CN117498393A - Peak regulation-heat supply-heat storage association system and cooperative control method thereof - Google Patents
Peak regulation-heat supply-heat storage association system and cooperative control method thereof Download PDFInfo
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- 238000005338 heat storage Methods 0.000 title claims abstract description 38
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- 238000005259 measurement Methods 0.000 claims description 24
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 238000005485 electric heating Methods 0.000 claims description 15
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- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 4
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Classifications
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
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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
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
- F28D2020/0047—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
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- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses a peak regulation-heat supply-heat storage associated system and a cooperative control method thereof, wherein the peak regulation-heat supply-heat storage associated system comprises: the coal-fired reheating unit transmits energy to the molten salt energy storage-energy supply system through steam extraction, and the molten salt energy storage-energy supply system stores the energy through molten salt. The response time scale differences of the thermal power unit, the molten salt energy storage device and the heating system are considered to perform multi-time scale scheduling optimization and cooperative control, so that frequency fluctuation and power fluctuation in an AGC instruction can be compensated simultaneously, and the frequency modulation auxiliary service requirement is met; the feedforward compensation control of the steam extraction quantity is utilized to realize the cooperation of the two targets of power generation and heat supply, the peak regulation depth and speed of the unit are improved, and the heat supply temperature is ensured to be stable. The invention can realize the rapid and stable tracking of the electric and thermal load instructions, can be used as a feasible scheme for modifying the flexibility of the thermal power unit based on the molten salt heat storage technology, and has important significance for improving the auxiliary service capability of the thermal power unit.
Description
Technical Field
The invention belongs to the technical field of automatic control of thermal engineering, and particularly relates to a peak shaving-heat supply-heat storage association system and a cooperative control method thereof.
Background
With the continuous development of social economy, the peak-valley difference of the power grid is enlarged, the randomness of the power load is enhanced, and the demand of the peak regulation and frequency modulation capacity of the power grid is increased. In recent years, new energy power generation technologies such as solar power generation and wind power generation are rapidly developed, and large-scale grid connection of new energy sources brings greater challenges to comprehensive adjustment capability of a power system. The current thermal power generating unit not only serves as a power generation source, but also needs to bear the main task of peak regulation and frequency modulation, but the peak regulation depth of the unit is limited, and the frequent frequency modulation also has the safety problem.
On the other hand, central heating is an important field of social energy consumption and carbon emission, and under the targets of carbon peak, carbon neutralization, the promotion of efficient cogeneration central heating is a main direction of future heating transformation.
In addition, the energy storage technology is developed under the double pushing of requirements and policies, and among a plurality of energy storage technologies, the molten salt energy storage has the advantages of large capacity, low cost and the like, and has been applied to power generation side scenes such as photo-thermal power generation, thermal power generating unit flexibility transformation and the like.
At present, the research on the control method of the fire storage coupling system is less, particularly, the research under the auxiliary service requirement and the heat supply requirement of the electric power system is comprehensively considered, the control of an execution layer is often not considered in the current research, and the characteristics of large inertia and strong coupling of the fire storage system are not considered, so that a reasonable fire storage system cooperative control method is necessary to be provided, the storage utilization rate of a heat storage device is improved, and the peak regulation performance and the heat supply quality of a unit are improved.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a peak shaving-heat supply-heat storage association system and a cooperative control method thereof, which can improve the peak shaving capacity of a thermal power unit and simultaneously meet the heat supply requirement born by the thermal power unit.
In order to achieve the above purpose, the present invention adopts the following technical scheme: a peak shaving-heating-thermal storage correlation system comprising: the system comprises a coal-fired reheating unit and a molten salt energy storage-energy supply system, wherein the coal-fired reheating unit transmits energy to the molten salt energy storage-energy supply system through steam extraction, and the molten salt energy storage-energy supply system stores energy through molten salt;
the fire coal reheating unit comprises: the system comprises a boiler, a main steam valve, a steam turbine, a reheat steam extraction valve, a condenser, a water supply pump and a generator, wherein the output end of the condenser is connected with the input end of the boiler through the water supply pump; the output end of the steam turbine is connected with the input end of the condenser, and the generator is connected with the steam turbine;
the molten salt energy storage-supply system includes: the system comprises a molten salt-steam extraction heat exchanger, a high-temperature molten salt storage tank, a high-temperature molten salt pump, a molten salt-heat network circulating water heat exchanger, a low-temperature molten salt storage tank, a low-temperature molten salt pump and an electric heating device; the electric heating device and a molten salt conveying pipeline of the molten salt-heat network circulating water heat exchanger form a loop, a molten salt side output end of the molten salt-heat network circulating water heat exchanger is connected with an input end of a low-temperature molten salt storage tank, an output end of the low-temperature molten salt storage tank is connected with a molten salt side input end of the molten salt-steam extraction heat exchanger through a low-temperature molten salt pump, a molten salt side output end of the molten salt-steam extraction heat exchanger is connected with an input end of a high-temperature molten salt storage tank, and an output end of the high-temperature molten salt storage tank is connected with a molten salt side input end of the molten salt-heat network circulating water heat exchanger through a high-temperature molten salt pump.
