CN116599192B - Photovoltaic off-grid, commercial network and energy storage hybrid power supply system - Google Patents

Photovoltaic off-grid, commercial network and energy storage hybrid power supply system Download PDF

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Publication number
CN116599192B
CN116599192B CN202310870427.6A CN202310870427A CN116599192B CN 116599192 B CN116599192 B CN 116599192B CN 202310870427 A CN202310870427 A CN 202310870427A CN 116599192 B CN116599192 B CN 116599192B
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China
Prior art keywords
module
mos tube
voltage
switch
power supply
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CN202310870427.6A
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Chinese (zh)
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CN116599192A (en
Inventor
高立明
秦程
宋永辉
赵璐
孟营营
刘磊
董亮
张向峰
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State Power Investment Group Cangzhou New Energy Power Generation Co ltd
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State Power Investment Group Cangzhou New Energy Power Generation Co ltd
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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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • 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
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • 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
    • 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

Abstract

The invention discloses a photovoltaic grid-connected, city grid and energy storage hybrid power supply system, which relates to the field of power supply and comprises the following components: the photovoltaic power supply module is used for converting solar energy into electric energy and outputting the electric energy to the first voltage detection module; compared with the prior art, the invention has the beneficial effects that: according to the invention, the charge and discharge control module is arranged, so that the charge rate of the battery storage module can be changed along with the output voltage of the photovoltaic power supply module; the MOS tube is used as a switch of the charge-discharge control module, so that the damage caused by frequent opening and closing is avoided; the MOS tube is used as a switch, when the switch is closed and opened, the voltage flowing through the MOS tube is smaller, and the large current generated when the switch is closed and opened is reduced; the voltage output module is arranged, so that the output voltage is stable, meanwhile, the power supply delay is built, and the voltage is stable in the power supply switching process of the photovoltaic power supply module, the battery storage module and the mains supply module.

Description

Photovoltaic off-grid, commercial network and energy storage hybrid power supply system
Technical Field
The invention relates to the field of power supply, in particular to a photovoltaic grid-connected and city grid and energy storage hybrid power supply system.
Background
The photovoltaic grid-connected power supply comprises grid-connected power supply and grid-connected power supply, and the grid-connected power supply comprises grid-connected power supply and grid-connected power supply: the electric energy generated by the photovoltaic power supply is fused with the city network through the grid-connected inverter to supply power to the load; off-grid power supply: the electric energy generated by the photovoltaic power supply is isolated from the commercial network to independently supply power to the load.
In the photovoltaic power supply process, the photovoltaic power supply is overlarge, and at the moment, partial electric energy is stored through an energy storage battery, so that the energy storage battery supplies power for a load when the photovoltaic power supply is insufficient, and the light energy is fully utilized.
In the existing photovoltaic power supply process, the energy storage battery is charged through a switch, namely the switch is not charged after being opened, the switch is fully charged after being closed, when the photovoltaic power supply output voltage fluctuates around the required voltage for starting the switch, the switch can be frequently closed and opened, the switch is easy to damage, and improvement is needed.
Disclosure of Invention
The invention aims to provide a photovoltaic grid-connected/off-grid, commercial network and energy storage hybrid power supply system so as to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a photovoltaic off-grid, utility grid and energy storage hybrid power supply system comprising:
the photovoltaic power supply module is used for converting solar energy into electric energy and outputting the electric energy to the first voltage detection module;
the first voltage detection module is used for detecting the magnitude of the input voltage and controlling whether the charge-discharge control module is conducted or not and the degree of conduction according to the magnitude of the input voltage; supplying power to the voltage output module;
the charge-discharge control module is used for setting two conducting circuits, one conducting circuit outputs the voltage of the first voltage detection module to the bidirectional DC conversion module, and the other conducting circuit outputs the voltage of the bidirectional DC conversion module to the first voltage detection module;
the bidirectional DC conversion module is used for charging the battery storage module after direct-current conversion of the voltage output by the first voltage detection module; or the voltage output by the battery storage module is converted into direct current and then is supplied to the voltage output module;
the battery storage module is used for storing or outputting electric energy;
the voltage output module is used for providing stable direct current for the DC-AC conversion module; the voltage is stabilized in the power supply switching process of the photovoltaic power supply module, the battery storage module and the mains supply module;
the DC-AC conversion module is used for converting direct current into alternating current and outputting the alternating current to the bus load working module;
the bus load working module is used for loading power;
the second voltage detection module is used for detecting the output voltage of the first voltage detection module, and when the voltage is lower than a threshold value, a loop of the mains supply module and the bus load working module is constructed;
a mains power module for providing 220V ac power to the bus load operation module;
the output end of the photovoltaic power supply module is connected with the first input end of the first voltage detection module, the output end of the first voltage detection module is connected with the first input end of the charge-discharge control module, the input end of the voltage output module and the input end of the second voltage detection module, the first output end of the charge-discharge control module is connected with the first input end of the bidirectional DC conversion module, the first output end of the bidirectional DC conversion module is connected with the input end of the battery storage module, the output end of the battery storage module is connected with the second input end of the bidirectional DC conversion module, the second output end of the bidirectional DC conversion module is connected with the second input end of the charge-discharge control module, the output end of the voltage output module is connected with the input end of the DC-AC conversion module, the output end of the DC-AC conversion module is connected with the first input end of the bus load working module, the output end of the second voltage detection module is connected with the second input end of the bus load working module, and the output end of the commercial power module is connected with the third input end of the bus load working module.
