CN114123268A - Concentrated conversion high-frequency boosting thermal power energy storage system - Google Patents
Concentrated conversion high-frequency boosting thermal power energy storage system Download PDFInfo
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- CN114123268A CN114123268A CN202111554332.0A CN202111554332A CN114123268A CN 114123268 A CN114123268 A CN 114123268A CN 202111554332 A CN202111554332 A CN 202111554332A CN 114123268 A CN114123268 A CN 114123268A
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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
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a centralized current conversion high-frequency boosting thermal power energy storage system, which comprises: the device comprises an alternating current 6.3kV unit for a fire plant, a centralized current conversion high-frequency boosting unit and an energy storage equipment unit; the energy storage equipment unit is divided into A, B two energy storage units, the energy storage units are respectively connected to an energy storage A, B section through DC/AC converter devices in the energy storage equipment unit, an energy storage A, B section is respectively connected to low-voltage sides of A, B two high-frequency voltage boosting devices through AC/DC concentrated converter devices in the concentrated converter high-frequency voltage boosting units, and high-voltage sides of A, B two high-frequency voltage boosting devices are connected with A, B two sections of 6.3kV service buses in the service alternating current 6.3kV unit through an energy storage grid-connected switch. 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 adopts high-frequency boosting. The high-frequency boosting unit is used for realizing direct frequency boosting and boosting of 400V/6.3kV of the energy storage system, so that the grid connection adjustment of the energy storage equipment is more flexible.
Description
Technical Field
The invention relates to a centralized current conversion high-frequency boosting thermal power energy storage system, which overcomes the defects of complex control and high failure rate of a single energy storage current conversion device by the centralized current conversion of an energy storage unit and uses high-frequency boosting. The high-frequency boosting unit is used for realizing direct frequency boosting and boosting of 400V/6.3kV of the energy storage system, so that the grid connection adjustment of the energy storage equipment is more flexible.
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. The high-frequency boosting unit has certain advantages in the aspects of power quality adjustment, harmonic suppression and the like, and has a series of functional advantages of voltage grade conversion, electrical isolation, power adjustment and control and the like.
Disclosure of Invention
The invention aims to provide a centralized current conversion high-frequency boosting thermal power energy storage system, which overcomes the defects of complex control and high failure rate of a single energy storage current conversion device by the centralized current conversion of an energy storage unit and uses high-frequency boosting. The high-frequency boosting unit is used for realizing direct frequency boosting and boosting of 400V/6.3kV of the energy storage system, so that the grid connection adjustment of the energy storage equipment is more flexible.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a centralized current conversion high-frequency boosting thermal power energy storage system comprises: the device comprises an alternating current 6.3kV unit for a fire plant, a centralized current conversion high-frequency boosting unit and an energy storage equipment unit;
the energy storage equipment unit is divided into A, B two energy storage units, the energy storage units are respectively connected to an energy storage A, B section through DC/AC converter devices in the energy storage equipment unit, an energy storage A, B section is respectively connected to low-voltage sides of A, B two high-frequency voltage boosting devices through AC/DC concentrated converter devices in the concentrated converter high-frequency voltage boosting units, and high-voltage sides of A, B two high-frequency voltage boosting devices are connected with A, B two sections of 6.3kV service buses in the service alternating current 6.3kV unit through an energy storage grid-connected switch.
In a further development of the invention, the service ac 6.3kV unit comprises: a, a thermal power generator, a thermal power plant split winding transformer, a 6.3kV plant power A section, a section A plant load grid-connected switch, a section A plant load, a 6.3kV plant power B section, a section B plant load grid-connected switch and a section B plant load;
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.
