WO2019245155A1 - Système de fonctionnement de micro-réseau autonome - Google Patents

Système de fonctionnement de micro-réseau autonome Download PDF

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Publication number
WO2019245155A1
WO2019245155A1 PCT/KR2019/005041 KR2019005041W WO2019245155A1 WO 2019245155 A1 WO2019245155 A1 WO 2019245155A1 KR 2019005041 W KR2019005041 W KR 2019005041W WO 2019245155 A1 WO2019245155 A1 WO 2019245155A1
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WO
WIPO (PCT)
Prior art keywords
power
battery
energy storage
storage device
load
Prior art date
Application number
PCT/KR2019/005041
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English (en)
Korean (ko)
Inventor
최정식
오승열
차대석
Original Assignee
전자부품연구원
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Application filed by 전자부품연구원 filed Critical 전자부품연구원
Publication of WO2019245155A1 publication Critical patent/WO2019245155A1/fr

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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
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • 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
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network
    • 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
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/10—The dispersed energy generation being of fossil origin, e.g. diesel 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
    • Y04S10/123—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving renewable energy sources
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/14—Energy storage units

Definitions

  • the present invention relates to a microgrid operating system, and more particularly, to a standalone microgrid operating system for resolving instability of a system to which a renewable energy source is applied and providing an optimal power supply system.
  • the island's independent microgrid system is a hybrid power supply system that supplies power by combining renewable energy such as solar and wind power with diesel power generation.
  • hybrid power supply systems can be a variety of combinations, including diesel-wind hybrids, diesel-solar hybrids, and diesel-wind-solar-ESS hybrids.
  • a diesel generator forms a main power source, and renewable energy and ESS systems such as solar and wind power operate in an associated mode as an auxiliary power source.
  • a hybrid power supply system in which a diesel generator forms a main power source may cause serious problems such as reverse power is applied to the diesel generator when the generating power of the renewable energy power source is higher than the load, causing the diesel generator to trip.
  • the hybrid power supply system in which the diesel generator is the main power source has low reliability because the system in the microgrid may cause a power failure when the diesel generator is shut down for fuel saving, noiseless or pollution-free operation.
  • the hybrid power supply system in which the diesel generator forms the main power source has a problem of charging at light load, discharging at heavy load, and calculating the charge / discharge amount instantaneously in order to operate the diesel generator at high efficiency.
  • the generation amount of renewable energy is higher than the load in time synchronization and time error in calculating the charge and discharge amount, reverse power may be applied to the generator to provide a cause of tripping.
  • the hybrid power supply system in which the diesel generator forms the main power has a disadvantage in that it is difficult to use 100% of the output of renewable energy in consideration of the frequency change of the diesel generator.
  • an object of the present invention is to provide an independent microgrid operating system for solving the instability of a system to which a renewable energy source is applied and providing an optimal power supply system.
  • An independent microgrid operating system is an energy storage device including a battery capable of supplying or discharging or charging a load, an inverter for controlling charging and discharging of the battery, and an auxiliary load in association with the energy storage device.
  • Renewable power generation device for supplying power to or charging the energy storage device
  • Diesel generator for supplying power to the load in conjunction with the energy storage device, or charging the energy storage device;
  • the power and load power generated from the renewable power generation device or the diesel generating device if the surplus power is present to charge the battery through the surplus power, if there is no surplus power discharges the insufficient power through the battery It characterized in that the control to.
  • the inverter is characterized in that the charge and discharge of the battery in the CVCF (Constant Voltage Constant Frequency) mode.
  • CVCF Constant Voltage Constant Frequency
  • the stand-alone microgrid operating system further comprising a PMS connected to the energy storage device, the renewable power generation device and the diesel power generation device, to control the renewable power generation device and the diesel power generation device. It features.
  • the PMS limits the output of the renewable power generation apparatus when surplus power exists when the remaining capacity of the battery exceeds a preset value.
  • the PMS is configured to control the diesel generator to operate when there is no surplus power when the remaining capacity of the battery is less than a preset value.
  • the PMS outputs an alarm signal when there is no surplus power in a state where the remaining capacity of the battery is less than a preset value.
  • the renewable energy device is characterized in that it comprises a wind turbine or a photovoltaic generator.
  • An independent microgrid operating system is an energy storage device including a battery capable of supplying or discharging or charging a load, an inverter for controlling charging and discharging of the battery, and an auxiliary load in association with the energy storage device.
