Portable nuclear power LOCA identification test electronic test cabin and system identification method thereof

Abstract

The invention provides a portable nuclear power LOCA identification test electronic test cabin and a system identification method thereof, the portable nuclear power LOCA identification test electronic test cabin comprises an electronic test cabin box and a master control server, and the electronic test cabin box is provided with a simulation real test cabin system and an electronic test cabin box system. The operation steps of system identification of the electronic test cabin system are as follows: S1, determining priori knowledge of an identification target and the system; s2, performing system identification on the test cabin response model, and recording response output data according to an LOCA test scheme; s3, model parameters are obtained, and performance simulation of the test chamber is completed; s4, carrying out algorithm verification, teaching and training through an electronic test cabin system; s5, comparing model parameters with response data, and performing algorithm verification and optimization; and S6, the main control server updates the algorithm, a new operator is replaced, and the step S4 is continued. In the application, the pressure and temperature impact of the LOCA test are subjected to controlled object simulation, a control algorithm, a control signal, host communication and the like of the test system can be verified, and operation training and teaching are carried out.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power LOCA qualification tests, and particularly to a portable electronic test chamber for nuclear power LOCA qualification tests and a system identification method thereof. Background Art

[0002] In order to ensure the safety of nuclear reactors, it is necessary not only to conduct in-depth research on the physical and thermal characteristics of nuclear reactor cores, but also to innovate and optimize the system equipment responsible for monitoring and controlling the safe operation of nuclear power. With the development of nuclear power technology, the types and characteristics of nuclear reactors are also constantly changing. From the first generation to the fourth generation, from large-scale to small-scale, from single-function to multi-function, from open-type to closed-type, from traditional to advanced, the design and operation of nuclear reactors are facing new requirements and challenges. In order to adapt to these changes, the system equipment responsible for monitoring and controlling the safe operation of nuclear power also needs to be continuously innovated and improved to improve its performance, reliability, intelligence, flexibility, economy, etc.

[0003] Therefore, conducting destructive tests on equipment by simulating nuclear accidents is conducive to testing the actual usage and product life of various products. A system with stable and reliable operation is the most important link in the safe operation of the nuclear power industry. In the safety operation test of equipment, the environmental parameters during accidents need to be used as the environmental standards for the extreme environmental thermal shock experiment established by the research topic. Through this environmental standard, the working performance of various electrical appliances and equipment and the performance degradation situation during continuous operation in this environment are detected.

[0004] Future LOCA qualification test systems must meet the qualification requirements of second-generation and third-generation nuclear power units. However, currently, most LOCA tests rely on manual operation by test personnel, making it difficult to accurately control the temperature and pressure curves of LOCA tests. Summary of the Invention

[0005] The purpose of the present invention is to provide a portable electronic test chamber for nuclear power LOCA qualification tests and a system identification method thereof, which have the same thermal-pressure response parameters as the LOCA test system and can be used as a digital simulation test chamber. By receiving the same control signal, it returns the response of the ideal controlled object. This portable electronic test chamber is convenient to carry and move, and is easy to operate.

[0006] Based on a large-scale LOCA test system, this application is equipped with a self-built multi-scenario simulation model and a self-made portable LOCA simulation test control box, and deeply studies the valve control quantity and the temperature-pressure response algorithm of the test chamber. The ultimate goal is to build a LOCA test system that can cover the LOCA test requirements of all types of nuclear power units and meet the requirements of special high-temperature and high-pressure tests.

[0007] To achieve the above object, the present invention provides a portable nuclear power LOCA identification test electronic test chamber, which includes an electronically test chamber box and a main control server connected by signals. The electronically test chamber box is provided with a simulated real test chamber system and an electronically test chamber box system. The simulated real test chamber system is used to simulate the test operation of a LOCA single test chamber;

[0008] The simulated real test chamber system includes a boiler system, a high-temperature and high-pressure steam chamber, an air compressor, a high-pressure air chamber, a hot steam regulating valve, an intake air regulating valve, an exhaust regulating valve, and a LOCA test chamber. The boiler system is connected to the high-temperature and high-pressure steam chamber, and the high-temperature and high-pressure steam chamber is connected to the LOCA test chamber through the hot steam regulating valve; the air compressor is connected to the high-pressure air chamber, and the high-pressure air chamber is connected to the LOCA test chamber through the intake air regulating valve; the LOCA test chamber is connected with the exhaust regulating valve, and the main control server is respectively connected to the boiler system, the high-temperature and high-pressure steam chamber, the air compressor, the high-pressure air chamber, and the LOCA test chamber for control;

[0009] The electronically test chamber box system includes a touch display screen, a main control processing system, a driving power supply system, a temperature-pressure sensor group, and a communication system. The touch display screen is connected to the main control processing system for control, and the driving power supply system supplies power to the main control processing system; the communication system is used to transmit control signals and feedback signals between the main control processing system and the main control server; the main control processing system controls the input quantity of the LOCA test chamber and, in cooperation with the temperature-pressure sensor group, collects the output variable data of the LOCA test chamber, that is, a test chamber response model is established based on the relationship between the input quantity and the output variable; the test chamber response model is used to perform system identification on the control signal response data of a certain type of test chamber to complete the performance simulation of the test chamber.

[0010] Further, in the portable nuclear power LOCA identification test electronic test chamber, the main control processing system controls the hot steam regulating valve, the intake air regulating valve, and the exhaust regulating valve to control different input quantities on the LOCA test chamber, that is, the input quantities are respectively the valve openings of the hot steam regulating valve, the intake air regulating valve, and the exhaust regulating valve; the main control processing system collects data inside the LOCA test chamber through the temperature-pressure sensor group to obtain the output variables of the LOCA test chamber, that is, the output variables are respectively the temperature and pressure inside the LOCA test chamber.

