CN112366747A - Energy storage and photovoltaic alternating current coupling power supply system - Google Patents
Energy storage and photovoltaic alternating current coupling power supply system Download PDFInfo
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- CN112366747A CN112366747A CN202011179723.4A CN202011179723A CN112366747A CN 112366747 A CN112366747 A CN 112366747A CN 202011179723 A CN202011179723 A CN 202011179723A CN 112366747 A CN112366747 A CN 112366747A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 130
- 230000008878 coupling Effects 0.000 title claims abstract description 29
- 238000010168 coupling process Methods 0.000 title claims abstract description 29
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 29
- 238000010248 power generation Methods 0.000 claims abstract description 15
- 238000007599 discharging Methods 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 63
- 230000000087 stabilizing effect Effects 0.000 claims description 14
- 229920006395 saturated elastomer Polymers 0.000 claims description 5
- 210000000352 storage cell Anatomy 0.000 claims 1
- 210000001503 joint Anatomy 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 230000001276 controlling effect Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
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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
- H02J3/28—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
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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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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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
- 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
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- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The embodiment of the invention discloses an energy storage and photovoltaic alternating current coupling power supply system, which is connected with a user side load and a commercial power grid and comprises the following components: the energy storage module is used for charging or discharging the energy storage battery; the photovoltaic module is in AC coupling connection with the energy storage module and is used for providing solar power generation; and the control module is connected with the energy storage module and the photovoltaic module and is used for selectively controlling the energy storage module and the photovoltaic module to supply power to the user side load according to a power distribution strategy. According to the alternating-current coupling power supply system for the energy storage inverter and the photovoltaic inverter, the energy storage module is connected with the photovoltaic module in an alternating-current coupling mode, the problems of butt joint and compatibility of the energy storage inverters and the photovoltaic inverters of different types in the prior art are solved, and the stability of output voltage of the energy storage inverters and the photovoltaic inverters is guaranteed.
Description
Technical Field
The embodiment of the invention relates to an energy storage technology, in particular to an alternating current coupling power supply system for energy storage and photovoltaic.
Background
With the development of new energy in recent years, photovoltaic systems are more and more introduced into the scenes of household users. Especially in areas with good illumination, photovoltaic power generation brings real benefits to people. However, in daytime, the photovoltaic power can generate power, and when the sun falls on a mountain, the solar energy cannot be used continuously. Meanwhile, with the development of energy storage systems for users, the problem is solved. The household energy storage system can be matched with a photovoltaic system, the battery is charged by the energy storage inverter in the daytime to store redundant solar energy, and the electricity of the battery pack is released by the energy storage inverter at night to be used by the household of the user.
At present, the main current coupling mode of the photovoltaic inverter and the energy storage inverter is direct current coupling, the direct current coupling is simpler in control, but the problems of photovoltaic and energy storage matching exist, protocol butt joint and mutual control are needed, so that the photovoltaic inverters and the energy storage inverters of different manufacturers are difficult to match, and the compatibility is poor.
Some manufacturers propose an alternating current coupling mode, but the problem of unstable parallel connection of the off-grid photovoltaic inverter and the energy storage inverter exists.
Disclosure of Invention
The invention provides an energy storage and photovoltaic alternating-current coupling power supply system, which is used for ensuring the stability of output voltage of an energy storage inverter and a photovoltaic inverter.
The embodiment of the invention provides an energy storage and photovoltaic alternating current coupling power supply system, which is connected with a user side load and a commercial power grid and comprises the following components:
the energy storage module is used for charging or discharging the energy storage battery;
the photovoltaic module is in AC coupling connection with the energy storage module and is used for providing solar power generation;
and the control module is connected with the energy storage module and the photovoltaic module and is used for selectively controlling the energy storage module and the photovoltaic module to supply power to the user side load according to a power distribution strategy.
Optionally, the power distribution policy includes: off-grid conditions and grid-connected conditions.
Optionally, under the off-grid condition, if the energy storage module is in an unsaturated state, the photovoltaic module supplies power to the energy storage module and the user side load at the same time.
Optionally, under the off-grid condition, if the energy storage module is in a saturated state, the photovoltaic module and the energy storage module will simultaneously supply power to the user side load.
