CN114825450B - Light storage grid-connected plant system adopting power electronic transformation SOP - Google Patents
Light storage grid-connected plant system adopting power electronic transformation SOP Download PDFInfo
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- CN114825450B CN114825450B CN202210747862.5A CN202210747862A CN114825450B CN 114825450 B CN114825450 B CN 114825450B CN 202210747862 A CN202210747862 A CN 202210747862A CN 114825450 B CN114825450 B CN 114825450B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- 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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
-
- 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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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- Engineering & Computer Science (AREA)
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- Supply And Distribution Of Alternating Current (AREA)
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Abstract
The application relates to the technical field of power transmission, in particular to an optical storage grid-connected plant system adopting power electronic transformation SOP. Wherein, this light stores up system for power supply side of being incorporated into power networks includes: the system comprises units for thermal power plants, power electronic transformation SOP units and light storage micro-grid units; the thermal power plant unit comprises a 6kV plant bus and is used for carrying out power transmission on a power grid system; the light storage micro-grid unit comprises a 400V comprehensive energy bus and is used for carrying out power transmission on thermal power plant units through a power electronic transformation (SOP) unit; the high-voltage side of power electronics vary voltage SOP unit is connected to 6kV mill and uses the generating line, and the low-voltage side of power electronics vary voltage SOP unit is connected to 400V comprehensive energy generating line for when thermal power plant carries out power transmission with unit and light storage microgrid unit, provide the power transmission passageway. By adopting the scheme, the failure rate of the optical storage grid-connected plant system equipment is low, the control mode is flexible, and the power supply reliability is high.
Description
Technical Field
The application relates to the technical field of power transmission, in particular to an optical storage grid-connected plant system adopting power electronic transformation SOP.
Background
With the development of science and technology, thermal power plants are being transformed and upgraded towards integrated energy load source supply enterprises. In the related art, when a photovoltaic system is used as one of load sources and incorporated into a high-voltage bus system for a thermal power plant, a corresponding access scheme needs to be selected according to different access capacities. The solutions have a common point that both the power supply and the load are connected to the high-voltage bus system for the thermal power plant. But this would exceed the original design capacity of the bus bar and require extended spacing. In addition, after a large-capacity load is connected, the short-circuit current exceeds the limit, and further equipment in a high-voltage bus system for a thermal power plant needs to be transformed on a large scale. Secondly, the increase of equipment in the high-voltage bus system for the thermal power plant can lead to the increase of fault points, and further can lead to the increase of bus fault probability.
Disclosure of Invention
The application provides an optical storage grid-connected plant system adopting power electronic transformation SOP, and mainly aims to provide an optical storage grid-connected plant system which is low in equipment failure rate, flexible in control mode and high in power supply reliability.
According to an aspect of the present application, there is provided a system for grid-connected optical storage plant using power electronic transformation SOP, comprising: the system comprises units for thermal power plants, power electronic transformation SOP units and light storage micro-grid units;
the thermal power plant unit comprises a 6kV plant bus and is used for carrying out power transmission on a power grid system;
the light storage micro-grid unit comprises a 400V comprehensive energy bus and is used for carrying out power transmission on the thermal power plant unit through a power electronic transformation (SOP) unit;
the high pressure side of power electronics vary voltage SOP unit is connected to 6kV factory uses the generating line to connect, the low pressure side of power electronics vary voltage SOP unit is connected to 400V comprehensive energy generating line is used for thermal power plant with the light stores up little electric wire netting unit when carrying out power transmission, provides the power transmission passageway.
Optionally, in an embodiment of the present application, the 6kV service bus includes: 6kV mill is with A section generating line and 6kV mill is with B section generating line, thermal power plant still includes with the unit: the system comprises a thermal power generator, a thermal power unit main transformer, a thermal power unit high-rise transformer, a 6kV factory A-section bus grid-connected switch, a 6kV factory B-section bus grid-connected switch, a 6kV factory A-section load grid-connected switch, a 6kV factory B-section load grid-connected switch, a 6kV factory A-section load and a 6kV factory B-section load;
wherein, thermal power generator is connected to thermal power unit owner become with the high-pressure side that thermal power unit high plant becomes, the low-pressure side A branch that thermal power unit high plant becomes passes through 6kV plant is connected to with A section generating line on-grid switch 6kV plant is with A section generating line, the low-pressure side B branch that thermal power unit high plant becomes passes through 6kV plant is connected to with B section generating line on-grid switch 6kV plant is with B section generating line, 6kV plant is with A section load passes through 6kV plant is with A section load on-grid switch is connected to 6kV plant is with A section generating line, 6kV plant is with B section load on-grid switch is connected to 6kV plant is with B section generating line.
