Method and system for controlling charging flow rate of primary circuit stabilizer in nuclear power plant

Abstract

The present invention discloses a method and system for controlling the charging flow of a primary-loop pressurizer in a nuclear power plant. The method comprises: S1, obtaining a liquid level measurement value of a pressurizer; S2, performing a first PI regulation or a first PID regulation based on a first difference between a liquid level setting value of the pressurizer and a liquid level measurement value to generate a first control value; wherein, during the execution of the first PI regulation or the first PID regulation, output limit processing is performed on the integral item of the first PI regulation or the first PID regulation according to a charging flow limit range of the pressurizer; S3, performing liquid level control processing according to the first control value to generate a valve control instruction for controlling the charging flow of the pressurizer, and returning to S1; the implementation of the present invention can not only prevent the regulator from entering a saturated state, but also effectively improve the response speed, regulation accuracy and stability of the charging flow control system.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power plant pressurized water reactor control, and in particular to a method and system for controlling charging flow of a primary loop pressurizer of a nuclear power plant. Background Art

[0002] The pressurizer is an important device for the primary pressure regulation and overpressure protection of the pressurized water reactor in a nuclear power plant. If the liquid level of the pressurizer is too high, the volume of the pressurizer steam chamber will be too small, which will reduce its pressure regulation performance. If the liquid level of the pressurizer is too low, the electric heater may be exposed and burnt. Therefore, nuclear power plants need to limit the charging flow on the pressurizer. In related technologies, such as Figure 1 As shown, the technical solution for limiting the charging flow is to limit the output signal of the main regulator through a limit module, and this technical solution has the following defects: although the limit module can limit the charging flow, it also limits the algebraic sum of the output of the main regulator and the downstream flow. When the algebraic sum reaches the upper and lower limits of the limit module and continues to exceed the limit, the main regulator enters the integral saturation zone. If it enters the integral saturation zone, the response of the charging flow control system will be slowed down, the regulation process will be lengthened, and the regulation accuracy will be reduced, which will seriously affect the normal operation of the primary circuit of the nuclear power plant. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method and system for controlling the charging flow rate of a primary circuit regulator of a nuclear power plant in view of at least one defect of the prior art.

[0004] The technical solution adopted by the present invention to solve the technical problem is: constructing a method for controlling the charging flow rate of a primary circuit regulator of a nuclear power plant, comprising the following steps:

[0005] S1, obtaining the liquid level measurement value of the pressurizer;

[0006] S2. Performing a first PI adjustment or a first PID adjustment based on a first difference between the liquid level setting value of the pressure regulator and the liquid level measurement value to generate a first control value; wherein, during the execution of the first PI adjustment or the first PID adjustment, the integral term of the first PI adjustment or the first PID adjustment is output limited according to the charging flow limit range of the pressure regulator;

[0007] S3. Perform liquid level control processing according to the first control value to generate a valve control instruction for controlling the charging flow of the regulator, and return to S1.

[0008] Preferably, in S2, the output limit processing of the integral term in the first PI regulation or the first PID regulation according to the charging flow limit range of the voltage regulator includes:

[0009] The measured value of the downstream flow of the voltage regulator is obtained, and the output upper limit value and the output lower limit value of the integral term are set according to the proportional term in the first PI regulation or the first PID regulation, the downstream flow and the charging flow limit range.

[0010] Preferably, in S2, the expression of the output upper limit value of the integral term is:

[0011] Th=HK p1 e(t)-d1;

[0012] Wherein, Th is the output upper limit value of the integral term, H is the upper limit value of the charging flow limit range, K p1 is the proportionality coefficient, e(t) is the first difference, and d1 is the measured value of the downstream flow rate;

[0013] The expression of the output lower limit of the integral term is:

[0014] Tl=LK p1 e(t)-d1;

[0015] Wherein, T1 is the output upper limit value of the integral term, and L is the lower limit value of the upper charging flow limit range.

[0016] Preferably, in S3, performing liquid level control processing according to the first control value includes:

[0017] The charging flow measurement value of the regulator is obtained, and a second PID adjustment is performed on the value obtained by adding the discharge flow measurement value to the first control value and subtracting the charging flow measurement value to generate the valve control instruction.