Optionally, under the grid-connected condition, the energy storage module and the user side load are supplied with power by the utility power grid.
Optionally, the energy storage module includes a battery circuit, a voltage stabilizing circuit, a buck-boost circuit, and a control circuit.
Optionally, the battery circuit is used for storing or releasing voltage, and the battery circuit includes an energy storage battery C5.
Optionally, the voltage stabilizing circuit is connected to the battery circuit, and is configured to stabilize the circuit voltage when the energy storage battery is charged and discharged, and the voltage stabilizing circuit includes: a MOS tube group Q1, a MOS tube group Q2, a MOS tube group Q3, a MOS tube group Q4, a MOS tube group Q5, a MOS tube group Q6, a MOS tube group Q7, an inductance Lr, a coil Lm 7, a capacitance C7, and a capacitance C7, a first end of the MOS tube group Q7 is connected to a first end of the MOS tube group Q7, a second end of the MOS tube group Q7 is connected to the first end of the MOS tube group Q7, a third end of the MOS tube group Q7 is connected to the first end of the coil Lm 7 and the first end of the coil Lm 7, a second end of the MOS tube group Q7 is connected to the first end of the MOS tube group Q7, a second end of the MOS tube group Q7 is connected to the second end of the coil Lm 7, a second end of the inductance Lr 7 is connected to the second end of the coil Lm 7, and a second end of the inductance Lr 7 are connected to the second end of the capacitance C7, and a second end of the inductance Lr 7 is connected to the second end, A first terminal of a capacitor C2 and a first terminal of a capacitor C3, a second terminal of the capacitor C1, the capacitor C2 and the capacitor C3 is connected to a second terminal of the MOS tube group Q5, a first terminal of the MOS tube group Q5 is connected to a first terminal of the MOS tube group Q6, a second terminal of the MOS tube Q6 is connected to a first terminal of the MOS tube Q8, a second terminal of the MOS tube Q8 is connected to a second terminal of the MOS tube group Q7, and the first terminal of the MOS tube group Q7 is connected to a second terminal of the coil Lm 2.
Optionally, the step-up/step-down circuit is connected to the voltage stabilizing circuit, and is configured to provide a step-up or step-down signal, the step-up/step-down circuit includes: a capacitor C6, a capacitor C7, an inductor L2, an inductor L1, a MOS transistor group DC _ BOOST1, a MOS transistor group DC _ BOOST2, a MOS transistor group BUCK1 and a MOS transistor group BUCK2, wherein a first terminal of the capacitor C6 is connected to a first terminal of the capacitor C7, a second terminal of the capacitor C6 is connected to a second terminal of the capacitor C7, a first terminal of the capacitor C7 is connected to a first terminal of the inductor L2, a second terminal of the inductor L2 is connected to first terminals of the MOS transistor group DC _ BOOST1 and the MOS transistor group BUCK1, a second terminal of the capacitor C7 is connected to a first terminal of the inductor L1, and a second terminal of the inductor L1 is connected to first terminals of the MOS transistor group DC _ BOOST2 and the MOS transistor group BUCK 2.
Optionally, the control circuit is connected to the buck-boost circuit, and is configured to regulate the working condition of the energy storage battery, and the control circuit includes: a capacitor C, a transistor S, an inductor L, a capacitor C, a switch K, a switch F, and a switch F, a first end of the capacitor C being connected to a first end of the transistor S, a second end of the transistor S being connected to a first end of the inductor L, a second end of the inductor L being connected to a first end of the switch K, a second end of the switch K being connected to a first end of the switch F, a second end of the transistor S being connected to a second end of the transistor S, a first end of the transistor S being connected to a first end of the transistor S, a first terminal of the capacitor C9 is connected to the first terminal of the transistor S6, a second terminal of the transistor S6 is connected to the first terminal of the transistor S7, a second terminal of the transistor S7 is connected to the first terminal of the inductor L4, a second terminal of the inductor L4 is connected to the first terminal of the switch K2, a second terminal of the switch K2 is connected to the first terminal of the switch F2, a second terminal of the transistor S4 is connected to the second terminal of the transistor S8, a first terminal of the transistor S8 is connected to the first terminal of the transistor S4, a first terminal of the capacitor C16 is connected to the second terminal of the inductor L3, a second terminal of the capacitor C16 is connected to the second terminal of the capacitor C17, and a first terminal of the capacitor C17 is connected to the first terminal of the inductor L4.
