Stable working condition reactor, machine and heat coordination control system and method under multi-module high-temperature gas cooled reactor cogeneration working condition

Abstract

The invention relates to the field of nuclear power control, in particular to a steady-state working condition reactor, machine and heat coordination control system and method under a multi-module high-temperature gas cooled reactor cogeneration working condition. The coordinated control system comprises a heat supply island control module, a steam turbine control module, a unit power set value module, a power distribution module, an NSSS module control system module, a main steam pressure control module and a water supply pressure control module. The coordination control method comprises coordination control under the condition that the power grid assessment limit is not considered and under the condition that the power grid assessment limit is considered. Coupling of control among the reactor, the steam turbine and heat supply is avoided, on the premise that nuclear safety and stable operation of the NSSS module are guaranteed, the heat supply requirement is met preferentially, residual heat power is used for power generation, and safe, stable and reliable operation of the whole heat supply system is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power control, and in particular to a reactor, machine and heat coordinated control system and method under steady-state conditions of a multi-module high-temperature gas-cooled reactor cogeneration condition. Background Art

[0002] As a clean, efficient and stable energy source, nuclear energy is an important means to achieve the goal of "carbon peak and carbon neutrality" and has unique advantages in reducing coal consumption and greenhouse gas emissions. At present, the application of nuclear energy in the field of power generation is relatively mature, mainly in pressurized water reactor nuclear power plants. However, due to the low main steam temperature and pressure parameters of pressurized water reactor nuclear power plants, the field of nuclear energy heating is limited.

[0003] The commercial operation of high-temperature gas-cooled reactor units provides a wider space for the expansion of nuclear energy applications. High-temperature gas-cooled reactors are internationally recognized as the fourth-generation advanced nuclear power technology, with inherent safety. In the event of loss of all cooling capacity, even without any intervention measures, the reactor can still maintain a safe state and produce steam with higher parameters. It has broad scenarios in power generation, cogeneration, high-temperature heating and other fields.

[0004] In view of the relatively high current construction cost of high-temperature gas-cooled reactors, taking into account the economic benefits, it is possible to couple high-temperature gas-cooled reactors and pressurized water reactors, two reactor units with independent intellectual property rights, for cogeneration of heat and power, producing steam with various parameters to provide heat for industrial enterprises such as the chemical industry.

[0005] The process flow diagram of the heating system is as follows: Figure 1 , an independent three-circuit heating system is set up, and the main steam of the second circuit of the Hualong One pressurized water reactor unit 2 is used to heat the three-circuit heating steam feed water 3 through the saturated evaporative heat exchanger 4, and then the high-temperature and high-pressure steam of the second circuit of the high-temperature gas-cooled reactor unit 1 is used to superheat the saturated industrial steam through the superheat heat exchanger 5, and finally the external steam 6 that meets the requirements is delivered to the heat users.

[0006] The high temperature gas-cooled reactor currently in commercial operation is a pure condensing power generation unit that uses a typical dual-module high temperature gas-cooled reactor. See the process flow diagram for details. Figure 2 The high temperature gas-cooled reactor module is mainly composed of a reactor and a steam generator, also known as a nuclear steam supply system module (hereinafter referred to as NSSS module). The No. 1 NSSS module 7 and the No. 2 NSSS module 8 can be operated as a single NSSS module, or two NSSS modules can be operated simultaneously. The steam generated by the NSSS module enters the steam turbine generator set 10 through the main steam regulating valve 9 to generate electricity.

[0007] The pure condensing power generation unit of the high temperature gas-cooled reactor adopts the "machine-follows-reactor" operation mode under steady-state conditions, that is, the reactor operates in a set load mode, and the steam turbine tracks the changes in the reactor output thermal power by controlling the main steam header pressure. The control principle diagram is shown in Figure 3 The operator manually sets the unit power set value through the unit power set value module 13 according to the grid load set value 11 and the generator power measured value 12. The power distribution module 14 automatically allocates the reactor output thermal power set value of each NSSS module according to the preset strategy based on the status of the two NSSS modules. The No. 1 NSSS module control module 15 makes the No. 1 NSSS module output thermal power 17 reach and maintain the set value through the coordinated control system in the No. 1 NSSS module 7 according to its own reactor output thermal power set value; the No. 2 NSSS module control module 16 makes the No. 2 NSSS module output thermal power 18 reach and maintain the set value through the coordinated control system in the No. 2 NSSS module 8 according to its own reactor output thermal power set value. The turbine control module 21 controls the main steam regulating valve 9 to keep the pressure of the main steam header at the set value according to the deviation between the main steam pressure set value 19 and the main steam pressure measured value 20, and the turbine power generation tracks the change.

[0008] After the heating load is increased, NSSS modules are added according to the heating demand, and heating pipelines are added to the secondary circuit. See the process of the multi-module high-temperature gas-cooled reactor unit for cogeneration. Figure 4 Multiple NSSS modules can be operated individually or in combination. A portion of the steam generated by each NSSS module enters the steam turbine generator set through the main steam regulating valve 9 to generate electricity, and a portion enters the heating island through the heating regulating valve 26 and is used to heat the saturated steam to a set temperature through the superheater heat exchanger 5.

[0009] After the heating load is increased, the original coordinated control mode between the reactor and the steam turbine changes to the coordinated control of the reactor, the turbine, and the heat. Under steady-state conditions, it is necessary to coordinate the control of the steam turbine and multiple NSSS modules to respond to fluctuations and adjustments in the heating load, which poses a risk of coupled control. Summary of the invention

[0010] The technical problem to be solved by the present invention is: to provide a method for coordinated control of reactor, machine and heat under steady-state conditions under cogeneration conditions of a multi-module high-temperature gas-cooled reactor, so as to avoid coupling of control among the reactor, steam turbine and heating, and to give priority to meeting the heating demand under the premise of ensuring nuclear safety and stable operation of the NSSS module, and to use the remaining thermal power for power generation, thereby ensuring safe, stable and reliable operation of the entire heating system.

[0011] The present invention provides a reactor, machine and heat coordinated control system under steady-state conditions of a multi-module high-temperature gas-cooled reactor cogeneration, comprising:

[0012] The heating island control module collects the measurement parameters of the heating-related process and sets the set value of the external steam temperature. According to the difference between the set value of the external steam temperature and the measured value of the heating steam temperature, the heating regulating valve is controlled through the PID control algorithm to maintain the external steam temperature at the set value. The total thermal power output of the reactor is about to be adjusted from the unit power setting value module, and the adjustment of the heating regulating valve is stopped to ensure that only the reactor and the machine are adjusted at the same time, avoiding the simultaneous adjustment of the reactor, the machine and the heat. The heating load of the secondary circuit is calculated and output to the unit power setting value module for calculating the unit power setting value.