As still further aspects of the invention: the first voltage detection module comprises a first resistor, a first capacitor, a second resistor, a first diode, a second diode, a third resistor, a first triode, a second MOS tube and a third diode, one end of the first resistor is connected with the output end of the photovoltaic power supply module, the other end of the first resistor is connected with one end of the first capacitor, one end of the second resistor and the positive electrode of the third diode, the other end of the second resistor is connected with the negative electrode of the first diode, the positive electrode of the second diode and one end of the third resistor, the other end of the third resistor is grounded, the positive electrode of the first diode is connected with the first input end of the charge-discharge control module, the negative electrode of the third diode is connected with the input end of the voltage output module and the input end of the second voltage detection module, the negative electrode of the second diode is connected with the base electrode of the first triode, the emitter of the first triode is connected with the G electrode of the second MOS tube, the collector electrode of the first triode is connected with the S electrode of the second MOS tube and the 5V voltage, and the D electrode of the second MOS tube is connected with the first input end of the charge-discharge control module.
As still further aspects of the invention: the charge-discharge control module comprises a third MOS tube and a fourth MOS tube, wherein the G electrode of the third MOS tube is connected with the first output end of the first voltage detection module, the G electrode of the fourth MOS tube is connected with the first output end of the first voltage detection module, the D electrode of the third MOS tube is connected with the S electrode of the fourth MOS tube and the second input end of the first voltage detection module, the S electrode of the third MOS tube is connected with the first input end of the bidirectional DC conversion module, and the D electrode of the fourth MOS tube is connected with the second output end of the bidirectional DC conversion module.
As still further aspects of the invention: the voltage output module comprises a sixth resistor, a seventh triode, an eighth triode, a first inductor and a second capacitor, wherein one end of the sixth resistor is connected with a collector of the seventh triode, a collector of the eighth triode and an output end of the first voltage detection module, the other end of the sixth resistor is connected with a base of the seventh triode, an emitter of the seventh triode is connected with a base of the eighth triode, an emitter of the eighth triode is connected with one end of the first inductor, the other end of the first inductor is connected with one end of the second capacitor and an input end of the DC-AC module, and the other end of the second capacitor is grounded.
As still further aspects of the invention: the DC-AC conversion module comprises a ninth MOS tube, a tenth MOS tube, an eleventh MOS tube, a twelfth MOS tube and a transformer, wherein the D electrode of the ninth MOS tube is connected with the D electrode of the tenth MOS tube and the output end of the voltage output module, the S electrode of the ninth MOS tube is connected with one end of the input end of the transformer and the D electrode of the eleventh MOS tube, the S electrode of the tenth MOS tube is connected with the other end of the input end of the transformer and the D electrode of the twelfth MOS tube, the output end of the transformer is connected with the first input end of the bus load working module, the S electrode of the eleventh MOS tube is grounded, the S electrode of the twelfth MOS tube is grounded, the G electrode of the ninth MOS tube is connected with the G electrode of the twelfth MOS tube and PWM signals, and the G electrode of the tenth MOS tube is connected with the G electrode of the eleventh MOS tube and PWM signals.
