Nuclear power unit voltage stabilizer control device and voltage stabilizer

Abstract

The invention provides a nuclear power unit voltage stabilizer control device and a voltage stabilizer. The nuclear power unit voltage stabilizer control device comprises a temperature sensor; a first input end of the first comparator is connected with the temperature sensor; the first input end of the PID controller is connected with the output end of the first comparator; the input end of the nonlinear saturation controller is connected with the output end of the PID controller; the input end of the bias arithmetic unit is connected with the output end of the nonlinear saturation controller; the input end of the first transfer function arithmetic unit is connected with the output end of the bias arithmetic unit; the input end of the first delay arithmetic unit is connected with the output end of the first transfer function arithmetic unit, and the output end of the first delay arithmetic unit is connected with the second input end of the first comparator. According to the embodiment of the invention, the stability of heating power can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power, and particularly relates to a pressurizer control system and a pressurizer. Background Art

[0002] In the technology of nuclear power plant power generation, the steam cavity construction of the pressurizer of a nuclear power unit is one of the key technologies. In the related art, water is filled into the pressurizer, and a heating component is used to heat the water, so as to form a steam cavity inside the pressurizer. In the related art, the power of the heating component mainly relies on manual control by an operator, and the power of the heating component is unstable. If the power of the heating component is too large, it may cause excessive pressure inside the pressurizer and failure of steam cavity construction. If the power of the heating component is small, it may cause too long time for the pressurizer to construct the steam cavity, and rapid steam cavity construction cannot be achieved.

[0003] It can be seen that in the related art, there is a problem of poor stability of the heating power during the steam cavity construction of the pressurizer. Summary of the Invention

[0004] Embodiments of the present invention provide a control device and a pressurizer for a nuclear power unit pressurizer to solve the problem of poor stability of the heating power during the steam cavity construction of the pressurizer in the related art.

[0005] To achieve the above object, an embodiment of the present invention provides a control device for a nuclear power unit pressurizer, including:

[0006] A temperature sensor for monitoring the temperature of the pressurizer;

[0007] A first comparator, a first input end of the first comparator is connected to the temperature sensor;

[0008] A proportional-integral-derivative (PID) controller, a first input end of the PID controller is connected to an output end of the first comparator;

[0009] A non-linear saturation controller, an input end of the non-linear saturation controller is connected to an output end of the PID controller, and an output end of the non-linear saturation controller is used to be connected to a heating component arranged inside the pressurizer;

[0010] An offset arithmetic unit, an input end of the offset arithmetic unit is connected to an output end of the non-linear saturation controller;

[0011] A first transfer function arithmetic unit, an input end of the first transfer function arithmetic unit is connected to an output end of the offset arithmetic unit;

[0012] A first delay arithmetic unit, an input end of the first delay arithmetic unit is connected to an output end of the first transfer function arithmetic unit, and an output end of the first delay arithmetic unit is connected to a second input end of the first comparator.

[0013] In one embodiment, the pressure regulator control device of the nuclear power unit further includes:

[0014] A second comparator, the first input end of the second comparator is connected to the output end of the first comparator, and the output end of the second comparator is connected to the PID controller;

[0015] A second transfer function calculator, the input end of the second transfer function calculator is connected to the output end of the bias calculator;

[0016] A third comparator, the first input end of the third comparator is connected to the output end of the second transfer calculator, and the output end of the third comparator is connected to the second input end of the second comparator;

[0017] A second delay calculator, the input end of the second delay calculator is connected to the output end of the second transfer function calculator, and the output end of the second delay calculator is connected to the second input end of the third comparator.

[0018] In one embodiment, the first input end and the second input end of the second comparator are positive feedback input ends, the first input end of the third comparator is a positive feedback input end, and the second input end of the third comparator is a negative feedback input end.

[0019] In one embodiment, the first input end of the first comparator is a positive feedback input end, and the second input end of the first comparator is a negative feedback input end.

[0020] In one embodiment, the pressure regulator control device of the nuclear power unit further includes:

[0021] A first oscilloscope, the first oscilloscope is connected to the output end of the non-linear saturation controller, and the first oscilloscope is used to display the power of the heating component controlled by the non-linear saturation controller for heating.

