CN113964861A - Grid-connected and off-grid dual-mode single-phase photovoltaic energy storage system - Google Patents
Grid-connected and off-grid dual-mode single-phase photovoltaic energy storage system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The invention discloses a grid-connected and off-grid dual-mode single-phase photovoltaic energy storage system which comprises a main loop, a power supply system, an analog circuit and a digital circuit, wherein the main loop comprises a bidirectional DC/DC circuit, a HERIC inverter bridge and an LC filter, and the bidirectional DC/DC circuit comprises a two-way parallel DAB circuit and a staggered buck/boost circuit; the HERIC inverter circuit comprises an inverter bridge and a bidirectional switch connected in series at two ends of an H bridge arm and is used for isolating the power grid from the energy storage battery in a follow current stage; the power supply system comprises two groups of single-tube flyback power supplies and is used for supplying power to the system. The grid-connected and off-grid dual-mode photovoltaic energy storage system is suitable for photovoltaic systems in more working modes, can realize high-efficiency free switching between grid connection and off-grid, can charge and discharge energy storage batteries in the grid connection mode, and can be used as a standby power supply in the off-grid mode to supply power for important loads.
Description
Technical Field
The invention relates to the technical field related to photovoltaic energy storage, in particular to a grid-connected and off-grid dual-mode single-phase photovoltaic energy storage system.
Background
Grid-connected solar photovoltaic power generation refers to a mode that solar photovoltaic power generation is connected to a national power grid to generate power, and the grid-connected solar photovoltaic power generation is supplemented by the power grid and is characterized in that a storage battery is not needed. However, because the existing new energy power generation systems such as photovoltaic and wind power systems have low reliability and smart power grids are not established, in order to ensure that the power generated by the photovoltaic power generation systems is directly supplied to local loads for power utilization and is not fed to the power grids, a grid-connected and grid-disconnected type photovoltaic energy storage inversion control system needs to be added into the new energy power generation systems to realize grid-connected and grid-disconnected operation and grid-connected and grid-disconnected switching.
The existing grid-connected and off-grid photovoltaic energy storage system has a single working mode, is difficult to realize intellectualization, cannot meet diversified requirements of users, and cannot realize functions of peak clipping, valley filling, power grid supporting and the like.
Disclosure of Invention
The invention aims to provide a grid-connected and off-grid dual-mode single-phase photovoltaic energy storage system to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a grid-connected and off-grid dual-mode single-phase photovoltaic energy storage system comprises a main circuit, a power supply system and analog and digital circuits, wherein the main circuit comprises a bidirectional DC/DC circuit, a HERIC inverter bridge and an LC filter, the bidirectional DC/DC circuit, the HERIC inverter bridge and the LC filter are sequentially connected, the bidirectional DC/DC circuit comprises a double-circuit parallel DAB circuit and a staggered buck/boost circuit, the double-circuit parallel DAB circuit is used for boosting the voltage of a low-voltage direct-current side to a medium-voltage direct-current side, and the staggered buck/boost circuit is used for finely tuning and boosting the voltage of the medium-voltage direct-current side and stabilizing the voltage of a high-voltage direct-current bus; the HERIC inverter circuit comprises an inverter bridge and a bidirectional switch connected in series at two ends of an H bridge arm and is used for isolating the power grid from the energy storage battery in a follow current stage; the power supply system comprises two groups of single-tube flyback power supplies and is used for supplying power to the system.
As a further scheme of the invention: the DAB circuit is composed of a high-frequency transformer with a transformation ratio of 1:6, an IGBT on the low-voltage side of the high-frequency transformer and an IGBT on the high-voltage side of the high-frequency transformer, and the IGBT on the low-voltage side is connected with an energy storage battery.
As a further scheme of the invention: two groups of single-tube flyback power supplies are connected through an alternating current pre-charging circuit, one group of single-tube flyback power supplies are connected with an energy storage battery, and the other group of single-tube flyback power supplies comprise an isolation power supply module.
As a further scheme of the invention: the LC filter is connected with a power grid and a load and used for being merged into the power grid and supplying power to the load.
As a further scheme of the invention: the analog and digital circuit comprises an MCU, and the MCU comprises a DSP interface circuit, an MCU power supply circuit, a voltage sampling circuit and a current sampling circuit; the voltage sampling circuit comprises a resistance voltage division circuit and a second-order Bessel filter circuit; the current sampling circuit comprises a current Hall sensor and a second-order Bessel filter circuit and is used for sampling Buck/boost inductive current and network side and machine side currents.
As a further scheme of the invention: the MCU is a DSP chip of a model TMS320F 28069.
Compared with the prior art, the invention has the beneficial effects that: the grid-connected and off-grid dual-mode photovoltaic energy storage system is suitable for photovoltaic systems in more working modes, can realize high-efficiency free switching between grid connection and off-grid, can charge and discharge energy storage batteries in the grid connection mode, and can be used as a standby power supply in the off-grid mode to supply power for important loads.
Drawings
Fig. 1 is a system architecture diagram according to a first embodiment of the present invention.
FIG. 2 is a schematic diagram of a bidirectional DC/DC circuit topology of the present invention.
