CN114243739A - Energy storage centralized converter system for thermal power plant - Google Patents
Energy storage centralized converter system for thermal power plant Download PDFInfo
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- CN114243739A CN114243739A CN202111556252.9A CN202111556252A CN114243739A CN 114243739 A CN114243739 A CN 114243739A CN 202111556252 A CN202111556252 A CN 202111556252A CN 114243739 A CN114243739 A CN 114243739A
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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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Abstract
The invention discloses an energy storage centralized converter system for a thermal power plant, which comprises: the system comprises a power supply unit, an energy storage centralized current conversion transformation unit and an energy storage device unit for the thermal power plant; the energy storage device unit is divided into A, B units, and is connected to energy storage A, B section in the energy storage centralized current conversion transformation unit through the direct current breaker respectively, and energy storage A, B section is connected to 6kV/400V step-down transformer of station service A, B section in the power supply unit for the thermal power plant through the centralized current conversion device respectively, realizes that energy storage unit and thermal power plant station service electricity energy exchange, makes the energy storage participate in the thermal power plant adjustment process. The invention overcomes the defects of complex control and high failure rate of a single energy storage commutation device by the centralized commutation of the energy storage units. And a centralized commutation PCS device is adopted to realize high-power energy exchange between the energy storage unit and the thermal power generating unit.
Description
Technical Field
The invention relates to an energy storage centralized commutation system for a thermal power plant, which overcomes the defects of complex control and high failure rate of a single energy storage commutation device through centralized commutation of an energy storage unit. And a centralized commutation PCS device is adopted to realize high-power energy exchange between the energy storage unit and the thermal power generating unit.
Background
In recent years, with the development of the energy storage industry, various novel energy storage technologies are broken through continuously, and demonstration applications are realized in more and more scenes, wherein the novel energy storage technologies mainly include a heat storage technology, a hydrogen energy storage technology, an electromagnetic energy storage technology, a flywheel energy storage technology and the like. With the increase of the grid-connected quantity of wind power and photovoltaic power, the rapid development of interconnected large power grids, large-capacity power generation and long-distance power transmission, the adjustment task of a power system is heavier. The energy storage unit is used as a power supply capable of being charged and discharged flexibly, can realize dynamic energy absorption and release in a power grid, and has the advantages of replacement or not in maintaining the voltage stability of the power grid due to quick response and flexible control.
At present, in the field of thermal power energy storage, most of single energy storage units are configured with single PCS devices, so that the equipment failure rate is undoubtedly increased, and when an energy storage system is matched with a thermal power generating unit for adjustment, the power adjustment range is WM (pulse width modulation) level, and the control to kW level is not required, so that the single energy storage unit is configured with a single PCS device mode, and the method is not suitable for the field of thermal power energy storage.
Disclosure of Invention
The invention aims to provide an energy storage centralized commutation system for a thermal power plant, which overcomes the defects of complex control and high failure rate of a single energy storage commutation device through centralized commutation of an energy storage unit. And a centralized commutation PCS device is adopted to realize high-power energy exchange between the energy storage unit and the thermal power generating unit.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
an energy storage centralized converter system for a thermal power plant comprises: the system comprises a power supply unit, an energy storage centralized current conversion transformation unit and an energy storage device unit for the thermal power plant;
the energy storage device unit is divided into A, B units, and is connected to energy storage A, B section in the energy storage centralized current conversion transformation unit through the direct current breaker respectively, and energy storage A, B section is connected to 6kV/400V step-down transformer of station service A, B section in the power supply unit for the thermal power plant through the centralized current conversion device respectively, realizes that energy storage unit and thermal power plant station service electricity energy exchange, makes the energy storage participate in the thermal power plant adjustment process.