As still further aspects of the invention: the bus load working module comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch and a load, wherein one end of the first switch is connected with one end of the fifth switch and the output end of the DC-AC module, one end of the second switch is connected with one end of the sixth switch and the output end of the DC-AC module, the other end of the first switch is connected with the other end of the fifth switch, one end of the third switch and one end of the load, the other end of the load is connected with the other end of the second switch, the other end of the sixth switch and one end of the fourth switch, the other end of the third switch is connected with the output end of the mains supply module, and the other end of the fourth switch is connected with the output end of the mains supply module.
As still further aspects of the invention: the second voltage detection module comprises a fourth resistor, a fifth resistor, a fourth diode, a fifth triode, a relay, a fifth diode and a sixth MOS tube, one end of the fourth resistor is connected with the output end of the first voltage detection module, the other end of the fourth resistor is connected with one end of the fifth resistor and the negative electrode of the fourth diode, the other end of the fifth resistor is grounded, the positive electrode of the fourth diode is connected with the base electrode of the fifth triode, the collector electrode of the fifth triode is connected with one end of the relay, the negative electrode of the fifth diode and 5V voltage, the emitter electrode of the fifth triode is connected with the G electrode of the sixth MOS tube, the D electrode of the sixth MOS tube is grounded, and the S electrode of the sixth MOS tube is connected with the other end of the relay and the positive electrode of the fifth diode.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the charge and discharge control module is arranged, so that the charge rate of the battery storage module can be changed along with the output voltage of the photovoltaic power supply module; the MOS tube is used as a switch of the charge-discharge control module, so that the damage caused by frequent opening and closing is avoided; the MOS tube is used as a switch, when the switch is closed and opened, the voltage flowing through the MOS tube is smaller, and the large current generated when the switch is closed and opened is reduced; the voltage output module is arranged, so that the output voltage is stable, meanwhile, the power supply delay is built, and the voltage is stable in the power supply switching process of the photovoltaic power supply module, the battery storage module and the mains supply module.
Drawings
Fig. 1 is a schematic diagram of a photovoltaic off-grid, utility grid and energy storage hybrid power supply system.
Fig. 2 is a first partial circuit diagram of a photovoltaic off-grid, on-grid and energy storage hybrid power supply system.
Fig. 3 is a second partial circuit diagram of a photovoltaic off-grid, on-grid and energy storage hybrid power supply system.
Fig. 4 is a third partial circuit diagram of a photovoltaic off-grid, on-grid and energy storage hybrid power supply system.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present invention are included in the protection scope of the present invention.
Referring to fig. 1, a photovoltaic grid-connected, commercial network and energy storage hybrid power supply system includes:
the photovoltaic power supply module 1 is used for converting solar energy into electric energy and outputting the electric energy to the first voltage detection module 2;
the first voltage detection module 2 is used for detecting the magnitude of the input voltage and controlling whether the charge and discharge control module 3 is conducted or not and the degree of conduction according to the magnitude of the input voltage; supplying power to the voltage output module 6;
the charge-discharge control module 3 is used for setting two conducting lines, one conducting line outputs the voltage of the first voltage detection module 2 to the bidirectional DC conversion module 4, and the other conducting line outputs the voltage of the bidirectional DC conversion module 4 to the first voltage detection module 2;
the bidirectional DC conversion module 4 is used for charging the battery storage module 5 after direct-current conversion of the voltage output by the first voltage detection module 2; or the voltage output by the battery storage module 5 is subjected to direct current conversion and then is supplied to the voltage output module 6;
a battery storage module 5 for storing or outputting electric energy;
a voltage output module 6 for providing a stable direct current for the DC-AC conversion module 7; the voltage is stabilized in the power supply switching process of the photovoltaic power supply module 1, the battery storage module 5 and the mains supply module 10;
the DC-AC conversion module 7 is used for converting direct current into alternating current and outputting the alternating current to the bus load working module 8;
the bus load working module 8 is used for the power-on work of the load X;
the second voltage detection module 9 is configured to detect an output voltage of the first voltage detection module 2, and when the voltage is lower than a threshold value, construct a loop of the mains power supply module 10 and the bus load working module 8;
a mains power module 10 for providing 220V ac power to the bus load operation module 8;
the output end of the photovoltaic power supply module 1 is connected with the first input end of the first voltage detection module 2, the output end of the first voltage detection module 2 is connected with the first input end of the charge-discharge control module 3, the input end of the voltage output module 6 and the input end of the second voltage detection module 9, the first output end of the charge-discharge control module 3 is connected with the first input end of the bidirectional DC conversion module 4, the first output end of the bidirectional DC conversion module 4 is connected with the input end of the battery storage module 5, the output end of the battery storage module 5 is connected with the second input end of the bidirectional DC conversion module 4, the second output end of the bidirectional DC conversion module 4 is connected with the second input end of the charge-discharge control module 3, the second output end of the charge-discharge control module 3 is connected with the second input end of the first voltage detection module 2, the output end of the voltage output module 6 is connected with the input end of the DC-to-AC module 7, the output end of the DC-to-AC module 7 is connected with the first input end of the bus load work module 8, the output end of the second voltage detection module 9 is connected with the second input end of the bus load work module 8, and the output end of the commercial power supply module 10 is connected with the third input end of the bus work module 8.
