CN113094896B - Power plant heat supply unit optimization control method - Google Patents
Power plant heat supply unit optimization control method Download PDFInfo
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- CN113094896B CN113094896B CN202110371043.0A CN202110371043A CN113094896B CN 113094896 B CN113094896 B CN 113094896B CN 202110371043 A CN202110371043 A CN 202110371043A CN 113094896 B CN113094896 B CN 113094896B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
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Abstract
The invention discloses an optimal control method for a heat supply unit of a power plant, which comprises the following steps: A. determining rated power, a main steam temperature interval, a main steam pressure interval, an exhaust temperature interval and a heat supply flow interval of a steam turbine; B. respectively adopting a single variable mode to carry out experiments on the main steam temperature, the main steam pressure, the exhaust temperature and the heat supply flow to obtain real-time power curves of the steam turbine in different states; C. establishing a PID regulator of the turbine power aiming at each turbine real-time power curve; D. and C, controlling the temperature of the main steam, the pressure of the main steam, the exhaust temperature and the heat supply flow by the PID regulator established in the step C. The invention can improve the defects of the prior art and improve the economical efficiency and the stability of the operation of the heat supply unit of the power plant.
Description
Technical Field
The invention relates to the technical field of power plant automation, in particular to an optimal control method for a heat supply unit of a power plant.
Background
Along with the development of the electric power industry in China, the capacity of a power grid is gradually enlarged, the peak-to-valley difference of the electric load is increased, the peak-to-valley difference reaches 30% -50% of the highest load, and particularly during winter heat supply, along with the increase of heat supply requirements, the influence on the operation condition of the whole heat supply unit is more obvious. During the process of large-range load change, the operation working conditions of the steam turbine are changed greatly, so that the operation economy and the stability are poor.
Disclosure of Invention
The invention aims to provide an optimal control method for a heat supply unit of a power plant, which can overcome the defects of the prior art and improve the economical efficiency and stability of the operation of the heat supply unit.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows.
A power plant heating unit optimization control method comprises the following steps:
A. determining rated power, a main steam temperature interval, a main steam pressure interval, an exhaust temperature interval and a heat supply flow interval of a steam turbine;
B. respectively adopting a single variable mode to carry out experiments on the main steam temperature, the main steam pressure, the exhaust temperature and the heat supply flow to obtain real-time power curves of the steam turbine in different states;
C. establishing a PID regulator of the turbine power aiming at each turbine real-time power curve;
D. and C, controlling the main steam temperature, the main steam pressure, the exhaust temperature and the heat supply flow by the PID regulator established in the step C.
Preferably, in step B, the variation of the single variable in the single variable experiment includes a linear variation and a non-linear variation.
Preferably, in the step B, the real-time power curve of the steam turbine is clustered according to the test result, and the curve in each class is fitted to obtain the fitted real-time power curve of the steam turbine.
Preferably, in step C, the PID regulator for establishing the turbine power comprises the steps of,
c1, selecting a plurality of detection points on a real-time power curve of the steam turbine;
c2, selecting initial parameters of the PID regulator according to the detection point data;
and C3, setting the initial parameters of the PID regulator to obtain the optimal parameters.
Preferably, in the step C1, the real-time power curve of the steam turbine is segmented, the power curve of each segment is monotonous, at least two detection points are selected from the power curve of each segment, and the power deviation between the two detection points closest to each other on the adjacent power curve segments is less than 5% of the rated power.
Preferably, in step C3,
firstly, giving a plurality of selectable values of the proportional link coefficient, inputting detection point data into a PID regulator, traversing all the selectable values of the proportional link coefficient, and selecting the selectable value of the proportional link coefficient corresponding to the highest linearity output by the PID regulator as the optimal value of the proportional link coefficient;
then, giving a minimum value of a differential link coefficient, inputting a disturbance signal to a PID regulator, and gradually increasing the differential link coefficient until the output oscillation period of the PID regulator is smaller than a set threshold value, wherein the differential link coefficient at the moment is used as an optimal value of the differential link coefficient;
and finally, selecting the optimal value of the coefficient of the integral link by taking the highest linearity of the output of the PID regulator and the real-time power curve of the steam turbine as a target.
Preferably, after the optimal parameters are obtained, the most significant parameters are finely adjusted by using a trial and error method.
Preferably, the controlling of the main steam temperature, the main steam pressure and the exhaust gas temperature in step D includes the steps of,
according to the target power of the steam turbine, target main steam pressure and target heat supply flow are selected, then the opening degree of each speed regulating valve is changed, and the main steam temperature and the exhaust temperature are stabilized in a high-efficiency interval while the actual power of the steam turbine is stabilized at the target power.