[0013] The steam turbine control module collects measurement signals of relevant process parameters of the steam turbine, receives the main steam pressure measurement signal from the main steam pressure control module, and participates in the main steam pressure control; manually sets the allowable limit of fluctuation of measurement signals of relevant process parameters of the steam turbine, which is used for power generation control of the steam turbine and participation in the main steam pressure control; when the steam turbine is in pressure mode, the main steam regulating valve is controlled through the PID algorithm, and the main steam pressure is maintained at the set value according to the deviation between the main steam pressure measurement signal and the main steam pressure set value; when the heating load fluctuates greatly and the power generation exceeds the allowable limit of power generation fluctuation, the power generation exceeds the limit. The part of the rate setting value is sent as a feedforward signal to the unit power setting value module to adjust the total thermal power output of the reactor and realize the automatic control of the reactor, the machine and the heat; when the steam turbine is in the load mode, according to the deviation between the power generation setting value and the power generation measurement signal, the power generation is controlled at the setting value through the PID algorithm. At this time, the main steam pressure is controlled by the main steam pressure control module to adjust the bypass valve group; the steam turbine control mode is output to the main steam pressure control module for the main steam pressure control conversion; the power generation measurement value is output to the unit power setting value module to participate in the calculation of the unit power setting value;

[0014] The unit power setting value module calculates the reactor output total thermal power constant value according to the secondary circuit heating load transmitted by the heating island control system module and the turbine power generation measurement value of the turbine control module; manually sets the reactor output total thermal power constant value; receives the difference between the power generation power of the turbine control module and the allowable limit as the feedforward signal of the reactor output total thermal power, which is used to adjust the reactor output total thermal power, and at the same time sends the reactor output total thermal power adjustment signal to the heating island control module, which is used to stop the adjustment of the heating regulating valve; outputs the reactor output total thermal power signal to the feed water pressure control module to participate in the feed water pressure control;

[0015] The power allocation module receives the reactor thermal power output of each NSSS module control system module, and is used to calculate the current reactor output total thermal rate; according to the preset power allocation strategy, the deviation between the set value of the reactor output total thermal power transmitted by the unit power setting value module and the current reactor output total thermal power is allocated to the control system modules of all or part of the NSSS modules that have been put into automatic mode, so as to adjust the reactor output thermal power of the corresponding NSSS modules;

[0016] NSSS module control system module, manually set the NSSS module reactor output thermal power set value or receive the reactor output thermal power set value from the power distribution module; collect the process parameter measurement values ​​of the NSSS module, calculate the reactor output thermal power, control the main helium fan, feed water regulating valve and control rod to control the reactor output thermal power to maintain at the set value; output the calculated value of the NSSS module reactor output thermal power and the status signal of the NSSS module to the power distribution module, and participate in the calculation of the total reactor output thermal power;

[0017] The main steam pressure control module collects the main steam main pipe pressure measurement signal; receives the turbine control mode status signal from the turbine control module, and is used to switch to the main steam pressure control mode; when receiving the signal that the turbine is in load control mode, it automatically controls the switch to the bypass valve to control the main steam pressure;

[0018] The feed water pressure control module collects the feed water main pipe pressure measurement signal and controls the feed water pressure at a given value; it receives the reactor output total thermal power setting value signal from the unit power setting value module as a feedforward signal for feed water pressure control.

[0019] In a specific embodiment of the present invention, the heat supply related process measurement parameters include the heat supply steam temperature or the heat supply steam flow rate.

[0020] In a specific embodiment of the present invention, the turbine-related process parameter measurement signal includes a turbine regulating stage pressure, a turbine speed or a generated power.

[0021] In a specific embodiment of the present invention, the NSSS module control system module is provided with multiple NSSS modules, and the NSSS modules operate independently or simultaneously.

[0022] In a specific embodiment of the present invention, the process parameter measurement values ​​of the NSSS module include one or more of reactor power, main steam temperature, feed water flow rate and control rod position.

[0023] The present invention also provides a method for coordinated control of reactor, machine and heat in a steady-state condition under a multi-module high-temperature gas-cooled reactor cogeneration condition, which includes the following steps without considering the grid assessment restrictions:

[0024] When the heating load changes, the heating island control module adjusts the heating regulating valve through the PID control algorithm according to the deviation between the input heating steam temperature set value and the heating steam temperature measurement value;

[0025] The steam turbine control module controls and adjusts the main steam regulating valve according to the deviation between the input main steam pressure measurement value and the main steam pressure set value, so as to maintain the pressure of the main steam header at the set value;

[0026] Considering the grid assessment restrictions, the following steps are included:

[0027] When the heating load changes, the heating island control module adjusts the heating regulating valve through the PID control algorithm according to the deviation between the input heating steam temperature set value and the heating steam temperature measurement value;

[0028] The steam turbine control module controls and adjusts the main steam regulating valve according to the deviation between the input main steam pressure measurement value and the main steam pressure set value, so as to maintain the pressure of the main steam header at the set value;

[0029] The actual power generation in the steam turbine control module is compared with the set load of the power grid. If the deviation does not reach 80% of the allowable fluctuation limit of the power grid, the fluctuation of the heating load will continue to be absorbed by the change of the steam turbine power.

[0030] If the deviation reaches 80% of the allowable fluctuation limit of the power grid, the part of the electric power that exceeds the allowable limit of the power grid will be sent to the unit power setting value module as the reactor output total thermal power target value feedforward for adjustment, changing the unit power setting value, and modifying the reactor output thermal power set value of some NSSS modules through the power allocation module according to the preset allocation strategy. The corresponding NSSS module control system module adjusts the reactor power to achieve the change of the output reactor output total thermal power to absorb the continued change of the heating load until the heating load reaches the target value.

[0031] In a specific embodiment of the present invention, the calculation method of the part of the electric power that exceeds the allowable limit of the power grid is:

[0032] The portion of electric power that exceeds the permitted limit of the power grid = actual generator power - set power generation power × (1 + permitted limit of the power grid × 80%).

[0033] In a specific embodiment of the present invention, the change in heating load includes a decrease or increase in heating load.

