CN113050411A - Steam turbine main control auxiliary pressure regulating control system and method during deep peak regulation - Google Patents
Steam turbine main control auxiliary pressure regulating control system and method during deep peak regulation Download PDFInfo
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- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
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Abstract
A main steam pressure deviation correction loop is arranged in a main control load set value loop of a steam turbine, the pressure offset setting of the correction loop is gradually reduced along with the reduction of group loads, a load set value is corrected in a PI (proportional integral) adjustment mode according to the main steam pressure deviation, the corrected main steam pressure deviation is subjected to PI adjustment calculation to form a load setting correction amount, the load set value of the unit is corrected after the load setting correction amount is subjected to amplitude limiting and effectiveness selection, so that the main steam pressure deviation in the deep peak shaving process is reduced, the main steam pressure deviation is ensured to be in a required range in the load reduction process, the phenomenon that the main steam pressure is too high in the deep peak shaving stage is avoided, the phenomena of too low and fluctuation of fuel quantity, water supply flow and total air quantity are eliminated, and the safety and the stability of the unit in the deep peak shaving stage are improved.
Description
Technical Field
The invention relates to the technical field of deep peak regulation of supercritical (super) critical coal-fired generator sets, in particular to a steam turbine main control auxiliary pressure regulation control system and method during deep peak regulation.
Background
With the continuous expansion of the installed scale of renewable energy sources, the stable operation of a power grid is increasingly affected by the discontinuity of the power generation output of the new energy sources. The flexibility modification and control system optimization of the thermal power generating unit are carried out on the power supply side, the frequency modulation and peak regulation capacity of the thermal power generating unit is further improved, the renewable energy consumption capacity is enhanced, and the stable operation of a power grid is facilitated.
The main steam pressure control scheme of the supercritical (super) critical unit in the prior art is as follows: the method is characterized in that a boiler following-based coordinated control system is adopted, the steam inlet flow of a steam turbine is adjusted through the master control of the steam turbine to control the electric load of a unit, the main steam pressure is controlled by adjusting the fuel quantity of the boiler, the water supply flow and the total air quantity, and when the main steam pressure is over-large, the flow of the steam turbine is corrected through a pressure pull-back loop controlled by an open loop.
When the peak load of an ultra (supercritical) unit is deeply regulated, particularly in the load reduction process from below 40% of rated load to the lowest stable combustion load stage, parameters such as fuel quantity, water supply flow, total air volume and the like gradually approach the lowest limit value to cause the down regulation capacity to gradually reduce, the main steam pressure reduction rate gradually slows down under the influence of the parameters to cause the pressure deviation to increase and the load reduction rate to slow down, if the main control of a steam turbine simply responds to the load change demand, the steam turbine regulating valve continues to be closed to cause the main steam pressure deviation to further increase, on one hand, the problems of water cooling wall overtemperature, insufficient steam pump output and the like are easily caused when the main steam pressure is too high, on the other hand, the main steam pressure deviation increase can cause the boiler fuel quantity, the water supply flow and the total air volume to continue to be reduced even to.
The main steam pressure deviation can be reduced by adopting the pressure pull-back loop when the pressure is too high, but the two problems exist, on one hand, the open-loop control characteristic is easy to cause the fluctuation of the main steam pressure, and further causes the fluctuation of fuel quantity, feed water flow and total air volume, and brings adverse effect to the safe operation of a unit at a low-load stage; on the other hand, the single pressure pull-back loop cannot distinguish different requirements of different load section units on main steam pressure control deviation.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a steam turbine main control auxiliary pressure regulating control system and a method during deep peak regulation, wherein a main steam pressure deviation correction loop is arranged in a steam turbine main control load set value loop, the pressure offset setting of the correction loop is gradually reduced along with the reduction of the load of a set, and the load set value is corrected by adopting a PI (proportional integral) regulation mode according to the main steam pressure deviation, so that the main steam pressure deviation is ensured to be in a required range during low load, the phenomenon that the main steam pressure is overhigh in the deep peak regulation stage is avoided, and the phenomena of fuel quantity, feed water flow, total overlow air quantity and fluctuation are further eliminated, so that the safety and the stability of the operation of a unit.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a steam turbine main control auxiliary pressure regulating control system during deep peak regulation comprises a first adder 6, wherein the input of the first adder 6 is connected with the input 1 of a load set value AI and the output of a selector 15, the output of the first adder 6 is connected with the reduced end of a first subtracter 7, the reduced end of the first subtracter 7 is connected with the input 2 of a unit load AI, the output of the first subtracter 7 is connected with the input of a unit load PI regulator 8, and the output of the unit load PI regulator 8 is connected with the output 17 of a steam turbine main control instruction AO;
the load set value AI input 1 is connected with the input of a broken line function 9, the output of the broken line function 9 is connected with the input of a speed limiter 10, the output of the speed limiter 10 is connected with the first input of a second adder 11, and the second input of the second adder 11 is connected with the main steam pressure set value AI output 3;
the output of the second adder 11 is connected with the subtracting end of a second subtracter 12, the subtracted end of the second subtracter 12 is connected with the main steam pressure AI input 4, the output of the second subtracter 12 is connected with the input of a load correction PI regulator 13, and the output of the load correction PI regulator 13 is connected with the input of an amplitude limiter 14; the output of the amplitude limiter 14 is connected to the Y terminal of the selector 15, the N terminal of the selector 15 is connected to the output of the constant module 16, and the selection terminal S of the selector 15 is connected to the load reducing DI input 5.