[0018] Preferably, the charging flow limit range is 6m 3 / h to 25.6m 3 / h.

[0019] The present invention also constructs a charging flow control system for a primary circuit stabilizer of a nuclear power plant, comprising:

[0020] A liquid level acquisition unit, used to acquire the liquid level measurement value of the pressurizer;

[0021] a first operation unit connected to the liquid level acquisition unit, and configured to perform a first PI adjustment or a first PID adjustment on a first difference between a liquid level setting value of the pressure regulator and the liquid level measurement value, so as to generate a first control value;

[0022] a limit processing unit connected to the first operation unit, and configured to perform output limit processing on the integral term of the first PI regulation or the first PID regulation according to the charging flow limit range of the voltage regulator during the execution of the first PI regulation or the first PID regulation;

[0023] The second operation unit is connected to the first operation unit and is used to perform liquid level control processing on the first control value to generate a valve control instruction for controlling the charging flow of the regulator.

[0024] Preferably, the first operation unit comprises a first subtractor for calculating the first difference between the liquid level set value and the liquid level measurement value;

[0025] The first operation unit further includes a PI regulator for performing the first PI regulation on the first difference or a PID regulator for performing the first PID regulation on the first difference.

[0026] Preferably, the charging flow control system of the primary circuit pressurizer of the nuclear power plant further comprises a discharge flow acquisition unit for acquiring the discharge flow measurement value of the pressurizer;

[0027] The limit processing unit includes a second subtractor and a third subtractor; the minuend input end of the second subtractor is used to obtain the upper limit value of the upper charging flow limit range, the first subtrahend input end of the second subtractor is used to obtain the product of the proportional coefficient in the PI regulator or the PID regulator and the first difference, the second subtrahend input end of the second subtractor is connected to the downstream flow acquisition unit to obtain the downstream flow measurement, and the output end of the second subtractor is connected to the integral item output upper limit value setting end in the PI regulator or the PID regulator;

[0028] The minuend input end of the third subtractor is used to obtain the lower limit value of the upper charging flow limit range, the first minuend input end of the third subtractor is used to obtain the product of the proportional coefficient in the PI regulator or the PID regulator and the first difference, the second minuend input end of the third subtractor is connected to the downstream flow acquisition unit to obtain the downstream flow measurement, and the output end of the third subtractor is connected to the integral item output lower limit value setting end in the PI regulator or the PID regulator.

[0029] Preferably, the charging flow control system of the primary circuit pressurizer of the nuclear power plant further comprises a charging flow acquisition unit for acquiring the charging flow measurement value of the pressurizer;

[0030] The second operation unit includes an adder, a fourth subtractor and a first PID regulator; the first input end of the adder is connected to the first operation unit to receive the first control value, the second input end of the adder is connected to the downstream flow acquisition unit to receive the downstream flow measurement value, the output end of the adder is connected to the minuend input end of the fourth subtractor, the subtrahend input end of the fourth subtractor is connected to the upper charging flow acquisition unit to receive the upper charging flow measurement value, and the output end of the fourth subtractor is connected to the first PID regulator;

[0031] The first PID regulator is used to perform a second PID regulation on the output value of the fourth subtractor to generate the valve control instruction.

[0032] Preferably, the charging flow control system of the primary-loop pressurizer of the nuclear power plant also includes a charging flow regulating valve; the charging flow regulating valve is connected to the second operating unit to receive the valve control instruction, and then controls the charging flow of the pressurizer according to the valve control instruction.

