CN218514098U - Energy storage system for thermal power plant - Google Patents
Energy storage system for thermal power plant Download PDFInfo
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- CN218514098U CN218514098U CN202221657030.6U CN202221657030U CN218514098U CN 218514098 U CN218514098 U CN 218514098U CN 202221657030 U CN202221657030 U CN 202221657030U CN 218514098 U CN218514098 U CN 218514098U
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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
- H02J15/00—Systems for storing electric energy
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The utility model provides an energy storage system is used in thermal power plant, the system includes: a factory 6.3KV alternating current unit and a medium-voltage direct current energy storage unit; and the plant 6.3KV alternating current unit is connected with the medium-voltage direct current energy storage unit. The technical scheme who this application provided utilizes energy storage battery to participate in unit response AGC frequency modulation, just the thermal power plant still has the plant and uses frequency conversion feed pump and the large-scale fan of frequency conversion with middling pressure direct current energy storage system, need not the rectification drive link among the frequency conversion equipment, has simplified frequency conversion equipment, has improved the frequency modulation ability and the flexibility of power exchange of thermal power plant with middling pressure direct current energy storage system, and then has reduced the energy consumption, has improved the power supply stability of thermal power plant with middling pressure direct current energy storage system simultaneously.
Description
Technical Field
The utility model relates to an energy storage technical field especially relates to an energy storage system is used in thermal power plant.
Background
The typical design of the factory power system of a large-scale thermal power generating unit at present is that a high-voltage bus system for a factory is arranged by tapping a generator outlet, factory power above 200kW is led from a factory high-voltage bus, a water feeding pump with the largest power load is generally provided with a steam-driven pump for rotating speed adjustment in order to reduce the factory power consumption, the large-scale fan considers investment and generally selects a movable blade adjustable mode for load adjustment in an energy-saving and economical mode, and the load adjustment of low-voltage power generally selects variable frequency adjustment. The energy storage system has the advantages of high response speed, strong short-time power throughput capacity and flexible adjustment, can realize full power output within milliseconds to seconds, and can be accurately controlled within rated power. Relevant researches show that the frequency modulation efficiency of an energy storage system with the continuous charging/discharging time of 15min is 1.4 times that of a hydroelectric generating set, 2.2 times that of a gas generating set and 24 times that of a coal generating set. However, the power exchange of the thermal power plant system combining the conventional energy storage system and the conventional thermal power supply is not flexible and the frequency modulation capability is low, so that the energy consumption is large and the power supply stability is poor.
Disclosure of Invention
The utility model provides an energy storage system is used in thermal power plant to solve the great and poor technical problem of power supply stability of energy consumption in the correlation technique at least.
An embodiment of a first aspect of the present application provides an energy storage system for a thermal power plant, the system includes:
a factory 6.3KV alternating current unit and a medium-voltage direct current energy storage unit;
and the plant 6.3KV alternating current unit is connected with the medium-voltage direct current energy storage unit.
The technical scheme provided by the embodiment of the application at least has the following beneficial effects:
the utility model provides an energy storage system is used in thermal power plant, the system includes: a factory 6.3KV alternating current unit and a medium-voltage direct current energy storage unit; and the plant 6.3KV alternating current unit is connected with the medium-voltage direct current energy storage unit. The technical scheme that this application provided utilizes energy storage battery to participate in unit response Automatic Generation Control (AGC) frequency modulation, just the thermal power plant still has the plant and uses frequency conversion water-feeding pump and the large-scale fan of frequency conversion with middling pressure direct current energy storage system, need not the rectification drive link among the frequency conversion device, has simplified frequency conversion equipment, has improved the frequency modulation ability and the flexibility of power exchange of thermal power plant with middling pressure direct current energy storage system, and then has reduced the energy consumption, has improved the power stability of supplying power of thermal power plant with middling pressure direct current energy storage system simultaneously.
Additional aspects and advantages of the present application 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 present application.