Further, the molten salt energy storage-supply system adopts any one of nitro binary molten salt and nitro ternary molten salt.
Further, the invention also provides a cooperative control method of the peak shaving-heat supply-heat storage association system, which specifically comprises the following steps:
step 1, acquiring an electric and thermal load day-ahead plan, and solving a heating steam extraction set value and a thermal salt flow set value by planning thermal load scheduling;
step 2, obtaining an AGC instruction signal, obtaining a low-frequency signal and a high-frequency signal through signal decomposition, combining a sampled power generation power measurement value, a reheat extraction measurement value and a heating extraction set value, and obtaining a low-frequency signal deviation value and a high-frequency signal deviation value through electric heat conversion transfer function and electric heat conversion steady gain through calculation;
step 3, sampling a reheat extraction steam measurement value and a hot salt flow set value, wherein the reheat extraction steam measurement value generates compensation quantity through a feedforward controller, and taking the sum of the compensation quantity and the hot salt flow set value as a compensated hot salt flow set value;
step 4, sending the low-frequency signal deviation value to a first controller to obtain fuel quantity, sending the high-frequency signal deviation value to a second controller to obtain the opening of a reheat extraction valve, sending a main steam pressure set value to a third controller to obtain the opening of the main steam valve, sending a compensated hot salt flow set value to a fourth controller to obtain the rotating speed of a hot salt pump, sending a hot salt outlet temperature set value to a fifth controller to obtain electric heating power, and sending a heating instruction to a sixth controller to obtain the rotating speed of a cold salt pump;
step 5, the fuel quantity, the opening of the reheating steam extraction valve and the opening of the main steam valve are sent to an actuating mechanism of the coal-fired reheating unit in a command form, and the power generation power, the reheating steam extraction quantity and the main steam pressure are respectively controlled; and sending the obtained hot salt pump rotating speed, electric heating power and cold salt pump rotating speed to an actuating mechanism of the molten salt energy storage-energy supply system in a command form, and respectively controlling the hot salt flow, the hot salt outlet temperature and the heat supply.
Further, the process for obtaining the heating steam extraction set value and the hot salt flow set value in the step 1 is as follows:
min f＝∑C fuel q B，i
wherein Load i Represents the power generation planned value at the i-th time, Q Load，i Represents the heating plan value at the i-th time, q B，i Indicating the fuel quantity at the i-th time, P e，i Represents the electric heating power at the i-th moment, Q TES，i Indicating the heat storage amount, de at the i-th time sp，i Represents the heating steam extraction set value, NE, at the i-th moment cap Represents rated power of the fire coal reheating unit, Q cap The rated capacity of a molten salt energy storage-supply system is represented, eta represents the power generation efficiency of a coal-fired reheat unit, K represents the reheat steam extraction electrothermal conversion steady-state gain, K' represents the molten salt electrothermal conversion steady-state gain, D sp，1，i The hot salt flow set value at the i-th time is shown,represents the low calorific value of fuel, Q TEScap，i Representing the heat storage capacity of the high-temperature molten salt heat storage tank at the ith moment, C fuel Representing fuel cost, f represents a thermal load scheduling objective function.