[0034] In a specific embodiment of the present invention, when the heating load is reduced, without considering the grid assessment restrictions, the following steps are included:

[0035] The heating load is reduced, the steam flow through the superheater heat exchanger is reduced, the temperature of the external steam is increased, and the deviation between the heating steam temperature setting value and the heating steam temperature measurement value is increased;

[0036] The PID controller in the heating island control module adjusts and closes the heating regulating valve according to the deviation between the input heating steam temperature set value and the heating steam temperature measurement value;

[0037] The heating regulating valve is closed, which causes the pressure of the main steam header to increase, and the deviation between the main steam pressure measurement value and the main steam pressure setting value increases;

[0038] In the steam turbine control mode of the steam turbine control module, in the pressure control mode, the PID controller controls and adjusts the main steam regulating valve according to the deviation between the input main steam pressure measurement value and the main steam pressure set value, so as to maintain the pressure of the main steam header at the set value;

[0039] The main steam regulating valve is opened wider, the main steam entering the steam turbine increases, and the power generation increases;

[0040] Considering the grid assessment restrictions, the following steps are included:

[0041] The heating load is reduced, the steam flow through the superheater heat exchanger is reduced, the temperature of the external steam is increased, and the deviation between the heating steam temperature setting value and the heating steam temperature measurement value is increased;

[0042] The PID controller in the heating island control module adjusts and closes the heating regulating valve according to the deviation between the input heating steam temperature set value and the heating steam temperature measurement value;

[0043] The heating regulating valve is closed, which causes the pressure of the main steam header to increase, and the deviation between the main steam pressure measurement value and the main steam pressure setting value increases;

[0044] In the steam turbine control mode of the steam turbine control module, in the pressure control mode, the PID controller controls and adjusts the main steam regulating valve according to the deviation between the input main steam pressure measurement value and the main steam pressure set value, so as to maintain the pressure of the main steam header at the set value;

[0045] The main steam regulating valve is opened wider, the main steam entering the steam turbine increases, and the power generation increases;

[0046] The actual power generation in the steam turbine control module is compared with the set load of the power grid. If the deviation does not reach 80% of the upper limit of the fluctuation allowed by the power grid, the fluctuation of the heating load will continue to be absorbed by the change of the steam turbine power.

[0047] If the deviation reaches 80% of the upper limit of the grid's allowable fluctuation, the part of the electric power that exceeds the grid's allowable limit will be sent to the unit power setting value module as the reactor output total thermal power target value feedforward for adjustment, changing the unit power setting value, and modifying the reactor output thermal power set value of some NSSS modules through the power allocation module according to the preset allocation strategy. The corresponding NSSS module control system module reduces the reactor power, so as to reduce the output of the reactor output total thermal power to absorb the continued reduction in the heating load until the heating load reaches the target value.

[0048] In a specific embodiment of the present invention, when the heating load increases, without considering the grid assessment restrictions, the following steps are included:

[0049] As the heating load increases, the steam flow rate through the superheater heat exchanger increases, the temperature of the external steam decreases, and the deviation between the set value of the heating steam temperature and the measured value of the heating steam temperature decreases;

[0050] The PID controller in the heating island control module adjusts and increases the heating regulating valve according to the deviation between the input heating steam temperature set value and the heating steam temperature measurement value;

[0051] The opening of the heating regulating valve increases, resulting in an increase in the pressure of the main steam header, and a decrease in the deviation between the measured main steam pressure and the set main steam pressure.

[0052] In the steam turbine control mode of the steam turbine control module, in the pressure control mode, the PID controller controls and adjusts the main steam regulating valve according to the deviation between the input main steam pressure measurement value and the main steam pressure set value, so as to maintain the pressure of the main steam header at the set value;

[0053] The main steam regulating valve is closed, the main steam entering the steam turbine is reduced, and the power generation capacity is reduced;

[0054] Considering the grid assessment restrictions, the following steps are included:

[0055] As the heating load increases, the steam flow rate through the superheater heat exchanger increases, the temperature of the external steam decreases, and the deviation between the set value of the heating steam temperature and the measured value of the heating steam temperature decreases;

[0056] The PID controller in the heating island control module adjusts and increases the heating regulating valve according to the deviation between the input heating steam temperature set value and the heating steam temperature measurement value;

[0057] The opening of the heating regulating valve increases, resulting in an increase in the pressure of the main steam header, and a decrease in the deviation between the measured main steam pressure and the set main steam pressure.

[0058] In the steam turbine control mode of the steam turbine control module, in the pressure control mode, the PID controller controls and adjusts the main steam regulating valve according to the deviation between the input main steam pressure measurement value and the main steam pressure set value, so as to maintain the pressure of the main steam header at the set value;

[0059] The main steam regulating valve is closed, the main steam entering the steam turbine is reduced, and the power generation capacity is reduced;

[0060] The actual power generation in the steam turbine control module is compared with the set load of the power grid. If the deviation caused by the increase in the heating load does not reach 80% of the lower limit of the allowable fluctuation of the power grid, the steam turbine control module continues to absorb the fluctuation of the heating load by reducing the steam turbine power.

[0061] If the deviation caused by the increase in heating load reaches 80% of the lower limit of the allowable fluctuation of the power grid, the turbine control module will send part of the electric power that exceeds the allowable limit of the power grid to the unit power setting value module as the reactor output total thermal power target value feedforward for adjustment, change the unit power setting value, and modify the reactor output thermal power set value of some NSSS modules through the power allocation module according to the preset allocation strategy. The corresponding NSSS module control system module increases the reactor power to achieve the increase in the output of the reactor output total thermal power to absorb the continued increase in the heating load until the heating load reaches the target value.

[0062] Compared with the prior art, the method for coordinated control of reactor, machine and heat under steady-state conditions of cogeneration of a multi-module high-temperature gas-cooled reactor of the present invention solves the problem of coupling of reactor control, heating load control and turbine load control, ensures the safety, stability, reliability and adjustability of the heating system, and improves the economic efficiency of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 A simplified diagram showing the process flow of the heating system;

[0064] Figure 2 A simplified process diagram of a typical dual-module high-temperature gas-cooled reactor pure condensing power generation unit;

[0065] Figure 3 Represents a typical dual-module high-temperature gas-cooled reactor pure condensing power generation unit;

[0066] Figure 4 A simplified process flow diagram of a multi-module high-temperature gas-cooled reactor unit for combined heat and power generation;

[0067] Figure 5 It shows the schematic diagram of the structure of the reactor, machine and heat coordinated control system of the multi-module high temperature gas-cooled reactor unit for cogeneration of heat and power;

[0068] Figure 6 Indicates the coordinated control flow chart of the reactor, machine and heat without considering the grid assessment restrictions;

[0069] Figure 7 It represents the coordinated control flow chart of the reactor, machine and heat considering the grid assessment limit;

[0070] In the figure,

[0071] 1-High temperature gas-cooled reactor unit, 2-Hualong No. 1 pressurized water reactor unit, 3-Three-circuit heating steam feed water, 4-saturated evaporation heat exchanger, 5-superheat heat exchanger, 6-external steam supply, 7-No. 1 NSSS module, 8-No. 2 NSSS module, 9-main steam regulating valve, 10-steam turbine generator unit, 11-grid set load, 12-generator power measurement signal, 13-unit power setting value module, 14-power distribution module, 15-No. 1 NSSS module control system module, 16-No. 2 NSSS module control system module, 17-No. 1 NSSS module output thermal power, 18-No. 2 NSSS Module output thermal power, 19-main steam pressure set value, 20-main steam pressure measured value, 21-steam turbine control module, 22-No. 3 NSSS module, 23-No. 4 NSSS module, 24-No. 5 NSSS module, 25-No. 6 NSSS module, 26-heating regulating valve, 27-heating island control module, 28-No. 3 NSSS module control system module, 29-No. 4 NSSS module control system module, 30-No. 5 NSSS module control system module, 31-No. 6 NSSS module control system module, 32-feed water pressure control module, 33-main steam pressure control module. DETAILED DESCRIPTION

[0072] In order to further understand the present invention, the embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the present invention.