[0022] In one embodiment, the pressure regulator control device of the nuclear power unit further includes:

[0023] A second oscilloscope, the input end of the second oscilloscope is connected to the output end of the temperature sensor, and the second oscilloscope is used to display the real-time temperature of the pressure regulator.

[0024] An embodiment of the present invention further provides a pressure regulator, the pressure regulator is of a hollow structure, a heating component is provided inside the pressure regulator, and the pressure regulator includes the pressure regulator control device of the nuclear power unit described in any one of the above.

[0025] One of the above technical solutions has the following advantages or beneficial effects:

[0026] In an embodiment of the present invention, a pressurizer control device for a nuclear power unit is provided, including: a temperature sensor for monitoring the temperature of the pressurizer; a first comparator, with the first input terminal of the first comparator connected to the temperature sensor; a proportional-integral-derivative (PID) controller, with the first input terminal of the PID controller connected to the output terminal of the first comparator; a non-linear saturation controller, with the input terminal of the non-linear saturation controller connected to the output terminal of the PID controller, and the output terminal of the non-linear saturation controller for connecting to a heating component provided in the pressurizer; a bias calculator, with the input terminal of the bias calculator connected to the output terminal of the non-linear saturation controller; a first transfer function calculator, with the input terminal of the first transfer function calculator connected to the output terminal of the bias calculator; a first delay calculator, with the input terminal of the first delay calculator connected to the output terminal of the first transfer function calculator, and the output terminal of the first delay calculator connected to the second input terminal of the first comparator. In this way, the temperature of the pressurizer is collected by the temperature sensor, and the first target time is determined by the bias calculator, the first transfer function calculator, and the first delay calculator, so that the PID controller can control the heating component to heat the pressurizer through the non-linear saturation controller based on the first target time, thereby realizing the automatic control of the steam cavity building process of the pressurizer and improving the stability of the heating power during the steam cavity building process of the pressurizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for describing the embodiments of the present invention will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0028] Figure 1 is one of the schematic diagrams of the pressurizer control device for a nuclear power unit provided by the embodiment of the present invention;

[0029] Figure 2 is the schematic diagram of the pressurizer of the nuclear power unit provided by the embodiment of the present invention;

[0030] Figure 3 is the second schematic diagram of the pressurizer control device for a nuclear power unit provided by the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0032] As shown Figure 1 in the figure, an embodiment of the present invention provides a pressure regulator control device for a nuclear power unit, including:

[0033] A temperature sensor 10 for monitoring the temperature of the pressure regulator;

[0034] A first comparator 20, with the first input terminal of the first comparator 20 connected to the temperature sensor 10;

[0035] A proportional integral derivative (PID) controller, with the first input terminal of the PID controller 30 connected to the output terminal of the first comparator 20;

[0036] A non-linear saturation controller 40, with the input terminal of the non-linear saturation controller 40 connected to the output terminal of the PID controller 30, and the output terminal of the non-linear saturation controller 40 being used to connect to a heating component 90 arranged inside the pressure regulator;

[0037] An offset operator 50, with the input terminal of the offset operator 50 connected to the output terminal of the non-linear saturation controller 40;

[0038] A first transfer function operator 60, with the input terminal of the first transfer function operator 60 connected to the output terminal of the offset operator 50;

[0039] A first delay operator 70, with the input terminal of the first delay operator 70 connected to the output terminal of the first transfer function operator 60, and the output terminal of the first delay operator 70 connected to the second input terminal of the first comparator 20.

[0040] The above pressure regulator is a pressure regulator in a nuclear power unit, and a heating component 90 is arranged inside the pressure regulator. As Figure 2 shown in the figure, before building the steam cavity, the pressure regulator is filled with water inside, and the water is heated to the saturation temperature through the heating component 90, so as to form a steam cavity above the water level inside the pressure regulator.

[0041] The above temperature sensor 10 is arranged inside the pressure regulator, usually below the water level inside the pressure regulator, so that after the pressure regulator is filled with water before building the steam cavity, the water surface is higher than the temperature sensor 10, and the temperature sensor 10 detects the water temperature to determine the heating effect of the heating component 90. Optionally, multiple temperature sensors 10 can be arranged, evenly distributed inside the pressure regulator, and the real-time temperature inside the pressure regulator is obtained by weighted calculation of the temperatures measured by each temperature sensor 10.

