1. A method for generating an opening command, applied to a sliding window filter, the method comprising:

acquiring prestored change time of the opening of the actuating mechanism from 0 to 100% under the condition that the opening instruction of the actuating mechanism is input to change in a step from 0 to 100%;

receiving the opening control signal at the input end of the sliding window filter, and obtaining an output signal at the output end of the sliding window filter;

acquiring a deviation signal of the output signal and an opening signal output by the actuating mechanism according to the time for changing the opening of the actuating mechanism from 0 to 100%;

inputting the deviation signal into a proportional-integral controller to obtain a proportional-integral control signal;

and taking the proportional-integral control signal as the input opening command.

2. The method according to claim 1, wherein the sliding window filter satisfies the following relationship:

T_SWF＝T_0-100

wherein the SWF(s) is the sliding window filter transfer function, T_SWFIs the pre-stored time constant of the sliding window filter; t is_0-100The time for which the actuator opening degree changes from 0 to 100% is defined.

3. The opening degree command generation method according to claim 1, wherein the proportional-integral controller satisfies the following relationship:

wherein PI(s) is the proportional-integral controller transfer function. K_PIs a pre-stored gain of the proportional-integral controller; t is_IIs a pre-stored integration time constant of the proportional-integral controller.

4. The method for generating the opening command according to claim 1, wherein the actuator is an actuator of a reheat steam temperature flue gas damper.

5. An opening command generation device applied to a sliding window filter, the method comprising:

the change time acquisition module is used for acquiring the change time of the opening of the actuating mechanism from 0 to 100% when the pre-stored actuating mechanism is subjected to step change from 0 to 100% of the input opening instruction;

the output signal obtaining module is used for receiving the opening control signal and obtaining an output signal;

the deviation signal acquisition module is used for acquiring a deviation signal of the output signal and an opening signal output by the actuating mechanism according to the change time of the opening of the actuating mechanism from 0 to 100 percent;

the proportional-integral control signal obtaining module is used for inputting the deviation signal to a proportional-integral controller to obtain a proportional-integral control signal;

and the input opening instruction generation module is used for taking the proportional-integral control signal as the input opening instruction.

6. The opening degree command generation device according to claim 5, wherein the sliding window filter satisfies the following relationship:

T_SWF＝T_0-100

wherein the SWF(s) is the sliding window filter transfer function, T_SWFIs the pre-stored time constant of the sliding window filter; t is_0-100The time for which the actuator opening degree changes from 0 to 100% is defined.

7. The opening degree command generation device according to claim 5, wherein the proportional-integral controller satisfies the following relationship:

wherein PI(s) is the proportional-integral controller transfer function; k_PIs a pre-stored gain of the proportional-integral controller; t is_IIs a pre-stored integration time constant of the proportional-integral controller.

8. The device for generating the opening command according to claim 5, wherein the actuator is an actuator of a reheat steam temperature flue gas damper.

9. A terminal device, comprising:

one or more processors;

a memory coupled to the processor for storing one or more programs;

when the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the generation method of the opening degree instruction according to any one of claims 1 to 4.

10. A computer-readable storage medium on which a computer program is stored, the computer program being executed by a processor to implement the method of generating an opening degree instruction according to any one of claims 1 to 4.

Background

In the field of process control of thermal power generating units, various actuating mechanisms exist, such as an actuating mechanism of a reheated steam temperature flue gas baffle, an actuating mechanism of a steam temperature-reducing water valve and the like, and the actuating mechanisms are mainly used for controlling the opening of the reheated steam temperature flue gas baffle, the steam temperature-reducing water valve and the like to be an input opening instruction.

For example, for a superheated steam desuperheating water valve actuator, a 100 (step) opening degree command is input from 0, and the output opening degree of the superheated steam desuperheating water valve actuator, namely the opening degree of the superheated steam desuperheating water valve, is changed from 0 to 100% in 20 s. And if a 50 (step) opening command is input from 0, the change of the opening of the superheated steam temperature-reducing water valve from 0 to 50 percent may only need 10 s. It is considered that the time lag of the operation process of the actuator is different for different input opening degree command changes, that is, the actuator has different time lag characteristics for different input opening degree command changes, and the control performance of the control process is influenced from the overall viewpoint. The prior art can not avoid different time lag characteristics when an opening degree instruction is input.

Disclosure of Invention

The technical problem to be solved by the embodiments of the present invention is to solve the problem that the prior art cannot avoid different time lag characteristics when an opening command is input.

