A proportional-integral separation calculation method based on DCS system

Abstract

The present invention discloses a proportional-integral separation calculation method based on a DCS system, which solves the technical problem of severe coupling between the proportional and integral calculation functions of a proportional-integral controller in the prior art. The method includes determining a mirror proportional-integral controller and an auxiliary proportional-integral controller with the same functions as the proportional-integral controller to be tested, inputting the input parameters, proportional parameters, and integral parameters of the proportional-integral controller to the mirror proportional-integral controller to obtain its output value, inputting the input parameters and proportional parameters of the proportional-integral controller to the auxiliary proportional-integral controller to obtain its output value, and calculating the difference between the output values ​​of the mirror proportional-integral controller and the auxiliary proportional-integral controller. The present invention brings intuitiveness, convenience, and rapidity to the optimization of the proportional-integral controller.

Description

Technical Field

[0001] The present invention specifically relates to a proportional-integral separation calculation method based on a DCS system, and belongs to the technical field of automatic control. Background Art

[0002] PID controller, or proportional-integral controller, consists of proportional unit P, integral unit I and unit D, and is mainly suitable for systems with basic linearity and dynamic characteristics that do not change with time.

[0003] Currently, the implementation of proportional-integral control strategies for thermal power plants primarily relies on a proportional-integral controller module to perform a composite calculation of the proportional and integral values ​​of the setpoint and measured values. This module then synthesizes the final proportional, integral, and calculated results and outputs them to a handheld controller to control the automatic operation of the equipment and system. However, as equipment and systems operate for extended periods, or when subjected to disturbances, previously set proportional-integral control parameters, such as proportional and integral, no longer meet existing operating conditions. Therefore, the proportional and integral parameters need to be optimized based on current operating conditions. However, this proportional-integral controller cannot separately calculate the output values ​​calculated based on the setpoint and measured values ​​for each control algorithm, resulting in a severe coupling between the proportional and integral calculations.

[0004] The applicant has discovered that the prior art has at least the following technical problems:

[0005] 1. In the prior art, the proportional-integral controller cannot separately calculate the output values ​​calculated based on the set value and the measured value under the proportional and integral control algorithms, and the calculation functions of the proportional and integral are severely coupled. Summary of the Invention

[0006] The purpose of the present invention is to provide a proportional-integral separation calculation method based on a DCS system to solve the technical problem that the proportional-integral controller in the prior art cannot separately calculate the output values ​​calculated based on the set value and the measured value under each control algorithm of the proportional and integral, and the calculation effects of the proportional and integral are seriously coupled.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] A proportional-integral separation calculation method based on a DCS system is provided. The method determines, based on a proportional-integral controller to be tested, a mirror proportional-integral controller and an auxiliary proportional-integral controller having the same functions as the proportional-integral controller to be tested. The method comprises the following steps:

[0009] S1, inputting the input parameter, the first operation parameter, and the second operation parameter of the proportional-integral controller to be tested into the mirror proportional-integral controller to obtain the output value of the mirror proportional-integral controller, and inputting the input parameter and the first operation parameter of the proportional-integral controller to be tested into the auxiliary proportional-integral controller to obtain the output value of the auxiliary proportional-integral controller;

[0010] S2, calculates the difference between the output value of the mirror proportional integral controller and the output value of the auxiliary proportional integral controller.

[0011] Furthermore, the proportional-integral operation method of the mirror proportional-integral controller and the auxiliary proportional-integral controller is the same as the proportional-integral operation method of the proportional-integral controller to be tested.

[0012] Furthermore, the models of the mirror proportional-integral controller and the auxiliary proportional-integral controller are the same as the model of the proportional-integral controller to be tested.

[0013] Furthermore, the input parameters include: set values ​​and measured values.

[0014] Furthermore, the first operating parameter is a proportional parameter, and the second operating parameter is an integral parameter.

[0015] Furthermore, the proportional parameter and the integral parameter are obtained by calculating the set value and the measured value.

[0016] Furthermore, the sub-steps of step S2 include:

[0017] S21, subtracting a conversion parameter from the output value of the auxiliary proportional-integral controller to obtain a second output value of the auxiliary proportional-integral controller;

[0018] S22, calculating a difference between an output value of the mirrored proportional-integral controller and a second output value of the auxiliary proportional-integral controller.

[0019] Furthermore, the value of the conversion parameter is equal to half of the output range of the proportional-integral controller to be tested.

[0020] Furthermore, in step S1 , the set value, the measured value, the proportional parameter, and the integral parameter are input into the corresponding input ports of the mirror proportional-integral controller and the auxiliary proportional-integral controller, respectively.

[0021] Based on the above technical solution, the embodiments of the present invention can produce at least the following technical effects:

[0022] (1) The present invention provides a proportional-integral separation calculation method based on a DCS system. Based on the set value and the measured value, the proportional and integral calculation functions are decoupled and coupled, and the respective output values ​​under the proportional and integral functions are split, and recorded and analyzed, thereby making the optimization of the PID parameter controller intuitive, convenient and rapid. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a flowchart of an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The present invention provides a proportional integral separation calculation method based on DCS system construction.

