CN115387863A - BEST small steam turbine steam admission governing valve control system based on automatic undisturbed switching of multiplex condition - Google Patents
BEST small steam turbine steam admission governing valve control system based on automatic undisturbed switching of multiplex condition Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/105—Final actuators by passing part of the fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/14—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for responsive to other specific conditions
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Abstract
The application relates to a BEST small steam turbine admission governing valve control system based on automatic undisturbed switching of multiplex condition. The specific scheme is as follows: the method comprises the steps of inputting a switching value signal of a converter fault, inputting a switching value signal of a converter emergency stop, inputting a switching value signal of a converter master control state, inputting an analog quantity signal of a BEST small turbine rotating speed set value, inputting an analog quantity signal of a BEST small turbine actual rotating speed value, inputting an analog quantity signal of an actual load of the BEST small turbine, controlling a converter fault or emergency stop working condition admission throttle valve and controlling a BEST small turbine load shedding working condition admission throttle valve according to different working conditions. This application can carry out the adaptation to the converter at trouble or scram operating mode and the little steam turbine of BEST in load shedding operating mode, has improved the flexibility ratio and the accuracy to the admission governing valve aperture control of the little steam turbine of BEST.
Description
Technical Field
The application relates to the technical field of control over ultra-supercritical secondary reheating coal-fired units, in particular to a BEST small steam turbine steam inlet governing valve control system based on multi-working-condition automatic undisturbed switching.
Background
In the related technology, the BEST small turbine of the ultra-supercritical double-reheat coal-fired unit is provided with a small generator, and the BEST small turbine has unique structural attributes and various operation starting modes, so a large number of tests are required during debugging and research, the operation parameters and the operation states reflected by the BEST small turbine under various working conditions are summarized, and the BEST small turbine is improved and optimized by combining a control strategy formulated by an original manufacturer. When the converter is in a fault or an emergency stop working condition and the BEST small turbine is in a load shedding working condition, the original control strategy of the steam inlet regulating valve of the BEST small turbine cannot be fully applied to the two working conditions, so that the problems of inaccurate control operation target and inaccurate control operation parameters under each working condition are caused.
Disclosure of Invention
Therefore, the steam inlet governing valve control system of the BEST small steam turbine based on multi-working-condition automatic undisturbed switching is provided. The technical scheme of the application is as follows:
according to a first aspect of the embodiments of the present application, there is provided a BEST steam turbine admission control system based on multi-operating-condition automatic undisturbed switching, the system comprising a converter fault switching value signal input module, a converter sudden-stop switching value signal input module, a converter master control state switching value signal input module, a BEST steam turbine speed setting value analog quantity signal input module, a BEST steam turbine actual speed value analog quantity signal input module, a BEST steam turbine actual load analog quantity signal input module, a converter fault or sudden-stop operating condition admission control unit, a BEST small steam turbine load shedding operating condition admission control unit, the converter fault or sudden-stop operating condition admission control unit comprising a converter fault or sudden-stop operating condition determining sub-unit, a first subtraction sub-unit and a first subtraction sub-unit, the BEST small steam turbine load shedding operating condition admission control unit comprising a BEST small steam turbine load shedding operating condition determining sub-unit, a second subtraction sub-unit and a second tuning sub-unit, wherein,
the converter fault switching value signal input module, the converter sudden stop switching value signal input module and the converter master control state switching value signal input module are respectively connected with the converter fault or sudden stop working condition determining subunit, the BEST small turbine actual rotating speed value analog quantity signal input module is connected with the first subtraction subunit, and the converter fault or sudden stop working condition determining subunit, the BEST small turbine rotating speed set value analog quantity signal input module and the first subtraction subunit are respectively connected with the first gate control subunit;
the analog quantity signal input module of the actual load of the BEST small turbine, the analog quantity signal input module of the actual rotating speed value of the BEST small turbine, the switching quantity signal input module of the fault of the converter, the switching quantity signal input module of the sudden stop of the converter and the switching quantity signal input module of the master control state of the converter are respectively connected with the determining subunit of the load shedding working condition of the BEST small turbine, the analog quantity signal input module of the rotating speed set value of the BEST small turbine and the analog quantity signal input module of the actual rotating speed value of the BEST small turbine are respectively connected with the second subtracting subunit, and the determining subunit of the load shedding working condition of the BEST small turbine and the second subtracting subunit are respectively connected with the second throttle control subunit.