  • Renewable power generation device for supplying power to or charging the energy storage device
  • Diesel generator for supplying power to the load in conjunction with the energy storage device, or charging the energy storage device;
  • the apparatus is connected in series to each other in series, and a plurality of power converters for converting and supplying power for charging and discharging, and a plurality of power converters respectively connected to the plurality of power changers to be charged with power or to supply charged power.
  • a controller configured to bypass the selected battery by controlling a power converter or a relay connected to a selected battery among the batteries
  • the stand-alone microgrid operating system forms an energy storage device as a main power source and operates the CVCF mode, thereby automatically charging and discharging the surplus power and underpower, thereby driving the PMS. It simplifies the program to do so and can reliably power the consumer.
  • the stand-alone microgrid operating system according to the present invention can solve the noise and environmental problems by minimizing the use of diesel generators by forming an energy storage device as a main power source and controlling the diesel generator device through PMS as a linked power source. .
  • the stand-alone microgrid operating system according to the present invention is connected to the power converter in series in the configuration of the energy storage device, and provided with a relay between the connection terminal of the adjacent power converter, respectively, the relay connected to the selected battery of the plurality of batteries closed state By bypassing the selected battery by controlling it, it can be replaced or repaired in the live state without stopping the system to maximize energy efficiency.
  • FIG. 1 is a block diagram showing the configuration of a standalone microgrid operating system according to the present invention.
  • FIGS 2 to 5 are views for explaining the operating state of the stand-alone microgrid operating system according to the present invention.
  • FIG. 6 is a block diagram showing the configuration of an energy storage device according to the present invention.
  • FIG. 7 is a block diagram showing in detail the configuration of the energy storage device according to the present invention.
  • FIG. 8 is a deficiency diagram for explaining in detail the configuration of an energy storage device according to the invention connected to one phase of an alternating current power source.
  • FIG. 9 is an exemplary diagram for describing bypass control for the battery selected in FIG. 8.
  • FIG. 10 is a graph illustrating a switch waveform of an inverter of an energy storage device according to a comparative example.
  • FIG. 11 is a graph illustrating a switch waveform of an inverter of an energy storage device according to an embodiment of the present invention.
  • FIGS. 2 to 5 are diagrams for describing an operating state of the standalone microgrid operating system according to the present invention.
  • the standalone microgrid operating system 200 includes an energy storage device 100, a renewable energy generation device 20, and a diesel power generation device 30.
  • the standalone microgrid operating system 200 may further include a PMS 40 for controlling the renewable power generation device 20 and the diesel power generation device 30.
  • the energy storage device 100 includes a battery 110 capable of discharging or charging by supplying power to a load, and an inverter for controlling charging and discharging of the battery 110.
  • the inverter 121 charges the battery 110 through the surplus power when surplus power exists, depending on the power generated from the renewable power generation device 20 or the diesel generator 30 and the load. If not present, the insufficient power may be discharged through the battery 110.
  • the energy storage device 100 measures the state of charge (SOC) of the battery 110, as shown in FIG. 2, and when the remaining capacity of the battery 110 is within a preset range, surplus When the output MP is present, the energy storage device 100 may be charged through the surplus output MP.
  • the remaining capacity range of the preset battery 110 may be set to 90% of the upper limit SOC_UL and 20% of the lower limit SOC_DL.
  • the surplus output MP adds the power generation amount RP of the renewable energy generation device 20 and the power generation amount D of the diesel power generation device 30, and may be calculated through a difference with the load power.
  • the energy storage device 100 measures the remaining capacity of the battery 110, and when the remaining capacity of the battery 110 is within a preset range, there is no surplus output MP. If not, it can discharge against underpower.
  • the inverter 121 may control charge and discharge of the battery 110 in a constant voltage constant frequency (CVCF) mode. That is, the energy storage device 100 according to the present invention allows the inverter to operate in a CVCF mode in which the voltage and frequency of the grid are constantly controlled, so that they can be automatically controlled individually without the control of the PMS 40 and used as a main power source. Can be.
  • CVCF constant voltage constant frequency
  • the standalone microgrid operating system 200 forms the energy storage device 100 as a main power source, and allows the energy storage device 100 to operate in a CVCF mode, thereby automatically controlling surplus power and insufficient power.
  • By charging and discharging is made, to simplify the program for driving the PMS 40, it is possible to stably supply power to the customer 60 through the transformer 50.
  • the renewable energy device 20 supplies power to the load or charges the energy storage device in an assisting manner in association with the energy storage device 100.
  • the renewable energy device 20 may include a wind turbine or a photovoltaic device.
