CN218102597U - Frequency modulation system of conventional and standby hybrid energy storage auxiliary thermal power generating unit - Google Patents
Frequency modulation system of conventional and standby hybrid energy storage auxiliary thermal power generating unit Download PDFInfo
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- CN218102597U CN218102597U CN202221657709.5U CN202221657709U CN218102597U CN 218102597 U CN218102597 U CN 218102597U CN 202221657709 U CN202221657709 U CN 202221657709U CN 218102597 U CN218102597 U CN 218102597U
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- 238000004146 energy storage Methods 0.000 title claims abstract description 252
- 238000010248 power generation Methods 0.000 claims abstract description 35
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- 238000004804 winding Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 3
- 230000004044 response Effects 0.000 abstract description 12
- 230000009194 climbing Effects 0.000 abstract description 5
- 230000008859 change Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000000875 corresponding effect Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
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- 230000018109 developmental process Effects 0.000 description 1
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- 230000005619 thermoelectricity Effects 0.000 description 1
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Stand-By Power Supply Arrangements (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The utility model relates to a power transmission technical field especially relates to a conventional thermal power unit frequency modulation system is assisted with reserve mixed energy storage that adds. Wherein, this conventional adds supplementary thermal power unit frequency modulation system of reserve hybrid energy storage, includes: the system comprises a thermal power generation grid-connected unit, a standby energy storage unit of a starting transformer and a conventional energy storage unit of a high-rise transformer; the high-voltage side of the thermal power generation grid-connected unit is connected to the high-voltage side of the standby energy storage unit, and the low-voltage side of the thermal power generation grid-connected unit is connected to the low-voltage side of the standby energy storage unit and the conventional energy storage unit of the high-voltage plant. Adopt above-mentioned scheme the utility model provides a response speed is fast when carrying out the frequency modulation task for the supplementary thermal power generating unit frequency modulation system of conventional and reserve mixed energy storage, and unit climbing speed is high.
Description
Technical Field
The utility model relates to a power transmission technical field especially relates to a conventional thermal power unit frequency modulation system is assisted with reserve mixed energy storage that adds.
Background
Along with the increase of the grid-connected quantity of wind power and conventional energy storage, the rapid development of an interconnected large power grid, large-capacity power generation and long-distance power transmission, the frequency modulation task of a power system is heavier. In the related technology, the frequency modulation power supply mainly comprises a thermal power generating unit and a hydroelectric generating unit, and the working principle is that the frequency change of the system is tracked by adjusting the active output of the units. However, the thermal power generating unit generally has the problems of long response time lag, low unit climbing rate and the like, can not accurately track a power grid dispatching instruction, and exposes the phenomena of adjusting time delay, adjusting deviation, adjusting reversal and the like. In addition, the thermal power generating unit frequently changes power to operate, fatigue and abrasion of the unit equipment are aggravated to a certain extent, and the operation life of the unit is influenced.
Disclosure of Invention
The utility model provides a conventionality adds supplementary thermal power unit frequency modulation system of reserve hybrid energy storage, main aim at provides that response speed is fast when carrying out the frequency modulation task, and the high conventionality of unit climbing speed adds supplementary thermal power unit frequency modulation system of reserve hybrid energy storage.
According to the utility model discloses an aspect provides a conventional thermal power unit frequency modulation system is assisted with reserve mixed energy storage that adds, include: the system comprises a thermal power generation grid-connected unit, a standby energy storage unit of a starting transformer and a conventional energy storage unit of a high-rise transformer;
the high-voltage side of the thermal power generation grid-connected unit is connected to the high-voltage side of the standby energy storage unit of the starting transformer, and the low-voltage side of the thermal power generation grid-connected unit is connected to the low-voltage side of the standby energy storage unit of the starting transformer and the conventional energy storage unit of the high-voltage power plant transformer.
Optionally, in an embodiment of the present invention, the thermal power generation grid-connected unit includes: the system comprises a generator, a generator main transformer and a power grid transmission bus;
the outlet of the generator is connected to the low-voltage side of the main transformer of the generator, and the high-voltage side of the main transformer of the generator is connected to the power transmission bus of the power grid;
the outlet of the generator is the low-voltage side of the thermal power generation grid-connected unit, and the power grid transmission bus is the high-voltage side of the thermal power generation grid-connected unit.
Optionally, in an embodiment of the present invention, the voltage level corresponding to the electric energy output by the generator is 20kV.
Optionally, in an embodiment of the present invention, the voltage level of the power grid transmission bus is 220kV.