The embodiment of the invention discloses an energy storage and photovoltaic alternating current coupling power supply system, which is connected with a user side load and a commercial power grid and comprises the following components: the energy storage module is used for charging or discharging the energy storage battery; the photovoltaic module is in AC coupling connection with the energy storage module and is used for providing solar power generation; control module, said control module and
the energy storage module is connected with the photovoltaic module and used for selectively controlling the energy storage module and the photovoltaic module to supply power to the user side load according to a power distribution strategy. According to the alternating-current coupling power supply system for the energy storage inverter and the photovoltaic inverter, the energy storage module is connected with the photovoltaic module in an alternating-current coupling mode, the problems of butt joint and compatibility of the energy storage inverters and the photovoltaic inverters of different types in the prior art are solved, and the stability of output voltage of the energy storage inverters and the photovoltaic inverters is guaranteed.
Drawings
Fig. 1 is a block diagram of an ac-coupled power supply system for storing energy and photovoltaic power according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a battery circuit and a voltage regulator circuit according to a second embodiment of the present invention;
fig. 3 is a circuit diagram of a buck-boost circuit according to a second embodiment of the present invention;
fig. 4 is a circuit diagram of a control circuit according to a second embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the steps as a sequential process, many of the steps can be performed in parallel, concurrently or simultaneously. In addition, the order of the steps may be rearranged. A process may be terminated when its operations are completed, but may have additional steps not included in the figure. A process may correspond to a method, a function, a procedure, a subroutine, a subprogram, etc.
Furthermore, the terms "first," "second," and the like may be used herein to describe various orientations, actions, steps, elements, or the like, but the orientations, actions, steps, or elements are not limited by these terms. These terms are only used to distinguish one direction, action, step or element from another direction, action, step or element. For example, the first voltage may be referred to as a second voltage, and similarly, the second voltage may be referred to as the first voltage, without departing from the scope of the present application. The first voltage and the second voltage are both voltages, but they are not the same voltage. The terms "first", "second", etc. are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Example one
Fig. 1 is a block connection diagram of an energy storage and photovoltaic ac-coupled power supply system according to an embodiment of the present invention, where the energy storage and photovoltaic ac-coupled power supply system according to the embodiment is suitable for a situation of power supply of a user, and specifically, the energy storage and photovoltaic ac-coupled power supply system according to an embodiment of the present invention is connected to a user side load 4 and a utility grid 5, and includes: energy storage module 1, photovoltaic module 2 and control module 3.
The energy storage module 1 is used for charging or discharging an energy storage battery.
In the present embodiment, the energy storage module 1 refers to a storage battery for storing energy for solar power generation equipment, wind power generation equipment, and renewable energy, and can supply power to the user side load 4 by repeating the charging and discharging process. By way of example, the energy storage module 1 comprises: the battery, the direct current transformer and the alternating current transformer are controlled to be charged or not through the switch, the control module 3 can be charged through the first voltage when the battery is in a charging state, and the control module 3 can be discharged through the second voltage when the battery is in a discharging device.
The photovoltaic module 2 is connected with the energy storage module 1 in an alternating current coupling mode and used for providing solar power generation.
In the present embodiment, the photovoltaic module 2 is a power generation system that directly converts light energy into electric energy without a thermal process, and the main components include a solar cell, a storage battery, a controller, and an inverter, and is characterized by high reliability, long service life, no environmental pollution, independent power generation, and grid-connected operation. Illustratively, the photovoltaic module 2 includes a photovoltaic power generation system and an inverter, and the photovoltaic power generation system and the inverter control whether to supply power to the control module 3 through a switch, and when supplying power, the photovoltaic power generation system and the inverter provide a second voltage to the control module 3.