[0042] Furthermore, during the process of establishing the steam cavity of the pressure regulator, the temperature needs to be maintained within a set temperature range, such as 223°C to 226°C. In this case, the temperature input of the nuclear power plant pressure regulator control device is set as a step input. When the temperature sensor 10 detects that the temperature of the pressure regulator is within the set temperature range, the nuclear power plant pressure regulator control device controls the temperature of the pressure regulator. When the temperature sensor 10 detects that the temperature of the pressure regulator is not within the set temperature range, the process of establishing the steam cavity of the pressure regulator is not carried out.

[0043] The first comparator 20 is used to receive the output of the temperature sensor 10 and the output of the first delay arithmetic unit 70. The PID controller 30 is used to perform negative feedback control according to the inside of the pressure regulator, so that when the heating component 90 heats the pressure regulator until the pressure reaches the preset pressure, the temperature of the pressure regulator is also maintained within the set temperature, so as to avoid the situation that the power of the heating component 90 is too large, resulting in excessive pressure inside the pressure regulator, failure to establish the steam cavity, and the situation that the power of the heating component 90 is too small, resulting in too long a time for the pressure regulator to establish the steam cavity and inability to achieve rapid establishment of the steam cavity.

[0044] The above-mentioned non-linear saturation controller 40 is directly connected to the heating component 90, and the non-linear saturation controller 40 is used to control the heating component 90 to heat the pressure regulator within the set power range. Among them, the set power range is the heating power preset in the non-linear saturation controller 40, and the set power range is within the range that the heating component 90 can achieve. For example, the set power range is 0 to 432 kW. Optionally, the power adjustment of the heating component 90 by the non-linear saturation controller 40 can be achieved by the method of constant current variable voltage or by the method of constant voltage variable current. For example, when the voltage remains unchanged, the heating component 90 is connected in series with an adjustable resistor, and the power of the heating component 90 is adjusted by changing the resistance value of the adjustable resistor.

[0045] The above-mentioned bias arithmetic unit 50 is used to correct the output power of the heating component 90. It should be noted that there is a certain loss in the heating power of the heating component 90, and part of the heat will be dissipated during the heating process. The expected temperature inside the pressure regulator cannot be directly calculated by all the heating power, but the dissipated heat needs to be excluded. Among them, the bias arithmetic unit 50 is used to convert the power output by the non-linear saturation controller 40 to control the heating component 90 into the effective power after the output power loss, so as to improve the accuracy of the time for the non-linear saturation controller 40 to control the output of the heating component 90.

[0046] The above-mentioned first transfer function calculator 60 is used to calculate the transfer function of the pressurizer control device of the nuclear power unit, and then determine the time required for heating. Among them, the transfer function is the ratio of the output to the input, that is, the ratio of the output temperature to the input temperature, and / or the ratio of the output pressure to the input pressure. In the first transfer function calculator 60, the first input-output ratio of the pressure and / or temperature corresponding to different times in the pressurizer is calculated based on the first transfer function, and then the heating time is determined.

[0047] Among them, the first transfer function is represented by the following formula:

[0048]

[0049] In the formula, G(s) represents the first ratio at time s, k and τ are constants, and s represents the current time.

[0050] The above-mentioned first delay calculator 70 is used to calculate the first target time for controlling the heating of the pressurizer to the set pressure based on the first ratio obtained by the first transfer function calculator 60. The PID controller 30 controls the heating component 90 to heat the pressurizer based on the first target time through the non-linear saturation controller 40, so as to realize the automatic control of the steam cavity building process of the pressurizer, improve the stability of the control process, and avoid the situation that the power of the heating component 90 is too large, resulting in too high pressure in the pressurizer and failure of steam cavity building, and the power of the heating component 90 is too small, resulting in too long time for the pressurizer to build a steam cavity and unable to realize rapid steam cavity building.