Optionally, in an embodiment of the present invention, the backup energy storage unit includes: the system comprises a thermal power generating unit starting transformer, a starting low-voltage side A branch bus, a starting low-voltage side B branch bus, a starting low-voltage side A branch circuit breaker, a standby energy storage boosting transformer, a standby energy storage grid-connected circuit breaker, a standby energy storage converter and standby energy storage equipment;
wherein the low-voltage side of the thermal power generating unit starting transformer is connected to the starting transformer low-voltage side A branch bus and the starting transformer low-voltage side B branch bus, the starting transformer low-voltage side A branch bus is connected to the outlet of the generator through the starting transformer low-voltage side A branch breaker, the starting transformer low-voltage side B branch bus is connected to the standby energy storage step-up transformer, the standby energy storage step-up transformer is connected to the alternating current side of the standby energy storage converter through the standby energy storage grid-connected breaker, and the direct current side of the standby energy storage converter is connected to the standby energy storage equipment;
the high-voltage side that thermal power unit started to be equipped with becomes the high-voltage side that starts to be equipped with and becomes reserve energy storage unit, it is connected to start to be equipped with the one end that becomes the export of low-voltage side A branch circuit breaker be the low pressure side that starts to be equipped with and becomes reserve energy storage unit.
Optionally, in an embodiment of the present invention, the high-plant-to-conventional energy storage unit includes: the system comprises a split winding high-voltage transformer, a 6kV factory A branch, a 6kV factory B branch, a 6kV factory A branch breaker, a 6kV factory A branch load, a 6kV factory B branch breaker, a 6kV factory B branch load, a conventional energy storage power electronic transformer PET grid-connected breaker, PET, a conventional energy storage PET low-voltage side breaker, a conventional energy storage converter and conventional energy storage equipment;
wherein, the high pressure side that the high factory of split winding becomes is connected to the export of generator, the low pressure side that the high factory of split winding becomes is connected to 6kV factory with A branch with 6kV factory with B branch, 6kV factory with A branch passes through 6kV factory with A branch circuit breaker is connected to 6kV factory with A branch load, 6kV factory with B branch passes through 6kV factory with B branch circuit breaker is connected to 6kV factory with B branch load, PET's high-pressure side passes through conventional energy storage PET is incorporated into the power networks the circuit breaker and is connected to 6kV factory with B branch, PET's low pressure side passes through conventional energy storage PET low pressure side circuit breaker is connected to conventional energy storage transverter's alternating current side, conventional energy storage transverter's direct current side is connected to conventional energy storage equipment.
Optionally, in an embodiment of the present invention, the PET includes: the system comprises a conventional energy storage PET high-voltage direct-alternating current converter, a conventional energy storage PET high-voltage side filter capacitor, a conventional energy storage PET high-frequency direct current-direct current DC-DC transformer, a conventional energy storage PET low-voltage side filter capacitor and a conventional energy storage PET low-voltage alternating-direct current converter;
wherein the alternating current side of the conventional energy storage PET high-voltage DC-DC converter is connected to the conventional energy storage PET grid-connected breaker, the high-voltage side of the conventional energy storage PET high-frequency DC-DC transformer is connected to the direct current side of the conventional energy storage PET high-voltage DC-DC converter through the conventional energy storage PET high-voltage side filter capacitor, the direct current side of the conventional energy storage PET low-voltage AC-DC converter is connected to the low-voltage side of the conventional energy storage PET high-frequency DC-DC converter through the conventional energy storage PET low-voltage side filter capacitor, and the alternating current side of the conventional energy storage PET low-voltage AC-DC converter is connected to the conventional energy storage PET low-voltage side breaker.
Optionally, in an embodiment of the present invention, the PET is composed of modular multilevel converter MMC power electronic components.
To sum up, the embodiment of the utility model provides a technical scheme brings following beneficial effect at least:
1. the utility model discloses an adopt and open reserve energy storage unit of change and high factory become the supplementary conventionality of energy storage that conventional energy storage unit constitutes with reserve hybrid energy storage auxiliary thermal power generating unit frequency modulation system, can improve the conventionality and add the response speed of reserve hybrid energy storage auxiliary thermal power generating unit frequency modulation system when carrying out the frequency modulation task, can improve unit climbing speed.
2. The utility model discloses an utilize reserve energy storage equipment and conventional energy storage equipment's quick charge/discharge capacity, the response electric wire netting load changes, no matter be primary control, secondary control or frequency modulation many times, can all assist the thermoelectricity electricity generation unit of being incorporated into the power networks to carry out the optimum power and match. Therefore, the frequency modulation benefit of the thermal power plant can be improved, the output fluctuation of the generator can be reduced, the safety of the thermal power unit can be improved, and the aging of the thermal power unit equipment caused by frequent load adjustment can be reduced. The number of times of power conversion operation can be reduced; furthermore, the fatigue degree and the abrasion degree of the thermal power unit equipment can be reduced, and the service life of the thermal power unit equipment can be prolonged.
