Main steam temperature control method, device and system of thermal power generating unit

Abstract

The invention provides a main steam temperature control method, device and system for a thermal power generating unit. The method comprises the steps that the temperature set value, the main steam temperature and the temperature after a desuperheater of the thermal power generating unit to be controlled are obtained; whether the temperature set value, the main steam temperature and the temperature behind the desuperheater meet preset deviation conditions or not is judged, if yes, target output data of a main controller are obtained after preset duration is reached, and target output data of an auxiliary controller are determined according to the current temperature behind the desuperheater and the target output data of the main controller; according to the target output data of the auxiliary controller, the opening degree of a water spraying and temperature reducing valve of the thermal power generating unit to be controlled is adjusted, and main steam temperature control over the thermal power generating unit to be controlled is completed; wherein the main controller, the auxiliary controller and the water spraying and temperature reducing valve are connected in sequence. The reliability of main steam temperature control of the thermal power generating unit can be improved, and the safety of operation of the thermal power generating unit is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of thermal power unit control, and in particular to a main steam temperature control method, device and system for a thermal power unit. Background Art

[0002] The main steam temperature is one of the important parameters in the operation of thermal power units, and its control effect directly affects the safety and economy of the unit's production. The main steam temperature is the steam temperature at the outlet of the boiler's final superheater, and should be maintained within a relatively precise range. If the main steam temperature is too high, it will affect the life of the materials of various parts of the superheater and even endanger the safe operation of the unit. If the main steam temperature is too low, it will reduce the thermal efficiency of the unit and reduce the power plant's revenue. Therefore, it is necessary to control the main steam temperature of the thermal power unit to ensure that the main steam temperature has good quality.

[0003] Currently, if Figure 1 As shown, the main steam temperature control of thermal power units usually adopts water spray cooling control. The water spray cooling valve is arranged before the boiler superheater. The main steam temperature after the boiler superheater is controlled by water spray cooling. The water spray cooling valve mainly adopts cascade PID control. The control logic is as follows Figure 2 As shown, Figure 2 The control mode of the MODE module can be manual or automatic. When the valve is put into automatic mode, the valve opening is automatically calculated by the cascade control algorithm. In manual mode, the valve opening is input by the power plant operator, the controller 2 output tracks the valve opening, the controller 1 output tracks the temperature after the desuperheater, and the temperature set value tracks the actual main steam temperature. Figure 2 The middle connecting line 1 to the connecting line 3 is the tracking line; when the water spray cooling valve is automatic, the tracking line does not work, and the outputs of the two controllers are calculated according to the deviation between their respective set values ​​and control values ​​to control the output.

[0004] However, the existing main steam temperature cascade PID control method will have a problem of conflicting adjustment directions between the main controller and the sub-controller under variable load conditions. This is due to the mismatch between the main controller parameters (such as proportional action 1 and integral action 1) and the sub-controller parameters (such as proportional action 2 and integral action 2) and the current main steam temperature characteristics (such as main steam flow, flue gas volume and cooling water flow). Under different loads and different operating conditions, the main steam temperature characteristics of the thermal power unit are changing, while the main controller parameters and the sub-controller parameters are fixed. This problem will lead to untimely main steam temperature adjustment, seriously affecting the safe and stable operation of the unit. Summary of the invention

[0005] In response to at least one problem in the prior art, the present application proposes a main steam temperature control method, device and system for a thermal power unit, which can improve the reliability of the main steam temperature control of the thermal power unit and ensure the safety of the operation of the thermal power unit.

[0006] In order to solve the above technical problems, this application provides the following technical solutions:

[0007] In a first aspect, the present application provides a main steam temperature control method for a thermal power unit, comprising:

[0008] Obtain the temperature setting value, main steam temperature and temperature after the desuperheater of the thermal power unit to be controlled;

[0009] Determine whether the temperature setting value, the main steam temperature and the temperature after the desuperheater meet the preset deviation condition. If so, obtain the current temperature after the desuperheater and the target output data of the main controller after the preset time, and determine the target output data of the sub-controller according to the current temperature after the desuperheater and the target output data of the main controller;

[0010] According to the target output data of the sub-controller, the opening of the water spray cooling valve of the thermal power unit to be controlled is adjusted to complete the main steam temperature control of the thermal power unit to be controlled; wherein the main controller, sub-controller and water spray cooling valve are connected in sequence.