[0073] The embodiment of the present invention discloses a steady-state reactor, machine and heat coordinated control system under a multi-module high-temperature gas-cooled reactor cogeneration condition. Figure 5 As shown, including:

[0074] The heating island control module 27 controls the heating regulating valve 26 to control the temperature of the external steam 6 to ensure the quality of the heating steam.

[0075] Specifically, it includes: collecting heating-related process measurement parameters, wherein the heating-related process measurement parameters include heating steam temperature or heating steam flow; setting an external steam temperature setting value; controlling the heating regulating valve 26 to maintain the external steam temperature at the setting value through a PID control algorithm according to the difference between the external steam temperature setting value and the heating steam temperature measurement value; receiving a signal from the unit power setting value module 28 that the total thermal power output of the reactor is about to be adjusted, stopping the adjustment of the heating regulating valve 26, ensuring that only the reactor and the machine are adjusted at the same time, and avoiding the simultaneous adjustment of the reactor, the machine, and the heat; calculating and outputting the secondary circuit heating load to the unit power setting value module 13, which is used to calculate the unit power setting value;

[0076] The steam turbine control module 21 controls the main steam regulating valve 9 to adjust the steam turbine power generation or maintain the main steam pressure.

[0077] Specifically, it includes: collecting turbine-related process parameter measurement signals, wherein the turbine-related process parameter measurement signals include turbine regulating stage pressure, turbine speed or power generation;

[0078] Receive the main steam pressure measurement signal from the main steam pressure control module 33 for participating in the main steam pressure control; manually set the allowable limit of the measurement signal fluctuation of the relevant process parameters of the turbine for the power generation control of the turbine and participating in the main steam pressure control; when the turbine is in the pressure mode, the main steam regulating valve 9 is controlled by the PID algorithm to maintain the main steam pressure at the set value according to the deviation between the main steam pressure measurement signal and the main steam pressure set value; when the heating load fluctuates greatly and the power generation exceeds the allowable limit of the power generation fluctuation, the part exceeding the power generation set value is sent to the machine as a feedforward signal The unit power setting value module 13 is used to adjust the total thermal power output of the reactor to achieve automatic control of the reactor, the machine and the heat coordination; when the steam turbine is in the load mode, the power generation power is controlled at the set value through the PID algorithm according to the deviation between the power generation power setting value and the power generation power measurement signal 12. At this time, the main steam pressure is controlled by the main steam pressure control module 33 to adjust the bypass valve group; the steam turbine control mode is output to the main steam pressure control module 33 for the main steam pressure control conversion; the power generation power measurement value is output to the unit power setting value module 13 for participating in the calculation of the unit power setting value;

[0079] The unit power setting value module 13, the secondary circuit heating load transmitted by the heat island control system module 27 and the turbine power generation measurement value of the turbine control module 21 calculate the reactor output total thermal power setting value for adjusting the reactor output total thermal power;

[0080] Specifically, the reactor output total thermal power constant is calculated according to the secondary circuit heating load transmitted by the heating island control module 27 and the turbine power generation measurement value of the turbine control module 21; the reactor output total thermal power constant is manually set; the difference between the power generation power of the turbine control module 21 and the allowable limit is received as a feedforward signal of the reactor output total thermal power, which is used to adjust the reactor output total thermal power, and at the same time, a signal that the reactor output total thermal power is about to be adjusted is sent to the heating island control module 27, which is used to stop the adjustment of the heating regulating valve; the reactor output total thermal power signal is output to the feed water pressure control module 32 to participate in the feed water pressure control;

[0081] The power allocation module 14 receives the reactor output thermal power of each NSSS module control system module, and is used to calculate the current reactor output total thermal rate; according to the preset power allocation strategy, the deviation between the set value of the reactor output total thermal power transmitted by the unit power setting value module 13 and the current reactor output total thermal power is allocated to the control system modules of all or part of the NSSS modules that have been put into automatic mode, so as to adjust the reactor output thermal power of the corresponding NSSS modules;

[0082] NSSS module control system module, manually set the NSSS module reactor output thermal power set value or receive the reactor output thermal power set value from the power distribution module; collect the process parameter measurement value of the NSSS module, the process parameter measurement value of the NSSS module includes one or more of the reactor power, main steam temperature, feed water flow rate and control rod position, calculate the reactor output thermal power, control the main helium fan, feed water regulating valve and control rod to control the reactor output thermal power to maintain at the set value; output the calculated value of the NSSS module reactor output thermal power and the status signal of the NSSS module to the power distribution module 14, and participate in the calculation of the total reactor output thermal power;

[0083] There are multiple NSSS module control system modules, including 6 in the specific embodiment, namely, No. 1 NSSS module control system module 15, No. 2 NSSS module control system module 16, No. 3 NSSS module control system module 28, No. 4 NSSS module control system module 29, No. 5 NSSS module control system module 30, and No. 6 NSSS module control system module 31;

[0084] The power distribution module 14, the No. 1 NSSS module control system module 15, the No. 2 NSSS module control system module 16, the No. 3 NSSS module control system module 28, the No. 4 NSSS module control system module 29, the No. 5 NSSS module control system module 30, and the No. 6 NSSS module control system module 31 coordinate and cooperate to adjust the total output power of the reactor to the set value.

[0085] Specifically, the functional principle of the control system module 15 of NSSS module No. 1 is: manually setting the set value of the reactor output thermal power of NSSS module No. 1 7 or receiving the set value of the reactor output thermal power from the power distribution module 14; collecting the measured values ​​of process parameters such as reactor power, main steam temperature, feed water flow, control rod position, etc. of NSSS module No. 1 7, calculating the reactor output thermal power, controlling the main helium fan, feed water regulating valve and control rod to control the reactor output thermal power to maintain at the set value; outputting the calculated value of the reactor output thermal power of NSSS module No. 1 7 and the status signal of the NSSS module to the power distribution module 14, participating in the calculation of the total reactor output thermal power.