In a further improvement of the present invention, the centralized commutating high frequency boosting unit comprises: the energy storage grid-connected device comprises a segment A energy storage grid-connected switch, a segment A energy storage power electronic transformer DC/AC converter, a segment A energy storage power electronic transformer high-voltage side filter capacitor, a segment A energy storage power electronic transformer isolated DC-DC converter, a segment A energy storage power electronic transformer low-voltage side filter capacitor, a segment A energy storage centralized AC/DC converter device, a segment B energy storage grid-connected switch, a segment B energy storage power electronic transformer DC/AC converter, a segment B energy storage power electronic transformer high-voltage side filter capacitor, a segment B energy storage power electronic transformer isolated DC-DC converter, a segment B energy storage power electronic transformer low-voltage side filter capacitor and a segment B energy storage centralized AC/DC converter device;
the alternating current side of the DC/AC converter of the A-section energy storage power electronic transformer is connected to the A section of the 6.3kV service power through the A-section energy storage grid-connected switch; the high-voltage side of the A-section energy storage power electronic transformer isolation type DC-DC converter is connected to the DC side of the DC/AC converter of the A-section energy storage power electronic transformer through the high-voltage side filter capacitor of the A-section energy storage power electronic transformer; the alternating current side of the A-section energy storage centralized AC/DC converter device is connected to the low-voltage side of the A-section energy storage power electronic transformer isolated DC-DC converter through the low-voltage side filter capacitor of the A-section energy storage power electronic transformer; the alternating current side of the DC/AC converter of the B-section energy storage power electronic transformer is connected to the B section of the 6.3kV service power through the B-section energy storage grid-connected switch; the high-voltage side of the B-section energy storage power electronic transformer isolation type DC-DC converter is connected to the DC side of the DC/AC converter of the B-section energy storage power electronic transformer through the high-voltage side filter capacitor of the B-section energy storage power electronic transformer; and the alternating current side of the B-section energy storage centralized AC/DC converter device is connected to the low-voltage side of the B-section energy storage power electronic transformer isolated DC-DC converter through the low-voltage side filter capacitor of the B-section energy storage power electronic transformer.
In a further improvement of the present invention, the isolated DC-DC converter of the a-stage energy storage power electronic transformer and the isolated DC-DC converter of the B-stage energy storage power electronic transformer include: the system comprises a single-phase full-bridge inverter, an isolated DC-DC converter filter inductor, an isolated DC-DC converter filter capacitor, a high-frequency transformer and a single-phase full-bridge rectifier; the single-phase full-bridge inverter is connected in series with the high-voltage side of the high-frequency transformer through the isolated DC-DC converter filter inductor and the isolated DC-DC converter filter capacitor, and the low-voltage side of the high-frequency transformer is connected with the single-phase full-bridge rectifier; the rated frequency of the high-frequency transformer is 10kHz, and voltage change is realized through frequency change.
The invention has the further improvement that the A-section energy storage centralized AC/DC converter device and the B-section energy storage centralized AC/DC converter device can realize high-power energy exchange between the energy storage unit and the thermal power generating unit and cooperate with the thermal power generating unit to carry out WM-level power regulation; the section A energy storage concentrated AC/DC converter device and the section B energy storage concentrated AC/DC converter device adopt high-power high-frequency IGBT components, and 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.
The invention has the further improvement that when the thermal power energy storage system needs the energy storage unit to absorb the electric energy, the high-voltage alternating current is converted into high-voltage direct current through the A-section energy storage power electronic transformer DC/AC converter and the B-section energy storage power electronic transformer DC/AC converter, the high-voltage direct current is filtered through the A-section energy storage power electronic transformer high-voltage side filter capacitor and the B-section energy storage power electronic transformer high-voltage side filter capacitor and then is transmitted to the A-section energy storage power electronic transformer isolated DC-DC converter and the B-section energy storage power electronic transformer isolated DC-DC converter, the A-section energy storage power electronic transformer isolated DC-DC converter and the B-section energy storage power electronic transformer isolated DC-DC converter comprise high-frequency transformers, and the high-frequency transformers realize voltage reduction by reducing the frequency, and after the direct current reduced by the A-section energy storage power electronic transformer isolated DC-DC converter and the B-section energy storage power electronic transformer isolated DC-DC converter is filtered by the A-section energy storage power electronic transformer low-voltage side filter capacitor and the B-section energy storage power electronic transformer low-voltage side filter capacitor, the direct current is transmitted to the A-section energy storage centralized AC/DC converter device and the B-section energy storage centralized AC/DC converter device to form low-voltage alternating current, and the low-voltage alternating current is transmitted to the energy storage device.