In order to solve the above problem, an embodiment of the present invention provides a method for generating an opening command, which is applied to a sliding window filter, where the method includes:

acquiring prestored change time of the opening of the actuating mechanism from 0 to 100% under the condition that the opening instruction of the actuating mechanism is input to change in a step from 0 to 100%;

receiving the opening control signal at the input end of the sliding window filter, and obtaining an output signal at the output end of the sliding window filter;

acquiring a deviation signal of the output signal and an opening signal output by the actuating mechanism according to the time for changing the opening of the actuating mechanism from 0 to 100%;

inputting the deviation signal into a proportional-integral controller to obtain a proportional-integral control signal;

and taking the proportional-integral control signal as the input opening command.

Optionally, the sliding window filter satisfies the following relationship:

T_SWF＝T_0-100

wherein the SWF(s) is the sliding window filter transfer function, T_SWFIs the pre-stored time constant of the sliding window filter. T is_0-100The time for which the actuator opening degree changes from 0 to 100% is defined.

Optionally, the proportional-integral controller satisfies the following relationship:

wherein PI(s) is the proportional-integral controller transfer function. K_PIs a pre-stored gain of the proportional-integral controller. T is_IIs a pre-stored integration time constant of the proportional-integral controller.

Optionally, the actuating mechanism is an actuating mechanism of the reheated steam temperature flue gas baffle.

An opening instruction generation device is applied to a sliding window filter, and the method comprises the following steps:

the change time acquisition module is used for acquiring the change time of the opening of the actuating mechanism from 0 to 100% when the pre-stored actuating mechanism is subjected to step change from 0 to 100% of the input opening instruction;

the output signal obtaining module is used for receiving the opening control signal and obtaining an output signal;

the deviation signal acquisition module is used for acquiring a deviation signal of the output signal and an opening signal output by the actuating mechanism according to the change time of the opening of the actuating mechanism from 0 to 100 percent;

the proportional-integral control signal obtaining module is used for inputting the deviation signal to a proportional-integral controller to obtain a proportional-integral control signal;

and the input opening instruction generation module is used for taking the proportional-integral control signal as the input opening instruction.

Optionally, the sliding window filter satisfies the following relationship:

T_SWF＝T_0-100

wherein the SWF(s) is the sliding window filter transfer function, T_SWFIs the pre-stored time constant of the sliding window filter. T is_0-100The time for which the actuator opening degree changes from 0 to 100% is defined.

Optionally, the proportional-integral controller satisfies the following relationship:

wherein PI(s) is the proportional-integral controller transfer function. K_PIs a pre-stored gain of the proportional-integral controller. T is_IIs a pre-stored integration time constant of the proportional-integral controller.

Optionally, the actuating mechanism is an actuating mechanism of the reheated steam temperature flue gas baffle.

A terminal device, comprising:

one or more processors;

a memory coupled to the processor for storing one or more programs;

when the one or more programs are executed by the one or more processors, the one or more processors implement the method for generating an opening degree instruction according to any one of the above.

A computer-readable storage medium having stored thereon a computer program for execution by a processor to implement the method of generating an opening degree instruction according to any one of the above.

Compared with the prior art, the method and the device for generating the opening command are applied to the sliding window filter, and the method comprises the following steps: the method comprises the steps of obtaining pre-stored time for changing the opening degree of an actuating mechanism from 0 to 100% under the condition that the actuating mechanism inputs a step change of the opening degree instruction from 0 to 100%, receiving an opening degree control signal, obtaining an output signal, obtaining a deviation signal of the output signal and the opening degree signal output by the actuating mechanism according to the time for changing the opening degree of the actuating mechanism from 0 to 100%, inputting the deviation signal to a proportional-integral controller, obtaining a proportional-integral control signal, and taking the proportional-integral control signal as the input opening degree instruction. The generated opening command takes into account the effect of the actuator having different time lag characteristics for different opening command changes.

Drawings

FIG. 1 is a flowchart illustrating steps of a method for generating an opening command according to an embodiment;

FIG. 2 is a schematic diagram of a method for generating an opening command of an actuator of a smoke damper according to an embodiment;

FIG. 3 is a graph of a flue gas damper opening signal versus time according to an embodiment;

FIG. 4 is a graph of a flue gas damper opening signal versus time provided by yet another embodiment;

fig. 5 is a schematic diagram illustrating an opening degree instruction generation device according to an embodiment.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the field of process control of thermal power generating units, various actuating mechanisms exist, such as an actuating mechanism of a reheated steam temperature flue gas baffle, an actuating mechanism of a steam temperature-reducing water valve and the like, and the actuating mechanisms are mainly used for controlling the opening of the reheated steam temperature flue gas baffle, the steam temperature-reducing water valve and the like to be an input opening instruction.

