Main steam temperature control device and method for thermal power unit

Abstract

The present invention discloses a main steam temperature control device and method for a thermal power unit, wherein the device comprises: a PID controller and a temperature control regulating valve; the PID controller is used to send an override action instruction to the temperature control regulating valve when the main steam temperature deviation value and the main steam temperature change rate both exceed the set range, and the override action instruction contains an override action amount; the temperature control regulating valve is used to control the main steam temperature of the thermal power unit according to the override action instruction. The present invention can control the temperature of the main steam of the thermal power unit to ensure the safe and stable operation of the unit.

Description

Technical Field

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

[0002] At present, the power supply structure of the domestic power grid is complex. In order to maintain the safe and stable operation of the power grid system, conventional thermal power generating units need to have a higher load change rate to meet the safety and assessment requirements of the power grid. On the other hand, due to the domestic coal resources and the economic requirements of power plants, the quality of coal is very unstable. When the thermal power units maintain a high load change rate, the main steam temperature of the units fluctuates greatly due to factors such as coal quality fluctuations and boiler combustion.

[0003] The fluctuation of the unit's main steam temperature has a direct impact on the unit's steam quality and load-raising and lowering capabilities. At present, the main steam temperature control adopts a PID cascade control strategy with a pilot temperature control. The temperature setting value is the unit's load curve, and the PID control design is a proportional, integral, and differential control with load variables. When the unit increases or decreases the load, the automatic adjustment mode that only responds to temperature fluctuations through changes in PID parameters is insufficient in the response speed of the temperature control valve. When the load is stable, it cannot effectively perform automatic prediction and adjustment based on the boiler combustion conditions, making it difficult to ensure the safe and stable operation of the unit. Summary of the invention

[0004] The embodiment of the present invention provides a main steam temperature control device for a thermal power unit, which is used to control the temperature of the main steam of the thermal power unit to ensure safe and stable operation of the unit. The device includes: a PID controller and a temperature control regulating valve;

[0005] The PID controller is used to send an override action instruction to the temperature control valve when the main steam temperature deviation value and the main steam temperature change rate both exceed the set range, and the override action instruction includes an override action amount;

[0006] The temperature control regulating valve is used to control the main steam temperature of the thermal power unit according to the override action instruction.

[0007] The embodiment of the present invention provides a method for controlling the temperature of main steam of a thermal power unit, which is used to control the temperature of main steam of the thermal power unit to ensure safe and stable operation of the unit. The method includes:

[0008] The PID controller sends an override action command to the temperature control valve when the main steam temperature deviation value and the main steam temperature change rate both exceed the set range, wherein the override action command includes an override action amount;

[0009] The temperature control regulating valve controls the main steam temperature of the thermal power unit according to the override action instruction.

[0010] An embodiment of the present invention further provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the main steam temperature control method for a thermal power unit.

[0011] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program for executing the above-mentioned main steam temperature control method for a thermal power unit.

[0012] Compared with the automatic adjustment scheme in the prior art that only responds to temperature fluctuations by changing PID parameters, the main steam temperature control device of a thermal power unit provided in an embodiment of the present invention includes a PID controller and a temperature control valve; the PID controller is used to send an override action instruction to the temperature control valve when the main steam temperature deviation value and the main steam temperature change rate both exceed the set range, and the override action instruction includes an override action amount; the temperature control valve is used to control the main steam temperature of the thermal power unit according to the override action instruction. The embodiment of the present invention adds an override switch function on the basis of the PID controller parameter change automatic adjustment mode, and sends an override action instruction including an override action amount to the temperature control valve when the main steam temperature deviation value and the main steam temperature change rate both exceed the set range, and then the temperature control valve controls the main steam temperature of the thermal power unit according to the override action instruction, thereby realizing a rapid response of the temperature control valve and ensuring safe and stable operation of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0014] Figure 1 This is a structural diagram of a main steam temperature control device for a thermal power unit according to an embodiment of the present invention;

[0015] Figure 2-3 This is the main steam temperature control process of a thermal power unit in a specific embodiment of the present invention;

[0016] Figure 4 Schematic diagram of a method for controlling the main steam temperature of a thermal power unit in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0018] In order to control the temperature of the main steam of a thermal power unit and ensure the safe and stable operation of the unit, an embodiment of the present invention provides a main steam temperature control device for a thermal power unit, such as Figure 1 As shown, the device may include: a PID controller 101 and a temperature control regulating valve 102;

[0019] The PID controller is used to send an override action instruction to the temperature control valve when the main steam temperature deviation value and the main steam temperature change rate both exceed the set range, and the override action instruction includes an override action amount;

[0020] The temperature control regulating valve is used to control the main steam temperature of the thermal power unit according to the override action instruction.

