CN210919166U - Steam turbine speed governing optimization system under FCB operating mode - Google Patents
Steam turbine speed governing optimization system under FCB operating mode Download PDFInfo
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- CN210919166U CN210919166U CN201921699817.7U CN201921699817U CN210919166U CN 210919166 U CN210919166 U CN 210919166U CN 201921699817 U CN201921699817 U CN 201921699817U CN 210919166 U CN210919166 U CN 210919166U
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Abstract
The utility model discloses a steam turbine speed regulation optimizing system under FCB working condition, the system includes offset computation module, offset switching value judging module and PID speed regulator connected with offset computation module and offset switching value judging module; the offset calculation module comprises a first analog input module, a first division block, a second analog input module, a differential block, a second division block, a third division block, a subtraction block, a low comparison block, a switching block and an analog output end; the bias switching value judging module comprises a switching value input module, a first pulse block, a second pulse block, an RS trigger, a non-block and a switching value output module.
Description
Technical Field
The utility model relates to a steam turbine technical field, concretely relates to steam turbine speed governing optimization system under FCB operating mode.
Background
With the promotion of series policies such as national energy conservation and emission reduction, energy structure optimization and adjustment and the like, new requirements are put forward on a power plant control system under the new situation that the proportion of new energy is increased and the structures of power grids such as western and east power transmission, power grid interconnection and the like are increasingly complex, and the function normalization of the FCB tends to be great.
The inventor finds that the DEH rotating speed control scheme under the current FCB working condition has the following defects in the research and development process:
(1) after the FCB occurs, the load of the steam turbine is changed rapidly, the steam turbine is switched from a load control mode to a rotating speed control mode, and the rotating speed control mode adopts a PID control mode. Since the load change precedes the rotation speed change, the PID control method based on the amount of modulation as the rotation speed has a large lag, resulting in frequent oscillations of the control system.
(2) The original control scheme estimates the island load by using a frequency difference signal and a rotation speed unequal rate, and the estimated value is greatly different from the actual value due to the nonlinear relation between the frequency difference and the island load.
Disclosure of Invention
In order to overcome the not enough of above-mentioned prior art, the utility model provides a steam turbine speed governing optimization system under FCB operating mode.
The utility model discloses the technical scheme who adopts does:
a steam turbine speed regulation optimizing system under an FCB working condition comprises a bias amount calculating module;
the offset calculation module comprises a first analog input module, a first division block, a second analog input module, a differential block, a second division block and a third division block;
one end of the first analog input module is connected with the analog output end of the DEH system, the other end of the first analog input module is connected with the input end of the first division block, the output end of the first division block is connected with the third division block, one end of the second analog input module is connected with the analog output end of the DEH system, the other end of the second analog input module is connected with the input end of the micro-block, and the output end of the micro-block is connected with the third division block through the second division block.
Further, the offset calculation module further comprises a subtraction block, a low comparison block, a switching block and an analog output end;
the output end of the third division block is connected with the switching block, the input end of the subtraction block is connected with the output end of the second analog quantity input module, the output end of the subtraction block is connected with the input end of the low comparison block, the output end of the low comparison block is connected with the switching block, the output end of the switching block is connected with the analog quantity output module, and the output end of the analog quantity output module is connected with the analog input end of the PID speed regulator.
The device further comprises an offset switching value judging module, wherein the offset switching value judging module comprises a switching value input module, a first pulse block, a second pulse block, an RS trigger and a switching value output module;
one end of the switching value input module is connected with the switching value output end of the DEH system, the other end of the switching value input module is connected with the setting end of the RS trigger, the input end of the first pulse block is connected with the output end of the low comparison block, the output end of the first pulse block is connected with the resetting end of the RS trigger, the output end of the RS trigger is connected with the input end of the second pulse block, and the output end of the second pulse block is connected with the tracking switch pin of the PID speed regulator through the switching value output module.
Further, a non-block is connected between the RS flip-flop and the second pulse block.
Through the technical scheme, the beneficial effects of the utility model are that:
(1) the utility model realizes the advanced control of the rotating speed of the steam turbine, effectively avoids the phenomena of serious rotating speed overshoot, severe and frequent network frequency fluctuation and the like;
(2) the utility model adopts the ratio of the rotor acceleration to the rotor flying acceleration to calculate the island load correction value, and can accurately calculate the island load after the FCB occurs;
(3) the utility model discloses a PID control adds the biased control mode, carries out FCB operating mode steam turbine rotational speed control, realizes OPC and trails in short time after reseing DEH rotational speed controller, makes DEH rotational speed controller output from zero direct step to offset, guarantees that steam turbine power and island load are balanced fast, realizes steam turbine rotational speed advanced control, avoids the downward overshoot of rotational speed, and the fast and stable island net is frequently.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the application and are not intended to limit the invention in any way.