According to one embodiment of the application, the converter fault or scram condition determination subunit comprises a first or module, a first non-module and a first and module, wherein,
the converter fault switching value signal input module and the converter emergency stop switching value signal input module are respectively connected with the input end of the first OR module;
the switching value signal input module in the master control state of the converter is connected with the input end of the first non-module;
the output end of the first OR module and the output end of the first non-module are respectively connected with the input end of the first AND module;
and the output end of the first AND module is connected with the first gate adjusting control subunit.
According to an embodiment of the application, the first subtraction subunit comprises a first subtraction module, wherein,
an analog quantity signal input module of the actual rotating speed value of the BEST small turbine is connected with the input end of the first subtraction module, and the output end of the first subtraction module is connected with the first gate regulating control subunit;
and the analog quantity signal input module of the actual rotating speed value of the BEST small turbine is connected with the first regulating control subunit.
According to one embodiment of the present application, the first throttle control subunit includes an alternative switching module, a second subtraction module, a first PID module, a first function f (x) converter module, and an analog quantity signal output module of the steam inlet throttle opening of the first small BEST turbine, wherein,
the output end of the first and module is connected with the EN end of the alternative switching module, the analog quantity signal input module of the rotating speed set value of the BEST small steam turbine is connected with the N end of the alternative switching module, and the output end of the first subtraction module is respectively connected with the Y end of the alternative switching module;
the output end of the alternative switching module is connected with the first input end of the second subtraction module, and the analog quantity signal input module of the actual rotating speed value of the BEST small steam turbine is connected with the second input end of the second subtraction module;
the output end of the second subtraction module is sequentially connected with the first PID module, the first function f (x) converter module and the analog quantity signal output module of the opening degree of the steam inlet regulating valve of the first BEST small steam turbine.
According to one embodiment of the application, the BEST small steam turbine load shedding condition determining subunit comprises a second OR module, a second NOT module, a second AND module, a pulse module, a hysteresis module and a comparison greater module, and a third AND module,
the switching value signal input module of the converter fault and the switching value signal input module of the converter emergency stop are respectively connected with the input end of the second OR module;
the switching value signal input module in the master control state of the converter is connected with the input end of the second non-module;
the output end of the second OR module and the output end of the second non-module are respectively connected with the input end of the first AND module, and the output end of the first AND module is connected with the input end of the pulse module;
the analog quantity signal input module of the actual load of the BEST small steam turbine is sequentially connected with the input ends of the lag module and the comparison larger module; the comparison greater module is used for determining a comparison result obtained by comparing the load value output by the hysteresis module with a first preset load value;
the output end of the pulse module and the output end of the comparison module are respectively connected with the input end of the third and module;
and the output end of the third AND module is connected with the second gate adjusting control subunit.
According to an embodiment of the application, the first preset load value is 5MW.
According to an embodiment of the application, the second subtraction sub-unit comprises a third subtraction module, wherein,
the analog quantity signal input module of the actual rotating speed value of the BEST small turbine and the analog quantity signal input module of the rotating speed set value of the BEST small turbine are respectively connected with the input end of the third subtraction module;
and the output end of the third subtraction module is connected with the second gate adjusting control subunit.
According to an embodiment of the present application, the second throttle control subunit includes a switching value output module in which the fast-closing solenoid valve is charged and the steam intake throttle command is cleared, a second PID module, a second function f (x) converter module, and an analog quantity signal output module of the steam intake throttle opening of the second BEST small steam turbine, wherein,
the output end of the third AND module is connected with a switching value output module which is electrified and the steam inlet governing valve is cleared;
the output end of the third AND module and the output end of the third subtraction module are respectively connected with the input end of the second PID module;
and the output end of the second PID module is sequentially connected with the second function f (x) converter module and an analog quantity signal output module of the opening degree of a steam inlet regulating valve of the second BEST small steam turbine.
The technical scheme provided by the embodiment of the application at least has the following beneficial effects:
and the steam inlet regulating valve control unit controls the steam inlet regulating valve opening of the BEST small turbine according to different working conditions through the converter fault or the sudden stop working condition and the steam inlet regulating valve control unit under the load shedding working condition of the BEST small turbine. Therefore, the system can adapt the converter to the fault or sudden stop working condition and the BEST small turbine to the load shedding working condition, and the flexibility and the accuracy of the control of the opening degree of the steam inlet regulating valve of the BEST small turbine are improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application and are not to be construed as limiting the application.