Preferably, in the step D, the oscillation generated in the system is suppressed in the process of controlling the temperature of the main steam, the pressure of the main steam and the temperature of the exhaust gas, and the method comprises the following steps,
d1, selecting an oscillation monitoring frequency interval and monitoring a valve body object;
d2, establishing an oscillation monitoring frequency interval and a correlation function for monitoring a valve body object;
d3, judging whether oscillation occurs according to the frequency monitoring result, and if oscillation occurs, adjusting the valve position by using the associated valve body to inhibit oscillation.
Preferably, the valve position adjustment limit interval of the monitoring valve body is set.
Adopt the beneficial effect that above-mentioned technical scheme brought to lie in: according to the invention, the design thought of the system regulator is improved, the system control parameters are effectively optimized, the operation efficiency of the whole steam turbine system is improved, and the operation risk is reduced.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
Example 1
A power plant heating unit optimization control method comprises the following steps:
A. determining rated power, a main steam temperature interval, a main steam pressure interval, an exhaust temperature interval and a heat supply flow interval of a steam turbine;
B. respectively adopting a single variable mode to carry out experiments on the main steam temperature, the main steam pressure, the exhaust temperature and the heat supply flow to obtain real-time power curves of the steam turbine in different states;
C. establishing a PID regulator of the turbine power aiming at each turbine real-time power curve;
D. and C, controlling the temperature of the main steam, the pressure of the main steam, the exhaust temperature and the heat supply flow by the PID regulator established in the step C.
In step C, the PID regulator for establishing the turbine power comprises the following steps,
c1, selecting a plurality of detection points on a real-time power curve of the steam turbine;
c2, selecting initial parameters of the PID regulator according to the detection point data;
and C3, setting the initial parameters of the PID regulator to obtain the optimal parameters.
In the step D, the step of controlling the temperature of the main steam, the pressure of the main steam, the exhaust temperature and the heat supply flow comprises the following steps,
according to the target power of the steam turbine, target main steam pressure and target heat supply flow are selected, then the opening degree of each speed regulating valve is changed, and the main steam temperature and the exhaust temperature are stabilized in a high-efficiency interval while the actual power of the steam turbine is stabilized at the target power.
Example 2
A method for optimally controlling a heat supply unit of a power plant comprises the following steps:
A. determining rated power, a main steam temperature interval, a main steam pressure interval, an exhaust temperature interval and a heat supply flow interval of a steam turbine;
B. respectively adopting a single variable mode to carry out experiments on the main steam temperature, the main steam pressure, the exhaust temperature and the heat supply flow to obtain real-time power curves of the steam turbine in different states;
C. establishing a PID regulator of the turbine power aiming at each turbine real-time power curve;
D. and C, controlling the temperature of the main steam, the pressure of the main steam, the exhaust temperature and the heat supply flow by the PID regulator established in the step C.
In step B, when a single variable experiment is performed, the variation of the single variable includes linear variation and nonlinear variation.
And step B, clustering the real-time power curve of the steam turbine according to the test result, and fitting the curve in each class to obtain the fitted real-time power curve of the steam turbine.
In step C, the PID regulator for establishing the turbine power comprises the following steps,
c1, selecting a plurality of detection points on a real-time power curve of the steam turbine;
c2, selecting initial parameters of the PID regulator according to the detection point data;
and C3, setting the initial parameters of the PID regulator to obtain the optimal parameters.
In the step D, the step of controlling the temperature of the main steam, the pressure of the main steam, the exhaust temperature and the heat supply flow comprises the following steps,
according to the target power of the steam turbine, target main steam pressure and target heat supply flow are selected, then the opening degree of each speed regulating valve is changed, and the main steam temperature and the exhaust temperature are stabilized in a high-efficiency interval while the actual power of the steam turbine is stabilized at the target power.
Compared with the embodiment 1, the embodiment 2 reduces the number of the real-time power curves of the steam turbine by optimizing the acquisition process of the real-time power curves of the steam turbine, thereby reducing the calculation amount of post-processing.
Example 3
A power plant heating unit optimization control method comprises the following steps:
A. determining rated power, a main steam temperature interval, a main steam pressure interval, an exhaust temperature interval and a heat supply flow interval of a steam turbine;
B. respectively carrying out experiments on the main steam temperature, the main steam pressure, the exhaust temperature and the heat supply flow in a single variable mode to obtain real-time power curves of the steam turbine in different states;
C. establishing a PID regulator of the turbine power aiming at each turbine real-time power curve;
D. and C, controlling the temperature of the main steam, the pressure of the main steam, the exhaust temperature and the heat supply flow by the PID regulator established in the step C.
In the step B, when a single variable experiment is carried out, the change of the single variable comprises linear change and nonlinear change.
And step B, clustering the real-time power curve of the steam turbine according to the test result, and fitting the curve in each class to obtain the fitted real-time power curve of the steam turbine.