[0011] Further, in the portable nuclear power LOCA identification test electronic test chamber, the structure of the electronic test chamber box includes a touch display screen, an electronic test chamber body, a main control board, an ARM embedded core board, a switching power supply, a replaceable battery, a thermocouple, a pressure gauge, network communication, WiFi communication, a data acquisition card, a DSP integration unit, a signal amplifier, and an actuator. The main control processing system includes the main control board and the ARM embedded core board. The drive power system includes the switching power supply and the replaceable battery. The temperature-pressure sensor group includes the thermocouple and the pressure gauge. The communication system includes the network communication and the WiFi communication.

[0012] Further, in the portable nuclear power LOCA identification test electronic test chamber, the electronic test chamber box system further includes an alarm system. The alarm system is controllably connected to the main control processing system. The alarm system includes an alarm lamp and a speaker.

[0013] Further, in the portable nuclear power LOCA identification test electronic test chamber, there are four high-temperature and high-pressure steam chambers, which are arranged in parallel with each other. The pressure of the high-temperature and high-pressure steam chambers is 0.8 - 1 MPa, and the steam temperature is higher than 400 °C.

[0014] Further, in the portable nuclear power LOCA identification test electronic test chamber, the pressure of the high-pressure air chamber is 0.8 - 1 MPa, the temperature is room temperature, and the median value is 25 °C.

[0015] Further, in the portable nuclear power LOCA identification test electronic test chamber, the simulated real test chamber system further includes a sprinkler. The sprinkler is connected to the LOCA test chamber through a sprinkler regulating valve.

[0016] The present invention also proposes a system identification method for a portable nuclear power LOCA identification test electronic test chamber. Using the above-mentioned portable nuclear power LOCA identification test electronic test chamber, the operation steps for the electronic test chamber box system to perform system identification based on the test chamber response model are as follows:

[0017] S1: Determine the identification target and the prior knowledge of the system, that is, determine the control signal and its response data of a certain type of test chamber to be identified.

[0018] S2: The test chamber response model uses the least squares method for system identification. According to the LOCA test plan of the simulated real test chamber system, based on the input control signal of a certain type of test chamber to be identified, record the response output data at each stage under normal operation, that is, record the response output data under thermal shock, cooling and pressure reduction, and long-term maintenance respectively based on the test chamber response model.

[0019] S3: Obtain model parameters to complete the performance simulation of the test chamber;

[0020] S4: The operator conducts algorithm verification, teaching, and training through the electronic test chamber system of the electronic test chamber box;

[0021] S5: For algorithm verification, compare the model parameters obtained from the test chamber response model with the response data of a certain type of test chamber to be identified, so as to optimize the algorithm;

[0022] S6: The main control server updates the algorithm, replaces the new operator, and continues with S4.

[0023] Furthermore, in the system identification method of the portable nuclear power LOCA identification test electronic test chamber, the steps of establishing the test chamber response model are as follows:

[0024] According to different control input quantities, the output variables are correspondingly affected, that is, when the determined temperature difference ΔT = T cabin -T set , the pressure difference ΔP = P cabin -P set , they respectively become:

[0025]

[0026] Among them: T cabin is the real-time temperature of the test chamber, T set is the expected temperature of the test chamber, P cabin is the real-time pressure of the test chamber, P set is the expected pressure of the test chamber, d is the differential symbol, t is the test time, K steam is the valve opening of the hot steam regulating valve, K air is the valve opening of the intake air regulating valve, K exha is the valve opening of the intake air regulating valve;

[0027] Based on f T (K steam ,K air ,K exha ,ΔT), it can be decomposed into the effects of the hot steam regulating valve, the intake air regulating valve, and the exhaust regulating valve on the temperature of the LOCA test chamber. Since the influence of exhaust on temperature is relatively small, that is, only study the influence of the hot steam regulating valve and the intake air regulating valve on the temperature of the LOCA test chamber, and denote as Then:

[0028]

[0029] Among them: ω T-steam is the system frequency of the hot steam regulating valve in terms of temperature, k T-steamis the influence coefficient of the valve opening of the hot steam control valve on the system in terms of temperature, T d is the differential time constant, ω T-air is the system frequency of the intake control valve in terms of temperature, k T-air is the influence coefficient of the valve opening of the intake control valve on the system in terms of temperature;

[0030] Based on f P (K steam ,K air ,K exha ,ΔP) can be decomposed into the influences of three valves, namely the hot steam control valve, the intake control valve, and the exhaust control valve, on the pressure in the LOCA test chamber, and is denoted as Then:

[0031]

[0032] Among them: ω P-steam is the system frequency of the hot steam control valve in terms of pressure, k P-steam is the influence coefficient of the valve opening of the hot steam control valve on the system in terms of pressure, ω P-air is the system frequency of the intake control valve in terms of pressure, k P-air is the influence coefficient of the valve opening of the intake control valve on the system in terms of pressure, ω P-exha is the system frequency of the exhaust control valve in terms of pressure, k P-exha is the influence coefficient of the valve opening of the exhaust control valve on the system in terms of pressure;

[0033] Therefore, the transfer function matrix of the LOCA test chamber can be expressed as:

[0034]

[0035] Among them: G steam-Temp (s) is the transfer function of the hot steam control valve relative to the temperature of the test chamber, G steam-Pres (s) is the transfer function of the hot steam control valve relative to the pressure of the test chamber, G air-Teemp (s) is the transfer function of the intake control valve relative to the temperature of the test chamber, G air-Pres (s) is the transfer function of the intake control valve relative to the pressure of the test chamber, G exha-Pres (s) is the transfer function of the exhaust control valve relative to the pressure of the test chamber;

[0036] That is, the mathematical model of the test chamber response model is:

[0037]

[0038] Among them: y Temp is the temperature response model, yPres is the pressure response model, s is the frequency in the Laplace transform domain, and u steam is the actual opening degree of the hot steam regulating valve, and u air is the actual opening degree of the intake regulating valve, and u exha is the actual opening degree of the exhaust regulating valve.