Further, step 2 comprises the following sub-steps:
step 201, decomposing the AGC instruction signal by an aggregate empirical mode decomposition method:wherein X (t) represents an AGC command signal to be decomposed, h j (t) represents the jth order natural modal component of the AGC command signal to be decomposed, r n (t) represents a decomposition remainder, n being a decomposition order;
step 202, using the sum of the natural mode components with the decomposition order of d or less as the high-frequency signalThe sum of the natural mode component with the decomposition order larger than d and the remainder is used as the low frequency signal +.>
Step 203, combining the high-frequency signal with the sampled reheat extraction measurement De, and the reheat extraction measurement De at the previous time 0 And a heating extraction set point De sp The high-frequency signal deviation value e is calculated through the electrothermal conversion transfer function G(s) and the electrothermal conversion steady-state gain K f ：
e f ＝Load f -[G(s)(De-De 0 )]+K(De sp -De)
Step 204, combining the low-frequency signal with the sampled power generation measurement value NE and the reheat extraction measurement value De, and calculating the low-frequency signal deviation value e through the electrothermal conversion transfer function G(s) s ：
e s ＝Load s -[NE-G(s)(De-De 0 )]。
Further, the electrothermal conversion transfer function G(s) is expressed as:
where T is the electrothermal conversion inertia time and s is the laplace transform complex variable.
Further, the first controller, the second controller, the third controller, the fourth controller, the fifth controller and the sixth controller all adopt any single-loop feedback controller mode.
Further, the invention also provides a computer readable storage medium storing a computer program, the computer program causes a computer to execute the cooperative control method of the peak shaving-heat supply-heat storage correlation system.
Further, the present invention also provides an electronic device, including: the system comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor realizes the cooperative control method of the peak shaving-heat supply-heat storage association system when executing the computer program.
Compared with the prior art, the invention has the following beneficial effects: the peak regulation-heat supply-heat storage association system and the cooperative control method thereof take the response time scale differences of the thermal power unit, the molten salt energy storage device and the heat supply system into consideration, perform multi-time scale scheduling optimization and cooperative control, and have good performance: based on AGC load instruction decomposition, the rapidity and the accuracy of the steam extraction, lifting, peak regulation and frequency modulation control are adopted, so that the frequency fluctuation and the power fluctuation in the AGC instruction can be compensated simultaneously, and the frequency modulation auxiliary service requirement is met; and the feedforward compensation control of the steam extraction quantity is utilized to realize the cooperation of the two targets of power generation and heat supply, the peak regulation depth and speed of the unit are improved, and the heat supply temperature is ensured to be stable. The control method provided by the invention can realize the rapid and stable tracking of the electric and thermal load instructions, can be used as a feasible scheme for modifying the flexibility of the thermal power unit based on the molten salt heat storage technology, and has important significance for improving the auxiliary service capability of the thermal power unit.
Drawings
FIG. 1 is a schematic diagram of a peak shaving-heat supply-heat storage correlation system in the invention;
FIG. 2 is a schematic diagram of the coordinated control of a peak shaving-heating-heat storage correlation system for implementing the method of the present invention;
FIG. 3 is a graph showing the control effect of tracking the large-range AGC command generated power under the cooperative control method of the present invention;
FIG. 4 is a graph of the effect of tracking a large range of AGC commanded main steam pressure control under the cooperative control method of the present invention;
FIG. 5 is a graph showing the control effect of tracking large-range AGC commands on high-frequency generated power under the cooperative control method of the present invention;
FIG. 6 is a graph showing the control effect of the AGC command generated power of the tracking slope under the cooperative control method of the present invention;
FIG. 7 is a graph of the main vapor pressure control effect of the tracking ramp AGC command under the cooperative control method of the present invention;
FIG. 8 is a graph of the heat supply control effect of tracking a wide range of heat load commands under the cooperative control method of the present invention;
FIG. 9 is a graph showing the effect of tracking the temperature of a wide range of thermal load command thermal salt outlet under the cooperative control method of the present invention.
Detailed Description
The technical scheme of the invention is described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a peak shaving-heat supply-heat storage related system according to the present invention, the peak shaving-heat storage-heat supply related system comprising: the coal-fired reheating unit 1 and the molten salt energy storage-energy supply system 2 are used for transmitting energy to the molten salt energy storage-energy supply system 2 through steam extraction, and the molten salt energy storage-energy supply system 2 is used for storing energy to a high-temperature molten salt storage tank through molten salt and transmitting energy to a molten salt-heat network circulating water heat exchanger.
The coal reheating unit 1 of the present invention comprises: the device comprises a boiler, a main steam valve, a steam turbine, a reheat steam extraction valve, a condenser, a water feeding pump and a generator, wherein the output end of the condenser is connected with the input end of the boiler through the water feeding pump; the output end of the steam turbine is connected with the input end of the condenser, and the generator is connected with the steam turbine.