Optionally, in an embodiment of the present application, the 6kV service bus includes: 6kV mill with A section generating line and 6kV mill with B section generating line, power electronics vary voltage SOP unit includes: the power transmission system comprises a power transmission switch, an SOP DC/AC converter, an SOP high-voltage side filter capacitor, a power electronic transformer isolation type DC-DC converter, an SOP low-voltage side filter capacitor and an SOP AC/DC converter;
wherein the alternating current side of the SOP DC/AC converter is connected to the 6kV station B bus through the power transmission switch, the direct current side of the SOP DC/AC converter is connected to the high voltage side of the power electronic transformer isolated DC-DC converter through the SOP high voltage side filter capacitor, the low voltage side of the power electronic transformer isolated DC-DC converter is connected to the direct current side of the SOP AC/DC converter through the SOP low voltage side filter capacitor, and the alternating current side of the SOP AC/DC converter is connected to the 400V integrated energy bus.
Optionally, in an embodiment of the present application, the power electronic transformer isolated DC-DC converter includes a high frequency transformer;
the high-frequency transformer is used for controlling the output voltage of the high-frequency transformer by controlling the frequency of the high-frequency transformer.
Optionally, in an embodiment of the present application, the SOP · DC/AC converter, the power electronic transformer isolated DC-DC converter, and the SOP · AC/DC converter are all back-to-back voltage source fully controlled power electronic devices.
Optionally, in an embodiment of the present application, the SOP · DC/AC converter and the SOP · AC/DC converter are provided with a four-quadrant power control function, and the four-quadrant power control function corresponds to a power response time of millisecond order;
when the thermal power plant unit and the light storage micro grid unit transmit power through the power electronic transformation SOP unit, power transmission is performed through a power four-quadrant operation mode.
Optionally, in an embodiment of the present application, the SOP · DC/AC converter adopts a reactive power control mode and a constant direct current voltage control mode, and the SOP · AC/DC converter adopts a reactive power control mode and a constant alternating current side voltage control mode.
Optionally, in an embodiment of the present application, when the SOP · DC/AC converter, the power electronic transformer isolated DC-DC converter, and the SOP · AC/DC converter operate, the converter operates according to a preset power factor according to a real-time power regulation requirement of an electrical load.
Optionally, in an embodiment of the present application, the optical storage microgrid control center is further included;
the light storage micro-grid control center is used for controlling the power transmission size, the power transmission form and the power transmission direction of the power electronic transformation SOP unit.
Optionally, in an embodiment of the present application, the light storage microgrid unit further includes: the system comprises a photovoltaic power generation system grid-connected switch, a photovoltaic inverter, a photovoltaic panel, an energy storage system grid-connected switch, an energy storage system PCS, an energy storage element, a comprehensive energy load grid-connected switch and a comprehensive energy load;
the photovoltaic panel is connected to the 400V comprehensive energy bus through the photovoltaic inverter and the photovoltaic power generation system grid-connected switch, the energy storage element is connected to the 400V comprehensive energy bus through the energy storage system PCS and the energy storage system grid-connected switch, and the comprehensive energy load is connected to the 400V comprehensive energy bus through the comprehensive energy load grid-connected switch.
To sum up, the light storage grid-connected plant system adopting power electronic transformation SOP provided by the embodiment of one aspect of the application comprises: the system comprises units for thermal power plants, power electronic transformation SOP units and light storage micro-grid units; the thermal power plant unit comprises a 6kV plant bus and is used for carrying out power transmission on a power grid system; the light storage micro-grid unit comprises a 400V comprehensive energy bus and is used for carrying out power transmission on the thermal power plant unit through a power electronic transformation (SOP) unit; the high pressure side of power electronics vary voltage SOP unit is connected to 6kV factory uses the generating line to connect, the low pressure side of power electronics vary voltage SOP unit is connected to 400V comprehensive energy generating line is used for thermal power plant with the light stores up little electric wire netting unit when carrying out power transmission, provides the power transmission passageway. This application is through storing up light little electric wire netting unit and power electronics vary voltage SOP unit and merging into thermal power plant with high-pressure bus system as the partly of flexible distribution network, can not surpass the original design capacity of thermal power unit for original plant bus, consequently can need not to expand the interval. In addition, the light storage micro-grid unit is connected with the thermal power plant unit through the power electronic transformation SOP unit, so that the increase of equipment in the thermal power plant high-voltage bus system when the light storage micro-grid unit is incorporated into the thermal power plant high-voltage bus system can be reduced, and the equipment failure rate can be further reduced. And the light storage micro-grid unit is connected with the thermal power plant unit through the power electronic transformation SOP unit, so that short-circuit current after high-capacity load is connected can be reduced, and the degree of transformation of equipment in a high-voltage bus system for the thermal power plant can be reduced. And the control mode of the optical storage grid-connected plant system adopting the power electronic transformation SOP is flexible and the power supply reliability is high.
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 foregoing and/or additional aspects and advantages of the present application 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 optical storage grid-connected plant system using power electronic transformation SOP according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a unit for a thermal power plant provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of a power electronic transformation SOP unit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an optical storage grid-connected plant system using power electronic transformation SOP according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a light storage micro grid unit according to an embodiment of the present application.