In particular embodiments: referring to fig. 4, the mains power module 10 includes a live line L and a neutral line N, through which 220V ac power is output to the bus load operation module 8.
In this embodiment: referring to fig. 2, the first voltage detection module 2 includes a first resistor R1, a first capacitor C1, a second resistor R2, a first diode D1, a second diode D2, a third resistor R3, a first triode V1, a second MOS tube V2, and a third diode D3, wherein one end of the first resistor R1 is connected to the output end of the photovoltaic power supply module 1, the other end of the first resistor R1 is connected to one end of the first capacitor C1, one end of the second resistor R2, the positive electrode of the third diode D3, the other end of the second resistor R2 is connected to the negative electrode of the first diode D1, the positive electrode of the second diode D2, one end of the third resistor R3, the other end of the third resistor R3 is grounded, the positive electrode of the first diode D1 is connected to the first input end of the charge/discharge control module 3, the negative electrode of the third diode D3 is connected to the input end of the voltage output module 6, the input end of the second voltage detection module 9, the negative electrode of the second diode D2 is connected to one end of the first capacitor C1, the negative electrode of the second diode V1 is connected to the negative electrode of the first triode V1, the positive electrode of the second diode V2 is connected to the negative electrode of the second triode V2 is connected to the first triode V2.
The photovoltaic power supply module 1 outputs electric energy converted by solar energy, the voltage is the sum of the voltages of the first resistor R1, the second resistor R2 and the third resistor R3, the first diode D1 is a voltage-stabilizing diode, the second diode D2 is a current-limiting diode, when the voltage supply of the photovoltaic power supply module 1 is at an intermediate value, the first diode D1 is not conducted, the second diode D2 is conducted, the charge and discharge control module 3 is not driven to work, and the voltage is output to a later-stage circuit through the first resistor R1;
when the voltage supplied by the photovoltaic power supply module 1 is at a higher value, the first diode D1 is conducted, the second diode D2 is conducted, the charge-discharge control module 3 is driven to work, the battery storage module 5 is charged through the charge-discharge control module 3 and the bidirectional DC conversion module 4, and meanwhile, the voltage is output to a later-stage circuit through the first resistor R1;
when the voltage supplied by the photovoltaic power supply module 1 is at a lower value, the first diode D1 is not conducted, the second diode D2 is not conducted (the current-limiting diode is 0.7V voltage drop), the first triode V1 is cut off, the G of the second MOS tube V2 (PMOS) is extremely low in level, the second MOS tube V2 is conducted, the charge and discharge control module 3 is driven to work, and the battery storage module 5 outputs voltage through the bidirectional DC conversion module 4 and the charge and discharge control module 3 to supply power for a later-stage circuit.
In another embodiment: the third diode D3 may be omitted, and the third diode D3 is used to prevent the photovoltaic power module 1 from being reversely powered when the battery storage module 5 is powered.
In this embodiment: referring to fig. 2, the charge-discharge control module 3 includes a third MOS tube V3 and a fourth MOS tube V4, wherein a G electrode of the third MOS tube V3 is connected to the first output end of the first voltage detection module 2, a G electrode of the fourth MOS tube V4 is connected to the first output end of the first voltage detection module 2, a D electrode of the third MOS tube V3 is connected to an S electrode of the fourth MOS tube V4 and the second input end of the first voltage detection module 2, an S electrode of the third MOS tube V3 is connected to the first input end of the bidirectional DC conversion module 4, and a D electrode of the fourth MOS tube V4 is connected to the second output end of the bidirectional DC conversion module 4.
