CN113991703A - Primary frequency modulation time interval control system and method for coal-fired generator set - Google Patents
Primary frequency modulation time interval control system and method for coal-fired generator set Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/04—Control effected upon non-electric prime mover and dependent upon electric output value of the generator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/10—The dispersed energy generation being of fossil origin, e.g. diesel generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2101/00—Special adaptation of control arrangements for generators
- H02P2101/20—Special adaptation of control arrangements for generators for steam-driven turbines
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Abstract
The invention discloses a primary frequency modulation time interval control system and a primary frequency modulation time interval control method for a coal-fired generator set, wherein the primary frequency modulation time interval control system comprises an acquisition module and a processing module, wherein the acquisition module is used for setting the actual rotating speed of the working of a steam turbine as a second constant; a first constant is preset in the processing module, the first constant is compared with a second constant to obtain a rotation speed difference value, and a frequency difference power value is calculated through the rotation speed difference value; the control module carries out lag inertia processing on the frequency difference power value and outputs frequency difference power according to the positive value and the negative value of the power difference value; in the invention, during primary frequency modulation regression, a large value is selected and filtering processing is carried out, so that frequent shaking caused by invalid multi-action adjustment of the high-speed regulating valve is avoided, and the risks of breakage of a valve rod of the high-speed regulating valve of the steam turbine and leakage of an EH oil pipeline caused by primary frequency modulation are greatly reduced.
Description
Technical Field
The invention relates to the technical field of control of coal-fired generator sets, in particular to a system and a method for controlling a primary frequency modulation time interval of a coal-fired generator set.
Background
The primary frequency modulation refers to an automatic control process that once the frequency of the power grid deviates from a rated value, a control system of a unit in the power grid automatically controls the increase and decrease of the active power of the unit, limits the change of the power grid frequency and enables the power grid frequency to be stable. When the frequency of the power grid is increased, the primary frequency modulation function requires the unit to utilize the heat storage of the unit to quickly reduce the load, and otherwise, the unit quickly increases the load. The primary frequency modulation control circuit of the coal-fired generator set can be generally divided into CCS primary frequency modulation and DEH primary frequency modulation, and is realized by the combined action of the two frequency modulation circuits, wherein the DEH primary frequency modulation acts rapidly (open-loop control), and the CCS primary frequency modulation stabilizes load finally (closed-loop control). The action value of the primary frequency modulation at the DEH side directly controls a turbine governor valve and is used for changing the load of the unit so that the unit can quickly respond to the requirement of the primary frequency modulation; and the primary frequency modulation in the CCS is automatically input along with the input of the coordination control CCS, and the adjustment of the load set value MWD is equivalent to the adjustment of the load set value MWD after the primary frequency modulation action, and the same action direction as the DEH is ensured, so that the adjustment action of the DEH is prevented from being pulled back, and the load is finally stabilized to a required value.
The existing primary frequency modulation control scheme of the coal-fired generator set is very simple, the deviation between the rated rotating speed and the actual rotating speed of the steam turbine is calculated firstly, then the rotating speed deviation is sent to a frequency difference function to be calculated to obtain a frequency difference power signal, and the frequency difference power signal is superposed to a DEH comprehensive opening instruction and a CCS load instruction to realize the quick power adjustment and the quick response recovery of the power grid frequency. After the primary frequency modulation of a coal-fired unit is put into operation, the main problems exist: (1) the integral electric quantity is not enough after the primary frequency modulation action, namely the primary frequency modulation contribution rate is not enough; (2) under the sequence valve of the unit, the high-pressure regulating valves GV3 and GV4 shake frequently due to primary frequency modulation action, and valve rod breakage and valve body EH leakage accidents are easily caused.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
Therefore, the technical problems to be solved by the invention are as follows: aiming at the defects existing after the primary frequency modulation of the coal-fired unit is put into use, the novel primary frequency modulation time-sharing control method is adopted, the power grid frequency requirement can be quickly influenced, the integral contribution electric quantity of the primary frequency modulation can be ensured, the high-pressure regulating valve can be stably and smoothly regulated during the large-disturbance primary frequency modulation, and the high-frequency shaking of the high-pressure regulating valves GV3 and GV4 can be effectively prevented.
In order to solve the technical problems, the invention provides the following technical scheme: a coal-fired generating set primary frequency modulation timesharing control system, it includes: the system comprises an acquisition module and a processing module, wherein the acquisition module is used for setting the actual rotating speed of the working of the steam turbine as a second constant; a first constant is preset in the processing module, the first constant is compared with a second constant to obtain a rotation speed difference value, and a frequency difference power value is calculated through the rotation speed difference value; and the control module performs hysteresis inertia processing on the frequency difference power value and outputs the frequency difference power according to the positive and negative values of the power difference value.