[0051] In an embodiment of the present invention, a pressurizer control device for a nuclear power unit is provided, including: a temperature sensor 10 for monitoring the temperature of the pressurizer; a first comparator 20, the first input terminal of the first comparator 20 is connected to the temperature sensor 10; a proportional-integral-derivative (PID) controller 30, the first input terminal of the PID controller 30 is connected to the output terminal of the first comparator 20; a non-linear saturation controller 40, the input terminal of the non-linear saturation controller 40 is connected to the output terminal of the PID controller 30, and the output terminal of the non-linear saturation controller 40 is used to be connected to a heating component 90 arranged in the pressurizer; a bias operator 50, the input terminal of the bias operator 50 is connected to the output terminal of the non-linear saturation controller 40; a first transfer function operator 60, the input terminal of the first transfer function operator 60 is connected to the output terminal of the bias operator 50; a first delay operator 70, the input terminal of the first delay operator 70 is connected to the output terminal of the first transfer function operator 60, and the output terminal of the first delay operator 70 is connected to the second input terminal of the first comparator 20. In this way, the temperature of the pressurizer is collected by the temperature sensor 10, and a first target time is determined by the bias operator 50, the first transfer function operator 60, and the first delay operator 70, so that the PID controller 30 can control the heating component 90 to heat the pressurizer based on the first target time through the non-linear saturation controller 40, thereby realizing the automatic control of the steam cavity building process of the pressurizer and improving the stability of the heating power during the steam cavity building process of the pressurizer.

[0052] It should be noted that, when the pressurizer control device for a nuclear power unit as shown in Figure 1 controls the steam cavity building process of the pressurizer, taking 30% of the maximum power of the heating component 90 as the loss, the temperature in the pressurizer is controlled to the set temperature, and the pressure in the pressurizer is controlled to the set pressure. The experimental result is that the total control time is 3300 s. For scenarios that require rapid steam cavity building, the total control time needs to be reduced. Therefore, in one embodiment, as shown in Figure 3 the pressurizer control device for a nuclear power unit further includes:

[0053] a second comparator 21, the first input terminal of the second comparator 21 is connected to the output terminal of the first comparator 20, and the output terminal of the second comparator 21 is connected to the PID controller 30;

[0054] a second transfer function operator 61, the input terminal of the second transfer function operator 61 is connected to the output terminal of the bias operator 50;

[0055] a third comparator 22, the first input terminal of the third comparator 22 is connected to the output terminal of the second transfer operator, and the output terminal of the third comparator 22 is connected to the second input terminal of the second comparator 21;

[0056] The second delay operator 71, the input end of the second delay operator 71 is connected to the output end of the second transfer function operator 61, and the output end of the second delay operator 71 is connected to the second input end of the third comparator 22.

[0057] The above-mentioned second comparator 21 is used to receive the output of the first comparator 20 and the output of the third comparator 22, and the above-mentioned third comparator 22 is used to receive the outputs of the second transfer function operator 61 and the second delay operator 71.

[0058] The above-mentioned second transfer function operator 61 is used to calculate the transfer function of the pressure regulating device of the nuclear power unit, and then determine the time required for heating. Among them, the transfer function is the ratio of the output to the input, that is, the ratio of the output temperature to the input temperature, and / or the ratio of the output pressure to the input pressure. In the second transfer function operator 61, the second input-output ratio corresponding to the pressure and / or temperature at different times in the pressure regulator is calculated based on the second transfer function, and then the heating time is determined.

[0059] Among them, the second transfer function is expressed by the following formula:

[0060] W s (s)=W0(s)(1 - e -τs )

[0061] In the formula, W s (s) represents the second ratio at time s, W0(s) represents the initial ratio at the initial time, the initial ratio is a constant, τ is a constant, and s represents the current time. The second transfer function is different from the first transfer function. By predicting the heating time through the second transfer function, the temperature response of the pressure regulator can be effectively predicted, thereby offsetting the influence of time delay and reducing the control time.

[0062] The above-mentioned second delay operator 71 is used to calculate the second target time for controlling the heating of the pressure regulator to the set pressure based on the second ratio obtained by the second transfer function operator 61. The PID controller 30 controls the heating component 90 to heat the pressure regulator through the non-linear saturation controller 40 based on the second target time, thereby realizing the automatic control of the steam cavity building process of the pressure regulator, improving the stability of the control process, and avoiding the situation that the power of the heating component 90 is too large, resulting in too high pressure in the pressure regulator, the failure of steam cavity building, and the situation that the power of the heating component 90 is too small, resulting in too long time for the pressure regulator to build the steam cavity and unable to achieve rapid steam cavity building.

