CN219676488U - Water level three-impulse control device of deaerator with water dynamic feedforward - Google Patents
Water level three-impulse control device of deaerator with water dynamic feedforward Download PDFInfo
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Abstract
The utility model discloses a deaerator water level three-impulse control device with a water supply dynamic feedforward function, which comprises a logic AND gate, a water supply flow differential inertia feedforward loop, a first PID regulator, a second PID regulator and a manual operator; the unit load and the water supply flow are respectively used as the input of a water supply flow differential inertia feedforward loop, and the output end of the water supply flow differential inertia feedforward loop is connected with the feedforward value input end of the first PID regulator. The differential inertia feedforward loop of the water supply flow is added on the basis of the original deaerator water level three-impulse control system, the differential inertia value of the water supply flow is used as a feedforward value to be input into the feedforward value input end of the first PID regulator, when the water supply flow changes, due to the differential advancing effect, the condensate flow can respond quickly in advance when the water supply flow is disturbed, the deaerator water level is prevented from greatly fluctuating when the water supply flow is disturbed, and the deaerator water level is stably regulated.
Description
Technical Field
The utility model relates to the technical field of thermal power generation, in particular to a deaerator water level three-impulse control device with a feed-water dynamic feedforward function.
Background
At present, the three impulse control system structures of deaerator water level that are used commonly are: the condensate flow is used as an intermediate variable, the cascade PID is used for controlling the water level, and the water flow value is added at the output of the main PID to be used as feed forward. It can be seen that the feed-forward of the feed-water flow adopts a real-time measurement value of the feed-water flow, when the process of the feed-water flow and the water level of the deaerator is much smaller than the inertia and the delay of the process of the condensate flow and the water level of the deaerator, the water level of the deaerator is easy to severely fluctuate when the feed-water flow is disturbed, and the integral safe and stable operation of the unit is seriously affected.
For example, in the related art, the chinese patent publication No. CN113405088A describes a method for automatically adjusting the three impulses of the deaerator water level of the condensate system under the condition of low load or deep peak regulation of the thermal power generator set, three impulses of the deaerator water level, the water supply flow and the condensate flow are introduced into a cascade adjusting controller, the water level deviation is corrected by the controller, the water level is guaranteed to have no static deviation, and the output signal of the main regulator and the feedforward signal of the water supply flow generate the set value of the main condensate flow through the action of the main regulator; there is a problem in that the deaerator water level is liable to fluctuate drastically when the feed water flow is disturbed.
Disclosure of Invention
The utility model aims to solve the technical problem of stably regulating the water level of the deaerator.
The utility model solves the technical problems by the following technical means:
the utility model provides a deaerator water level three-impulse control device containing water supply dynamic feedforward, which comprises: the system comprises a logic AND gate, a feedwater flow differential inertia feedforward loop, a first PID regulator, a second PID regulator and a manual operator;
the three impulse conditions and the self/manual output value of the manual operator are used as the input of the logic AND gate, and the output end of the logic AND gate is respectively connected with the input end of the tracking switch of the second PID regulator and the input end of the feed water flow differential inertia feedforward loop; the frequency conversion value output end of the second PID regulator is connected with the input end of the manual operation device, the frequency conversion value output end of the manual operation device is connected with the tracking value input end of the second PID regulator, and the self/manual output end of the second PID regulator is connected with the tracking switch input end of the first PID regulator;
the condensate flow is respectively used as the input of the tracking value input end of the first PID regulator and the input of the regulated quantity measurement input end of the second PID regulator; the deaerator water level is respectively used as the input of the regulated quantity measuring input end of the first PID regulator and the input of the feedwater flow differential inertia feedforward loop;
the deaerator water level set value is used as the input of the regulated quantity set value input end of the first PID regulator, and the variable frequency value output end of the first PID regulator is connected with the regulated quantity set value input end of the second PID regulator;
the unit load and the water supply flow are respectively used as the input of the water supply flow differential inertia feedforward loop, and the output end of the water supply flow differential inertia feedforward loop is connected with the feedforward value input end of the first PID regulator.
The control device is added with a differential inertia feedforward loop of the water supply flow on the basis of the original deaerator water level three-impulse control system, the differential inertia value of the water supply flow is used as a feedforward value to be input into the feedforward value input end of the first PID regulator, when the water supply flow changes, due to the differential advancing effect, the condensate flow can respond quickly in advance when the water supply flow is disturbed, the deaerator water level is prevented from greatly fluctuating when the water supply flow is disturbed, the deaerator water level is stably regulated, and the safety and stability of the unit operation are improved.
