A method and apparatus for condensate recirculation control system process set point handling

Abstract

The application discloses a condensate water recirculation control system process given treatment method and device, comprising: inputting a process given signal of a condensate water recirculation control system of a thermal power generating unit into a negative proportional controller; inputting an output signal of the negative proportional controller into a four-order inertia filter; inputting an output signal of the four-order inertia filter into a second-order inertia filter and a subtractor respectively; subtracting the output signal of the four-order inertia filter from the output signal of the second-order inertia filter to obtain a subtraction signal; and adding the process given signal and the subtraction signal to obtain an acceleration type fastest control system process given signal. By using the application, the acceleration type fastest control system of the condensate water recirculation control system can inhibit process overshoot, significantly reduce the regulation time, and improve the control performance of the acceleration type engineering fastest proportional-integral controller.

Description

Technical Field

[0001] This invention relates to the field of industrial process control, and more particularly to a process setpoint processing method and apparatus for a condensate recirculation control system. Background Technology

[0002] In industrial process control practice, engineering researchers have invented an accelerated engineering fastest proportional-integral (AEFPI) controller, which improves the performance of control systems. AEFPI is suitable for standalone use, and its performance improvement over proportional-integral (PI) control is sufficient.

[0003] In practice, it has been found that in high-order processes, such as condensate recirculation control systems in thermal power units, AEFPI control exhibits significant process overshoot, which is an inherent characteristic of AEFPI control. Large process overshoots are unacceptable in condensate recirculation control systems. Connecting a first-order inertial filter (FOIF) at the process setpoint effectively suppresses process overshoot. However, this simple approach significantly reduces the regulation performance of AEFPI control. Summary of the Invention

[0004] This invention provides a process setpoint processing method and apparatus for a condensate recirculation control system, which significantly improves the regulation performance of accelerated engineering maximum proportional-integral (AEFPI) control.

[0005] To achieve the above objectives, a first aspect of this application provides a process setpoint processing method for a condensate recirculation control system, comprising: The process input signal of the condensate recirculation control system of the thermal power unit is input into the negative proportional controller. The output signal of the negative proportional controller is input into a fourth-order inertial filter; The output signal of the fourth-order inertial filter is input into the second-order inertial filter and the subtractor, respectively; The output signal of the fourth-order inertial filter is subtracted from the output signal of the second-order inertial filter to obtain the subtraction signal. The process input signal is added to the subtraction signal to obtain the process input signal of the acceleration-type maximum speed control system.

[0006] In one possible implementation of the first aspect, the Laplace transfer function of the negative proportional controller is: in, f NPCO ( s ) is the Laplace transfer function of the negative proportional controller; K NPCO This is the gain of the negative proportional controller.

[0007] In one possible implementation of the first aspect, the Laplace transfer function of the fourth-order inertial filter is: in, f FOIF ( s Let be the Laplace transfer function of the fourth-order inertial filter; T FOIF is the time constant of the fourth-order inertial filter.

[0008] In one possible implementation of the first aspect, the Laplace transfer function of the second-order inertial filter is: in, f TOIF ( s Let be the Laplace transfer function of the second-order inertial filter; T TOIF is the time constant of the second-order inertial filter.

[0009] In one possible implementation of the first aspect, after adding the process setpoint signal to the subtraction signal to obtain the process setpoint signal for the acceleration-type top speed control system, the method further includes: The process input signal of the acceleration-type maximum speed control system is input into the AEFPI controller through the feedback unit.

[0010] A second aspect of this application provides a process input processing device for a condensate recirculation control system, comprising: a negative proportional controller, a fourth-order inertial filter, a second-order inertial filter, a subtractor, and an adder; an external process input signal source is connected to the input terminal of the negative proportional controller and the first input terminal of the adder; the output terminal of the negative proportional controller is connected to the input terminal of the fourth-order inertial filter; the output terminal of the fourth-order inertial filter is connected to the input terminal of the second-order inertial filter and the minuend terminal of the subtractor; the output terminal of the second-order inertial filter is connected to the subtrahend terminal of the subtractor; the output terminal of the subtractor is connected to the second input terminal of the adder; and the adder is connected to an external accelerated engineering maximum speed proportional-integral controller. The negative proportional controller receives and processes the process input signal from the condensate recirculation control system, and then inputs the processed negative proportional control signal into the fourth-order inertial filter. The fourth-order inertial filter inputs the fourth-order inertial filter signal to the input terminal of the second-order inertial filter and the minuend terminal of the subtractor, respectively. The second-order inertial filter inputs the second-order inertial filter signal to the subtraction terminal of the subtractor; The subtractor subtracts the fourth-order inertial filter signal from the second-order inertial filter signal to obtain the subtracted signal; The adder adds the process setpoint signal and the subtraction signal to obtain the process setpoint signal of the acceleration-type maximum speed control system.

