CN117048401A - Auxiliary loop power supply system based on small light storage inverter and control method - Google Patents

Auxiliary loop power supply system based on small light storage inverter and control method Download PDF

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Publication number
CN117048401A
CN117048401A CN202310715179.8A CN202310715179A CN117048401A CN 117048401 A CN117048401 A CN 117048401A CN 202310715179 A CN202310715179 A CN 202310715179A CN 117048401 A CN117048401 A CN 117048401A
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CN
China
Prior art keywords
grid
power
inverter
energy storage
storage battery
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Pending
Application number
CN202310715179.8A
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Chinese (zh)
Inventor
王小飞
王国俊
王辰冰
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Hangzhou Shanchong Juneng New Energy Co ltd
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Hangzhou Shanchong Juneng New Energy Co ltd
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Priority to CN202310715179.8A priority Critical patent/CN117048401A/en
Publication of CN117048401A publication Critical patent/CN117048401A/en
Pending legal-status Critical Current

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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
    • H02J3/28—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/30—Constructional details of charging stations
    • B60L53/31—Charging columns specially adapted for electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/50—Charging stations characterised by energy-storage or power-generation means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/50—Charging stations characterised by energy-storage or power-generation means
    • B60L53/51—Photovoltaic means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/64—Optimising energy costs, e.g. responding to electricity rates
    • 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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00—Converter types
    • B60L2210/10—DC to DC converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00—Converter types
    • B60L2210/40—DC to AC converters
    • 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
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention provides an auxiliary loop power supply system and a control method based on a small-sized light storage inverter, wherein the auxiliary loop power supply system comprises a direct-current charging pile, a photovoltaic panel, an energy storage battery system and a grid-connected inverter; the direct current charging pile comprises an auxiliary loop, the auxiliary loop comprises a load management server, and the load management server is used for feeding back power grid outage information to the server; the photovoltaic panel and the energy storage battery system are connected with the grid-connected inverter; in the off-grid state, the auxiliary loop takes electricity from the grid-connected inverter, and the grid-connected inverter converts direct current of the photovoltaic panel or the energy storage battery system into alternating current, so that the auxiliary loop works normally. According to the invention, under the off-grid state, the auxiliary circuit of the direct current charging pile can take electricity from the grid-connected inverter, and the grid-connected inverter converts direct current of the photovoltaic panel or the energy storage battery system into alternating current, so that the auxiliary circuit works normally, and high-power charging of the electric automobile under the off-grid state can be realized.

Description

Auxiliary loop power supply system based on small light storage inverter and control method
Technical Field
The invention relates to the technical field of charging piles, in particular to an auxiliary loop power supply system based on a small light storage inverter and a control method.
Background
The direct current charging pile is an important infrastructure for supplementing electric energy for the electric automobile. Generally, a direct current charging pile comprises a charging loop and an auxiliary loop, wherein the charging loop is used for providing direct current after power grid energy conversion for an electric automobile to charge, and the auxiliary loop is used for realizing power distribution, electric energy metering, ordered charging control and the like.
However, the auxiliary circuit of the existing direct current charging pile directly takes power from the power grid and converts the power into low-voltage direct current, and if power failure occurs in the power grid, the auxiliary circuit loses power and cannot work normally under the off-grid condition. An improvement of the technical problem is that the high-voltage direct current of the fuel cell is converted into the low-voltage direct current for the auxiliary loop, but the scheme can not provide the electric energy requirement of alternating current electric equipment such as a liquid cooling/air cooling radiator, so that the high-power charging of the electric automobile in an off-grid state can not be ensured, and the technical problem that the auxiliary loop can not work normally under the off-grid condition still exists when the energy of the fuel cell is insufficient.
Disclosure of Invention
The invention provides an auxiliary loop power supply system based on a small-sized light storage inverter and a control method, which are used for solving the technical problem that an auxiliary loop of a charging pile cannot work normally under the off-grid condition.
The invention solves the technical problems by adopting the following technical scheme:
an object of the present invention is to provide an auxiliary loop power supply system based on a small-sized light storage inverter, comprising: the system comprises a direct current charging pile, a photovoltaic panel, an energy storage battery system and a grid-connected inverter; the direct current charging pile comprises an auxiliary loop, wherein the auxiliary loop comprises a load management server, and the load management server is used for feeding back power grid outage information to the server; the photovoltaic panel and the energy storage battery system are connected with the grid-connected inverter; in the off-grid state, the auxiliary circuit takes electricity from the grid-connected inverter, and the grid-connected inverter converts direct current of the photovoltaic panel or the energy storage battery system into alternating current, so that the auxiliary circuit works normally.
In a preferred embodiment of the present invention, the auxiliary loop power supply system further comprises a first ac bus and a second ac bus; the charging loop of the charging pile is connected with a power grid through the first alternating current bus and is used for supplementing electric energy for the electric automobile; the auxiliary circuit is connected with the second alternating current bus; when the power grid is electrified, the second alternating current bus is electrified from the power grid; and in an off-grid state, the second alternating current bus is used for taking electricity from the grid-connected inverter.
In a preferred embodiment of the present invention, when the power grid is powered, the load management server controls the grid-connected inverter to be connected to the power grid, and the grid-connected inverter operates in a discharging mode-grid-connected mode, so that the power generated by the photovoltaic panel is used for being reversely transmitted to the power grid, or operates in a charging mode, so that the electric energy of the power grid is stored in the energy storage battery system.
In a preferred embodiment of the present invention, the grid-connected inverter includes a photovoltaic panel interface, a maximum power point tracking control solar controller, an energy storage battery system interface, a bidirectional DC/DC Buck-Boost circuit, a bidirectional DC/AC rectifying circuit, and a second selection switch; the photovoltaic panel interface is connected with the photovoltaic panel; the maximum power point tracking control solar controller is connected with the photovoltaic panel interface; the energy storage battery system interface is connected with the energy storage battery system; the maximum power point tracking control solar controller, the energy storage battery system interface and the bidirectional DC/AC rectification circuit are all connected with the bidirectional DC/DC Buck-Boost circuit; the first end of the second selection switch is connected with the DC/AC rectification circuit, and the second end of the second selection switch is used for selecting one connection or disconnection of the auxiliary loop, the first configuration point of the power grid and the second configuration point of the power grid.