[0021] Depend on Figure 1 It can be seen from the figure that the main steam temperature control device of the thermal power unit provided by the embodiment of the present invention includes a PID controller and a temperature control valve; the PID controller is used to send an override action instruction to the temperature control valve when the main steam temperature deviation value and the main steam temperature change rate both exceed the set range, and the override action instruction contains an override action amount; the temperature control valve is used to control the main steam temperature of the thermal power unit according to the override action instruction. The embodiment of the present invention adds an override switch function on the basis of the PID controller parameter change automatic adjustment mode, and sends an override action instruction containing an override action amount to the temperature control valve when the main steam temperature deviation value and the main steam temperature change rate both exceed the set range, and then the temperature control valve controls the main steam temperature of the thermal power unit according to the override action instruction, thereby realizing a rapid response of the temperature control valve and ensuring the safe and stable operation of the unit.

[0022] In the embodiment, the main steam temperature deviation value is the difference between the main steam temperature setting value and the main steam temperature measurement value.

[0023] In an embodiment, the PID controller is a PID cascade controller, and the PID cascade controller includes a main regulating PID controller and a sub-regulating PID controller.

[0024] In the embodiment, the PID controller is specifically used for:

[0025] When the main steam temperature deviation value is greater than the first set value and the main steam temperature change rate is greater than the second set value, a first override action instruction is issued to the temperature control valve, wherein the first override action instruction includes a first override action amount;

[0026] The temperature control regulating valve is specifically used to adjust the valve opening according to the first override action amount included in the first override action instruction.

[0027] In this embodiment, the PID controller is further used for:

[0028] When the main steam temperature deviation value is greater than a third set value, a second override action instruction is issued to the temperature control valve, wherein the second override action instruction includes a first override action amount and a second override action amount, and the third set value is greater than the first set value;

[0029] The temperature control regulating valve is further used to adjust the valve opening according to the first override action amount and the second override action amount included in the second override action instruction.

[0030] In this embodiment, the temperature control regulating valve is further used to: adjust the valve opening according to a weighted result of the first override action amount and the second override action amount.

[0031] In this embodiment, the PID controller is specifically used for:

[0032] When the main steam temperature deviation value is less than the fourth set value and the main steam temperature change rate is less than the fifth set value, a third override action instruction is issued to the temperature control regulating valve, wherein the third override action instruction includes a third override action amount;

[0033] The temperature control regulating valve is specifically used to adjust the valve opening according to the third override action amount contained in the third override action instruction.

[0034] In this embodiment, the PID controller is further used for:

[0035] When the main steam temperature deviation value is less than the sixth set value, a fourth override action instruction is issued to the temperature control valve, wherein the fourth override action instruction includes a third override action amount and a fourth override action amount, and the sixth set value is less than the fourth set value;

[0036] The temperature control regulating valve is further used to adjust the valve opening according to the third override action amount and the fourth override action amount contained in the fourth override action instruction.

[0037] In this embodiment, the temperature control regulating valve is further used to: adjust the valve opening according to a weighted result of the third override action amount and the fourth override action amount.

[0038] The inventors have found that the main steam temperature of a thermal power unit is usually controlled by adjusting the secondary desuperheater valve to adjust the desuperheating water flow rate. Under normal operation of the unit, the main steam temperature control is divided into manual and automatic states. In the manual state, the operator independently determines the temperature change and the need for the temperature target value, and switches the regulating valve; in the automatic state, the operator clicks the button on the DCS screen operation terminal to start the automatic operation, changes the temperature setting value according to the unit load needs, and realizes the automatic switching of the regulating valve. The current conventional design of the main steam temperature control of thermal power units is PID cascade control, such as Figure 2 As shown. The PID cascade controller includes a main regulating PID controller and a sub-regulating PID controller. In the main regulating PID controller, the main steam temperature is the controlled object, the temperature corresponding to the unit load is the set value, and the output of the main regulating PID controller is the set value of the sub-regulating PID controller, that is, the set value of the secondary desuperheater outlet temperature; in the sub-regulating PID controller, the secondary desuperheater outlet temperature is the controlled object, and the sub-regulating output is the temperature control valve instruction. The proportional and integral parameters of the main and sub-regulating controllers are the function curves corresponding to the unit load. The proportional and integral curves are obtained through disturbance tests: the unit is in various stable load conditions, and the optimal parameters under each condition are obtained by performing disturbance tests on the main steam temperature control system; this is used as the basis of the parameter function, and the parameter curve is verified and optimized during the process of increasing and decreasing the load of the unit to avoid temperature control fluctuations caused by parameter changes. However, when the unit increases and decreases the load, the automatic adjustment mode that only responds to temperature fluctuations through changes in PID parameters is insufficient in the response speed of the temperature control valve. When the load is stable, it cannot effectively perform automatic prediction and adjustment according to the boiler combustion conditions, and thus it is difficult to ensure the safe and stable operation of the unit. Therefore, in order to realize the advanced predictive control and self-adjustment action of temperature control, the inventors added an override switch function of the temperature control valve based on temperature deviation and temperature change rate to the PID controller. When the main steam temperature deviation value and the main steam temperature change rate both exceed the set range, an override action instruction containing the override action amount is sent to the temperature control valve, and then the temperature control valve controls the main steam temperature of the thermal power unit according to the override action instruction, thereby realizing a rapid response of the temperature control valve and ensuring the safe and stable operation of the unit.