In a further development of the invention, the service ac 6.3kV unit comprises: the system comprises a thermal power generator, a thermal power plant split winding transformer, a 6.3kV plant power A section, a plant load grid-connected switch of an A section, a plant load of an A section, a 6.3kV plant power B section, a plant load grid-connected switch of a B section and a plant load of a B section;
the outlet of the thermal power generator is connected with the high-voltage side of the thermal power plant split winding transformer, the section A of the 6.3kV plant power is connected to the branch A of the low-voltage side of the thermal power plant split winding transformer, and the section A of plant power load is connected to the section A of the 6.3kV plant power through the section A of plant power load grid-connected switch; the B section of the 6.3kV station service power is connected to a B branch of a low-voltage side of a split winding transformer for the thermal power plant station service, and the B section of the station service load is connected to the B section of the 6.3kV station service power through a B section of station service load grid-connected switch.
The invention has the further improvement that the energy storage centralized conversion voltage transformation unit comprises: the energy storage grid-connected switch comprises an A section energy storage grid-connected switch, an A section energy storage 6kV/400V step-down transformer, an A section energy storage centralized converter device, a B section energy storage grid-connected switch, a B section energy storage 6kV/400V step-down transformer and a B section energy storage centralized converter device;
the A section energy storage 6kV/400V step-down transformer high-voltage side is connected to the 6.3kV station service A section through the A section energy storage grid-connected switch, and the A section energy storage centralized converter device alternating current side is connected to the A section energy storage 6kV/400V step-down transformer low-voltage side; the B section energy storage 6kV/400V step-down transformer high-voltage side is connected to the 6.3kV station service B section through the B section energy storage grid-connected switch, and the B section energy storage centralized converter alternating current side is connected to the B section energy storage 6kV/400V step-down transformer low-voltage side.
The invention has the further improvement that the A-section energy storage centralized converter device and the B-section energy storage centralized converter device can realize high-power energy exchange between the energy storage unit and the thermal power unit and cooperate with the thermal power unit to carry out WM-level power regulation.
The invention has the further improvement that the A-section energy storage centralized converter device and the B-section energy storage centralized converter device adopt high-power high-frequency IGBT components, and the maximum short-circuit current provided by the energy storage system is not more than 1.5 times of the rated current.
A further development of the invention is that the energy storage unit comprises: the energy storage system comprises an A-section energy storage direct current breaker, an A-section energy storage device, a B-section energy storage direct current breaker and a B-section energy storage device;
the section A energy storage equipment is connected to the DC side of the section A energy storage centralized converter device through the section A energy storage DC circuit breaker, and the section B energy storage equipment is connected to the DC side of the section B energy storage centralized converter device through the section B energy storage DC circuit breaker.
The invention has the further improvement that the energy storage equipment of the section A and the energy storage equipment of the section B realize the power centralized exchange through the energy storage centralized converter device of the section A and the energy storage centralized converter device of the section B.
The further improvement of the invention is that the energy storage unit is regarded as a service load, and the switching of the energy storage unit is realized by switching on and off the A-section energy storage grid-connected switch and the B-section energy storage grid-connected switch.
Compared with the prior art, the invention has at least the following beneficial technical effects:
1. the centralized converter device overcomes the defects of complex control and high failure rate of a single energy storage converter device, realizes high-power energy exchange between the energy storage unit and the thermal power generating unit, can be matched with the thermal power generating unit to carry out WM-level power regulation, and is suitable for the field of thermal power energy storage.
2. The invention adopts the concentrated converter device and high-power high-frequency IGBT components, the maximum short-circuit current which can be provided by the energy storage system does not exceed 1.5 times of the rated current, and the protection system for the original thermal power plant cannot be influenced.
3. According to the invention, the energy storage unit is connected with the thermal power plant at 6.3kV through the direct current circuit breaker, the centralized converter device, the 6kV/400V voltage reduction and energy storage grid-connected switch, so that energy exchange between the energy storage unit and the thermal power plant is realized, the energy storage device is connected to the thermal power plant section, engineering change is small, the energy storage unit can be regarded as plant load, and switching of the energy storage unit is realized by switching off the energy storage grid-connected switch.
Drawings
Fig. 1 is a schematic structural diagram of an energy storage centralized converter system for a thermal power plant according to the present invention.