In a preferred embodiment of the present invention, the auxiliary loop power supply system further comprises a charging pile dc bus; and under the off-grid state, connecting the charging pile direct current bus with the energy storage battery system, wherein a charging loop of the charging pile receives the direct current of the charging pile direct current bus so as to be used for supplementing electric energy for the electric automobile.
In a preferred embodiment of the present invention, the load management server includes a loop control switch, a second switching power supply, an uninterruptible power supply, a switch, a router, and a control board; the loop control switch is connected with the second switching power supply; the uninterruptible power supply is connected with the second switching power supply to receive direct-current power supply of the second switching power supply; the switch, the router and the control board are all connected with the uninterruptible power supply.
Another object of the present invention is to provide a control method of an auxiliary loop power supply system based on a small-sized light storage inverter, wherein the auxiliary loop power supply system based on the small-sized light storage inverter comprises a direct current charging pile, a photovoltaic panel, an energy storage battery system and a grid-connected inverter; the direct current charging pile comprises an auxiliary loop, wherein the auxiliary loop comprises a load management server, and the load management server is used for feeding back power grid outage information to the server; the photovoltaic panel and the energy storage battery system are connected with the grid-connected inverter; the control method comprises the following steps: judging whether the network is in an off-grid state or not; if not, the auxiliary loop takes electricity from the power grid; if yes, the auxiliary loop takes electricity from the grid-connected inverter, and the grid-connected inverter converts direct current of the photovoltaic panel or the energy storage battery system into alternating current, so that the auxiliary loop works normally.
In a preferred embodiment of the present invention, the grid-connected inverter converts direct current of the photovoltaic panel or the energy storage battery system into alternating current, including: judging whether the grid-connected inverter receives direct current of the photovoltaic panel in an off-grid state; if yes, the grid-connected inverter converts direct current of the photovoltaic panel into alternating current; otherwise, the grid-connected inverter converts the direct current of the energy storage battery system into alternating current.
In a preferred embodiment of the present invention, the control method includes: when the power grid is electrified, judging whether the sunlight is sufficient or not; if yes, the load management server controls the grid-connected inverter to be connected with the power grid, and the grid-connected inverter works in a discharging mode-grid connection so that the power generation of the photovoltaic panel is reversely transmitted to the power grid; or when the power grid is electrified, judging whether the electricity price is in a valley or not; if yes, the load management server controls the grid-connected inverter to be connected with the power grid, the grid-connected inverter works in a charging mode and is used for storing electric energy of the power grid into the energy storage battery system, if not, the load management server controls the grid-connected inverter to be connected with the auxiliary loop, the grid-connected inverter works in a discharging mode-grid connection and converts direct current of the energy storage battery system into alternating current, and therefore the auxiliary loop works normally.
In a preferred embodiment of the present invention, the control method includes: when the power grid is electrified, judging whether the SOC of the energy storage battery system is smaller than a preset electric quantity value or not; if yes, the load management server controls the grid-connected inverter to be connected with the power grid, and the grid-connected inverter works in a charging mode and is used for storing electric energy of the power grid to the energy storage battery system; and if not, the load management server controls the grid-connected inverter to be connected with the power grid, and the grid-connected inverter works in a discharging mode-grid-connected mode so as to reversely convey the power generation of the photovoltaic panel to the power grid.
The technical effects achieved by adopting the technical scheme are as follows: when the power grid is electrified, the auxiliary loop of the direct-current charging pile can take electricity from the power grid; under the off-grid state, the auxiliary loop of the direct current charging pile can take electricity from the grid-connected inverter, and the grid-connected inverter converts direct current of the photovoltaic panel or the energy storage battery system into alternating current, so that the auxiliary loop works normally, and high-power charging of the electric automobile under the off-grid state can be realized. And moreover, the load management server can be internally provided with an uninterruptible power supply, so that the auxiliary loop can realize seamless switching of the power supply in an off-grid state, thereby obtaining electricity and working normally. In addition, the grid-connected inverter can also be set to enter a discharging mode-grid connection, and the generated electricity of the photovoltaic panel is reversely transmitted to the power grid, so that green electricity can be accessed to the grid, and station camp is improved; or setting a charging mode, storing the electric energy of the power grid into the energy storage battery system, and releasing the electric energy to the auxiliary circuit for supplying power when the electric energy is off-grid or the electricity price is high.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention, as well as the preferred embodiments thereof, together with the following detailed description of the invention, given by way of illustration only, together with the accompanying drawings.
Drawings
Fig. 1 is a circuit connection diagram of an auxiliary loop power supply system based on a small-sized light storage inverter according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a grid-connected inverter of the auxiliary loop power supply system based on a small-sized light storage inverter according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of an auxiliary loop power supply system based on a compact light storage inverter according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a load management server of an auxiliary loop power supply system based on a small-sized light storage inverter according to an embodiment of the present invention;
FIG. 5 is a flow chart of a control method of an auxiliary loop power supply system based on a compact light storage inverter according to an embodiment of the present invention;
fig. 6 is a control flow diagram of an auxiliary loop power supply system based on a compact light storage inverter according to an embodiment of the invention.
Detailed Description
In order to further illustrate the technical means and efficacy of the present invention as utilized to achieve the intended purpose, embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below are only some, but not all, embodiments of the invention. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on the embodiments of the present invention, are within the scope of the embodiments of the present invention. While the invention may be susceptible to further details of embodiment and specific details of construction and operation for achieving the desired purpose, there is shown in the drawings a form a further embodiment which may be used herein before to provide a further understanding of the invention.