In step C, the PID regulator for establishing the turbine power comprises the following steps,
c1, selecting a plurality of detection points on a real-time power curve of the steam turbine;
c2, selecting initial parameters of the PID regulator according to the detection point data;
and C3, setting the initial parameters of the PID regulator to obtain the optimal parameters.
And C1, segmenting the real-time power curve of the steam turbine, wherein each segment of power curve keeps monotonicity, at least two detection points are selected on each segment of power curve, and the power deviation of the two detection points closest to each other on the adjacent segments of power curve is less than 5% of rated power.
In the step C3, the step C is carried out,
firstly, giving a plurality of selectable values of the proportional link coefficient, inputting detection point data into a PID regulator, traversing all the selectable values of the proportional link coefficient, and selecting the selectable value of the proportional link coefficient corresponding to the highest linearity output by the PID regulator as the optimal value of the proportional link coefficient;
then, giving a minimum value of a differential link coefficient, inputting a disturbance signal to a PID regulator, and gradually increasing the differential link coefficient until the output oscillation period of the PID regulator is smaller than a set threshold value, wherein the differential link coefficient at the moment is used as an optimal value of the differential link coefficient;
and finally, selecting an optimal value of the coefficient of the integral link by taking the highest linearity of the output of the PID regulator and the real-time power curve of the steam turbine as a target.
And after the optimal parameters are obtained, fine adjustment is carried out on the most parameters by using a trial and error method.
In the step D, the step of controlling the temperature of the main steam, the pressure of the main steam, the exhaust temperature and the heat supply flow comprises the following steps,
according to the target power of the steam turbine, the target main steam pressure and the target heat supply flow are selected, then the opening degree of each speed regulation valve is changed, and the main steam temperature and the exhaust temperature are stabilized in a high-efficiency interval while the actual power of the steam turbine is stabilized at the target power.
Compared with the embodiment 2, the embodiment 3 further improves the stability of the system operation by optimizing the parameters of the PID regulator.
Example 4
A method for optimally controlling a heat supply unit of a power plant comprises the following steps:
A. determining rated power, a main steam temperature interval, a main steam pressure interval, an exhaust temperature interval and a heat supply flow interval of a steam turbine;
B. respectively adopting a single variable mode to carry out experiments on the main steam temperature, the main steam pressure, the exhaust temperature and the heat supply flow to obtain real-time power curves of the steam turbine in different states;
C. establishing a PID regulator of the turbine power aiming at each turbine real-time power curve;
D. and C, controlling the temperature of the main steam, the pressure of the main steam, the exhaust temperature and the heat supply flow by the PID regulator established in the step C.
In step B, when a single variable experiment is performed, the variation of the single variable includes linear variation and nonlinear variation.
And step B, clustering the real-time power curve of the steam turbine according to the test result, and fitting the curve in each class to obtain the fitted real-time power curve of the steam turbine.
In step C, the PID regulator for establishing the turbine power comprises the following steps,
c1, selecting a plurality of detection points on a real-time power curve of the steam turbine;
c2, selecting initial parameters of the PID regulator according to the detection point data;
and C3, setting the initial parameters of the PID regulator to obtain the optimal parameters.
And C1, segmenting the real-time power curve of the steam turbine, wherein each segment of power curve keeps monotonicity, at least two detection points are selected on each segment of power curve, and the power deviation of the two detection points closest to each other on the adjacent segments of power curve is less than 5% of rated power.
In the step C3, the step C is carried out,
firstly, giving a plurality of selectable values of the proportional link coefficients, inputting detection point data into a PID regulator, traversing all the selectable values of the proportional link coefficients, and selecting the selectable value of the proportional link coefficient corresponding to the highest linearity output by the PID regulator as the optimal value of the proportional link coefficient;
then, giving a minimum value of a differential link coefficient, inputting a disturbance signal to a PID regulator, and gradually increasing the differential link coefficient until the output oscillation period of the PID regulator is smaller than a set threshold value, wherein the differential link coefficient at the moment is used as an optimal value of the differential link coefficient;
and finally, selecting the optimal value of the coefficient of the integral link by taking the highest linearity of the output of the PID regulator and the real-time power curve of the steam turbine as a target.
And after the optimal parameters are obtained, fine adjustment is carried out on the most parameters by using a trial and error method.
In the step D, the step of controlling the temperature of the main steam, the pressure of the main steam, the exhaust temperature and the heat supply flow comprises the following steps,
according to the target power of the steam turbine, target main steam pressure and target heat supply flow are selected, then the opening degree of each speed regulating valve is changed, and the main steam temperature and the exhaust temperature are stabilized in a high-efficiency interval while the actual power of the steam turbine is stabilized at the target power.