For example, for a superheated steam desuperheating water valve actuator, a 100 (step) opening degree command is input from 0, and the output opening degree of the superheated steam desuperheating water valve actuator, namely the opening degree of the superheated steam desuperheating water valve, is changed from 0 to 100% in 20 s. And if a 50 (step) opening command is input from 0, the change of the opening of the superheated steam temperature-reducing water valve from 0 to 50 percent may only need 10 s. It is considered that the time lag of the operation process of the actuator is different for different input opening degree command changes, that is, the actuator has different time lag characteristics for different input opening degree command changes, and the control performance of the control process is influenced from the overall viewpoint.

The actuators are divided into electric actuators and pneumatic actuators. The pneumatic actuator needs to be matched with complex systems, such as an air compressor, an air storage tank, a purification device, an air source pipeline and the like. In practice, an electric actuator is often used, and the electric actuator is characterized in that the output opening degree and the time are in a linear relationship and approximate to the output characteristic of a Sliding Window Filter (SWF). As will be described below, the actuator of the present invention is an electric actuator.

In order to solve the above problem, as shown in fig. 1, a flowchart of steps of a method for generating an opening degree instruction, which is applied to a sliding window filter, is provided, where the method includes the following steps:

step 101, acquiring the change time of the opening of an actuator from 0 to 100% when the actuator stored in advance inputs a step change of the opening instruction from 0 to 100%, wherein the actuator is an actuator of a reheat steam temperature flue gas baffle.

In the prior art, when a reheating steam temperature flue gas baffle control system is designed, the longer time of the 0-100% change of the output opening of an actuating mechanism of the existing reheating steam temperature flue gas baffle is not considered, and the actuating mechanism has different time lag characteristics for different opening instruction changes, thereby having adverse effects on the control quality of the reheating steam temperature.

Step 102, receiving an opening control signal and obtaining an output signal;

103, acquiring a deviation signal of the output signal and an opening signal output by the actuating mechanism according to the time for changing the opening of the actuating mechanism from 0 to 100%;

in an embodiment of the present invention, the sliding window filter satisfies the following relationship:

T_SWF＝T_0-100

wherein the SWF(s) is the sliding window filter transfer function, T_SWFIs the pre-stored time constant of the sliding window filter. T is_0-100The time for which the actuator opening degree changes from 0 to 100% is defined.

Step 104, inputting the deviation signal to a proportional-integral controller to obtain a proportional-integral control signal;

in an embodiment of the present invention, the proportional-integral controller satisfies the following relationship:

wherein PI(s) is the proportional-integral controller transfer function. K_PIs a pre-stored gain of the proportional-integral controller. T is_IIs a pre-stored integration time constant of the proportional-integral controller.

And 105, taking the proportional-integral control signal as the input opening command.

Compared with the prior art, the method for generating the opening instruction is applied to a sliding window filter, and comprises the following steps: the method comprises the steps of obtaining pre-stored time for changing the opening degree of an actuating mechanism from 0 to 100% under the condition that the actuating mechanism inputs a step change of the opening degree instruction from 0 to 100%, receiving an opening degree control signal, obtaining an output signal, obtaining a deviation signal of the output signal and the opening degree signal output by the actuating mechanism according to the time for changing the opening degree of the actuating mechanism from 0 to 100%, inputting the deviation signal to a proportional-integral controller, obtaining a proportional-integral control signal, and taking the proportional-integral control signal as the input opening degree instruction. The generated opening command takes into account the effect of the actuator having different time lag characteristics for different opening command changes.

To facilitate understanding of the above embodiments, as shown in fig. 2, the following description is a schematic diagram of a method for generating an opening command of an actuator of a flue gas damper, and the method includes sending an opening control signal to a sliding window filter, the sliding window filter generating an output signal (i.e. receiving the opening control signal and obtaining the output signal), sending the output signal and an opening signal output by the actuator of the flue gas damper to a subtractor (i.e. obtaining a deviation signal of the output signal and the opening signal output by the actuator according to a time of change of the opening of the actuator from 0 to 100%), generating a deviation signal according to the output signal and the opening signal output by the actuator of the flue gas damper by the subtractor, sending the deviation signal to a proportional-integral controller, generating a proportional-integral control signal (i.e. inputting the deviation signal to the proportional-integral controller, obtaining a proportional-integral control signal), and sending the proportional-integral control signal as an input opening instruction (i.e. the proportional-integral control signal is used as the input opening instruction) to an actuating mechanism of the flue gas baffle.