The control module 3 is connected with the energy storage module 1 and the photovoltaic module 2 and is used for selectively controlling the energy storage module 1 and the photovoltaic module 2 to supply power to the user side load 4 according to a power distribution strategy.
In this embodiment, the control module 3 monitors and allocates the power supply mode, for example, when the utility power grid 5 normally works, the utility power grid 5 preferentially supplies power to the user side load 4, and when the utility power grid 5 fails, the photovoltaic device and the energy storage device supply power to the user side load 4, and under a normal condition, the utility power grid 5 and the photovoltaic device charge the energy storage device to keep the full power state. Illustratively, the control device comprises a power distribution switch, a system control, an ammeter and a mutual inductance sensor, and the control device generates control signals by monitoring the working condition of each module. The power distribution strategy comprises: off-grid conditions and grid-connected conditions. Under the off-grid condition, if the energy storage module 1 is in an unsaturated state, the photovoltaic module 2 supplies power to the energy storage module 1 and the user side load 4 at the same time. Under the off-grid condition, if the energy storage module 1 is in a saturated state, the photovoltaic module 2 and the energy storage module 1 simultaneously supply power to the user side load 4. Under the condition of grid connection, the commercial power grid 5 supplies power to the energy storage module 1 and the user side load 4. For example, in this embodiment, under a normal working condition of the utility grid 5, the utility grid 5 preferentially reads the power supplied by the user-side load 4, and if the battery of the energy storage module 1 is not saturated, the battery can be charged at the same time. After the commercial power grid 5 is disconnected, the photovoltaic system can directly supply power to the user side load 4, at the moment, if the battery of the energy storage module 1 is in a saturated state, the photovoltaic system and the energy storage module 1 can simultaneously supply power to the user side load 4, and when the battery of the energy storage module 1 exhausts the electric quantity, the photovoltaic system can simultaneously charge the user side load 4 and the battery at the moment.
The embodiment of the invention discloses an energy storage and photovoltaic alternating current coupling power supply system, which is connected with a user side load and a commercial power grid and comprises the following components: the energy storage module is used for charging or discharging the energy storage battery; the photovoltaic module is in AC coupling connection with the energy storage module and is used for providing solar power generation; and the control module is connected with the energy storage module and the photovoltaic module and is used for selectively controlling the energy storage module and the photovoltaic module to supply power to the user side load according to a power distribution strategy. According to the alternating-current coupling power supply system for the energy storage inverter and the photovoltaic inverter, the energy storage module is connected with the photovoltaic module in an alternating-current coupling mode, the problems of butt joint and compatibility of the energy storage inverters and the photovoltaic inverters of different types in the prior art are solved, and the stability of output voltage of the energy storage inverters and the photovoltaic inverters is guaranteed.
Example two
The embodiment introduces specific structures of different modules in detail on the basis of the first embodiment, and the energy storage and photovoltaic ac-coupled power supply system provided by the embodiment is suitable for a situation of power supply of a user, and specifically, the energy storage and photovoltaic ac-coupled power supply system provided by the first embodiment of the present invention is connected to a user side load 4 and a utility power grid 5, and includes: energy storage module 1, photovoltaic module 2 and control module 3.
The energy storage module 1 is used for charging or discharging the energy storage battery. The energy storage module 1 comprises a battery circuit 11, a voltage stabilizing circuit 12, a buck-boost circuit 13 and a control circuit 14.
Referring to fig. 2, fig. 2 is a circuit diagram of a battery circuit 11 and a voltage stabilizing circuit 12 in the present embodiment, where the battery circuit 11 is used for storing or releasing voltage, and the battery circuit 11 includes an energy storage battery C5.
In this embodiment, the type of the energy storage battery C5 may be selected according to the actual application, and is not particularly limited in this embodiment.