[0033] The present invention has at least the following beneficial effects: providing a method for controlling the charging flow of a primary-loop pressurizer of a nuclear power plant; performing a first PI adjustment or a first PID adjustment based on a first difference between a liquid level setting value and a liquid level measurement value of the pressurizer, and in the process of executing the first PI adjustment or the first PID adjustment, performing output limit processing on the integral term of the first PI adjustment or the first PID adjustment according to the charging flow limit range of the pressurizer, thereby limiting the first control value output after the first PI adjustment or the first PID adjustment; then performing liquid level control processing according to the first control value, and generating a valve control instruction for controlling the charging flow of the pressurizer; the implementation of the present invention can not only prevent the regulator from entering a saturated state, but also effectively improve the response speed, regulation accuracy and stability of the charging flow control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0035] Figure 1 It is a structural schematic diagram of a charging flow control system in the related art;

[0036] Figure 2 It is a flow chart of a method for controlling charging flow rate of a primary circuit regulator of a nuclear power plant provided by the present invention;

[0037] Figure 3 It is a structural schematic diagram of a first embodiment of a charging flow control system for a primary circuit pressurizer of a nuclear power plant provided by the present invention;

[0038] Figure 4It is a structural schematic diagram of a second embodiment of a charge flow control system for a primary circuit pressurizer of a nuclear power plant provided by the present invention;

[0039] Figure 5 The invention provides a schematic diagram of the structure of a limit value processing unit and a PI / PID regulator in a charging flow control system of a primary circuit voltage stabilizer of a nuclear power plant. DETAILED DESCRIPTION

[0040] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0041] It should be noted that the flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor do they have to be executed in the order described. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0042] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0043] refer to Figure 2 The present invention provides a method for controlling the charging flow rate of a primary circuit regulator of a nuclear power plant, which is applicable to a charging flow rate control system of a primary circuit regulator of a nuclear power plant. The method comprises step S1, step S2 and step S3.

[0044] Step S1 includes: obtaining a liquid level measurement value of the pressurizer.

[0045] Step S2 includes: performing a first PI adjustment or a first PID adjustment based on a first difference between a liquid level setting value of the pressure regulator and a liquid level measurement value to generate a first control value; wherein, during the execution of the first PI adjustment or the first PID adjustment, the integral item of the first PI adjustment or the first PID adjustment is output limited according to the charging flow limit range of the pressure regulator.

[0046] Specifically, the liquid level setting value of the pressurizer can be set by the staff, or be a calculated value given by a loop control system; and the purpose of output limit processing of the integral item of the first PI regulation or the first PID regulation is: to limit the output data of the integral item of the first PI regulation or the first PID regulation in advance so that the output data of the integral item is within the set range, so that the valve control instruction generated after the subsequent execution of step S3 will not cause the liquid level of the pressurizer to exceed the required range of the nuclear power plant.

[0047] In some embodiments, the step S2 of performing output limit processing on the integral term in the first PI regulation or the first PID regulation according to the upper charging flow limit range of the regulator includes: obtaining the downstream flow measurement value of the regulator, setting the output upper limit value and the output lower limit value of the integral term according to the proportional term, the downstream flow and the upper charging flow limit range in the first PI regulation or the first PID regulation, so as to control the output range of the first control value, and then control the valve control instruction to be within the set range. Optionally, the upper charging flow limit range is 6m 3 / h to 25.6m 3 / h.

[0048] Specifically, in order to eliminate the influence of the downstream flow of the voltage stabilizer on the valve control instruction, it is necessary to compensate the first control value (which is part of the technical content of step S3), that is, the first control value needs to be added with the downstream flow measurement value to offset the influence of the downstream flow. Correspondingly, when performing output limit processing, the output limit range of the integral term in the first PI regulation or the first PID regulation should also be compensated accordingly, as follows: L<u1(t)+d1<H(1); wherein d1 is the downstream flow measurement value, L is the lower limit of the charging flow limit range, and H is the upper limit of the charging flow limit range.

[0049] Taking the first PI regulation as an example, its regulation operation expression is: (2); where T i is the integration time constant, u(t) is the output signal after the first PID adjustment, and e(t) is the first difference.

[0050] Substituting equation (2) into equation (1), we can obtain that the integral term value range of the first PI regulation should satisfy: in, The corresponding integral term.

[0051] From formula (3), we can get the output upper limit of the integral term Th = HK p1 e(t)-d1(4); output lower limit value of integral term Tl=LK p1 e(t)-d1(5).