FIG. 1 is a block diagram of a steam inlet governing valve control system of a BEST small steam turbine based on multi-operating-condition automatic undisturbed switching in an embodiment of the present application;
FIG. 2 is a schematic view of a control flow of the admission governor of the BEST small turbine when the converter is in a fault or sudden stop condition;
FIG. 3 is a schematic view of the inlet steam governor control process of the BEST small turbine under the load shedding condition.
Detailed Description
In order to make the technical solutions of the present application better understood by those of ordinary skill in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. The implementations described in the following exemplary examples do not represent all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
It should be noted that, in the related art, the small turbine of the ultra-supercritical double reheat coal-fired unit BEST has a small generator, and because the small turbine has unique structural attributes and various operation starting modes, a large number of tests need to be performed during debugging and research, the operation parameters and the operation states reflected by the small turbine of BEST under various working conditions are summarized, and the small turbine is improved and optimized by combining a control strategy formulated by an original manufacturer. When a converter is in a fault or an emergency stop working condition and a BEST small turbine is in a load shedding working condition, the original control strategy of the inlet throttle of the BEST small turbine cannot be fully applied to the two working conditions, so that the problems of inaccurate control operation target and inaccurate control operation parameters under each working condition are caused.
Based on the problems, the steam inlet governing valve control system of the BEST small steam turbine based on multi-working-condition automatic undisturbed switching can control the opening of the steam inlet governing valve of the BEST small steam turbine according to different working conditions through a converter fault or an emergency stop working condition steam inlet governing valve control unit and a BEST small steam turbine load shedding working condition steam inlet governing valve control unit. Therefore, the system can adapt the converter to the fault or sudden stop working condition and the BEST small turbine to the load shedding working condition, and the flexibility and the accuracy of the control of the opening degree of the steam inlet regulating valve of the BEST small turbine are improved.
Fig. 1 is a block diagram of a steam inlet throttle control system of a small BEST turbine based on multi-operating-condition automatic undisturbed switching in an embodiment of the present application.
As shown in fig. 1, the system for controlling the admission throttle of the small BEST turbine based on the multi-operating-condition automatic undisturbed switching comprises: the control system comprises a converter fault switching value signal input module 102, a converter sudden stop switching value signal input module 103, a converter master control state switching value signal input module 104, a BEST small turbine rotating speed set value analog quantity signal input module 105, a BEST small turbine actual rotating speed value analog quantity signal input module 106, a BEST small turbine actual load analog quantity signal input module 101, a converter fault or sudden stop condition admission regulating valve control unit 107 and a BEST small turbine load shedding condition admission regulating valve control unit 108, wherein the converter fault or sudden stop condition admission regulating valve control unit 107 comprises a converter fault or sudden stop condition determining sub-unit 1071, a first subtraction sub-unit 1072 and a first regulation sub-unit 1073, and the BEST small turbine load shedding condition admission regulating valve control unit 108 comprises a BEST small turbine load shedding condition determining sub-unit 1081, a second subtraction sub-unit 1082 and a second regulation sub-unit 3.
The converter fault switching value signal input module 102, the converter sudden stop switching value signal input module 103 and the converter master control switching value signal input module 104 are respectively connected with the converter fault or sudden stop working condition determining subunit 1071, the BEST small turbine actual rotating speed value analog value signal input module 106 is connected with the first subtraction subunit 1072, the converter fault or sudden stop working condition determining subunit 1071 and the BEST small turbine rotating speed set value analog value signal input module 105 and the first subtraction subunit 1072 are respectively connected with the first throttle control subunit 1073.
In some embodiments of the present application, as shown in fig. 2, the converter fault or sudden stop condition determination subunit includes a first or module 207, a first non-module 208, and a first and module 209, where the converter fault switching value signal input module 201 and the converter sudden stop switching value signal input module 202 are respectively connected to an input end of the first or module 207; the switching value signal input module of the converter master control state is connected with the input end of the first non-module 208; the output end of the first or module 207 and the output end of the first non-module 208 are respectively connected with the input end of a first and module 209; the output of the first and module 209 is connected to the first gating control subunit.