The further improvement of the invention is that when the thermal power energy storage system needs the energy storage unit to release electric energy, the low-voltage alternating current of the energy storage unit forms low-voltage direct current through the A section energy storage centralized AC/DC converter device and the B section energy storage centralized AC/DC converter device, the low-voltage direct current is filtered through the A section energy storage power electronic transformer low-voltage side filter capacitor and the B section energy storage power electronic transformer low-voltage side filter capacitor and then is transmitted to the A section energy storage power electronic transformer isolated DC-DC converter and the B section energy storage power electronic transformer isolated DC-DC converter, the A section energy storage power electronic transformer isolated DC-DC converter and the B section energy storage power electronic transformer isolated DC-DC converter contain high-frequency transformers, and the high-frequency transformers increase the frequency to realize the voltage increase, the boosted high-voltage direct current is filtered by the high-voltage side filter capacitor of the A-section energy storage power electronic transformer and the high-voltage side filter capacitor of the B-section energy storage power electronic transformer, and the filtered high-voltage direct current is converted into high-voltage alternating current by the DC/AC converter of the A-section energy storage power electronic transformer and the DC/AC converter of the B-section energy storage power electronic transformer and is merged into a 6.3kV station power system.
A further development of the invention is that the energy storage device unit comprises: the energy-saving converter comprises an A-section energy-storing PCS converter device, an A-section energy-storing device, a B-section energy-storing PCS converter device and a B-section energy-storing device;
the A set of stored energy is connected to the alternating current side of the A section of energy storage centralized AC/DC convertor device through the A section of energy storage PCS convertor device, and the B set of stored energy is connected to the alternating current side of the B section of energy storage centralized AC/DC convertor device through the B section of energy storage PCS convertor device.
Compared with the prior art, the invention has at least the following beneficial technical effects:
1. the centralized AC/DC converter device adopted by the invention overcomes the defects of complex control and high failure rate of a single energy storage converter device, and the energy storage system can carry out WM-level power regulation when being matched with a thermal power generating unit for regulation.
2. The invention adopts a separation type DC-DC converter in a centralized current conversion high-frequency boosting unit, adopts N DC-DC conversion units with the same structure at an isolation level, and comprises the following components: the single-phase full-bridge inverter, the high-frequency transformer and the single-phase full-bridge rectifier can realize direct-current transformation and electrical isolation of input and output.
3. The high-frequency transformer adopted by the centralized current conversion high-frequency boosting unit has the rated frequency of 10kHz, realizes voltage change through frequency change, and has smaller volume and convenient maintenance compared with the traditional transformer.
4. The DC/AC converter device adopted in the centralized conversion high-frequency boosting unit can realize unit power factor operation or operation according to thermal power regulation requirements and a given power factor, and is more suitable for the field of energy storage participation in thermal power unit regulation.
5. The designed high-power high-frequency IGBT component adopted by various converter units of the centralized converter high-frequency boosting thermal power energy storage system has the advantages that the maximum short-circuit current provided by the energy storage system is not more than 1.5 times of the rated current, and the influence on the original protective system for a thermal power plant is avoided.
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, a centralized current conversion high-frequency boosting unit; 3-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 power electronic transformer DC/AC converter; 2-3-A section of a high-voltage side filter capacitor of the energy storage power electronic transformer; 2-4-A section energy storage power electronic transformer isolated DC-DC converter; 2-4-1-single phase full bridge inverter; 2-4-2-isolated DC-DC converter filter inductor; 2-4-3-an isolated DC-DC converter filter capacitor; 2-4-high frequency transformer; 2-4-5-single-phase full bridge rectifier; 2-5-A section of low-voltage side filter capacitor of the energy storage power electronic transformer; 2-6-A section energy storage centralized AC/DC converter device; 2-7-B section energy storage grid-connected switch; 2-8-B section energy storage power electronic transformer DC/AC converter; 2-9-B section energy storage power electronic transformer high-voltage side filter capacitor; 2-10-B section energy storage power electronic transformer isolated DC-DC converter; 2-11-B section energy storage power electronic transformer low voltage side filter capacitor; 2-12-B section energy storage centralized AC/DC converter;
a 3-1-A section of energy storage PCS converter device; 3-2-A section of energy storage device; a 3-B section energy storage PCS converter device; and 3-4-B section energy storage device.