Fig. 1 is a circuit connection diagram of an auxiliary loop power supply system based on a small-sized light storage inverter according to an embodiment of the present invention. As shown in fig. 1, an embodiment of the present invention provides an auxiliary loop power supply system based on a small-sized light storage inverter, which includes a dc charging pile, a photovoltaic panel 300, an energy storage battery system 200, and a grid-connected inverter 100. The direct current charging pile comprises an auxiliary loop, and the auxiliary loop comprises a load management server 400; the load management server 400 is used for feeding back power grid outage information to the server; both the photovoltaic panel 300 and the energy storage battery system 200 are connected to the grid-tied inverter 100. In the off-grid state, the auxiliary circuit takes power from the grid-connected inverter 100, and the grid-connected inverter 100 converts the direct current of the photovoltaic panel 300 or the energy storage battery system 200 into alternating current, so that the auxiliary circuit works normally.
Optionally, as shown in fig. 1, the auxiliary loop power supply system includes a first ac bus and a second ac bus; the charging loop of the charging pile is connected with a power grid through a first alternating current bus and is used for supplementing electric energy for the electric automobile; the auxiliary loop is connected with the second alternating current bus; when the power grid is electrified, the second alternating current bus is electrified from the power grid; when the grid is powered down, the second ac bus takes power from grid-tied inverter 100. Optionally, the first AC bus is AC380V and the second AC bus is AC220V.
Optionally, grid-tie inverter 100 includes a photovoltaic panel interface, a maximum power point tracking control solar controller (MPPT, maximum Power Point Tracking), an energy storage battery system interface, a DC/DC Buck-Boost circuit, a DC/AC rectification circuit. The photovoltaic panel interface is connected with the photovoltaic panel 300; the maximum power point tracking control solar controller is connected with the photovoltaic panel interface to monitor the power generation voltage of the photovoltaic panel 300 in real time and adjust the output voltage of the photovoltaic panel 300 so as to enable the photovoltaic panel 300 to work at the maximum power; the energy storage battery system interface is connected with the energy storage battery system 200; the DC/DC Buck-Boost circuit is used for converting direct current sent by the maximum power point tracking control solar controller or direct current sent by the energy storage battery system 200 into direct current with rated voltage; the DC/AC rectification circuit is connected to the DC/DC Buck-Boost circuit for converting the DC power of the rated voltage to an AC power of the rated voltage, such as mains frequency AC power, and for providing the AC power of the rated voltage when the grid-tie inverter 100 is connected to the auxiliary circuit.
Optionally, the load management server 400 is provided with an uninterruptible power supply 403, so that when the power grid is disconnected, the load management server 400 can receive direct voltage and current provided by the uninterruptible power supply 403 and continue to work, and feed back power grid outage information to the server, the server can be used for controlling the auxiliary loop to take power from the grid-connected inverter 100, the load management server 400 can be used for controlling the grid-connected inverter 100 to be connected with the auxiliary loop, the grid-connected inverter 100 converts direct current of the photovoltaic panel 300 or the energy storage battery system 200 into alternating current, and therefore the auxiliary loop can realize seamless switching of the power supply in a off-grid state, can obtain power and work normally.
Alternatively, the load management server 400 is connected to a server, and the load management server 400 may feed back power outage information to the server, which may be used to control whether the grid-tied inverter 100 is connected to an auxiliary circuit.
Optionally, the auxiliary loop power supply system further comprises a charging pile direct current bus; in the off-grid state, the charging pile direct current bus is connected with the energy storage battery system 200, and the charging loop of the charging pile receives the direct current of the charging pile direct current bus so as to be used for supplementing electric energy for the electric automobile.
Specifically, as shown in fig. 1, the auxiliary circuit of the dc charging pile includes a first switching power supply 410, a control unit 420, and a load management server 400. When the power grid is powered, the auxiliary circuit may draw power from the power grid, for example, the auxiliary circuit may be connected to a second AC busbar (voltage, e.g., AC 220V) which is connected to the power grid (voltage, e.g., 220V), and the auxiliary circuit draws power from the power grid via the second AC busbar. The AC/DC power module 430 may receive grid AC power via a first AC bus (e.g., AC 380V) and may be configured to convert the AC power to DC power to supplement the electric vehicle. After the first switching power supply 410 is powered, the alternating current is converted into direct current, and the direct current is provided to the direct current electric equipment such as the control unit 420. The control unit 420 is used for performing power distribution, electric energy metering, sequential charging control and the like on the direct current output by the AC/DC power module 430. The direct current charging pile can further comprise alternating current electric equipment such as a heat dissipation system axial flow fan and a charging pile heat dissipation system water pump, and the heat dissipation system axial flow fan and the charging pile heat dissipation system water pump can be connected with the same power supply arranged in the auxiliary loop, for example, are connected with a second alternating current bus to take electricity from a power grid. Therefore, when the power grid is electrified, the auxiliary circuit of the direct-current charging pile can normally work after the power grid is electrified, and the charging pile starts to work.
