range of 5 to 50V. It has a built-in charge pump and a small package, integrated into an SOT23-6L package, significantly reducing board space. Compared to using diodes for reverse connection protection, the reverse connection protection circuit using this chip has lower on-resistance and conduction losses, and results in a simpler circuit with fewer components.

[0048] In a preferred embodiment, the analog input unit includes an analog signal input board and an AD sampling chip; the output terminal of the analog input board is connected to the input terminal of the AD sampling chip, and the output terminal of the AD sampling chip is connected to the main control unit.

[0049] The analog signal input board includes a signal sampling module, a first low-pass filter module, a signal isolation module, and a second low-pass filter module connected in sequence.

[0050] In a preferred embodiment, the AD sampling chip is an AD7606C chip.

[0051] In a preferred embodiment, the signal isolation module uses an AMC1300 chip.

[0052] As a specific example, such as Figure 5 As shown, Figure 5 The block diagram of the analog input unit is shown. Specifically, after sampling the analog signal, a low-pass filter removes high-frequency interference, and the signal is isolated, amplified, and conditioned by an isolation operational amplifier before being sent to the AD sampling chip for acquisition. The analog input board can integrate an AD acquisition chip to convert the analog signal into a digital signal on-site and transmit it to the main control board via the SPI interface.

[0053] This embodiment uses the AD7606C-16 as the AD acquisition chip. The AD7606C-16 is an 8-channel 16-bit synchronous sampling analog-to-digital data acquisition system (DAS). Each channel includes analog input clamping protection, a programmable gain amplifier (PGA), a low-pass filter (LPF), and a 16-bit successive approximation register (SAR) analog-to-digital converter (ADC). The AD7606C-16 also includes flexible digital filters, low drift, a 2.5V precision reference voltage source and a reference voltage source buffer for driving the ADC, as well as flexible parallel and serial interfaces. The AD7606C-16 operates from a single 5V supply and can accommodate a variety of input ranges when sampling at a throughput of 1 MSPS across all channels.

[0054] Furthermore, the signal isolation module utilizes the TI AMC1300 isolation operational amplifier. The AMC1300 is an isolated precision amplifier whose output and input circuitry are separated by a highly resistant electromagnetic interference (EMI) isolation barrier. This barrier is certified to provide enhanced electrical isolation up to 5kVRMS according to VDE V0884-11 and UL1577 standards. When used in conjunction with an isolated power supply, this isolation amplifier can isolate components in a system operating at different common-mode voltage levels and prevent damage to lower-voltage devices.

[0055] In a preferred embodiment, the digital input unit includes a digital signal input board and a first I / O expansion chip; the output terminal of the digital signal input board is connected to the input terminal of the first I / O expansion chip.

[0056] The digital input signal board includes an EMC protection module, a resistor divider module, and an opto-isolation module. The EMC protection module is used to eliminate external interference. The resistor divider module is used to achieve voltage adaptation and current limiting, converting passive dry contact signals into logic levels. The opto-isolation module is used to achieve electrical isolation between the input signal and the main control unit, preventing high-voltage crosstalk and common-mode interference. As a preferred embodiment, the first IO expansion chip uses the TCA9535 chip.

[0057] In a preferred embodiment, the first IO expansion chip is a TCA9535 chip.

[0058] As a specific example, such as Figure 6 As shown, Figure 6 A schematic diagram of the digital input unit is shown. Due to the limited number of pins on the main control board, the output of the digital signal input board is connected to an I / O expansion chip. The I / O expansion chip can support more input and output signals, facilitating system expansion as needed. Furthermore, the design employs electrical isolation, current limiting, and anti-interference to improve the system's tolerance to external interference, further enhancing signal accuracy and stability. The digital input signal, after passing through EMC protection to eliminate external interference, is then converted to TTL level via resistor voltage division, current limiting, and opto-isolation, and sent to the main control board through the expanded I / O port. This invention uses the IIC interface I / O expansion chip TCA9535. The TCA9535 consists of two 8-bit configuration (input or output selectable), input ports, output ports, and a polarity inversion (active high or active low) register. Upon power-up, the I / O is configured as an input. The system controller can enable the I / O as input or output by writing to the I / O configuration bits, providing 16-bit general-purpose parallel input and output (I / O) expansion for a two-wire bidirectional IIC bus or (SMBus) protocol.

[0059] In a preferred embodiment, the switch output unit includes a second I / O expansion chip. The output terminal of the second I / O expansion chip is connected to the input terminal of the first opto-isolation circuit. The output terminal of the first opto-isolation circuit is connected to the input terminal of the drive module. The output terminal of the drive module is connected to the relay circuit. The input terminal of the signal matching circuit is connected to the relay circuit for data acquisition from the relay circuit. The output terminal of the signal matching circuit is connected to the input terminal of the second opto-isolation circuit. The output terminal of the second opto-isolation circuit is connected to the input terminal of the second I / O expansion chip.

[0060] As a specific example, such as Figure 7 As shown, Figure 7 A schematic diagram of the digital output unit is shown. The digital output board integrates a second I / O expansion chip, which converts the input and output signals into digital signals locally and transmits them to the main control board via the I / O interface. Alternatively, the input and output signals can be directly sent to the main control board for acquisition by the integrated I / O expansion chip. In some embodiments, the relays include electromagnetic relays and solid-state relays. The solid-state relay selected is a Panasonic solid-state relay-MOS output (PHOTOMOS), AQY214EHAX, with a load voltage of 60V, a maximum A current of 1.6A, and features high sensitivity and low on-resistance.

[0061] The main control board communicates via internal SPI and IIC bus to complete data acquisition and control of various modules such as analog input board (AI), digital input board (DI), and digital output board (DO). At the same time, it monitors the operating status of each module and sends the acquired data and operating status to the monitoring center and display terminal.