The molten salt energy storage-supply system 2 of the present invention includes: the system comprises a molten salt-steam extraction heat exchanger, a high-temperature molten salt storage tank, a high-temperature molten salt pump, a molten salt-heat network circulating water heat exchanger, a low-temperature molten salt storage tank, a low-temperature molten salt pump and an electric heating device; the electric heating device and a molten salt conveying pipeline of the molten salt-heat network circulating water heat exchanger form a loop, a molten salt side output end of the molten salt-heat network circulating water heat exchanger is connected with an input end of a low-temperature molten salt storage tank, an output end of the low-temperature molten salt storage tank is connected with a molten salt side input end of the molten salt-steam extraction heat exchanger through a low-temperature molten salt pump, a molten salt side output end of the molten salt-steam extraction heat exchanger is connected with an input end of a high-temperature molten salt storage tank, and an output end of the high-temperature molten salt storage tank is connected with a molten salt side input end of the molten salt-heat network circulating water heat exchanger through a high-temperature molten salt pump. The molten salt energy storage-supply system adopts any one of nitro binary molten salt and nitro ternary molten salt.
The peak regulation-heat storage-heat supply association system adopts a double-tank direct design, and utilizes reheat steam extraction to heat and store molten salt through a molten salt-steam extraction heat exchanger, when heat supply is needed, the heat energy of the molten salt is transferred to a heat supply pipe network through the molten salt-heat network circulating water heat exchanger, and then the heat energy is finally transferred to a user side through each heat exchange station of the user side.
As shown in fig. 2, the invention further provides a cooperative control method of a peak regulation-heat supply-heat storage association system, which is used for ensuring the generated energy of the coal-fired reheating unit, the heat storage and release amount of a molten salt energy storage system in a molten salt energy storage-energy supply system and the heat supply amount in the energy supply system to meet the electric load and heat load demands, and specifically comprises the following steps:
step 1, acquiring an electric and thermal load day-ahead plan, solving a heat supply steam extraction set value and a thermal salt flow set value by planning thermal load scheduling, and planning an integral operation strategy of a peak regulation-heat supply-heat storage association system in advance by planning the electric and thermal load day-ahead plan to give a reference set value of heat supply steam extraction and thermal salt flow for a coal-fired reheat unit and a molten salt energy storage-heat supply system, so that the association system tracks the operation of the reference set value in the day.
The process for obtaining the set value of the heat supply steam extraction and the set value of the heat salt flow in the invention comprises the following steps:
min f＝∑C fuel q B，i
wherein Load i Represents the power generation planned value at the i-th time, Q Load，i Represents the heating plan value at the i-th time, q B，i Indicating the fuel quantity at the i-th time, P e，i Represents the electric heating power at the i-th moment, Q TES，i Indicating the heat storage amount, de at the i-th time sp，i Represents the heating steam extraction set value, NE, at the i-th moment cap Represents rated power of the fire coal reheating unit, Q cap The rated capacity of a molten salt energy storage-supply system is represented, eta represents the power generation efficiency of a coal-fired reheat unit, K represents the reheat steam extraction electrothermal conversion steady-state gain, K' represents the molten salt electrothermal conversion steady-state gain, D sp，1，i The hot salt flow set value at the i-th time is shown,represents the low calorific value of fuel, Q TEScap，i Representing the heat storage capacity of the high-temperature molten salt heat storage tank at the ith moment, C fuel Representing fuel cost, f represents a thermal load scheduling objective function.
