WO2024001674A1 - Système connecté au réseau flexible à stockage photovoltaïque et procédé - Google Patents

Système connecté au réseau flexible à stockage photovoltaïque et procédé Download PDF

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Publication number
WO2024001674A1
WO2024001674A1 PCT/CN2023/098111 CN2023098111W WO2024001674A1 WO 2024001674 A1 WO2024001674 A1 WO 2024001674A1 CN 2023098111 W CN2023098111 W CN 2023098111W WO 2024001674 A1 WO2024001674 A1 WO 2024001674A1
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WO
WIPO (PCT)
Prior art keywords
power
sop
unit
factory
converter
Prior art date
Application number
PCT/CN2023/098111
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English (en)
Chinese (zh)
Inventor
王绍民
林松青
薛晓峰
潘喜良
曾垂栋
杜武荣
徐挺进
姜滨
梁晓斌
张宗祯
葛传军
常云潇
杨沛豪
兀鹏越
寇水潮
王小辉
燕云飞
郭昊
殷悦
李志鹏
张立松
王劼文
代本谦
李菁华
Original Assignee
华能罗源发电有限责任公司
西安热工研究院有限公司
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Publication date
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Publication of WO2024001674A1 publication Critical patent/WO2024001674A1/fr

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Classifications

    • 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
    • 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
    • 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
    • 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
    • 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
    • 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

Definitions

  • the present disclosure relates to the field of power transmission technology, and specifically to an optical storage flexible grid connection system and method.
  • Embodiments of the present disclosure provide a flexible optical storage grid-connected system and method.
  • the main purpose is to provide an optical storage grid-connected factory system with low equipment failure rate, flexible control method and high power supply reliability.
  • a flexible grid-connected system for photovoltaic and storage including: a thermal power plant unit, a power electronics transformer SOP unit and a photovoltaic and storage microgrid unit;
  • the thermal power plant unit includes a 6kV factory busbar, which is used for power transmission to the power grid system;
  • the photovoltaic storage microgrid unit includes a 400V integrated energy bus for power transmission to the thermal power plant unit through a power electronics transformer SOP unit;
  • the high-voltage side of the power electronic transformation SOP unit is connected to the 6kV factory bus, and the low-voltage side of the power electronic transformation SOP unit is connected to the 400V comprehensive energy bus for use in the thermal power plant.
  • a power transmission channel is provided;
  • the 6kV factory busbar includes: 6kV factory A-section busbar and 6kV factory B-section busbar.
  • the power electronic transformation SOP unit includes: power transmission switch, SOP ⁇ DC/AC converter, SOP high-voltage side filter capacitor , Power electronic transformer isolation DC-DC converter, SOP low-voltage side filter capacitor, SOP ⁇ AC/DC converter;
  • the AC side of the SOP ⁇ DC/AC converter is connected to the 6kV factory through the power transmission switch.
  • Section B busbar the DC side of the SOP DC/AC converter is connected to the high voltage side of the power electronic transformer isolation type DC-DC converter through the SOP high voltage side filter capacitor.
  • the power electronic transformer isolation type The low-voltage side of the DC-DC converter is connected to the DC side of the SOP ⁇ AC/DC converter through the SOP low-voltage side filter capacitor, and the AC side of the SOP ⁇ AC/DC converter is connected to the 400V Integrated energy bus;
  • the photovoltaic storage microgrid unit also includes: photovoltaic power generation system grid-connected switch, photovoltaic inverter, photovoltaic panel, energy storage system grid-connected switch, energy storage system PCS, energy storage components, integrated energy load grid-connected switch and integrated energy load;
  • the photovoltaic panel is connected to the 400V comprehensive energy bus through the photovoltaic inverter and the photovoltaic power generation system grid connection switch, and the energy storage element is connected through the energy storage system PCS and the energy storage system.
  • the grid switch is connected to the 400V integrated energy bus, and the integrated energy load is connected to the 400V integrated energy bus through the integrated energy load grid-connected switch.