Detailed Description
The technical solution of the present invention is further described in detail by the accompanying drawings.
As shown in fig. 1, the present invention provides a centralized commutating high-frequency boosted thermal power energy storage system, which includes: the device comprises a 6.3kV alternating current unit 1 for a fire plant, a centralized current conversion high-frequency boosting unit 2 and an energy storage equipment unit 3; the energy storage equipment unit 3 is divided into A, B two energy storage units, the energy storage units are respectively connected to an energy storage A, B section through a DC/AC converter device in the energy storage equipment unit 3, an energy storage A, B section is respectively connected to low-voltage sides of A, B two high-frequency voltage boosting devices through an AC/DC concentrated converter device in the concentrated current conversion high-frequency voltage boosting unit 2, and high-voltage sides of A, B two high-frequency voltage boosting devices are connected with A, B two sections of 6.3kV service buses in the service alternating current 6.3kV unit 1 through an energy storage grid-connected switch.
The factory alternating current 6.3kV unit 1 comprises: the system comprises a thermal power generator 1-1A, 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 centralized commutation high-frequency boosting unit 2 includes: the system comprises a section A energy storage grid-connected switch 2-1, a section A energy storage power electronic transformer DC/AC converter 2-2, a section A energy storage power electronic transformer high-voltage side filter capacitor 2-3, a section A energy storage power electronic transformer isolated DC-DC converter 2-4, a single-phase full-bridge inverter 2-4-1, an isolated DC-DC converter filter inductor 2-4-2, an isolated DC-DC converter filter capacitor 2-4-3, a high-frequency transformer 2-4, a single-phase full-bridge rectifier 2-4-5, a section A energy storage power electronic transformer low-voltage side filter capacitor 2-5, a section A energy storage centralized AC/DC converter 2-6, a section B energy storage grid-connected switch 2-7, a section B energy storage power electronic transformer DC/AC converter 2-8, a power electronic transformer DC/AC converter 2-8, The high-voltage side filter capacitor 2-9 of the B-section energy storage power electronic transformer, the isolated DC-DC converter 2-10 of the B-section energy storage power electronic transformer, the low-voltage side filter capacitor 2-11 of the B-section energy storage power electronic transformer and the B-section energy storage centralized AC/DC converter device 2-12.
The alternating current side of the A-section energy storage power electronic transformer DC/AC converter 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. The high-voltage side of the A-section energy storage power electronic transformer isolation type DC-DC converter 2-4 is connected to the DC side of the A-section energy storage power electronic transformer DC/AC converter 2-2 through the A-section energy storage power electronic transformer high-voltage side filter capacitor 2-3. And the alternating current side of the A-section energy storage centralized AC/DC converter device 2-6 is connected to the low voltage side of the A-section energy storage power electronic transformer isolated DC-DC converter 2-4 through the low voltage side filter capacitor 2-5 of the A-section energy storage power electronic transformer. And the alternating current side of the DC/AC converter 2-8 of the B-section energy storage power electronic transformer is connected to the B section 1-6 of the 6.3kV station service power through the B-section energy storage grid-connected switch 2-7. The high-voltage side of the B-section energy storage power electronic transformer isolation type DC-DC converter 2-10 is connected to the DC side of the B-section energy storage power electronic transformer DC/AC converter 2-8 through the high-voltage side filter capacitor 2-9 of the B-section energy storage power electronic transformer. And the alternating current side of the B-section energy storage centralized AC/DC converter device 2-12 is connected to the low voltage side of the B-section energy storage power electronic transformer isolated DC-DC converter 2-10 through the low voltage side filter capacitor 2-11 of the B-section energy storage power electronic transformer.