[0011] In one possible implementation of the second aspect, the Laplace transfer function of the negative proportional controller is: in, f NPCO ( s ) is the Laplace transfer function of the negative proportional controller; K NPCO This is the gain of the negative proportional controller.

[0012] In one possible implementation of the second aspect, the Laplace transfer function of the fourth-order inertial filter is: in, f FOIF ( s Let be the Laplace transfer function of the fourth-order inertial filter; T FOIF is the time constant of the fourth-order inertial filter.

[0013] In one possible implementation of the second aspect, the Laplace transfer function of the second-order inertial filter is: in, f TOIF ( s Let be the Laplace transfer function of the second-order inertial filter; T TOIF is the time constant of the second-order inertial filter.

[0014] In one possible implementation of the second aspect, the output of the adder is connected to the AEFPI controller via a feedback unit; the process given signal of the acceleration-type maximum speed control system enters the AEFPI controller through the feedback unit.

[0015] Compared to existing technologies, this invention provides a method and apparatus for processing the process input signal of a condensate recirculation control system. The method involves five steps of processing: negative proportional control processing, fourth-order inertial filtering processing, second-order inertial filtering processing, subtraction processing, and addition processing. Specifically, the fourth-order and second-order inertial filtering processes reduce the process overshoot of the input signal, and the subtraction and sham addition processes further reduce the suppression effect of the fourth-order and second-order inertial filtering processes on the external AEFPI. Furthermore, the negative proportional control adjusts the signal range to ensure compatibility, thereby reducing oscillations. In summary, these five processing steps suppress process overshoot in the accelerated maximum speed control system of the condensate recirculation control system, significantly reduce settling time, lower process output oscillations, and improve the control performance of the accelerated engineering maximum speed proportional-integral controller. Attached Figure Description

[0016] Figure 1 This is a flowchart illustrating a given processing method for a condensate recirculation control system according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of an acceleration-type maximum speed control system according to an embodiment of the present invention; Figure 3 This is a simulation result diagram of the process output provided by an embodiment of the present invention; Figure 4 This is a simulation result diagram of another process output provided by an embodiment of the present invention; Figure 5 This is a schematic diagram of the process feed processing device of a condensate recirculation control system according to an embodiment of the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] During power generation, power plants require a large amount of cooling water to lower the unit temperature. This cooling water is heated after flowing through the units, forming condensate. Direct discharge of untreated condensate would waste water resources and pollute the environment. Therefore, treating and reusing condensate is an effective means of water conservation. However, some thermal power unit condensate recirculation control systems cannot tolerate large process overshoots, which reduces water utilization efficiency. Connecting a first-order inertial filter (FOIF) at the process setpoint effectively suppresses process overshoot. However, this simple approach significantly reduces the regulation performance of AEFPI control.

[0019] Please see Figure 1 This invention provides a process setpoint processing method for a condensate recirculation control system, comprising: S10. Input the process setpoint signal of the thermal power unit condensate recirculation control system into the negative proportional controller.

[0020] S11. Input the output signal of the negative proportional controller into the fourth-order inertial filter.

[0021] S12. Input the output signal of the fourth-order inertial filter into the second-order inertial filter and the subtractor respectively.

[0022] S13. Subtract the output signal of the fourth-order inertial filter from the output signal of the second-order inertial filter to obtain the subtraction signal.

[0023] S14. Add the process given signal to the subtraction signal to obtain the process given signal of the acceleration-type maximum speed control system.