Description of reference numerals:
1-factory alternating current 6.3kV unit; 2, energy storage centralized current conversion and voltage transformation unit; 3-an energy storage device unit;
1-a thermal power generator; 1-2-a split winding transformer for thermal power plant; 1-3-6.3 kV station service power A section; 1-4-A section of factory load grid-connected switch; 1-5-A section of factory load; 1-6-6.3 kV station service power B section; 1-7-B section factory load grid-connected switch; 1-8-B section of factory load;
2-1-A section of energy storage grid-connected switch; 2-A section energy storage 6kV/400V voltage reduction transformer; 2-3-A section of energy storage centralized converter device; 2-4-B section energy storage grid-connected switch; 2-5-B section energy storage 6kV/400V voltage reduction transformer; 2-6-B section energy storage centralized converter;
3-1-A section energy storage direct current breaker; 3-2-a section of energy storage equipment; 3-B section energy storage direct current breaker; and 3-4-B section energy storage equipment.
Detailed Description
The technical solution of the present invention is further described in detail by the accompanying drawings.
As shown in fig. 1, the energy storage centralized converter system for a thermal power plant provided by the present invention includes: the system comprises a power supply unit 1 for the thermal power plant, an energy storage centralized current conversion transformation unit 2 and an energy storage device unit 3; the energy storage device unit 3 is divided into A, B units and is connected to an energy storage A, B section in the energy storage centralized converter transformer unit 2 through a direct current breaker, and an energy storage A, B section is connected to a 6kV/400V step-down transformer of a station A, B section in the power supply unit 1 for the thermal power plant through a centralized converter device, so that the exchange of station power energy of the energy storage unit and the thermal power plant is realized, and the energy storage participates in the adjustment process of the thermal power plant.
The factory alternating current 6.3kV unit 1 comprises: the system comprises a thermal power generator 1-1, a thermal power unit plant split winding transformer 1-2, a 6.3kV plant power A section 1-3, a plant load grid-connected switch 1-4 of the A section, a plant load 1-5 of the A section, a 6.3kV plant power B section 1-6, a plant load grid-connected switch 1-7 of the B section and a plant load 1-8 of the B section. The thermal power generator 1-1 is connected with the high-voltage side of the thermal power plant split winding transformer 1-2 through an outlet, the 6.3kV plant power A section 1-3 is connected to the low-voltage side A branch of the thermal power plant split winding transformer 1-2, and the A section plant load 1-5 is connected to the 6.3kV plant power A section 1-3 through the A section plant load grid-connected switch 1-4. The B section 1-6 of the 6.3kV station power is connected to a B branch of a low-voltage side of a split winding transformer 1-2 for the thermal power plant station, and the B section station load 1-8 is connected to the B section 1-6 of the 6.3kV station power through a B section station load grid-connected switch 1-7.
The energy storage centralized current conversion transformation unit 2 comprises: the energy storage grid-connected device comprises a section A energy storage grid-connected switch 2-1, a section A energy storage 6kV/400V step-down converter 2-2, a section A energy storage centralized converter 2-3, a section B energy storage grid-connected switch 2-4, a section B energy storage 6kV/400V step-down converter 2-5 and a section B energy storage centralized converter 2-6.
The A section energy storage 6kV/400V voltage reduction transformer 2-2 high-voltage side is connected to the 6.3kV station service A section 1-3 through the A section energy storage grid-connected switch 2-1, and the A section energy storage centralized converter device 2-3 alternating current side is connected to the A section energy storage 6kV/400V voltage reduction transformer 2-2 low-voltage side. The high-voltage side of the B section energy storage 6kV/400V step-down transformer is connected to the B section 1-6 of the 6.3kV station power supply through the B section energy storage grid-connected switch 2-4, and the alternating-current side of the B section energy storage centralized converter device 2-6 is connected to the low-voltage side of the B section energy storage 6kV/400V step-down transformer 2-5.