Fig. 3 is a topological schematic diagram of the inverter circuit of the HERIC of the present invention.
Fig. 4 is a diagram showing a power supply system according to the present invention.
Fig. 5 is a schematic circuit diagram of an isolated power supply module according to the present invention.
FIG. 6 is a circuit diagram of the DSP interface according to the present invention.
FIG. 7 is a circuit diagram of the MCU power supply of the present invention.
Fig. 8 is a system architecture diagram according to a second embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the first embodiment, referring to fig. 1, in the embodiment of the present invention, in the grid-connected mode, a grid-connected and off-grid dual-mode single-phase photovoltaic energy storage system includes a main circuit, a power system, and analog and digital circuits, the main loop comprises a bidirectional DC/DC circuit, a HERIC inverter bridge and an LC filter, the bidirectional DC/DC circuit, the HERIC inverter bridge and the LC filter are sequentially connected, the LC filter is connected with a power grid and a load, for incorporation into a power grid and for powering a load, the bi-directional DC/DC circuit comprising a two-way parallel DAB circuit and an interleaved buck/boost circuit, as shown in figure 2, the DAB circuit consists of a high-frequency transformer with a transformation ratio of 1:6, an IGBT on the low-voltage side of the high-frequency transformer and an IGBT on the high-voltage side, the IGBT on the low-voltage side is connected with an energy storage battery, the DAB circuit of the first stage raises the voltage of 48V on the low-voltage direct current side to 300V on the medium-voltage direct current side, and the parallel connection structure is adopted to reduce the current stress of a switching tube. A resonant cavity is formed by the transformation leakage inductance and the high-voltage side capacitor, and the switching frequency is set to be slightly lower than the resonance frequency, so that the circuit works in an under-resonance state. In this state, when the energy storage battery discharges, the primary side field effect tube can realize zero current turn-off, and the secondary side anti-parallel rectifier diode can realize natural turn-off without reverse recovery loss; when the energy storage battery is charged, the IGBT on the secondary side can realize zero current turn-off, the rectifier diode in inverse parallel connection on the primary side can realize natural turn-off, reverse recovery loss does not exist, the field effect tube can work in a synchronous rectification state, the conduction loss of the switch tube on the primary side is reduced, and therefore efficiency is further improved. The resonance current is detected by a current transformer and is used for realizing overcurrent protection; the second-stage staggered Buck/boost circuit raises 300V of a medium-voltage direct-current side to 400V rated voltage of the high-voltage direct-current bus to stabilize voltage of the high-voltage direct-current bus, and Buck/boost inductive current is detected through the current Hall sensor to realize voltage and current double closed-loop control and improve dynamic performance of the system.
As shown in fig. 3, the inverter circuit of the HERIC includes an inverter bridge and two bidirectional switches connected in series on the ac side, when the grid current is positive for a half cycle, S2 is always on, and S3 and S26 are modulated according to the switching frequency, so that the freewheeling loop is always disconnected from the dc side, the common-mode voltage is always constant, and the common-mode current is effectively suppressed. In addition, the existence of the follow current switch also enables the output voltage waveform to be consistent with that of unipolar modulation, reduces the harmonic distortion rate of the output voltage and current, facilitates filtering, and reduces the loss on the filter inductor.
As shown in fig. 4 and 5, the power supply system includes two groups of single-tube flyback power supplies, the two groups of single-tube flyback power supplies are connected through an ac pre-charging circuit, one group of single-tube flyback power supplies is connected with an energy storage battery and is used for taking electricity from the side of the energy storage battery and providing a driving power supply for a low-voltage side MOSFET, when the system is started, initial electricity consumption is provided for the other group of flyback power supplies, the other group of single-tube flyback power supplies includes an isolation power supply module, the group of flyback power supplies takes electricity from a high-voltage direct-current bus, supplies power to a control board and a relay, and provides an isolation driving power supply for an IGBT; the rest IGBT driving power supply is obtained by the output of the flyback power supply through the isolation power supply module.
As shown in fig. 6 and 7, the analog and digital circuit uses a DSP chip TMS320F28069 as an MCU, and includes a DSP interface circuit, an MCU power supply circuit, a voltage sampling circuit, and a current sampling circuit, where the MCU power supply circuit converts +12V provided by the flyback power supply 2 into +5V and +3.3V by using a conversion circuit built up by a DC/DC chip AP1510S, where +5V supplies power to the current hall sensor and the reference voltage circuit, +3.3V/DGND supplies power to the DSP chip, and +3.3V/AGND supplies reference voltage to the DSP sampling circuit; the voltage sampling circuit comprises a resistance voltage division circuit and a second-order Bessel filter circuit, wherein after voltage signals are sampled to be subjected to resistance voltage division, the second-order Bessel filter circuit is used for filtering, isolating and limiting, the rated voltage of a high-voltage direct-current bus is 400V, the sampling range is set to be 0-500V, the voltage signals are converted into 0-5V through the voltage division resistance, the gain of the second-order Bessel filter is set to be 0.5, the cut-off frequency is 3.05KHZ, the output signal ADC _ Udch is in the range of 0-2.5V, and the output signal ADC _ Udch can be connected to a DSP pin for sampling after being clamped and limited by a diode; the current sampling circuit comprises a current Hall sensor and a second-order Bessel filter circuit and is used for sampling Buck/boost inductive current, network side current and machine side current, the second-order Bessel filter circuit performs filtering and amplitude limiting, the measurement range of the machine side current Hall CASR 25-NP is-85A, the output range is 0.4V-4.6V, the gain of the second-order Bessel filter is set to be 0.5, the cut-off frequency is 3.05KHZ, the range of an output signal ADC _ Iac is 0.2-2.3V, and the current sampling circuit can be connected to a DSP pin for sampling after being limited by a diode.