[0039] Furthermore, in the system identification method of the portable nuclear power LOCA identification test electronic test chamber, the temperature control of the LOCA test chamber is simulated by a second-order inertia lag link to form an approximate model:

[0040]

[0041] where: K is the total gain of the system, T 1 and T 2 are the inertia time constants of the system, s is a complex variable, e is the base of the natural logarithm, and τ is the lag time of the system.

[0042] Compared with the prior art, the beneficial effects of the present invention are mainly reflected in: the system simulates the controlled object for the control of the pressure and temperature shocks of the LOCA test, creates a heat convection simulation model of the LOCA test chamber, and uses the same controlled object parameter characteristics as the real test chamber to optimize the transient control method of the LOCA test system in the extreme heat shock link, making the system closer to the extreme state when the real LOCA accident occurs. System identification is carried out on the response of the LOCA test chamber under extreme heat shock. Based on the portability, economy of the portable LOCA identification electronic test chamber box and its 1:1 reduction ability to the real LOCA test chamber, this electronic test chamber system can not only be used to verify the control algorithms, control signals, host communications, etc. of the LOCA test system, but also be used for the training and teaching of the operators of the LOCA test system. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a schematic diagram of the functional structure of the portable nuclear power LOCA identification test electronic test chamber in the present invention;

[0044] Figure 2 is an application schematic diagram of the portable nuclear power LOCA identification test electronic test chamber in the present invention;

[0045] Figure 3 is a schematic diagram of the structure of the system simulating the real test chamber in the present invention;

[0046] Figure 4 is a schematic diagram of the process of system identification carried out by the electronic test chamber box system in the present invention;

[0047] Figure 5 is a schematic diagram of the internal structure of the electronic test chamber box in the present invention;

[0048] Figure 6 It is a schematic structural diagram of the main control board in the electronic test chamber box of the present invention;

[0049] Figure 7 It is a schematic diagram of the functional module structure of the main control processing system in the electronic test chamber box system of the present invention;

[0050] Figure 8 It is the technical roadmap of the electronic test chamber box system of the present invention

[0051] Figure 9 It is a schematic diagram of the relationship between the input and output variables of the LOCA test chamber in the present invention;

[0052] Figure 10 It is a double-parameter control block diagram of the input and output variables of the LOCA test chamber in the present invention;

[0053] Figure 11a It is an energy-saving control block diagram of the LOCA test chamber in the electronic test chamber box of the present invention;

[0054] Figure 11b It is Figure 11a The control block diagram of the energy-saving module part in

[0055] Figure 12 It is a schematic diagram of the LOCA test chamber in the real experimental equipment;

[0056] Figure 13a It is a schematic structural diagram of the horizontal LOCA test chamber in the present invention;

[0057] Figure 13b It is a schematic diagram of the temperature measurement points of the horizontal LOCA test chamber in the present invention;

[0058] Figure 13c It is a schematic diagram of the temperature and pressure state distribution inside the test chamber every 0.2 s from the 0th s to the 1st s during the thermal shock test of the horizontal LOCA test chamber in the present invention;

[0059] Figure 13d It is a schematic diagram of the temperature change during the thermal shock test of the horizontal LOCA test chamber in the present invention;

[0060] Figure 13e It is a schematic diagram of the temperature and pressure effect inside the test chamber during the instantaneous thermal shock test of the horizontal LOCA test chamber in the present invention;

[0061] Figure 14a It is a schematic structural diagram of the vertical LOCA test chamber in the present invention;

[0062] Figure 14b It is a schematic diagram of the temperature and pressure transformation curve of the vertical LOCA test chamber in the present invention;

[0063] Figure 14c It is a schematic diagram of the temperature and pressure state distribution inside the vertical LOCA test chamber of the present invention at 0.4 s during the thermal shock test;

[0064] Figure 14d It is a schematic diagram of the temperature and pressure state distribution inside the vertical LOCA test chamber of the present invention at 1.0 s during the thermal shock test;

[0065] Figure 14e It is a schematic diagram of the pressure distribution in the XY plane inside the vertical LOCA test chamber of the present invention;

[0066] Figure 14f It is a schematic diagram of the temperature vector in the XY plane inside the vertical LOCA test chamber of the present invention;

[0067] Figure 15a It is a temperature curve graph of the anti-interference test of the LOCA test chamber of the present invention after the temperature and pressure approach the expected values;

[0068] Figure 15b It is a pressure curve graph of the anti-interference test of the LOCA test chamber of the present invention after the temperature and pressure approach the expected values;

[0069] Figure 15c It is the real-time consumption of thermal steam in the anti-interference test of the LOCA test chamber of the present invention after the temperature and pressure approach the expected values;

[0070] Figure 15d It is the amount of funds consumed for converting thermal steam into liquefied petroleum gas in the LOCA test chamber of the present invention after the temperature and pressure approach the expected values. Detailed implementation manners

[0071] The portable nuclear power LOCA identification test electronic test chamber of the present invention will be described in more detail below with reference to the schematic diagrams, in which the preferred embodiments of the present invention are shown. It should be understood that those skilled in the art can modify the present invention described herein while still achieving the advantageous effects of the present invention. Therefore, the following description should be understood as broad guidance for those skilled in the art and not as a limitation on the present invention.

[0072] In the description of the present invention, it should be noted that for orientation terms, such as the terms "center", "horizontal", "vertical", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the indicated orientation and positional relationship are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present invention.