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 a schematic structural diagram of an energy storage system for a thermal power plant according to an embodiment of the present invention;
description of reference numerals:
the system comprises a plant 6.3KV alternating current unit 1, a medium-voltage direct current energy storage unit 2, a 20 kV-to-6.3 kV split winding transformer 1-1, a first bus 1-2 for a 6.3KV alternating current plant, a second bus 1-3 for the 6.3KV alternating current plant, a double-winding transformer 1-4, a bidirectional PCS converter 1-5, a plant alternating current-direct current interconnection switch 1-6, an alternating current load switch 1-7, a plant alternating current load 1-8, a medium-voltage direct current bus 2-1, an energy storage direct current DC-DC converter 2-2, an energy storage battery 2-3, an energy storage battery grid-connected breaker 2-4, a variable-frequency inversion driver 2-5, a grid-connected switch 2-6, a water feeding pump and variable-frequency large-scale fan 2-7, a direct current load 2-8 and a direct current load breaker 2-9.
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 drawings are exemplary only for the purpose of 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 a schematic structural diagram of an energy storage system for a thermal power plant provided by an embodiment of the present invention.
As shown in FIG. 1, an embodiment of the utility model provides a pair of energy storage system for thermal power plant, include: a factory 6.3KV alternating current unit 1 and a medium-voltage direct current energy storage unit 2;
and the plant 6.3KV alternating current unit 1 is connected with the medium-voltage direct current energy storage unit 2.
It should be noted that the plant 6.3KV alternating current unit 1 and the medium voltage direct current energy storage unit 2 are connected to each other to perform power transmission.
In the embodiment of the present invention, the factory uses 6.3KV ac unit 1, include: the power supply comprises a 20 kV-to-6.3 kV split winding transformer 1-1, a 6.3kV AC plant first bus 1-2, a 6.3kV AC plant second bus 1-3, a double winding transformer 1-4 and a bidirectional PCS converter 1-5;
the high-voltage side of the 20 kV-to-6.3 kV split winding transformer 1-1 is connected with a 20kV generator, and the low-voltage side of the 20 kV-to-6.3 kV split winding transformer 1-1 is respectively connected with a first bus 1-2 for a 6.3kV alternating current plant and a second bus 1-3 for the 6.3kV alternating current plant;
and the double-winding transformer 1-4 is connected with the bidirectional PCS current converter 1-5.
It should be noted that, the factory-used 6.3KV alternating current unit 1 further includes: the plant AC-DC interconnection switch 1-6;
one end of the factory AC-DC interconnection switch 1-6 is connected with the double-winding transformer 1-4, and the other end of the factory AC-DC interconnection switch 1-6 is connected with the first bus of the 6.3KV AC factory 1-2.
In the embodiment of the present invention, the factory 6.3KV ac unit 1 further includes: alternating current load switches 1-7 and house-service alternating current loads 1-8;
and the plant alternating current load is connected with the 6.3KV alternating current plant first bus through the alternating current load switch.
For example, taking a first bus connection 1-2 for a 6.3KV ac power plant as an example, the ac load 1-8 for the plant is connected to the first bus for the 6.3KV ac power plant through the ac load switch 1-7, the high-voltage side of the dual-winding transformer 1-4 is connected to the first bus connection 1-2 for the 6.3KV ac power plant through the ac-dc interconnection switch 1-6 for the plant, and the low-voltage side of the dual-winding transformer 1-4 is connected to the medium-voltage dc energy storage unit 2 through the bidirectional PCS converter 1-5. Compared with the case that a circuit breaker is added to the direct-current side of the bidirectional PCS converter 1-5, the factory alternating-current-direct-current interconnection switch 1-6 reduces investment, and the power exchange between the factory 6.3KV alternating-current unit 1 and the medium-voltage direct-current energy storage unit 2 is more flexible.
In an embodiment of the present invention, the medium voltage dc energy storage unit 2 includes: the system comprises a medium-voltage direct-current bus 2-1, an energy storage direct-current DC-DC converter 2-2 and an energy storage battery 2-3;
the energy storage battery 2-3 is connected with the medium-voltage direct-current bus 2-1 through the energy storage direct-current DC-DC converter 2-2.
Further, the bidirectional PCS converter 1-5 is connected with the medium-voltage direct-current bus 2-1.
It should be noted that the medium-voltage dc energy storage unit 2 further includes: the energy storage battery is connected to the grid circuit breaker 2-4;
one end of the energy storage battery grid-connected circuit breaker 2-4 is connected with the energy storage direct current DC-DC converter 2-2, and the other end of the energy storage battery grid-connected circuit breaker 2-4 is connected with the medium-voltage direct current bus 2-1.