When the first diode D1 is conducted, the common point B is high level, the third MOS tube V3 (NMOS) is driven to conduct, the voltage charges the battery storage module 5 through the third MOS tube V3 and the bidirectional DC conversion module 4, and the conducting degree of the third MOS tube V3 is changed along with the output voltage of the photovoltaic power supply module 1 so as to change the voltage output to the battery storage module 5, and the power stability output to a rear-stage circuit is effectively ensured;
when the second diode D2 is turned off, the common point C is high level, and drives the fourth MOS transistor V4 (NMOS) to be turned on, and the battery storage module 5 supplies power to the later stage circuit through the bidirectional DC conversion module 4 and the fourth MOS transistor V4.
Because the conduction degree of the MOS tube is limited by voltage, the current flowing when the third MOS tube V3 and the fourth MOS tube V4 are conducted or cut off is smaller, so that the generation of large current is avoided when the battery storage module 5 is switched to charge and supply power, and the power supply safety is ensured; and the MOS tube can adapt to frequent start and stop as a switching tube.
In another embodiment: the MOS transistors may be replaced with other types of switching transistors.
In this embodiment: referring to fig. 3, the voltage output module 6 includes a sixth resistor R6, a seventh triode V7, an eighth triode V8, a first inductor L1, and a second capacitor C2, wherein one end of the sixth resistor R6 is connected to the collector of the seventh triode V7, the collector of the eighth triode V8, and the output end of the first voltage detection module 2, the other end of the sixth resistor R6 is connected to the base of the seventh triode V7, the emitter of the seventh triode V7 is connected to the base of the eighth triode V8, the emitter of the eighth triode V8 is connected to one end of the first inductor L1, the other end of the first inductor L1 is connected to one end of the second capacitor C2, the input end of the DC-AC module 7, and the other end of the second capacitor C2 is grounded.
When voltage is input, the seventh triode V7 is triggered to be conducted through the sixth resistor R6, the eighth triode V8 is triggered to be conducted through the seventh triode V7, and the voltage is output to a later-stage circuit through the first inductor L1 and the second capacitor C2; the sixth resistor R6, the seventh triode V7 and the eighth triode V8 form an adjusting circuit, so that the input voltage outputs stable voltage through the adjusting circuit, and voltage fluctuation is avoided; and the inductance current is not suddenly changed, and the capacitance voltage is not suddenly changed, so that the circuit ensures stable voltage in the power supply switching process of the photovoltaic power supply module 1, the battery storage module 5 and the mains supply module 10.
In another embodiment: a resistor may be added to reduce the current output to the subsequent stage.
In this embodiment: referring to fig. 4, the dc-AC conversion module 7 includes a ninth MOS transistor V9, a tenth MOS transistor V10, an eleventh MOS transistor V11, a twelfth MOS transistor V12, and a transformer W, wherein the D pole of the ninth MOS transistor V9 is connected to the D pole of the tenth MOS transistor V10, the output end of the voltage output module 6, the S pole of the ninth MOS transistor V9 is connected to one end of the input end of the transformer W, the D pole of the eleventh MOS transistor V11, the S pole of the tenth MOS transistor V10 is connected to the other end of the input end of the transformer W, the D pole of the twelfth MOS transistor V12, the output end of the transformer W is connected to the first input end of the bus load operation module 8, the S pole of the eleventh MOS transistor V11 is grounded, the G pole of the ninth MOS transistor V9 is connected to the G pole of the twelfth MOS transistor V12, the PWM signal, and the G pole of the tenth MOS transistor V10 is connected to the G pole of the eleventh MOS transistor V11.
The PWM signals received by the ninth MOS transistor V9, the twelfth MOS transistor V12, the tenth MOS transistor V10, and the eleventh MOS transistor V11 are complementary PWM signals with a duty ratio of 50% (i.e., PWM1 and PWM2 in fig. 4 are complementary PWM signals with a duty ratio of 50%), so that when the ninth MOS transistor V9 and the twelfth MOS transistor V12 are turned on, the tenth MOS transistor V10 and the eleventh MOS transistor V11 are turned off, and when the tenth MOS transistor V10 and the eleventh MOS transistor V11 are turned on, the ninth MOS transistor V9 and the twelfth MOS transistor V12 are turned off; so that an alternating current is formed at the input end of the transformer W, amplified by the transformer W and output to the bus load working module 8.
In another embodiment: the MOS transistors may be replaced by other types of switching transistors.