[0024] This implementation is mainly applied to the accelerated maximum speed control system in the condensate recirculation control system. In the accelerated maximum speed control system, before the process setpoint signal of the heating steam temperature control system passes through the AEFPI controller, the process setpoint signal of the condensate recirculation control system is processed by the processing method provided in this embodiment to obtain the accelerated maximum speed control system process setpoint signal before being connected to the AEFPI controller. This can effectively reduce the process overshoot of the AEFPI controller and reduce the adjustment time.

[0025] Compared to existing technologies, this invention provides a method and apparatus for processing the process input signal of a condensate recirculation control system. The method involves five steps of processing: negative proportional control processing, fourth-order inertial filtering processing, second-order inertial filtering processing, subtraction processing, and addition processing. Specifically, the fourth-order and second-order inertial filtering processes reduce the process overshoot of the input signal, and the subtraction and sham addition processes further reduce the suppression effect of the fourth-order and second-order inertial filtering processes on the external AEFPI. Furthermore, the negative proportional control adjusts the signal range to ensure compatibility, thereby reducing oscillations. In summary, these five processing steps suppress process overshoot in the accelerated maximum speed control system of the condensate recirculation control system, significantly reduce settling time, lower process output oscillations, and improve the control performance of the accelerated engineering maximum speed proportional-integral controller.

[0026] For example, the Laplace transfer function of the negative proportional controller is: in, f NPCO ( s ) is the Laplace transfer function of the negative proportional controller; K NPCO This is the gain of the negative proportional controller.

[0027] For example, the Laplace transfer function of the fourth-order inertial filter is: in, f FOIF ( s Let be the Laplace transfer function of the fourth-order inertial filter; T FOIF is the time constant of the fourth-order inertial filter.

[0028] For example, the Laplace transfer function of the second-order inertial filter is: in, f TOIF ( s Let be the Laplace transfer function of the second-order inertial filter; T TOIF is the time constant of the second-order inertial filter.

[0029] In the above embodiment, the negative proportional control signal is first input to a fourth-order inertial filter, and the fourth-order inertial filter outputs a fourth-order inertial filter signal; then the fourth-order inertial filter signal is input to a second-order inertial filter, and the second-order inertial filter outputs a second-order inertial filter signal; then the process setpoint signal and the subtraction signal are added together to obtain the process setpoint signal of the accelerated engineering fastest control system (equivalent to a correction signal).

[0030] For example, after adding the process command signal and the subtraction signal to obtain the process command signal for the acceleration-type maximum speed control system, the method further includes: The process input signal of the acceleration-type maximum speed control system is input into the AEFPI controller through the feedback unit.

[0031] In one embodiment, the accelerated engineering maximum speed control system input to the process given signal is as follows: Figure 2 As shown.

[0032] AEFPI is: In the formula, f AEFPI (s) is the transfer function of AEFPI. K AEFPI Cascade proportional control gain, f AEFI (s) is the transfer function of the Acceleration Engineering Fastest Integrator (AEFI). f AEFTF (s) is the transfer function of the Acceleration Engineering Fastest Tracking Filter (AEFTF); T AEFI The time constant of AEFI is expressed in seconds. T AEFTF The time constant of AEFTF, in seconds; quantitatively T AEFI = T AEFTF .

[0033] The process can be as follows: In the formula, f P (s) is the transfer function of the process.

[0034] When the open-loop system phase is -150°, the open-loop system gain is equal to 0.5. Searching for the optimal parameters of AEFPI, the AEFPI parameters are obtained as follows: T AEFI =383s, K AEFPI =2.393; Before adopting the process setpoint method for the condensate recirculation control system of this invention, with a process setpoint of a unit step, the simulation results obtained were as follows: Figure 3 As shown.

[0035] like Figure 3 As shown, the process overshoot is 26.4% and the settling time is 917s.

[0036] The settling time refers to the time it takes for the process to reach a deviation of less than 5%.

[0037] In one embodiment, the parameters of the process setpoint correction method for the condensate recirculation control system of the present invention are set as follows: - K PO =-0.75, T FOIF =50s, T TOIF =50s; the simulation results obtained are as follows Figure 4 As shown.

[0038] Figure 4 As shown, the process overshoot is 0.9% and the settling time is 279s.

[0039] It can be seen that the process setpoint correction signal of the condensate recirculation control system of the present invention significantly reduces process overshoot, significantly reduces settling time, and effectively eliminates process oscillation problems.