In one embodiment, as shown in fig. 3, the actuator of the flue gas damper obtains the time T for the opening of the flue gas damper to change from 0 to 100% under the condition of inputting a step change of the opening instruction from 0 to 100%_0-10040 s. The experimental result of the change of the opening degree of the flue gas baffle is obtained when the actuating mechanism of the flue gas baffle inputs the change of the opening degree command from 0 to 100% (step) and from 0 to 50% (step), and obviously, the lag time of the change of the opening degree of the flue gas baffle from 0 to 100% is different from the lag time of the change of the opening degree of the flue gas baffle from 0 to 50%.

Setting the sliding window filter time constant T_SWF40s, gain K of the proportional-integral controller_P2.5, the integration time constant T of the proportional-integral controller_I2.8 s. The experimental results of the opening change of the flue gas damper are obtained under the conditions that the opening control signal changes from 0 to 50% (step) and from 0 to 100% (step), and are shown in fig. 4.

As shown in fig. 4, the characteristic of the method that the opening control signal changes from 0 to 100% is delayed relative to the characteristic that the actuator of the smoke damper changes from 0 to 100% when the opening command is input, which is determined by the contradiction of things. However, compared with the characteristic of the method that the opening degree control signal changes from 0 to 100%, the characteristic of the method that the opening degree control signal changes from 0 to 50% is basically unchanged on the basis of the time lag characteristic, namely, the problem that the execution mechanism has different time lag characteristics for different input opening degree command changes, and the control performance of the control process is influenced from the overall perspective is solved.

Referring to fig. 5, a device for generating an opening instruction according to an embodiment is shown, and is applied to a sliding window filter, where the method includes:

a change time acquiring module 401, configured to acquire, by change, a change time of an actuator opening from 0 to 100% when a prestored actuator opening instruction 0 to 100% is changed in a step;

an output signal obtaining module 402, configured to receive the opening degree control signal and obtain an output signal;

a deviation signal obtaining module 403, configured to obtain a deviation signal between the output signal and the opening signal output by the actuator according to a time period during which the opening of the actuator changes from 0 to 100%;

a proportional-integral control signal obtaining module 404, configured to input the deviation signal to a proportional-integral controller to obtain a proportional-integral control signal;

an input opening command generating module 405, configured to use the proportional-integral control signal as the input opening command.

In an embodiment of the present invention, the sliding window filter satisfies the following relationship:

T_SWF＝T_0-100

wherein the SWF(s) is the sliding window filter transfer function, T_SWFIs the pre-stored time constant of the sliding window filter. T is_0-100The time for which the actuator opening degree changes from 0 to 100% is defined.

In an embodiment of the present invention, the proportional-integral controller satisfies the following relationship:

wherein PI(s) is the proportional-integral controller transfer function. K_PIs a pre-stored gain of the proportional-integral controller. T is_IIs a pre-stored integration time constant of the proportional-integral controller.

In an embodiment of the invention, the actuating mechanism is an actuating mechanism of a reheated steam temperature flue gas baffle.

Compared with the prior art, the method for generating the opening instruction is applied to a sliding window filter, and comprises the following steps: the method comprises the steps of obtaining pre-stored time for changing the opening degree of an actuating mechanism from 0 to 100% under the condition that the actuating mechanism inputs a step change of the opening degree instruction from 0 to 100%, receiving an opening degree control signal, obtaining an output signal, obtaining a deviation signal of the output signal and the opening degree signal output by the actuating mechanism according to the time for changing the opening degree of the actuating mechanism from 0 to 100%, inputting the deviation signal to a proportional-integral controller, obtaining a proportional-integral control signal, and taking the proportional-integral control signal as the input opening degree instruction. The generated opening command takes into account the effect of the actuator having different time lag characteristics for different opening command changes.

An embodiment of the present invention further provides a terminal device, including:

one or more processors;

a memory coupled to the processor for storing one or more programs;

when the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the method for generating an opening degree instruction as described above.

The processor is used for controlling the overall operation of the terminal equipment so as to complete all or part of the steps of the opening degree instruction generation method. The memory is used to store various types of data to support operation at the terminal device, and these data may include, for example, instructions for any application or method operating on the terminal device, as well as application-related data. The Memory may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk, or optical disk.

The terminal Device may be implemented by one or more Application Specific 1 integrated circuits (AS 1C), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a controller, a microcontroller, a microprocessor, or other electronic components, and is configured to execute the method for generating the opening command according to any one of the embodiments and achieve the technical effects consistent with the above methods.

An embodiment of the present invention further provides a computer-readable storage medium including program instructions, which when executed by a processor implement the steps of the method for generating an opening degree instruction according to any one of the above embodiments. For example, the computer-readable storage medium may be the above-mentioned memory including program instructions, which are executable by a processor of a terminal device to perform the method for generating an opening degree instruction according to any one of the above-mentioned embodiments, and achieve the technical effects consistent with the above-mentioned method.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.