  • the renewable energy device 20 may charge the battery 110 of the energy storage device 100 through the surplus power when surplus power exists according to the generated power and the load power.
  • the renewable energy device 20 may include an associated inverter 21, and the associated inverter 21 may be operated in an MPPT control mode and an output limit mode.
  • the diesel generator 30 is supplied in cooperation with the energy storage device 100 to supply power to the load or to charge the energy storage device. That is, the diesel generator 30 is normally stopped, but for charging the energy storage device 100 under the control of the PMS 40 according to the remaining capacity of the battery 110 and the presence of surplus power of the energy storage device 100. Can be operated or operated as a voltage source.
  • the PMS 40 may be connected to the energy storage device 100, the renewable power generation device 20, and the diesel power generation device 30 to monitor and control the renewable power generation device 20 and the diesel power generation device 30. have.
  • each output limit may be adjusted as in Equation 1 below.
  • Wind power limit (WLP) W * (1-MP / RP) * 100 / wind capacity
  • PV output limit (PLP) P * (1-MP / RP) * 100 / solar capacity
  • the PMS 40 turns off the diesel generator 30. Control to operate.
  • the PMS 40 may output an alarm signal when there is no surplus power in a state where the remaining capacity of the battery 110 is less than a preset value.
  • the alarm signal may be an alarm sound or a warning light.
  • FIG. 6 is a block diagram showing the configuration of the energy storage device according to the present invention
  • Figure 7 is a block diagram showing the configuration of the energy storage device according to the invention in detail.
  • the energy storage device 100 is provided in plurality, and receives AC power from each phase of the AC power source 10.
  • one end of the energy storage device 100 may be connected to each phase of the AC power source 10, and the other end thereof may be connected to the adjacent energy storage device 100.
  • the energy storage device 100 is connected to the AC power source 10 and converts AC power transferred from the AC power source 10 into DC power to charge or converts stored DC power into AC power to AC To the power source 10.
  • the energy storage device 100 having 10 batteries 110 corresponding to each of the AC power sources 10 is configured to charge 30 batteries 110 when the entire three-phase power source is used.
  • the energy storage device 100 includes a power converter 120, a battery 110, a relay 130, and a controller 140.
  • the power converter 120 is connected to the AC power source 10 and connected in series to each other, and supplies power to the battery 110 by converting power for charging and discharging. That is, when the power converter 120 receives power from the first AC power source 10, is connected in series to each other, and the energy storage device 100 is connected in plural to each of the AC power sources 10, The power converter located at the end may be connected to the end of the power converter provided in the adjacent energy storage device.
  • the power converter 120 may convert the AC power received from the AC power source 10 into a form of DC power that can be charged and provide the same to the battery 110.
  • the power converter 120 may convert the DC power discharged from the battery 110 into AC power and provide the AC power to the AC power source 10.
  • the battery 110 may charge AC power supplied from the AC power source 10 in the form of DC power via the power converter 120. In addition, the battery 110 may supply the charged DC power to the AC power source 10 in the form of AC power through the power converter 120.
  • the battery 110 may be used a variety of batteries capable of charging and discharging.
  • the battery 110 may be a nickel-cadmium battery, a lead storage battery, a nickel metal hydride battey (NiMH), a lithium ion battery, a lithium polymer battery, or the like. It may include, but is not limited to.
  • the relay 130 is a device that operates when the input reaches a predetermined value to open and close the circuit, and may be provided in plurality between connection terminals of adjacent power converters 120.
  • the relay 130 is initially provided at an input terminal of the AC power source 10, an initial power converter connected to the AC power source 10, and a connection terminal of the power converter adjacent to the initial power converter.
  • the relays 130 may be provided between adjacent power converters, respectively, and the relay 130 located at the end thereof may be provided between the connection ends with the adjacent energy storage device 100.
  • the relay 130 may be maintained in the open state in the normal mode under the control of the controller 140, and the relay 130 corresponding to the selected battery 110 is controlled to the closed state.
  • the relay 11 (R11) is controlled in the closed state, and if the battery 12 or the power converter 12 needs to be replaced or repaired, the relay 12 (R12) is closed. State can be controlled.
  • the battery 110 or the power converter 120 needs to be replaced or repaired, thereby bypassing the entire system, and thus, the battery 110 or the power converter 120 may be moved in a live state without stopping the entire system. Replacement or repair is possible.
  • the controller 140 controls the plurality of relays 130 to the open state in the normal mode according to the user input, and controls the relays connected to the battery 110 selected by the user from the plurality of batteries 110 to the closed state. Can be.
  • the controller 140 controls the relay 130 corresponding to the battery 110 that needs to be replaced or repaired by the user to the closed state, thereby bypassing the battery 110 that needs to be replaced or repaired without stopping the entire system.
  • the battery 110 or the power converter 120 may be replaced or repaired.
  • the controller 140 may control the control voltage of the AC power source 10 for bypassing by Equation 1 below.
  • n is the number of batteries