Step 2, obtaining an AGC instruction signal, obtaining a low-frequency signal and a high-frequency signal through signal decomposition, combining a sampled power generation power measurement value, a reheat extraction measurement value and a heating extraction set value, and obtaining a low-frequency signal deviation value and a high-frequency signal deviation value through electric heat conversion transfer function and electric heat conversion steady gain through calculation; the AGC instruction decomposition considers the response time scale difference of the coal-fired reheating unit and the molten salt energy storage-heating system, the change of the steam extraction quantity can rapidly influence the power generation, the influence of the fuel quantity is slower, and the rapidity and the accuracy of the peak regulation frequency modulation control are improved by the steam extraction; the method specifically comprises the following substeps:
step 201, decomposing the AGC instruction signal by an aggregate empirical mode decomposition method:wherein X (t) represents an AGC command signal to be decomposed,h j (t) represents the jth order natural modal component of the AGC command signal to be decomposed, r n (t) represents a decomposition remainder, n being a decomposition order;
step 202, using the sum of the natural mode components with the decomposition order of d or less as the high-frequency signalThe sum of the natural mode component with the decomposition order larger than d and the remainder is used as the low frequency signal +.>
Step 203, combining the high-frequency signal with the sampled reheat extraction measurement De, and the reheat extraction measurement De at the previous time 0 And a heating extraction set point De sp The high-frequency signal deviation value e is calculated through the electrothermal conversion transfer function G(s) and the electrothermal conversion steady-state gain K f ：
e f ＝Load f -[G(s)(De-De 0 )]+K(De sp -De)
Step 204, combining the low-frequency signal with the sampled power generation measurement value NE and the reheat extraction measurement value De, and calculating the low-frequency signal deviation value e through the electrothermal conversion transfer function G(s) s ：
e s ＝Load s -[NE-G(s)(De-De 0 )]。
The electrothermal conversion transfer function G(s) is expressed as:
where T is the electrothermal conversion inertia time and s is the laplace transform complex variable.
And 3, sampling a reheat steam extraction measurement value and a hot salt flow set value, wherein the reheat steam extraction measurement value generates a compensation quantity through a feedforward controller, taking the sum of the compensation quantity and the hot salt flow set value as a compensated hot salt flow set value, and realizing control rapidness and accuracy by combining the influence of peak regulation steam extraction of a coal-fired reheat unit, the hot salt flow of molten salt energy storage and the temperature feedback control of a hot salt outlet by using the reheat steam extraction feedforward controller, and realizing cooperative control of peak regulation and heat supply of a peak regulation-heat supply-heat storage correlation system by using steam extraction feedforward.
Step 4, sending the low-frequency signal deviation value to a first controller to obtain fuel quantity, sending the high-frequency signal deviation value to a second controller to obtain the opening of a reheat extraction valve, sending a main steam pressure set value to a third controller to obtain the opening of the main steam valve, sending a compensated hot salt flow set value to a fourth controller to obtain the rotating speed of a hot salt pump, sending a hot salt outlet temperature set value to a fifth controller to obtain electric heating power, and sending a heating instruction to a sixth controller to obtain the rotating speed of a cold salt pump;
step 5, the fuel quantity, the opening of the reheating steam extraction valve and the opening of the main steam valve are sent to an actuating mechanism of the coal-fired reheating unit in a command form, and the power generation power, the reheating steam extraction quantity and the main steam pressure are respectively controlled; and sending the obtained hot salt pump rotating speed, electric heating power and cold salt pump rotating speed to an actuating mechanism of the molten salt energy storage-energy supply system in a command form, and respectively controlling the hot salt flow, the hot salt outlet temperature and the heat supply.
In the invention, the first controller, the second controller, the third controller, the fourth controller, the fifth controller and the sixth controller all adopt any single-loop feedback controller form, for example, the first controller, the second controller, the third controller, the fourth controller, the fifth controller and the sixth controller are all PID controllers, and the control algorithm is as follows:
where e is the deviation, u is the control amount, kp is the proportional gain coefficient, ki is the integral gain coefficient, and Kd is the differential gain coefficient.
In order to verify the actual effect of the method, programming the method of the invention in a MATLAB R2019b simulation environment, and performing a simulation experiment.
In order to verify the peak shaving control effect of the invention, the following experiment is carried out: under a large-range AGC instruction for a period of time, verifying the load tracking effect and the stability degree of the main steam pressure; under the load lifting AGC command of 2% per minute, verifying the load tracking speed and accuracy; the cooperative control method provided by the invention is compared with the traditional turbine following control method.
As shown in FIG. 3, the cooperative control method of the invention can better respond to some high-frequency load fluctuation due to the addition of reheat steam extraction control, and the traditional control method used as a comparison only carries out load change through boiler side regulation, so that certain delay and inertia exist; as shown in fig. 4, the pressure fluctuation of the cooperative control method of the present invention is slightly small; as shown in fig. 5, the high-frequency part of the load signal can be well tracked by extracting steam; as shown in FIG. 6, the cooperative control method of the invention has obviously larger tracking rate at the initial stage of slope disturbance, and has higher adjustment rate and adjustment precision; as shown in fig. 7, the primary steam pressure of the slope tracking of the cooperative control method of the present invention fluctuates less.