  • the 6kV factory busbar includes: a 6kV factory A-section busbar and a 6kV factory B-section busbar;
  • the thermal power plant unit also includes: a thermal power generator, a thermal power unit main transformer, High power plant transformer for thermal power units, 6kV plant section A busbar grid-connected switch, 6kV plant section B busbar grid-connected switch, 6kV plant section A load grid-connected switch, 6kV plant section B load grid-connected switch, 6kV plant section A load grid-connected switch Section load and 6kV factory B section load;
  • the thermal power generator is connected to the main transformer of the thermal power unit and the high-voltage side of the high-voltage transformer of the thermal power unit.
  • the low-voltage side A branch of the high-voltage transformer of the thermal power unit is connected to the grid through the 6kV factory A-section busbar.
  • the switch is connected to the 6kV factory A-section bus, and the low-voltage side B branch of the high-power transformer of the thermal power unit is connected to the 6kV factory B-section bus through the 6kV factory B-section bus grid connection switch.
  • the 6kV factory A-section load is connected to the 6kV factory A-section busbar through the 6kV factory A-section load grid-connected switch, and the 6kV factory B-section load is connected to the 6kV factory B-section load grid-connected switch.
  • the 6kV factory B section busbar is connected to the 6kV factory A-section busbar.
  • the power electronic transformer isolated DC-DC converter includes a high frequency transformer
  • 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 SOP ⁇ DC/AC converter, the power electronic transformer isolated DC-DC converter and the SOP ⁇ AC/DC converter are all fully controlled by back-to-back voltage sources. type power electronic device.
  • the SOP ⁇ DC/AC converter and the SOP ⁇ AC/DC converter are equipped with a four-quadrant power control function, and the power response time corresponding to the four-quadrant power control function is millisecond level;
  • the thermal power plant unit and the optical storage microgrid unit perform power transmission through the power electronic transformation SOP unit, the power transmission is performed through the power four-quadrant operation mode.
  • the SOP ⁇ DC/AC converter adopts a reactive power control method and a constant DC voltage control method
  • the SOP ⁇ AC/DC converter adopts a reactive power control method and a constant DC voltage control method. AC side voltage control method.
  • the Real-time power adjustment requirements when the SOP ⁇ DC/AC converter, the power electronic transformer isolated DC-DC converter and the SOP ⁇ AC/DC converter operate, the Real-time power adjustment requirements, operating according to the preset power factor.
  • it also includes a light storage microgrid control center
  • the optical storage microgrid control center is used to control the power transmission size, power transmission form and power transmission direction of the power electronic transformer SOP unit.
  • the flexible grid-connected optical and storage system proposed in one aspect of the present disclosure includes: a thermal power plant unit, a power electronics transformation SOP unit and an optical storage microgrid unit;
  • the thermal power plant unit includes a 6kV factory busbar , used for power transmission to the power grid system;
  • the photovoltaic storage microgrid unit includes a 400V integrated energy bus, used for power transmission to the unit of the thermal power plant through a power electronics transformation SOP unit;
  • the power electronics transformation The high-voltage side of the SOP unit is connected to the 6kV factory bus, and the low-voltage side of the power electronic transformation SOP unit is connected to the 400V comprehensive energy bus for use in the thermal power plant unit and the optical storage unit.
  • the 6kV factory bus includes: 6kV factory A-section bus and 6kV factory B-section bus
  • the power electronic transformation SOP unit includes: power transmission switch, SOP ⁇ DC/AC converter, SOP high-voltage side filter capacitor, power electronic transformer isolated DC-DC converter, SOP low-voltage side filter capacitor, SOP ⁇ AC/DC converter;
  • the AC side of the SOP ⁇ DC/AC converter is connected to the 6kV factory B section busbar through the power transmission switch, and the DC side of the SOP ⁇ DC/AC converter is connected to the SOP high voltage
  • the side filter capacitor is connected to the high-voltage side of the power electronic transformer isolated DC-DC converter, and the low-voltage side of the power electronic transformer isolated DC-DC converter is connected to the SOP through the SOP low-voltage side filter capacitor.
  • the DC side of the AC/DC converter, the AC side of the SOP ⁇ AC/DC converter is connected to the 400V comprehensive energy bus;
  • the photovoltaic storage microgrid unit also includes: photovoltaic power generation system grid-connected switch, photovoltaic inverter, photovoltaic panel, energy storage system grid-connected switch, energy storage system PCS, energy storage components, integrated energy load grid-connected switch and integrated energy load;
  • the photovoltaic panel is connected to the 400V comprehensive energy bus through the photovoltaic inverter and the photovoltaic power generation system grid connection switch, and the energy storage element is connected through the energy storage system PCS and the energy storage system.