The A section energy storage power electronic transformer isolated DC-DC converter and the B section energy storage power electronic transformer isolated DC-DC converter 2-10 comprise: a single-phase full-bridge inverter 2-4-1; 2-4-2 of an isolated DC-DC converter filter inductor; 2-4-3 of an isolated DC-DC converter filter capacitor; 2-4-4 of a high-frequency transformer; and 2-4-5 of a single-phase full-bridge rectifier. The single-phase full-bridge inverter 2-4-1 is connected in series with the high-voltage side of the high-frequency transformer 2-4-4 through the isolated DC-DC converter filter inductor 2-4-2 and the isolated DC-DC converter filter capacitor 2-4-3, and the low-voltage side of the high-frequency transformer 2-4-4 is connected with the single-phase full-bridge rectifier 2-4-5. The rated frequency of the high-frequency transformer 2-4-4 is 10kHz, voltage change is achieved through frequency change, and compared with a traditional transformer, the high-frequency transformer is smaller in size and convenient to maintain.
The A-section energy storage centralized AC/DC converter devices 2-6 and the B-section energy storage centralized AC/DC converter devices 2-12 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 regulation, and are suitable for the field of thermal power energy storage. The section A energy storage centralized AC/DC converter devices 2-6 and the section B energy storage centralized AC/DC converter devices 2-12 adopt high-power high-frequency IGBT components, the maximum short-circuit current provided by the energy storage system is not more than 1.5 times of the rated current, and the original thermal power plant protection system is not affected.
When the thermal power energy storage system needs an energy storage unit to absorb electric energy, high-voltage alternating current is converted into high-voltage direct current through the A-section energy storage power electronic transformer DC/AC converter 2-2 and the B-section energy storage power electronic transformer DC/AC converter 2-8, the high-voltage direct current is filtered through the A-section energy storage power electronic transformer high-voltage side filter capacitor 2-3 and the B-section energy storage power electronic transformer high-voltage side filter capacitor 2-9 and then is transmitted to the A-section energy storage power electronic transformer isolation type DC-DC converter 2-4 and the B-section energy storage power electronic transformer isolation type DC-DC converter 2-10, the A-section energy storage power electronic transformer isolation type DC-DC converter 2-4 and the B-section energy storage power electronic transformer isolation type DC-DC converter 2-10 comprise high-frequency transformers 2-4-4, the high-frequency transformer 2-4-4 reduces the frequency to reduce the voltage, and the direct current reduced by the A-section energy storage power electronic transformer isolated DC-DC converter 2-4 and the B-section energy storage power electronic transformer isolated DC-DC converter 2-10 is filtered by the A-section energy storage power electronic transformer low-voltage side filter capacitor 2-5 and the B-section energy storage power electronic transformer low-voltage side filter capacitor 2-11, and then is transmitted to the A-section energy storage centralized AC/DC converter device 2-6 and the B-section energy storage centralized AC/DC converter device 2-12 to form low-voltage alternating current, and is transmitted to the energy storage device.
When the thermal power energy storage system needs the energy storage unit to release electric energy, low-voltage alternating current of the energy storage unit forms low-voltage direct current through the A-section energy storage centralized AC/DC converter device 2-6 and the B-section energy storage centralized AC/DC converter device 2-12, the low-voltage direct current is filtered through the A-section energy storage power electronic transformer low-voltage side filter capacitor 2-5 and the B-section energy storage power electronic transformer low-voltage side filter capacitor 2-11 and then is transmitted to the A-section energy storage power electronic transformer isolated DC-DC converter 2-4 and the B-section energy storage power electronic transformer isolated DC-DC converter 2-10, the A-section energy storage power electronic transformer isolated DC-DC converter 2-4 and the B-section energy storage power electronic transformer isolated DC-DC converter 2-10 contain high-frequency transformers 2-4-4, the high-frequency transformer 2-4-4 raises the frequency to realize voltage rise, the boosted high-voltage direct current is filtered by the high-voltage side filter capacitor 2-3 of the A-section energy storage power electronic transformer and the high-voltage side filter capacitor 2-9 of the B-section energy storage power electronic transformer, and the filtered high-voltage direct current is converted into high-voltage alternating current by the DC/AC converter 2-2 of the A-section energy storage power electronic transformer and the DC/AC converter 2-8 of the B-section energy storage power electronic transformer and is merged into a 6.3kV plant power system.