In order to verify the heating control effect of the invention, the following experiment is carried out: under the heat load instruction for a period of time, verifying the heat supply tracking effect and the stability degree of the temperature of the hot salt outlet, and comparing the control method provided by the invention with a control method which only adopts the feedforward of the steam extraction.
As shown in fig. 8, the cooperative control method of the present invention realizes fast and stable tracking of the thermal load signal; as shown in fig. 9, the cooperative control method can control the heat supply temperature fluctuation in the peak regulation and frequency modulation process to the minimum amplitude, and ensures the stability of the temperature of the hot salt outlet.
In summary, the coordinated control method of the peak shaving-heat storage-heat supply association system provided by the invention comprehensively considers peak shaving and heat supply requirements, provides a thermal power unit flexibility transformation scheme based on a molten salt heat storage technology, and designs the coordinated control method based on characteristic differences of all parts of the system. Simulation research results show that the cooperative control method provided by the invention has good performance, improves the peak regulation depth and speed of the unit, ensures the stable heating temperature, realizes the rapid and stable tracking of electric and thermal load instructions, and can be used as a feasible scheme for modifying the flexibility of the thermal power unit based on the molten salt heat storage technology.
In the technical scheme of the invention, a computer readable storage medium is also provided, and a computer program is stored, wherein the computer program enables a computer to execute the cooperative control method of the peak regulation-heat supply-heat storage association system.
In the technical scheme of the invention, the invention also provides electronic equipment, which comprises: the system comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor realizes the cooperative control method of the peak shaving-heat supply-heat storage association system when executing the computer program.
In the embodiments disclosed herein, a computer storage medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The computer storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a computer storage medium would include one or more wire-based electrical connections, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the invention without departing from the principles thereof are intended to be within the scope of the invention as set forth in the following claims.
Claims (9)
1. A peak shaving-heating-thermal storage correlation system, comprising: the system comprises a coal-fired reheating unit and a molten salt energy storage-energy supply system, wherein the coal-fired reheating unit transmits energy to the molten salt energy storage-energy supply system through steam extraction, and the molten salt energy storage-energy supply system stores energy through molten salt;
the fire coal reheating unit comprises: the system comprises a boiler, a main steam valve, a steam turbine, a reheat steam extraction valve, a condenser, a water supply pump and a generator, wherein the output end of the condenser is connected with the input end of the boiler through the water supply pump; the output end of the steam turbine is connected with the input end of the condenser, and the generator is connected with the steam turbine;
the molten salt energy storage-supply system includes: the system comprises a molten salt-steam extraction heat exchanger, a high-temperature molten salt storage tank, a high-temperature molten salt pump, a molten salt-heat network circulating water heat exchanger, a low-temperature molten salt storage tank, a low-temperature molten salt pump and an electric heating device; the electric heating device and a molten salt conveying pipeline of the molten salt-heat network circulating water heat exchanger form a loop, a molten salt side output end of the molten salt-heat network circulating water heat exchanger is connected with an input end of a low-temperature molten salt storage tank, an output end of the low-temperature molten salt storage tank is connected with a molten salt side input end of the molten salt-steam extraction heat exchanger through a low-temperature molten salt pump, a molten salt side output end of the molten salt-steam extraction heat exchanger is connected with an input end of a high-temperature molten salt storage tank, and an output end of the high-temperature molten salt storage tank is connected with a molten salt side input end of the molten salt-heat network circulating water heat exchanger through a high-temperature molten salt pump.
2. The peak shaving-heat supply-heat storage associated system according to claim 1, wherein the molten salt energy storage-supply system is any one of a nitro-type binary molten salt and a nitro-type ternary molten salt.