  • the grid switch is connected to the 400V integrated energy bus, and the integrated energy load is connected to the 400V integrated energy bus through the integrated energy load grid-connected switch.
  • This disclosure integrates the photovoltaic storage microgrid unit and the power electronic transformer SOP unit as part of the flexible distribution network into the high-voltage bus system for thermal power plants, which will not exceed the original design capacity of the original bus bar for thermal power units, and therefore does not require extended interval.
  • the power electronics transformer SOP unit is used to connect the optical storage microgrid unit to the thermal power plant unit, which can reduce the increase in the thermal power plant high-voltage bus system when the optical storage microgrid unit is integrated into the thermal power plant high-voltage bus system. equipment, thereby reducing equipment failure rates.
  • the power electronics transformer SOP unit is used to connect the photovoltaic storage microgrid unit to the thermal power plant unit, which can also reduce the short-circuit current after connecting to a large-capacity load, thereby enabling In order to reduce the degree of modification of equipment in the high-voltage busbar system of thermal power plants.
  • the optical storage flexible grid-connected system has flexible control methods and high power supply reliability.
  • Figure 1 is a schematic structural diagram of an optical storage flexible grid-connected system provided by an embodiment of the present disclosure
  • Figure 2 is a schematic structural diagram of a unit for a thermal power plant provided by an embodiment of the present disclosure
  • Figure 3 is a schematic structural diagram of a power electronic transformer SOP unit provided by an embodiment of the present disclosure
  • Figure 4 is a schematic structural diagram of an optical storage flexible grid-connected system provided by an embodiment of the present disclosure
  • FIG. 5 is a schematic structural diagram of a light-storage microgrid unit provided by an embodiment of the present disclosure.
  • 1 unit for thermal power plant
  • 2 power electronics transformer SOP unit
  • 3 solar and storage microgrid unit
  • 4 solar and storage microgrid control center
  • 3-1 400V comprehensive energy bus
  • 3-2 Photovoltaic power generation system grid connection switch
  • 3-3 Photovoltaic inverter
  • 3-4 Photovoltaic panels
  • 3-5 Energy storage system grid connection switch
  • 3-6 Energy storage system PCS
  • 3-7 Energy storage components
  • 3-8 Comprehensive energy load grid connection switch
  • 3-9 Comprehensive energy load.
  • Figure 1 is a schematic structural diagram of an optical storage flexible grid-connected system provided by an embodiment of the present disclosure.
  • an embodiment of the present disclosure provides a flexible grid-connected system for light and storage, including: a thermal power plant unit 1, a power electronics transformation SOP unit 2, and a light and storage microgrid unit 3;
  • the thermal power plant unit 1 includes a 6kV factory busbar, which is used for power transmission to the power grid system;
  • the photovoltaic storage microgrid unit 3 includes a 400V integrated energy bus 3-1, which is used to transmit power to the thermal power plant unit 1 through the power electronic transformation SOP unit 2;
  • the high-voltage side of the power electronic transformation SOP unit 2 is connected to the 6kV factory bus, and the low-voltage side of the power electronic transformation SOP unit 2 is connected to the 400V integrated energy bus 3-1, which is used for unit 1 in thermal power plants and optical storage microgrids.
  • unit 3 When unit 3 performs power transmission, it provides a power transmission channel.
  • distribution networks transformed using flexible power electronics technology are an important trend and can effectively solve some bottleneck problems in the development of traditional distribution networks.
  • Advanced power electronics technology can build a flexible, reliable, and efficient distribution network, which can not only improve the power quality, reliability, and operating efficiency of the distribution system, but also cope with the volatility of traditional loads and proportional renewable energy.
  • the embodiments of the present disclosure can not only improve the reliability of the plant system by integrating the photovoltaic storage microgrid unit 3 and the power electronic transformation SOP unit 2 into the thermal power plant as part of the flexible distribution network, It can also improve the economics and scalability of photovoltaic and integrated energy load access, and separate traditional power generation from diversified operations.
  • integrating the photovoltaic storage microgrid unit 3 and the power electronic transformer SOP unit 2 as part of the flexible distribution network into the high-voltage bus system of the thermal power plant will not exceed the original design capacity of the thermal power unit's original bus bar and does not require expansion. interval.