As a possible example, when the converter is not in fault, the output signal of the converter fault switching value signal input module 201 is 1; when the converter does not have the sudden stop working condition, the output signal of the converter sudden stop switching value signal input module 202 is 1. If the switching value signals output by the switching value signal input module 201 of the converter fault and the switching value signal input module 202 of the converter sudden stop are both 1, the output signal of the first or module 207 is 1. When the converter is in the master control state, the output signal of the switching value signal input module in the master control state of the converter is 1, and the output signal of the first non-module 208 is 0. When the switching value signals output by the first or module 207 and the first non-module 208 are both 1, the output signal of the first and module 209 is 1, which indicates that the current working condition is the normal operating condition, and the output end of the one-out-of-two switching module 211 is the "N" end of the one-out-of-two switching module 211.
As another possible example, when the converter fails, the output signal of the converter-failed switching value signal input module 201 is 0; when the converter has an emergency stop working condition, the output signal of the converter emergency stop switching value signal input module 202 is 0. If the switching value signal output by any one of the converter fault switching value signal input module 201 and the converter sudden stop switching value signal input module 202 is 0, the output signal of the first or module 207 is 0. When the converter is not in the master control state, the output signal of the switching value signal input module in the master control state of the converter is 0, and the output signal of the first non-module 208 is 1. When the switching value signal output by any one of the first or module 207 and the first non-module 208 is 0, the output signal of the first and module 209 is 0, which indicates that the current working condition is a converter fault or an emergency stop working condition, and the output end of the alternative switching module 211 is the "Y" end of the alternative switching module 211.
In some embodiments of the present application, as shown in fig. 2, the first subtraction subunit includes a first subtraction module 210, wherein the analog quantity signal input module 205 of the actual speed value of the small turbine BEST is connected to an input end of the first subtraction module 210, and an output end of the first subtraction module 210 is connected to the first gate control subunit; the analog quantity signal input module 205 of the actual rotating speed value of the BEST small turbine is connected with the first governing control subunit.
In some embodiments of the present application, the first gate control subunit includes an alternative switching module 211, a second subtraction module 212, a first PID module 213, a first function f (x) converter module 214, and an analog quantity signal output module 206 of the steam inlet gate opening of the first small turbine, wherein an output terminal of the first and module 209 is connected to an EN terminal of the alternative switching module 211, an analog quantity signal input module 204 of the rotation speed setting value of the small turbine is connected to an N terminal of the alternative switching module 211, and output terminals of the first subtraction module 210 are respectively connected to a Y terminal of the alternative switching module 211; the output end of the alternative switching module 211 is connected with the first input end of the second subtraction module 212, and the analog quantity signal input module 205 of the actual rotating speed value of the BEST small turbine is connected with the second input end of the second subtraction module 212; the output end of the second subtraction module 212 is connected to the first PID module 213, the first function f (x) converter module 214, and the analog quantity signal output module 206 of the inlet throttle opening of the first small BEST turbine in sequence.
It should be noted that the one-out-of-two switching module 211 functions such that when the EN terminal receives the switching value signal "0" output by the first and module 209, the output terminal thereof is the N terminal of the one-out-of-two switching module 211, and when the EN terminal receives the switching value signal "1" output by the first and module 209, the output terminal thereof is the Y terminal of the one-out-of-two switching module 211.
In a normal operation condition, the switching value signal output by the first and module 209 is "0", the EN end of the alternative switching module 211 cannot be triggered, the switching value signal is kept to be "0", the alternative switching module 211 uses the N end as an input end, and the output result is the rotating speed set value of the small BEST turbine input by the analog quantity signal input module 204 of the rotating speed set value of the small BEST turbine; the second subtraction module 212 receives the actual rotation speed value of the small BEST turbine input by the analog quantity signal input module 205 of the set rotation speed value of the small BEST turbine and the actual rotation speed value of the small BEST turbine, subtracts the set rotation speed value of the small BEST turbine and the actual rotation speed value of the small BEST turbine to obtain a deviation value, and outputs the deviation value to the first PID module 213. The first PID module 213 performs PID adjustment on the deviation value, calculates the opening degree value of the steam inlet damper of the small BEST turbine by the first function f (x) converter module 214, and inputs the opening degree value of the steam inlet damper of the small BEST turbine to the analog quantity signal output module 206 of the opening degree of the steam inlet damper of the first small BEST turbine.