Description of reference numerals: 1, units for thermal power plants; 2-power electronic transformation SOP unit; 3-light storage micro-grid unit; 4, controlling the center by the light storage micro-grid;
1-a thermal power generator; 1-2-main transformer of thermal power generating unit; 1-3-high power station change of a thermal power generating unit; a section of bus grid-connected switch for factories of 1-4-6 kV; a B-section bus grid-connected switch for 1-5-6 kV factories; 1-6 kV factory A section bus; 1-7-6 kV factory B section bus; 1-8-6 kV factory A-section load grid-connected switch; 1-9-6 kV factory B-section load grid-connected switch; 1-10-6 kV factory A section load; 1-11-6 kV factory B section load;
2-1-power transfer switch; 2-SOP DC/AC converter; 2-3-a SOP high-voltage side filter capacitor; 2-4-power electronic transformer isolated DC-DC converter; 2-5-a SOP low-voltage side filter capacitor; 2-6-SOP.AC/DC converter;
3-1-400V comprehensive energy bus; 3-2, a grid-connected switch of the photovoltaic power generation system; 3-a photovoltaic inverter; 3-4-photovoltaic panel; 3-5, an energy storage system grid-connected switch; 3-6-energy storage system PCS; 3-7-energy storage element; 3-8-comprehensive energy load grid-connected switch; 3-9-comprehensive energy load.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar 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 application and are not to be construed as limiting the present application. On the contrary, the embodiments of the application include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
The present application will be described in detail with reference to specific examples.
Fig. 1 is a schematic structural diagram of an optical storage grid-connected plant system using power electronic transformation SOP according to an embodiment of the present application.
As shown in fig. 1, an optical storage grid-connected plant system using power electronic transformation SOP provided in an embodiment of the present application includes: the system comprises a thermal power plant unit 1, a power electronic transformation SOP unit 2 and a light storage micro-grid unit 3;
the thermal power plant unit 1 comprises a 6kV plant bus and is used for carrying out power transmission on a power grid system;
the light storage micro-grid unit 3 comprises a 400V comprehensive energy bus 3-1 and is used for carrying out power transmission on the thermal power plant unit 1 through a power electronic transformation (SOP) unit 2;
the high-voltage side of the power electronic transformation SOP unit 2 is connected to a 6kV station bus, the low-voltage side of the power electronic transformation SOP unit 2 is connected to a 400V comprehensive energy bus 3-1, and the power electronic transformation SOP unit is used for providing a power transmission channel when the thermal power station unit 1 and the light storage micro-grid unit 3 carry out power transmission.
According to some embodiments, a power distribution network modified by using a flexible power electronic technology is an important trend, and some bottleneck problems in the development of the traditional power distribution network can be effectively solved. The advanced power electronic technology can construct a flexible, reliable and efficient power distribution network, can improve the electric energy quality, reliability and operation efficiency of a power distribution system, and can deal with the fluctuation of traditional loads and proportion renewable energy sources.
In some embodiments, the light storage micro-grid unit 3 and the power electronic transformation SOP unit 2 are incorporated into a thermal power plant as a part of a flexible power distribution network, so that the reliability of a plant system can be improved, the access economy and expandability of photovoltaic and comprehensive energy loads can be improved, and the traditional power generation and multiple operations can be separated. In addition, the light storage micro-grid unit 3 and the power electronic transformation SOP unit 2 are integrated into a high-voltage bus system for a thermal power plant as a part of a flexible power distribution network, so that the original design capacity of the bus for the thermal power plant is not exceeded, and the interval does not need to be expanded.
It is easy to understand that when a flat-price on-line photovoltaic power generation project is built on site by using idle land and roofs in a plant area, a power supply and a load are connected into a high-voltage bus system for a thermal power plant, so that the original design capacity of a bus is exceeded, and further, the interval needs to be expanded. In addition, after a large-capacity load is connected, the short-circuit current exceeds the limit, and further equipment in a high-voltage bus system for a thermal power plant needs to be transformed on a large scale. Secondly, the increase of equipment in the high-voltage bus system for the thermal power plant can lead to the increase of fault points, and further can lead to the increase of bus fault probability. By adopting the light storage grid-connected plant system adopting the power electronic transformation SOP provided by the embodiment of the application, the built photovoltaic power generation device can be directly accessed to a plant power system. Therefore, when the light storage microgrid unit 3 is incorporated into a high-voltage bus system for a thermal power plant, the number of devices added to the high-voltage bus system for the thermal power plant can be reduced, and then the failure rate of the devices can be reduced, so that the economic benefit of a coal-fired power enterprise of the thermal power unit can be improved.