3. The utility model discloses an adopt PET, can improve the conventional energy storage power supply efficiency that the factory becomes conventional energy storage unit, can practice thrift the energy storage system construction cost that the high factory becomes conventional energy storage unit. And, the utility model discloses an adopt PET, in response unit frequency modulation, can improve the speed and the accuracy of power change.
4. The utility model discloses a PET adopt high frequency electromagnetic coupling technique, on the basis of functions such as the voltage level transform of realizing traditional transformer, isolation, can also vary voltage in a flexible way, can effectively reduce transformer area and volume.
5. The utility model discloses a PET constitute by MMC power electronic components, MMC power electronic components output harmonic low, electric energy conversion efficiency is high, have higher expansibility. The MMC power electronic component has controllable voltage conversion, can effectively inhibit short-circuit current caused by ground fault, and can reduce the condition of enlarging fault range during fault.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is the embodiment of the utility model provides a conventional structure schematic diagram that adds auxiliary thermal power generating unit frequency modulation system of reserve hybrid energy storage.
Description of reference numerals: 1-thermal power generation grid-connected unit; 2, starting a standby energy storage unit of the standby transformer; 3-high plant to conventional energy storage unit;
1-a generator; 1-2-main transformer of generator; 1-3-a grid transmission bus;
2-1, starting and preparing a thermal power generating unit; 2-2, starting a low-voltage side A branch bus; 2-3, starting a low-voltage-reducing side B branch bus; 2-4-starting a low-voltage side A branch breaker; 2-5-standby energy storage boosting and changing; 2-6-standby energy storage grid-connected circuit breaker; 2-7, a standby energy storage converter; 2-8-spare energy storage equipment;
3-1-split winding high-rise transformer; branch A for 3-2-6 kV factories; branch B for 3-6 kV factories; a branch circuit breaker A for 3-4-6 kV factories; branch load of A for 3-5-6 kV factories; a 3-6 kV factory B branch circuit breaker; a branch load of B for 3-7-6 kV factories; 3-8-a conventional energy storage PET grid-connected circuit breaker; 3-9-a conventional energy storage PET high-voltage direct-alternating current converter; 3-10-a conventional energy storage PET high-voltage side filter capacitor; 3-11-a conventional energy storage PET high-frequency DC-DC transformer; 3-12-a conventional energy storage PET low-voltage side filter capacitor; 3-13-a conventional energy storage PET low-voltage AC-DC converter; 3-14-conventional energy storage PET low-voltage side circuit breaker; 3-15-conventional energy storage converter; 3-16-conventional energy storage device.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention. On the contrary, the embodiments of the invention include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
The present invention will be described in detail with reference to specific examples.
Fig. 1 is the embodiment of the utility model provides a conventional structure schematic diagram that adds auxiliary thermal power generating unit frequency modulation system of reserve hybrid energy storage.
As shown in fig. 1, the embodiment of the utility model provides a conventional thermal power unit frequency modulation system is assisted with reserve hybrid energy storage that adds includes: the system comprises a thermal power generation grid-connected unit 1, a standby energy storage unit 2 of a starting transformer and a conventional energy storage unit 3 of a high-rise transformer;
the high-voltage side of the thermal power generation grid-connected unit 1 is connected with the high-voltage side of the standby energy storage unit 2 of the starting transformer, and the low-voltage side of the thermal power generation grid-connected unit 1 is connected with the low-voltage side of the standby energy storage unit 2 of the starting transformer and the conventional energy storage unit 3 of the high-voltage power plant transformer.
According to some embodiments, the hybrid energy storage technology is a large-scale energy storage technology as one of the key technical supports of energy revolution, and has recently received much attention in the industry because it can provide a variety of auxiliary services such as peak shaving, frequency modulation, emergency response, etc. for the power grid.
In some embodiments, the embodiment of the utility model provides a start and be equipped with and become reserve energy storage unit 2 and high factory and become conventional energy storage unit 3 can be the hybrid energy storage system who comprises flywheel energy storage + lithium cell, links to each other reserve energy storage equipment 2-8 and conventional energy storage equipment 3-12 with thermal power unit through the transverter respectively, can possess the power bidirectional flow ability. Furthermore, the method has the advantages of rapid power regulation, various application modes and the like.