[0011] In one embodiment, the determining whether the temperature setting value, the main steam temperature and the temperature after the desuperheater meet a preset deviation condition, and if so, obtaining the target output data of the main controller after reaching a preset time, includes:

[0012] Determining output data of the main controller according to the temperature setting value and the main steam temperature;

[0013] Determine whether the difference between the temperature setting value and the main steam temperature, and the difference between the temperature after the desuperheater and the output data of the main controller are both greater than a first difference threshold, or whether the difference between the temperature setting value and the main steam temperature, and the difference between the temperature after the desuperheater and the output data of the main controller are both less than a second difference threshold; if so, determine that the temperature setting value, the main steam temperature and the temperature after the desuperheater meet a preset deviation condition, and after reaching a preset time, obtain the current temperature after the desuperheater and the target output data of the main controller.

[0014] In one embodiment, the main steam temperature control method of a thermal power unit further comprises:

[0015] Before or when the preset time is reached, obtaining the current main steam temperature of the thermal power unit to be controlled;

[0016] The target output data of the main controller is determined according to the temperature setting value and the current main steam temperature.

[0017] In one embodiment, the main steam temperature control method of a thermal power unit further comprises:

[0018] During the preset time period, the output data of the main controller is controlled to be the temperature after the desuperheater, so that the output data of the sub-controller remains unchanged.

[0019] In one embodiment, after determining whether the temperature setting value, the main steam temperature and the temperature after the desuperheater meet the preset deviation condition, the method further includes:

[0020] If the temperature setting value, the main steam temperature and the temperature after the desuperheater do not meet the preset deviation conditions, the target output data of the sub-controller is determined according to the temperature setting value, the main steam temperature and the temperature after the desuperheater.

[0021] In a second aspect, the present application provides a main steam temperature control device for a thermal power unit, comprising:

[0022] An acquisition module is used to obtain the temperature setting value, main steam temperature and temperature after the desuperheater of the thermal power unit to be controlled;

[0023] a determination module, used to determine whether the temperature setting value, the main steam temperature and the temperature after the desuperheater meet the preset deviation condition, and if so, after reaching the preset time, obtain the current temperature after the desuperheater and the target output data of the main controller, and determine the target output data of the sub-controller according to the current temperature after the desuperheater and the target output data of the main controller;

[0024] A control module is used to adjust the opening of the water spray cooling valve of the thermal power unit to be controlled according to the target output data of the auxiliary controller, so as to complete the main steam temperature control of the thermal power unit to be controlled; wherein the main controller, the auxiliary controller and the water spray cooling valve are connected in sequence.

[0025] In one embodiment, the determining module includes:

[0026] A determination unit, used for determining output data of a main controller according to the temperature setting value and the main steam temperature;

[0027] An acquisition unit is used to determine whether the difference between the temperature setting value and the main steam temperature, and the difference between the temperature after the desuperheater and the output data of the main controller are both greater than a first difference threshold, or whether the difference between the temperature setting value and the main steam temperature, and the difference between the temperature after the desuperheater and the output data of the main controller are both less than a second difference threshold. If so, it is determined that the temperature setting value, the main steam temperature and the temperature after the desuperheater meet the preset deviation condition, and after reaching a preset time, the current temperature after the desuperheater and the target output data of the main controller are acquired.

[0028] In one embodiment, the main steam temperature control device of the thermal power unit further includes:

[0029] A main steam temperature acquisition module is used to acquire the current main steam temperature of the thermal power unit to be controlled before or when the preset time is reached;

[0030] The first output data determination module is used to determine the target output data of the main controller according to the temperature setting value and the current main steam temperature.

[0031] In one embodiment, the main steam temperature control device of the thermal power unit further includes:

[0032] The control output data module is used to control the output data of the main controller to be the temperature after the desuperheater within the preset time period, so that the output data of the sub-controller remains unchanged.

[0033] In one embodiment, the main steam temperature control device of the thermal power unit further includes:

[0034] The second output data determination module is used to determine the target output data of the sub-controller according to the temperature setting value, the main steam temperature and the temperature after the desuperheater if the temperature setting value, the main steam temperature and the temperature after the desuperheater do not meet the preset deviation conditions.

[0035] In a third aspect, the present application provides a main steam temperature control system for a thermal power unit, comprising:

[0036] A main controller, a sub-controller and a main steam temperature control device of the thermal power unit;

[0037] The main steam temperature control device is connected to the main controller and the sub-controller respectively, and the sub-controller is used to be connected to the water spray cooling valve.