The polyline function 9 is set forth in the following table, where X is the percent of rated load and Y is the main steam pressure bias.
| X | ％ | 100 | 50 | 40 | 30 | 20 |
| Y | MPa | 1 | 1 | 0.8 | 0.5 | 0.3 |
The control method based on the control system comprises the following steps: the specific control method comprises the following steps:
step (1), giving main steam pressure bias according to a load set value and correcting the main steam pressure set value;
step (2), PI regulation calculation is carried out on the corrected main steam pressure deviation to form a load set correction amount;
step (3), load setting correction quantity amplitude limiting and effectiveness selection;
and (4) correcting the set load value of the unit.
The step (1) is specifically as follows: the load set value generates main steam pressure bias c through a broken line function 9 so as to distinguish different requirements of different load sections on the pressure bias; carrying out rate limitation on the main steam pressure offset c to generate a main steam pressure offset d after speed limitation; and (4) after speed limiting, the main steam pressure offset d and the main steam pressure set value are superposed and calculated to form a corrected main steam pressure set value e.
The step (2) is specifically as follows: and carrying out subtraction calculation on the main steam pressure and the corrected main steam pressure set value e to form a corrected main steam pressure deviation f, and carrying out PI calculation on the corrected main steam pressure deviation f to form a load setting correction value g.
The step (3) is specifically as follows: and carrying out amplitude limitation on the load setting correction value g to form a load setting correction value h after amplitude limiting, wherein the final load setting correction value i is equal to the load setting correction value h after amplitude limiting when the load is reduced, the final load setting correction value i is equal to a constant 0 when the load is not reduced, the lower limit of the amplitude is limited to 0, and the upper limit of the amplitude is limited to 20 MW.
The step (4) is specifically as follows: the final load setting correction value i and the load setting value are superposed to form a corrected load setting value a; and subtracting the corrected load set value a and the unit load to form a load deviation b, and performing PI regulation to generate a steam turbine master control instruction j.