3. A coordinated control method of a peak shaving-heating-heat storage association system according to claim 1, comprising the steps of:
step 1, acquiring an electric and thermal load day-ahead plan, and solving a heating steam extraction set value and a thermal salt flow set value by planning thermal load scheduling;
step 2, obtaining an AGC instruction signal, obtaining a low-frequency signal and a high-frequency signal through signal decomposition, combining a sampled power generation power measurement value, a reheat extraction measurement value and a heating extraction set value, and obtaining a low-frequency signal deviation value and a high-frequency signal deviation value through electric heat conversion transfer function and electric heat conversion steady gain through calculation;
step 3, sampling a reheat extraction steam measurement value and a hot salt flow set value, wherein the reheat extraction steam measurement value generates compensation quantity through a feedforward controller, and taking the sum of the compensation quantity and the hot salt flow set value as a compensated hot salt flow set value;
step 4, sending the low-frequency signal deviation value to a first controller to obtain fuel quantity, sending the high-frequency signal deviation value to a second controller to obtain the opening of a reheat extraction valve, sending a main steam pressure set value to a third controller to obtain the opening of the main steam valve, sending a compensated hot salt flow set value to a fourth controller to obtain the rotating speed of a hot salt pump, sending a hot salt outlet temperature set value to a fifth controller to obtain electric heating power, and sending a heating instruction to a sixth controller to obtain the rotating speed of a cold salt pump;
step 5, the fuel quantity, the opening of the reheating steam extraction valve and the opening of the main steam valve are sent to an actuating mechanism of the coal-fired reheating unit in a command form, and the power generation power, the reheating steam extraction quantity and the main steam pressure are respectively controlled; and sending the obtained hot salt pump rotating speed, electric heating power and cold salt pump rotating speed to an actuating mechanism of the molten salt energy storage-energy supply system in a command form, and respectively controlling the hot salt flow, the hot salt outlet temperature and the heat supply.
4. The cooperative control method of a peak shaving-heat supply-heat storage related system according to claim 3, wherein the process of obtaining the heat supply steam extraction set value and the heat salt flow set value in the step 1 is as follows:
minf＝∑C fuel q B,i
wherein Load i Represents the power generation planned value at the i-th time, Q Load,i Represents the heating plan value at the i-th time, q B,i Indicating the fuel quantity at the i-th time, P e,i Represents the electric heating power at the i-th moment, Q TES,i Indicating the heat storage amount, de at the i-th time sp,i Represents the heating steam extraction set value, NE, at the i-th moment cap Represents rated power of the fire coal reheating unit, Q cap The rated capacity of a molten salt energy storage-supply system is represented, eta represents the power generation efficiency of a coal-fired reheat unit, K represents the reheat steam extraction electrothermal conversion steady-state gain, K' represents the molten salt electrothermal conversion steady-state gain, ds sp,1,i The hot salt flow set value at the i-th time is shown,represents the low calorific value of fuel, Q TEScap,i Representing the heat storage capacity of the high-temperature molten salt heat storage tank at the ith moment, C fuel Representing fuel cost, f represents a thermal load scheduling objective function.
5. A method for cooperative control of a peak shaving-heating-thermal storage correlation system according to claim 3, wherein step 2 comprises the sub-steps of:
step 201, decomposing the AGC instruction signal by an aggregate empirical mode decomposition method:wherein X (t) represents a substance to be separatedSolution of AGC command signal, h j (t) represents the jth order natural modal component of the AGC command signal to be decomposed, r n (t) represents a decomposition remainder, n being a decomposition order;
step 202, using the sum of the natural mode components with the decomposition order of d or less as the high-frequency signalThe sum of the natural mode component with the decomposition order larger than d and the remainder is used as the low frequency signal +.>
Step 203, combining the high-frequency signal with the sampled reheat extraction measurement De, and the reheat extraction measurement De at the previous time 0 And a heating extraction set point De sp The high-frequency signal deviation value e is calculated through the electrothermal conversion transfer function G(s) and the electrothermal conversion steady-state gain K f ：
e f ＝Load f -[G(s)(De-De 0 )]+K(De sp -De)
Step 204, combining the low-frequency signal with the sampled power generation measurement value NE and the reheat extraction measurement value De, and calculating the low-frequency signal deviation value e through the electrothermal conversion transfer function G(s) s ：
e s ＝Load s -[NE-G(s)(De-De 0 )]。
6. The cooperative control method of a peak shaving-heat supply-heat storage related system according to claim 5, wherein the electrothermal conversion transfer function G(s) is expressed as:
where T is the electrothermal conversion inertia time and s is the laplace transform complex variable.
7. A coordinated control method of a peak shaving-heating-thermal storage correlation system according to claim 3, wherein the first controller, the second controller, the third controller, the fourth controller, the fifth controller and the sixth controller are all in the form of any single-loop feedback controllers.
8. A computer-readable storage medium storing a computer program, wherein the computer program causes a computer to execute the cooperative control method of the peak shaving-heat supply-heat storage correlation system according to any one of claims 1 to 7.
9. An electronic device, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the cooperative control method of the peak shaving-heating-thermal storage correlation system according to any one of claims 1 to 7 when the computer program is executed.
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