[0040] Compared to existing technologies, this invention provides a process input processing device for a condensate recirculation control system. This device processes the process input signal of the condensate recirculation control system through five steps: negative proportional control processing, fourth-order inertial filtering processing, second-order inertial filtering processing, subtraction processing, and addition processing. Specifically, the fourth-order and second-order inertial filtering processes reduce the process overshoot of the process input signal, and the subtraction and sham addition processes further reduce the suppression effect of the fourth-order and second-order inertial filtering processes on the external AEFPI. Furthermore, the negative proportional control adjusts the signal range to ensure compatibility, thereby reducing oscillations. In summary, through these five processing steps, the accelerated maximum speed control system of the condensate recirculation control system suppresses process overshoot, significantly reduces settling time, lowers process output oscillations, and improves the control performance of the accelerated engineering maximum speed proportional-integral controller.

[0041] One embodiment of this application provides a process input processing device for a condensate recirculation control system, comprising: a negative proportional controller, a fourth-order inertial filter, a second-order inertial filter, a subtractor, and an adder.

[0042] An external process input signal source is connected to the input terminal of the negative proportional controller and the first input terminal of the adder, respectively; the output terminal of the negative proportional controller is connected to the input terminal of the fourth-order inertial filter; the output terminal of the fourth-order inertial filter is connected to the input terminal of the second-order inertial filter and the minuend terminal of the subtractor, respectively; the output terminal of the second-order inertial filter is connected to the subtrahend terminal of the subtractor; the output terminal of the subtractor is connected to the second input terminal of the adder; the adder is connected to an external accelerated engineering speed proportional-integral controller.

[0043] The negative proportional controller receives and processes the process input signal from the condensate recirculation control system, and then inputs the processed negative proportional control signal into the fourth-order inertial filter.

[0044] The fourth-order inertial filter inputs the fourth-order inertial filter signal to the input terminal of the second-order inertial filter and the minuend terminal of the subtractor, respectively.

[0045] The second-order inertial filter inputs the second-order inertial filter signal to the subtraction terminal of the subtractor.

[0046] The subtractor subtracts the fourth-order inertial filter signal from the second-order inertial filter signal to obtain the subtracted signal.

[0047] The adder adds the process setpoint signal and the subtraction signal to obtain the process setpoint signal of the acceleration-type maximum speed control system.

[0048] Compared to existing technologies, this invention provides a process input processing device for a condensate recirculation control system. This device processes the process input signal of the condensate recirculation control system through five steps: negative proportional control processing, fourth-order inertial filtering processing, second-order inertial filtering processing, subtraction processing, and addition processing. Specifically, the fourth-order and second-order inertial filtering processes reduce the process overshoot of the process input signal, and the subtraction and sham addition processes further reduce the suppression effect of the fourth-order and second-order inertial filtering processes on the external AEFPI. Furthermore, the negative proportional control adjusts the signal range to ensure compatibility, thereby reducing oscillations. In summary, through these five processing steps, the accelerated maximum speed control system of the condensate recirculation control system suppresses process overshoot, significantly reduces settling time, lowers process output oscillations, and improves the control performance of the accelerated engineering maximum speed proportional-integral controller.

[0049] For example, the Laplace transfer function of the negative proportional controller is: in, f NPCO ( s ) is the Laplace transfer function of the negative proportional controller; K NPCO This is the gain of the negative proportional controller.

[0050] For example, the Laplace transfer function of the fourth-order inertial filter is: in, f FOIF ( s () is the Laplace transfer function of a fourth-order inertial filter; T FOIF is the time constant of the fourth-order inertial filter.

[0051] For example, the Laplace transfer function of the second-order inertial filter is: in, f TOIF ( s Let be the Laplace transfer function of the second-order inertial filter; T TOIF is the time constant of the second-order inertial filter.

[0052] For example, the output of the adder is connected to the AEFPI controller via a feedback unit; the process input signal of the acceleration-type maximum speed control system enters the AEFPI controller through the feedback unit.

[0053] One embodiment of this application provides an electronic device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor executes the computer program to implement the condensate recirculation control system process given processing method as described above.

[0054] One embodiment of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the given processing method of the condensate recirculation control system as described above.

