CN114384797B - Steam temperature control method for thermal power plant - Google Patents
Steam temperature control method for thermal power plant Download PDFInfo
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- CN114384797B CN114384797B CN202210006043.5A CN202210006043A CN114384797B CN 114384797 B CN114384797 B CN 114384797B CN 202210006043 A CN202210006043 A CN 202210006043A CN 114384797 B CN114384797 B CN 114384797B
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 239000000446 fuel Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 230000007547 defect Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D.
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Feedback Control In General (AREA)
Abstract
The invention discloses a steam temperature control method of a thermal power plant, which comprises the following steps: A. establishing a first PID controller and a second PID controller, wherein the control object of the first PID controller is the main steam temperature of the unit, and the control object of the second PID controller is the average exhaust gas temperature; B. the average exhaust gas temperature is used for carrying out feedforward control on the main steam temperature of the unit; C. and correcting the main steam temperature of the unit by using the flow rate of the desuperheating water, the fuel input amount and the burner angle. The invention can improve the defects of the prior art and improve the robustness of steam temperature control.
Description
Technical Field
The invention relates to the technical field of power plant automation, in particular to a steam temperature control method of a thermal power plant.
Background
Steam is a power source for the steam turbine to do work, and steam temperature is one of important factors affecting the power generation efficiency of the thermal power generating unit. Because the control factors of the steam temperature are more, the control system of the steam temperature in the prior art is more complex, and the robustness of the system is generally not high, so that the problem of inaccurate steam temperature control due to temporary fluctuation of the working condition is easily caused under the actual working condition.
Disclosure of Invention
The invention aims to provide a steam temperature control method for a thermal power plant, which can solve the defects in the prior art and improve the robustness of steam temperature control.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows.
A steam temperature control method of a thermal power plant comprises the following steps:
A. establishing a first PID controller and a second PID controller, wherein the control object of the first PID controller is the main steam temperature of the unit, and the control object of the second PID controller is the average exhaust gas temperature;
B. the average exhaust gas temperature is used for carrying out feedforward control on the main steam temperature of the unit;
C. and correcting the main steam temperature of the unit by using the flow rate of the desuperheating water, the fuel input amount and the burner angle.
Preferably, in the step a, an association relation function of the main steam temperature and the average exhaust gas temperature of the unit is established, and the association relation function is used for processing the parameter setting result of the first PID controller, and the processing result is used as a preset reference value for parameter setting of the second PID controller.
Preferably, in the step B, a corresponding feedforward control proportion is set according to a deviation between the main steam temperature of the unit and a preset value, and the feedforward control data and the corresponding feedforward control proportion are weighted and then the main steam temperature of the unit is subjected to feedforward control.
Preferably, the feedforward control priority of the step B is higher than the feedback control priority of the first PID controller, and the feedback control of the first PID controller is suspended when the feedforward control is performed, and the feedback control of the first PID controller is performed after each round of feedforward control is completed.
Preferably, in the step C, real-time influence factors of the flow rate of the desuperheating water, the fuel input amount and the burner angle on the main steam temperature of the unit are calculated, and a correction term with the largest influence factor is selected to correct the main steam temperature of the unit.
Preferably, in step C, a minimum correction amount threshold is set, and when the correction amount to be executed is smaller than the minimum correction amount threshold, the current correction operation is stopped.
The beneficial effects brought by adopting the technical scheme are as follows: according to the invention, different operation parameters of the generator set are integrated, so that the control strategy is optimized, unnecessary control links are reduced, the robustness of the control flow is effectively improved, and the accuracy of steam temperature control can be ensured when the generator set has working condition disturbance.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
Referring to fig. 1, one embodiment of the present invention includes the steps of:
A. establishing a first PID controller and a second PID controller, wherein the control object of the first PID controller is the main steam temperature of the unit, and the control object of the second PID controller is the average exhaust gas temperature;
B. the average exhaust gas temperature is used for carrying out feedforward control on the main steam temperature of the unit;
C. and correcting the main steam temperature of the unit by using the flow rate of the desuperheating water, the fuel input amount and the burner angle.
In the step A, an association relation function of the main steam temperature and the average exhaust gas temperature of the unit is established, and the association relation function is used for processing the parameter setting result of the first PID controller, wherein the processing result is used as a preset reference value for parameter setting of the second PID controller.
And B, setting a corresponding feedforward control proportion according to the deviation between the main steam temperature of the unit and a preset value, weighting feedforward control data and the corresponding feedforward control proportion, and then performing feedforward control on the main steam temperature of the unit.
And B, the feedforward control priority is higher than the feedback control priority of the first PID controller, the feedback control of the first PID controller is suspended when the feedforward control is performed, and the feedback control of the first PID controller is performed after each round of feedforward control is finished.
And C, respectively calculating real-time influence factors of the flow of the desuperheating water, the fuel input amount and the burner angle on the main steam temperature of the unit, and selecting a correction item with the largest influence factor to correct the main steam temperature of the unit.
In step C, a minimum correction amount threshold is set, and when the correction amount to be executed is smaller than the minimum correction amount threshold, the current correction operation is stopped.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. The steam temperature control method of the thermal power plant is characterized by comprising the following steps of:
A. establishing a first PID controller and a second PID controller, wherein the control object of the first PID controller is the main steam temperature of the unit, and the control object of the second PID controller is the average exhaust gas temperature; establishing an association relation function of the main steam temperature and the average exhaust gas temperature of the unit, and processing a parameter setting result of the first PID controller by using the association relation function, wherein the processing result is used as a preset reference value for parameter setting of the second PID controller;
B. the average exhaust gas temperature is used for carrying out feedforward control on the main steam temperature of the unit; setting corresponding feedforward control proportion according to deviation between the main steam temperature of the unit and a preset value, weighting feedforward control data and the corresponding feedforward control proportion, and then performing feedforward control on the main steam temperature of the unit; the feedforward control priority is higher than the feedback control priority of the first PID controller, the feedback control of the first PID controller is suspended when the feedforward control is performed, the time delay is performed after the feedforward control of each round is finished, and the feedback control of the first PID controller is performed;
C. and correcting the main steam temperature of the unit by using the flow rate of the desuperheating water, the fuel input amount and the burner angle.
2. The thermal power plant steam temperature control method according to claim 1, wherein: and C, respectively calculating real-time influence factors of the flow of the desuperheating water, the fuel input amount and the burner angle on the main steam temperature of the unit, and selecting a correction item with the maximum real-time influence factor to correct the main steam temperature of the unit.
3. The thermal power plant steam temperature control method according to claim 2, characterized in that: in step C, a minimum correction amount threshold is set, and when the correction amount to be executed is smaller than the minimum correction amount threshold, the current correction operation is stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210006043.5A CN114384797B (en) | 2022-01-05 | 2022-01-05 | Steam temperature control method for thermal power plant |
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| CN202210006043.5A CN114384797B (en) | 2022-01-05 | 2022-01-05 | Steam temperature control method for thermal power plant |
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| CN114384797A CN114384797A (en) | 2022-04-22 |
| CN114384797B true CN114384797B (en) | 2024-03-22 |
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