The energy storage device unit 3 includes: the energy-saving power supply system comprises an A-section energy-storing PCS converter device 3-1, an A-section energy-storing device 3-2, a B-section energy-storing PCS converter device 3-3 and a B-section energy-storing device 3-4.
The energy storage 3-2 of the A set is connected to the alternating current side of the energy storage concentrated AC/DC convertor device 2-6 of the A section through the energy storage PCS convertor device 3-1 of the A section, and the energy storage 3-4 of the B set is connected to the alternating current side of the energy storage concentrated AC/DC convertor device 2-12 of the B section through the energy storage PCS convertor device 3-2 of the B section.
The centralized AC/DC converter device adopted by the invention overcomes the defects of complex control and high failure rate of a single energy storage converter device, and the energy storage system can carry out WM-level power regulation when being matched with a thermal power generating unit for regulation.
The invention adopts a separation type DC-DC converter in a centralized current conversion high-frequency boosting unit, adopts N DC-DC conversion units with the same structure at an isolation level, and comprises the following components: the single-phase full-bridge inverter, the high-frequency transformer and the single-phase full-bridge rectifier can realize direct-current transformation and electrical isolation of input and output.
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 concentrate change of current high frequency and boost thermoelectricity energy storage system which characterized in that includes: the device comprises an alternating current 6.3kV unit (1) for a fire plant, a centralized current conversion high-frequency boosting unit (2) and an energy storage equipment unit (3);
the energy storage equipment unit (3) is divided into A, B two energy storage units, the two energy storage units are respectively connected to an energy storage A, B section through a DC/AC converter device in the energy storage equipment unit (3), an energy storage A, B section is respectively connected to low-voltage sides of A, B two high-frequency voltage boosting devices through an AC/DC concentrated converter device in the concentrated current conversion high-frequency voltage boosting unit (2), and high-voltage sides of A, B two high-frequency voltage boosting devices are connected with A, B two sections of 6.3kV station buses in the station AC 6.3kV unit (1) through an energy storage grid-connected switch.
2. The centralized commutating high-frequency boosted thermal power energy storage system according to claim 1, characterized in that the service alternating current 6.3kV unit (1) 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), an A section plant load grid-connected switch (1-4), an A section plant load (1-5), a 6.3kV plant power B section (1-6), a B section plant load grid-connected switch (1-7) and a B section plant load (1-8);
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 centralized commutating high frequency boost thermal power energy storage system according to claim 2, characterized in that the centralized commutating high frequency boost unit (2) comprises: the energy-saving power electronic transformer low-voltage side filter capacitor comprises an A-section energy-storing grid-connected switch (2-1), an A-section energy-storing power electronic transformer DC/AC converter (2-2), an A-section energy-storing power electronic transformer high-voltage side filter capacitor (2-3), an A-section energy-storing power electronic transformer isolated DC-DC converter (2-4), an A-section energy-storing power electronic transformer low-voltage side filter capacitor (2-5), an A-section energy-storing centralized AC/DC converter device (2-6), a B-section energy-storing grid-connected switch (2-7), a B-section energy-storing power electronic transformer DC/AC converter (2-8), a B-section energy-storing power electronic transformer high-voltage side filter capacitor (2-9), a B-section energy-storing power electronic transformer isolated DC-DC converter (2-10), a B-section energy-storing power electronic transformer low-voltage side filter capacitor (2-11) and a B-section energy-storing centralized AC/DC converter device (2-10) 2-12);