When the dc charging pile does not receive power from the power grid in the off-grid state, the load management server 400 feeds back power outage information to the server, and the auxiliary circuit takes power from the grid-connected inverter 100, and the control mode is not particularly limited. Optionally, the auxiliary loop power supply system is provided with a charging pile alternating current power supply change-over switch, one end of the charging pile alternating current power supply change-over switch is connected with the auxiliary loop, or the charging pile alternating current power supply change-over switch can be connected with the auxiliary loop through a second alternating current bus, and the other end of the charging pile alternating current power supply change-over switch can be selectively connected with a power grid at the power grid side or connected with the grid-connected inverter 100 at the inverter side; when the power grid is electrified, the server controls the alternating current power supply change-over switch of the charging pile to be switched to the power grid side; in the off-grid state, the server controls the charging pile alternating current power supply change-over switch to be switched to the inverter side. Alternatively, a connection switch may be provided inside the grid-connected inverter 100, and in the off-grid state, the load management server 400 controls the connection switch to be turned on so as to connect the grid-connected inverter 100 with the auxiliary circuit. Thus, grid-tied inverter 100 may receive direct current from photovoltaic panel 300 or energy storage battery system 200, and convert it to alternating current, such as mains frequency alternating current, and provide it to an associated auxiliary circuit that receives the alternating current from grid-tied inverter 100 to generate power. The AC/DC power module 430 may convert the alternating current from the grid-tied inverter 100 into direct current to supplement the electric vehicle with electrical energy. After the first switching power supply 410 is powered, the alternating current is converted into direct current, and the direct current is provided to the direct current electric equipment such as the control unit 420. The control unit 420 is configured to perform power distribution, electric energy metering, sequential charging control, and the like on the direct current output by the AC/DC power module 430 or the direct current transmitted by the energy storage battery system 200 through the charging pile direct current bus. The direct current charging pile can further comprise alternating current electric equipment such as an axial flow fan of a heat dissipation system, a water pump of the charging pile heat dissipation system and the like, and the axial flow fan of the heat dissipation system, the water pump of the charging pile heat dissipation system and the like can be connected with the same power supply of the auxiliary loop, for example, are connected with a second alternating current bus to be connected with the grid-connected inverter 100 at the inverter side. Therefore, in the off-grid state, the auxiliary circuit of the direct current charging pile can normally work after the grid-connected inverter 100 is powered on, and the charging pile starts to work.
Alternatively, in the off-grid state, if the grid-connected inverter 100 receives direct current of the photovoltaic panel 300; the grid-tie inverter 100 converts the direct current of the photovoltaic panel 300 into alternating current; otherwise, the grid-connected inverter 100 converts the dc power of the energy storage battery system 200 into ac power. The connection manner of the grid-connected inverter 100 and the photovoltaic panel 300 and the energy storage battery system 200 is not particularly limited. Alternatively, grid-tied inverter 100 is provided with a first selection switch that may receive a schedule from load management server 400 via a 4G/5G or other signal for selecting either the direct current of photovoltaic panel 300 or the direct current of energy storage battery system 200. Alternatively, the grid-connected inverter 100 or the energy storage battery system 200 is provided with a grid-connected control switch, which may accept the schedule from the load management server 400 through a 4G/5G signal or the like, for controlling whether to send the direct current of the energy storage battery system 200 to the grid-connected inverter 100.
Optionally, when the grid is powered, the load management server 400 controls the grid-connected inverter 100 to connect to the grid, and the grid-connected inverter 100 operates in a discharging mode-grid-connected mode to enable the power generated by the photovoltaic panel 300 to be reversely transmitted to the grid, or operates in a charging mode to enable the power of the grid to be stored to the energy storage battery system 200.
Optionally, when the grid is powered on, that is, the direct current charging pile receives electric energy from the grid, and when sunlight is sufficient, the load management server 400 controls the grid-connected inverter 100 to be connected with the grid, and the grid-connected inverter 100 works in a discharging mode-grid-connected mode, so that the generated electricity of the photovoltaic panel 300 is reversely transmitted to the grid, green electricity access can be realized, and station revenue can be improved.
Optionally, when the power grid is powered on and the electricity price is low, the load management server 400 controls the grid-connected inverter 100 to be connected to the power grid, and the grid-connected inverter 100 operates in a charging mode for storing the electric energy of the power grid to the energy storage battery system 200; when the power grid is powered on and the power price is high, the load management server 400 controls the grid-connected inverter 100 to be connected with the auxiliary circuit, and the grid-connected inverter 100 works in a discharging mode-grid-connected mode to convert direct current of the energy storage battery system 200 into alternating current, so that the auxiliary circuit works normally.
Optionally, when the power grid is powered on, if the SOC of the energy storage battery system 200 is smaller than the preset electric value, the load management server 400 controls the grid-connected inverter 100 to be connected to the power grid, and the grid-connected inverter 100 operates in a charging mode for storing electric energy of the power grid to the energy storage battery system 200; otherwise, the load management server 400 controls the grid-connected inverter 100 to be connected to the power grid, and the grid-connected inverter 100 operates in a discharging mode-grid-connected mode to reversely transfer the generated power of the photovoltaic panel 300 to the power grid.
Fig. 2 is a schematic structural diagram of a grid-connected inverter 100 of the auxiliary loop power supply system based on a small-sized light storage inverter according to an embodiment of the present invention.
Optionally, as shown in fig. 2, the grid-connected inverter 100 includes a photovoltaic panel interface 101, a maximum power point tracking control solar controller 102, an energy storage battery system interface 106, a bidirectional DC/DC Buck-Boost circuit 103, a bidirectional DC/AC rectifying circuit 104, and a second selection switch 105. The photovoltaic panel interface 101 is connected to a photovoltaic panel 300. The maximum power point tracking control solar controller 102 is connected to the photovoltaic panel interface 101 to monitor the power generation voltage of the photovoltaic panel 300 in real time, and adjust the output voltage of the photovoltaic panel 300 to make the photovoltaic panel 300 work at the maximum power. The energy storage battery system interface 106 is connected to the energy storage battery system 200. The maximum power point tracking control solar controller 102, the energy storage battery system interface 106 and the bidirectional DC/AC rectification circuit 104 are all connected with the bidirectional DC/DC Buck-Boost circuit 103, namely the bidirectional DC/DC Buck-Boost circuit 103 is used for setting direct current of corresponding voltage output by the maximum power point tracking control solar controller 102 or the energy storage battery system 200 into direct current of rated voltage or supplying the direct current rectified by a power grid to the energy storage battery in a step-up and step-down mode to supplement electric energy; the bidirectional DC/AC rectifying circuit 104 is used to invert the direct current of the rated voltage into an alternating current of the rated voltage, for example, 220V alternating current, or rectify the alternating current of the rated voltage, for example, 220V alternating current, into the direct current of the rated voltage. The first end of the second selection switch 105 is connected to the DC/AC rectifying circuit, and the second end of the second selection switch 105 is used for selecting one connection or not connection with the auxiliary circuit, the first configuration point of the power grid and the second configuration point of the power grid, so that the grid-connected inverter 100 operates in different operation modes. Optionally, the second selector switch 105 incorporates a communication chip to accept scheduling from the load management server 400 via 4G/5G or other signals.