[0073] In the present invention, unless otherwise clearly specified and defined, for the terms "assembly", "connection", "coupling", they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection; it can be directly connected, or connected through an intermediate medium, and can be internally connected and communicated between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] In the following paragraphs, the present invention will be described more specifically by way of example with reference to the drawings. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the drawings are all in a very simplified form and use non-precise scales, only for the purpose of conveniently and clearly assisting in explaining the embodiments of the present invention.

[0075] As Figures 1 to 2 shown, the present invention provides a portable nuclear power LOCA qualification test electronic test chamber, including an electronic test chamber box 1 and a main control server 2 connected by signals. An analog real test chamber system 3 and an electronic test chamber box system are provided in the electronic test chamber box 1. The analog real test chamber system 3 is used to simulate the test operations of a LOCA single test chamber.

[0076] Among them, as Figure 3As shown in the figure, the simulated real test chamber system 3 includes a boiler system 31, a high-temperature and high-pressure steam chamber 32, an air compressor 33, a high-pressure air chamber 34, a hot steam regulating valve 35, an intake air regulating valve 36, an exhaust regulating valve 37, a LOCA test chamber 38, a sprinkler 391 and a sprinkler regulating valve 392. The boiler system 31 is connected to the high-temperature and high-pressure steam chamber 32, and the high-temperature and high-pressure steam chamber 32 is connected to the LOCA test chamber 38 through the hot steam regulating valve 35; the air compressor 33 is connected to the high-pressure air chamber 34, and the high-pressure air chamber 34 is connected to the LOCA test chamber 38 through the intake air regulating valve 36. The sprinkler 391 is connected to the LOCA test chamber 38 through the sprinkler regulating valve 392; an exhaust regulating valve 37 is provided in connection with the LOCA test chamber 38. The main control server 2 is respectively connected to the boiler system 31, the high-temperature and high-pressure steam chamber 32, the air compressor 33, the high-pressure air chamber 34, the LOCA test chamber 38 and the sprinkler 391 for control.

[0077] Furthermore, there are four high-temperature and high-pressure steam chambers 32, which are arranged in parallel with each other. The pressure of the high-temperature and high-pressure steam chambers 32 is 0.8 - 1 MPa, and the steam temperature is higher than 400 °C; the pressure of the high-pressure air chamber 34 is 0.8 - 1 MPa, the temperature is room temperature, and the median value is 25 °C.

[0078] Meanwhile, the electronic test chamber box system includes a touch display screen 11, a main control processing system, a drive power supply system, a temperature-pressure sensor group, a communication system and an alarm system. The touch display screen 11 and the alarm system are both connected to the main control processing system for control. The drive power supply system supplies power to the main control processing system; the communication system is used to transmit the control signals and feedback signals between the main control processing system and the main control server 2; the alarm system is used to give a warning reminder for the alarm signals between the main control processing system and the main control server 2; the main control processing system controls the input quantities of the LOCA test chamber 38 and cooperates with the temperature-pressure sensor group to collect the output variable data of the LOCA test chamber 38, that is, a test chamber response model is established based on the relationship between the input quantities and the output variables; the test chamber response model is used to perform system identification on the control signal response data of a certain type of test chamber to complete the performance simulation of the test chamber.

[0079] Specifically, as Figure 3 shown, the main control processing system controls the hot steam regulating valve 35, the intake air regulating valve 36 and the exhaust regulating valve 37 to control different input quantities on the LOCA test chamber 38. The input quantities are respectively the valve openings of the hot steam regulating valve 35, the intake air regulating valve 36 and the exhaust regulating valve 37; the main control processing system collects the data inside the LOCA test chamber 38 through the temperature-pressure sensor group to obtain the output variables of the LOCA test chamber 38. The output variables are respectively the temperature and pressure inside the LOCA test chamber 38. That is, as Figure 9As shown in the figure, the main control processing system controls the intake air volume of the LOCA test chamber 38 by controlling the valve openings of the hot steam regulating valve 35 and the intake air regulating valve 36, and controls the exhaust air volume of the LOCA test chamber 38 by controlling the valve opening of the exhaust regulating valve 37. By coupling the regulating valves for steam intake, air intake and exhaust, the temperature and pressure inside the test chamber are finally accurately controlled to be close to or envelope the temperature and pressure conditions at the nuclear power plant site during a real LOCA accident, reproducing the accident scene to verify the safety, effectiveness and reliability of nuclear power facilities.

[0080] Meanwhile, as Figures 5 to 6 shown in the figure, the structure of the electronic test chamber box 1 includes a touch display screen 11, an electronic test chamber body 12, a main control board 131, an ARM embedded core board 132, a switching power supply 141, a replaceable battery 142, a thermocouple 151, a barometer 152, a network communication 161, a WiFi communication 162, a data acquisition card, a DSP integration unit, a signal amplifier and an actuator, and has the same controlled object parameter characteristics as the real test chamber. The main control processing system includes a main control board 131 that meets the EMC electromagnetic compatibility performance requirements and an ARM embedded core board 132 that integrates and is compatible with the PLC protocol. The drive power supply system includes a switching power supply 141 and a replaceable battery 142. The temperature-pressure sensor group includes a thermocouple 151 and a barometer 152. The communication system includes a network communication 161 and a WiFi communication 162. The alarm system includes an alarm light 171 and a speaker 172.