As a preferred scheme of the one-time frequency modulation time interval control system of the coal-fired generator set, the invention comprises the following steps: and the control module outputs a frequency difference power unit to a turbine load instruction, adjusts the valve opening of the turbine and adjusts the actual power of the turbine.
As a preferred scheme of the one-time frequency modulation time interval control system of the coal-fired generator set, the invention comprises the following steps: the processing module comprises a processing chip and a subtracter, the acquisition module inputs a second constant into the subtracter, after a first constant preset in the processing chip is called, a frequency difference power conversion function F (x) is preset in the subtracter, and deviation calculation is carried out through the frequency difference power conversion function F (x) to obtain a frequency difference power value.
As a preferred scheme of the one-time frequency modulation time interval control system of the coal-fired generator set, the invention comprises the following steps: the control module comprises a controller and a time relay, the controller is used for comparing a first constant with a second constant, and a first time value and a second time value are preset in the time relay; when the second constant is larger than the first constant and the frequency difference power value is a negative value, the time relay selects a time value with a smaller value between the first time value and the second time value to output the frequency difference power; and when the second constant is smaller than the first constant and the frequency difference power value is a positive value, the time relay selects a time value with a larger value between the first time value and the second time value to output the frequency difference power.
As a preferred scheme of the one-time frequency modulation time interval control system of the coal-fired generator set, the invention comprises the following steps: and when the frequency difference power value is a positive value, the primary frequency modulation quantity of the valve of the regulating turbine is a positive value.
As a preferred scheme of the one-time frequency modulation time interval control system of the coal-fired generator set, the invention comprises the following steps: the system module further comprises a client and a remote sending unit, the remote sending unit is electrically connected with the controller in a two-way mode, the remote sending unit provides remote information transmission for the controller, and the client is connected with the remote sending unit.
A primary frequency modulation time-interval control method for a coal-fired power generating unit comprises the following steps: setting the rated rotating speed of the steam turbine to be a first constant; acquiring the actual rotating speed of the steam turbine, and setting the actual rotating speed as a second constant; comparing the first constant with the second constant, and subtracting the second constant from the first constant to obtain a rotation speed difference value; calculating to obtain a frequency difference power value through the rotating speed difference value, and performing hysteresis inertia processing on the frequency difference power value; and outputting the frequency difference power according to the positive and negative values of the power difference value.
As a preferred scheme of the one-time frequency modulation time interval control method of the coal-fired generator set, the method comprises the following steps: and inputting the output frequency difference power unit to a turbine load instruction, adjusting the valve opening of the turbine, and adjusting the actual power of the turbine.
As a preferred scheme of the one-time frequency modulation time interval control method of the coal-fired generator set, the method comprises the following steps: and inputting the second constant and the first constant into a subtracter, performing deviation calculation through the subtracter, and calculating the frequency difference power value through a frequency difference power conversion function F (x).
As a preferred scheme of the one-time frequency modulation time interval control method of the coal-fired generator set, the method comprises the following steps: performing lag inertial processing on the initial frequency difference power value, and presetting a first time value and a second time value of the lag inertial processing; comparing the first constant to the second constant; the second constant is larger than the first constant, the frequency difference power value is a negative value, the first time value and the second time value are compared, the time value with the smaller value is selected, the frequency difference power is output, and the primary frequency modulation quantity of the valve of the regulating turbine is a negative value; and the second constant is smaller than the first constant, the frequency difference power value is a positive value, the first time value and the second time value are compared, the time value with a larger value is selected, the frequency difference power is output, and the primary frequency modulation quantity of the valve of the regulating turbine is a positive value.
The invention has the beneficial effects that: the invention can be suitable for various working conditions of power grid frequency disturbance, meets the requirement of rapidity of primary frequency modulation action, and also well meets the requirement of primary frequency modulation amplitude (namely the requirement of frequency modulation integral quantity); during primary frequency modulation regression, a large value is selected and filtering processing is carried out, so that frequent shaking caused by invalid multi-action adjustment of the high-speed regulating valve is avoided, and the risks of valve rod fracture and EH oil pipeline leakage of the high-speed regulating valve of the steam turbine caused by primary frequency modulation are greatly reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
fig. 1 is a schematic diagram of primary frequency modulation in the first and second embodiments.
Fig. 2 is a graph showing the primary frequency modulation amount calculated for the frequency difference in the first and second embodiments. .
Fig. 3 is a flowchart of the hysteresis inertia process in the first and second embodiments.