When the second end of the second selection switch 105 is selected to be connected to the auxiliary circuit, the grid-connected inverter 100 works in a discharging mode, i.e. off-grid, and can be used in an off-grid state, and the grid-connected inverter 100 converts the direct current of the photovoltaic panel 300 or the energy storage battery system 200 into alternating current, so that the auxiliary circuit works normally. When the second end of the second selection switch 105 is selectively connected with the first configuration point of the power grid, the grid-connected inverter 100 works in a discharging mode-grid connection, and the load management server 400 can be used for controlling the grid-connected inverter 100 to be connected with the power grid when the power grid is electrified, and the photovoltaic panel 300 is connected with the power grid through the grid-connected inverter 100, so that the power generation of the photovoltaic panel 300 is used for being reversely transmitted to the power grid. When the second end of the second selection switch 105 is selectively connected to the second configuration point of the power grid, the grid-connected inverter 100 operates in a charging mode, and the load management server 400 can be used for controlling the grid-connected inverter 100 to be connected to the power grid when the power grid is electrified, and the battery energy storage system is connected to the power grid through the grid-connected inverter 100, so that the electric energy of the power grid is stored in the energy storage battery system 200.
Fig. 3 is a circuit connection diagram of an auxiliary loop power supply system based on a small-sized light storage inverter according to an embodiment of the present invention. The basic structure and principle of the auxiliary loop power supply system of the present embodiment and the technical effects thereof are the same as those of the embodiment of fig. 1, and for brevity, reference is made to the corresponding contents of the first embodiment where the description of the embodiment is not mentioned.
Optionally, as shown in fig. 3, the auxiliary loop power supply system is provided with a charging pile ac power supply change-over switch, one end of the charging pile ac power supply change-over switch is connected with the auxiliary loop, or the other end of the charging pile ac power supply change-over switch can be connected with a power grid on the power grid side or a grid-connected inverter 100 on the inverter side through a second ac bus; when the power grid is electrified, a server (such as a Cloud server Cloud) controls the alternating current power supply change-over switch of the charging pile to be switched to the power grid side; in the off-grid state, a server (e.g., cloud server Cloud) controls the ac power supply switch of the charging pile to switch to the inverter side.
Alternatively, as shown in fig. 3, the structure of the grid-connected inverter 100 may be the structure of the grid-connected inverter 100 shown in fig. 2.
Optionally, as shown in fig. 3, the power grid includes a power distribution cabinet, and the power distribution cabinet includes a third configuration point. The third configuration point can be connected with an auxiliary circuit of the direct current charging pile and provides rated alternating current voltage such as AC 220V, so that when the power grid is electrified, the auxiliary circuit can take power from the power grid, and the direct current charging pile works normally. Optionally, the power distribution cabinet further comprises a first configuration point and a second configuration point. When the third configuration point is connected to the auxiliary loop, if the first configuration point is available for selectively connecting to the grid-connected inverter 100 through the second end of the second selection switch 105, the load management server 400 controls the grid-connected inverter 100 to connect to the grid when the grid is powered, the grid-connected inverter 100 operates in the discharging mode-grid connection, and the photovoltaic panel 300 connects to the grid through the grid-connected inverter 100, so that the generated power of the photovoltaic panel 300 is used for being reversely transmitted to the grid. When the third configuration point is connected to the auxiliary circuit, if the second configuration point is available to be connected to the grid-connected inverter 100 through the second end of the second selection switch 105, the load management server 400 controls the grid-connected inverter 100 to be connected to the grid when the grid is powered, the grid-connected inverter 100 operates in the charging mode, and the battery energy storage system is connected to the grid through the grid-connected inverter 100, so that the electric energy of the grid is stored in the energy storage battery system 200.
Alternatively, as shown in fig. 3, the energy storage battery system 200 includes an energy storage cabinet grid-connected control switch 201 provided at the energy storage cabinet to accept scheduling from the load management server 400 through 4G/5G or the like signals for controlling whether to send direct current of the energy storage battery system 200 to the grid-connected inverter 100.
Alternatively, as shown in fig. 3, the energy storage battery system 200 includes a DC/DC transforming unit 204, which can be used to boost the direct current of the energy storage battery system 200, so that the charging loop for providing the direct current to the charging pile can supplement the electric vehicle with electric energy when the vehicle is in the off-line mode.
Optionally, as shown in fig. 3, the energy storage battery system 200 includes an energy storage cabinet charging control switch 202, where the energy storage cabinet charging control switch 202 is connected to the charging pile dc bus converging port to receive the dispatch from the load management server 400 through a 4G/5G signal, and then the load management server 400 can control whether to send the dc power of the energy storage battery system 200 to the charging pile dc bus, so that when the energy storage battery system is in the offline mode, the charging loop can provide the dc power to supplement the electric automobile through the charging pile dc bus.
Optionally, as shown in fig. 3, the energy storage battery system 200 includes an energy storage cabinet dc bus short-circuit protection fuse 203, which is disposed between the energy storage battery system 200 and the dc charging pile, so as to prevent the dc power provided by the energy storage battery system 200 from being too high to burn out the device when in the offline mode.
Optionally, as shown in fig. 3, the direct current charging pile includes a charging pile heat dissipation system axial flow fan and a charging pile heat dissipation system water pump, where the heat dissipation system axial flow fan and the charging pile heat dissipation system water pump can be connected with the same power supply set in the auxiliary circuit, for example, can be connected with a second alternating current bus (voltage AC 220V), so as to ensure that the power grid works normally in the electrified and off-grid state, so as to meet the high-power charging requirement.
Optionally, as shown in fig. 3, the dc charging pile further includes an auxiliary power source 440 and a main control board 450. The auxiliary power source 440 can be connected to the same power source as the auxiliary circuit, for example, can be connected to a second AC bus (voltage AC 220V), so as to ensure that the power grid works normally in both the electrified and off-grid states, and provide the power source voltage for the main control board 450. The main control board 450 may be connected to the load management server 400 and used for data collection, calculation, instruction output, etc.