[0039] In specific implementation, when the main steam temperature of the unit is in the automatic control state, when the main steam temperature deviation value is greater than the first set value K1 and the main steam temperature change rate is greater than the second set value V1, a first override action instruction is immediately issued to the temperature control valve, and the temperature control valve is overridden according to the first override action amount in the first override action instruction. The temperature control valve is quickly responded to the temperature change trend. When any condition is not met, the opening of the override action is reset to restore normal PID automatic control;

[0040] When the main steam temperature deviation value continues to increase to the third set value K2 (the absolute value of K1 is less than the absolute value of K2) on the basis of the above, a second override action instruction is immediately issued to the temperature control valve, and the temperature control valve is overridden on and off according to the first override action amount and the second override action amount in the second override action instruction, wherein the first override action amount and the second override action amount are weightedly calculated, the weight is set according to the needs, and the valve opening is adjusted according to the weighted result to achieve rapid response. When the temperature deviation returns to the value range, the opening of the override action is reset to restore normal PID control;

[0041] When the main steam temperature of the unit is in the automatic control state, when the main steam temperature deviation value is less than the fourth set value (which can be set to the opposite number of K1 - K1) and the main steam temperature change rate is less than the fifth set value (which can be set to the opposite number of V1 - V1), the third override action instruction is immediately issued to the temperature control valve, and the temperature control valve is overridden according to the third override action amount in the third override action instruction. The temperature control valve is quickly responded to the temperature change trend. When any condition is not met, the opening of the override action is reset to restore normal PID automatic control;

[0042] When the main steam temperature deviation value continues to drop to the sixth set value (which can be set to the opposite number of K2 - K2, where the absolute value of K1 is less than the absolute value of K2) on the basis of the above, the fourth override action instruction is immediately issued to the temperature control valve, and the temperature control valve is overridden on and off according to the third override action amount and the fourth override action amount in the fourth override action instruction, wherein the third override action amount and the fourth override action amount are weightedly calculated, the weight is set as needed, and the valve opening is adjusted according to the weighted result to achieve rapid response. When the temperature deviation returns to the value range, the opening of the override action is reset to restore normal PID control;

[0043] After the trigger condition occurs, based on the valve action in the original automatic control state, the valve opening is quickly opened or closed by the K3 value. When the trigger condition disappears, the K3 value of the action is restored. The entire override action does not affect the PID automatic control operation.

[0044] It should be noted that the basis for determining K2 is: the operating procedures of the power plant have requirements for the range of main steam temperature fluctuation under normal operation of the unit. In addition, combined with the characteristics of the unit equipment, the unit economy, and safety factors, the temperature fluctuation margin specified in the regulations is set to K2; the basis for determining V and K1 is: according to the power plant operating procedures, when the temperature fluctuation deviates from the normal target, the alarm value is used as K1, and the temperature change rate V is the temperature change rate value specified in the unit protection logic to maintain the logical unity of the unit; the basis for determining K3 is: according to the data obtained from the control valve characteristic test, under a stable operating condition, the temperature change K2 value is the required valve opening amount.