FIG. 1 is a block diagram of a turbine speed regulation optimization system under FCB conditions;
the device comprises an analog quantity input module 1, a first analog quantity input module 2, a first division block 3, a second analog quantity input module 4, a differential block 5, a second division block 6, a third division block 7, a subtraction block 8, a low comparison block 9, a switching block 10, an analog quantity output end 11, a switching quantity input module 12, a first pulse block 13, an RS trigger 14, a non-block 15, a second pulse block 16, a switching quantity output module 17 and a PID speed regulator.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Fig. 1 is a structural diagram of a turbine speed regulation optimization system under the FCB working condition according to the present embodiment. As shown in fig. 1, the system for optimizing speed regulation of a steam turbine includes a bias amount calculating module and a bias switching amount judging module.
Specifically, the offset calculation module comprises a first analog input module 1, a first division block 2, a second analog input module 3, a differential block 4, a second division block 5, a third division block 6, a subtraction block 7, a low comparison block 8, a switching block 9 and an analog output end 10.
One end of the first analog quantity input module 1 is connected with the analog output end of the DEH system, the other end is connected with the input end of the first division block 2, the output end of the first division block 2 is connected with a third division block 6, one end of the second analog quantity input module 3 is connected with the analog output end of the DEH system, the other end of the second analog quantity input module is connected with the input end of a differential block 4, the output end of the differential block 4 is connected with a third division block 6 through a second division block 5, the output end of the third division block 6 is connected with a switching block 9, the input end of the subtraction block 7 is connected with the output end of the second analog quantity input module 3, the output end of the subtraction block 7 is connected with the input end of the low comparison block 8, the output end of the low comparison block 8 is connected with a switching block 9, the output end of the switching block 9 is connected with an analog quantity output module 10, the output end of the analog quantity output module 10 is connected with the analog input end of the PID speed regulator 17.
Main steam pressure P output by DEH systemTInputting a first division block 2 through a first analog quantity input module 1, wherein the first division block 2 divides the rated main steam pressure PTeWith the received main steam pressure PTAnd (4) dividing to obtain a main steam pressure correction coefficient K, and outputting to the third division block 6.
The actual rotating speed N output by the DEH system is input into the differential block 4 through the second analog quantity input module 3, the differential block 4 performs differential processing on the received actual rotating speed N to obtain rotor acceleration a, the differential block 4 outputs the rotor acceleration a to the second division block 5, the second division block 5 divides the rotor flying acceleration and the rotor acceleration a to obtain island load, and the island load is output to the third division block 6.
The third division block 6 divides the received main steam pressure correction coefficient K and the island load to obtain an island load correction value, and outputs the island load correction value to the switching block 9.
The actual rotating speed N output by the DEH system is input into a subtraction block 7 through a second analog quantity input module 3, and the subtraction block 7 combines the received actual rotating speed N with the set OPC reset rotating speed NOPCSubtracting, outputting the obtained difference value to a low comparison block 8, comparing the received difference value with-0.1 by the low comparison block 8, and if the difference value is less than-0.1, judging that the actual rotating speed N is the actual rotating speed<OPC reset rotation speed NOPCThe method comprises the steps of outputting a selection switch value 1 to a switching block 9, wherein the switching block 9 selects Y-path output, directly outputs an island load correction value at the moment to an analog quantity output module 10 as an offset, and the analog quantity output module 10 outputs the offset to a tracking quantity input pin TRIN of a PID (proportion integration differentiation) speed regulator 17; if the difference is not less than-0.1, the actual rotating speed N is judged to be not less than the OPC reset rotating speed NOPCAnd outputting the selection switch value 0 to a switching block 9, wherein the switching block 9 selects N paths as output, outputs an island load correction value, and does not act on the analog quantity output module 10.
In this embodiment, the time constant T of the micro-segment 41Set to 1 second, time constant T for filtering out high frequency interference signals2Set to 2 seconds. The rotor flying acceleration is a constant and can be measured by a load shedding test, for example, the rotor flying acceleration of a million units is 350 r/min/s. The rated main steam pressure is a constant and can be obtained by checking a specification of a steam turbine, for example, the rated main steam pressure of a million units is 28 MPa. OPC reset rotation speed NOPCIs constant, obtained by looking up the DEH configuration setting, typically set 3060.
Specifically, the offset switching value judging module comprises a switching value input module 11, a first pulse block 12, a second pulse block 15, an RS flip-flop 13, a non-block 14 and a switching value output module 16.
One end of the switching value input module 11 is connected with the switching value output end of the DEH system, the other end is connected with the position end S of the RS trigger 13, the input end of the first pulse block 12 is connected with the output end of the low comparison block 8, the output end of the first pulse block 12 is connected with the reset end R of the RS trigger 13, the output end of the RS trigger 13 is connected with the input end of the non-block 14, the output end of the non-block 14 is connected with the input end of the second pulse block 15, and the output end of the second pulse block 15 is connected with the T pin of the tracking switch of the PID speed regulator 17 through the switching value output module 16.