In the embodiment of the present application, fig. 2 is a schematic structural diagram of a unit for a thermal power plant provided in the embodiment of the present application. As shown in fig. 2, the 6kV service bus includes: 6kV mill with A section generating line 1-6 and 6kV mill with B section generating line 1-7, thermal power plant with unit 1 still includes: 1-1 part of a thermal power generator, 1-2 parts of a thermal power unit main transformer, 1-3 parts of a thermal power unit high-plant transformer, 1-4 parts of a section A bus grid-connected switch for 6kV plants, 1-5 parts of a section B bus grid-connected switch for 6kV plants, 1-8 parts of a section A load grid-connected switch for 6kV plants, 1-9 parts of a section B load grid-connected switch for 6kV plants, 1-10 parts of a section A load for 6kV plants and 1-11 parts of a section B load for 6kV plants;
the thermal power generator 1-1 is connected to a thermal power unit main transformer 1-2 and a thermal power unit high-voltage side of a transformer 1-3, a low-voltage side A branch of the thermal power unit high-voltage transformer 1-3 is connected to a 6kV station A section bus 1-6 through a 6kV station A section bus grid-connected switch 1-4, a low-voltage side B branch of the thermal power unit high-voltage transformer 1-3 is connected to a 6kV station B section bus 1-7 through a 6kV station B section bus grid-connected switch 1-5, a 6kV station A section load 1-10 is connected to a 6kV station A section bus 1-6 through a 6kV station A section load grid-connected switch 1-8, and a 6kV station B section load 1-11 is connected to a 6kV station B section bus 1-7 through a 6kV station B section load grid-connected switch 1-9.
According to some embodiments, the thermal power generator 1-1 is connected to a power grid system through a thermal power unit main transformer 1-2. Furthermore, the thermal power generator 1-1 can transmit power to a power grid system through a main transformer 1-2 of the thermal power unit.
According to some embodiments, the thermal power plant transformer 1-3 refers to a high-voltage station transformer connected to an outlet of the thermal power generator 1-1 and used for reducing voltage to supply power to the thermal power plant. For example, the thermal power generating unit substation 1-3 can reduce the voltage of 20kV output by the thermal power generator 1-1 to 6kV.
In some embodiments, the 6kV factory A-section bus 1-6 can supply power to the 6kV factory A-section load 1-10 by closing the 6kV factory A-section load grid-connected switch 1-8. The 6kV station B-section bus 1-7 can supply power to the 6kV station B-section load 1-11 by closing the 6kV station B-section load grid-connected switch 1-9.
In this application embodiment, 6kV factory bus includes: 6kV factory A section bus 1-6 and 6kV factory B section bus 1-7. Fig. 3 is a schematic structural diagram of a power electronic transformer SOP unit according to an embodiment of the present disclosure. As shown in fig. 3, the power electronic transformation SOP unit 2 includes: the power transmission system comprises a power transmission switch 2-1, an SOP & DC/AC converter 2-2, an SOP high-voltage side filter capacitor 2-3, a power electronic transformer isolation type DC-DC converter 2-4, an SOP low-voltage side filter capacitor 2-5 and an SOP & AC/DC converter 2-6;
the alternating current side of the SOP & DC/AC converter 2-2 is connected to a 6kV station B-section bus 1-7 through a power transmission switch 2-1, the direct current side of the SOP & DC/AC converter 2-2 is connected to the high voltage side of a power electronic transformer isolation type DC-DC converter 2-4 through an SOP high-voltage side filter capacitor 2-3, the low voltage side of the power electronic transformer isolation type DC-DC converter 2-4 is connected to the direct current side of the SOP & AC/DC converter 2-6 through an SOP low-voltage side filter capacitor 2-5, and the alternating current side of the SOP & AC/DC converter 2-6 is connected to a 400V comprehensive energy bus 3-1.
According to some embodiments, when the thermal power plant unit 1 and the optical storage microgrid unit 3 perform power transmission through the power electronic transformation SOP unit 2, the optical storage microgrid unit 3 may perform power transmission to the thermal power plant unit 1 through the power electronic transformation SOP unit 2, and the thermal power plant unit 1 may also perform power transmission to the optical storage microgrid unit 3 through the power electronic transformation SOP unit 2.
In some embodiments, when the light storage microgrid unit 3 performs power transmission to the thermal power plant unit 1 through the power electronic transformation SOP unit 2, low-voltage alternating current output by the light storage microgrid unit 3 is converted into low-voltage direct current through the SOP · AC/DC converters 2-6. And then, the low-voltage direct current is filtered by an SOP low-voltage side filter capacitor 2-5 and then is transmitted to a power electronic transformer isolated DC-DC converter 2-4. Further, the filtered low-voltage direct current is converted into high-voltage direct current by a power electronic transformer isolated DC-DC converter 2-4. And secondly, the high-voltage direct current is filtered by an SOP high-voltage side filter capacitor 2-3 and then is transmitted to an SOP DC/AC converter 2-2. Then, the filtered high-voltage direct current is inverted into a high-voltage alternating current by an SOP · DC/AC converter 2-2. And finally, the high-voltage alternating current is transmitted to a 6kV B section of factory bus 1-7 through a power transmission switch 2-1.