The section A energy storage centralized converter device 2-3 and the section B energy storage centralized converter device 2-6 can realize high-power energy exchange between the energy storage unit and the thermal power generating unit, can be matched with the thermal power generating unit to carry out WM-level power adjustment, and are suitable for the field of thermal power energy storage. The section A energy storage centralized converter devices 2-3 and the section B energy storage centralized converter devices 2-6 adopt high-power high-frequency IGBT components, the maximum short-circuit current which can be provided by an energy storage system is not more than 1.5 times of the rated current, and the protection system for the original thermal power plant cannot be influenced.
The energy storage device unit 3 includes: the energy storage device comprises an A-section energy storage direct current breaker 3-1, an A-section energy storage device 3-2, a B-section energy storage direct current breaker 3-3 and a B-section energy storage device 3-4.
The section A energy storage equipment 3-2 is connected to the DC side of the section A energy storage centralized converter device 2-3 through the section A energy storage DC circuit breaker 3-1, and the section B energy storage equipment 3-4 is connected to the DC side of the section B energy storage centralized converter device 2-6 through the section B energy storage DC circuit breaker 3-3.
The energy storage equipment 3-2 at the section A and the energy storage equipment 3-4 at the section B realize power centralized exchange through the energy storage centralized converter device 2-3 at the section A and the energy storage centralized converter device 2-6 at the section B, and single energy storage devices in the energy storage equipment 3-2 at the section A and the energy storage equipment 3-4 at the section B are not required to be connected with an energy storage converter. The material cost is saved, the engineering change is small, the energy storage unit can be regarded as a service load, the switching of the energy storage unit is realized by switching off the A section of energy storage grid-connected switch 2-1 and the B section of energy storage grid-connected switch 2-4, and the energy storage device is more suitable for the field of energy storage auxiliary thermal power regulation.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. The utility model provides a thermal power plant is with concentrated current conversion system of energy storage which characterized in that includes: the system comprises a power supply unit (1), an energy storage centralized current conversion transformation unit (2) and an energy storage device unit (3) for the thermal power plant;
the energy storage device unit (3) is divided into A, B units, and is connected to an energy storage A, B section in the energy storage centralized current conversion transformation unit (2) through a direct current breaker, and an energy storage A, B section is connected to a 6kV/400V voltage reduction transformer of a power supply A, B section in the power supply unit (1) for the thermal power plant through a centralized current conversion device, so that the energy storage unit and the thermal power plant are exchanged for the power supply energy, and the energy storage is participated in the adjustment process of the thermal power plant.
2. The centralized energy storage converter system for thermal power plants according to claim 1, wherein the plant alternating current 6.3kV unit (1) comprises: the system comprises a thermal power generator (1-1), a thermal power plant split winding transformer (1-2), a 6.3kV plant power A section (1-3), a plant power load grid-connected switch (1-4) of the A section, a plant power load (1-5) of the A section, a 6.3kV plant power B section (1-6), a plant power load grid-connected switch (1-7) of the B section and a plant power load (1-8) of the B section;
an outlet of the thermal power generator (1-1) is connected with a high-voltage side of a thermal power plant split winding transformer (1-2), the 6.3kV plant power A section (1-3) is connected to a low-voltage side A branch of the thermal power plant split winding transformer (1-2), and the A section plant load (1-5) is connected to the 6.3kV plant power A section (1-3) through the A section plant load grid-connected switch (1-4); the 6.3kV station service B section (1-6) is connected to a low-voltage side B branch of a split winding transformer (1-2) for the thermal power plant station, and a station service load (1-8) of the B section is connected to the 6.3kV station service B section (1-6) through a station service load grid-connected switch (1-7).