[0045] When implementing it, Figure 3 As shown, condition 1 and condition 2 cannot exist at the same time; condition 3 and condition 4 cannot exist at the same time; in the weighted calculation, the weighted coefficient for each signal can be set to 1, or the coefficient can be corrected according to the control valve characteristics. When only condition 1 occurs, the override action amount switches from 0 to constant 1 (the first override action amount), and after two layers of weighted calculation to the final override action amount (the others are 0, and the final result is the first override action amount), it is superimposed on the control valve opening, that is, the override amount and the auxiliary PID output value are calculated through the addition function block, and the result is used as the control valve opening instruction; when only condition 2 occurs, the override action amount switches from 0 to constant 2 (the third override action amount), and after two layers of weighted calculation to the final override action amount (the others are 0, and the final result is the third override action amount) , superimposed on the control valve opening; when condition 3 occurs, the overspeed action amount switches from 0 to constant 3, and after two layers of weighted calculation, it is superimposed on the control valve opening in the final overspeed action amount; when condition 4 occurs, the overspeed action amount switches from 0 to constant 4, and after two layers of weighted calculation, it is superimposed on the control valve opening in the final overspeed action amount; when conditions 1 and 3 both occur, the overspeed action is constant 1 + constant 3, and the superimposed value is on the control valve opening; when conditions 2 and 4 both occur, the overspeed action is constant 2 + constant 4, and the superimposed value is on the control valve opening. It should be noted that in the application, there are cases where condition 3 occurs alone, condition 1 occurs alone, and there are also cases where condition 1 and condition 3 occur at the same time; similarly, there are cases where condition 4 occurs alone, condition 2 occurs alone, and there are also cases where condition 2 and condition 4 occur at the same time, but conditions 1 and 3 are opposite to conditions 2 and 4 and cannot occur at the same time.

[0046] Based on the same inventive concept, the embodiment of the present invention also provides a method for controlling the main steam temperature of a thermal power unit using the above device, as described in the following embodiment. Since the principles of solving these problems are similar to those of the main steam temperature control device of a thermal power unit, the implementation of the method can refer to the implementation of the device, and the repeated parts will not be repeated.

[0047] Figure 4 FIG. 1 is a schematic diagram of a method for controlling the main steam temperature of a thermal power unit according to an embodiment of the present invention. Figure 4 As shown, the method includes:

[0048] Step 401, when the main steam temperature deviation value and the main steam temperature change rate both exceed the set range, the PID controller sends an override action instruction to the temperature control valve, wherein the override action instruction includes an override action amount;

[0049] Step 402: The temperature control regulating valve controls the main steam temperature of the thermal power unit according to the override action instruction.

[0050] In one embodiment, when the main steam temperature deviation value is greater than a first set value and the main steam temperature change rate is greater than a second set value, the PID controller sends a first override action instruction to the temperature control valve, wherein the first override action instruction includes a first override action amount, and the temperature control valve adjusts the valve opening according to the first override action amount included in the first override action instruction;

[0051] When the main steam temperature deviation value is greater than the third set value, the PID controller sends a second override action instruction to the temperature control valve, the second override action instruction includes a first override action amount and a second override action amount, the third set value is greater than the first set value, and the temperature control valve adjusts the valve opening according to the first override action amount and the second override action amount included in the second override action instruction, wherein the temperature control valve adjusts the valve opening according to a weighted result of the first override action amount and the second override action amount;

[0052] When the main steam temperature deviation value is less than the fourth set value and the main steam temperature change rate is less than the fifth set value, the PID controller sends a third override action instruction to the temperature control valve, wherein the third override action instruction includes a third override action amount, and the temperature control valve adjusts the valve opening according to the third override action amount included in the third override action instruction;

[0053] When the main steam temperature deviation value is less than the sixth set value, the PID controller sends a fourth override action instruction to the temperature control valve, the fourth override action instruction includes a third override action amount and a fourth override action amount, the sixth set value is less than the fourth set value, and the temperature control valve adjusts the valve opening according to the third override action amount and the fourth override action amount included in the fourth override action instruction, wherein the temperature control valve adjusts the valve opening according to a weighted result of the third override action amount and the fourth override action amount.

[0054] In summary, the main steam temperature control device of a thermal power unit provided by an embodiment of the present invention comprises a PID controller and a temperature control valve; the PID controller is used to send an override action instruction to the temperature control valve when the main steam temperature deviation value and the main steam temperature change rate both exceed the set range, and the override action instruction includes an override action amount; the temperature control valve is used to control the main steam temperature of the thermal power unit according to the override action instruction. The embodiment of the present invention adds an override switch function on the basis of the PID controller parameter change automatic adjustment mode, and sends an override action instruction including an override action amount to the temperature control valve when the main steam temperature deviation value and the main steam temperature change rate both exceed the set range, and then the temperature control valve controls the main steam temperature of the thermal power unit according to the override action instruction, thereby realizing a rapid response of the temperature control valve and ensuring safe and stable operation of the unit.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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 The steps for the functions specified in one or more boxes.