In some embodiments, when the thermal power plant unit 1 performs power transmission to the light storage microgrid unit 3 through the power electronic transformation SOP unit 2, high-voltage alternating current output by the thermal power plant unit 1 is transmitted to the SOP · DC/AC converter 2-2 through the power transmission switch 2-1. Then, the high-voltage alternating current is rectified into a high-voltage direct current by an SOP · DC/AC converter 2-2. And then, the high-voltage direct current is filtered by an SOP high-voltage side filter capacitor 2-3 and then transmitted to a power electronic transformer isolated DC-DC converter 2-4. Secondly, the filtered high-voltage direct current is converted into low-voltage direct current through a power electronic transformer isolated DC-DC converter 2-4. Then, the low-voltage direct current is filtered by an SOP low-voltage side filter capacitor 2-5 and then transmitted to an SOP AC/DC converter 2-6. Finally, the filtered low-voltage direct current is converted into low-voltage alternating current through an SOP & AC/DC converter 2-6 and then transmitted to a 400V comprehensive energy bus 3-1.
According to some embodiments, in the related art, each light storage microgrid unit 3 needs to be individually configured with one PCS, and then the PCS is incorporated into a thermal power 6kV station system through a step-up transformer. However, the grid-connected mode has high equipment failure rate and cannot realize flexible regulation and control, and the volume of the single light storage micro-grid unit 3 is large when the single light storage micro-grid unit is incorporated into a thermal power 6kV station system due to the huge volume of the step-up transformer.
In some embodiments, each light storage microgrid unit 3 of at least one light storage microgrid unit 3 is connected to a 6kV station bus in the thermal power plant unit 1 through a corresponding power electronic transformation (SOP) unit 2, so that a step-up transformer is not needed, the size of the single light storage microgrid unit 3 required when incorporated into a thermal power 6kV station system can be reduced, the failure rate of equipment can be reduced, and flexible regulation and control can be realized.
In some embodiments, the conventional SOP unit only comprises an SOP · DC/AC converter 2-2 and an SOP · AC/DC converter 2-6, and the power electronic transformation SOP unit 2 provided in the embodiments of the present application can realize high-frequency transformation by adding a power electronic transformer isolation type DC-DC converter 2-4 between the SOP · DC/AC converter 2-2 and the SOP · AC/DC converter 2-6, and can not need to adopt a step-up transformer, and the control mode is flexible and the power supply is reliable. In addition, compared with a boosting transformer, the power electronic transformer isolated DC-DC converter 2-4 has smaller volume and more convenient maintenance.
In some embodiments, the power electronic transformation SOP unit 2 provided by the embodiment of the present application has certain advantages in terms of power quality adjustment, harmonic suppression, and the like, and has a series of functional advantages such as voltage level transformation, electrical isolation, power adjustment and control, and the like when realizing high-frequency transformation.
In the embodiment of the application, the power electronic transformer isolation type DC-DC converter 2-4 comprises a high-frequency transformer;
and a high frequency transformer for controlling an output voltage of the high frequency transformer by controlling a frequency of the high frequency transformer.
According to some embodiments, when the high frequency transformer is used to control the output voltage of the high frequency transformer by controlling the frequency of the high frequency transformer, the output voltage of the high frequency transformer may be reduced by reducing the frequency of the high frequency transformer. The output voltage of the high frequency transformer can also be increased by increasing the frequency of the high frequency transformer.
In some embodiments, the high frequency transformer is rated at a frequency of 10kHz.
In the embodiment of the application, the SOP DC/AC converter 2-2, the power electronic transformer isolated DC-DC converter 2-4 and the SOP AC/DC converter 2-6 are all back-to-back voltage source fully-controlled power electronic devices.
Back-to-back refers to a control approach, according to some embodiments. The back-to-back feature is that of two associated devices (or two parts of one device), the control purpose of one device is to accommodate the input and the control purpose of the other device is to accommodate the output.
According to some embodiments, a fully-controlled power electronic device refers to a power electronic device which can be controlled to be turned on and off by a control signal. The devices used in the fully-controlled power electronic device include, but are not limited to, gate turn-off thyristors, power field effect transistors, insulated Gate Bipolar Transistors (IGBTs), and the like.
In some embodiments, when the sop.dc/AC converter 2-2, the power electronic transformer isolated DC-DC converter 2-4, and the sop.ac/DC converter 2-6 are back-to-back voltage source fully controlled power electronic devices, the devices employed in the sop.dc/AC converter 2-2, the power electronic transformer isolated DC-DC converter 2-4, and the sop.ac/DC converter 2-6 may be high power high frequency IGBT devices. Because the maximum short-circuit current of the high-power high-frequency IGBT component can be increased to be not more than 1.5 times of the rated current, the protection and judgment logic is simple and efficient. Therefore, the transmission efficiency and the transmission effect of the thermal power plant unit 1 and the light storage micro-grid unit 3 during power transmission through the power electronic transformation SOP unit 2 can be improved.