The embodiment of the utility model provides an in, thermal power generation unit 1 that is incorporated into power networks includes: the system comprises a generator 1-1, a generator main transformer 1-2 and a power grid transmission bus 1-3;
the outlet of the generator 1-1 is connected to the low-voltage side of a generator main transformer 1-2, and the high-voltage side of the generator main transformer 1-2 is connected to a power grid transmission bus 1-3;
the outlet of the generator 1-1 is the low-voltage side of the thermal power generation grid-connected unit 1, and the power grid transmission bus 1-3 is the high-voltage side of the thermal power generation grid-connected unit 1.
In the embodiment of the present invention, the voltage level corresponding to the electric energy output by the generator 1-1 is 20kV.
In the embodiment of the utility model provides an, the voltage class of electric wire netting transmission of electricity generating line 1-3 is 220kV.
According to some embodiments, the generator main transformer 1-2 may step up the electrical energy output by the generator 1-1 from 20kV to 220kV.
The embodiment of the utility model provides an in, it becomes reserve energy storage unit 2 to start to be equipped with includes: the system comprises a thermal power generating unit starting transformer 2-1, a starting transformer low-voltage side A branch bus 2-2, a starting transformer low-voltage side B branch bus 2-3, a starting transformer low-voltage side A branch circuit breaker 2-4, a standby energy storage boosting transformer 2-5, a standby energy storage grid-connected circuit breaker 2-6, a standby energy storage converter 2-7 and standby energy storage equipment 2-8;
the low-voltage side of a starting-standby transformer 2-1 of the thermal power generating unit is connected to a starting-standby transformer low-voltage side A branch bus 2-2 and a starting-standby transformer low-voltage side B branch bus 2-3, the starting-standby transformer low-voltage side A branch bus 2-2 is connected to an outlet of a generator 1-1 through a starting-standby transformer low-voltage side A branch circuit breaker 2-4, the starting-standby transformer low-voltage side B branch bus 2-3 is connected to a standby energy storage boosting transformer 2-5, the standby energy storage boosting transformer 2-5 is connected to the alternating current side of a standby energy storage converter 2-7 through a standby energy storage grid-connected circuit breaker 2-6, and the direct current side of the standby energy storage converter 2-7 is connected to a standby energy storage device 2-8;
the high-voltage side of the thermal power generating unit starting-standby transformer 2-1 is the high-voltage side of the starting-standby transformer standby energy storage unit 2, and the end, connected to the outlet of the generator 1-1, of the starting-standby transformer low-voltage side A branch circuit breaker 2-4 is the low-voltage side of the starting-standby transformer standby energy storage unit 2.
According to some embodiments, when the thermal power plant is in power failure for maintenance, the thermal power plant starting transformer 2-1 can provide plant electric energy for the thermal power plant.
The embodiment of the utility model provides an in, high factory becomes conventional energy storage unit 3 and includes: the system comprises a split winding high-voltage Transformer 3-1, a 6kV factory A branch 3-2, a 6kV factory B branch 3-3, a 6kV factory A branch breaker 3-4, a 6kV factory A branch load 3-5, a 6kV factory B branch breaker 3-6, a 6kV factory B branch load 3-7, a conventional energy storage Power Electronic Transformer (PET) grid-connected breaker 3-8, PET, a conventional energy storage PET low-voltage side breaker 3-14, a conventional energy storage converter 3-15 and conventional energy storage equipment 3-16;
the high-voltage side of the split winding high-voltage substation 3-1 is connected to an outlet of a generator 1-1, the low-voltage side of the split winding high-voltage substation 3-1 is connected to a 6kV factory A branch 3-2 and a 6kV factory B branch 3-3,6kV factory A branch 3-2 through a 6kV factory A branch breaker 3-4 to a 6kV factory A branch load 3-5,6kV factory B branch 3-3 through a 6kV factory B branch breaker 3-6 to a 6kV factory B branch load 3-7, the high-voltage side of the PET is connected to a 6kV factory B branch 3-3 through a conventional energy storage PET grid-connected breaker 3-8, the low-voltage side of the PET is connected to the alternating current side of a conventional energy storage converter 3-15 through a conventional energy storage PET low-voltage side breaker 3-14, and the direct current side of the conventional energy storage converter 3-15 is connected to a conventional energy storage device 3-16.
According to some embodiments, PET refers to a new type of power electronics device with, but not limited to, the function of a traditional line frequency ac transformer, implemented by power electronics technology and high frequency transformers (higher operating frequency relative to line frequency transformers). Compared with the traditional power frequency transformer, the manufacturing cost is lower, and the PET is suitable for enriching the system function and improving the application of the system performance and the like.