the alternating current side of the A-section energy storage power electronic transformer DC/AC converter (2-2) is connected to the 6.3kV station A section (1-3) of the service power through the A-section energy storage grid-connected switch (2-1); the high-voltage side of the A-section energy storage power electronic transformer isolation type DC-DC converter (2-4) is connected to the direct-current side of the A-section energy storage power electronic transformer DC/AC converter (2-2) through the A-section energy storage power electronic transformer high-voltage side filter capacitor (2-3); the alternating current side of the A-section energy storage centralized AC/DC converter device (2-6) is connected to the low voltage side of the A-section energy storage power electronic transformer isolated DC-DC converter (2-4) through the low voltage side filter capacitor (2-5) of the A-section energy storage power electronic transformer; the alternating current side of the B-section energy storage power electronic transformer DC/AC converter (2-8) is connected to the 6.3kV station B (1-6) of the service power through the B-section energy storage grid-connected switch (2-7); the high-voltage side of the B-section energy storage power electronic transformer isolation type DC-DC converter (2-10) is connected to the DC side of the B-section energy storage power electronic transformer DC/AC converter (2-8) through the high-voltage side filter capacitor (2-9) of the B-section energy storage power electronic transformer; and the alternating current side of the B-section energy storage centralized AC/DC converter device (2-12) is connected to the low voltage side of the B-section energy storage power electronic transformer isolated DC-DC converter (2-10) through the low voltage side filter capacitor (2-11) of the B-section energy storage power electronic transformer.
4. The centralized commutating high-frequency boost thermal power energy storage system according to claim 3, wherein the A-section energy storage power electronic transformer isolated DC-DC converter and the B-section energy storage power electronic transformer isolated DC-DC converter (2-10) comprise: the system comprises a single-phase full-bridge inverter (2-4-1), an isolated DC-DC converter filter inductor (2-4-2), an isolated DC-DC converter filter capacitor (2-4-3), a high-frequency transformer (2-4-4) and a single-phase full-bridge rectifier (2-4-5); the single-phase full-bridge inverter (2-4-1) is connected to the high-voltage side of the high-frequency transformer (2-4-4) in series through the isolated DC-DC converter filter inductor (2-4-2) and the isolated DC-DC converter filter capacitor (2-4-3), and the low-voltage side of the high-frequency transformer (2-4-4) is connected to the single-phase full-bridge rectifier (2-4-5); the rated frequency of the high-frequency transformer (2-4-4) is 10kHz, and voltage change is realized through frequency change.
5. The centralized energy storage system for the commutated high-frequency boost thermal power according to claim 3, wherein the a-section energy storage centralized AC/DC converter devices (2-6) and the B-section energy storage centralized AC/DC converter devices (2-12) 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 regulation; the section A energy storage centralized AC/DC converter devices (2-6) and the section B energy storage centralized AC/DC converter devices (2-12) 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. The centralized-conversion high-frequency boosting thermal power energy storage system according to claim 4, wherein when the thermal power energy storage system needs an energy storage unit to absorb electric energy, high-voltage alternating current is converted into high-voltage direct current through the A-section energy storage power electronic transformer DC/AC converter (2-2) and the B-section energy storage power electronic transformer DC/AC converter (2-8), high-voltage direct current is filtered by the A-section energy storage power electronic transformer high-voltage side filter capacitor (2-3) and the B-section energy storage power electronic transformer high-voltage side filter capacitor (2-9) and then transmitted to the A-section energy storage power electronic transformer isolated DC-DC converter (2-4) and the B-section energy storage power electronic transformer isolated DC-DC converter (2-10), and the A-section energy storage power electronic transformer isolated DC-DC converters (2-4) and the B-section energy storage power electronic transformer isolated DC-DC converter (2-10) The section energy storage power electronic transformer isolation type DC-DC converter (2-10) comprises a high-frequency transformer (2-4-4), the high-frequency transformer (2-4-4) reduces the voltage by reducing the frequency, the direct current reduced by the section A energy storage power electronic transformer isolation type DC-DC converter (2-4) and the section B energy storage power electronic transformer isolation type DC-DC converter (2-10) is filtered by the section A energy storage power electronic transformer low-voltage side filter capacitor (2-5) and the section B energy storage power electronic transformer low-voltage side filter capacitor (2-11) and then is transmitted to the section A energy storage concentrated AC/DC converter device (2-6) and the section B energy storage concentrated AC/DC converter device (2-12) to form low-voltage alternating current, and transmitted to the energy storage device.