In this embodiment: referring to fig. 4, the bus load working module 8 includes a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, a fifth switch S5, a sixth switch S6, and a load X, wherein one end of the first switch S1 is connected to one end of the fifth switch S5 and an output end of the DC-AC conversion module 7, one end of the second switch S2 is connected to one end of the sixth switch S6 and an output end of the DC-AC conversion module 7, the other end of the first switch S1 is connected to the other end of the fifth switch S5, one end of the third switch S3, and one end of the load X, the other end of the load X is connected to the other end of the second switch S2, the other end of the sixth switch S6, and one end of the fourth switch S4, the other end of the third switch S3 is connected to an output end of the mains power module 10, and the other end of the fourth switch S4 is connected to an output end of the mains power module 10.
The fifth switch S5 and the sixth switch S6 are normally open, form a photovoltaic grid connection when closed, and form a photovoltaic off-grid when open; when the voltage supply of the photovoltaic power supply module 1 is at an intermediate value or a higher value, the photovoltaic power supply module 1 supplies power, and finally, the power is supplied through the DC-AC conversion module 7; when the voltage of the photovoltaic power supply module 1 is at a lower value and the power supply voltage of the battery storage module 5 is sufficient, the power is finally supplied through the DC-AC conversion module 7, under the condition, the first switch S1 and the second switch S2 are closed, and the third switch S3 and the fourth switch S4 are sprung; when the voltage of the photovoltaic power supply module 1 is at a lower value and the power supply voltage of the battery storage module 5 is insufficient, the second voltage detection module 9 drives the first switch S1 and the second switch S2 to be sprung open, and the third switch S3 and the fourth switch S4 are closed and are powered by the mains supply. The fifth switch S5 and the sixth switch S6 are controlled by related control circuits, which are in the prior art and are not described herein.
In another embodiment: the fifth switch S5 and the sixth switch S6 may be manually controlled.
In this embodiment: referring to fig. 2, the second voltage detection module 9 includes a fourth resistor R4, a fifth resistor R5, a fourth diode D4, a fifth triode V5, a relay J1, a fifth diode D5, and a sixth MOS tube V6, one end of the fourth resistor R4 is connected to the output end of the first voltage detection module 2, the other end of the fourth resistor R4 is connected to one end of the fifth resistor R5, the negative electrode of the fourth diode D4, the other end of the fifth resistor R5 is grounded, the positive electrode of the fourth diode D4 is connected to the base of the fifth triode V5, the collector of the fifth triode V5 is connected to one end of the relay J1, the negative electrode of the fifth diode D5, and 5V voltage, the emitter of the fifth triode V5 is connected to the G electrode of the sixth MOS tube V6, the D electrode of the sixth MOS tube V6 is grounded, and the S electrode of the sixth MOS tube V6 is connected to the other end of the relay J1, and the positive electrode of the fifth diode D5.
When the photovoltaic power supply module 1 or the battery storage module 5 is sufficient in power supply, the voltage at the common point A is normal, at the moment, the fourth diode D4 (voltage stabilizing diode) is conducted, the fifth triode V5 is conducted, the sixth MOS tube V6 (PMOS) is cut off, and the relay J1 does not work; when the power supply of the photovoltaic power supply module 1 or the battery storage module 5 is insufficient, the sixth MOS tube V6 is conducted, the relay J1 is powered on to work, the first switch S1 and the second switch S2 are controlled to be sprung open, and the third switch S3 and the fourth switch S4 are controlled to be closed.
In another embodiment: the fifth resistor R5 may be replaced with a potentiometer to regulate the voltage at the common point a that triggers the operation of the relay J1.