[0038] In a fourth aspect, the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the main steam temperature control method of the thermal power unit when executing the program.

[0039] In a fifth aspect, the present application provides a computer-readable storage medium having computer instructions stored thereon, which, when executed by a processor, implement the main steam temperature control method of the thermal power unit.

[0040] It can be seen from the above technical scheme that the present application provides a method, device and system for controlling the main steam temperature of a thermal power unit. The method includes: obtaining the temperature setting value, main steam temperature and temperature after the desuperheater of the thermal power unit to be controlled; judging whether the temperature setting value, main steam temperature and temperature after the desuperheater meet the preset deviation condition; if so, obtaining the current temperature after the desuperheater and the target output data of the main controller after the preset time, and determining the target output data of the sub-controller according to the current temperature after the desuperheater and the target output data of the main controller; adjusting the opening of the water spray desuperheating valve of the thermal power unit to be controlled according to the target output data of the sub-controller, and completing the main steam temperature control of the thermal power unit to be controlled; wherein the main controller, the sub-controller and the water spray desuperheating valve are connected in sequence, which can improve the reliability of the main steam temperature control of the thermal power unit and ensure the safety of the operation of the thermal power unit; specifically, it can solve the problem of poor control effect when the working conditions change or the main steam characteristics change, and can achieve stable control of the main steam temperature. The whole process is automatically realized through DCS logic, which reduces the operation of operators and can achieve better control effects. In view of the problem of untimely main steam temperature adjustment caused by the mismatch between the main steam temperature cascade control parameters and the changing air temperature characteristics, the cascade control needs to be corrected automatically through the judgment conditions, and then the cascade control is automatically corrected. The sub-controller setting value can automatically track the sub-controller's controlled quantity, and the logic of the controller output mutation is designed. There is no need to change the control parameters of the two controllers, which can increase the robustness of the cascade control and improve the main steam temperature safety of the unit. The self-correction conditions of the cascade controller can be flexibly adjusted according to the actual situation on site. It can be easily configured and applied in DCS control systems of different manufacturers, has good practicality, and is easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 It is a schematic diagram of the layout of the temperature measuring points after the desuperheater and the main steam temperature measuring points in the prior art;

[0043] Figure 2 It is a logic diagram of the cascade PID control method of the main steam temperature of a thermal power unit in the prior art;

[0044] Figure 3 It is a first flow chart of the main steam temperature control method of a thermal power unit in an embodiment of the present application;

[0045] Figure 4 It is a second flow diagram of the main steam temperature control method of a thermal power unit in an embodiment of the present application;

[0046] Figure 5 It is a logic diagram of a main steam temperature control method of a thermal power unit in an example of the present application;

[0047] Figure 6 It is a structural schematic diagram of a main steam temperature control device for a thermal power unit in an embodiment of the present application;

[0048] Figure 7 It is a schematic block diagram of the system structure of the electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0050] With the rapid development of the power industry, newly built thermal power plants in recent years are generally supercritical or even ultra-supercritical units, and the performance requirements for control systems are getting higher and higher. Among them, the main steam temperature is a controlled object that needs to strictly control its parameter range. The main steam temperature is one of the important parameters in the operation of thermal power units, and its control effect directly affects the safety and economy of unit production. The main steam temperature is the steam temperature at the outlet of the last stage superheater of the boiler, and it should be maintained in a relatively accurate range. The main steam temperature system has a complex structure, many influencing factors, and frequent uncertain disturbances. During operation, the main steam temperature is often too high because the control system cannot overcome the influence of disturbances in time, which in turn leads to a decrease in the allowable stress of the heating surface pipeline, and the strength of the metal material of the pipeline also decreases. In addition, the thermal expansion of the parts around the superheater makes the superheater and nearby components very easy to deform and then be damaged. Over-temperature operation of the superheater is also the main cause of its pipe burst. Therefore, in order to ensure the safety of the unit, lowering the set value of the main steam temperature system is a method often taken by operators. However, if the main steam temperature is operated at a low temperature for a long time, the thermal efficiency of the unit will decrease, affecting the economic efficiency of the unit operation. According to analysis, for every 5-10°C decrease in the main steam temperature, the thermal efficiency of the unit will decrease by 1%. This not only increases the fuel consumption, but also causes excessive humidity when the steam enters the last stage of the low-pressure cylinder of the turbine, increasing the risk of turbine blade breakage or corrosion. This situation has existed for a long time in many thermal power plants, resulting in a large amount of primary energy waste. Excessive steam temperature will affect the life of various materials of the superheater and even endanger the safe operation of the unit. Excessive main steam temperature will reduce the thermal efficiency of the unit and reduce the revenue of the power plant. Therefore, a suitable control strategy is needed to ensure that the main steam temperature has good quality.