The FCB signal output by the DEH system is input to a setting end S of an RS trigger 13 through a switching value input module 11, and when the low comparison block 8 judges that the actual rotating speed N is<OPC reset rotation speed NOPCThe offset switching value output by the low comparison block 8 is input to a reset end R of the RS flip-flop 13 through the first pulse block 12, the RS flip-flop 13 outputs the offset switching value to the second pulse block 15 through the non-block 14, the second pulse block 15 outputs the offset switching value to the switching value output module 16, and the switching value output module 16 outputs the offset switching value to a tracking switch T pin of the PID speed regulator 17.
In the steam turbine speed regulation optimization system under the FCB working condition provided by this embodiment, a steam turbine rotation speed signal, an FCB signal, and a main steam pressure signal of a DEH system are introduced into the steam turbine speed regulation optimization system, an island load percentage is determined by calculating a ratio of a rotor acceleration to a rotor flying acceleration, and then a rotation speed control offset is calculated by main steam pressure correction; the offset is output and then is connected to a DEH rotating speed controller tracking input pin, so that the tracking offset of the DEH rotating speed controller within two seconds of OPC resetting is realized, and the rotating speed controller performs PID automatic control by taking the offset as an initial value after the OPC resetting is performed for two seconds, thereby solving the problems of serious rotating speed overshoot and frequent fluctuation under the FCB working condition.
As shown in fig. 1, the operating principle of the steam turbine speed regulation optimizing system under the FCB working condition proposed in this embodiment is as follows:
under the FCB working condition, the rotating speed of the steam turbine rapidly rises, OPC acts, and the PID speed regulator rapidly reaches zero. The OPC is reset along with the reduction of the rotating speed, the offset switching value sends out 2-second pulses, because a tracking switch pin of the PID speed regulator is connected with an offset switching value judging module of the system, the PID speed regulator is in a tracking state at the moment, the tracking value is the offset, the offset switching value is the 2-second pulses, the PID speed regulator is released to be in a normal regulation state after tracking for 2 seconds, and the PID speed regulator starts to control the rotating speed by taking the offset as an initial value at the moment.
Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.
Claims (4)
1. A steam turbine speed regulation optimization system under an FCB working condition is characterized by comprising a bias amount calculation module;
the offset calculation module comprises a first analog input module, a first division block, a second analog input module, a differential block, a second division block and a third division block;
one end of the first analog input module is connected with the analog output end of the DEH system, the other end of the first analog input module is connected with the input end of the first division block, the output end of the first division block is connected with the third division block, one end of the second analog input module is connected with the analog output end of the DEH system, the other end of the second analog input module is connected with the input end of the micro-block, and the output end of the micro-block is connected with the third division block through the second division block.
2. The system for optimizing speed regulation of a steam turbine under the FCB working condition according to claim 1, wherein the offset calculation module further comprises a subtraction block, a low comparison block, a switching block and an analog output end;
the output end of the third division block is connected with the switching block, the input end of the subtraction block is connected with the output end of the second analog quantity input module, the output end of the subtraction block is connected with the input end of the low comparison block, the output end of the low comparison block is connected with the switching block, the output end of the switching block is connected with the analog quantity output module, and the output end of the analog quantity output module is connected with the analog input end of the PID speed regulator.
3. The system for optimizing the speed regulation of the steam turbine under the FCB working condition according to claim 1, further comprising a bias switching value judging module, wherein the bias switching value judging module comprises a switching value input module, a first pulse block, a second pulse block, an RS trigger and a switching value output module;
one end of the switching value input module is connected with the switching value output end of the DEH system, the other end of the switching value input module is connected with the setting end of the RS trigger, the input end of the first pulse block is connected with the output end of the low comparison block, the output end of the first pulse block is connected with the resetting end of the RS trigger, the output end of the RS trigger is connected with the input end of the second pulse block, and the output end of the second pulse block is connected with the tracking switch pin of the PID speed regulator through the switching value output module.
4. The system for optimizing speed regulation of a steam turbine under an FCB condition of claim 3, wherein a non-block is connected between the RS trigger and the second pulse block.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114925463A (en) * | 2022-04-21 | 2022-08-19 | 西安热工研究院有限公司 | Reverse osmosis unit membrane life prediction system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114925463A (en) * | 2022-04-21 | 2022-08-19 | 西安热工研究院有限公司 | Reverse osmosis unit membrane life prediction system |
| CN114925463B (en) * | 2022-04-21 | 2024-02-27 | 西安热工研究院有限公司 | Membrane life prediction system of reverse osmosis device |
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