Further, the feedwater flow differential inertia feedforward loop comprises a broken line function module, an inertia time module and an addition module;
the output end of the logic AND gate is connected with the input end of the tracking switch of the inertia time module;
the deaerator water level is respectively used as the input of the input end of the inertial value to be inertial of the inertial time module and the input of the adding module;
the unit load is used as the input of the broken line function module, the water supply flow is used as the input of the inertia time module, the output of the broken line function module is connected with the inertia time module and the first PID regulator, and the output of the inertia module is connected with the feedforward value input end of the first PID regulator through the addition module.
Further, the polyline function module comprises a first polyline function device, a second polyline function device, a third polyline function device and a fourth polyline function device;
the unit load is respectively used as the input of the first folding line function device, the second folding line function device, the third folding line function device and the fourth folding line function device; the output end of the first folding line function device is connected with the proportional coefficient input end of the first PID regulator, the output end of the second folding line function device is connected with the integral time input end of the first PID regulator, and the output end of the third folding line function device and the output end of the fourth folding line function device are respectively connected with the inertia time module.
Further, the inertia time module comprises a first inertia time calculator, a second inertia time calculator and a third inertia time calculator;
the output end of the logic AND gate is respectively connected with the tracking switch input end of the first inertia time calculator, the tracking switch input end of the second inertia time calculator and the tracking switch input end of the third inertia time calculator;
the deaerator water level is used as the input of the to-be-inertial value input end of the first inertial time calculator, and the output end of the third folding line function device is connected with the time constant input end of the second inertial time calculator;
the water supply flow is respectively used as the input of the to-be-inertial value input end of the third inertial time calculator and the input of the fourth folding line function device; the output end of the fourth folding line function device is connected with the time constant input end of the second inertia time calculator;
the output ends of the first inertia time calculator, the second inertia time calculator and the third inertia time calculator are connected with the addition module.
Further, the addition module comprises a first adder, a second adder and a third adder;
the deaerator water level is used as the input of the first input end of the first adder, and the output end of the first inertia time calculator is connected with the second input end of the first adder;
the water supply flow is taken as the input of the first input end of the second adder, and the output end of the second inertia time calculator is connected with the second input end of the second adder;
the output end of the first adder and the output end of the second adder are respectively connected with the first input end and the second input end of the third adder, and the output end of the third inertia time calculator is connected with the third input end of the third adder;
the output end of the third adder is connected with the feedforward value input end of the first PID regulator.
Further, the coefficients of the first input and the second input of the first adder are 1 and-1, respectively.
Further, the coefficients of the first input and the second input of the second adder are 1 and-1, respectively.
Further, the coefficients of the first input terminal, the second input terminal, and the third input terminal of the third adder are all 1.
Further, y of the fourth fold line functionally is incremented with x.
The utility model has the advantages that:
(1) The control device is added with a differential inertia feedforward loop of the water supply flow on the basis of the original deaerator water level three-impulse control system, the differential inertia value of the water supply flow is used as a feedforward value to be input into the feedforward value input end of the first PID regulator, when the water supply flow changes, due to the differential advancing effect, the condensate flow can respond quickly in advance when the water supply flow is disturbed, the deaerator water level is prevented from greatly fluctuating when the water supply flow is disturbed, the deaerator water level is stably regulated, and the safety and stability of the unit operation are improved.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
FIG. 1 is a schematic diagram of a three-impulse control device for deaerator water level with dynamic feed-forward feed according to an embodiment of the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions in the embodiments of the present utility model will be clearly and completely described in the following in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1, an embodiment of the present utility model provides a deaerator water level three-impulse control device with feed-water dynamic feedforward, the device includes: logic AND gate 10, feedwater flow differential inertial feed forward loop, first PID regulator 50, second PID regulator 60, and manual operator 70;
the three impulse conditions and the self/manual output value of the manual controller 70 are used as the input of the logic AND gate 10, and the output end of the logic AND gate 10 is respectively connected with the tracking switch input end TR of the second PID regulator 60 and the input end of the feedwater flow differential inertia feedforward loop; the variable frequency output end OUT of the second PID regulator 60 is connected with the input end IN of the manual controller 70, the variable frequency output end A/M of the manual controller 70 is connected with the tracking value input end TV of the second PID regulator 60, and the self/manual output end A/M of the second PID regulator 60 is connected with the tracking switch input end TR of the first PID regulator 50;
the condensate flow is respectively used as the input of the tracking value input end TV of the first PID regulator 50 and the input of the regulated quantity measuring value input end PV of the second PID regulator 60; the deaerator water level is respectively used as the input of the regulated measurement input end PV of the first PID regulator 50 and the input of the feedwater flow differential inertia feedforward loop;
the deaerator water level set point is used as the input of the regulated quantity set point input end SP of the first PID regulator 50, and the variable frequency value output end OUT of the first PID regulator 50 is connected with the regulated quantity set point input end SP of the second PID regulator 60;
the unit load and the water supply flow are respectively used as the input of the water supply flow differential inertia feedforward loop, and the output of the water supply flow differential inertia feedforward loop is connected with the feedforward value input end of the first PID regulator 50.