The working principle of the invention is as follows: the photovoltaic power supply module 1 is used for converting solar energy into electric energy and outputting the electric energy to the first voltage detection module 2; the first voltage detection module 2 is used for detecting the magnitude of input voltage and controlling whether the charge-discharge control module 3 is conducted or not and the degree of conduction according to the magnitude of the input voltage; supplying power to the voltage output module 6; the charge-discharge control module 3 is used for setting two conducting lines, one conducting line outputs the voltage of the first voltage detection module 2 to the bidirectional DC conversion module 4, and the other conducting line outputs the voltage of the bidirectional DC conversion module 4 to the first voltage detection module 2; the bidirectional DC conversion module 4 is used for charging the battery storage module 5 after direct-current conversion of the voltage output by the first voltage detection module 2; or the voltage output by the battery storage module 5 is subjected to direct current conversion and then is supplied to the voltage output module 6; the battery storage module 5 is used for storing or outputting electric energy; the voltage output module 6 is used for providing stable direct current for the DC-AC conversion module 7; the voltage is stabilized in the power supply switching process of the photovoltaic power supply module 1, the battery storage module 5 and the mains supply module 10; the DC-AC conversion module 7 is used for converting direct current into alternating current and outputting the alternating current to the bus load working module 8; the bus load working module 8 is used for working the load X power-on work; the second voltage detection module 9 is configured to detect an output voltage of the first voltage detection module 2, and when the voltage is lower than a threshold value, construct a loop of the mains power module 10 and the bus load working module 8; the mains power module 10 is arranged to provide 220V ac power to the bus load operation module 8.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (5)

1. A photovoltaic off-grid, commercial network and energy storage hybrid power supply system is characterized in that:
the photovoltaic off-grid, commercial network and energy storage hybrid power supply system comprises:
the photovoltaic power supply module is used for converting solar energy into electric energy and outputting the electric energy to the first voltage detection module;
the first voltage detection module is used for detecting the magnitude of the input voltage and controlling whether the charge-discharge control module is conducted or not and the degree of conduction according to the magnitude of the input voltage; supplying power to the voltage output module;
the charge-discharge control module is used for setting two conducting circuits, one conducting circuit outputs the voltage of the first voltage detection module to the bidirectional DC conversion module, and the other conducting circuit outputs the voltage of the bidirectional DC conversion module to the first voltage detection module;
the bidirectional DC conversion module is used for charging the battery storage module after direct-current conversion of the voltage output by the first voltage detection module; or the voltage output by the battery storage module is converted into direct current and then is supplied to the voltage output module;
the battery storage module is used for storing or outputting electric energy;
the voltage output module is used for providing stable direct current for the DC-AC conversion module; the voltage is stabilized in the power supply switching process of the photovoltaic power supply module, the battery storage module and the mains supply module;
the DC-AC conversion module is used for converting direct current into alternating current and outputting the alternating current to the bus load working module;
the bus load working module is used for loading power;
the second voltage detection module is used for detecting the output voltage of the first voltage detection module, and when the voltage is lower than a threshold value, a loop of the mains supply module and the bus load working module is constructed;
a mains power module for providing 220V ac power to the bus load operation module;
the output end of the photovoltaic power supply module is connected with the first input end of the first voltage detection module, the output end of the first voltage detection module is connected with the first input end of the charge-discharge control module, the input end of the voltage output module and the input end of the second voltage detection module, the first output end of the charge-discharge control module is connected with the first input end of the bidirectional DC conversion module, the first output end of the bidirectional DC conversion module is connected with the input end of the battery storage module, the output end of the battery storage module is connected with the second input end of the bidirectional DC conversion module, the second output end of the bidirectional DC conversion module is connected with the second input end of the charge-discharge control module, the output end of the voltage output module is connected with the input end of the DC-AC conversion module, the output end of the DC-AC conversion module is connected with the first input end of the bus load working module, the output end of the second voltage detection module is connected with the second input end of the bus load working module, and the output end of the commercial power module is connected with the third input end of the bus load working module;
the charge-discharge control module comprises a third MOS tube and a fourth MOS tube, wherein the G electrode of the third MOS tube is connected with the first output end of the first voltage detection module, the G electrode of the fourth MOS tube is connected with the first output end of the first voltage detection module, the D electrode of the third MOS tube is connected with the S electrode of the fourth MOS tube and the second input end of the first voltage detection module, the S electrode of the third MOS tube is connected with the first input end of the bidirectional DC conversion module, and the D electrode of the fourth MOS tube is connected with the second output end of the bidirectional DC conversion module;
the voltage output module comprises a sixth resistor, a seventh triode, an eighth triode, a first inductor and a second capacitor, wherein one end of the sixth resistor is connected with a collector of the seventh triode, a collector of the eighth triode and an output end of the first voltage detection module, the other end of the sixth resistor is connected with a base of the seventh triode, an emitter of the seventh triode is connected with a base of the eighth triode, an emitter of the eighth triode is connected with one end of the first inductor, the other end of the first inductor is connected with one end of the second capacitor and an input end of the DC-AC module, and the other end of the second capacitor is grounded.