According to some embodiments, when the energy storage converters, namely the standby energy storage converters 2 to 7 and the conventional energy storage converters 3 to 15 are controlled, the droop control method can be adopted to realize active and reactive decoupling control.
In an embodiment of the present invention, the PET comprises: 3-9 parts of a conventional energy storage PET high-voltage direct-current converter, 3-10 parts of a conventional energy storage PET high-voltage side filter capacitor, 3-11 parts of a conventional energy storage PET high-frequency direct-current DC-DC transformer, 3-12 parts of a conventional energy storage PET low-voltage side filter capacitor and 3-13 parts of a conventional energy storage PET low-voltage alternating-current direct-current converter;
the high-voltage side of the conventional energy storage PET high-voltage direct-alternating current converter 3-9 is connected to a conventional energy storage PET grid-connected circuit breaker 3-8, the high-voltage side of the conventional energy storage PET high-frequency DC-DC transformer 3-9 is connected to the direct-current side of the conventional energy storage PET high-voltage direct-alternating current converter 3-9 through a conventional energy storage PET high-voltage side filter capacitor 3-10, the direct-current side of the conventional energy storage PET low-voltage alternating-direct current converter 3-13 is connected to the low-voltage side of the conventional energy storage PET high-frequency DC-DC transformer 3-11 through a conventional energy storage PET low-voltage side filter capacitor 3-12, and the alternating-current side of the conventional energy storage PET low-voltage alternating-direct current converter 3-13 is connected to a conventional energy storage PET low-voltage side circuit breaker 3-14.
In the embodiment of the present invention, the PET is composed of Modular Multilevel Converter (MMC) power electronic components.
According to some embodiments, an MMC power electronic component refers to a power electronic component that is made up of a cascade of at least two structurally identical sub-modules. The structure of the sub-module includes, but is not limited to, a half H-bridge type, a full H-bridge type, and a double-clamping type sub-module type.
According to some embodiments, the embodiment of the utility model provides a conventional adds the supplementary thermal power unit frequency modulation system during operation of reserve hybrid energy storage, if the conventional adds the supplementary thermal power unit frequency modulation system of reserve hybrid energy storage and acquires the frequency modulation instruction to thermal power electricity generation unit 1 that is incorporated into the power networks, then the conventional adds the supplementary thermal power unit frequency modulation system of reserve hybrid energy storage and can respond to this frequency modulation instruction, controls high factory and becomes conventional energy storage unit 3 and start reserve energy storage unit 2.
In some embodiments, when the frequency modulation system of the conventional hybrid energy storage-assisted thermal power generating unit with the backup function determines that the power signal corresponding to the frequency modulation instruction is smaller than the first power threshold, the frequency modulation system of the conventional hybrid energy storage-assisted thermal power generating unit with the backup function may control the conventional energy storage unit 3 of the high power plant to release energy to the thermal power generation grid-connected unit 1 or absorb energy released by the thermal power generation grid-connected unit 1 in response to the frequency modulation instruction.
In some embodiments, when the frequency modulation system of the conventional backup hybrid energy storage auxiliary thermal power generating unit determines that the power signal corresponding to the frequency modulation instruction is greater than the second power threshold, the frequency modulation system of the conventional backup hybrid energy storage auxiliary thermal power generating unit may control the high-power-plant-to-conventional energy storage unit 3 and the backup energy storage unit 2 to release energy to the thermal power generation grid-connected unit 1 or absorb energy released by the thermal power generation grid-connected unit 1 in response to the frequency modulation instruction, where the second power threshold is not less than the first power threshold.
According to some embodiments, when the conventional backup hybrid energy storage auxiliary thermal power generating unit frequency modulation system responds to a frequency modulation instruction and controls the high-power-plant-to-conventional energy storage unit 3 and the backup energy storage unit 2 to release energy for the thermal power generation grid-connected unit 1, or absorbs energy released by the thermal power generation grid-connected unit 1, the conventional backup hybrid energy storage auxiliary thermal power generating unit frequency modulation system can control the backup energy storage devices 2-8 to be connected to the thermal power generating unit backup energy storage unit 2-1. Furthermore, the frequency modulation system of the conventional and standby hybrid energy storage auxiliary thermal power generating unit can control the standby energy storage devices 2-8 and the conventional energy storage devices 3-16 to jointly absorb energy or jointly release energy so as to respond to the frequency change corresponding to the frequency modulation instruction.