  • the built photovoltaic power generation device can be directly connected to the factory power system. Therefore, when the photovoltaic storage microgrid unit 3 is incorporated into the high-voltage bus system for thermal power plants, the equipment added to the high-voltage bus system for thermal power plants can be reduced, thereby reducing the equipment failure rate, thereby improving the economic benefits of thermal power units and coal-fired power enterprises. .
  • FIG. 2 is a schematic structural diagram of a unit for a thermal power plant provided by the embodiment of the present disclosure.
  • the 6kV factory busbar includes: 6kV factory A-section busbar 1-6 and 6kV factory B-section busbar 1-7.
  • the thermal power plant unit 1 also includes: thermal power generator 1-1, thermal power unit Main transformer 1-2, thermal power unit high plant transformer 1-3, 6kV plant section A bus grid-connected switch 1-4, 6kV plant section B busbar grid-connected switch 1-5, 6kV plant section A load grid-connected switch 1-8, 6kV factory B section load grid connection switch 1-9, 6kV factory A section load 1-10 and 6kV factory B section load 1-11;
  • the thermal power generator 1-1 is connected to the high-voltage side of the thermal power unit main transformer 1-2 and the thermal power unit high-voltage transformer 1-3.
  • the low-voltage side A branch of the thermal power unit high-voltage transformer 1-3 passes through the 6kV factory A-section busbar.
  • the grid-connected switch 1-4 is connected to the 6kV factory A-section busbar 1-6.
  • the low-voltage side B branch of the thermal power unit high-voltage transformer 1-3 is connected to the 6kV factory B-side through the 6kV factory B-section busbar grid-connected switch 1-5.
  • Section buses 1-7, 6kV factory A section loads 1-10 are connected to the 6kV factory A section busbars 1-6 through the 6kV factory A section load grid connection switch 1-8, and 6kV factory B section loads 1-11 pass through
  • the 6kV factory B section load grid-connected switch 1-9 is connected to the 6kV factory B section busbar 1-7.
  • the thermal power generator 1-1 is connected to the power grid system through the thermal power unit main transformer 1-2. Furthermore, the thermal power generator 1-1 can transmit power to the power grid system through the thermal power unit main transformer 1-2.
  • the high-voltage factory transformer 1-3 of the thermal power unit refers to a high-voltage factory transformer connected to the outlet of the thermal power generator 1-1 and used to step down the voltage and supply power to the thermal power plant itself.
  • the high-voltage transformer 1-3 of the thermal power unit can reduce the 20kV voltage output by the thermal power generator 1-1 to 6kV.
  • the 6kV factory A-section busbar 1-6 can supply power to the 6kV factory A-section load 1-10.
  • the 6kV factory B section busbar 1-7 can supply power to the 6kV factory B section load 1-11.
  • the 6kV factory busbar includes: 6kV factory A-section busbar 1-6 and 6kV factory B-section busbar 1-7.
  • FIG. 3 is a schematic structural diagram of a power electronic transformer SOP unit provided by an embodiment of the present disclosure.
  • the power electronic transformer SOP unit 2 includes: power transmission switch 2-1, SOP ⁇ DC/AC converter 2-2, SOP high-voltage side filter capacitor 2-3, power electronic transformer isolation type DC- DC converter 2-4, SOP low-voltage side filter capacitor 2-5, SOP ⁇ AC/DC converter 2-6;
  • the AC side of the SOP ⁇ DC/AC converter 2-2 is connected to the 6kV factory B section bus 1-7 through the power transmission switch 2-1, and the DC side of the SOP ⁇ DC/AC converter 2-2 passes through
  • the SOP high-voltage side filter capacitor 2-3 is connected to the high-voltage side of the power electronic transformer isolated DC-DC converter 2-4, and the low-voltage side of the power electronic transformer isolated DC-DC converter 2-4 passes through the SOP low-voltage side filter capacitor 2 -5 is connected to the DC side of the SOP ⁇ AC/DC converter 2-6, and the AC side of the SOP ⁇ AC/DC converter 2-6 is connected to the 400V integrated energy bus 3-1.
  • the photovoltaic storage microgrid unit 3 may transmit power to the thermal power plant through the power electronic transformation SOP unit 2.