[0062] In some embodiments, the main control board uses the RM41L950 as the MCU. The RM48L952 device integrates an ARM Cortex-R4F floating-point CPU, which provides a high efficiency of 1.66 DMIPS / MHz and has a configuration capable of running at up to 220 MHz with a processing power of up to 365 DMIPS.

[0063] As a specific implementation, the communication expansion unit includes an external Ethernet interface and an external CAN interface. Specifically, the external Ethernet interface is configured with two channels, using the W5500 chip, and the CPU interface is an SPI interface. The W5500 is a fully hardware TCP / IP embedded Ethernet controller, providing a simpler internet connectivity solution for embedded systems. The external CAN interface uses the CTM1051M isolated CAN transceiver. The CTM series isolated transceiver is a module product used for CAN-bus transmission and isolation in industrial fields, effectively solving problems such as bus interference and communication anomalies. Compared with traditional designs, the CTM series products integrate complete isolated DC-DC circuitry, signal isolation circuitry, CAN bus transceiver circuitry, and bus protection circuitry, achieving higher integration and reliability.

[0064] The nuclear power plant emergency diesel generator set control device provided by this utility model offers an efficient, reliable, and easy-to-maintain control system through its reasonable modular design, dual main control board redundancy backup, power supply guarantee, and real-time data acquisition and remote control. It meets the high requirements of nuclear power plants for safety, stability, and emergency response capabilities.

[0065] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A control device for an emergency diesel generator set in a nuclear power plant, characterized in that, It includes a first main control board and a second main control board electrically connected to the first main control board; the first main control board and the second main control board adopt a main and standby working mode, and the first main control board and the second main control board constitute the main control unit; The main control unit is connected to the analog input unit, the digital input unit, the digital output unit, and the communication expansion unit. The analog input unit is used to acquire continuous physical quantity signals during the operation of the diesel generator set. The digital input unit is used to acquire passive dry contact signals of the diesel generator set. The digital output unit is used to output control commands to control the actuators. The communication expansion unit is used to realize data interaction between the device and the host computer. The power supply module is connected to the main control unit, analog input unit, digital input unit, digital output unit and communication expansion unit. The power supply module adopts dual power supply to provide power to each component unit.

2. The nuclear power plant emergency diesel generator set control device according to claim 1, characterized in that, The main control unit, analog input unit, digital input unit, digital output unit, communication expansion unit, and power module all adopt a modular plug-in structure and are electrically interconnected through a bus baseboard.

3. The nuclear power plant emergency diesel generator set control device according to claim 1, characterized in that, The electrical connection between the first main control board and the second main control board includes I / O port connection and CAN communication connection; When using I / O port connection, the input I / O port of the first main control board is connected to the output I / O port of the second main control board, and the output I / O port of the first main control board is connected to the input I / O port of the second main control board, for mutual notification of operating status; When using CAN communication, the CAN_TX pin of the first main control board is connected to the CAN_RX pin of the second main control board, and the CAN_RX pin of the first main control board is connected to the CAN_TX pin of the second main control board, in order to send data frames to each other in real time and send the running status.

4. The nuclear power plant emergency diesel generator set control device according to claim 1, characterized in that, The power module includes a reverse connection protection unit, a filtering unit, and a monitoring unit connected in sequence. The output terminal of the monitoring unit is connected to the input terminals of the first DC power conversion module and the second DC power conversion module. The output terminals of the first DC power conversion module and the second DC power conversion module are connected to the input terminal of the dual power switching module. The output terminal of the dual power switching module is connected to the main control unit, the analog input unit, the digital input unit, the digital output unit, and the communication expansion unit.

5. The nuclear power plant emergency diesel generator set control device according to claim 1, characterized in that, The analog input unit includes an analog signal input board and an AD sampling chip; the output terminal of the analog input board is connected to the input terminal of the AD sampling chip, and the output terminal of the AD sampling chip is connected to the main control unit. The analog signal input board includes a signal sampling module, a first low-pass filter module, a signal isolation module, and a second low-pass filter module connected in sequence.

6. The nuclear power plant emergency diesel generator set control device according to claim 5, characterized in that, The AD sampling chip used is the AD7606C chip.

7. The nuclear power plant emergency diesel generator set control device according to claim 5, characterized in that, The signal isolation module uses the AMC1300 chip.

8. The nuclear power plant emergency diesel generator set control device according to claim 1, characterized in that, The digital input unit includes a digital signal input board and a first I / O expansion chip; the output terminal of the digital signal input board is connected to the input terminal of the first I / O expansion chip. The digital input board includes an EMC protection module, a resistor divider module, and an opto-isolation module. The EMC protection module is used to eliminate external interference. The resistor divider module is used to achieve voltage adaptation and current limiting, converting passive dry contact signals into logic levels. The opto-isolation module is used to achieve electrical isolation between the input signals and the main control unit, preventing high-voltage crosstalk and common-mode interference.

9. The nuclear power plant emergency diesel generator set control device according to claim 8, characterized in that, The first I / O expansion chip uses the TCA9535 chip.

10. The nuclear power plant emergency diesel generator set control device according to claim 1, characterized in that, The digital output unit includes a second I / O expansion chip. The output of the second I / O expansion chip is connected to the input of the first opto-isolation circuit. The output of the first opto-isolation circuit is connected to the input of the drive module. The output of the drive module is connected to the relay circuit. The input of the signal matching circuit is connected to the relay circuit for data acquisition. The output of the signal matching circuit is connected to the input of the second opto-isolation circuit. The output of the second opto-isolation circuit is connected to the input of the second I / O expansion chip.

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