In an embodiment of the present invention, the medium voltage dc energy storage unit 2 further includes: 2-5 of a variable frequency inversion driver, 2-6 of a grid-connected switch, 2-7 of a water feeding pump and a variable frequency large fan;
the water supply pump and the frequency conversion large-scale fan 2-7 are connected with one end of the frequency conversion inverter driver 2-5 through the grid-connected switch 2-6;
the other end of the variable-frequency inverter driver 2-5 is connected with the medium-voltage direct-current bus 2-1.
Illustratively, the energy storage battery 2-3 is connected with the medium-voltage direct-current bus 2-1 through the energy storage direct-current DC-DC converter 2-2 and the energy storage battery grid-connected breaker 2-4, the energy storage DC-DC converter 2-3 has a step-up/step-down function, and can realize a 220V-6kV direct-current voltage change, when the energy storage battery 2-3 is charged, the energy storage DC-DC converter 2-3 operates in a boost state, when the energy storage battery 2-3 is discharged, the energy storage direct-current DC-DC converter 2-2 operates in a buck state, the water supply pump and the large variable-frequency fan 2-7 are connected with the medium-voltage direct-current bus 2-1 through the grid-connected switch 2-6 and the variable-frequency inverter driver 2-5, compared with a traditional frequency converter, a rectification drive link is omitted, frequency conversion equipment is simplified, power supply reliability of the medium-voltage direct-current energy storage system for the thermal power plant is improved, full-frequency conversion of important high-voltage power is realized, and energy consumption level of the whole plant is remarkably reduced.
In the embodiment of the present invention, the medium voltage dc energy storage unit 2 further includes: 2-8 of direct current load;
the direct current load 2-8 is connected with the medium voltage direct current bus 2-1.
It should be noted that the medium-voltage dc energy storage unit 2 further includes: DC load circuit breakers 2-9;
one end of the direct current load breaker 2-9 is connected with the direct current load 2-8, and the other end of the direct current load breaker 2-9 is connected with the medium-voltage direct current bus 2-1.
The bidirectional PCS converter 1-5 can realize bidirectional power transmission and respond to frequency reduction-load increase and frequency increase-load reduction instructions. When the thermal power generating unit receives an AGC frequency increasing instruction of a descending load of a power grid, the plant 6.3KV alternating current unit 1 charges the energy storage battery 2-3 through the bidirectional PCS converter 1-5 and the energy storage direct current DC-DC converter 2-2, the bidirectional PCS converter 1-5 works in a rectification state, and the energy storage direct current DC-DC converter 2-2 works in a boost state. When the thermal power generating unit receives an AGC frequency descending instruction of ascending load of a power grid, the energy storage battery 2-3 transmits electric energy to the plant 6.3KV alternating current unit 1 through the bidirectional PCS current converter 1-5 and the energy storage direct current DC-DC current converter 2-2, the bidirectional PCS current converter 1-5 works in an inversion state, and the energy storage direct current DC-DC current converter 2-2 works in a buck state.
It should be noted that the present invention provides a bidirectional energy storage System (PCS) converter 1-5 capable of realizing bidirectional Power transmission, responding to frequency down-up and frequency up-down commands. When the thermal power generating unit receives an AGC frequency increasing instruction of a descending load of a power grid, the plant 6.3KV alternating current unit 1 charges the energy storage battery 2-3 through the bidirectional PCS converter 1-5 and the energy storage direct current DC-DC converter 2-2, the bidirectional PCS converter 1-5 works in a rectification state, and the energy storage DC-DC converter 2-3 works in a boost state. When the thermal power generating unit receives an AGC frequency descending instruction of a power grid ascending load, the energy storage battery 2-3 transmits electric energy to the plant 6.3KV alternating current unit 1 through the bidirectional PCS converter 1-5 and the energy storage DC-DC converter 2-3, the bidirectional PCS converter 1-5 works in an inversion state, and the energy storage DC-DC converter 2-3 works in a buck state.