The analog quantity in the present control device includes: condensate flow (after three-separation), deaerator water level set point, unit load and water supply flow (after three-separation); the switching value is three impulse conditions; the analog output is a condensing pump frequency conversion instruction.
The control device is added with a differential inertia feedforward loop of the water supply flow on the basis of the original deaerator water level three-impulse control system, the differential inertia value of the water supply flow is used as a feedforward value to be input into the feedforward value input end of the first PID regulator, when the water supply flow changes, due to the differential advancing effect, the condensate flow can respond quickly in advance when the water supply flow is disturbed, the deaerator water level is prevented from greatly fluctuating when the water supply flow is disturbed, the deaerator water level is stably regulated, and the safety and stability of the unit operation are improved.
The control device outputs the tracking analog condensate flow (after three selections) by the calculated value of the first PID regulator 50, the tracking condensate pump variable-frequency command by the calculated value of the second PID regulator 60 and the differential inertia feedforward loop of all the water supply flow in a tracking mode when the three impulse conditions are not met or the water level of the deaerator is manual, so that the manual/automatic undisturbed switching of the control system is realized.
The control device provided by the embodiment adds a differential inertia value of the water supply flow rate as a feedforward value of the first PID regulator on the basis of the original deaerator water level three-impulse control system, the first PID regulator calculates a condensate flow rate set value through the deaerator water level, a deaerator water level set value and the differential inertia value of the water supply flow rate, and the self-adaption of the parameters of the first PID regulator under different working conditions is realized through unit load and corresponding loops; when the water supply flow changes, due to the early action of differentiation, the condensate flow can respond quickly, and the great fluctuation of the water level of the deaerator during the disturbance of the water supply flow is avoided, so that the control quality of the water level of the deaerator is improved, and the safety and the stability of the operation of the unit are improved.
In one embodiment, the feedwater flow differential inertial feed forward loop includes a polyline function module 20, an inertial time module 30, and an summing module 40;
the output end of the logic AND gate 10 is connected with the input end of the tracking switch of the inertia time module 30;
the deaerator water level is used as the input of the input end of the inertia value to be inertial of the inertial time module 30 and the input of the adding module 40 respectively;
the unit load is used as the input of the broken line function module 20, the water supply flow is used as the input of the inertia time module 30, the output of the broken line function module 20 is connected with the inertia time module 30 and the first PID regulator 50, and the output of the inertia time module 30 is connected with the feedforward value input end of the first PID regulator 50 through the addition module 40.
In one embodiment, the polyline function module 20 includes a first polyline function unit 21, a second polyline function unit 22, a third polyline function unit 23, and a fourth polyline function unit 24;
the unit load is respectively used as the input of the first fold line function device 21, the second fold line function device, the third fold line function device 23 and the fourth fold line function device 24; the output end of the first folding line function device 21 is connected with the proportionality coefficient input end KP of the first PID regulator 50, the output end of the second folding line function device 22 is connected with the integration time input end TI of the first PID regulator 50, and the output end of the third folding line function device 23 and the output end of the fourth folding line function device 24 are respectively connected with the inertia time module 30.
It should be noted that, the polyline function in this embodiment is used for calculating according to the input x to obtain the output y, where x and y are in a linear relationship, and specifically, see HOLLIAS MACS manual; for any one input, the polyline function (HSCHARC) obtains an output by utilizing linear interpolation according to preset polyline data points, and the output is used for calculating a set value in a PID automatic regulating loop so as to realize that corresponding parameters are matched with the current working condition under different load working conditions.