  • the thermal power plant unit 1 can also transmit power to the optical storage microgrid unit 3 through the power electronic transformation SOP unit 2.
  • the low-voltage AC power output by the light-storage microgrid unit 3 is converted through the SOP ⁇ AC/DC.
  • Current converter 2-6 converts it into low voltage direct current.
  • the low-voltage direct current is filtered by the SOP low-voltage side filter capacitor 2-5 and then transmitted to Power electronic transformer isolated DC-DC converter 2-4.
  • the filtered low-voltage direct current is converted into high-voltage direct current through the power electronic transformer isolation DC-DC converter 2-4.
  • the high-voltage direct current is filtered by the SOP high-voltage side filter capacitor 2-3 and then transmitted to the SOP ⁇ DC/AC converter 2-2. Then, the filtered high-voltage direct current is inverted into high-voltage alternating current through the SOP ⁇ DC/AC converter 2-2. Finally, the high-voltage alternating current is transmitted to the 6kV factory B section busbar 1-7 through the power transmission switch 2-1.
  • the high-voltage alternating current output by the thermal power plant unit 1 passes through the power transmission switch 2-1 Transmit to SOP ⁇ DC/AC converter 2-2.
  • the high-voltage alternating current is rectified into high-voltage direct current by the SOP ⁇ DC/AC converter 2-2.
  • the high-voltage direct current is filtered by the SOP high-voltage side filter capacitor 2-3 and then transmitted to the power electronic transformer isolation DC-DC converter 2-4.
  • the filtered high-voltage direct current is converted into low-voltage direct current through the power electronic transformer isolation DC-DC converter 2-4.
  • the low-voltage direct current is filtered by the SOP low-voltage side filter capacitor 2-5 and then transmitted to the SOP ⁇ AC/DC converter 2-6. Finally, the filtered low-voltage direct current is converted into low-voltage alternating current through the SOP ⁇ AC/DC converter 2-6 and then transmitted to the 400V integrated energy bus 3-1.
  • each light-storage microgrid unit 3 needs to be configured with a separate PCS, and then incorporated into the thermal power 6kV factory system through a step-up transformer.
  • the equipment failure rate of this grid-connected method is high and flexible regulation cannot be achieved.
  • a single photovoltaic storage microgrid unit 3 requires a large volume when integrated into a thermal power 6kV factory system.
  • the embodiment of the present disclosure connects each of the at least one photovoltaic and storage microgrid units 3 to the 6kV in the thermal power plant unit 1 through the corresponding power electronic transformation SOP unit 2
  • the factory busbar eliminates the need for a step-up transformer, thereby reducing the volume required when a single photovoltaic storage microgrid unit 3 is integrated into a thermal power 6kV factory system, reducing equipment failure rates, and enabling flexible regulation.
  • the traditional SOP unit only includes the SOP ⁇ DC/AC converter 2-2 and the SOP ⁇ AC/DC converter 2-6.
  • the power electronic transformation SOP unit 2 provided by the embodiment of the present disclosure adopts A power electronic transformer isolation DC-DC converter 2-4 is added between the SOP ⁇ DC/AC converter 2-2 and the SOP ⁇ AC/DC converter 2-6 to achieve high-frequency voltage transformation without the need for Step-up transformer, flexible control method and reliable power supply.
  • the power electronic transformer isolation DC-DC converter 2-4 is smaller and more convenient to maintain.
  • the power electronic transformation SOP unit 2 provided by the embodiment of the present disclosure has certain advantages in power quality adjustment and harmonic suppression when realizing high-frequency transformation, and has the functions of voltage level conversion, electrical isolation, A series of functional advantages such as power adjustment and control.
  • the power electronic transformer isolated DC-DC converter 2-4 includes a high-frequency transformer
  • a 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 high-frequency transformer is used to control the frequency of the high-frequency transformer by controlling the frequency of the high-frequency transformer.
  • the output voltage of the high-frequency transformer can 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.
  • the high frequency transformer is rated at 10 kHz.
  • 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 full-circuit converters. Controlled power electronic devices.
  • back-to-back refers to a control method.
  • the characteristic of back-to-back is that among two associated devices (or two parts of one device), the control purpose of one device is to adapt to the input, and the control purpose of the other device is to adapt to the output.
  • a fully controlled power electronic device refers to a power electronic device that can be controlled to be turned on and turned off through a control signal.