To sum up, the utility model provides a pair of energy storage system is used in thermal power plant, the system includes: a factory 6.3KV alternating current unit and a medium-voltage direct current energy storage unit; and the plant 6.3KV alternating current unit is connected with the medium-voltage direct current energy storage unit. The technical scheme who this application provided utilizes electrochemistry energy storage battery to participate in unit response AGC frequency modulation, just the medium voltage direct current energy storage system for the thermal power plant still has the station-oriented frequency conversion water-feeding pump and the large-scale fan of frequency conversion, need not the rectification drive link among the frequency conversion equipment, has simplified frequency conversion equipment, has improved the frequency modulation ability and the flexibility of power exchange of medium voltage direct current energy storage system for the thermal power plant, and then has reduced the energy consumption, has improved the power supply stability of medium voltage direct current energy storage system for the thermal power plant simultaneously.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (1)
1. An energy storage system for a thermal power plant, comprising: a factory 6.3KV alternating current unit and a medium-voltage direct current energy storage unit;
the plant 6.3KV alternating current unit is connected with the medium-voltage direct current energy storage unit;
the factory-used 6.3KV alternating current unit comprises: the system comprises a 20 kV-to-6.3 kV split winding transformer, a first bus for 6.3kV alternating current plants, a second bus for 6.3kV alternating current plants, a double-winding transformer and a bidirectional PCS converter;
the high-voltage side of the 20 kV-to-6.3 kV split winding transformer is connected with a 20kV generator, and the low-voltage side of the 20 kV-to-6.3 kV split winding transformer is respectively connected with the first bus for 6.3kV alternating current plants and the second bus for 6.3kV alternating current plants;
the double-winding transformer is connected with the bidirectional PCS converter;
the plant 6.3KV alternating current unit further comprises: a service AC-DC interconnection switch;
one end of the plant AC-DC interconnection switch is connected with the double-winding transformer, and the other end of the plant AC-DC interconnection switch is connected with the 6.3KV AC plant first bus;
the plant 6.3KV alternating current unit further comprises: an alternating current load switch and a factory alternating current load;
the factory alternating current load is connected with the 6.3KV alternating current factory-used first bus through the alternating current load switch;
the medium voltage direct current energy storage unit comprises: the system comprises a medium-voltage direct-current bus, an energy storage direct-current DC-DC converter and an energy storage battery;
the energy storage battery is connected with the medium-voltage direct-current bus through the energy storage direct-current DC-DC converter;
the medium-voltage direct-current energy storage unit further comprises: an energy storage battery grid-connected breaker;
one end of the energy storage battery grid-connected circuit breaker is connected with the energy storage direct current DC-DC converter, and the other end of the energy storage battery grid-connected circuit breaker is connected with the medium-voltage direct current bus;
the medium-voltage direct-current energy storage unit further comprises: the system comprises a variable-frequency inversion driver, a grid-connected switch, a water feeding pump and a variable-frequency large fan;
the water feeding pump and the frequency conversion large fan are connected with one end of the frequency conversion inversion driver through the grid-connected switch;
the other end of the variable-frequency inverter driver is connected with the medium-voltage direct-current bus;
the medium-voltage direct-current energy storage unit further comprises: a direct current load;
the direct current load is connected with the medium-voltage direct current bus;
the medium-voltage direct-current energy storage unit further comprises: a direct current load circuit breaker;
one end of the direct current load circuit breaker is connected with the direct current load, and the other end of the direct current load circuit breaker is connected with the medium-voltage direct current bus;
the bidirectional PCS converter is connected with the medium-voltage direct-current bus.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221657030.6U CN218514098U (en) | 2022-06-29 | 2022-06-29 | Energy storage system for thermal power plant |
| DE202023103608.2U DE202023103608U1 (en) | 2022-06-29 | 2023-06-29 | Energy storage system for thermal power plants |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221657030.6U CN218514098U (en) | 2022-06-29 | 2022-06-29 | Energy storage system for thermal power plant |
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| Publication Number | Publication Date |
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| CN218514098U true CN218514098U (en) | 2023-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221657030.6U Active CN218514098U (en) | 2022-06-29 | 2022-06-29 | Energy storage system for thermal power plant |
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| CN (1) | CN218514098U (en) |
| DE (1) | DE202023103608U1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117154789A (en) * | 2023-08-22 | 2023-12-01 | 华能罗源发电有限责任公司 | Medium-voltage direct-current energy storage system for thermal power plant |
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2022
- 2022-06-29 CN CN202221657030.6U patent/CN218514098U/en active Active
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2023
- 2023-06-29 DE DE202023103608.2U patent/DE202023103608U1/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117154789A (en) * | 2023-08-22 | 2023-12-01 | 华能罗源发电有限责任公司 | Medium-voltage direct-current energy storage system for thermal power plant |
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| Publication number | Publication date |
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| DE202023103608U1 (en) | 2023-07-18 |
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