In one embodiment, the inertia time module 30 includes a first inertia time calculator 31, a second inertia time calculator 32, and a third inertia time calculator 33;
the output terminal of the logic and gate 10 is connected to the tracking switch input terminal TR of the first inertia time calculator 31, the tracking switch input terminal TR of the second inertia time calculator 32, and the tracking switch input terminal TR of the third inertia time calculator 33, respectively;
the deaerator water level is used as the input of the input end IN of the value to be inertial of the first inertial time calculator 31, and the output end OUT of the third folding line function 23 is connected with the time constant input end TLAG of the second inertial time calculator 32;
the feed water flow is respectively used as the input of the input end IN of the to-be-inertial value of the third inertial time calculator 33 and the input of the input end IN of the fourth folding line function device; the output terminal OUT of the fourth folding line function 24 is connected to the time constant input terminal TLAG of the second inertia time calculator 32;
the output ends of the first inertia time calculator 31, the second inertia time calculator 32 and the third inertia time calculator 33 are all connected with the adding module 40.
It should be noted that, in this embodiment, the differential inertia value of the feedwater flow is calculated through the feedwater flow (after three choices) and the corresponding loop, and when the change rate of the feedwater flow increases (or decreases), the differential inertia value increases (decreases), and the condensate flow increases (decreases) accordingly, so as to achieve the effect of quick response; the adaptation of the dynamic differential value under different working conditions is realized through the unit load and the corresponding loop, and generally, the larger the unit load is, the larger the dynamic differential is, so that the output y of the fourth folding line function device 24 is increased along with the input x.
It should be noted that, the inertial time calculator (HSFOP) in this embodiment is used for filtering or simulating a field object according to an input signal, and specifically, see the HOLLIAS MACS manual, for use with a regulator to filter and hysteresis the signal.
In one embodiment, the adding module 40 includes a first adder 41, a second adder 42, and a third adder 43;
the deaerator water level is taken as an input of a first input end of the first adder 41, and an output end of the first inertia time calculator 31 is connected with a second input end of the first adder 41;
the feed water flow is taken as an input IN1 of a first input end of the second adder 42, and an output end PUT of the second inertia time calculator 32 is connected with a second input end IN2 of the second adder 42;
the output terminal OUT of the first adder 41 and the output terminal OUT of the second adder 42 are respectively connected with the first input terminal IN1 and the second input terminal IN2 of the third adder 43, and the output terminal OUT of the third inertia time calculator 33 is connected with the third input terminal IN3 of the third adder 43;
the output OUT of the third adder 43 is connected to the feed forward value input FF of the first PID regulator 50.
The third adder 43 is configured to calculate a comprehensive feedforward value according to the output value of the first adder 41, the output value of the second adder 42, and the output value of the third inertia time calculator 33, output the feedforward value to the first PID regulator 50, calculate a condensate flow set value by integrating the deaerator water level (after three selections), the deaerator water level set value, and the feedforward value by the first PID regulator 50, and implement self-adaptation of the main PID parameters under different working conditions by using the unit load and the corresponding loop.
In one embodiment, the coefficients of the first input and the second input of the first adder 41 are 1 and-1, respectively.
In one embodiment, the coefficients of the first and second inputs of the second adder 42 are 1 and-1, respectively.
It should be noted that adder arrangements 1 and-1 are used to implement the subtraction function, respectively.
In one embodiment, the coefficients of the first input, the second input, and the third input of the third adder 43 are all 1.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.
Claims (9)
1. A deaerator water level three-impulse control device with feed-water dynamic feedforward, characterized in that the device comprises: the system comprises a logic AND gate, a feedwater flow differential inertia feedforward loop, a first PID regulator, a second PID regulator and a manual operator;
the three impulse conditions and the self/manual output value of the manual operator are used as the input of the logic AND gate, and the output end of the logic AND gate is respectively connected with the input end of the tracking switch of the second PID regulator and the input end of the feed water flow differential inertia feedforward loop; the frequency conversion value output end of the second PID regulator is connected with the input end of the manual operation device, the frequency conversion value output end of the manual operation device is connected with the tracking value input end of the second PID regulator, and the self/manual output end of the second PID regulator is connected with the tracking switch input end of the first PID regulator;
the condensate flow is respectively used as the input of the tracking value input end of the first PID regulator and the input of the regulated quantity measurement input end of the second PID regulator; the deaerator water level is respectively used as the input of the regulated quantity measuring input end of the first PID regulator and the input of the feedwater flow differential inertia feedforward loop;
the deaerator water level set value is used as the input of the regulated quantity set value input end of the first PID regulator, and the variable frequency value output end of the first PID regulator is connected with the regulated quantity set value input end of the second PID regulator;
the unit load and the water supply flow are respectively used as the input of the water supply flow differential inertia feedforward loop, and the output end of the water supply flow differential inertia feedforward loop is connected with the feedforward value input end of the first PID regulator.