The voltage stabilizing circuit 12 is connected to the battery circuit 11, and is configured to stabilize the circuit voltage when the energy storage battery is charged and discharged, and the voltage stabilizing circuit 12 includes: a MOS tube group Q1, a MOS tube group Q2, a MOS tube group Q3, a MOS tube group Q4, a MOS tube group Q5, a MOS tube group Q6, a MOS tube group Q7, an inductance Lr, a coil Lm 7, a capacitance C7, and a capacitance C7, a first end of the MOS tube group Q7 is connected to a first end of the MOS tube group Q7, a second end of the MOS tube group Q7 is connected to the first end of the MOS tube group Q7, a third end of the MOS tube group Q7 is connected to the first end of the coil Lm 7 and the first end of the coil Lm 7, a second end of the MOS tube group Q7 is connected to the first end of the MOS tube group Q7, a second end of the MOS tube group Q7 is connected to the second end of the coil Lm 7, a second end of the inductance Lr 7 is connected to the second end of the coil Lm 7, and a second end of the inductance Lr 7 are connected to the second end of the capacitance C7, and a second end of the inductance Lr 7 is connected to the second end, A first terminal of a capacitor C2 and a first terminal of a capacitor C3, a second terminal of the capacitor C1, the capacitor C2 and the capacitor C3 is connected to a second terminal of the MOS tube group Q5, a first terminal of the MOS tube group Q5 is connected to a first terminal of the MOS tube group Q6, a second terminal of the MOS tube Q6 is connected to a first terminal of the MOS tube Q8, a second terminal of the MOS tube Q8 is connected to a second terminal of the MOS tube group Q7, and the first terminal of the MOS tube group Q7 is connected to a second terminal of the coil Lm 2.
Referring to fig. 3, fig. 3 is a circuit diagram of a buck-boost circuit 13 in this embodiment, the buck-boost circuit 13 is connected to the voltage stabilizing circuit 12 for providing a boost or buck signal, and the buck-boost circuit 13 includes: a capacitor C6, a capacitor C7, an inductor L2, an inductor L1, a MOS transistor group DC _ BOOST1, a MOS transistor group DC _ BOOST2, a MOS transistor group BUCK1 and a MOS transistor group BUCK2, wherein a first terminal of the capacitor C6 is connected to a first terminal of the capacitor C7, a second terminal of the capacitor C6 is connected to a second terminal of the capacitor C7, a first terminal of the capacitor C7 is connected to a first terminal of the inductor L2, a second terminal of the inductor L2 is connected to first terminals of the MOS transistor group DC _ BOOST1 and the MOS transistor group BUCK1, a second terminal of the capacitor C7 is connected to a first terminal of the inductor L1, and a second terminal of the inductor L1 is connected to first terminals of the MOS transistor group DC _ BOOST2 and the MOS transistor group BUCK 2.
Referring to fig. 4, fig. 4 is a circuit diagram of the boost control circuit 145 in this embodiment, the control circuit 145 is connected to the buck-boost circuit 13 for controlling the working condition of the energy storage battery in a voltage stabilizing manner, and the control circuit 145 includes: a capacitor C, a transistor S, an inductor L, a capacitor C, a switch K, a switch F, and a switch F, a first end of the capacitor C being connected to a first end of the transistor S, a second end of the transistor S being connected to a first end of the inductor L, a second end of the inductor L being connected to a first end of the switch K, a second end of the switch K being connected to a first end of the switch F, a second end of the transistor S being connected to a second end of the transistor S, a first end of the transistor S being connected to a first end of the transistor S, a first terminal of the capacitor C9 is connected to the first terminal of the transistor S6, a second terminal of the transistor S6 is connected to the first terminal of the transistor S7, a second terminal of the transistor S7 is connected to the first terminal of the inductor L4, a second terminal of the inductor L4 is connected to the first terminal of the switch K2, a second terminal of the switch K2 is connected to the first terminal of the switch F2, a second terminal of the transistor S4 is connected to the second terminal of the transistor S8, a first terminal of the transistor S8 is connected to the first terminal of the transistor S4, a first terminal of the capacitor C16 is connected to the second terminal of the inductor L3, a second terminal of the capacitor C16 is connected to the second terminal of the capacitor C17, and a first terminal of the capacitor C17 is connected to the first terminal of the inductor L4.