According to some embodiments, the frequency modulation command refers to a command for instructing the frequency modulation of the thermal power generation grid-connected unit 1. The fm command does not specifically refer to a fixed command. The frequency modulation command includes, but is not limited to, a frequency increase command, a frequency decrease command, and the like.
In some embodiments, the frequency increase instruction is also referred to as a load increase instruction, and refers to an instruction for increasing the frequency of the thermal power generation grid-connected unit 1. If the frequency modulation instruction is a frequency increasing instruction, the conventional backup hybrid energy storage auxiliary thermal power generating unit frequency modulation system can control the backup energy storage devices 2-8 and the conventional energy storage devices 3-16 to release electric energy.
In some embodiments, the frequency reduction command is also called a load reduction command, and refers to a command for instructing to reduce the frequency of the thermal power generation grid-connected unit 1. If the frequency modulation instruction is a frequency reduction instruction, the conventional backup hybrid energy storage auxiliary thermal power generating unit frequency modulation system can control the backup energy storage devices 2-8 and the conventional energy storage devices 3-16 to absorb electric energy.
In some embodiments, when the frequency modulation instruction is a frequency increase instruction, the frequency modulation system of the conventional backup hybrid energy storage auxiliary thermal power generating unit can respond to the frequency increase instruction to control the high-power-plant-to-conventional energy storage unit 3 and/or the backup energy storage unit 2 to release energy to the thermal power generation grid-connected unit 1;
in some embodiments, when the frequency modulation instruction is a frequency drop instruction, the frequency modulation system of the conventional and backup hybrid energy storage auxiliary thermal power generating unit may control the high-power-plant-to-conventional energy storage unit 3 and/or the startup-to-backup energy storage unit 2 to absorb energy released by the thermal power generation grid-connected unit 1 in response to the frequency drop instruction.
To sum up, the embodiment of the utility model provides a technical scheme brings following beneficial effect at least:
1. the utility model discloses an adopt and open reserve energy storage unit 2 and the high factory become the supplementary conventionality of energy storage that conventional energy storage unit 3 constitutes with reserve hybrid energy storage auxiliary thermal power generating unit frequency modulation system, can improve the conventionality and add the response speed of supplementary thermal power generating unit frequency modulation system of reserve hybrid energy storage when carrying out the frequency modulation task, can improve unit climbing speed.
2. The utility model discloses an adopt to start to be equipped with and become reserve energy storage unit 2 and the auxiliary convention of energy storage that conventional energy storage unit 3 constitutes of high factory and add reserve mixed energy auxiliary thermal power unit frequency modulation system, this energy storage auxiliary convention adds reserve mixed energy auxiliary thermal power unit frequency modulation system and can be arranged in supplementary thermal power electricity generation unit 1 of being incorporated into the power grid frequency mediation. Furthermore, the rapid charging/discharging capabilities of the standby energy storage devices 2-8 and the conventional energy storage devices 3-16 can be utilized to respond to the load change of the power grid, and the thermal power generation grid-connected unit 1 can be assisted to perform optimal power matching no matter whether primary frequency modulation, secondary frequency modulation or multi-frequency modulation is performed. Therefore, the frequency modulation benefit of the thermal power plant can be improved, the output fluctuation of the generator 1-1 can be reduced, the safety of the thermal power unit can be improved, and the aging of the thermal power unit equipment caused by frequent load adjustment can be reduced. The number of times of power conversion operation can be reduced; furthermore, the fatigue degree and the abrasion degree of the thermal power unit equipment can be reduced, and the service life of the thermal power unit equipment can be prolonged.
3. The standby energy storage equipment 2-8 is connected to the starting transformer 2-1 of the thermal power generating unit through a standby energy storage converter 2-7, a standby energy storage grid-connected breaker 2-6, a standby energy storage boosting transformer 2-5 and a starting transformer low-voltage side B branch bus 2-3, the conventional energy storage equipment 3-16 is connected to the split winding high-voltage substation 3-1 through a conventional energy storage converter 3-15, a conventional energy storage PET low-voltage side breaker 3-14, PET, a conventional energy storage PET grid-connected breaker 3-8 and a 6kV plant B branch 3-3, and the standby energy storage equipment 2-8 and the conventional energy storage equipment 3-16 are respectively connected with different transformers. Therefore, the load rate of the split winding high-plant transformer 3-1 can be reduced, the split winding high-plant transformer 3-1 can be ensured to operate with a certain margin, the load of the transformer can be effectively reduced, and the capacities of the split winding high-plant transformer 3-1 and the thermal power unit equipment transformer 2-1 do not need to be increased.