The invention has the beneficial effects that:
when the system and the method for the steam turbine main control auxiliary pressure regulation control during deep peak regulation work, the main steam pressure offset values required under different loads can be distinguished according to the set unit load set values and the main steam pressure set values can be corrected in the load reduction process of the unit, the load set values can be corrected according to the corrected main steam pressure deviation to adjust the steam turbine main control instructions, so that the main steam pressure deviation in the deep peak regulation process is reduced, the main steam pressure deviation in the load reduction process is ensured to be in a required range, the phenomenon that the main steam pressure is too high in the deep peak regulation stage is avoided, the phenomena that the fuel quantity, the water supply flow and the total air quantity are too low and fluctuated are eliminated, and the safety and the stability of the unit in the operation in the deep peak regulation stage are improved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure, a load set value AI input 1, a unit load AI input 2, a main steam pressure set value AI input 3, a main steam pressure AI input 4, a load reduction DI input 5, a first adder 6, a first subtracter 7, a unit load PI regulator 8, a broken line function 9, a rate limiter 10, a second adder 11, a second subtracter 12, a load correction PI regulator 13, an amplitude limiter 14, a selector 15, a constant module 16 and a turbine main control command AO output 17; a-corrected load set value; b-load deviation; c-main steam pressure bias; d-main steam pressure offset after speed limiting; e-the corrected main steam pressure set value; f, correcting the pressure deviation of the main steam; g-load setting correction value; h-load setting correction value after amplitude limiting; i-final load setting correction value; j-turbine master control command.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, a steam turbine master control auxiliary pressure regulating control system during deep peak shaving includes: the system comprises a load set value AI input 1, a unit load AI input 2, a main steam pressure set value AI input 3, a main steam pressure AI input 4, a load reduction DI input 5, a first adder 6, a first subtracter 7, a unit load PI regulator 8, a broken line function 9, a rate limiter 10, a second adder 11, a second subtracter 12, a load correction quantity PI regulator 13, an amplitude limiter 14, a selector 15, a constant module 16 and a turbine master control instruction AO output 17;
the input of the first adder 6 is connected with the output of a load set value AI input 1 and a selector 15, the deducted end of the first subtracter 7 is connected with the output of the first adder 6, the deducted end of the first subtracter 7 is connected with a unit load AI input 2, the input of the unit load PI regulator 8 is connected with the output of the first subtracter 7, and the output of the unit load PI regulator 8 is connected with a steam turbine main control instruction AO output 17;
the input of the broken line function 9 is connected with the input 1 of the load set value AI, the input of the speed limiter 10 is connected with the output of the broken line function 9, and the input of the second adder 11 is connected with the output of the speed limiter 10 and the input 3 of the main steam pressure set value AI;
the subtracted end of the second subtracter 12 is connected with the input 4 of the main steam pressure AI, the subtracted end of the second subtracter 12 is connected with the output of the second adder 11, the input of the load correction PI regulator 13 is connected with the output of the second subtracter 12, and the input of the amplitude limiter 14 is connected with the output of the load correction PI regulator 13;
and the Y end of the selector 15 is connected with the output of the amplitude limiter 14, the N end of the selector is connected with the output of the constant module 16, and the selection end S of the selector is connected with the load reduction DI input 5.
The constant module 16 is set to 0.
The polyline function 9 is set as follows, where X is the percentage of rated load and Y is the main steam pressure bias:
| X | ％ | 100 | 50 | 40 | 30 | 20 |
| Y | MPa | 1 | 1 | 0.8 | 0.5 | 0.3 |
the control method based on the control system comprises the following steps: the method comprises the following steps of giving main steam pressure offset according to a load set value, correcting the main steam pressure set value, carrying out PI (proportional integral) regulation calculation on the corrected main steam pressure deviation to form a load set correction amount, limiting and selecting the load set correction amount and selecting validity, and correcting a unit load set value, wherein the specific control method comprises the following steps:
and (1) giving main steam pressure offset according to the load set value and correcting the main steam pressure set value. The load set value generates main steam pressure bias c through a broken line function so as to distinguish different requirements of different load sections on the pressure bias; carrying out rate limitation on the main steam pressure offset c to generate a main steam pressure offset d after speed limitation; and (4) after speed limiting, the main steam pressure offset d and the main steam pressure set value are superposed and calculated to form a corrected main steam pressure set value e.
And (2) carrying out PI regulation calculation on the corrected main steam pressure deviation to form a load set correction amount. And carrying out subtraction calculation on the main steam pressure and the corrected main steam pressure set value e to form a corrected main steam pressure deviation f, and carrying out PI calculation on the corrected main steam pressure deviation f to form a load setting correction value g.
And (3) load setting correction quantity limiting and effectiveness selection. Carrying out amplitude limitation on the load setting correction value g to form a load setting correction value h after amplitude limiting, wherein the final load setting correction value i is equal to the load setting correction value h after amplitude limiting when the load is reduced, and the final load setting correction value i is equal to a constant 0 when the load is not reduced; the lower limit of the amplitude is limited to 0, and the upper limit is limited to 20 MW.
And (4) correcting the set load value of the unit. The final load setting correction value i and the load setting value are superposed to form a corrected load setting value a; and subtracting the corrected load set value a and the unit load to form a load deviation b, and performing PI regulation to generate a steam turbine master control instruction j.