[0051] Figure 2 It is the cascade control mode mainly used by thermal power units. In the automatic mode, the control action adopted by controller 1 is the reverse action, the temperature setting value is the setting value s1 of controller 1, the actual main steam temperature is the controlled variable p1 of controller 1, and the output of controller 1 is u1=u10+(s1-p1)×(proportional action 1+integral action 1). The larger the setting value of controller 1, the larger the output value u1. u10 is the output value of controller 1 at the time of automatic activation; for controller 2, the output of controller 1 is the setting value s2 of controller 2, the temperature after the desuperheater is the controlled variable p2 of controller 2, the control action of controller 2 is the reverse action, and the output of controller 2 is u2=u20+(p2-s2)×(proportional action 2+integral action 2), and u20 is the output value of controller 2 at the time of automatic activation.

[0052] Cascade control can better solve the problem of large inertia and large delay characteristics of the system. Controller 1 is called the main controller, and the output of controller 1 is used as the input of the sub-controller (controller 2). When the temperature setting value increases, the deviation of the main controller e = s1-p1 becomes larger, and the output of the main controller increases; since the sub-controller is a reaction, the output of the sub-controller is also the reduction of the cooling water valve, and finally the purpose of increasing the main steam temperature is achieved.

[0053] Based on this, in order to solve the problem of poor control effect caused by the mismatch between control parameters and main steam temperature characteristics in the main steam temperature cascade control of thermal power units in the above-mentioned prior art, the embodiment of the present application provides a main steam temperature control method, device and system for thermal power units. Under the original cascade control mode, when the deviation between the two controllers is too large and in opposite directions, the set value of the sub-controller tracks the controlled variable of the sub-controller for 2s through self-correction control, so that the sub-controller can quickly respond to the output of the main controller, and the control direction is the same as that of the main controller. The reverse logic module and the delayed rise logic module can be used to design a detection logic every 20s, which can timely detect the situation where the deviation between the two controllers is too large and in opposite directions. In order to ensure that the output of the sub-controller does not change suddenly when the set value of the sub-controller tracks the controlled variable, a 0.5s delayed rise logic module is used to ensure that the prohibition of rise and the prohibition of fall signals are earlier than the tracking signal. It can solve the problem of poor adaptability of the most commonly used cascade control method for main steam temperature control in thermal power plants at this stage. It uses a self-correction method including self-correction judgment logic to enter a series of self-correction control logics; it can be applied to the DCS control system of thermal power units to optimize and improve the main steam temperature control.

[0054] The details are described through the following embodiments.

[0055] In order to improve the reliability of the main steam temperature control of the thermal power unit and ensure the safety of the operation of the thermal power unit, this embodiment provides a main steam temperature control method of the thermal power unit, the execution subject of which is a main steam temperature control device of the thermal power unit. The main steam temperature control device of the thermal power unit includes but is not limited to a server, such as Figure 3 As shown, the method specifically includes the following contents:

[0056] Step 100: Obtain the temperature setting value, main steam temperature and post-desuperheater temperature of the thermal power unit to be controlled.

[0057] Specifically, the temperature setting value, main steam temperature and temperature after the desuperheater of the thermal power unit to be controlled can be obtained at preset time intervals. Obtaining the temperature setting value, main steam temperature and temperature after the desuperheater of the thermal power unit to be controlled at preset time intervals can be equivalent to triggering a self-detection signal at a fixed time.

[0058] Step 200: Determine whether the temperature setting value, the main steam temperature and the temperature after the desuperheater meet the preset deviation conditions. If so, after reaching the preset time, obtain the current temperature after the desuperheater and the target output data of the main controller, and determine the target output data of the sub-controller based on the current temperature after the desuperheater and the target output data of the main controller.

[0059] Specifically, the preset time interval and preset duration can be set according to actual conditions, and this application does not limit this. For example, the preset time interval is 20 seconds, automatic detection is performed every 20 seconds, and the preset duration is 1.5s. The sub-controller can be used to determine the target output data of the sub-controller according to the current temperature after the desuperheater and the target output data of the main controller; the target output data u2 of the sub-controller can be determined according to the following formula:

[0060] u2=u20+(p2'-u1')×(proportional action 2+integral action 2), wherein p2' represents the current temperature after the desuperheater, u1' represents the target output data of the main controller, and u20 is the output value of the sub-controller at the time of automatic start.