As a possible example, the function of the first PID module 213 is that, when there is a deviation in the process itself, the output of the first PID module 213 will change constantly, the output changing the deviation in the decreasing direction; the function of the first function F (x) converter module 214 is that F (x) is a function set containing twelve fold lines, and the first function F (x) converter module 214 performs interpolation operation using the function set according to the range of the input end to obtain an output value.
When the converter is in fault or in an emergency stop working condition, the switching value signal output by the first and module 209 is "1", the EN end of the alternative switching module 211 is triggered to keep the switching value signal as "1", the alternative switching module 211 uses the "Y" end as an input end, and the output result is a first difference value obtained by subtracting the actual rotating speed value of the small turbine BEST output by the analog quantity signal input module 205 of the actual rotating speed value of the small turbine BEST from the preset value X in the first subtraction module 210; the first difference value and the actual rotating speed value of the BEST small turbine are input into a second subtraction module 212, the second subtraction module 212 subtracts the first difference value and the actual rotating speed value of the BEST small turbine to obtain an offset value, a first PID module 213 is used for carrying out PID adjustment on the offset value, an opening degree value of an inlet throttle of the BEST small turbine is obtained through calculation of a first function f (x) converter module 214, and the opening degree value of the inlet throttle of the BEST small turbine is input into an analog quantity signal output module 206 of the opening degree of the inlet throttle of the first BEST small turbine.
It can be understood that when the converter fails, the rotating speed of the BEST small turbine is rapidly reduced, and the opening degree of a steam inlet throttle of the BEST small turbine is reduced. And subtracting the preset value X from the actual rotating speed value of the BEST small turbine for difference, wherein the obtained result value is inevitably smaller than the actual rotating speed value of the BEST small turbine, and the opening of the steam inlet regulating valve of the BEST small turbine is adjusted through the result value, so that the rotating speed can be controlled in a reasonable range in advance, and the phenomenon that the descending speed of the opening of the steam inlet regulating valve of the BEST small turbine is too high is avoided.
As shown in fig. 1, an analog quantity signal input module 101 of the actual load of the BEST small turbine, an analog quantity signal input module 106 of the actual rotational speed value of the BEST small turbine, a switching quantity signal input module 102 of the converter failure, a switching quantity signal input module 103 of the converter emergency stop, and a switching quantity signal input module 104 of the converter master control state are respectively connected with the determination subunit 1081 of the load shedding condition of the BEST small turbine, an analog quantity signal input module 105 of the rotational speed setting value of the BEST small turbine, and an analog quantity signal input module 106 of the actual rotational speed value of the BEST small turbine are respectively connected with the second subtraction subunit 1082, and the determination subunit 1081 of the load shedding condition of the BEST small turbine and the second subtraction subunit 1082 are respectively connected with the second throttle control subunit 1083.
The load shedding means that the power generation amount of the steam turbine generator in the power plant exceeds the amount delivered to the user because the electric load of the end user is reduced (for example, a large-scale electric equipment fault or a large-area line fault power outage), and at this time, the power plant is required to reduce the power generation amount to a value suitable for the actual load. Or the internal reason of the power plant, the network outlet breaker is suddenly tripped, the load of the steam turbine generator is suddenly reduced to be basically zero, and the execution actions of the power plant are called load shedding.
In some embodiments of the present application, as shown in fig. 3, the weight small turbine load shedding condition determining subunit includes a second or module 309, a second non-module 310, a second and module 311, a pulse module 318, a hysteresis module 313, and a comparison greater module 314 and a third and module 312, wherein the switching value signal input module 302 of the converter failure and the switching value signal input module 303 of the converter sudden stop are respectively connected to the input terminals of the second or module 309; the switching value signal input module 304 of the converter master control state is connected with the input end of the second non-module 310; the output end of the second or module 309 and the output end of the second non-module 310 are respectively connected with the input end of the first and module, and the output end of the first and module is connected with the input end of the pulse module 318; the analog quantity signal input module 306 of the actual load of the BEST small turbine is sequentially connected with the input ends of the hysteresis module 313 and the comparison greater module 314; the comparison greater module 314 is configured to determine a comparison result obtained by comparing the load value output by the hysteresis module 313 with a first preset load value; the output end of the pulse module 318 and the output end of the comparison greater module 314 are respectively connected with the input end of the third and module 312; the output of the third and module 312 is connected to the second gating control subunit.