[0081] Furthermore, the touch display screen 11 uses a 9-inch liquid crystal display screen, and the touch operation is used to perform real-time operations on the test, which is convenient and fast. In this embodiment, the portable electronic test chamber box 1 can complete functions such as parameter aggregation setting, automatic test execution, data saving and backup, and its volume is small, comparable to that of a suitcase, and is externally provided with rich external sensor interfaces and communication interfaces. At the same time, the electronic test chamber box 1 supports NIOPC protocol and Modbus protocol communication and can be compatible with the upper computer of various systems. As Figure 8 shown in the figure, the technical route of the electronic test chamber box 1 is shown. First, the system has a sturdy and durable mechanical structure and a small and portable appearance, has good scalability, and can realize the connection of various expansion devices or interfaces; second, its electrical components have good EMC performance, the circuit design is reasonable, and it must maintain normal operation near nuclear power devices with strong interference; in addition, the software part of the system can complete LOCA accident simulations of various reactor types, including domestic and foreign ones; finally, in terms of algorithm verification, the device can correctly respond to control signals, and based on the built-in optimized ADRC algorithm, it can output correct control quantities and feedback externally.

[0082] As Figure 4As shown in the figure, the present invention also proposes a system identification method for a portable nuclear power LOCA identification test electronic test chamber. Using the above-mentioned portable nuclear power LOCA identification test electronic test chamber, the operating steps of the electronic test chamber box system for system identification based on the test chamber response model are as follows:

[0083] S1: Determine the identification target and the prior knowledge of the system, that is, determine the control signal and its response data of a certain type of test chamber to be identified;

[0084] S2: The test chamber response model uses the least squares method for system identification. According to the LOCA test plan for simulating the real test chamber system 3, based on the control signal of a certain type of test chamber to be identified input, record the response output data at each stage under normal operation, that is, record the response output data under thermal shock, cooling and pressure reduction, and long-term maintenance based on the test chamber response model;

[0085] S3: To obtain the model parameters and complete the performance simulation of the test chamber;

[0086] S4: The operator conducts algorithm verification, teaching and training through the electronic test chamber box system of the electronic test chamber box 1;

[0087] S5: For algorithm verification, compare the model parameters obtained by the test chamber response model with the response data of a certain type of test chamber to be identified to optimize the algorithm;

[0088] S6: The main control server 2 updates the algorithm, replaces the new operator, and continues with S4.

[0089] Specifically, to realize the operation of the test chamber system in electronic simulation, based on simulating the real test chamber system 3, the steps for establishing the test chamber response model are as follows:

[0090] As Figure 9 shown, according to the different control of the three input quantities, the output variables are correspondingly affected. The three input quantities are respectively the valve opening K steam of the hot steam regulating valve 35, the valve opening K air of the intake air regulating valve 36, and the valve opening K exha of the intake air regulating valve 37, which are controlled in real time by the main control processing system. The output variables are respectively the actual temperature T and the actual pressure P of the LOCA test chamber 38. Regarding the simulated real test chamber system 3 as a second-order system, for different influencing factors, its system response is different, that is, the temperature difference ΔT = T cabin -T set , and the pressure difference ΔP = P cabin -P set , which are respectively changed to:

[0091]

[0092] Among them: T cabin is the real-time temperature of the test chamber, T set is the desired temperature of the test chamber, P cabin is the real-time pressure of the test chamber, P set is the desired pressure of the test chamber, d is the differential symbol, and t is the test time;

[0093] Based on f T (K steam , K air , K exha , ΔT) can be decomposed into the effects of three valves, namely the hot steam regulating valve 35, the intake regulating valve 36, and the exhaust regulating valve 37, on the temperature of the LOCA test chamber 38. In the analysis of this model, since the influence of exhaust on temperature is relatively small, it is ignored here, that is, only the effects of the hot steam regulating valve 35 and the intake regulating valve 36 on the temperature of the LOCA test chamber 38 are studied, and is denoted as Then:

[0094]

[0095] Among them: ω T-steam is the system frequency of the hot steam regulating valve 35 in terms of temperature, k T-steam is the influence coefficient of the valve opening of the hot steam regulating valve 35 on the system in terms of temperature, T d is the differential time constant, ω T-air is the system frequency of the intake regulating valve 36 in terms of temperature, k T-air is the influence coefficient of the valve opening of the intake regulating valve 36 on the system in terms of temperature;

[0096] Based on f P (K steam , K air , K exha , ΔP) can be decomposed into the effects of three valves, namely the hot steam regulating valve 35, the intake regulating valve 36, and the exhaust regulating valve 37, on the pressure of the LOCA test chamber 38, and is denoted as Then:

[0097]

[0098] Among them: ω P-steam is the system frequency of the hot steam regulating valve 35 in terms of pressure, k P-steam is the influence coefficient of the valve opening of the hot steam regulating valve 35 on the system in terms of pressure, ω P-air is the system frequency of the intake regulating valve 36 in terms of pressure, k P-air is the influence coefficient of the valve opening of the intake regulating valve 36 on the system in terms of pressure, ωP-exha is the system frequency of the exhaust control valve 37 in terms of pressure, k P-exha is the influence coefficient of the valve opening of the exhaust control valve 37 on the system in terms of pressure;

[0099] Therefore, the transfer function matrix of the LOCA test chamber 38 can be expressed as:

[0100]

[0101] Where: G steam-Temp (s) is the transfer function of the hot steam control valve 35 relative to the test chamber temperature, G steam-Pres (s) is the transfer function of the hot steam control valve 35 relative to the test chamber pressure, G air-Temp (s) is the transfer function of the intake control valve 36 relative to the test chamber temperature, G air-Pres (s) is the transfer function of the intake control valve 36 relative to the test chamber pressure, G exha-Pres (s) is the transfer function of the exhaust control valve 37 relative to the test chamber pressure;

[0102] That is, the mathematical model of the test chamber response model is:

[0103]

[0104] Where: y Temp is the temperature response model, y Pres is the pressure response model, s is the frequency in the Laplace transform domain, u steam is the actual opening of the hot steam control valve 35, u air is the actual opening of the intake control valve 36, u exha is the actual opening of the exhaust control valve 37.