Fig. 4 is a graph of frequency difference power in a second embodiment.
Fig. 5 is a control logic diagram of frequency modulated high and low 3s switching pulses in a third embodiment.
Fig. 6 is a flow chart of the control of the frequency modulation high and low 3s switching pulse in the third embodiment.
Fig. 7 is a schematic diagram of the connection of the processing module and the control module in the first embodiment.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
Referring to fig. 1 to 3 and 7, for a first embodiment of the present invention, the embodiment provides a primary frequency modulation time-interval control system for a coal-fired power generating unit, including an acquisition module 100 and a processing module, where the acquisition module 100 is used for acquiring an actual rotation speed of a steam turbine during operation, and setting the actual rotation speed as a second constant, and the actual rotation speed of the steam turbine during operation can be acquired by an existing steam turbine velometer; a first constant is preset in the processing module 200, 3000rpm is set as a second constant according to the rated rotating speed of the steam turbine of 3000rpm, the first constant is compared with the second constant to obtain a rotating speed difference value, and a frequency difference power value is obtained through calculation of the rotating speed difference value; the control module 300 performs hysteresis inertia processing on the frequency difference power value, and outputs the frequency difference power according to the positive and negative values of the power difference value. The control module 300 outputs the frequency difference power unit to a turbine load instruction, adjusts the valve opening of the turbine, and adjusts the actual power of the turbine.
In this embodiment, the processing module 200 includes a processing chip 201 and a subtractor 202, the processing chip 201 may adopt an existing ATMEL16/32 microprocessor chip, the acquisition module 100 inputs the second constant into the subtractor 202, and after the first constant preset in the processing chip 201 is retrieved, a frequency difference power conversion function f (x) is preset in the subtractor 202, and a frequency difference power value is obtained by performing offset calculation through the frequency difference power conversion function f (x).
In this embodiment, the control module 300 includes a controller 301 and a time relay 302, where the controller 301 may be an existing MCIMX6Y2CVM08AB type controller, the time relay 302 may be an existing JSS-72T type time relay, the controller 301 is configured to compare a first constant with a second constant, and a first time value and a second time value are preset in the time relay 302; when the second constant is larger than the first constant and the frequency difference power value is a negative value, the time relay 302 selects a time value with a smaller value between the first time value and the second time value to output the frequency difference power; when the second constant is smaller than the first constant and the frequency difference power value is a positive value, the time relay 302 selects a time value with a larger value between the first time value and the second time value to output the frequency difference power.
In this embodiment, when the frequency difference power value is a negative value, the primary frequency adjustment amount of the valve of the regulating turbine is a negative value, and when the frequency difference power value is a positive value, the primary frequency adjustment amount of the valve of the regulating turbine is a positive value.
In this embodiment, the control module 300 further includes a client 303 and a remote sending unit 304, the remote sending unit 304 is electrically connected to the controller 301 in a bidirectional manner, the remote sending unit 304 provides remote information transmission for the controller 301, and the client 303 establishes a connection with the remote sending unit 304. The controller 301 can be remotely controlled and operated through the client 303 such as a computer or a mobile phone, so that the operation is more convenient, and the working state of the steam turbine can be known conveniently
Example 2
Referring to fig. 1 to 4, a second embodiment of the present invention is a method for controlling a primary frequency modulation time-sharing period of a coal-fired power generating unit, based on the previous embodiment, the method including: s1: setting the rated rotating speed of the steam turbine to be a first constant;
s2: acquiring the actual rotating speed of the steam turbine, and setting the actual rotating speed as a second constant;
s3: comparing the first constant with the second constant, and subtracting the second constant from the first constant to obtain a rotation speed difference value;
s4: calculating to obtain a frequency difference power value through the rotating speed difference value, and performing hysteresis inertia processing on the frequency difference power value;
s5: and outputting the frequency difference power according to the positive and negative values of the power difference value.
S6: and inputting the output frequency difference power unit to a turbine load instruction, adjusting the valve opening of the turbine, and adjusting the actual power of the turbine.
After the primary frequency modulation action, the control strategy design is carried out by taking a time interval of 3s, locking the maximum actual primary frequency modulation amount in the same direction (taking the rated rotating speed of a steam turbine of 3000rpm as an example, if the rotating speed is more than 3000rpm is negative, and if the rotating speed is less than 3000rpm is positive), gradually recovering, and then slowly returning to 0. The second constant and the first constant are input into a subtracter 202, deviation calculation is carried out by the subtracter 202, and the calculated final frequency difference power value is subjected to frequency difference power conversion function F (x).