As a possible example, when the converter is not in fault, the output signal of the converter fault switching value signal input module 302 is 1; when the converter does not have the sudden stop working condition, the output signal of the converter sudden stop switching value signal input module 303 is 1. If the switching value signals output by the converter fault switching value signal input module 302 and the converter scram switching value signal input module 303 are both 1, the output signal of the second or module 309 is 1. When the converter is in the master control state, the output signal of the switching value signal input module 304 in the master control state of the converter is 1, and the output signal of the second non-module 310 is 0. When the switching value signals output by the second or module 309 and the second not module 310 are both 1, the output signal of the second and module 311 is 1.
As another possible example, when the converter fails, the output signal of the converter-failed switching value signal input module 302 is 0; when the converter has an emergency stop working condition, the output signal of the converter emergency stop switching value signal input module 303 is 0. If the switching value signal output by any one of the converter fault switching value signal input module 302 and the converter sudden stop switching value signal input module 303 is 0, the output signal of the second or module 309 is 0. When the converter is not in the master control state, the output signal of the switching value signal input module 304 in the master control state of the converter is 0, and the output signal of the second non-module 310 is 1. When the switching value signal output by any one of the second or module 309 and the second non-module 310 is 0, the output signal of the second and module 311 is 0.
It should be noted that, since there is a delay in the output signals of the converter failure switching value signal input module 302, the converter sudden-stop switching value signal input module 303, and the converter master control switching value signal input module 304, it is necessary to delay the output signal of the analog value signal input module 306 of the actual load of the turbine in BEST by the delay module 313, so as to ensure the consistency among the modules.
In some embodiments of the present application, the first predetermined load value is 5MW.
In some embodiments of the present application, as shown in fig. 3, the second subtraction subunit includes a third subtraction module 315, wherein the analog quantity signal input module of the actual rotating speed value of the small turbine BEST, and the analog quantity signal input module 305 of the rotating speed set value of the small turbine BEST are respectively connected to the input terminals of the third subtraction module 315; the output of the third subtraction module 315 is connected to the second gating control subunit.
In some embodiments of the present application, the second throttle control subunit includes a switching value output module 307 in which the fast-closing solenoid valve is charged and the steam inlet throttle command is cleared, a second PID module 316, a second function f (x) converter module 317, and an analog quantity signal output module 308 of the steam inlet throttle opening of the second small BEST turbine, wherein an output end of the third and module 312 is connected to the switching value output module 307 in which the fast-closing solenoid valve is charged and the steam inlet throttle command is cleared; the output of the third and module 312 and the output of the third subtraction module 315 are connected to the input of a second PID module 316, respectively; the output end of the second PID module 316 is connected in turn to a second function f (x) converter module 317 and an analog quantity signal output module 308 of the opening degree of the admission governor of the second BEST small turbine.
Before the BEST small turbine is subjected to load shedding and in the normal working condition after the BEST small turbine is subjected to load shedding, the actual rotating speed value of the BEST small turbine output by an analog quantity signal input module 306 of the actual rotating speed value of the BEST small turbine and the rotating speed set value of the BEST small turbine output by an analog quantity signal input module 305 of the rotating speed set value of the BEST small turbine are subtracted by a third subtraction module 315 to obtain a deviation value, the third subtraction module 315 outputs the deviation value to a second PID module 316, the second PID module 316 carries out PID adjustment on the deviation value, an inlet throttle opening value of the BEST small turbine is obtained through calculation of a second function f (x) converter module 317, and the inlet throttle opening value of the BEST small turbine is input to an analog quantity signal output module 308 of the inlet throttle opening of the second BEST small turbine.