2. The deaerator water level three-impulse control device with the feed-water dynamic feedforward function as claimed in claim 1, wherein the feed-water flow differential inertia feedforward loop includes a broken line function module, an inertia time module and an addition module;
the output end of the logic AND gate is connected with the input end of the tracking switch of the inertia time module;
the deaerator water level is respectively used as the input of the input end of the inertial value to be inertial of the inertial time module and the input of the adding module;
the unit load is used as the input of the broken line function module, the water supply flow is used as the input of the inertia time module, the output of the broken line function module is connected with the inertia time module and the first PID regulator, and the output of the inertia time module is connected with the feedforward value input end of the first PID regulator through the addition module.
3. The deaerator water level three impulse control device with dynamic feed-forward of water of claim 2, wherein the polyline function module comprises a first polyline function device, a second polyline function device, a third polyline function device and a fourth polyline function device;
the unit load is respectively used as the input of the first folding line function device, the second folding line function device, the third folding line function device and the fourth folding line function device; the output end of the first folding line function device is connected with the proportional coefficient input end of the first PID regulator, the output end of the second folding line function device is connected with the integral time input end of the first PID regulator, and the output end of the third folding line function device and the output end of the fourth folding line function device are respectively connected with the inertia time module.
4. The deaerator water level three-impulse control device with dynamic feed-forward of water of claim 3, wherein the inertia time module comprises a first inertia time calculator, a second inertia time calculator, and a third inertia time calculator;
the output end of the logic AND gate is respectively connected with the tracking switch input end of the first inertia time calculator, the tracking switch input end of the second inertia time calculator and the tracking switch input end of the third inertia time calculator;
the deaerator water level is used as the input of the to-be-inertial value input end of the first inertial time calculator, and the output end of the third folding line function device is connected with the time constant input end of the second inertial time calculator;
the water supply flow is respectively used as the input of the to-be-inertial value input end of the third inertial time calculator and the input of the fourth folding line function device; the output end of the fourth folding line function device is connected with the time constant input end of the second inertia time calculator;
the output ends of the first inertia time calculator, the second inertia time calculator and the third inertia time calculator are connected with the addition module.
5. The deaerator water level three-impulse control apparatus with dynamic feed-forward of water of claim 4, wherein said summing module comprises a first summer, a second summer, and a third summer;
the deaerator water level is used as the input of the first input end of the first adder, and the output end of the first inertia time calculator is connected with the second input end of the first adder;
the water supply flow is taken as the input of the first input end of the second adder, and the output end of the second inertia time calculator is connected with the second input end of the second adder;
the output end of the first adder and the output end of the second adder are respectively connected with the first input end and the second input end of the third adder, and the output end of the third inertia time calculator is connected with the third input end of the third adder;
the output end of the third adder is connected with the feedforward value input end of the first PID regulator.
6. The deaerator water level three-impulse control device with dynamic feed-forward of water of claim 5, wherein the first and second inputs of the first adder have coefficients of 1 and-1, respectively.
7. The deaerator water level three-impulse control device with dynamic feed-forward of water of claim 5, wherein the coefficients of the first input and the second input of the second adder are 1 and-1, respectively.
8. The deaerator water level three-impulse control device with dynamic feed-forward of water of claim 5, wherein coefficients of the first input, the second input, and the third input of the third adder are all 1.
9. The deaerator water level three impulse control device with dynamic feed forward of water as claimed in claim 3, wherein y of said fourth fold line functionally increases with x.
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| CN202222571235.9U CN219676488U (en) | 2022-09-27 | 2022-09-27 | Water level three-impulse control device of deaerator with water dynamic feedforward |
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| CN202222571235.9U CN219676488U (en) | 2022-09-27 | 2022-09-27 | Water level three-impulse control device of deaerator with water dynamic feedforward |
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