[0086] The functional principle of the control system module 16 of the No. 2 NSSS module is as follows: manually set the set value of the reactor output thermal power of the No. 2 NSSS module 8 or receive the set value of the reactor output thermal power from the power allocation module 14; collect the measured values ​​of process parameters such as the reactor power, main steam temperature, feed water flow, and control rod position of the No. 2 NSSS module 8, calculate the reactor output thermal power, control the main helium fan, feed water regulating valve, and control rod to control the reactor output thermal power to remain at the set value; output the calculated value of the reactor output thermal power of the No. 2 NSSS module 8 and the status signal of the NSSS module to the power allocation module 14, and participate in the calculation of the total reactor output thermal power.

[0087] The functional principle of the control system module 28 of the No. 3 NSSS module is as follows: manually set the set value of the reactor output thermal power of the No. 3 NSSS module 22 or receive the set value of the reactor output thermal power from the power allocation module 14; collect the measured values ​​of process parameters such as the reactor power, main steam temperature, feed water flow, and control rod position of the No. 3 NSSS module 22, calculate the reactor output thermal power, control the main helium fan, feed water regulating valve, and control rod to control the reactor output thermal power to remain at the set value; output the calculated value of the reactor output thermal power of the No. 3 NSSS module 22 and the status signal of the NSSS module to the power allocation module 14, and participate in the calculation of the total reactor output thermal power.

[0088] The functional principle of the control system module 29 of the No. 4 NSSS module is as follows: manually set the set value of the reactor output thermal power of the No. 4 NSSS module 24 or receive the set value of the reactor output thermal power from the power allocation module 14; collect the measured values ​​of process parameters such as the reactor power, main steam temperature, feed water flow, and control rod position of the No. 4 NSSS module 23, calculate the reactor output thermal power, control the main helium fan, feed water regulating valve, and control rod to control the reactor output thermal power to remain at the set value; output the calculated value of the reactor output thermal power of the No. 4 NSSS module 23 and the status signal of the NSSS module to the power allocation module 14, and participate in the calculation of the total reactor output thermal power.

[0089] The functional principle of the control system module 30 of the No. 5 NSSS module is as follows: manually set the set value of the reactor output thermal power of the No. 5 NSSS module 24 or receive the set value of the reactor output thermal power from the power allocation module 14; collect the measured values ​​of process parameters such as the reactor power, main steam temperature, feed water flow, and control rod position of the No. 5 NSSS module 24, calculate the reactor output thermal power, control the main helium fan, feed water regulating valve, and control rod to control the reactor output thermal power to remain at the set value; output the calculated value of the reactor output thermal power of the No. 5 NSSS module 24 and the status signal of the NSSS module to the power allocation module 14, and participate in the calculation of the total reactor output thermal power.

[0090] The functional principle of the control system module 31 of the No. 6 NSSS module is as follows: manually setting the set value of the reactor output thermal power of the No. 6 NSSS module 25 or receiving the set value of the reactor output thermal power from the power allocation module 14; collecting the measured values ​​of the process parameters such as the reactor power, main steam temperature, feed water flow, and control rod position of the No. 6 NSSS module 25, calculating the reactor output thermal power, controlling the main helium fan, feed water regulating valve, and control rod to control the reactor output thermal power to maintain at the set value; outputting the calculated value of the reactor output thermal power of the No. 6 NSSS module 25 and the status signal of the NSSS module to the power allocation module 14, and participating in the calculation of the total reactor output thermal power.

[0091] The main steam pressure control module 33 collects the main steam main pipe pressure measurement signal; receives the turbine control mode status signal from the turbine control module 21, and is used to switch to the main steam pressure control mode; when receiving the signal that the turbine is in the load control mode, automatically controls the switch to the bypass valve to control the main steam pressure;

[0092] The feed water pressure control module 32 collects the feed water main pipe pressure measurement signal and controls the feed water pressure at a given value; it receives the reactor output total thermal power setting value signal from the unit power setting value module 13 as a feedforward signal for feed water pressure control.

[0093] Under steady-state conditions, the steam turbine control module 21 maintains the pressure of the main steam in the pressure control mode and automatically tracks the fluctuation of the heating load. When the heating load fluctuates greatly and the power generation exceeds the allowable fluctuation limit of the power generation, the difference between the power generation and the allowable limit is used as the feedforward signal of the total thermal power output of the reactor to adjust the total thermal power output of the reactor. At the same time, a signal that the total thermal power output of the reactor is about to be adjusted is sent to the heating island control module 27 to stop the adjustment of the heating regulating valve, thereby realizing "co-regulation of heat and power, and determining power by heat".

[0094] The present invention also provides a method for coordinated control of reactor, machine and heat in a steady-state condition under a multi-module high-temperature gas-cooled reactor cogeneration condition, which includes the following steps without considering the grid assessment restrictions:

[0095] When the heating load changes, the heating island control module adjusts the heating regulating valve through the PID control algorithm according to the deviation between the input heating steam temperature set value and the heating steam temperature measurement value;

[0096] The steam turbine control module controls and adjusts the main steam regulating valve according to the deviation between the input main steam pressure measurement value and the main steam pressure set value, so as to maintain the pressure of the main steam header at the set value;

[0097] Considering the grid assessment restrictions, the following steps are included:

[0098] When the heating load changes, the heating island control module adjusts the heating regulating valve through the PID control algorithm according to the deviation between the input heating steam temperature set value and the heating steam temperature measurement value;

[0099] The steam turbine control module controls and adjusts the main steam regulating valve according to the deviation between the input main steam pressure measurement value and the main steam pressure set value, so as to maintain the pressure of the main steam header at the set value;

[0100] The actual power generation in the steam turbine control module is compared with the set load of the power grid. If the deviation does not reach 80% of the allowable fluctuation limit of the power grid, the fluctuation of the heating load will continue to be absorbed by the change of the steam turbine power.

[0101] If the deviation reaches 80% of the allowable fluctuation limit of the power grid, the part of the electric power that exceeds the allowable limit of the power grid will be sent to the unit power setting value module as the reactor output total thermal power target value feedforward for adjustment, changing the unit power setting value, and modifying the reactor output thermal power set value of some NSSS modules through the power allocation module according to the preset allocation strategy. The corresponding NSSS module control system module adjusts the reactor power to achieve the change of the output reactor output total thermal power to absorb the continued change of the heating load until the heating load reaches the target value.