[0063] Among them, when the current temperature is within the set temperature range, the PID controller 30 controls the heater to heat the pressure regulator through the non-linear saturation controller 40 based on the first target time and the second target time.

[0064] Further, through the pressurizer control device of the nuclear power unit as shown in Figure 3 , the pressurization chamber process of the pressurizer is controlled. Taking 30% of the maximum power of the heating assembly 90 as the loss, the temperature in the pressurizer is controlled to the set temperature, and the pressure in the pressurizer is controlled to the set pressure. The experimental result shows that the total control time is 926 s, effectively reducing the total control time.

[0065] In the embodiment of the present invention, the pressurizer control device of the nuclear power unit further includes a second comparator 21, the first input end of the second comparator 21 is connected to the output end of the first comparator 20, and the output end of the second comparator 21 is connected to the PID controller 30; a second transfer function calculator 61, the input end of the second transfer function calculator 61 is connected to the output end of the bias calculator 50; a third comparator 22, the first input end of the third comparator 22 is connected to the output end of the second transfer calculator, and the output end of the third comparator 22 is connected to the second input end of the second comparator 21; a second delay calculator 71, the input end of the second delay calculator 71 is connected to the output end of the second transfer function calculator 61, and the output end of the second delay calculator 71 is connected to the second input end of the third comparator 22. In this way, the pressurizer control device of the nuclear power unit calculates the first target time through the first transfer function calculator 60 and the first delay calculator 70, and calculates the second target time through the second transfer function calculator 61 and the second delay calculator 71, so that the PID controller 30 can control the power of the heating assembly 90 through the non-linear saturation controller 40 based on the first target time and the second target time, thereby effectively reducing the control time.

[0066] In one embodiment, the first input end and the second input end of the second comparator 21 are positive feedback input ends, the first input end of the third comparator 22 is a positive feedback input end, and the second input end of the third comparator 22 is a negative feedback input end.

[0067] It should be noted that the first input end of the second comparator 21 receives the output of the first comparator 20, the second input end receives the output of the third comparator 22, and the outputs of the first comparator 20 and the third comparator 22 are the same and are both connected as positive feedback to the second comparator 21 and input to the PID controller 30 by the second comparator 21 to achieve feedback control.

[0068] Meanwhile, the first input terminal of the third comparator 22 is connected to the output of the second transfer function calculator 61, and the second input terminal of the third comparator 22 is connected to the output of the second delay calculator 71. The larger the output of the second transfer function calculator 61 is, the longer the PID control time is. The input terminal of the third comparator 22 connected to the output of the second transfer function calculator 61 is the positive feedback input terminal. For the output of the second delay calculator 71, the longer the output second target time is, the higher the temperature rises. Negative feedback is required to maintain the temperature stability. That is, the input terminal of the third comparator 22 connected to the output of the second delay calculator 71 is the negative feedback input terminal.

[0069] In the embodiment of the present invention, the first input terminal and the second input terminal of the second comparator 21 are positive feedback input terminals, the first input terminal of the third comparator 22 is a positive feedback input terminal, and the second input terminal of the third comparator 22 is a negative feedback input terminal to realize the feedback control of the second transfer function calculator 61 and the second delay calculator 71 in the PID controller 30.

[0070] Further, the first input terminal of the first comparator 20 is connected to the output of the temperature sensor 10, and the first input terminal of the first comparator 20 is a positive feedback input terminal. The second input terminal of the first comparator 20 is connected to the output of the first delay calculator 70. Therefore, the second input terminal of the first comparator 20 is a negative feedback input terminal to realize the feedback control of the first transfer function calculator 60 and the first delay calculator 70 in the PID controller 30.

[0071] In one embodiment, the nuclear power plant pressurizer control device further includes:

[0072] A first oscilloscope 80, the first oscilloscope 80 is connected to the output terminal of the non-linear saturation controller 40, and the first oscilloscope 80 is used to display the power of the non-linear saturation controller 40 controlling the heating component 90 for heating.

[0073] In the embodiment of the present invention, the first oscilloscope 80 is used to display the power of the non-linear saturation controller 40 controlling the heating component 90 for heating to realize the monitoring of the heating power of the heating component 90 and facilitate timely adjustment in the case of abnormal heating power of the heating component 90.