When the current working condition is a BEST small turbine load shedding working condition, firstly, the analog quantity signal input module 306 of the actual load of the BEST small turbine outputs the actual load value of the BEST small turbine to the first larger and larger module 314 through the first hysteresis module 313, and when the actual load value of the BEST small turbine is larger than the preset load value, the BEST small turbine is described and has the condition capable of carrying out load shedding operation. At this time, the load shedding operation is triggered, so that the switching value signal input module 302 causing the converter fault or the switching value signal input module 303 causing the converter sudden stop is triggered, and the switching value signal input module 304 in the converter master control state sends out a switching value signal of 0. The third and module 312 outputs the switching value signal 1 to the switching value output module 307 which is charged by the fast-closing solenoid valve and cleared by the steam inlet governing valve instruction, so as to trigger the switching value output module 307 which is charged by the fast-closing solenoid valve and cleared by the steam inlet governing valve instruction to control the fast-closing solenoid valve to carry out 1s fast closing and clear by the steam inlet governing valve instruction. The third and module 312 outputs the switching value signal 1 to the second PID module 316, so as to trigger the tracking switch TS of the second PID module 316, so that the tracking value TR is "0", and the gate performs 1s fast closing action; after the steam inlet governing valve of the small BEST turbine performs 1s of quick closing action, the deviation value is continuously subjected to PID adjustment through the second PID module 316, the opening degree value of the steam inlet governing valve of the small BEST turbine is obtained through calculation of the second function f (x) converter module 317, and the opening degree value of the steam inlet governing valve of the small BEST turbine is input to the analog quantity signal output module 308 of the opening degree of the steam inlet governing valve of the second small BEST turbine.
It should be noted that the second PID module 316 has a function that when there is a deviation in the process itself, the output of the second PID module 316 will change continuously, and the output changes the deviation in the direction of decreasing, and when the terminal Ts of the tracking switch is triggered, the tracking value Tr set inside itself will be output, and then the deviation value is continuously adjusted by the second PID module 316; the second function F (x) converter module 317 has the functions that F (x) is a function set containing twelve fold lines, and the second function F (x) converter module 317 performs interpolation operation by using the function set according to the range of the input end to obtain the steam inlet damper opening degree output value of the small steam turbine BEST.
According to the BEST small turbine steam inlet governing valve control system based on the multi-working-condition automatic undisturbed switching, the steam inlet governing valve control unit of the BEST small turbine is controlled by the converter fault or the scram working condition and the steam inlet governing valve control unit of the BEST small turbine load shedding working condition according to different working conditions. Therefore, the system can adapt the converter under the working condition of failure or sudden stop and the small BEST turbine under the working condition of load shedding, and the flexibility and the accuracy of the control of the opening degree of the steam inlet regulating valve of the small BEST turbine are improved.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific 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 disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. A BEST small steam turbine admission governing valve control system based on multi-operating mode automatic undisturbed switching is characterized by comprising a switching value signal input module of converter faults, a switching value signal input module of converter sudden stop, a switching value signal input module of a converter master control state, an analog quantity signal input module of a BEST small steam turbine rotating speed set value, an analog quantity signal input module of a BEST small steam turbine actual rotating speed value, an analog quantity signal input module of actual loads of a BEST small steam turbine, a converter fault or sudden stop operating mode admission governing valve control unit and a BEST small steam turbine load shedding operating mode admission governing valve control unit, wherein the converter fault or sudden stop operating mode admission governing valve control unit comprises a converter fault or sudden stop determining stator unit, a first subtraction subunit and a first governing valve control subunit, the BEST small steam turbine load shedding operating mode admission governing valve control unit comprises a BEST small steam turbine load shedding operating mode determining stator unit, a second subtraction subunit and a second governing valve control subunit, wherein the converter fault or sudden stop operating mode admission control subunit is controlled by the first subtraction sub-unit,
the converter fault switching value signal input module, the converter sudden stop switching value signal input module and the converter master control state switching value signal input module are respectively connected with the converter fault or sudden stop working condition determining subunit, the BEST small turbine actual rotating speed value analog quantity signal input module is connected with the first subtraction subunit, and the converter fault or sudden stop working condition determining subunit, the BEST small turbine rotating speed set value analog quantity signal input module and the first subtraction subunit are respectively connected with the first gate control subunit;
the analog quantity signal input module of the actual load of the BEST small turbine, the analog quantity signal input module of the actual rotating speed value of the BEST small turbine, the switching quantity signal input module of the fault of the converter, the switching quantity signal input module of the sudden stop of the converter and the switching quantity signal input module of the main control state of the converter are respectively connected with the load shedding working condition determining subunit of the BEST small turbine, the analog quantity signal input module of the rotating speed set value of the BEST small turbine and the analog quantity signal input module of the actual rotating speed value of the BEST small turbine are respectively connected with the second subtracting subunit, and the load shedding working condition determining subunit of the BEST small turbine and the second subtracting subunit are respectively connected with the second throttle control subunit.