[0061] Step 300: According to the target output data of the sub-controller, the opening of the water spray cooling valve of the thermal power unit to be controlled is adjusted to complete the main steam temperature control of the thermal power unit to be controlled; wherein the main controller, sub-controller and water spray cooling valve are connected in sequence.

[0062] In order to improve the reliability of determining the target output data of the main controller, such as Figure 4 As shown, in one embodiment, the step 200 determines whether the temperature setting value, the main steam temperature and the temperature after the desuperheater meet the preset deviation condition. If so, after reaching the preset time, the current temperature after the desuperheater and the target output data of the main controller are obtained, including:

[0063] Step 201: Determine the output data of the main controller according to the temperature setting value and the main steam temperature.

[0064] Specifically, a main controller may be applied to determine the output data of the main controller according to the temperature setting value and the main steam temperature; the output data u1 of the main controller may be determined according to the following formula:

[0065] u1=u10+(s1-p1)×(proportional action 1+integral action 1), where s1 represents the temperature setting value, p1 represents the main steam temperature, and u10 is the output value of the main controller at the time of automatic start.

[0066] Step 202: Determine whether the difference between the temperature setting value and the main steam temperature and the difference between the temperature after the desuperheater and the output data of the main controller are both greater than a first difference threshold, or whether the difference between the temperature setting value and the main steam temperature and the difference between the temperature after the desuperheater and the output data of the main controller are both less than a second difference threshold. If so, determine whether the temperature setting value, the main steam temperature and the temperature after the desuperheater meet the preset deviation condition, and after reaching a preset time, obtain the current temperature after the desuperheater and the target output data of the main controller.

[0067] Specifically, assuming that the temperature setting value is s1, the main steam temperature is p1, the output data of the main controller is u1, the temperature after the desuperheater to be processed is p2, the first difference threshold is T1, and the second difference threshold is T2, then, if (s1-p1)>T1 and (p2-u1)>T1, or, (s1-p1)<T2 and (p2-u1)<T2, it can be determined that the temperature setting value, the main steam temperature and the temperature after the desuperheater to be processed meet the preset deviation condition, otherwise the preset deviation condition is not met. Preferably, T1=3, T2=-3.

[0068] Figure 5 This is a logic diagram of a main steam temperature control method of a thermal power unit in an example of this application. Figure 5 The connecting lines 4 to 7 in the figure represent tracking lines (analog quantities), the remaining solid lines are also analog quantities, and the dotted lines represent digital signals (switch quantities, either 1 or 0). In this example, (1) when D1 = (s1-p1) > 3 and D2 = (p2-u1) > 3 or when D1 = (s1-p1) is less than -3 and D2 = (p2-u1) is less than -3, the sub-controller setting value is triggered to track the actual value, where the setting value s2 of controller 2 is u1. Logic (1) is automatically detected once every 20 seconds. (3) When (1) is triggered, the sub-controller is prohibited from increasing or decreasing to avoid changes in the sub-controller output due to sudden changes in the temperature setting value.

[0069] Specifically, Figure 5 The AND module in the figure outputs 1 when both inputs are 1, otherwise the output is 0; the selection module outputs the same as the Y input when the selection signal (dashed line) is 1, and the output is the same as the N input when the selection signal is 0. The pulse 1s (second) means that when the input signal is 1, the output is a 1 signal with a duration of 1s, and the output is 0 after 1s.

[0070] Figure 5The output of the AND module in is the trigger signal. Its two output signals are the trigger conditions of the combination of D1 and D2, and the self-detection signal that is triggered once every 20 seconds. When the trigger signal is 1, a 1.5s pulse signal is first sent to the sub-controller to prohibit the increase or decrease of the temperature, ensuring that the output of the sub-controller remains unchanged within 1.5 seconds. At the same time, a 1s pulse is triggered after 0.5 seconds to enter the selection module of module 2. Within 1 second, the output of the selection module 2 is the Y input terminal (that is, the temperature after the desuperheater). At the same time, since there is a tracking line between controller 1 and selection module 2, during this period, the output of controller 1 is the same as the output of selection module 2, which is the temperature after the desuperheater (the ultimate purpose of the above logic is to make the output of controller 1 the same as the temperature after the desuperheater within 1.5 seconds after the trigger signal becomes 1). After 1.5 seconds, the control terminal and the prohibition of increase or decrease signal of the selection module 2 become 0, and the output of controller 1 will be updated based on the temperature after the desuperheater, and this value will be transmitted to the S terminal of controller 2. This value is compared with the P terminal of controller 2 and then calculated by controller 2 to control the valve opening.