[0105] In summary, the above values are respectively system-identified, and these parameters are used as the response basis for simulating the real test chamber system 3.

[0106] At the same time, in the actual control process of the LOCA test system, since the response curve is disturbed, the curve fitted by the step response method has an error from the actual system. The system identification method of this application mainly uses the least squares method, and can obtain the model parameters according to the actual data. That is, the temperature control of the LOCA test chamber 38 is simulated by a second-order inertial lag link to form an approximate model:

[0107]

[0108] Where: K is the total gain of the system, T 1 , T 2T is the inertia time constant of the system, s is a complex variable defined as s = σ + jω, where σ and ω are the real and imaginary parts respectively, and j is the imaginary unit; e is the base of the natural logarithm (approximately equal to 2.71828), and τ is the lag time of the system.

[0109] As Figure 10 shown, in the LOCA dual-parameter control block diagram adopted in this embodiment, where LADRC1 and LADRC2 are the dual-parameter control algorithms for the coupled test chamber based on the ADRC algorithm. After parameter tuning and verification, the control effect of the above dual parameters can be achieved.

[0110] For a linear time-delay control system, if an accurate system model can be obtained and the system lag time τ of the model is very small, some conventional methods such as Smith compensation can be used. Otherwise, high bandwidth will cause the system to become unstable; for some systems where the lag time τ is several times larger than the system inertia time constant T, methods such as fuzzy control and expert control can be used, but they are relatively complex. Since the LOCA test chamber system is a controlled object with a relatively large input lag characteristic, in the actual design process, the lag link of the controlled object must be considered. This application uses high-order ADRC to solve the control problem of a low-order control system with a lag link, that is, the lag link of the system is equivalent to two inertia links, and the time constant of the inertia link will become an additional adjustable parameter of the ADRC.

[0111] In addition, during the process of maintaining stability of temperature and pressure, the compensation amount calculation will gradually reduce its own compensation value, and at the same time, the second set of LADRC calculation does not close the exhaust volume. Finally, the system reaches temperature and pressure stability, and the opening degree of the intake control valve 36 is reduced to the minimum value required to maintain multivariable stability. In order to save energy to the greatest extent, especially for the hot steam control valve 35, as Figures 11a to 11b shown, the control system can be improved, where a third set of LADRC and an energy-saving function are newly added. The role of this control law is to start adjusting the hot steam control valve 35 and the intake control valve 36 smaller after the system reaches the desired temperature and desired pressure, so as to achieve the purpose of saving energy.

[0112] In this embodiment, the real experimental equipment replaced is Figure 12 the LOCA test chamber shown. The test chamber is divided into vertical and horizontal types, with an inner diameter of 1.5 m - 2 m, a main body effective length of 2.5 m, an effective volume of approximately 3.5 m3 - 6 m3, a designed maximum pressure resistance of 1.2 MPa, and a maximum temperature of 350 °C. It has steam inlets and outlets, thermocouple installation holes, a liquid injection and drainage system, and multiple through holes.

[0113] As Figures 13c to 13dAs shown, after the steam is input at 400°C, the temperature of the horizontal test chamber will rise sharply. The main test data is the surface temperature of the test item. However, whether the surface temperature of the test item can reach the set temperature becomes an unknown parameter to be measured. According to the different steam input flow rates and the placement positions of the test items, test chamber models with different parameters need to be selected for thermal shock simulation tests. Therefore, the simulation results under different parameter data will have very different results, and different results will have different impacts: (1) The formation of turbulent airflows will affect the stability of the test items in the chamber and the stability of the sensor measurement state; (2) The relative positions of the input port and the sensor are directly related to whether the temperature measured by the sensor is the temperature of the test chamber after the steam heat transfer in the test chamber or the direct temperature of the input steam. Ultimately, it affects the adjustment accuracy and response speed of the control system for temperature and pressure. As Figure 13e shown, in the LOCA test, an instantaneous thermal shock test is conducted on the horizontal test chamber. The flow rate of the high-temperature and high-pressure steam is extremely fast. The steam velocity and pressure flow irregularly and complexly over time and space, and the flow direction becomes blurred. Vortices are generated in the test chamber, which is called turbulence. The flow of the high-temperature and high-pressure steam in the LOCA test chamber belongs to turbulent flow.

[0114] To more accurately simulate the temperature and pressure changes in the chamber, a numerical method using Fluent software to simulate the turbulent phenomenon is used, such as Figures 14c to 14f shown, in this project, the standard k-ε model of the Reynolds-averaged method is used. The unsteady N-S equations are averaged over time, and the time-averaged control equations are solved to predict and simulate the state of turbulence. Figure 14c and Figure 14d show the internal temperature and pressure state distributions of the test chamber at 0.4 s and 1 s of the thermal shock. Figure 14e is the pressure distribution diagram and temperature vector diagram in the XY plane. Figure 14f is the static pressure force point and velocity vector diagram in the XY plane. This model mainly obtains the turbulent viscosity and solves the Reynolds stress after solving the solutions of the turbulent kinetic energy k and the turbulent dissipation rate ε. High-temperature and high-pressure steam is used in the LOCA test chamber, and the steam flow rate is fast and the Reynolds number is high. Therefore, the k-ε model needs to be used to solve the flow field in the chamber.

[0115] As Figures 15a to 15d shown, under the control of the improved active disturbance rejection control algorithm (ADRC), when the temperature and pressure are close to the expected values, the device still maintains stability in the face of disturbance tests. Figure 15a shows the temperature curve. Figure 15b shows the pressure curve. Figure 15c shows the real-time consumption of the hot steam. It can be seen that after the relevant algorithm reaches stability, the supply of the hot steam has been maintained at a very small amount. Figure 15dShows the amount of funds consumed in converting hot steam into liquefied petroleum gas in the improved ADRC algorithm (solid line). The data shows that when the temperature and pressure reach the expected values, the energy consumption gap between the two algorithms is not significant. In the later maintenance stage, the control algorithm with an energy-saving function can significantly save economic expenditure. Even with uncontrollable heat dissipation, it still reduces a large amount of liquefied gas loss compared to the traditional algorithm.