In the embodiment of the application, the SOP.DC/AC converter 2-2 and the SOP.AC/DC converter 2-6 have a four-quadrant power control function, and the power response time corresponding to the four-quadrant power control function is in millisecond level;
when the thermal power plant unit 1 and the light storage micro-grid unit 3 transmit power through the power electronic transformation SOP unit 2, power transmission is performed in a power four-quadrant operation mode.
According to some embodiments, a four quadrant power control function refers to a function that controls power of four quadrants, namely, a positive voltage positive current (first quadrant), a negative voltage positive current (second quadrant), a negative voltage negative current (third quadrant), and a positive voltage negative current (fourth quadrant).
In some embodiments, the power four-quadrant operation mode refers to a mode of power transmission through a four-quadrant power control function provided by the SOP · DC/AC converters 2-2 and 2-6.
In the embodiment of the present application, the SOP · DC/AC converter 2-2 employs a reactive power control method and a constant direct current voltage control method, and the SOP · AC/DC converter 2-6 employs a reactive power control method and a constant alternating current side voltage control method.
In the embodiment of the application, when the SOP DC/AC converter 2-2, the power electronic transformer isolated DC-DC converter 2-4 and the SOP AC/DC converter 2-6 work, the power supply system operates according to the preset power factor according to the real-time power regulation requirement of the power load.
According to some embodiments, the constant ac side voltage control mode refers to a control mode that controls only the magnitude of the ac side voltage.
According to some embodiments, the constant dc voltage control mode refers to a control mode that only controls the magnitude of the dc side voltage.
According to some embodiments, the reactive power control mode refers to the control of the exchange of reactive power between the converter or the hvdc converter station and the ac grid connected thereto.
According to some embodiments, the Power Factor (PF), also called power factor, is a physical quantity specific to an ac power system, and is a ratio of the effective power consumed by a load to the apparent power thereof, and is a dimensionless quantity between 0 and 1.
In some embodiments, unit power factor operation may also be achieved when the SOP DC/AC converters 2-2, the power electronic transformer isolated DC-DC converters 2-4, and the SOP AC/DC converters 2-6 are in operation.
In some embodiments, unity power factor refers to the power factor when the power factor is equal to 1.
In the embodiment of the present application, fig. 4 is a schematic structural diagram of an optical storage grid-connected plant system using power electronic transformation SOP provided in the embodiment of the present application. As shown in fig. 4, the optical storage grid-connected plant system further includes an optical storage microgrid control center 4;
and the light storage micro-grid control center 4 is used for controlling the power transmission size, the power transmission form and the power transmission direction of the power electronic transformation SOP unit 2.
In the embodiment of the present application, fig. 5 is a schematic structural diagram of a light storage microgrid unit provided in the embodiment of the present application. As shown in fig. 5, the light storage microgrid unit 3 further includes: the photovoltaic grid-connected system comprises 3-2 parts of a photovoltaic power generation system grid-connected switch, 3-3 parts of a photovoltaic inverter, 3-4 parts of a photovoltaic panel, 3-5 parts of an energy storage system grid-connected switch, 3-6 parts of an energy storage system PCS, 3-7 parts of an energy storage element, 3-8 parts of a comprehensive energy load grid-connected switch and 3-9 parts of a comprehensive energy load;
the photovoltaic panel 3-4 is connected to a 400V comprehensive energy bus 3-1 through a photovoltaic inverter 3-3 and a photovoltaic power generation system grid-connected switch 3-2, the energy storage element 3-7 is connected to the 400V comprehensive energy bus 3-1 through an energy storage system PCS3-6 and an energy storage system grid-connected switch 3-5, and the comprehensive energy load 3-9 is connected to the 400V comprehensive energy bus 3-1 through a comprehensive energy load grid-connected switch 3-8.
According to some embodiments, when the light storage micro-grid unit 3 operates normally, light energy can be converted into electric energy through the photovoltaic panels 3-4, so that photovoltaic power is transmitted to the thermal power plant unit 1 in a reverse mode, the plant power consumption rate can be reduced, and the economic benefit of the thermal power generating unit can be improved.
In some embodiments, the energy storage elements 3-7 may discharge and supply power to the integrated energy loads 3-9 in the event of insufficient light or at night. When the electric energy of the energy storage elements 3-7 is insufficient, the thermal power plant unit 1 can supply power to the comprehensive energy loads 3-9 through the power electronic transformation SOP unit 2.
According to some embodiments, the energy storage elements 3-7 refer to power sources that can be flexibly charged and discharged. The energy storage elements 3 to 7 can realize dynamic energy absorption and release in the optical storage microgrid unit 3, and have the advantages of quick response and flexible control, and no substitution in maintaining the grid-side frequency stability of the optical storage microgrid unit 3.