2. The photovoltaic grid-connected, mains supply and energy storage hybrid power supply system according to claim 1, wherein the first voltage detection module comprises a first resistor, a first capacitor, a second resistor, a first diode, a second diode, a third resistor, a first triode, a second MOS tube and a third diode, one end of the first resistor is connected with the output end of the photovoltaic power supply module, the other end of the first resistor is connected with one end of the first capacitor, one end of the second resistor and the positive electrode of the third diode, the other end of the second resistor is connected with the negative electrode of the first diode, the positive electrode of the second diode and one end of the third resistor, the other end of the third resistor is grounded, the positive electrode of the first diode is connected with the first input end of the charge-discharge control module, the negative electrode of the third diode is connected with the input end of the voltage output module, the input end of the second voltage detection module, the negative electrode of the second diode is connected with the base electrode of the first triode, the emitter of the first triode is connected with the G electrode of the second MOS tube, the collector of the first triode is connected with the S electrode of the second MOS tube, the collector electrode of the second MOS tube is connected with the S electrode of the second MOS tube, and the second MOS electrode is connected with the D electrode of the charge-discharge control module.
3. The photovoltaic grid-connected, commercial network and energy storage hybrid power supply system according to claim 1, wherein the DC-AC conversion module comprises a ninth MOS tube, a tenth MOS tube, an eleventh MOS tube, a twelfth MOS tube and a transformer, wherein the D pole of the ninth MOS tube is connected with the D pole of the tenth MOS tube, the output end of the voltage output module, the S pole of the ninth MOS tube is connected with one end of the input end of the transformer and the D pole of the eleventh MOS tube, the S pole of the tenth MOS tube is connected with the other end of the input end of the transformer, the D pole of the twelfth MOS tube, the output end of the transformer is connected with the first input end of the bus load working module, the S pole of the eleventh MOS tube is grounded, the S pole of the twelfth MOS tube is grounded, the G pole of the ninth MOS tube is connected with the G pole of the twelfth MOS tube, the PWM signal, and the G pole of the tenth MOS tube is connected with the G pole of the eleventh MOS tube.
4. The photovoltaic grid-connected, mains and energy storage hybrid power supply system according to claim 1, wherein the bus load working module comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch and a load, one end of the first switch is connected with one end of the fifth switch and the output end of the DC-AC conversion module, one end of the second switch is connected with one end of the sixth switch and the output end of the DC-AC conversion module, the other end of the first switch is connected with the other end of the fifth switch, one end of the third switch and one end of the load, the other end of the load is connected with the other end of the second switch, the other end of the sixth switch and one end of the fourth switch, the other end of the third switch is connected with the output end of the mains module, and the other end of the fourth switch is connected with the output end of the mains module.
5. The photovoltaic grid-connected, city grid and energy storage hybrid power supply system according to claim 1, wherein the second voltage detection module comprises a fourth resistor, a fifth resistor, a fourth diode, a fifth triode, a relay, a fifth diode and a sixth MOS tube, one end of the fourth resistor is connected with the output end of the first voltage detection module, the other end of the fourth resistor is connected with one end of the fifth resistor and the cathode of the fourth diode, the other end of the fifth resistor is grounded, the anode of the fourth diode is connected with the base of the fifth triode, the collector of the fifth triode is connected with one end of the relay, the cathode of the fifth diode and 5V voltage, the emitter of the fifth triode is connected with the G pole of the sixth MOS tube, the D pole of the sixth MOS tube is grounded, the S pole of the sixth MOS tube is connected with the other end of the relay and the anode of the fifth diode.
CN202310870427.6A 2023-07-17 2023-07-17 Photovoltaic off-grid, commercial network and energy storage hybrid power supply system Active CN116599192B (en)

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CN114726061A (en) * 2022-06-01 2022-07-08 深圳市菲尼基科技有限公司 Control system for lithium battery power management
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CN116039384A (en) * 2023-04-03 2023-05-02 深圳市安和威电力科技股份有限公司 New energy high-power charging circuit
CN116094143A (en) * 2023-04-06 2023-05-09 北京电科智芯科技有限公司 Power voltage detecting system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015096223A1 (en) * 2013-12-27 2015-07-02 深圳市航嘉驰源电气股份有限公司 Power conversion circuit
WO2021258366A1 (en) * 2020-06-24 2021-12-30 东莞新能安科技有限公司 Control circuit, battery management system and electrochemical device
CN114726061A (en) * 2022-06-01 2022-07-08 深圳市菲尼基科技有限公司 Control system for lithium battery power management
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