The function f (x) of the frequency difference power function module 4 is, for example, a 350MW supercritical unit.
| X | rpm | -150 | -14 | -10 | -4 | -2 | 2 | 4 | 10 | 14 | 150 |
| F(x) | MW | -28 | -28 | -22 | -5.5 | 0 | 0 | 5.5 | 22 | 28 | 28 |
Performing lag inertial processing on the initial frequency difference power value, and presetting a first time value and a second time value of the lag inertial processing; comparing the first constant to the second constant; the second constant is larger than the first constant, the frequency difference power value is a negative value, the first time value and the second time value are compared, the time value with the smaller value is selected, the frequency difference power is output, and the primary frequency modulation quantity of the valve of the regulating turbine is a negative value; and the second constant is smaller than the first constant, the frequency difference power value is a positive value, the first time value and the second time value are compared, the time value with a larger value is selected, the frequency difference power is output, and the primary frequency modulation quantity of the valve of the regulating turbine is a positive value.
And performing hysteresis inertia processing on the initial value of the frequency difference power to enable the curve to return to be smoother. The control strategy is that the rotation speed of the steam turbine is compared with 3000rpm for the second constant, the primary frequency modulation quantity which is greater than or equal to the second constant is a negative value, hysteresis and inertia processing (generally 5-18s) are carried out, and finally, small selection output is carried out; the small primary frequency modulation amount is a positive value, hysteresis and inertia processing (generally 5-18s) are carried out, and finally, large selection output is carried out, and finally, frequency difference power is output.
The method realizes the primary frequency modulation process (within 1 min), the primary frequency modulation process is divided into 20 time intervals of 3s approximately, the maximum actual primary frequency modulation amount is selected once in each time interval, the requirements of the rapidity and the frequency modulation amplitude of the primary frequency modulation are ensured, and the stability requirement of the valve caused by the too-fast disturbance is avoided. And when primary frequency modulation regression is carried out, a large value is selected and filtering processing is carried out, so that frequent shaking caused by invalid multi-action adjustment of the high-speed regulating valve is avoided, and the risks of breakage of a valve rod of the high-speed regulating valve of the steam turbine and leakage of an EH oil pipeline caused by primary frequency modulation are greatly reduced.
Example 3
Referring to fig. 5 and 6, a third embodiment of the present invention is based on the above two embodiments, in this embodiment: the first constant modulus value of the rated rotating speed of the steam turbine is set to 3000.
The low-rotation-speed time-sharing switching mode is that the switching is performed every 3S when the rotation speed of the steam turbine is lower than 3000.
The high-rotation-speed time-sharing switching mode is that the switching is performed every 3S when the rotation speed of the steam turbine is higher than 3000.
The high-low speed time-sharing switching mode is that the switching is performed every 3S when the rotating speed of the steam turbine is higher or lower than 3000.
The first lag module time setting is typically 5-18 s.
The second lag module time setting is typically 5-18 s.
The high alarm module 21 has an alarm constant of 3000.
The output end of the turbine rated rotating speed first constant module is connected with a first input end (+) of the subtracter, and the output end of the turbine rotating speed second constant is connected with a second input end (-) of the subtracter, the N end of the fourth switching module and the input end of the high alarm module; the input end of the frequency difference power function module is connected with the output end of the subtracter, and the output end of the frequency difference power function module is connected with the input end of the limit module; the output end of the limit value module is connected with the second input end of the first large selection module and the first input end of the first small selection module; the output end of the DI module in the low-rotation-speed time-sharing switching mode is connected with the S end of the first switching module and the S end of the third switching module; the N end of the first switching module is connected with the output end of the second constant module, and the Y end of the first switching module is connected with the output end of the first large selection module; the first input end of the first large selection module is connected with the output end of the first switching module, and the output end of the first large selection module is connected with the Y end of the third switching module; the output end of the DI block is connected with the S end of the second switching module in a high-rotation-speed time-sharing switching mode, the N end of the second switching module is connected with the output end of the third constant module, and the Y end of the second switching module is connected with the output end of the first small selection module; the output end of the first small selection module is connected with the N end of the third switching module; the Y end of the fourth switching module is connected with the output end of the third switching module, the S end of the fourth switching module is connected with the output end of the DI block in a rotating speed high-low time-sharing switching mode, and the output end of the fourth switching module is respectively connected with the input end of the first hysteresis module, the input end of the second hysteresis module, the first input end of the second large selection module and the first input end of the second small selection module; the second input end of the second large selection module is connected with the output end of the first hysteresis module, and the output end of the second large selection module is connected with the N end of the fifth switching module; the second input end of the second small selection module is connected with the output end of the second hysteresis module, and the output end of the second small selection module is connected with the S end of the fifth switching module; and the output end of the fifth switching module is connected with the input end of the frequency difference power AO block.