4. The utility model discloses an adopt PET, can improve the factory and become conventional energy storage power supply efficiency of conventional energy storage unit 3, can practice thrift the energy storage system construction cost that high factory becomes conventional energy storage unit 3. And, the utility model discloses an adopt PET, in response unit frequency control, can improve the speed and the accuracy of power change.
5. The utility model discloses a PET adopt high frequency electromagnetic coupling technique, compare in traditional power frequency transformer, on the basis of the functions such as voltage level transform, isolation that realize traditional transformer, can also vary voltage in a flexible way, can effectively reduce transformer area and volume.
6. The utility model discloses a PET constitute by MMC power electronic components, MMC power electronic components output harmonic low, electric energy conversion efficiency high, have higher expansibility. The voltage conversion of the MMC power electronic component is controllable, short-circuit current caused by ground fault can be effectively restrained, and the condition of enlarging fault range during fault can be reduced.
7. The utility model discloses a control high factory becomes conventional energy storage unit and starts to become reserve energy storage unit and carry out the corresponding action of power signal that corresponds with the frequency modulation instruction, can accurately trail electric wire netting scheduling instruction, can reduce and adjust delay time, reduce the regulation deviation, reduce and adjust phenomenons such as reverse.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms may be directed to different embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. 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.
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 such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. The utility model provides a conventional adds supplementary thermal power generating set frequency modulation system of reserve hybrid energy storage which characterized in that includes: the system comprises a thermal power generation grid-connected unit, a standby energy storage unit of a starting transformer and a conventional energy storage unit of a high-rise transformer;
the high-voltage side of the thermal power generation grid-connected unit is connected to the high-voltage side of the standby energy storage unit of the starting transformer, and the low-voltage side of the thermal power generation grid-connected unit is connected to the low-voltage side of the standby energy storage unit of the starting transformer and the conventional energy storage unit of the high-voltage power plant transformer.
2. The frequency modulation system of the conventional backup hybrid energy storage auxiliary thermal power generating unit according to claim 1, wherein the thermal power generation grid-connected unit comprises: the system comprises a generator, a generator main transformer and a power grid transmission bus;
wherein an outlet of the generator is connected to a low-voltage side of the generator main transformer, and a high-voltage side of the generator main transformer is connected to the grid transmission bus;
the outlet of the generator is the low-voltage side of the thermal power generation grid-connected unit, and the power grid transmission bus is the high-voltage side of the thermal power generation grid-connected unit.
3. The frequency modulation system of the conventional backup hybrid energy storage auxiliary thermal power generating unit according to claim 2, wherein the voltage level corresponding to the electric energy output by the generator is 20kV.
4. The frequency modulation system of the conventional backup hybrid energy storage auxiliary thermal power generating unit according to claim 2, wherein the voltage level of the power grid transmission bus is 220kV.
5. The system for modulating frequency of a conventional and backup hybrid energy storage auxiliary thermal power generating unit according to claim 2, wherein the backup energy storage unit of the startup converter comprises: the system comprises a thermal power generating unit starting transformer, a starting low-voltage side A branch bus, a starting low-voltage side B branch bus, a starting low-voltage side A branch circuit breaker, a standby energy storage boosting transformer, a standby energy storage grid-connected circuit breaker, a standby energy storage converter and standby energy storage equipment;
wherein the low-voltage side of the thermal power generating unit starting transformer is connected to the starting transformer low-voltage side A branch bus and the starting transformer low-voltage side B branch bus, the starting transformer low-voltage side A branch bus is connected to the outlet of the generator through the starting transformer low-voltage side A branch breaker, the starting transformer low-voltage side B branch bus is connected to the standby energy storage step-up transformer, the standby energy storage step-up transformer is connected to the alternating current side of the standby energy storage converter through the standby energy storage grid-connected breaker, and the direct current side of the standby energy storage converter is connected to the standby energy storage equipment;
the high-voltage side that thermal power unit started to be equipped with becomes the high-voltage side that starts to be equipped with and becomes reserve energy storage unit, it is connected to start to be equipped with the one end that becomes the export of low-voltage side A branch circuit breaker be the low pressure side that starts to be equipped with and becomes reserve energy storage unit.