[0055] The computer device may be a smartphone, tablet, desktop computer, or cloud server, among other computing devices. This computer device may include, but is not limited to, a processor and memory. Those skilled in the art will understand that the figures are merely examples of computer devices and do not constitute a limitation on the computer device. It may include more or fewer components than illustrated, or a combination of certain components, or different components, such as input / output devices, network access devices, etc.

[0056] The processor referred to can be a Central Processing Unit (CPU), but it can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0057] In some embodiments, the memory may be an internal storage unit of the computer device, such as a hard drive or RAM. In other embodiments, the memory may be an external storage device of the computer device, such as a plug-in hard drive, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card. Furthermore, the memory may include both internal and external storage units of the computer device. The memory is used to store the operating system, applications, bootloader, data, and other programs, such as the program code of the computer program. The memory can also be used to temporarily store data that has been output or will be output.

[0058] This application provides a computer program product that, when run on a computer device, enables the computer device to execute the steps described in the various method embodiments above.

[0059] In the several embodiments provided in this application, it will be understood that each block in the flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those shown in the figures. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved.

[0060] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0061] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for processing a condensate recirculation control system process feed, characterized in that, include: The process input signal of the condensate recirculation control system of the thermal power unit is input into the negative proportional controller. The output signal of the negative proportional controller is input into a fourth-order inertial filter; The output signal of the fourth-order inertial filter is input into the second-order inertial filter and the subtractor, respectively; The output signal of the fourth-order inertial filter is subtracted from the output signal of the second-order inertial filter to obtain the subtraction signal. The process given signal is added to the subtraction signal to obtain the process given signal of the acceleration maximum speed control system. The process given signal of the acceleration maximum speed control system is then input into the AEFPI controller through the feedback unit. Specifically: the Laplace transfer function of the negative proportional controller is: in, f NPCO ( s ) is the Laplace transfer function of the negative proportional controller; K NPCO The gain of the negative proportional controller; The Laplace transfer function of the fourth-order inertial filter is: in, f FOIF ( s () is the Laplace transfer function of a fourth-order inertial filter; T FOIF The time constant of the fourth-order inertial filter; The Laplace transfer function of the second-order inertial filter is: in, f TOIF ( s Let be the Laplace transfer function of the second-order inertial filter; T TOIF is the time constant of the second-order inertial filter.

2. A process control device for condensate recirculation control system, characterized in that, include: The system comprises a negative proportional controller, a fourth-order inertial filter, a second-order inertial filter, a subtractor, and an adder. An external process input signal source is connected to the input terminal of the negative proportional controller and the first input terminal of the adder, respectively. The output terminal of the negative proportional controller is connected to the input terminal of the fourth-order inertial filter. The output terminal of the fourth-order inertial filter is connected to the input terminal of the second-order inertial filter and the minuend terminal of the subtractor, respectively. The output terminal of the second-order inertial filter is connected to the subtrahend terminal of the subtractor. The output terminal of the subtractor is connected to the second input terminal of the adder. The adder is connected to an external accelerated engineering speed proportional-integral controller. The negative proportional controller receives and processes the process input signal from the condensate recirculation control system, and then inputs the processed negative proportional control signal into the fourth-order inertial filter. The fourth-order inertial filter inputs the fourth-order inertial filter signal to the input terminal of the second-order inertial filter and the minuend terminal of the subtractor, respectively. The second-order inertial filter inputs the second-order inertial filter signal to the subtraction terminal of the subtractor; The subtractor subtracts the fourth-order inertial filter signal from the second-order inertial filter signal to obtain the subtracted signal; The adder adds the process given signal and the subtraction signal to obtain the process given signal of the acceleration maximum speed control system, and inputs the process given signal of the acceleration maximum speed control system into the AEFPI controller through the feedback unit; Specifically: the Laplace transfer function of the negative proportional controller is: in, f NPCO ( s ) is the Laplace transfer function of the negative proportional controller; K NPCO The gain of the negative proportional controller; The Laplace transfer function of the fourth-order inertial filter is: in, f FOIF ( s Let be the Laplace transfer function of the fourth-order inertial filter; T FOIF The time constant of the fourth-order inertial filter; The Laplace transfer function of the second-order inertial filter is: in, f TOIF ( s Let be the Laplace transfer function of the second-order inertial filter; T TOIF is the time constant of the second-order inertial filter.

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