[0071] In order to further improve the reliability of the main steam temperature control of the thermal power unit, in one embodiment, the main steam temperature control method of the thermal power unit further includes:

[0072] Step 001: Before or when the preset time is reached, the current main steam temperature of the thermal power unit to be controlled is obtained.

[0073] Step 002: Determine the target output data of the main controller according to the temperature setting value and the current main steam temperature.

[0074] Specifically, the main controller may be applied to determine the target output data of the main controller according to the temperature setting value and the current main steam temperature; the target output data u1' of the main controller may be determined according to the following formula:

[0075] u1'=u10+(s1-p1')×(proportional action 1+integral action 1), where s1 represents the temperature setting value, p1' represents the current main steam temperature, and u10 is the output value of the main controller at the time of automatic start.

[0076] In order to avoid changes in the output of the sub-controller caused by sudden changes in the temperature setting value, in one embodiment, the main steam temperature control method of the thermal power unit also includes: within the preset time period, controlling the output data of the main controller to be the temperature after the desuperheater so that the output data of the sub-controller remains unchanged.

[0077] That is to say, within the preset time period, the sub-controller is prohibited from increasing or decreasing.

[0078] In order to improve the reliability of determining the target output data of the sub-controller, in one embodiment, after determining whether the temperature setting value, the main steam temperature and the temperature after the desuperheater meet the preset deviation condition in step 200, the following is further included:

[0079] Step 400: If the temperature setting value, the main steam temperature and the temperature after the desuperheater do not meet the preset deviation conditions, the target output data of the sub-controller is determined according to the temperature setting value, the main steam temperature and the temperature after the desuperheater.

[0080] Specifically, if the temperature setting value, the main steam temperature and the temperature after the desuperheater do not meet the preset deviation conditions, the target output data u2 of the sub-controller can be determined according to the following formula:

[0081] u1=u10+(s1-p1)×(proportional action 1+integral action 1)

[0082] u2=u20+(p2-u1)×(proportional action 2+integral action 2)

[0083] Among them, s1 represents the temperature setting value, p1 represents the main steam temperature, u10 is the output value of the main controller when it is automatically put into operation, p2 represents the temperature after the desuperheater, and u20 is the output value of the sub-controller when it is automatically put into operation.

[0084] From the software level, in order to improve the reliability of the main steam temperature control of the thermal power unit and ensure the safety of the operation of the thermal power unit, the present application provides an embodiment of a main steam temperature control device for a thermal power unit for implementing all or part of the contents of the main steam temperature control method of the thermal power unit, see Figure 6 The main steam temperature control device of the thermal power unit specifically includes the following contents:

[0085] Acquisition module 01, used to obtain the temperature setting value, main steam temperature and temperature after the desuperheater of the thermal power unit to be controlled;

[0086] Determination module 02, used to determine whether the temperature setting value, main steam temperature and temperature after the desuperheater meet the preset deviation condition, if so, after reaching the preset time, obtain the current temperature after the desuperheater and the target output data of the main controller, and determine the target output data of the sub-controller according to the current temperature after the desuperheater and the target output data of the main controller;

[0087] The control module 03 is used to adjust the opening of the water spray cooling valve of the thermal power unit to be controlled according to the target output data of the sub-controller, so as to complete the main steam temperature control of the thermal power unit to be controlled; wherein the main controller, sub-controller and water spray cooling valve are connected in sequence.

[0088] In one embodiment, the determining module includes:

[0089] A determination unit, used for determining output data of a main controller according to the temperature setting value and the main steam temperature;

[0090] An acquisition unit is used to determine whether the difference between the temperature setting value and the main steam temperature, and the difference between the temperature after the desuperheater and the output data of the main controller are both greater than a first difference threshold, or whether the difference between the temperature setting value and the main steam temperature, and the difference between the temperature after the desuperheater and the output data of the main controller are both less than a second difference threshold. If so, it is determined that the temperature setting value, the main steam temperature and the temperature after the desuperheater meet the preset deviation condition, and after reaching a preset time, the current temperature after the desuperheater and the target output data of the main controller are acquired.