In the step D, the oscillation generated by the system is inhibited in the process of controlling the temperature of the main steam, the pressure of the main steam, the exhaust temperature and the heat supply flow, and the method comprises the following steps,
d1, selecting an oscillation monitoring frequency interval and monitoring a valve body object;
d2, establishing an oscillation monitoring frequency interval and a correlation function for monitoring a valve body object;
d3, judging whether oscillation occurs according to the frequency monitoring result, and if oscillation occurs, adjusting the valve position by using the associated valve body to inhibit oscillation.
And setting a valve position adjusting and limiting interval of the monitoring valve body.
Compared with embodiment 3, embodiment 4 further improves the stability of the system operation by suppressing the oscillation generated by the system.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A power plant heating unit optimization control method is characterized by comprising the following steps:
A. determining rated power, a main steam temperature interval, a main steam pressure interval, an exhaust temperature interval and a heat supply flow interval of a steam turbine;
B. respectively adopting a single variable mode to carry out experiments on the main steam temperature, the main steam pressure, the exhaust temperature and the heat supply flow to obtain real-time power curves of the steam turbine in different states;
C. establishing a PID regulator of the turbine power aiming at each turbine real-time power curve;
the PID regulator for establishing the turbine power comprises the following steps,
c1, selecting a plurality of detection points on a real-time power curve of the steam turbine;
segmenting a real-time power curve of the steam turbine, wherein each segment of the power curve keeps monotonicity, at least two detection points are selected from each segment of the power curve, and the power deviation of the two detection points closest to each other on the adjacent segments of the power curve is less than 5% of rated power;
c2, selecting initial parameters of the PID regulator according to the detection point data;
c3, setting the initial parameters of the PID regulator to obtain optimal parameters;
firstly, giving a plurality of selectable values of the proportional link coefficient, inputting detection point data into a PID regulator, traversing all the selectable values of the proportional link coefficient, and selecting the selectable value of the proportional link coefficient corresponding to the highest linearity output by the PID regulator as the optimal value of the proportional link coefficient;
then, giving a minimum value of a differential link coefficient, inputting a disturbance signal to a PID regulator, and gradually increasing the differential link coefficient until the output oscillation period of the PID regulator is smaller than a set threshold value, wherein the differential link coefficient at the moment is used as an optimal value of the differential link coefficient;
finally, selecting an optimal value of the coefficient of an integral link by taking the highest linearity of the output of the PID regulator and the real-time power curve of the steam turbine as a target;
D. c, controlling the temperature of the main steam, the pressure of the main steam, the exhaust temperature and the heat supply flow according to the PID regulator established in the step C;
the control of the main steam temperature, the main steam pressure, the exhaust temperature and the heat supply flow rate comprises the following steps,
according to the target power of the steam turbine, selecting target main steam pressure and target heat supply flow, then changing the opening degree of each speed regulation valve, and stabilizing the main steam temperature and the exhaust temperature in a high-efficiency interval while stabilizing the actual power of the steam turbine at the target power;
the method for suppressing oscillation generated by a system in the process of controlling the temperature of main steam, the pressure of main steam, the temperature of exhaust and the flow rate of heat supply comprises the following steps,
d1, selecting an oscillation monitoring frequency interval and monitoring a valve body object;
d2, establishing an oscillation monitoring frequency interval and a correlation function for monitoring a valve body object;
d3, judging whether oscillation occurs according to the frequency monitoring result, and if oscillation occurs, adjusting the valve position by using the associated valve body to inhibit oscillation.
2. A plant heating unit optimization control method according to claim 1, characterized in that: in step B, when a single variable experiment is performed, the variation of the single variable includes linear variation and nonlinear variation.
3. A plant heating unit optimization control method according to claim 1, characterized in that: and step B, clustering the real-time power curve of the steam turbine according to the test result, and fitting the curve in each class to obtain the fitted real-time power curve of the steam turbine.
4. The power plant heating unit optimization control method according to claim 1, characterized in that: and after the optimal parameters are obtained, fine adjustment is carried out on the most parameters by using a trial and error method.
5. A plant heating unit optimization control method according to claim 1, characterized in that: and setting a valve position adjusting and limiting interval of the monitoring valve body.
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| CN102692875A (en) * | 2012-06-07 | 2012-09-26 | 王卫良 | Method for realizing main steam pressure tracking optimization of steam turbine |
| CN111352400A (en) * | 2020-03-13 | 2020-06-30 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Heat supply unit sliding pressure operation optimization method and sliding pressure operation control system |
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| EP0974880B1 (en) * | 1998-07-20 | 2003-09-24 | Siemens Building Technologies AG | Autoadaptive PID controller |
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| CN102692875A (en) * | 2012-06-07 | 2012-09-26 | 王卫良 | Method for realizing main steam pressure tracking optimization of steam turbine |
| CN111352400A (en) * | 2020-03-13 | 2020-06-30 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Heat supply unit sliding pressure operation optimization method and sliding pressure operation control system |
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