Fig. 4 is a schematic diagram of a load management server 400 of an auxiliary loop power supply system based on a small-sized light storage inverter according to an embodiment of the present invention.
Alternatively, as shown in fig. 4, the load management server 400 includes a loop control switch 401, a second switching power supply 402, an uninterruptible power supply 403, a switch 404, a router 405, and a control board 406. The loop control switch 401 is connected with the second switching power supply 402; the uninterruptible power supply 403 is connected to the second switching power supply 402 to receive dc power from the second switching power supply 402; the switch 404, router 405 and control board 406 are all connected to the uninterruptible power supply 403. The switch 404 is connected to the control board 406, and the control board 406 is connected to the router 405 to perform data transmission and exchange.
Optionally, the load management server 400 may further include a surge protector 407, where the surge protector 407 is connected to the live and neutral wires of the auxiliary circuit, respectively, and has an excellent suppression effect on transient overvoltage, and performs overvoltage protection on the load management server 400.
Optionally, the load management server 400 may further include a fiber optic transceiver 408, the fiber optic transceiver 408 being disposed between the switch and the network power controller.
Fig. 5 is a flowchart illustrating a control method of an auxiliary loop power supply system based on a small-sized light storage inverter according to an embodiment of the present invention. As shown in fig. 5, the present embodiment further provides a control method of an auxiliary loop power supply system based on a small-sized light storage inverter, where the auxiliary loop power supply system based on the small-sized light storage inverter includes a dc charging pile, a photovoltaic panel 300, an energy storage battery system 200 and a grid-connected inverter 100; the direct current charging pile comprises an auxiliary loop, the auxiliary loop comprises a load management server 400, and the load management server 400 is used for feeding back power grid outage information to the server; both the photovoltaic panel 300 and the energy storage battery system 200 are connected to the grid-connected inverter 100; the control method comprises the following steps:
s110, judging whether the network is in an off-network state or not;
S120, if not, the auxiliary circuit takes electricity from the power grid;
and S130, if yes, the auxiliary circuit takes electricity from the grid-connected inverter 100, and the grid-connected inverter 100 converts direct current of the photovoltaic panel 300 or the energy storage battery system 200 into alternating current, so that the auxiliary circuit works normally.
The implementation of the control method of the auxiliary loop power supply system based on the small-sized light storage inverter provided in this embodiment can be referred to the embodiment of the auxiliary loop power supply system based on the small-sized light storage inverter, and the repetition is omitted.
Alternatively, the grid-tie inverter 100 converts direct current of the photovoltaic panel 300 or the energy storage battery system 200 into alternating current, including: in the off-grid state, judging whether the grid-connected inverter 100 receives direct current of the photovoltaic panel 300; if yes, the grid-connected inverter 100 converts the direct current of the photovoltaic panel 300 into alternating current; otherwise, the grid-connected inverter 100 converts the dc power of the energy storage battery system 200 into ac power.
Optionally, the control method further includes: when the power grid is electrified, judging whether the sunlight is sufficient or not; if yes, the load management server 400 controls the grid-connected inverter 100 to be connected with the power grid, and the grid-connected inverter 100 works in a discharging mode-grid-connected mode so as to reversely convey the power generated by the photovoltaic panel 300 to the power grid;
Or when the power grid is electrified, judging whether the electricity price is in a valley or not; if so, the load management server 400 controls the grid-connected inverter 100 to be connected with the power grid, the grid-connected inverter 100 works in a charging mode for storing the electric energy of the power grid into the energy storage battery system 200, if not, the load management server 400 controls the grid-connected inverter 100 to be connected with the auxiliary circuit, the grid-connected inverter 100 works in a discharging mode-grid-connected mode for converting the direct current of the energy storage battery system 200 into alternating current, and the auxiliary circuit works normally.
Optionally, the control method includes: when the power grid is electrified, judging whether the SOC of the energy storage battery system 200 is smaller than a preset electric quantity value or not; if so, the load management server 400 controls the grid-connected inverter 100 to be connected with the power grid, and the grid-connected inverter 100 operates in a charging mode for storing the electric energy of the power grid into the energy storage battery system 200; if not, the load management server 400 controls the grid-connected inverter 100 to be connected to the power grid, and the grid-connected inverter 100 operates in a discharging mode-grid-connected mode to reversely transfer the generated power of the photovoltaic panel 300 to the power grid.
Fig. 6 is a control flow diagram of an auxiliary loop power supply system based on a compact light storage inverter according to an embodiment of the invention. Referring to fig. 3 and 6, the control method of the present embodiment includes:
S201, judging whether electricity exists on the power grid side;
s202, if the power grid side has electricity, an alternating current power supply change-over switch works on the power grid side;
when the power grid on the power grid side is electrified, the alternating current power supply change-over switch 207 works on the power grid side, and all devices in the charging pile take electricity from the power grid side so as to meet the energy supplementing requirement of the electric automobile.
S203, starting to work by the charging pile;
s204, if the power grid side has electricity, judging whether the SOC of the energy storage battery system 200 is smaller than a preset electric quantity value, wherein the preset electric quantity value can be preferably but not limited to 80% of the total capacity;
s205, if the SOC of the energy storage battery system 200 is smaller than a preset electric quantity value, closing the energy storage cabinet grid-connected control switch 201;
s206, the second selection switch 105 switches to the charging mode;
the grid-side alternating current is converted into direct current in a rated voltage range through a bidirectional DC/AC rectifying circuit 104 and a bidirectional DC/DC Buck-Boost circuit 103 in the grid-connected inverter 100, and the direct current is stored in an energy storage battery.