[0091] In one embodiment, the main steam temperature control device of the thermal power unit further includes:

[0092] A main steam temperature acquisition module is used to acquire the current main steam temperature of the thermal power unit to be controlled before or when the preset time is reached;

[0093] The first output data determination module is used to determine the target output data of the main controller according to the temperature setting value and the current main steam temperature.

[0094] In one embodiment, the main steam temperature control device of the thermal power unit further includes:

[0095] The control output data module is used to control the output data of the main controller to be the temperature after the desuperheater within the preset time period, so that the output data of the sub-controller remains unchanged.

[0096] In one embodiment, the main steam temperature control device of the thermal power unit further includes:

[0097] The second output data determination module is used to determine the target output data of the sub-controller according to the temperature setting value, the main steam temperature and the temperature after the desuperheater if the temperature setting value, the main steam temperature and the temperature after the desuperheater do not meet the preset deviation conditions.

[0098] The embodiment of the main steam temperature control device of a thermal power unit provided in this specification can be specifically used to execute the processing flow of the embodiment of the main steam temperature control method of the thermal power unit mentioned above. Its functions will not be repeated here, and reference can be made to the detailed description of the embodiment of the main steam temperature control method of the thermal power unit mentioned above.

[0099] In order to further illustrate the present scheme, the present application provides an application example of a main steam temperature control system of a thermal power unit, the system comprising: a main controller, a sub-controller and a main steam temperature control device of the thermal power unit; the main steam temperature control device is connected to the main controller and the sub-controller respectively, and the sub-controller is used to connect to a water spray cooling valve.

[0100] Specifically, the main steam temperature control device of the thermal power unit can be integrated into the sub-controller.

[0101] Figure 7 A schematic diagram of the physical structure of an electronic device provided in an embodiment of the present invention, such as Figure 7 As shown, the electronic device includes: a memory 701, a processor 702, and a computer program stored in the memory 701 and executable on the processor 702. When the processor 702 executes the computer program, the following method is implemented:

[0102] Obtain the temperature setting value, main steam temperature and temperature after the desuperheater of the thermal power unit to be controlled;

[0103] Determine whether the temperature setting value, the main steam temperature and the temperature after the desuperheater meet the preset deviation condition. If so, obtain the current temperature after the desuperheater and the target output data of the main controller after the preset time, and determine the target output data of the sub-controller according to the current temperature after the desuperheater and the target output data of the main controller;

[0104] According to the target output data of the sub-controller, the opening of the water spray cooling valve of the thermal power unit to be controlled is adjusted to complete the main steam temperature control of the thermal power unit to be controlled; wherein the main controller, sub-controller and water spray cooling valve are connected in sequence.

[0105] This embodiment discloses a computer program product, the computer program product including a computer program, and when the computer program is executed by a processor, the following method is implemented:

[0106] Obtain the temperature setting value, main steam temperature and temperature after the desuperheater of the thermal power unit to be controlled;

[0107] Determining a target main steam temperature and a target post-desuperheater temperature according to the temperature setting value, the main steam temperature, the post-desuperheater temperature and a preset deviation condition;

[0108] According to the temperature setting value, the target main steam temperature and the target temperature after the desuperheater, the opening of the water spray desuperheating valve of the thermal power unit to be controlled is adjusted to complete the main steam temperature control of the thermal power unit to be controlled.

[0109] This embodiment provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the following method is implemented:

[0110] Obtain the temperature setting value, main steam temperature and temperature after the desuperheater of the thermal power unit to be controlled;

[0111] Determine whether the temperature setting value, the main steam temperature and the temperature after the desuperheater meet the preset deviation condition. If so, obtain the current temperature after the desuperheater and the target output data of the main controller after the preset time, and determine the target output data of the sub-controller according to the current temperature after the desuperheater and the target output data of the main controller;

[0112] According to the target output data of the sub-controller, the opening of the water spray cooling valve of the thermal power unit to be controlled is adjusted to complete the main steam temperature control of the thermal power unit to be controlled; wherein the main controller, sub-controller and water spray cooling valve are connected in sequence.