[0102] The calculation method of the part of the electric power that exceeds the allowable limit of the power grid is:

[0103] The portion of electric power that exceeds the permitted limit of the power grid = actual generator power - set power generation power × (1 + permitted limit of the power grid × 80%).

[0104] The heating load change includes a heating load decrease or increase.

[0105] When the heating load decreases, Figure 6 As shown, without considering the grid assessment restrictions, the following steps are included:

[0106] The heating load is reduced, the steam flow through the superheater heat exchanger is reduced, the temperature of the external steam is increased, and the deviation between the heating steam temperature setting value and the heating steam temperature measurement value is increased;

[0107] The PID controller in the heating island control module adjusts and closes the heating regulating valve according to the deviation between the input heating steam temperature set value and the heating steam temperature measurement value;

[0108] The heating regulating valve is closed, which causes the pressure of the main steam header to increase, and the deviation between the main steam pressure measurement value and the main steam pressure setting value increases;

[0109] In the steam turbine control mode of the steam turbine control module, in the pressure control mode, the PID controller controls and adjusts the main steam regulating valve according to the deviation between the input main steam pressure measurement value and the main steam pressure set value, so as to maintain the pressure of the main steam header at the set value;

[0110] The main steam regulating valve is opened wider, the main steam entering the steam turbine increases, and the power generation increases;

[0111] like Figure 7 As shown, considering the grid assessment restrictions, the following steps are included:

[0112] The heating load is reduced, the steam flow through the superheater heat exchanger is reduced, the temperature of the external steam is increased, and the deviation between the heating steam temperature setting value and the heating steam temperature measurement value is increased;

[0113] The PID controller in the heating island control module adjusts and closes the heating regulating valve according to the deviation between the input heating steam temperature set value and the heating steam temperature measurement value;

[0114] The heating regulating valve is closed, which causes the pressure of the main steam header to increase, and the deviation between the main steam pressure measurement value and the main steam pressure setting value increases;

[0115] In the steam turbine control mode of the steam turbine control module, in the pressure control mode, the PID controller controls and adjusts the main steam regulating valve according to the deviation between the input main steam pressure measurement value and the main steam pressure set value, so as to maintain the pressure of the main steam header at the set value;

[0116] The main steam regulating valve is opened wider, the main steam entering the steam turbine increases, and the power generation increases;

[0117] The generator power measurement signal 12 in the steam turbine control module is compared with the grid set load 11. If the deviation does not reach 80% of the upper limit of the grid allowable fluctuation, the fluctuation of the heating load is continuously absorbed by the change of the steam turbine power.

[0118] If the deviation reaches 80% of the upper limit of the grid's allowable fluctuation, the part of the electric power that exceeds the grid's allowable limit will be sent to the unit power setting value module as the reactor output total thermal power target value feedforward for adjustment, changing the unit power setting value, and modifying the reactor output thermal power set value of some NSSS modules through the power allocation module according to the preset allocation strategy. The corresponding NSSS module control system module reduces the reactor power, so as to reduce the output of the reactor output total thermal power to absorb the continued reduction in the heating load until the heating load reaches the target value.

[0119] When the heating load increases, without considering the grid assessment restrictions, the following steps are included:

[0120] As the heating load increases, the steam flow rate through the superheater heat exchanger increases, the temperature of the external steam decreases, and the deviation between the set value of the heating steam temperature and the measured value of the heating steam temperature decreases;

[0121] The PID controller in the heating island control module adjusts and increases the heating regulating valve according to the deviation between the input heating steam temperature set value and the heating steam temperature measurement value;

[0122] The opening of the heating regulating valve increases, resulting in an increase in the pressure of the main steam header, and a decrease in the deviation between the measured main steam pressure and the set main steam pressure.

[0123] In the steam turbine control mode of the steam turbine control module, in the pressure control mode, the PID controller controls and adjusts the main steam regulating valve according to the deviation between the input main steam pressure measurement value and the main steam pressure set value, so as to maintain the pressure of the main steam header at the set value;

[0124] The main steam regulating valve is closed, the main steam entering the steam turbine is reduced, and the power generation capacity is reduced;

[0125] Considering the grid assessment restrictions, the following steps are included:

[0126] As the heating load increases, the steam flow rate through the superheater heat exchanger increases, the temperature of the external steam decreases, and the deviation between the set value of the heating steam temperature and the measured value of the heating steam temperature decreases;

[0127] The PID controller in the heating island control module adjusts and increases the heating regulating valve according to the deviation between the input heating steam temperature set value and the heating steam temperature measurement value;

[0128] The opening of the heating regulating valve increases, resulting in an increase in the pressure of the main steam header, and a decrease in the deviation between the measured main steam pressure and the set main steam pressure.

[0129] In the steam turbine control mode of the steam turbine control module, in the pressure control mode, the PID controller controls and adjusts the main steam regulating valve according to the deviation between the input main steam pressure measurement value and the main steam pressure set value, so as to maintain the pressure of the main steam header at the set value;

[0130] The main steam regulating valve is closed, the main steam entering the steam turbine is reduced, and the power generation capacity is reduced;

[0131] The actual power generation in the steam turbine control module is compared with the set load of the power grid. If the deviation caused by the increase in the heating load does not reach 80% of the lower limit of the allowable fluctuation of the power grid, the steam turbine control module continues to absorb the fluctuation of the heating load by reducing the steam turbine power.

[0132] If the deviation caused by the increase in heating load reaches 80% of the lower limit of the allowable fluctuation of the power grid, the turbine control module will send part of the electric power that exceeds the allowable limit of the power grid to the unit power setting value module as the reactor output total thermal power target value feedforward for adjustment, change the unit power setting value, and modify the reactor output thermal power set value of some NSSS modules through the power allocation module according to the preset allocation strategy. The corresponding NSSS module control system module increases the reactor power to achieve the increase in the output of the reactor output total thermal power to absorb the continued increase in the heating load until the heating load reaches the target value.

[0133] The present invention designs a control method of "co-regulating heat and power, determining electricity by heat", that is, within the power generation fluctuation range allowed by the power grid, a control method of adjusting the power generation of the steam turbine in response to the adjustment of the heating load is preferentially adopted, which reduces the frequent adjustment of the reactor power and can give priority to ensuring the heating when the total thermal power output of the reactor is constant. During stable operation, only the steam turbine and the heating are controlled and adjusted at the same time, avoiding the risk of coupled control oscillation when the reactor, the machine and the heat are adjusted at the same time. At the same time, in order to adapt to the requirements of the power grid and the large fluctuation of the heating load, the power generation deviation is used as the feedforward of the unit power setting value to control and adjust the total thermal power output of the reactor, and the principle of thermal load balance between the first and second circuits is used to meet the demand of the heating load while adjusting the power generation power to within the allowable range of the power grid. And while the reactor power setting value is adjusted, the heating load is suspended to ensure that only the reactor and the steam turbine are adjusted at the same time, avoiding the risk of coupled control oscillation when the reactor, the machine and the heat are adjusted at the same time. Through the above method, it is achieved that nuclear safety is guaranteed first, heating is guaranteed second, and the remaining main steam is used for power generation.