S207, the energy storage battery system 200 starts charging until the SOC of the energy storage battery system 200 is not less than a preset electric quantity value, which may be preferably but not limited to 80% of the total capacity;
s208, if the SOC of the energy storage battery system 200 is greater than a preset electric quantity value, judging whether the photovoltaic panel interface 101 is electrified;
S209, if the photovoltaic panel interface 101 is powered on, the second selection switch 105 is switched to a discharging mode-grid connection;
s210, starting green power-on;
when the photovoltaic panel interface 101 is powered on, the sunlight is sufficient, the photovoltaic panel 300 works normally, the load management server 400 controls the grid-connected inverter 100 to be connected with a power grid, the grid-connected inverter 100 works in a discharging mode-grid connection, and variable direct current generated by the photovoltaic panel 300 is converted into mains frequency alternating current through the bidirectional DC/DC Buck-Boost circuit 103 and the bidirectional DC/AC rectifying circuit 104, and the power grid is used.
S211, if the photovoltaic panel interface 101 is not powered, judging that the sunlight is insufficient or the photovoltaic panel 300 is abnormal;
s212, the second selector switch 105 is opened, i.e. the auxiliary circuit and the grid are not connected.
S213, if the power grid side is powered off, the control board 406 issues a command;
s214, the grid-connected inverter 100 enters a discharging mode-off-grid;
when the power grid is cut off, the uninterruptible power supply 403 built in the load management server 400 can continue to provide the direct current voltage and current required by the work of the uninterruptible power supply in a short time, and meanwhile, the power grid cut-off information is fed back to the server. The server controls the alternating current power supply change-over switch to be switched to the inverter side, the grid-connected inverter 100 works in a discharging mode-off grid, and all devices in the charging pile take electricity from the inverter side.
S215, judging whether the photovoltaic panel interface 101 is powered;
s216, if the interface is powered on, the photovoltaic panel 300 is normal;
s217, keeping the energy storage cabinet grid-connected control switch 201 off;
s218, powering up an auxiliary circuit;
s219, the charging pile starts to work;
in the off-grid state, if the photovoltaic panel interface 101 is powered on, the energy storage cabinet grid-connected control switch 201 is turned off if the sunlight is sufficient, and the photovoltaic panel 300 performs ac-dc conversion through the grid-connected inverter 100 to provide ac power with commercial frequency for the charging pile.
S220, if the photovoltaic panel interface 101 is not powered, judging that the sunlight is insufficient or the photovoltaic panel 300 is abnormal;
s221, judging whether the SOC of the energy storage battery system 200 is greater than a second preset electric quantity value, wherein the second preset electric quantity value can be preferably but not limited to 20% of the total capacity;
s222, if the SOC of the energy storage battery system 200 is larger than a second preset electric quantity value, closing the energy storage cabinet grid-connected control switch 201;
s223, powering up an auxiliary circuit;
in the off-grid state, if the photovoltaic panel interface 101 is not powered, the energy storage battery system 200 may selectively provide the direct current when the SOC is greater than the second preset electrical value, and the grid-connected inverter 100 operates in the discharging mode, i.e. off-grid, to convert the direct current of the energy storage battery system 200 into the alternating current, so that the auxiliary circuit is powered.
S224, safety detection of a direct current bus;
s225, if the direct current bus is safe, closing the energy storage cabinet charging control switch 202;
s226, starting the charging pile to work;
the energy storage cabinet is connected to the charging stake dc bus, and the dc charging stake can continue to satisfy the high-power charging of the electric automobile using the power of the energy storage battery system 200.
S227, if the SOC of the energy storage battery system 200 is not greater than the second preset electric quantity value or the DC bus is unsafe, the charging is forbidden, and the step 201 is carried out again;
the energy storage battery system 200 cannot provide direct current, and accordingly, the energy storage cabinet grid-connected control switch 201 and the energy storage cabinet charging control switch 202 remain disconnected, and the determination of whether the ac side of step 201 is powered is performed again.
According to the auxiliary loop power supply system and the control method based on the small-sized light storage inverter, when the power grid is electrified, the auxiliary loop of the direct current charging pile can take power from the power grid; under the off-grid state, the auxiliary loop of the direct current charging pile can take electricity from the grid-connected inverter, and the grid-connected inverter converts direct current of the photovoltaic panel or the energy storage battery system into alternating current, so that the auxiliary loop works normally, and high-power charging of the electric automobile under the off-grid state can be realized. And moreover, the load management server can be internally provided with an uninterruptible power supply, so that the auxiliary loop can realize seamless switching of the power supply in an off-grid state, thereby obtaining electricity and working normally. In addition, the grid-connected inverter can be set to enter a discharging mode-grid connection, and the generated electricity of the photovoltaic panel is reversely transmitted to a power grid, so that green electricity networking can be realized, and station revenue is improved; or setting a charging mode, storing the electric energy of the power grid into an energy storage battery system, and releasing the electric energy to an auxiliary circuit for supplying power when the electric energy is off-grid or the electricity price is high.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the embodiments, the above examples and the accompanying drawings are exemplary, and the modules or processes in the drawings are not necessarily required to implement the embodiments of the present invention, and should not be construed as limiting the present invention, and various simple modifications and combinations of the technical solutions of the present invention may be made within the scope of the technical concept of the present invention, and all of the simple modifications and combinations are within the scope of the protection of the present invention.

Claims (10)

1. An auxiliary loop power supply system based on a small-sized light storage inverter is characterized by comprising a direct current charging pile, a photovoltaic panel (300), an energy storage battery system (200) and a grid-connected inverter (100);
the direct current charging pile comprises an auxiliary loop, wherein the auxiliary loop comprises a load management server (400), and the load management server (400) is used for feeding back power grid outage information to the server; the photovoltaic panel (300) and the energy storage battery system (200) are connected with the grid-connected inverter (100);
in an off-grid state, the auxiliary circuit takes electricity from the grid-connected inverter (100), and the grid-connected inverter (100) converts direct current of the photovoltaic panel (300) or the energy storage battery system (200) into alternating current, so that the auxiliary circuit works normally.