[0113] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0114] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0115] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0116] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0117] In the description of this specification, the description with reference to the terms "one embodiment", "a specific embodiment", "some embodiments", "for example", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0118] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A main steam temperature control method for a thermal power unit, characterized in that: include: Obtain the temperature setting value, main steam temperature and temperature after the desuperheater of the thermal power unit to be controlled; Determine whether the temperature setting value, the main steam temperature and the temperature after the desuperheater meet the preset deviation condition. If so, obtain the current temperature after the desuperheater and the target output data of the main controller after the preset time, and determine the target output data of the sub-controller according to the current temperature after the desuperheater and the target output data of the main controller; According to the target output data of the sub-controller, the opening of the water spray cooling valve of the thermal power unit to be controlled is adjusted to complete the main steam temperature control of the thermal power unit to be controlled; wherein the main controller, sub-controller and water spray cooling valve are connected in sequence.

2. The main steam temperature control method of a thermal power unit according to claim 1, characterized in that: The step of judging whether the temperature setting value, the main steam temperature and the temperature after the desuperheater meet the preset deviation condition, and if so, obtaining the current temperature after the desuperheater and the target output data of the main controller after reaching the preset time, includes: Determining output data of the main controller according to the temperature setting value and the main steam temperature; Determine whether the difference between the temperature setting value and the main steam temperature, and the difference between the temperature after the desuperheater and the output data of the main controller are both greater than a first difference threshold, or whether the difference between the temperature setting value and the main steam temperature, and the difference between the temperature after the desuperheater and the output data of the main controller are both less than a second difference threshold; if so, determine that the temperature setting value, the main steam temperature and the temperature after the desuperheater meet a preset deviation condition, and after reaching a preset time, obtain the current temperature after the desuperheater and the target output data of the main controller.

3. The main steam temperature control method of a thermal power unit according to claim 2, characterized in that: Also includes: Before or when the preset time is reached, obtaining the current main steam temperature of the thermal power unit to be controlled; The target output data of the main controller is determined according to the temperature setting value and the current main steam temperature.

4. The main steam temperature control method of a thermal power unit according to claim 1, characterized in that: Also includes: During the preset time period, the output data of the main controller is controlled to be the temperature after the desuperheater, so that the output data of the sub-controller remains unchanged.

5. The main steam temperature control method of a thermal power unit according to claim 1, characterized in that: After determining whether the temperature setting value, the main steam temperature and the temperature after the desuperheater meet the preset deviation condition, the method further includes: If the temperature setting value, the main steam temperature and the temperature after the desuperheater do not meet the preset deviation conditions, the target output data of the sub-controller is determined according to the temperature setting value, the main steam temperature and the temperature after the desuperheater.

6. A main steam temperature control device for a thermal power unit, characterized in that: include: An acquisition module is used to obtain the temperature setting value, main steam temperature and temperature after the desuperheater of the thermal power unit to be controlled; a determination module, used to determine whether the temperature setting value, the main steam temperature and the temperature after the desuperheater meet the preset deviation condition, and if so, after reaching the preset time, obtain the current temperature after the desuperheater and the target output data of the main controller, and determine the target output data of the sub-controller according to the current temperature after the desuperheater and the target output data of the main controller; A control module is used to adjust the opening of the water spray cooling valve of the thermal power unit to be controlled according to the target output data of the auxiliary controller, so as to complete the main steam temperature control of the thermal power unit to be controlled; wherein the main controller, the auxiliary controller and the water spray cooling valve are connected in sequence.

7. The main steam temperature control device of a thermal power unit according to claim 6, characterized in that: The determination module comprises: A determination unit, used to determine output data of the main controller according to the temperature setting value and the main steam temperature; An acquisition unit is used to determine whether the difference between the temperature setting value and the main steam temperature, and the difference between the temperature after the desuperheater and the output data of the main controller are both greater than a first difference threshold, or whether the difference between the temperature setting value and the main steam temperature, and the difference between the temperature after the desuperheater and the output data of the main controller are both less than a second difference threshold. If so, it is determined that the temperature setting value, the main steam temperature and the temperature after the desuperheater meet the preset deviation condition, and after reaching a preset time, the current temperature after the desuperheater and the target output data of the main controller are acquired.

8. A main steam temperature control system for a thermal power unit, characterized in that: include: A main controller, a sub-controller and a main steam temperature control device for a thermal power unit as claimed in claim 6 or 7; The main steam temperature control device is connected to the main controller and the sub-controller respectively, and the sub-controller is used to be connected to the water spray cooling valve.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the main steam temperature control method of a thermal power unit according to any one of claims 1 to 5 is implemented.

10. A computer-readable storage medium having computer instructions stored thereon, characterized in that: When the instruction is executed by the processor, the main steam temperature control method of the thermal power unit according to any one of claims 1 to 5 is implemented.

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