6. A conventional-plus-backup hybrid energy-storage-assisted thermal power generating unit frequency modulation system as claimed in claim 2, wherein the high plant-to-conventional energy storage unit comprises: the method comprises the following steps of (1) splitting a winding high-voltage transformer, a 6kV factory A branch, a 6kV factory B branch, a 6kV factory A branch breaker, a 6kV factory A branch load, a 6kV factory B branch breaker, a 6kV factory B branch load, a conventional energy storage PET grid-connected breaker, PET, a conventional energy storage PET low-voltage side breaker, a conventional energy storage current converter and conventional energy storage equipment;
wherein, the high pressure side that the high factory of split winding becomes is connected to the export of generator, the low pressure side that the high factory of split winding becomes is connected to 6kV factory with A branch with 6kV factory with B branch, 6kV factory with A branch passes through 6kV factory with A branch circuit breaker is connected to 6kV factory with A branch load, 6kV factory with B branch passes through 6kV factory with B branch circuit breaker is connected to 6kV factory with B branch load, PET's high-pressure side passes through conventional energy storage PET is incorporated into the power networks the circuit breaker and is connected to 6kV factory with B branch, PET's low pressure side passes through conventional energy storage PET low pressure side circuit breaker is connected to conventional energy storage transverter's alternating current side, conventional energy storage transverter's direct current side is connected to conventional energy storage equipment.
7. The frequency modulation system of a conventional backup hybrid energy storage thermal power generating unit as claimed in claim 6, wherein the PET comprises: the system comprises a conventional energy storage PET high-voltage direct-current converter, a conventional energy storage PET high-voltage side filter capacitor, a conventional energy storage PET high-frequency DC-DC transformer, a conventional energy storage PET low-voltage side filter capacitor and a conventional energy storage PET low-voltage alternating-current direct-current converter;
wherein the alternating current side of the conventional energy storage PET high-voltage DC-DC converter is connected to the conventional energy storage PET grid-connected breaker, the high-voltage side of the conventional energy storage PET high-frequency DC-DC transformer is connected to the direct current side of the conventional energy storage PET high-voltage DC-DC converter through the conventional energy storage PET high-voltage side filter capacitor, the direct current side of the conventional energy storage PET low-voltage AC-DC converter is connected to the low-voltage side of the conventional energy storage PET high-frequency DC-DC converter through the conventional energy storage PET low-voltage side filter capacitor, and the alternating current side of the conventional energy storage PET low-voltage AC-DC converter is connected to the conventional energy storage PET low-voltage side breaker.
8. The system for modulating frequency of a conventional-plus-standby hybrid energy-storage-assisted thermal power generating unit according to claim 6, wherein the PET is composed of modular multilevel converter MMC power electronic components.
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| CN202221657709.5U CN218102597U (en) | 2022-06-29 | 2022-06-29 | Frequency modulation system of conventional and standby hybrid energy storage auxiliary thermal power generating unit |
| PCT/CN2023/098355 WO2024001681A1 (en) | 2022-06-29 | 2023-06-05 | Hybrid energy storage assisted thermal power frequency modulation system |
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| CN202221657709.5U CN218102597U (en) | 2022-06-29 | 2022-06-29 | Frequency modulation system of conventional and standby hybrid energy storage auxiliary thermal power generating unit |
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| WO2024001681A1 (en) * | 2022-06-29 | 2024-01-04 | 华能罗源发电有限责任公司 | Hybrid energy storage assisted thermal power frequency modulation system |
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| EP4344044A3 (en) * | 2019-08-28 | 2024-05-29 | Huawei Digital Power Technologies Co., Ltd. | Inverter of grid-connected photovoltaic power generation system, startup apparatus, method, and system |
| CN110797894A (en) * | 2019-11-07 | 2020-02-14 | 上海豫源电力科技有限公司 | System for performing thermal power frequency modulation by combining super capacitor with lithium battery energy storage |
| CN111725828A (en) * | 2020-07-24 | 2020-09-29 | 西安热工研究院有限公司 | Energy storage device with controllable load participates in primary frequency modulation system of thermal power generating unit |
| CN215419599U (en) * | 2021-08-19 | 2022-01-04 | 西安热工研究院有限公司 | Black start system of new energy combined thermal generator set |
| CN216851318U (en) * | 2022-02-17 | 2022-06-28 | 华能洋浦热电有限公司 | Electrochemical energy storage thermal power frequency modulation system |
| CN216851315U (en) * | 2022-02-17 | 2022-06-28 | 华能洋浦热电有限公司 | Boosting combined thermal power system |
| CN218102597U (en) * | 2022-06-29 | 2022-12-20 | 西安热工研究院有限公司 | Frequency modulation system of conventional and standby hybrid energy storage auxiliary thermal power generating unit |
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| WO2024001681A1 (en) * | 2022-06-29 | 2024-01-04 | 华能罗源发电有限责任公司 | Hybrid energy storage assisted thermal power frequency modulation system |
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