[0052] It can be understood that from equations (4) and (5), the integral term output limit and the proportional term (K p1e(t)), the lower limit value (L) of the charging flow limit range, the upper limit value (H) of the charging flow limit range and the downstream flow measurement value (d1), and in some embodiments, the downstream flow, the lower limit value of the charging flow limit range and the upper limit value of the charging flow limit range are fixed values. Therefore, the integral item output limit generally changes with the proportional term, so that the integral item output limit setting has good real-time performance, which not only effectively avoids the integral item saturation in PI regulation or PID regulation, but also improves the response time, regulation accuracy and stability of the charging flow control system.

[0053] Step S3 includes: performing liquid level control processing according to the first control value to generate a valve control instruction for controlling the charging flow of the regulator, and returning to step S1. Specifically, the valve control instruction is used to control the opening of the charging flow regulating valve, thereby controlling the charging flow of the regulator.

[0054] In some embodiments, the liquid level control processing according to the first control value in step S3 includes: obtaining the upper filling flow measurement value of the regulator, performing a second PID adjustment on the value obtained by adding the lower discharge flow measurement value to the first control value and subtracting the upper filling flow measurement value to generate a valve control instruction; returning to step S1 to repeat steps S1 to S3 so that the liquid level of the regulator is gradually adjusted to the liquid level set value.

[0055] It should be noted that the first control value plus the downstream flow measurement value is to compensate for the consumption of the downstream flow, and the compensated first control value minus the upstream flow measurement value is to prepare for the second PID adjustment; it is understandable that the output limit processing performed is mainly to limit the first control value, and limiting the first control value is equivalent to limiting the valve control instruction, that is, to limit the opening of the upstream flow control valve, thereby ensuring that the regulator has a good adjustment margin and preventing the heater in a circuit from being exposed and burned due to the low liquid level of the regulator.

[0056] refer to Figure 3 The present invention also provides a charging flow control system for a primary circuit regulator of a nuclear power plant, comprising: a liquid level acquisition unit 1, a first operation unit 2, a limit value processing unit 3 and a second operation unit 4.

[0057] The liquid level acquisition unit 1 is used to acquire the liquid level measurement value of the stabilizer.

[0058] The first operation unit 2 is connected to the liquid level acquisition unit 1, and is used to perform a first PI adjustment or a first PID adjustment on a first difference between a liquid level setting value of the pressure regulator and a liquid level measurement value, so as to generate a first control value.

[0059] The limit processing unit 3 is connected to the first operation unit 2, and is used to perform output limit processing on the integral term of the first PI regulation or the first PID regulation according to the upper charging flow limit range of the regulator during the execution of the first PI regulation or the first PID regulation.

[0060] The second operation unit 4 is connected to the first operation unit 2 and is used for performing liquid level control processing on the first control value to generate a valve control instruction for controlling the charging flow of the voltage stabilizer.

[0061] In some embodiments, Figure 4 As shown, the first operation unit 2 includes a first subtractor 21 for calculating a first difference between a liquid level setting value and a liquid level measurement value; the first operation unit 2 also includes a PI regulator for performing a first PI regulation on the first difference or a PID regulator for performing a first PID regulation on the first difference.

[0062] In some embodiments, Figure 4 As shown, the charging flow control system of the primary circuit pressurizer of the nuclear power plant also includes a discharge flow acquisition unit 6 for collecting the discharge flow measurement value of the pressurizer; Figure 5 As shown, the limit processing unit 3 includes a second subtractor 31 and a third subtractor 32;

[0063] Specifically, the minuend input terminal of the second subtractor 31 is used to obtain the upper limit value of the charging flow limit range, the first subtrahend input terminal of the second subtractor 31 is used to obtain the product of the proportional coefficient and the first difference in the PI regulator or the PID regulator, the second subtrahend input terminal of the second subtractor 31 is connected to the downstream flow acquisition unit 6 to obtain the downstream flow measurement, and the output terminal of the second subtractor 31 is connected to the integral item output upper limit value setting terminal in the PI regulator or the PID regulator;

[0064] The minuend input terminal of the third subtractor 32 is used to obtain the lower limit value of the upper charging flow limit range, the first minuend input terminal of the third subtractor 32 is used to obtain the product of the proportional coefficient and the first difference in the PI regulator or the PID regulator, the second minuend input terminal of the third subtractor 32 is connected to the downstream flow acquisition unit 6 to obtain the downstream flow measurement, and the output terminal of the third subtractor 32 is connected to the integral item output lower limit value setting terminal in the PI regulator or the PID regulator.