  • Devices used in fully controlled power electronic devices include, but are not limited to, gate turn-off thyristors, power field effect transistors, insulated gate bipolar transistors (IGBT), etc.
  • the back-to-back voltage source full
  • the devices used in controlled power electronic devices, SOP ⁇ DC/AC converter 2-2, power electronic transformer isolated DC-DC converter 2-4 and SOP ⁇ AC/DC converter 2-6 can be High power and high frequency IGBT components. Since the maximum short-circuit current that high-power high-frequency IGBT components can increase does not exceed 1.5 times its rated current, the protection judgment logic is simple and efficient. Therefore, the transmission efficiency and transmission effect when the thermal power plant unit 1 and the photovoltaic storage microgrid unit 3 transmit power through the power electronic transformation SOP unit 2 can be improved.
  • 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 milliseconds. ;
  • the thermal power plant unit 1 and the photovoltaic storage microgrid unit 3 transmit power through the power electronic transformer SOP unit 2, the power is transmitted through the power four-quadrant operation mode.
  • the four-quadrant power control function refers to having the ability to control positive voltage and current (first quadrant), negative voltage and current (second quadrant), negative voltage and negative current (third quadrant), and positive voltage and negative current ( The fourth quadrant) is the function of controlling the power of these four quadrants.
  • the power four-quadrant operation mode refers to the mode of power transmission through the four-quadrant power control function of the SOP ⁇ DC/AC converter 2-2 and the SOP ⁇ AC/DC converter 2-6. .
  • the SOP ⁇ DC/AC converter 2-2 adopts a reactive power control method and a constant DC voltage control method
  • the SOP ⁇ AC/DC converter 2-6 adopts a reactive power control method and a constant DC voltage control method. AC side voltage control method.
  • the fixed AC side voltage control method refers to a control method that only controls the AC side voltage.
  • the constant DC voltage control method refers to a control method that only controls the DC side voltage.
  • the reactive power control method refers to the control of reactive power exchanged between the converter or high-voltage DC converter station and the AC grid connected thereto.
  • power factor also known as power factor
  • PF is a unique physical quantity in AC power systems. It is the ratio of the effective power consumed by a load to its apparent power. It is an infinite value between 0 and 1. Dimension quantity.
  • the SOP ⁇ DC/AC converter 2-2 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 working, unit Power factor operation.
  • unity power factor refers to the power factor when the power factor is equal to 1.
  • FIG. 4 is a schematic structural diagram of an optical storage flexible grid-connected system provided by this embodiment of the present disclosure. As shown in Figure 4, the light-storage flexible grid-connected system also includes a light-storage microgrid control center 4;
  • the optical storage microgrid control center 4 is used to control the power transmission size, power transmission form and power transmission direction of the power electronic transformer SOP unit 2.
  • FIG. 5 is a schematic structural diagram of a light-storage microgrid unit provided by the embodiment of the present disclosure.
  • the photovoltaic storage microgrid unit 3 also includes: photovoltaic power generation system grid-connected switch 3-2, photovoltaic inverter 3-3, photovoltaic panel 3-4, energy storage system grid-connected switch 3-5, storage Energy system PCS3-6, energy storage components 3-7, comprehensive energy load grid connection switch 3-8 and comprehensive energy load 3-9;
  • the photovoltaic panel 3-4 is connected to the 400V comprehensive energy bus 3-1 through the photovoltaic inverter 3-3 and the photovoltaic power generation system grid-connected switch 3-2, and the energy storage element 3-7 is connected through the energy storage system PCS3-6 and the energy storage system PCS3-6.
  • the energy system grid-connected switch 3-5 is connected to the 400V integrated energy bus 3-1, and the integrated energy load 3-9 is connected to the 400V integrated energy bus 3-1 through the integrated energy load grid-connected switch 3-8.
  • the light energy when the photovoltaic storage microgrid unit 3 is operating normally, the light energy can be converted into electrical energy through the photovoltaic panels 3-4, thereby realizing the photovoltaic reverse transmission of electricity to the thermal power plant unit 1, which can reduce the power consumption rate of the plant.
  • the economic benefits of thermal power units can be improved.
  • the energy storage element 3-7 when there is insufficient light or at night, the energy storage element 3-7 can be discharged and supply power to the comprehensive energy load 3-9.