3. The energy storage centralized converter system for the thermal power plant according to claim 2, wherein the energy storage centralized converter transformer unit (2) comprises: the energy-saving converter comprises an A section energy storage grid-connected switch (2-1), an A section energy storage 6kV/400V step-down transformer (2-2), an A section energy storage centralized converter device (2-3), a B section energy storage grid-connected switch (2-4), a B section energy storage 6kV/400V step-down transformer (2-5) and a B section energy storage centralized converter device (2-6);
the high-voltage side of the A-section energy storage 6kV/400V voltage reduction transformer (2-2) is connected to the 6.3kV station service A section (1-3) through the A-section energy storage grid-connected switch (2-1), and the alternating-current side of the A-section energy storage centralized converter device (2-3) is connected to the low-voltage side of the A-section energy storage 6kV/400V voltage reduction transformer (2-2); the B section energy storage 6kV/400V voltage reduction transformer (2-5) high-voltage side is connected to the 6.3kV station service B section (1-6) through the B section energy storage grid-connected switch (2-4), and the B section energy storage centralized current conversion device (2-6) alternating current side is connected to the B section energy storage 6kV/400V voltage reduction transformer (2-5) low-voltage side.
4. The energy storage centralized converter system for the thermal power plant according to claim 3, wherein the A-section energy storage centralized converter device (2-3) and the B-section energy storage centralized converter device (2-6) can realize high-power energy exchange between the energy storage unit and the thermal power unit, and cooperate with the thermal power unit to perform WM-level power adjustment.
5. The energy storage centralized converter system for the thermal power plant according to claim 3, wherein the A-section energy storage centralized converter devices (2-3) and the B-section energy storage centralized converter devices (2-6) adopt high-power high-frequency IGBT components, and the maximum short-circuit current provided by the energy storage system is not more than 1.5 times of the rated current.
6. An energy storage centralized converter system for thermal power plants according to claim 3, characterized in that the energy storage device unit (3) comprises: the energy storage device comprises an A-section energy storage direct current breaker (3-1), an A-section energy storage device (3-2), a B-section energy storage direct current breaker (3-3) and a B-section energy storage device (3-4);
the section A energy storage equipment (3-2) is connected to the direct current side of the section A energy storage centralized converter device (2-3) through the section A energy storage direct current breaker (3-1), and the section B energy storage equipment (3-4) is connected to the direct current side of the section B energy storage centralized converter device (2-6) through the section B energy storage direct current breaker (3-3).
7. The energy storage centralized converter system for the thermal power plant according to claim 6, wherein the A-section energy storage equipment (3-2) and the B-section energy storage equipment (3-4) realize power centralized exchange through the A-section energy storage centralized converter device (2-3) and the B-section energy storage centralized converter device (2-6).
8. The centralized energy storage energy conversion system for the thermal power plant according to claim 6, wherein the energy storage units are regarded as service loads, and switching of the energy storage units is realized by switching off the A-section energy storage grid-connected switch (2-1) and the B-section energy storage grid-connected switch (2-4).
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| CN202111556252.9A CN114243739A (en) | 2021-12-17 | 2021-12-17 | Energy storage centralized converter system for thermal power plant |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114825482A (en) * | 2022-06-29 | 2022-07-29 | 西安热工研究院有限公司 | Super capacitor voltage stabilizing system and method for thermal power frequency modulation |
| CN114825597A (en) * | 2022-06-29 | 2022-07-29 | 西安热工研究院有限公司 | Thermal power high-voltage direct-hanging energy storage backup power supply system for plant |
| CN115189380A (en) * | 2022-09-08 | 2022-10-14 | 西安热工研究院有限公司 | Flywheel energy storage system for controllable low-voltage thermal power plant and control method |
-
2021
- 2021-12-17 CN CN202111556252.9A patent/CN114243739A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114825482A (en) * | 2022-06-29 | 2022-07-29 | 西安热工研究院有限公司 | Super capacitor voltage stabilizing system and method for thermal power frequency modulation |
| CN114825597A (en) * | 2022-06-29 | 2022-07-29 | 西安热工研究院有限公司 | Thermal power high-voltage direct-hanging energy storage backup power supply system for plant |
| CN114825597B (en) * | 2022-06-29 | 2022-09-27 | 西安热工研究院有限公司 | Thermal power high-voltage direct-hanging energy storage backup power supply system for plant |
| CN115189380A (en) * | 2022-09-08 | 2022-10-14 | 西安热工研究院有限公司 | Flywheel energy storage system for controllable low-voltage thermal power plant and control method |
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