In this embodiment, during grid connection, the energy storage inverter and the photovoltaic inverter track the utility power, and the energy storage inverter controls charging and discharging management according to the power information calculated by the control module 3. When the grid is off, the S1 switch is turned off, the energy storage inverter works in a voltage source mode, and the photovoltaic inverter tracks the energy storage inverter to work in a current source mode. The energy storage inverter balances output voltage by controlling the charging and discharging modes and power. The bidirectional flow of the discharge energy is realized by the voltage stabilizing circuit 12 and the voltage boosting and reducing circuit 13. The bus voltage is converted into power frequency 120V/240V commercial power through a three-level inversion topology, and bidirectional flow of energy is realized in a grid-connected mode; when in off-grid mode, the energy can be directly provided for the load. Illustratively, the voltage regulator circuit 12 is regulated by a full bridge LLC + DC/DC circuit control. The Boost-Buck circuit 13 is switched on alternately by a Boost tube and a Buck tube in each switching period.
In an off-grid mode, if the power of the photovoltaic inverter is greater than the load power, the AC output voltage is increased, and the redundant energy on the AC side is fed back to the bus to charge the battery under the action of an off-grid control loop; if the photovoltaic inverter is insufficient in power, the battery discharges to provide energy for the inverter to supply power to the load. When the bus voltage is higher than a voltage stabilizing value, the voltage stabilizing circuit 12 charges a battery to enable the bus voltage to fall back; when the bus voltage is lower than the regulated voltage value, the battery discharges to boost the bus, so that the buck-boost circuit 13 is switched on alternately in each switching cycle in the working state. If the battery is fully charged and the energy of the photovoltaic inverter is larger than the energy required by the load, the purpose of bus voltage reduction is achieved by limiting the power of the energy storage inverter.
The embodiment of the invention discloses an energy storage and photovoltaic alternating current coupling power supply system, which is connected with a user side load and a commercial power grid and comprises the following components: the energy storage module is used for charging or discharging the energy storage battery; the photovoltaic module is in AC coupling connection with the energy storage module and is used for providing solar power generation; and the control module is connected with the energy storage module and the photovoltaic module and is used for selectively controlling the energy storage module and the photovoltaic module to supply power to the user side load according to a power distribution strategy. According to the alternating-current coupling power supply system for the energy storage inverter and the photovoltaic inverter, the energy storage module is connected with the photovoltaic module in an alternating-current coupling mode, the problems of butt joint and compatibility of the energy storage inverters and the photovoltaic inverters of different types in the prior art are solved, and the stability of output voltage of the energy storage inverters and the photovoltaic inverters is guaranteed.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. The utility model provides an energy storage and photovoltaic's alternating current coupling power supply system, with user side load and commercial power electric wire netting connection, its characterized in that includes:
the energy storage module is used for charging or discharging the energy storage battery;
the photovoltaic module is in AC coupling connection with the energy storage module and is used for providing solar power generation;
and the control module is connected with the energy storage module and the photovoltaic module and is used for selectively controlling the energy storage module and the photovoltaic module to supply power to the user side load according to a power distribution strategy.
2. An energy storage and photovoltaic AC-coupled power supply system according to claim 1 and wherein said power distribution strategy comprises: off-grid conditions and grid-connected conditions.
3. An energy storage and photovoltaic ac-coupled power supply system according to claim 2, wherein in the off-grid condition, if the energy storage module is not saturated, the photovoltaic module will supply power to both the energy storage module and the customer premise load.
4. An energy storage and photovoltaic ac-coupled power supply system according to claim 2, wherein in the off-grid condition, if the energy storage module is in saturation, the photovoltaic module and the energy storage module will simultaneously supply power to the user-side load.
5. The ac-coupled power supply system according to claim 2, wherein the utility grid supplies power to the energy storage module and the user side load under the grid-connected condition.
6. An energy storage and photovoltaic AC-coupled power supply system according to claim 1 and wherein said energy storage module comprises battery circuitry, voltage regulation circuitry, buck-boost circuitry and control circuitry.
7. An energy storage and photovoltaic AC-coupled power supply system according to claim 6 and wherein said battery circuit is adapted to store or discharge voltage and said battery circuit comprises energy storage cell C5.