[0134] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0135] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A coordinated control system for reactor, engine and heat in a steady-state condition under a multi-module high-temperature gas-cooled reactor cogeneration condition, characterized in that: include: The heating island control module collects the measurement parameters of the heating-related process and sets the set value of the external steam temperature. According to the difference between the set value of the external steam temperature and the measured value of the heating steam temperature, the heating regulating valve is controlled through the PID control algorithm to maintain the external steam temperature at the set value. The total thermal power output of the reactor is about to be adjusted from the unit power setting value module, and the adjustment of the heating regulating valve is stopped to ensure that only the reactor and the machine are adjusted at the same time, avoiding the simultaneous adjustment of the reactor, the machine and the heat. The heating load of the secondary circuit is calculated and output to the unit power setting value module for calculating the unit power setting value. The steam turbine control module collects measurement signals of relevant process parameters of the steam turbine, receives the main steam pressure measurement signal from the main steam pressure control module, and participates in the main steam pressure control; manually sets the allowable limit of fluctuation of measurement signals of relevant process parameters of the steam turbine, which is used for power generation control of the steam turbine and participation in the main steam pressure control; when the steam turbine is in pressure mode, the main steam regulating valve is controlled through the PID algorithm, and the main steam pressure is maintained at the set value according to the deviation between the main steam pressure measurement signal and the main steam pressure set value; when the heating load fluctuates greatly and the power generation exceeds the allowable limit of power generation fluctuation, the power generation exceeds the limit. The part of the rate setting value is sent as a feedforward signal to the unit power setting value module to adjust the total thermal power output of the reactor and realize the automatic control of the reactor, the machine and the heat; when the steam turbine is in the load mode, according to the deviation between the power generation setting value and the power generation measurement signal, the power generation is controlled at the setting value through the PID algorithm. At this time, the main steam pressure is controlled by the main steam pressure control module to adjust the bypass valve group; the steam turbine control mode is output to the main steam pressure control module for the main steam pressure control conversion; the power generation measurement value is output to the unit power setting value module to participate in the calculation of the unit power setting value; The unit power setting value module calculates the reactor output total thermal power constant value according to the secondary circuit heating load transmitted by the heating island control system module and the turbine power generation measurement value of the turbine control module; manually sets the reactor output total thermal power constant value; receives the difference between the power generation power of the turbine control module and the allowable limit as the feedforward signal of the reactor output total thermal power, which is used to adjust the reactor output total thermal power, and at the same time sends the reactor output total thermal power adjustment signal to the heating island control module, which is used to stop the adjustment of the heating regulating valve; outputs the reactor output total thermal power signal to the feed water pressure control module to participate in the feed water pressure control; The power allocation module receives the reactor thermal power output of each NSSS module control system module, and is used to calculate the current reactor output total thermal rate; according to the preset power allocation strategy, the deviation between the set value of the reactor output total thermal power transmitted by the unit power setting value module and the current reactor output total thermal power is allocated to the control system modules of all or part of the NSSS modules that have been put into automatic mode, so as to adjust the reactor output thermal power of the corresponding NSSS modules; NSSS module control system module, manually set the NSSS module reactor output thermal power set value or receive the reactor output thermal power set value from the power distribution module; collect the process parameter measurement values ​​of the NSSS module, calculate the reactor output thermal power, control the main helium fan, feed water regulating valve and control rod to control the reactor output thermal power to maintain at the set value; output the calculated value of the NSSS module reactor output thermal power and the status signal of the NSSS module to the power distribution module, and participate in the calculation of the total reactor output thermal power; The main steam pressure control module collects the main steam main pipe pressure measurement signal; receives the turbine control mode status signal from the turbine control module, and is used to switch to the main steam pressure control mode; when receiving the signal that the turbine is in load control mode, it automatically controls the switch to the bypass valve to control the main steam pressure; The feed water pressure control module collects the feed water main pipe pressure measurement signal and controls the feed water pressure at a given value; it receives the reactor output total thermal power setting value signal from the unit power setting value module as a feedforward signal for feed water pressure control.

2. The steady-state reactor, machine and heat coordinated control system for multi-module high-temperature gas-cooled reactor cogeneration under the condition of claim 1 is characterized in that: The heating-related process measurement parameters include heating steam temperature or heating steam flow rate.

3. The steady-state reactor, machine and heat coordinated control system for a multi-module high-temperature gas-cooled reactor cogeneration system according to claim 1 is characterized in that: The steam turbine related process parameter measurement signal includes the steam turbine regulating stage pressure, the steam turbine speed or the generated power.

4. The method for coordinated control of reactor, machine and heat in steady-state condition of multi-module high-temperature gas-cooled reactor cogeneration under the condition of claim 1 is characterized in that: The NSSS module control system module is provided with multiple, NSSS modules operate independently or simultaneously.

5. The method for coordinated control of reactor, machine and heat in steady-state condition of multi-module high-temperature gas-cooled reactor cogeneration under the condition of claim 1 is characterized in that: The process parameter measurement values ​​of the NSSS module include one or more of reactor power, main steam temperature, feed water flow rate and control rod position.

6. A method for coordinated control of reactor, machine and heat in steady-state conditions of a multi-module high-temperature gas-cooled reactor cogeneration, characterized in that: Without considering the grid assessment restrictions, the following steps are included: When the heating load changes, the heating island control module adjusts the heating regulating valve through the PID control algorithm according to the deviation between the input heating steam temperature set value and the heating steam temperature measurement value; The steam turbine control module controls and adjusts the main steam regulating valve according to the deviation between the input main steam pressure measurement value and the main steam pressure set value, so as to maintain the pressure of the main steam header at the set value; Considering the grid assessment restrictions, the following steps are included: When the heating load changes, the heating island control module adjusts the heating regulating valve through the PID control algorithm according to the deviation between the input heating steam temperature set value and the heating steam temperature measurement value; The steam turbine control module controls and adjusts the main steam regulating valve according to the deviation between the input main steam pressure measurement value and the main steam pressure set value, so as to maintain the pressure of the main steam header at the set value; The actual power generation in the steam turbine control module is compared with the set load of the power grid. If the deviation does not reach 80% of the allowable fluctuation limit of the power grid, the fluctuation of the heating load will continue to be absorbed by the change of the steam turbine power. If the deviation reaches 80% of the allowable fluctuation limit of the power grid, the part of the electric power that exceeds the allowable limit of the power grid will be sent to the unit power setting value module as the feedforward of the reactor output total thermal power target value for adjustment, and the unit power setting value will be changed. The power allocation module will modify the reactor output thermal power set value of some NSSS modules according to the preset allocation strategy, and the corresponding NSSS module control system module will adjust the reactor power to achieve the change of the output total thermal power of the reactor to absorb the continued change of the heating load until the heating load reaches the target value.