2. The auxiliary loop power system based on a compact light storage inverter of claim 1, further comprising a first ac bus and a second ac bus; the charging loop of the charging pile is connected with a power grid through the first alternating current bus and is used for supplementing electric energy for the electric automobile; the auxiliary circuit is connected with the second alternating current bus; when the power grid is electrified, the second alternating current bus is electrified from the power grid; in an off-grid state, the second ac bus draws power from the grid-tie inverter (100).
3. The auxiliary loop power supply system based on a small light storage inverter according to claim 1, wherein the load management server (400) controls the grid-connected inverter (100) to be connected to the power grid when the power grid is powered, the grid-connected inverter (100) operates in a discharging mode-grid-connected to make the power generation of the photovoltaic panel (300) for reverse transmission to the power grid, or operates in a charging mode to make the power of the power grid stored to the energy storage battery system (200).
4. A small light storage inverter based auxiliary loop power system according to claim 3, characterized in that the grid-connected inverter (100) comprises a photovoltaic panel interface (101), a maximum power point tracking control solar controller (102), an energy storage battery system interface (106), a bi-directional DC/DC Buck-Boost circuit (103), a bi-directional DC/AC rectifying circuit (104) and a second selection switch (105);
The photovoltaic panel interface (101) is connected with the photovoltaic panel (300); the maximum power point tracking control solar controller (102) is connected with the photovoltaic panel interface (101); the energy storage battery system interface (106) is connected with the energy storage battery system (200); the maximum power point tracking control solar controller (102), the energy storage battery system interface (106) and the bidirectional DC/AC rectification circuit (104) are connected with the bidirectional DC/DC Buck-Boost circuit (103); a first end of the second selection switch (105) is connected with the DC/AC rectification circuit, and a second end of the second selection switch (105) is used for selecting one connection or no connection with the auxiliary circuit, a first configuration point of a power grid and a second configuration point of the power grid.
5. The auxiliary loop power supply system based on a compact light storage inverter of claim 1, further comprising a charging stake dc bus; and under the off-grid state, connecting the charging pile direct current bus with the energy storage battery system (200), and receiving the direct current of the charging pile direct current bus by a charging loop of the charging pile so as to be used for supplementing electric energy for the electric automobile.
6. The auxiliary loop power system based on a small light storage inverter of claim 1, wherein the load management server (400) comprises a loop control switch (401), a second switching power supply (402), an uninterruptible power supply (403), a switch (404), a router (405), and a control board (406);
The loop control switch (401) is connected with the second switching power supply (402); the uninterruptible power supply (403) is connected with the second switching power supply (402) to receive direct current power supply of the second switching power supply (402); the switch (404), the router (405) and the control board (406) are all connected to the uninterruptible power supply (403).
7. The control method of the auxiliary loop power supply system based on the small-sized light storage inverter is characterized in that the auxiliary loop power supply system based on the small-sized light storage inverter comprises a direct current charging pile, a photovoltaic panel (300), an energy storage battery system (200) and a grid-connected inverter (100); the direct current charging pile comprises an auxiliary loop, wherein the auxiliary loop comprises a load management server (400), and the load management server (400) is used for feeding back power grid outage information to the server; the photovoltaic panel (300) and the energy storage battery system (200) are connected with the grid-connected inverter (100); the control method comprises the following steps:
judging whether the network is in an off-grid state or not;
if not, the auxiliary loop takes electricity from the power grid;
if yes, the auxiliary circuit takes electricity from the grid-connected inverter (100), and the grid-connected inverter (100) converts direct current of the photovoltaic panel (300) or the energy storage battery system (200) into alternating current, so that the auxiliary circuit works normally.
8. The control method of the auxiliary loop power supply system based on a small-sized light storage inverter according to claim 7, wherein the grid-connected inverter (100) converts direct current of the photovoltaic panel (300) or the energy storage battery system (200) into alternating current, comprising:
in an off-grid state, judging whether the grid-connected inverter (100) receives direct current of the photovoltaic panel (300);
if yes, the grid-connected inverter (100) converts direct current of the photovoltaic panel (300) into alternating current; otherwise, the grid-connected inverter (100) converts the direct current of the energy storage battery system (200) into alternating current.
9. The method for controlling an auxiliary loop power supply system based on a small-sized light storage inverter according to claim 7, comprising:
when the power grid is electrified, judging whether the sunlight is sufficient or not; if yes, the load management server (400) controls the grid-connected inverter (100) to be connected with the power grid, and the grid-connected inverter (100) works in a discharging mode-grid connection so as to reversely convey the power generation of the photovoltaic panel (300) to the power grid;
or when the power grid is electrified, judging whether the electricity price is in a valley or not; if yes, the load management server (400) controls the grid-connected inverter (100) to be connected with the power grid, the grid-connected inverter (100) works in a charging mode and is used for storing electric energy of the power grid to the energy storage battery system (200), if not, the load management server (400) controls the grid-connected inverter (100) to be connected with the auxiliary circuit, the grid-connected inverter (100) works in a discharging mode-grid-connected mode and converts direct current of the energy storage battery system (200) into alternating current, and the auxiliary circuit works normally.
10. The method for controlling an auxiliary loop power supply system based on a small-sized light storage inverter according to claim 7, comprising:
when the power grid is electrified, judging whether the SOC of the energy storage battery system (200) is smaller than a preset electric quantity value or not;
if yes, the load management server (400) controls the grid-connected inverter (100) to be connected with the power grid, and the grid-connected inverter (100) works in a charging mode for storing electric energy of the power grid to the energy storage battery system (200);
if not, the load management server (400) controls the grid-connected inverter (100) to be connected with the power grid, and the grid-connected inverter (100) works in a discharging mode-grid connection so as to reversely convey the power generation of the photovoltaic panel (300) to the power grid.
CN202310715179.8A 2023-06-15 2023-06-15 Auxiliary loop power supply system based on small light storage inverter and control method Pending CN117048401A (en)

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CN109167377A (en) * 2018-10-09 2019-01-08 上海博阳新能源科技股份有限公司 Electric charging station system is stored up using the light of battery based on echelon
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