8. An energy storage and photovoltaic AC-coupled power supply system according to claim 6, wherein said voltage regulator circuit is in circuit connection with said battery for stabilizing the circuit voltage during charging and discharging of said energy storage battery, said voltage regulator circuit comprising: a MOS tube group Q1, a MOS tube group Q2, a MOS tube group Q3, a MOS tube group Q4, a MOS tube group Q5, a MOS tube group Q6, a MOS tube group Q7, an inductance Lr, a coil Lm 7, a capacitance C7, and a capacitance C7, a first end of the MOS tube group Q7 is connected to a first end of the MOS tube group Q7, a second end of the MOS tube group Q7 is connected to the first end of the MOS tube group Q7, a third end of the MOS tube group Q7 is connected to the first end of the coil Lm 7 and the first end of the coil Lm 7, a second end of the MOS tube group Q7 is connected to the first end of the MOS tube group Q7, a second end of the MOS tube group Q7 is connected to the second end of the coil Lm 7, a second end of the inductance Lr 7 is connected to the second end of the coil Lm 7, and a second end of the inductance Lr 7 are connected to the second end of the capacitance C7, and a second end of the inductance Lr 7 is connected to the second end, A first terminal of a capacitor C2 and a first terminal of a capacitor C3, a second terminal of the capacitor C1, the capacitor C2 and the capacitor C3 is connected to a second terminal of the MOS tube group Q5, a first terminal of the MOS tube group Q5 is connected to a first terminal of the MOS tube group Q6, a second terminal of the MOS tube Q6 is connected to a first terminal of the MOS tube Q8, a second terminal of the MOS tube Q8 is connected to a second terminal of the MOS tube group Q7, and the first terminal of the MOS tube group Q7 is connected to a second terminal of the coil Lm 2.
9. An energy storage and photovoltaic AC-coupled power supply system according to claim 6, wherein said buck-boost circuit is connected to said voltage regulator circuit for providing a boost or buck signal, said buck-boost circuit comprising: a capacitor C6, a capacitor C7, an inductor L2, an inductor L1, a MOS transistor group DC _ BOOST1, a MOS transistor group DC _ BOOST2, a MOS transistor group BUCK1 and a MOS transistor group BUCK2, wherein a first terminal of the capacitor C6 is connected to a first terminal of the capacitor C7, a second terminal of the capacitor C6 is connected to a second terminal of the capacitor C7, a first terminal of the capacitor C7 is connected to a first terminal of the inductor L2, a second terminal of the inductor L2 is connected to first terminals of the MOS transistor group DC _ BOOST1 and the MOS transistor group BUCK1, a second terminal of the capacitor C7 is connected to a first terminal of the inductor L1, and a second terminal of the inductor L1 is connected to first terminals of the MOS transistor group DC _ BOOST2 and the MOS transistor group BUCK 2.
10. An energy storage and photovoltaic ac-coupled power supply system according to claim 6, wherein the control circuit is connected to the buck-boost circuit for voltage-stabilizing control of the operation of the energy storage battery, and the control circuit comprises: a capacitor C, a transistor S, an inductor L, a capacitor C, a switch K, a switch F, and a switch F, a first end of the capacitor C being connected to a first end of the transistor S, a second end of the transistor S being connected to a first end of the inductor L, a second end of the inductor L being connected to a first end of the switch K, a second end of the switch K being connected to a first end of the switch F, a second end of the transistor S being connected to a second end of the transistor S, a first end of the transistor S being connected to a first end of the transistor S, a first terminal of the capacitor C9 is connected to the first terminal of the transistor S6, a second terminal of the transistor S6 is connected to the first terminal of the transistor S7, a second terminal of the transistor S7 is connected to the first terminal of the inductor L4, a second terminal of the inductor L4 is connected to the first terminal of the switch K2, a second terminal of the switch K2 is connected to the first terminal of the switch F2, a second terminal of the transistor S4 is connected to the second terminal of the transistor S8, a first terminal of the transistor S8 is connected to the first terminal of the transistor S4, a first terminal of the capacitor C16 is connected to the second terminal of the inductor L3, a second terminal of the capacitor C16 is connected to the second terminal of the capacitor C17, and a first terminal of the capacitor C17 is connected to the first terminal of the inductor L4.
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