  • controller 140 may control the control current of the AC power source 10 for bypass when the inverter is linked to the following equation (2).
  • n is the number of batteries
  • 8 is a deficiency diagram for explaining in detail the configuration of an energy storage device according to the invention connected to one phase of an alternating current power source. 8 is a view for explaining the configuration of the power converter 120 in detail, three inverters 121-1, 121-2, 121-3 are connected in multiple stages on R, each inverter 121- 1, 121-2, and 121-3 are exemplary views showing a state in which three batteries are connected to each other.
  • the power converter 120 is connected to an initial AC power source 10, a plurality of inverters 121 connected in series to each other, and one side of the plurality of inverters 121. And a plurality of bidirectional converters 122 connected to each other and connected to the plurality of batteries 110, respectively.
  • the plurality of inverters 121 and the plurality of bidirectional converters 122 may be connected through the fuses 123, respectively.
  • the fuse 123 is cut off due to the heat generated by the current when the short-circuit current and the overload current flows over a predetermined value that may occur in each of the plurality of batteries 110, and automatically cuts off the overcurrent.
  • the inverter 121 may include first and second switches connected in series with each other, and third and fourth switches connected in parallel with the first and second switches.
  • the first inverter 121-1 includes S1 and S2 connected in series with each other, S3 and S4 connected in parallel with S1 and S2
  • the second inverter 121-2 includes S5 and S6 connected in series with each other, S5 and It may be configured to include S7 and S8 connected in parallel with S6.
  • the inverter 121 has an initial inverter connected to an AC power source, a connection end of third and fourth switches of the inverter located at the front end, and a connection end of the first and second switches of the inverter located at the rear end thereof. Can be connected in series with each other in series.
  • the connection terminals of S3 and S4 of the first inverter 121-1 may be connected to S5 and S6 of the second inverter 121-2.
  • the inverter 121 may configure a circuit requiring a plurality of independent power sources into a single input power terminal, that is, an AC power source 10.
  • the relay 130 may be provided between the connection ends of the third and fourth switches of the inverter 121 located at the front end and the connection ends of the first and second switches of the inverter 121 located at the rear end.
  • the connection terminals S3 and S4 of the first inverter 121-1 are connected to the connection terminals S5 and S6 of the second inverter 121-2, and the connection of S7 and S8 of the second inverter 121-2 is performed.
  • the relay 130 may be provided between the connection terminals. That is, when controlling R12 to the closed state, the power transferred from the first inverter 121-1 may be bypassed to the third inverter 121-3. Accordingly, the battery 12, the second converter 122-2 or the second inverter 121-2 may be repaired or replaced in the live state by controlling the closed state of R12 without stopping the system.
  • the relay 130 corresponding to the battery 110 that needs to be replaced or repaired by the user in the closed state bypassing the inverter 121 of the battery 110 that needs to be replaced or repaired without stopping the entire system.
  • the battery 110 or the power converter 120 may be replaced or repaired.
  • the bidirectional converter 122 is provided between the varieties 110 and the inverter 121 to control charge and discharge of the battery 110.
  • the bi-directional converter 122 controls the direction of the current in both directions to control the flow of power in both directions while maintaining the polarity of the power supply voltage unchanged between the battery 110 and the inverter 121.
  • FIG. 9 is an exemplary diagram for describing bypass control for the battery selected in FIG. 8.
  • the controller controls S5 and S7 of the second inverter 121-2 in the closed state, and controls S6 and S8 in the open state to control the second inverter 121. -2) can be bypassed to bypass the battery 12. That is, when only the battery 12 needs to be replaced or repaired, bypass control may be performed only by the switch control of the second inverter 121-2.
  • the present invention is not limited thereto.
  • the bypass control may be performed by controlling the second relay R12 in the closed state.
  • FIG. 10 is a graph showing a switch waveform of an inverter of an energy storage device according to a comparative example
  • FIG. 11 is a graph showing a switch waveform of an inverter of an energy storage device according to an embodiment of the present invention.
  • control unit may control the phase shift angle by controlling the inverter according to the number of batteries.
  • the controller may control the phase shift angle through Equation 3 below.
  • n is the number of batteries
  • the battery system according to the comparative example is composed of one inverter and one battery from the single phase of the AC power source, the energy storage device according to an embodiment of the present invention and three inverters connected in series from the single phase of the AC power source and
  • the comparative example shows a two-level single-phase inverter switching waveform.
  • the embodiment shows a five-level single-phase inverter switching. The waveform is shown. That is, the embodiment has been confirmed that the switching waveform is similar to the sine waveform, that is, the AC waveform in comparison with the comparative example can reduce the filter reactor, assuming that the reactor size can be further reduced in the case of 10 levels It was confirmed that.
  • the energy storage device can realize high power density by reducing the reactor size of the inverter by adjusting the phase shift angle according to the number of batteries.