In some embodiments, when the energy storage elements 3-7 are installed, the energy storage elements 3-7 may be connected to the dc side of the grid-connected inverter at the distributed power supply point to serve as a basis for adjusting the load.
To sum up, the system for grid-connected optical storage and plant that adopts power electronics vary voltage SOP that this application embodiment provided includes: the system comprises a thermal power plant unit 1, a power electronic transformation SOP unit 2 and a light storage micro-grid unit 3; the thermal power plant unit 1 comprises a 6kV plant bus and is used for carrying out power transmission on a power grid system; the light storage micro-grid unit 3 comprises a 400V comprehensive energy bus 3-1 and is used for carrying out power transmission on the thermal power plant unit 1 through a power electronic transformation (SOP) unit 2; the high-voltage side of the power electronic transformation SOP unit 2 is connected to a 6kV station bus, the low-voltage side of the power electronic transformation SOP unit 2 is connected to a 400V comprehensive energy bus 3-1, and the power electronic transformation SOP unit is used for providing a power transmission channel when the thermal power station unit 1 and the light storage micro-grid unit 3 carry out power transmission. This application is through storing up light little electric wire netting unit 3 and power electronics vary voltage SOP unit 2 and incorporate into thermal power plant with high-pressure bus system as a part of flexible distribution network, can not surpass the original design capacity of thermal power unit for original plant bus, consequently can need not to expand the interval. In addition, the light storage micro-grid unit 3 is connected with the thermal power plant unit 1 through the power electronic transformation SOP unit 2, so that the increase of equipment in the thermal power plant high-voltage bus system when the light storage micro-grid unit 3 is incorporated into the thermal power plant high-voltage bus system can be reduced, and the equipment failure rate can be further reduced. And, light stores up little grid element 3 and thermal power plant with unit 1 through power electronics vary voltage SOP unit 2 and is connected, can also reduce the short-circuit current after the access large capacity load, and then can reduce the degree of reforming transform to equipment in the thermal power plant with high-voltage bus system. And the control mode of the optical storage grid-connected plant system adopting the power electronic transformation SOP is flexible and the power supply reliability is high.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified.
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 specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations 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.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following technologies, which are well known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer-readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
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 do not necessarily 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.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are exemplary and should not be construed as limiting the present application and that changes, modifications, substitutions and alterations in the above embodiments may be made by those of ordinary skill in the art within the scope of the present application.
Claims (8)
1. The utility model provides an adopt light of power electronics vary voltage SOP to store up and be incorporated into power networks factory and use system which characterized in that includes: the system comprises a thermal power plant unit, a power electronic transformation SOP unit and a light storage micro-grid unit;
the thermal power plant unit comprises a 6kV plant bus and is used for carrying out power transmission on a power grid system;
the light storage micro-grid unit comprises a 400V comprehensive energy bus and is used for carrying out power transmission on the thermal power plant unit through a power electronic transformation (SOP) unit;
the high-voltage side of the power electronic transformation SOP unit is connected to the 6kV station bus, and the low-voltage side of the power electronic transformation SOP unit is connected to the 400V comprehensive energy bus and used for providing a power transmission channel when the thermal power station unit and the light storage micro-grid unit carry out power transmission;
the 6kV factory bus comprises: 6kV mill with A section generating line and 6kV mill with B section generating line, power electronics vary voltage SOP unit includes: the power transmission system comprises a power transmission switch, an SOP & DC/AC converter, an SOP high-voltage side filter capacitor, a power electronic transformer isolation type DC-DC converter, an SOP low-voltage side filter capacitor and an SOP & AC/DC converter;
wherein the alternating current side of the SOP DC/AC converter is connected to the 6kV station B bus through the power transmission switch, the direct current side of the SOP DC/AC converter is connected to the high voltage side of the power electronic transformer isolated DC-DC converter through the SOP high voltage side filter capacitor, the low voltage side of the power electronic transformer isolated DC-DC converter is connected to the direct current side of the SOP AC/DC converter through the SOP low voltage side filter capacitor, and the alternating current side of the SOP AC/DC converter is connected to the 400V integrated energy bus;
the light stores up little electric wire netting unit still includes: the system comprises a photovoltaic power generation system grid-connected switch, a photovoltaic inverter, a photovoltaic panel, an energy storage system grid-connected switch, an energy storage system PCS, an energy storage element, a comprehensive energy load grid-connected switch and a comprehensive energy load;
the photovoltaic panel is connected to the 400V comprehensive energy bus through the photovoltaic inverter and the photovoltaic power generation system grid-connected switch, the energy storage element is connected to the 400V comprehensive energy bus through the energy storage system PCS and the energy storage system grid-connected switch, and the comprehensive energy load is connected to the 400V comprehensive energy bus through the comprehensive energy load grid-connected switch.