[0025] A proportional-integral separation calculation method based on a DCS system is provided. The method determines, based on a proportional-integral controller to be tested, a mirror proportional-integral controller and an auxiliary proportional-integral controller having the same functions as the proportional-integral controller to be tested. The method comprises the following steps:

[0026] S1, inputting the input parameter, the first operation parameter, and the second operation parameter of the proportional-integral controller to be tested into the mirror proportional-integral controller to obtain the output value of the mirror proportional-integral controller, and inputting the input parameter and the first operation parameter of the proportional-integral controller to be tested into the auxiliary proportional-integral controller to obtain the output value of the auxiliary proportional-integral controller;

[0027] S2, calculates the difference between the output value of the mirror proportional integral controller and the output value of the auxiliary proportional integral controller.

[0028] In a preferred embodiment of the present invention, the proportional-integral operation method of the mirror proportional-integral controller and the auxiliary proportional-integral controller is the same as the proportional-integral operation method of the proportional-integral controller to be tested.

[0029] In a preferred embodiment of the present invention, the models of the mirror proportional-integral controller and the auxiliary proportional-integral controller are the same as the model of the proportional-integral controller to be tested.

[0030] In a preferred embodiment of the present invention, the input parameters include: set values ​​and measured values.

[0031] In a preferred embodiment of the present invention, the first operating parameter is a proportional parameter, and the second operating parameter is an integral parameter.

[0032] In a preferred embodiment of the present invention, the proportional parameter and the integral parameter are obtained by calculating the set value and the measured value.

[0033] In a preferred embodiment of the present invention, the sub-steps of step S2 include:

[0034] S21, subtracting a conversion parameter from the output value of the auxiliary proportional-integral controller to obtain a second output value of the auxiliary proportional-integral controller;

[0035] S22, calculating a difference between an output value of the mirrored proportional-integral controller and a second output value of the auxiliary proportional-integral controller.

[0036] In a preferred embodiment of the present invention, the value of the conversion parameter is equal to half of the output range of the proportional-integral controller to be tested.

[0037] It should be understood that the role of the conversion parameter is to use the conversion parameter as the balance zero point of the new proportional action output. By subtracting a conversion parameter from the output value of the auxiliary proportional-integral controller, it is ensured that the output value of the auxiliary proportional-integral controller greater than 0 and less than the conversion parameter can be converted to a negative value, thereby ensuring the positive and reverse regulation of the proportion.

[0038] In a preferred embodiment of the present invention, the conversion parameter is set to 20.

[0039] In a preferred embodiment of the present invention, in step S1 , the set value, the measured value, the proportional parameter, and the integral parameter are input into the corresponding input ports of the mirror proportional-integral controller and the auxiliary proportional-integral controller, respectively.

[0040] It will be understood that the present invention is described by way of the preferred embodiment, and it will be appreciated by those skilled in the art that various changes or equivalent substitutions may be made to these features and this embodiment without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and this embodiment may be modified to adapt to specific circumstances without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A proportional-integral separation calculation method based on a DCS system, characterized in that: The method determines, based on the proportional-integral controller to be tested, a mirror proportional-integral controller and an auxiliary proportional-integral controller having the same functions as the proportional-integral controller to be tested, wherein the proportional-integral operation methods of the mirror proportional-integral controller and the auxiliary proportional-integral controller are the same as the proportional-integral operation method of the proportional-integral controller to be tested; Mirror The models of the proportional-integral controller and the auxiliary proportional-integral controller are the same as the model of the proportional-integral controller to be tested; The steps of the method include: S1, inputting the input parameter, first operation parameter, and second operation parameter of the proportional-integral controller to be tested into the mirror proportional-integral controller to obtain the output value of the mirror proportional-integral controller, inputting the input parameter and first operation parameter of the proportional-integral controller to be tested into the auxiliary proportional-integral controller to obtain the output value of the auxiliary proportional-integral controller; the first operation parameter is a proportional parameter, and the second operation parameter is an integral parameter; S2, calculating the difference between the output value of the mirror proportional integral controller and the output value of the auxiliary proportional integral controller; the sub-steps of step S2 include: S21, subtracting a conversion parameter from the output value of the auxiliary proportional-integral controller to obtain a second output value of the auxiliary proportional-integral controller; S22, calculating a difference between an output value of the mirrored proportional-integral controller and a second output value of the auxiliary proportional-integral controller.

2. The proportional-integral separation calculation method based on DCS system construction according to claim 1 is characterized in that: The input parameters include: set values ​​and measured values.

3. The proportional-integral separation calculation method based on DCS system construction according to claim 1 is characterized in that: The value of the conversion parameter is equal to half of the output range of the proportional-integral controller to be tested.

4. The proportional-integral separation calculation method based on DCS system construction according to claim 1 is characterized in that: In step S1 , a set value, a measured value, a proportional parameter, and an integral parameter are input into corresponding input ports of the mirror proportional-integral controller and the auxiliary proportional-integral controller, respectively.

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