[0065] In some embodiments, the charging flow control system of the primary circuit pressurizer of the nuclear power plant further comprises a charging flow acquisition unit 7 for acquiring the charging flow measurement value of the pressurizer;

[0066] The second operation unit 4 includes an adder 41, a fourth subtractor 42 and a first PID regulator; the first input end of the adder 41 is connected to the first operation unit 2 to receive the first control value, the second input end of the adder 41 is connected to the downstream flow acquisition unit 6 to receive the downstream flow measurement value, the output end of the adder 41 is connected to the minuend input end of the fourth subtractor 42, the subtrahend input end of the fourth subtractor 42 is connected to the charging flow acquisition unit 7 to receive the charging flow measurement value, and the output end of the fourth subtractor 42 is connected to the first PID regulator; the first PID regulator is used to perform a second PID adjustment on the output value of the fourth subtractor 42 to generate a valve control instruction.

[0067] In some embodiments, Figure 3 or Figure 4 As shown, the charging flow control system of the primary circuit pressurizer of the nuclear power plant also includes a charging flow regulating valve 5; the charging flow regulating valve 5 is connected to the second operation unit 4 to receive the valve control instruction, and then controls the charging flow of the pressurizer according to the valve control instruction.

[0068] refer to Figure 4 The working principle of the charging flow control system of the primary circuit pressurizer of a nuclear power plant is as follows: first, the liquid level set value and the liquid level measurement value are subtracted to obtain a first difference, and then the first difference is subjected to a first PI adjustment or a first PID adjustment through a first PI regulator or a first PID regulator to obtain a first control value; and in the process of PI adjustment or PID adjustment, the output value of the integral term is limited so that the output of the first control value is within a set range; then, the first control value is subjected to downstream flow compensation, and then the difference is subjected to a second PID adjustment to obtain a valve control instruction; the charging flow regulating valve 5 controls its opening stroke based on the valve control instruction, thereby realizing the function of controlling the charging flow of the pressurizer.

[0069] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0070] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0071] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present invention, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the coverage of the claims of the present invention.

Claims

1. A method for controlling the charging flow rate of a primary circuit regulator of a nuclear power plant, characterized in that: The following steps are involved: S1, obtaining the liquid level measurement value of the pressurizer; S2. Performing a first PI adjustment or a first PID adjustment based on a first difference between the liquid level setting value of the pressure regulator and the liquid level measurement value to generate a first control value; wherein, during the execution of the first PI adjustment or the first PID adjustment, the integral term of the first PI adjustment or the first PID adjustment is output limited according to the charging flow limit range of the pressure regulator; S3, performing liquid level control processing according to the first control value to generate a valve control instruction for controlling the charging flow of the regulator, and returning to S1; In S2, the output limit processing of the integral term in the first PI regulation or the first PID regulation according to the charging flow limit range of the regulator includes: Obtaining a measured value of the downstream flow rate of the voltage regulator, and setting an output upper limit value and an output lower limit value of the integral term according to a proportional term in the first PI regulation or the first PID regulation, the downstream flow rate, and a limit range of the upstream flow rate; The expression of the output upper limit value of the integral term is: Th=H-K p1 e(t)-d1; Wherein, Th is the output upper limit value of the integral term, H is the upper limit value of the charging flow limit range, K p1 is the proportionality coefficient, e(t) is the first difference, and d1 is the measured value of the downstream flow rate; The expression of the output lower limit of the integral term is: Tl=LK p1 e(t)-d1: Wherein, T1 is the output upper limit value of the integral term, and L is the lower limit value of the upper charging flow limit range.