7. The centralized-conversion high-frequency boosting thermal power energy storage system according to claim 4, wherein when the thermal power energy storage system needs an energy storage unit to release electric energy, low-voltage alternating current of the energy storage unit forms low-voltage direct current through the A-section energy storage centralized AC/DC converter device (2-6) and the B-section energy storage centralized AC/DC converter device (2-12), the low-voltage direct current is filtered by the A-section energy storage power electronic transformer low-voltage side filter capacitor (2-5) and the B-section energy storage power electronic transformer low-voltage side filter capacitor (2-11), and then is transmitted to the A-section energy storage power electronic transformer isolated DC-DC converter (2-4) and the B-section energy storage power electronic transformer isolated DC-DC converter (2-10), and the A-section energy storage power electronic transformer isolated DC-DC converter (2-4) and the B-section energy storage power electronic transformer isolated DC-DC converter (2-10) The power electronic transformer isolation type DC-DC converter (2-10) comprises a high-frequency transformer (2-4-4), the high-frequency transformer (2-4-4) raises the frequency to achieve voltage rise, the boosted high-voltage direct current is filtered through a high-voltage side filter capacitor (2-3) of the A-section energy storage power electronic transformer and a high-voltage side filter capacitor (2-9) of the B-section energy storage power electronic transformer, and the filtered high-voltage direct current is converted into high-voltage alternating current through a DC/AC converter (2-2) of the A-section energy storage power electronic transformer and a DC/AC converter (2-8) of the B-section energy storage power electronic transformer and is incorporated into a 6.3kV plant power system.
8. The centralized commutating high frequency boosted thermal power energy storage system according to claim 3, characterized in that the energy storage equipment unit (3) comprises: the energy-saving power supply system comprises an A-section energy-storing PCS (Power conversion System) converter device (3-1), an A-section energy-storing device (3-2), a B-section energy-storing PCS converter device (3-3) and a B-section energy-storing device (3-4);
the energy storage devices (3-2) in the A set are connected to the alternating current side of the energy storage concentration AC/DC convertor devices (2-6) in the A section through the energy storage PCS convertor devices (3-1) in the A section, and the energy storage devices (3-4) in the B set are connected to the alternating current side of the energy storage concentration AC/DC convertor devices (2-12) in the B section through the energy storage PCS convertor devices (3-2) in the B section.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114825484A (en) * | 2022-06-29 | 2022-07-29 | 西安热工研究院有限公司 | Frequency modulation system and method based on energy storage of thermal power electronic transformer |
| CN114825483A (en) * | 2022-06-29 | 2022-07-29 | 西安热工研究院有限公司 | Thermal power generating unit frequency modulation system, method and device |
| CN114825450A (en) * | 2022-06-29 | 2022-07-29 | 西安热工研究院有限公司 | Light storage grid-connected plant system adopting power electronic transformation SOP |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114825484A (en) * | 2022-06-29 | 2022-07-29 | 西安热工研究院有限公司 | Frequency modulation system and method based on energy storage of thermal power electronic transformer |
| CN114825483A (en) * | 2022-06-29 | 2022-07-29 | 西安热工研究院有限公司 | Thermal power generating unit frequency modulation system, method and device |
| CN114825450A (en) * | 2022-06-29 | 2022-07-29 | 西安热工研究院有限公司 | Light storage grid-connected plant system adopting power electronic transformation SOP |
| CN114825484B (en) * | 2022-06-29 | 2022-09-30 | 西安热工研究院有限公司 | Frequency modulation system and method based on energy storage of thermal power electronic transformer |
| WO2024001674A1 (en) * | 2022-06-29 | 2024-01-04 | 华能罗源发电有限责任公司 | Photovoltaic storage flexible grid-connected system and method |
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