7. The method for coordinated control of reactor, machine and heat in steady-state conditions of a multi-module high-temperature gas-cooled reactor cogeneration under claim 6 is characterized in that: The calculation method of the part of the electric power that exceeds the allowable limit of the power grid is: The portion of electric power that exceeds the permitted limit of the power grid = actual generator power - set power generation power × (1 + permitted limit of the power grid × 80%).

8. The method for coordinated control of reactor, machine and heat in steady-state condition of multi-module high-temperature gas-cooled reactor cogeneration under claim 6 is characterized in that: The heating load change includes a heating load decrease or increase.

9. The method for coordinated control of reactor, machine and heat in steady-state conditions of a multi-module high-temperature gas-cooled reactor cogeneration under claim 7 is characterized in that: When the heating load is reduced, without considering the grid assessment restrictions, the following steps are included: The heating load is reduced, the steam flow through the superheater heat exchanger is reduced, the temperature of the external steam is increased, and the deviation between the heating steam temperature setting value and the heating steam temperature measurement value is increased; The PID controller in the heating island control module adjusts and closes the heating regulating valve according to the deviation between the input heating steam temperature set value and the heating steam temperature measurement value; The heating regulating valve is closed, which causes the pressure of the main steam header to increase, and the deviation between the main steam pressure measurement value and the main steam pressure setting value increases; In the steam turbine control mode of the steam turbine control module, in the pressure control mode, the PID controller controls and adjusts the main steam regulating valve according to the deviation between the input main steam pressure measurement value and the main steam pressure set value, so as to maintain the pressure of the main steam header at the set value; The main steam regulating valve is opened wider, the main steam entering the steam turbine increases, and the power generation increases; Considering the grid assessment restrictions, the following steps are included: The heating load is reduced, the steam flow through the superheater heat exchanger is reduced, the temperature of the external steam is increased, and the deviation between the heating steam temperature setting value and the heating steam temperature measurement value is increased; The PID controller in the heating island control module adjusts and closes the heating regulating valve according to the deviation between the input heating steam temperature set value and the heating steam temperature measurement value; The heating regulating valve is closed, which causes the pressure of the main steam header to increase, and the deviation between the main steam pressure measurement value and the main steam pressure setting value increases; In the steam turbine control mode of the steam turbine control module, in the pressure control mode, the PID controller controls and adjusts the main steam regulating valve according to the deviation between the input main steam pressure measurement value and the main steam pressure set value, so as to maintain the pressure of the main steam header at the set value; The main steam regulating valve is opened wider, the main steam entering the steam turbine increases, and the power generation increases; The actual power generation in the steam turbine control module is compared with the set load of the power grid. If the deviation does not reach 80% of the upper limit of the fluctuation allowed by the power grid, the fluctuation of the heating load will continue to be absorbed by the change of the steam turbine power. If the deviation reaches 80% of the upper limit of the grid's allowable fluctuation, the part of the electric power that exceeds the grid's allowable limit will be sent to the unit power setting value module as the reactor output total thermal power target value feedforward for adjustment, changing the unit power setting value, and modifying the reactor output thermal power set value of some NSSS modules through the power allocation module according to the preset allocation strategy. The corresponding NSSS module control system module reduces the reactor power, so as to reduce the output of the reactor output total thermal power to absorb the continued reduction in the heating load until the heating load reaches the target value.

10. The method for coordinated control of reactor, machine and heat in steady-state condition of multi-module high-temperature gas-cooled reactor cogeneration under claim 6, characterized in that: When the heating load increases, without considering the grid assessment restrictions, the following steps are included: As the heating load increases, the steam flow rate through the superheater heat exchanger increases, the temperature of the external steam decreases, and the deviation between the set value of the heating steam temperature and the measured value of the heating steam temperature decreases; The PID controller in the heating island control module adjusts and increases the heating regulating valve according to the deviation between the input heating steam temperature set value and the heating steam temperature measurement value; The opening of the heating regulating valve increases, resulting in an increase in the pressure of the main steam header, and a decrease in the deviation between the measured main steam pressure and the set main steam pressure. In the steam turbine control mode of the steam turbine control module, in the pressure control mode, the PID controller controls and adjusts the main steam regulating valve according to the deviation between the input main steam pressure measurement value and the main steam pressure set value, so as to maintain the pressure of the main steam header at the set value; The main steam regulating valve is closed, the main steam entering the steam turbine is reduced, and the power generation capacity is reduced; Considering the grid assessment restrictions, the following steps are included: As the heating load increases, the steam flow rate through the superheater heat exchanger increases, the temperature of the external steam decreases, and the deviation between the set value of the heating steam temperature and the measured value of the heating steam temperature decreases; The PID controller in the heating island control module adjusts and increases the heating regulating valve according to the deviation between the input heating steam temperature set value and the heating steam temperature measurement value; The opening of the heating regulating valve increases, resulting in an increase in the pressure of the main steam header, and a decrease in the deviation between the measured main steam pressure and the set main steam pressure. In the steam turbine control mode of the steam turbine control module, in the pressure control mode, the PID controller controls and adjusts the main steam regulating valve according to the deviation between the input main steam pressure measurement value and the main steam pressure set value, so as to maintain the pressure of the main steam header at the set value; The main steam regulating valve is closed, the main steam entering the steam turbine is reduced, and the power generation capacity is reduced; The actual power generation in the steam turbine control module is compared with the set load of the power grid. If the deviation caused by the increase in the heating load does not reach 80% of the lower limit of the allowable fluctuation of the power grid, the steam turbine control module continues to absorb the fluctuation of the heating load by reducing the steam turbine power. If the deviation caused by the increase in heating load reaches 80% of the lower limit of the allowable fluctuation of the power grid, the turbine control module will send part of the electric power that exceeds the allowable limit of the power grid to the unit power setting value module as the reactor output total thermal power target value feedforward for adjustment, change the unit power setting value, and modify the reactor output thermal power set value of some NSSS modules through the power allocation module according to the preset allocation strategy. The corresponding NSSS module control system module increases the reactor power to achieve the increase in the output of the reactor output total thermal power to absorb the continued increase in the heating load until the heating load reaches the target value.

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