[0116] In addition, the electronic test chamber system of the electronic test chamber box 1 of the present application is developed through cross-research based on the multi-disciplinary intersection theories and technologies such as fluid mechanics, mechatronics, signal processing, computer software and hardware, etc. It has the same controlled object parameter characteristics as the real test chamber and can be used to verify control laws or conduct teaching.

[0117] Since in all LOCA laboratories, during the research on the intelligent control algorithm of the LOCA test chamber, on-site debugging is often required. Before each debugging, it is necessary to reserve liquefied petroleum gas for filling the over-temperature steam boiler, which will result in relatively large costs and resource expenditures. The present application builds an electronic test chamber, fully models and system identifies on the test chamber based on the real LOCA test system using the known transfer function, and efficiently completes the real test chamber system of electronic simulation, so that users can directly perform operations such as algorithm verification, teaching, and training on the portable electronic test chamber box 1.

[0118] In summary, in this embodiment, the proposed portable nuclear power LOCA identification test electronic test chamber and its system identification method simulate the controlled object of the control theory of the pressure and temperature shocks of the LOCA test, create a thermal convection simulation model of the LOCA test chamber, and use the same controlled object parameter characteristics as the real test chamber to optimize the transient control method of the LOCA test system in the extreme heat shock link, making the system closer to the extreme state when a real LOCA accident occurs. System identification is carried out on the response of the LOCA test chamber under extreme heat shock. Based on the portability, economy of the portable LOCA identification electronic test chamber box and its 1:1 restoration ability of the real LOCA test chamber, this electronic test chamber system can not only be used to verify the control algorithm, control signal, host communication, etc. of the LOCA test system, but also conduct operator training and teaching for the LOCA test system.

[0119] The above are only the preferred embodiments of the present invention and do not impose any limitation on the present invention. Any person skilled in the art within the technical field, without departing from the scope of the technical solution of the present invention, makes any form of equivalent replacement or modification and other changes to the technical solution and technical content disclosed by the present invention, all of which belong to the content of the technical solution of the present invention and are still within the protection scope of the present invention.

Claims

1. A portable nuclear power LOCA identification test electronic test cabin, characterized in that: It comprises a signal-connected electronic test chamber box (1) and a main control server (2), wherein the electronic test chamber box (1) is provided with a simulated real test chamber system (3) and an electronic test chamber box system, wherein the simulated real test chamber system (3) is used to simulate the test operation of a LOCA single test chamber; The simulated real test chamber system (3) comprises a boiler system (31), a high-temperature and high-pressure steam chamber (32), an air compressor (33), a high-pressure air chamber (34), a hot steam regulating valve (35), an air intake regulating valve (36), an exhaust regulating valve (37) and a LOCA test chamber (38); the boiler system (31) is connected to the high-temperature and high-pressure steam chamber (32), and the high-temperature and high-pressure steam chamber (32) is connected to the LOCA test chamber (38) through the hot steam regulating valve (35); the air compressor (33) is connected to the high-pressure air chamber (34), and the high-pressure air chamber (34) is connected to the LOCA test chamber (38) through the air intake regulating valve (36); the LOCA test chamber (38) is connected to the exhaust regulating valve (37); the main control server (2) is respectively connected to the boiler system (31), the high-temperature and high-pressure steam chamber (32), the air compressor (33), the high-pressure air chamber (34) and the LOCA test chamber (38); The electronic test chamber system comprises a touch screen (11), a main control processing system, a drive power system, a temperature-pressure sensor group and a communication system, wherein the touch screen (11) is control-connected to the main control processing system, and the drive power system supplies power to the main control processing system; the communication system is used to transmit control signals and feedback signals between the main control processing system and a main control server (2); the main control processing system controls the input quantity of the LOCA test chamber (38) and cooperates with the temperature-pressure sensor group to collect output variable data of the LOCA test chamber (38), that is, to establish a test chamber response model based on the relationship between the input quantity and the output variable; the test chamber response model is used to perform system identification on the control signal response data of a certain model of test chamber to complete the test chamber performance simulation.

2. The portable nuclear power LOCA identification test electronic test cabin according to claim 1 is characterized in that: The main control processing system manipulates the hot steam regulating valve (35), the air intake regulating valve (36) and the exhaust regulating valve (37) to control different input quantities on the LOCA test chamber (38), that is, the input quantities are valve openings of the hot steam regulating valve (35), the air intake regulating valve (36) and the exhaust regulating valve (37); the main control processing system collects data in the LOCA test chamber (38) through the temperature-pressure sensor group to obtain output variables of the LOCA test chamber (38), that is, the output variables are the temperature and pressure in the LOCA test chamber (38).

3. The portable nuclear power LOCA identification test electronic test cabin according to claim 1 is characterized in that: The structure of the electronic test chamber box (1) comprises a touch screen (11), an electronic test chamber body (12), a main control board (131), an ARM embedded core board (132), a switching power supply (141), a replaceable battery (142), a thermocouple (151), a barometer (152), network communication (161), WiFi communication (162), a data acquisition card, a DSP integrated unit, a signal amplifier and an actuator; the main control processing system comprises the main control board (131) and the ARM embedded core board (132); the driving power supply system comprises the switching power supply (141) and the replaceable battery (142); the temperature-pressure sensor group comprises the thermocouple (151) and the barometer (152); and the communication system comprises the network communication (161) and WiFi communication (162).