2. The system of claim 1, wherein the converter fault or scram condition determination subunit comprises a first OR module, a first NOT module, and a first AND module, wherein,
the converter fault switching value signal input module and the converter emergency stop switching value signal input module are respectively connected with the input end of the first OR module;
the switching value signal input module in the master control state of the converter is connected with the input end of the first non-module;
the output end of the first OR module and the output end of the first NOT module are respectively connected with the input end of the first AND module;
and the output end of the first AND module is connected with the first gate adjusting control subunit.
3. The system of claim 2, wherein the first subtraction sub-unit comprises a first subtraction module, wherein,
an analog quantity signal input module of the actual rotating speed value of the BEST small turbine is connected with the input end of the first subtraction module, and the output end of the first subtraction module is connected with the first gate regulating control subunit;
and the analog quantity signal input module of the actual rotating speed value of the BEST small turbine is connected with the first gate control subunit.
4. The system of claim 3, wherein the first throttle control subunit includes an alternative switching module, a second subtraction module, a first PID module, a first function f (x) converter module, and an analog signal output module of the inlet throttle opening of the first BEST small turbine, wherein,
the output end of the first and module is connected with the EN end of the alternative switching module, the analog quantity signal input module of the rotation speed set value of the BEST small steam turbine is connected with the N end of the alternative switching module, and the output end of the first subtraction module is respectively connected with the Y end of the alternative switching module;
the output end of the alternative switching module is connected with the first input end of the second subtraction module, and the analog quantity signal input module of the actual rotating speed value of the BEST small steam turbine is connected with the second input end of the second subtraction module;
the output end of the second subtraction module is sequentially connected with the first PID module, the first function f (x) converter module and the analog quantity signal output module of the opening degree of the steam inlet regulating valve of the first BEST small steam turbine.
5. The system of claim 1, wherein the BEST small turbine load shedding condition determining subunit comprises a second OR module, a second NOT module, a second AND module, a pulse module, a lag module, and a compare greater module, a third AND module, wherein,
the switching value signal input module of the converter fault and the switching value signal input module of the converter sudden stop are respectively connected with the input end of the second OR module;
the switching value signal input module in the master control state of the converter is connected with the input end of the second non-module;
the output end of the second OR module and the output end of the second NOT module are respectively connected with the input end of the first AND module, and the output end of the first AND module is connected with the input end of the pulse module;
the analog quantity signal input module of the actual load of the BEST small turbine is sequentially connected with the hysteresis module and the input end of the comparison larger module; the comparison greater module is used for determining a comparison result obtained by comparing the load value output by the hysteresis module with a first preset load value;
the output end of the pulse module and the output end of the comparison treatment module are respectively connected with the input end of the third and module;
and the output end of the third AND module is connected with the second gate adjusting control subunit.
6. The system according to claim 5, characterized in that said first preset load value is 5MW.
7. The system of claim 5, wherein the second subtraction sub-unit comprises a third subtraction module, wherein,
the analog quantity signal input module of the actual rotating speed value of the BEST small turbine and the analog quantity signal input module of the rotating speed set value of the BEST small turbine are respectively connected with the input end of the third subtraction module;
and the output end of the third subtraction module is connected with the second gate adjusting control subunit.
8. The system according to claim 7, wherein the second throttle control subunit includes a switching value output module in which the fast-closing solenoid valve is charged and the steam intake throttle command is cleared, a second PID module, a second function f (x) converter module, and an analog quantity signal output module of the steam intake throttle opening of the second BEST small steam turbine, wherein,
the output end of the third AND module is connected with a switching value output module which is electrified and the steam inlet governing valve is cleared;
the output end of the third sum module and the output end of the third subtraction module are respectively connected with the input end of the second PID module;
and the output end of the second PID module is sequentially connected with the second function f (x) converter module and an analog quantity signal output module of the opening degree of a steam inlet regulating valve of the second BEST small steam turbine.
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