In the grid-connected mode of the embodiment, the DAB circuit adopts fixed frequency control, the diagonal power tubes are simultaneously turned on and off, and the duty ratio is 50%; the staggered buck/boost circuit adopts PI control of a voltage-current double closed loop to maintain the stability of the voltage of the high-voltage direct-current bus; the HERIC inverter circuit adopts PI control and is used for adjusting the positive and negative sum of the inductive current, thereby controlling the flowing direction and the flowing magnitude of power.
In the second embodiment, as shown in fig. 8, in the off-grid mode, the difference from the first embodiment is that in the off-grid mode, the DAB circuit is controlled by a fixed frequency, the diagonal power transistors are turned on and off at the same time, and the duty ratio is 50%; the staggered buck/boost circuit adopts PI control of a voltage-current double closed loop to maintain the stability of the voltage of the high-voltage direct-current bus; the HERIC inverter circuit is controlled by PR and is used for adjusting the amplitude of the alternating current output voltage.
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 attributes 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 description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. A grid-connected and off-grid dual-mode single-phase photovoltaic energy storage system comprises a main loop, a power supply system and analog and digital circuits, and is characterized in that: the main loop comprises a bidirectional DC/DC circuit, a HERIC inverter bridge and an LC filter, the bidirectional DC/DC circuit, the HERIC inverter bridge and the LC filter are sequentially connected, the bidirectional DC/DC circuit comprises a double-circuit parallel DAB circuit and an interleaved buck/boost circuit, the double-circuit parallel DAB circuit is used for boosting the voltage of a low-voltage direct-current side to a medium-voltage direct-current side, and the interleaved buck/boost circuit is used for finely adjusting and boosting the voltage of the medium-voltage direct-current side and stabilizing the voltage of a high-voltage direct-current bus; the HERIC inverter circuit comprises an inverter bridge and a bidirectional switch connected in series at two ends of an H bridge arm and is used for isolating the power grid from the energy storage battery in a follow current stage; the power supply system comprises two groups of single-tube flyback power supplies and is used for supplying power to the system.
2. The grid-connected and off-grid dual-mode single-phase photovoltaic energy storage system according to claim 1, wherein: the DAB circuit is composed of a high-frequency transformer with a transformation ratio of 1:6, an IGBT on the low-voltage side of the high-frequency transformer and an IGBT on the high-voltage side of the high-frequency transformer, and the IGBT on the low-voltage side is connected with an energy storage battery.
3. The grid-connected and off-grid dual-mode single-phase photovoltaic energy storage system according to claim 1, wherein: two groups of single-tube flyback power supplies are connected through an alternating current pre-charging circuit, one group of single-tube flyback power supplies are connected with an energy storage battery, and the other group of single-tube flyback power supplies comprise an isolation power supply module.
4. The grid-connected and off-grid dual-mode single-phase photovoltaic energy storage system according to claim 1, wherein: the LC filter is connected with a power grid and a load and used for being merged into the power grid and supplying power to the load.
5. The grid-connected and off-grid dual-mode single-phase photovoltaic energy storage system according to claim 1, wherein: the analog and digital circuit comprises an MCU, and the MCU comprises a DSP interface circuit, an MCU power supply circuit, a voltage sampling circuit and a current sampling circuit; the voltage sampling circuit comprises a resistance voltage division circuit and a second-order Bessel filter circuit; the current sampling circuit comprises a current Hall sensor and a second-order Bessel filter circuit and is used for sampling Buck/boost inductive current and network side and machine side currents.
6. The grid-connected and off-grid dual-mode single-phase photovoltaic energy storage system according to claim 5, wherein: the MCU is a DSP chip of a model TMS320F 28069.
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| CN202111102628.9A CN113964861A (en) | 2021-09-21 | 2021-09-21 | Grid-connected and off-grid dual-mode single-phase photovoltaic energy storage system |
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| CN202111102628.9A CN113964861A (en) | 2021-09-21 | 2021-09-21 | Grid-connected and off-grid dual-mode single-phase photovoltaic energy storage system |
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| US10211734B1 (en) * | 2018-07-17 | 2019-02-19 | Huang-Jen Chiu | Bidirectional DC-DC converter |
| CN212627694U (en) * | 2020-04-02 | 2021-02-26 | 天津工业大学 | LLC resonant three-port DC-DC converter structure |
| CN112865171A (en) * | 2020-12-31 | 2021-05-28 | 江苏固德威电源科技股份有限公司 | Photovoltaic grid-connected inverter |
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