4. The portable nuclear power LOCA identification test electronic test cabin according to claim 1 is characterized in that: The electronic test chamber system also includes an alarm system, which is control-connected to the main control processing system and includes an alarm light (171) and a speaker (172).

5. The portable nuclear power LOCA identification test electronic test cabin according to claim 1 is characterized in that: There are four high-temperature and high-pressure steam chambers (32) which are arranged in parallel with each other. The pressure of the high-temperature and high-pressure steam chambers (32) is 0.8-1 MPa, and the steam temperature is higher than 400°C.

6. The portable nuclear power LOCA identification test electronic test cabin according to claim 1 is characterized in that: The pressure of the high-pressure air chamber (34) is 0.8-1 MPa, the temperature is room temperature, and the median value is 25°C.

7. The portable nuclear power LOCA identification test electronic test cabin according to claim 1 is characterized in that: The simulated real test chamber system (3) further comprises a sprayer (391), and the sprayer (391) is connected to the LOCA test chamber (38) via a spray regulating valve (392).

8. A system identification method for a portable nuclear power LOCA identification test electronic test cabin, using the portable nuclear power LOCA identification test electronic test cabin as claimed in claim 1, characterized in that: The operation steps of the electronic test chamber system for system identification based on the test chamber response model are as follows: S1: Determine the prior knowledge of the identification target and system, that is, determine the control signal and response data of a certain type of test cabin to be identified; S2: The test cabin response model uses the least square method to perform system identification. According to the LOCA test scheme simulating the real test cabin system (3), based on the input control signal of a certain type of test cabin to be identified, the response output data of each stage under normal operation is recorded, that is, based on the test cabin response model, the response output data under the conditions of thermal shock, temperature reduction and pressure reduction, and long-term maintenance are recorded; S3: To obtain model parameters and complete the test chamber performance simulation; S4: The operator performs algorithm verification, teaching and training through the electronic test chamber system of the electronic test chamber (1); S5: To verify the algorithm, the model parameters obtained by the test cabin response model are compared with the response data of a certain type of test cabin to be identified, so as to optimize the algorithm; S6: The master server (2) updates the algorithm, replaces the new operator, and continues with S4.

9. The system identification method of the portable nuclear power LOCA identification test electronic test cabin according to claim 8 is characterized in that: The steps of establishing the test chamber response model are as follows: Depending on the control input, the corresponding output variable is affected, even if the temperature difference ΔT = T cabin -T set , pressure difference ΔP=P cabin -P set , respectively become: Where: T cabin is the real-time temperature of the test chamber, T set is the expected temperature of the test chamber, P cabin is the real-time pressure of the test chamber, P set is the expected pressure of the test chamber, d is the differential sign, t is the test time, K steam is the valve opening of the hot steam regulating valve (35), K air is the valve opening of the intake regulating valve (36), K exha is the valve opening of the air intake regulating valve (37); Based on f T (K steam ,K air ,K exha ,ΔT) can be decomposed into the influence of the three valves, namely, the hot steam control valve (35), the air intake control valve (36) and the exhaust control valve (37), on the temperature of the LOCA test chamber (38). Since the exhaust gas has a small influence on the temperature, only the influence of the hot steam control valve (35) and the air intake control valve (36) on the temperature of the LOCA test chamber (38) is studied, and Recorded as but: Where: T-steam is the system frequency of the hot steam control valve (35) in terms of temperature, k T-steam is the influence coefficient of the valve opening of the hot steam control valve (35) on the system in terms of temperature, T d is the differential time constant, ω T-air is the system frequency of the intake control valve (36) in terms of temperature, k T-air is the influence coefficient of the valve opening of the air intake regulating valve (36) on the system in terms of temperature; Based on f P (K steam ,K air ,K exha ,ΔP) can be decomposed into the influence of the three valves, namely, the hot steam regulating valve (35), the air inlet regulating valve (36) and the exhaust regulating valve (37), on the pressure of the LOCA test chamber (38), and Recorded as but: Where: P-steam is the system frequency of the hot steam regulating valve (35) in terms of pressure, k P-steam is the influence coefficient of the valve opening of the hot steam regulating valve (35) on the system in terms of pressure, ω P-air is the system frequency of the intake regulating valve (36) in terms of pressure, k P-air is the influence coefficient of the valve opening of the intake regulating valve (36) on the system in terms of pressure, ω P-exha is the system frequency of the exhaust regulating valve (37) in terms of pressure, k P-exha is the influence coefficient of the valve opening of the exhaust regulating valve (37) on the system in terms of pressure; Therefore, the transfer function matrix of the LOCA test chamber (38) can be expressed as: Where: G steam-Temp (s) is the transfer function of the hot steam control valve (35) relative to the test chamber temperature, G steam-Pres (s) is the transfer function of the hot steam control valve (35) relative to the test chamber pressure, G air-Temp (s) is the transfer function of the air intake control valve (36) relative to the test chamber temperature, G air-Pres (s) is the transfer function of the air inlet regulating valve (36) relative to the test chamber pressure, G exha-Pres (s) is the transfer function of the exhaust control valve (37) relative to the test chamber pressure; That is, the mathematical model of the test chamber response model is: Where: y Temp is the temperature response model, y Pres is the pressure response model, s is the frequency in the Laplace transform domain, u steam is the actual opening of the hot steam regulating valve (35), u air is the actual opening of the intake regulating valve (36), u exha is the actual opening of the exhaust regulating valve (37).

10. The system identification method of the portable nuclear power LOCA identification test electronic test cabin according to claim 8, characterized in that: The temperature control of the LOCA test chamber (38) is simulated by a second-order inertia lag link, forming an approximate model: Where: K is the total gain of the system, T1 and T2 are the inertia time constants of the system, s is a complex variable, e is the base of the natural logarithm, and τ is the lag time of the system.

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