Claims (8)
1. The steam turbine main control auxiliary pressure regulating control system during deep peak regulation is characterized by comprising a first adder (6), wherein the input of the first adder (6) is connected with a load set value AI input (1) and the output of a selector (15), the output of the first adder (6) is connected with a subtracted end of a first subtracter (7), the subtracted end of the first subtracter (7) is connected with a unit load AI input (2), the output of the first subtracter (7) is connected with the input of a unit load PI regulator (8), and the output of the unit load PI regulator (8) is connected with a steam turbine main control instruction AO output (17);
the load set value AI input (1) is connected with the input of a broken line function (9), the output of the broken line function (9) is connected with the input of a speed limiter (10), the output of the speed limiter (10) is connected with the first input of a second adder (11), and the second input of the second adder (11) is connected with the main steam pressure set value AI output (3);
the output of the second adder (11) is connected with the subtracting end of a second subtracter (12), the subtracted end of the second subtracter (12) is connected with the main steam pressure AI input (4), the output of the second subtracter (12) is connected with the input of a load correction PI regulator (13), and the output of the load correction PI regulator (13) is connected with the input of an amplitude limiter (14); the output of the amplitude limiter (14) is connected with the Y end of a selector (15), the N end of the selector (15) is connected with the output of a constant module (16), and the selection end S of the selector (15) is connected with a load reduction DI input (5).
2. The auxiliary main pressure regulating control system for the deep peaking turbine according to claim 1, wherein the polygonal line function (9) is set as the following table, wherein X is a percentage of rated load and Y is main steam pressure bias.
3. The deep peaking turbine main control auxiliary pressure regulating control system according to claim 1, wherein the constant module (16) is set to 0.
4. The control method of the steam turbine main control auxiliary pressure regulating control system during deep peak shaving according to claim 1 is characterized by comprising the following steps:
and (1) giving main steam pressure offset according to the load set value and correcting the main steam pressure set value.
Step (2), PI regulation calculation is carried out on the corrected main steam pressure deviation to form a load set correction amount;
step (3), load setting correction quantity amplitude limiting and effectiveness selection;
and (4) correcting the set load value of the unit.
5. The control method of the turbine main control auxiliary pressure regulating control system during deep peak shaving according to claim 4,
the step (1) is specifically as follows: the load set value generates main steam pressure bias c through a broken line function so as to distinguish different requirements of different load sections on the pressure bias; carrying out rate limitation on the main steam pressure offset c to generate a main steam pressure offset d after speed limitation; and (4) after speed limiting, the main steam pressure offset d and the main steam pressure set value are superposed and calculated to form a corrected main steam pressure set value e.
6. The control method of the turbine main control auxiliary pressure regulating control system during deep peak shaving according to claim 4,
the step (2) is specifically as follows: and carrying out subtraction calculation on the main steam pressure and the corrected main steam pressure set value e to form a corrected main steam pressure deviation f, and carrying out PI calculation on the corrected main steam pressure deviation f to form a load setting correction value g.
7. The control method of the turbine main control auxiliary pressure regulating control system during deep peak shaving according to claim 4,
the step (3) is specifically as follows: and carrying out amplitude limitation on the load setting correction value g to form a load setting correction value h after amplitude limiting, wherein the final load setting correction value i during load reduction is equal to the load setting correction value h after amplitude limiting, the final load setting correction value i during non-load reduction is equal to a constant 0, the lower limit of the amplitude limitation is 0, and the upper limit of the amplitude limitation is 20 MW.
8. The control method of the turbine main control auxiliary pressure regulating control system during deep peak shaving according to claim 4,
the step (4) is specifically as follows: the final load setting correction value i and the load setting value are superposed to form a corrected load setting value a; and subtracting the corrected load set value a and the unit load to form a load deviation b, and performing PI regulation to generate a steam turbine master control instruction j.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114017764A (en) * | 2021-11-19 | 2022-02-08 | 西安热工研究院有限公司 | Automatic switching system and method for guide vane and rotating speed control of pneumatic draught fan |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114017764A (en) * | 2021-11-19 | 2022-02-08 | 西安热工研究院有限公司 | Automatic switching system and method for guide vane and rotating speed control of pneumatic draught fan |
| CN114017764B (en) * | 2021-11-19 | 2023-05-23 | 西安热工研究院有限公司 | Automatic switching system and method for guide vane and rotating speed control of pneumatic induced draft fan |
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Application publication date: 20210629 |