2. The optical storage grid-connected plant system adopting power electronic transformation (SOP) of claim 1, wherein the 6kV plant bus comprises: 6kV mill is with A section generating line and 6kV mill is with B section generating line, thermal power plant still includes with the unit: the system comprises a thermal power generator, a thermal power unit main transformer, a thermal power unit high-voltage substation, a 6kV factory A-section bus grid-connected switch, a 6kV factory B-section bus grid-connected switch, a 6kV factory A-section load grid-connected switch, a 6kV factory B-section load grid-connected switch, a 6kV factory A-section load and a 6kV factory B-section load;
wherein, thermal power generator is connected to thermal power unit owner become with the high pressure side that thermal power unit high plant becomes, the low pressure side A branch that thermal power unit high plant becomes passes through 6kV plant is with A section generating line grid-connected switch and is connected to 6kV plant is with A section generating line, the low pressure side B branch that thermal power unit high plant becomes passes through 6kV plant is with B section generating line grid-connected switch and is connected to 6kV plant is with B section generating line, 6kV plant is with A section load and passes through 6kV plant is with A section load grid-connected switch and is connected to 6kV plant is with A section generating line, 6kV plant is with B section load and passes through 6kV plant is with B section load grid-connected switch and is connected to 6kV plant is with B section generating line.
3. The grid-connected optical storage system employing power electronics transformation (SOP) of claim 1, wherein the power electronics transformer isolated DC-DC converter comprises a high frequency transformer;
the high frequency transformer is used for controlling the output voltage of the high frequency transformer by controlling the frequency of the high frequency transformer.
4. The grid-connected optical storage system employing power electronics transformation (SOP) of claim 1, wherein the SOP DC/AC converter, the power electronics transformer isolated DC-DC converter and the SOP AC/DC converter are back-to-back voltage source fully controlled power electronics devices.
5. The grid-connected optical storage system adopting power electronic transformation (SOP) of claim 1, wherein the SOP DC/AC converter and the SOP AC/DC converter have a four-quadrant power control function, and the power response time corresponding to the four-quadrant power control function is in millisecond level;
when the thermal power plant unit and the light storage micro-grid unit transmit power through the power electronic transformation SOP unit, power transmission is performed in a power four-quadrant operation mode.
6. The grid-connected optical storage system using power electronic transformation (SOP) according to claim 1, wherein the SOP-DC/AC converter adopts a reactive power control mode and a constant direct current voltage control mode, and the SOP-AC/DC converter adopts a reactive power control mode and a constant alternating current side voltage control mode.
7. The grid-connected optical storage system adopting power electronic transformation (SOP) of claim 1, wherein the SOP DC/AC converter, the power electronic transformer isolated DC-DC converter and the SOP AC/DC converter operate according to real-time power regulation requirements of electric loads and according to preset power factors.
8. The grid-connected optical storage system adopting power electronic transformation (SOP) as claimed in claim 1, further comprising an optical storage micro grid control center;
the light storage micro-grid control center is used for controlling the power transmission size, the power transmission form and the power transmission direction of the power electronic transformation SOP unit.
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| CN202210747862.5A CN114825450B (en) | 2022-06-29 | 2022-06-29 | Light storage grid-connected plant system adopting power electronic transformation SOP |
| PCT/CN2023/098111 WO2024001674A1 (en) | 2022-06-29 | 2023-06-02 | Photovoltaic storage flexible grid-connected system and method |
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| CN114825450B (en) * | 2022-06-29 | 2022-11-04 | 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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| CN105811456A (en) * | 2016-03-24 | 2016-07-27 | 中国电力科学研究院 | Power electronic transformer based microgrid intelligent gateway system and control method therefor |
| CN114123269A (en) * | 2021-12-17 | 2022-03-01 | 华能武汉发电有限责任公司 | Thermal power energy storage system adopting power electronic transformer |
| CN216851315U (en) * | 2022-02-17 | 2022-06-28 | 华能洋浦热电有限公司 | Boosting combined thermal power system |
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| WO2018193395A1 (en) * | 2017-04-19 | 2018-10-25 | Abb Schweiz Ag | A system and a method for providing uninterrupted power in a microgrid system |
| CN114123268A (en) * | 2021-12-17 | 2022-03-01 | 华能武汉发电有限责任公司 | Concentrated conversion high-frequency boosting thermal power energy storage system |
| CN114421604A (en) * | 2022-01-14 | 2022-04-29 | 华能海南发电股份有限公司海口电厂 | GIS voltage reduction integrated system for thermal power plant |
| CN114825450B (en) * | 2022-06-29 | 2022-11-04 | 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 |
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| CN105811456A (en) * | 2016-03-24 | 2016-07-27 | 中国电力科学研究院 | Power electronic transformer based microgrid intelligent gateway system and control method therefor |
| CN114123269A (en) * | 2021-12-17 | 2022-03-01 | 华能武汉发电有限责任公司 | Thermal power energy storage system adopting power electronic transformer |
| CN216851315U (en) * | 2022-02-17 | 2022-06-28 | 华能洋浦热电有限公司 | Boosting combined thermal power system |
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