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

Abstract

La présente invention concerne un système de fonctionnement de micro-réseau autonome permettant de résoudre l'instabilité d'un système auquel une source d'énergie renouvelable est appliquée et de fournir un système d'alimentation électrique optimal. Un système de fonctionnement de mini-réseau électrique selon la présente invention comprend : un dispositif de stockage d'énergie comprenant une batterie pouvant être déchargée ou chargée par fourniture d'énergie à une charge , et un onduleur destiné à commander la charge et la décharge de la batterie ; un dispositif de production d'énergie renouvelable destiné à fournir de l'énergie auxiliaire à la charge tout en étant connecté au dispositif de stockage d'énergie ou destiné à charger le dispositif de stockage d'énergie ; et un dispositif de production d'énergie diesel destiné à fournir de l'énergie auxiliaire à la charge tout en étant connecté au dispositif de stockage d'énergie ou destiné à charger le dispositif de stockage d'énergie, l'onduleur effectuant une commande, en fonction de l'énergie et de la puissance de charge générées par le dispositif de production d'énergie renouvelable ou le dispositif de production d'énergie diesel, de telle sorte que la batterie soit chargée par l'énergie excédentaire lorsque de l'énergie excédentaire existe et qu'une puissance insuffisante est déchargée à travers la batterie lorsque l'énergie excédentaire n'existe pas.
PCT/KR2019/005041 2018-06-20 2019-04-26 Système de fonctionnement de micro-réseau autonome WO2019245155A1 (fr)

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KR10-2018-0070598 2018-06-20
KR1020180070598A KR102582338B1 (ko) 2018-06-20 2018-06-20 독립형 마이크로그리드 운용 시스템

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