2. The method for controlling the charging flow rate of a primary circuit regulator of a nuclear power plant according to claim 1, characterized in that: In S3, performing liquid level control processing according to the first control value includes: The charging flow measurement value of the regulator is obtained, and a second PID adjustment is performed on the value obtained by adding the discharge flow measurement value to the first control value and subtracting the charging flow measurement value to generate the valve control instruction.

3. The method for controlling the charging flow rate of a primary circuit regulator of a nuclear power plant according to claim 2, characterized in that: The charging flow limit range is 6m 3 / h to 25.6m 3 / h.

4. A charging flow control system for a primary circuit regulator of a nuclear power plant, characterized in that: include: A liquid level acquisition unit (1), used for acquiring a liquid level measurement value of the pressure stabilizer; A first operation unit (2) is connected to the liquid level acquisition unit (1) and is used to perform a first PI adjustment or a first PID adjustment on a first difference between a liquid level setting value of the pressure regulator and the liquid level measurement value, so as to generate a first control value; wherein the first operation unit (2) comprises a first subtractor (21) for calculating the first difference between the liquid level setting value and the liquid level measurement value, and the first operation unit (2) also comprises a PI regulator for performing the first PI adjustment on the first difference or a PID regulator for performing the first PID adjustment; a limit value processing unit (3), connected to the first operation unit (2), and used for performing output limit value processing on the integral term of the first PI regulation or the first PID regulation according to the charging flow limit range of the voltage stabilizer during the execution of the first PI regulation or the first PID regulation; a second operation unit (4), connected to the first operation unit (2), and used for performing liquid level control processing on the first control value to generate a valve control instruction for controlling the charging flow of the voltage stabilizer; A downstream flow rate collection unit (6) for collecting the downstream flow rate measurement value of the stabilizer; The limit value processing unit (3) comprises a second subtractor (31) and a third subtractor (32); the minuend input end of the second subtractor (31) is used to obtain the upper limit value of the upper charging flow limit range, the first subtrahend input end of the second subtractor (31) is used to obtain the product of the proportional coefficient in the PI regulator or the PID regulator and the first difference value, the second subtrahend input end of the second subtractor (31) is connected to the downstream flow acquisition unit (6) to obtain the downstream flow measurement, and the output end of the second subtractor (31) is connected to the integral item output upper limit value setting end in the PI regulator or the PID regulator; The minuend input end of the third subtractor (32) is used to obtain the lower limit value of the upper charging flow limit range, the first minuend input end of the third subtractor (32) is used to obtain the product of the proportional coefficient in the PI regulator or the PID regulator and the first difference value, the second minuend input end of the third subtractor (32) is connected to the downstream flow acquisition unit (6) to obtain the downstream flow measurement, and the output end of the third subtractor (32) is connected to the integral item output lower limit value setting end in the PI regulator or the PID regulator.

5. The charging flow control system for the primary circuit stabilizer of a nuclear power plant according to claim 4, characterized in that: It also includes a charging flow acquisition unit (7) for acquiring a charging flow measurement value of the voltage stabilizer; The second operation unit (4) comprises an adder (41), a fourth subtractor (42) and a first PID regulator; a first input end of the adder (41) is connected to the first operation unit (2) to receive the first control value, a second input end of the adder (41) is connected to the downstream flow acquisition unit (6) to receive the downstream flow measurement value, an output end of the adder (41) is connected to the minuend input end of the fourth subtractor (42), a subtrahend input end of the fourth subtractor (42) is connected to the upstream flow acquisition unit (7) to receive the upstream flow measurement value, and an output end of the fourth subtractor (42) is connected to the first PID regulator; The first PID regulator is used to perform a second PID regulation on the output value of the fourth subtractor (42) to generate the valve control instruction.

6. The charging flow control system for the primary circuit stabilizer of a nuclear power plant according to claim 4, characterized in that: It also includes a charging flow regulating valve (5); the charging flow regulating valve (5) is connected to the second computing unit (4) to receive the valve control instruction, and then controls the charging flow of the voltage stabilizer according to the valve control instruction.

Images