[0059] 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 device for a thermal power unit, characterized in that: include: PID controller and temperature control valve; The PID controller is used to send an override action instruction to the temperature control valve when the main steam temperature deviation value and the main steam temperature change rate both exceed the set range, and the override action instruction includes an override action amount; The temperature control regulating valve is used to control the main steam temperature of the thermal power unit according to the override action instruction; The PID controller is a PID cascade controller, and the PID cascade controller includes a main regulating PID controller and a sub-regulating PID controller; The PID controller is specifically used for: When the main steam temperature deviation value is greater than the first set value and the main steam temperature change rate is greater than the second set value, a first override action instruction is issued to the temperature control valve, wherein the first override action instruction includes a first override action amount; The temperature control regulating valve is specifically used to: adjust the valve opening according to the first override action amount included in the first override action instruction; The PID controller is further used to: When the main steam temperature deviation value is greater than a third set value, a second override action instruction is issued to the temperature control valve, wherein the second override action instruction includes a first override action amount and a second override action amount, and the third set value is greater than the first set value; The temperature control regulating valve is further used to adjust the valve opening according to the first override action amount and the second override action amount included in the second override action instruction.

2. The main steam temperature control device for a thermal power unit according to claim 1, characterized in that: The temperature control regulating valve is further used to adjust the valve opening according to a weighted result of the first override action amount and the second override action amount.

3. The main steam temperature control device for a thermal power unit according to claim 1, characterized in that: The PID controller is specifically used for: When the main steam temperature deviation value is less than the fourth set value and the main steam temperature change rate is less than the fifth set value, a third override action instruction is issued to the temperature control regulating valve, wherein the third override action instruction includes a third override action amount; The temperature control regulating valve is specifically used to adjust the valve opening according to the third override action amount contained in the third override action instruction.

4. The main steam temperature control device for a thermal power unit according to claim 3, characterized in that: The PID controller is further used to: When the main steam temperature deviation value is less than the sixth set value, a fourth override action instruction is issued to the temperature control valve, wherein the fourth override action instruction includes a third override action amount and a fourth override action amount, and the sixth set value is less than the fourth set value; The temperature control regulating valve is further used to adjust the valve opening according to the third override action amount and the fourth override action amount contained in the fourth override action instruction.

5. The main steam temperature control device for a thermal power unit according to claim 4, characterized in that: The temperature control regulating valve is further used to adjust the valve opening according to a weighted result of the third override action amount and the fourth override action amount.

6. A method for controlling the main steam temperature of a thermal power unit using the device according to any one of claims 1 to 5, characterized in that: include: The PID controller sends an override action command to the temperature control valve when the main steam temperature deviation value and the main steam temperature change rate both exceed the set range, wherein the override action command includes an override action amount; The temperature control regulating valve controls the main steam temperature of the thermal power unit according to the override action instruction.

7. The method for controlling the main steam temperature of a thermal power unit according to claim 6, characterized in that: When the main steam temperature deviation value is greater than the first set value and the main steam temperature change rate is greater than the second set value, the PID controller sends a first override action instruction to the temperature control valve, wherein the first override action instruction includes a first override action amount, and the temperature control valve adjusts the valve opening according to the first override action amount included in the first override action instruction; When the main steam temperature deviation value is greater than the third set value, the PID controller sends a second override action instruction to the temperature control valve, the second override action instruction includes a first override action amount and a second override action amount, the third set value is greater than the first set value, and the temperature control valve adjusts the valve opening according to the first override action amount and the second override action amount included in the second override action instruction, wherein the temperature control valve adjusts the valve opening according to a weighted result of the first override action amount and the second override action amount; When the main steam temperature deviation value is less than the fourth set value and the main steam temperature change rate is less than the fifth set value, the PID controller sends a third override action instruction to the temperature control valve, wherein the third override action instruction includes a third override action amount, and the temperature control valve adjusts the valve opening according to the third override action amount included in the third override action instruction; When the main steam temperature deviation value is less than the sixth set value, the PID controller sends a fourth override action instruction to the temperature control valve, the fourth override action instruction includes a third override action amount and a fourth override action amount, the sixth set value is less than the fourth set value, and the temperature control valve adjusts the valve opening according to the third override action amount and the fourth override action amount included in the fourth override action instruction, wherein the temperature control valve adjusts the valve opening according to a weighted result of the third override action amount and the fourth override action amount.

Images