[0074] In one embodiment, the nuclear power plant pressurizer control device further includes:

[0075] A second oscilloscope 81, the input terminal of the second oscilloscope 81 is connected to the output terminal of the temperature sensor 10, and the second oscilloscope 81 is used to display the real-time temperature of the pressurizer.

[0076] The above-mentioned second oscilloscope 81 is used to display the real-time temperature of the voltage regulator, so as to monitor the internal environment of the voltage regulator and facilitate timely adjustment in the case of abnormalities inside the voltage regulator (such as too high temperature).

[0077] The embodiment of the present application also relates to a voltage regulator. The voltage regulator has a hollow structure, and a heating component is provided inside the voltage regulator. The voltage regulator includes the above-mentioned nuclear power plant voltage regulator control device.

[0078] It should be noted that the implementation manner of the above-mentioned nuclear power plant voltage regulator control device embodiment is also applicable to the embodiment of this voltage regulator and can achieve the same technical effect, which will not be elaborated here.

[0079] It should be noted that in this article, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without more limitations, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including that element.

[0080] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific implementation manners. The above specific implementation manners are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the purpose of the present invention and the scope protected by the claims, and all belong to the protection scope of the present invention.

Claims

1. A pressure regulator control device for a nuclear power unit, characterized in that Comprising: A temperature sensor for monitoring the temperature of the voltage regulator; A first comparator, with the first input terminal of the first comparator connected to the temperature sensor; A proportional-integral-derivative (PID) controller, with the first input terminal of the PID controller connected to the output terminal of the first comparator; A non-linear saturation controller, with the input terminal of the non-linear saturation controller connected to the output terminal of the PID controller, and the output terminal of the non-linear saturation controller being used to connect to a heating component provided in the voltage regulator; An offset arithmetic unit, with the input terminal of the offset arithmetic unit connected to the output terminal of the non-linear saturation controller; A first transfer function arithmetic unit, with the input terminal of the first transfer function arithmetic unit connected to the output terminal of the offset arithmetic unit; A first delay arithmetic unit, with the input terminal of the first delay arithmetic unit connected to the output terminal of the first transfer function arithmetic unit, and the output terminal of the first delay arithmetic unit connected to the second input terminal of the first comparator.

2. The pressurizer control device of a nuclear power unit according to claim 1, characterized in that, Further comprising: A second comparator, with the first input terminal of the second comparator connected to the output terminal of the first comparator, and the output terminal of the second comparator connected to the PID controller; A second transfer function arithmetic unit, with the input terminal of the second transfer function arithmetic unit connected to the output terminal of the offset arithmetic unit; A third comparator, with the first input terminal of the third comparator connected to the output terminal of the second transfer arithmetic unit, and the output terminal of the third comparator connected to the second input terminal of the second comparator; A second delay arithmetic unit, with the input terminal of the second delay arithmetic unit connected to the output terminal of the second transfer function arithmetic unit, and the output terminal of the second delay arithmetic unit connected to the second input terminal of the third comparator.

3. The pressurizer control device of a nuclear power unit according to claim 2, characterized in that, The first input terminal and the second input terminal of the second comparator are positive feedback input terminals, the first input terminal of the third comparator is a positive feedback input terminal, and the second input terminal of the third comparator is a negative feedback input terminal.

4. The pressurizer control device of a nuclear power unit according to claim 1 or 2, characterized in that, The first input terminal of the first comparator is a positive feedback input terminal, and the second input terminal of the first comparator is a negative feedback input terminal.

5. The pressurizer control device of a nuclear power unit according to claim 1 or 2, characterized in that Further comprising: A first oscilloscope, with the first oscilloscope connected to the output terminal of the non-linear saturation controller, and the first oscilloscope being used to display the power of the heating component controlled by the non-linear saturation controller for heating.

6. The pressurizer control device of a nuclear power unit according to claim 1 or 2, characterized in that, Further comprising: A second oscilloscope, with the input terminal of the second oscilloscope connected to the output terminal of the temperature sensor, and the second oscilloscope being used to display the real-time temperature of the voltage regulator.

7. A voltage regulator, the voltage regulator being of a hollow structure, and a heating component being provided inside the voltage regulator, characterized in that, The voltage regulator comprises the nuclear power unit voltage regulator control device according to any one of claims 1 to 6.

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