  • the thermal power plant unit 1 In response to the insufficient electric energy of the energy storage element 3-7, the thermal power plant unit 1 can supply power to the comprehensive energy load 3-9 through the power electronic transformation SOP unit 2.
  • the energy storage element 3-7 refers to a power source that can be flexibly charged and discharged.
  • Energy storage components 3-7 can dynamically absorb and release energy in the light-storage microgrid unit 3, and because of their fast response and flexible control, they are irreplaceable in maintaining grid-side frequency stability of the light-storage microgrid unit 3.
  • the energy storage element 3-7 when installing the energy storage element 3-7, can be connected to the grid of the distributed power point.
  • the DC side of the inverter serves as the basis for regulating the load.
  • the flexible solar and storage grid-connected system proposed in the embodiment of the present disclosure includes: a thermal power plant unit 1, a power electronics transformation SOP unit 2 and a solar storage microgrid unit 3;
  • the thermal power plant unit 1 includes a 6kV factory busbar , used for power transmission to the power grid system;
  • the photovoltaic storage microgrid unit 3 includes a 400V comprehensive energy bus 3-1, used for power transmission to the thermal power plant unit 1 through the power electronic transformation SOP unit 2; power electronics
  • the high-voltage side of the transformer SOP unit 2 is connected to the 6kV factory bus, and the low-voltage side of the power electronic transformer SOP unit 2 is connected to the 400V integrated energy bus 3-1, which is used in the thermal power plant unit 1 and the optical storage microgrid unit 3.
  • a power transmission channel When performing power transmission, a power transmission channel is provided.
  • This disclosure integrates the photovoltaic storage microgrid unit 3 and the power electronic transformation SOP unit 2 as part of the flexible distribution network into the high-voltage busbar system for thermal power plants, which will not exceed the original design capacity of the original busbar for thermal power units. Therefore, There is no need to extend the interval.
  • the photovoltaic storage microgrid unit 3 is connected to the thermal power plant unit 1 through the power electronic transformer SOP unit 2, which can reduce the time required to integrate the photovoltaic storage microgrid unit 3 into the thermal power plant high-voltage bus system. The additional equipment in the system can, in turn, reduce the equipment failure rate.
  • the optical storage flexible grid-connected system has flexible control methods and high power supply reliability.
  • various parts of the present disclosure may be implemented in hardware, software, firmware, or combinations thereof.
  • various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system.
  • a logic gate circuit with a logic gate circuit for implementing a logic function on a data signal.
  • Discrete logic circuits application specific integrated circuits with suitable combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), etc.
  • each functional unit in various embodiments of the present disclosure may be integrated into one processing module, each unit may exist physically alone, or two or more units may be integrated into one module.
  • the above integrated modules can be implemented in the form of hardware or software function modules. If the integrated module is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.
  • the storage media mentioned above can be read-only memory, magnetic disks or optical disks, etc.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

L'invention concerne un système connecté au réseau flexible à stockage photovoltaïque, comprenant une unité de service de centrale thermique, une unité SOP de transformation électronique de puissance et une unité de microréseau de stockage photovoltaïque. L'unité de service de centrale thermique comprend un bus de service de centrale de 6 kV et est utilisée pour transférer de la puissance à un système de réseau électrique. L'unité de microréseau de stockage photovoltaïque comprend un bus d'énergie complet de 400 V et est utilisée pour transférer de la puissance à l'unité de service de centrale thermique au moyen de l'unité SOP de transformation électronique de puissance. Un côté haute tension de l'unité SOP de transformation électronique de puissance est connecté au bus de service de centrale de 6 kV, et un côté basse tension de l'unité SOP de transformation électronique de puissance est connecté au bus d'énergie complet de 400 V, l'unité SOP de transformation électronique de puissance étant utilisée pour fournir un canal de transfert de puissance lorsque l'unité de service de centrale thermique et l'unité de microréseau de stockage photovoltaïque transfèrent de la puissance.
PCT/CN2023/098111 2022-06-29 2023-06-02 Système connecté au réseau flexible à stockage photovoltaïque et procédé WO2024001674A1 (fr)

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CN114825451B (zh) * 2022-06-29 2022-10-11 西安热工研究院有限公司 一种火电厂用光储微网柔性组网系统

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