It is important to note that the construction and arrangement of the present application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the present invention is not limited to a particular embodiment, but extends to various modifications that nevertheless fall within the scope of the appended claims.
Moreover, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those unrelated to the presently contemplated best mode of carrying out the invention, or those unrelated to enabling the invention).
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without undue experimentation.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. A coal-fired generating set primary frequency modulation timesharing control system which characterized in that:
the acquisition module (100) is used for acquiring the actual rotating speed of the working of the steam turbine, and setting the actual rotating speed as a second constant;
the device comprises a processing module (200), wherein a first constant is preset in the processing module (200), the first constant is compared with a second constant to obtain a rotating speed difference value, and a frequency difference power value is obtained through calculation of the rotating speed difference value;
and the control module (300) performs hysteresis inertia processing on the frequency difference power value, and outputs the frequency difference power according to the positive and negative values of the power difference value.
2. The coal-fired power generating unit primary frequency modulation time period control system of claim 1, wherein: and the control module (300) outputs a frequency difference power unit to a turbine load instruction, adjusts the valve opening of the turbine and adjusts the actual power of the turbine.
3. The coal-fired power generating unit primary frequency modulation time period control system of claim 2, wherein: the processing module (200) comprises a processing chip (201) and a subtracter (202), the acquisition module (100) inputs a second constant into the subtracter (202), after a first constant preset in the processing chip (201) is called, a frequency difference power conversion function F (x) is preset in the subtracter (202), and deviation calculation is carried out through the frequency difference power conversion function F (x) to obtain a frequency difference power value.
4. The coal-fired power generation unit primary frequency modulation time period control system of claim 3, wherein: the control module (300) comprises a controller (301) and a time relay (302), wherein the controller (301) is used for comparing a first constant with a second constant, and a first time value and a second time value are preset in the time relay (302);
when the second constant is larger than the first constant and the frequency difference power value is a negative value, the time relay (302) selects a time value with a smaller value between the first time value and the second time value to output the frequency difference power;
and when the second constant is smaller than the first constant and the frequency difference power value is a positive value, the time relay (302) selects a time value with a larger value between the first time value and the second time value to output the frequency difference power.
5. The coal-fired power generation unit primary frequency modulation time period control system of claim 4, wherein: and when the frequency difference power value is a positive value, the primary frequency modulation quantity of the valve of the regulating turbine is a positive value.
6. The coal-fired power generation unit primary frequency modulation time period control system of claim 5, wherein: the system module (300) further comprises a client (303) and a remote sending unit (304), the remote sending unit (304) is electrically connected with the controller (301) in a bidirectional mode, the remote sending unit (304) provides remote information transmission for the controller (301), and the client (303) is connected with the remote sending unit (304).
7. A coal-fired generator set primary frequency modulation time-interval control method is characterized by comprising the following steps: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
setting the rated rotating speed of the steam turbine to be a first constant;
acquiring the actual rotating speed of the steam turbine, and setting the actual rotating speed as a second constant;
comparing the first constant with the second constant, and subtracting the second constant from the first constant to obtain a rotation speed difference value;
calculating to obtain a frequency difference power value through the rotating speed difference value, and performing hysteresis inertia processing on the frequency difference power value;
and outputting the frequency difference power according to the positive and negative values of the power difference value.
8. The coal-fired power generating unit frequency modulation time interval control method of claim 7, characterized in that: and inputting the output frequency difference power unit to a turbine load instruction, adjusting the valve opening of the turbine, and adjusting the actual power of the turbine.
9. The coal-fired power generating unit frequency modulation time interval control method of claim 8, characterized in that: and inputting the second constant and the first constant into a subtracter (202), performing deviation calculation through the subtracter (202), and calculating the frequency difference power value through a frequency difference power conversion function F (x).
10. The coal-fired power generating unit frequency modulation time interval control method of claim 9, characterized in that: performing lag inertial processing on the initial frequency difference power value, and presetting a first time value and a second time value of the lag inertial processing;
comparing the first constant to the second constant;
the second constant is larger than the first constant, the frequency difference power value is a negative value, the first time value and the second time value are compared, the time value with the smaller value is selected, the frequency difference power is output, and the primary frequency modulation quantity of the valve of the regulating turbine is a negative value;
and the second constant is smaller than the first constant, the frequency difference power value is a positive value, the first time value and the second time value are compared, the time value with a larger value is selected, the frequency difference power is output, and the primary frequency modulation quantity of the valve of the regulating turbine is a positive value.
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