CN113472009A - Multi-working-condition parallel light storage integrated machine system and configuration method thereof - Google Patents
Multi-working-condition parallel light storage integrated machine system and configuration method thereof 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
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- 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
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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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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a multi-working-condition parallel light storage integrated machine system and a configuration method thereof, wherein the light storage integrated machine system comprises a plurality of light storage integrated machines, each light storage integrated machine comprises a charger, an energy storage battery, a photovoltaic DC-DC converter, a DC-DC converter and an inverter, the light storage integrated machines further comprise an external power supply interface, a load interface, a parallel machine interface, a first switch and a second switch, the external power supply interface is respectively connected with the input end of the charger and one end of the first switch, the load interface is respectively connected with the other end of the first switch and the parallel machine interface, the parallel machine interface is connected with one end of the second switch, and the other end of the second switch is connected with the output end of the inverter; all the light storage all-in-one machines are connected in parallel through parallel machine interface connection, and the working mode of the light storage all-in-one machine system is controlled by controlling the on-off of the first switch and the second switch. The invention simplifies the hardware topological structure of the optical storage integrated machine system and can work in different working modes.
Description
Technical Field
The invention belongs to the technical field of electrical engineering, and particularly relates to a multi-working-condition parallel light storage integrated machine system and a configuration method thereof.
Background
The design of the light storage integrated machine takes small-sized household distributed photovoltaic power generation as a basic function, and an energy storage link is configured to improve the reliability and off-grid operation capability of the system. The storage battery can provide a smoothing function for the system in the grid connection process, and the grid connection electric energy quality is improved; when the power grid fails, the power supply is supplied to the local load, so that the basic power consumption when the power grid is powered off can be solved to a certain extent. The two are mutually matched, and the method has obvious promotion effects on the aspects of improving the reliability of the system, prolonging the power supply time, improving the electric energy quality, realizing the large-scale popularization of the photovoltaic grid connection and the like.
The existing low-power light storage all-in-one machine can only be used by a single family side in a distributed photovoltaic power generation system, and in order to meet different use requirements of different users on power, all-in-one machines which can be used in parallel are needed.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a multi-working-condition parallel light storage all-in-one machine system and a configuration method thereof, wherein the multi-working-condition parallel light storage all-in-one machine system can simplify the number of switches and the connection relation when the light storage all-in-one machines are connected in parallel and is simple to control.
In order to achieve the above object, a first aspect of the present invention provides a multi-operating-condition parallel light-storage integrated machine system, which includes a plurality of light-storage integrated machines, each light-storage integrated machine includes a charger, an energy storage battery, a photovoltaic DC-DC converter, a DC-DC converter, and an inverter, an output end of the charger and an output end of the photovoltaic DC-DC converter are respectively connected to an input end of the energy storage battery, an output end of the energy storage battery is connected to an input end of the DC-DC converter, and an output end of the DC-DC converter is connected to an input end of the inverter through a DC bus; each light storage all-in-one machine further comprises an external power supply interface, a load interface, a parallel machine interface, a first switch and a second switch, wherein the external power supply interface is respectively connected with the input end of the charger and one end of the first switch; the plurality of light storage all-in-one machines are connected in parallel through the parallel machine interface, and the working mode of the plurality of light storage all-in-one machines in parallel is controlled by controlling the on-off of the first switch and the second switch.
Furthermore, an external power supply interface of any one of the light storage all-in-one machines is connected with an external alternating current power supply, and when a load interface of any one of the light storage all-in-one machines is connected with a load, a first switch of each light storage all-in-one machine is controlled to be closed and a second switch of each light storage all-in-one machine is controlled to be turned off, so that the light storage all-in-one machine system works in a grid-connected charging mode.
Further, when the light-storage integrated machine system works in a grid-connected charging mode, an accessed external alternating current power supply directly supplies power to a load, and a charger charges an energy storage battery.
Further, when the energy storage battery is in a full-power state and the illumination condition is good, the first switch and the second switch of each light storage all-in-one machine are controlled to be closed, so that the light storage all-in-one machine system works in a grid-connected power generation mode.
Further, when the light storage integrated machine system works in a grid-connected power generation mode, the energy storage battery supplies power to the load through the DC-DC converter and the inverter, and meanwhile grid-connected power generation is carried out.
Furthermore, no external power supply interface in the multiple light storage all-in-one machines is connected with an external alternating current power supply, and when a load interface of any one light storage all-in-one machine is connected with a high-power load, the first switch of each light storage all-in-one machine is controlled to be turned off and the second switch of each light storage all-in-one machine is controlled to be turned on, so that the light storage all-in-one machine system works in an off-network inversion mode.
Further, when the light storage integrated machine system works in an off-grid inversion mode, the energy storage battery supplies power to the accessed high-power load through the DC-DC converter and the inverter.
Further, the light stores up all-in-one system still includes the controller, the controller is used for making the light store up all-in-one system from the charging mode that is incorporated into the power networks and switching into the contravariant mode of leaving the network when the electric wire netting stops supplying power and detects the island condition.
Further, the light stores up all-in-one system still includes the controller, the controller is used for controlling the direct current busbar voltage of every light stores up all-in-one invariable to the alternating voltage, the frequency and the phase place of every branch road of control access load are the same.
The second aspect of the invention provides a configuration method of a multi-working-condition parallel light storage integrated machine system, which comprises the following steps:
configuring the light-storing all-in-one machine system according to the first aspect;
controlling a first switch of each light storage all-in-one machine to be closed and a second switch to be closed, so that the light storage all-in-one machine system works in a grid-connected charging mode; or
Controlling a first switch and a second switch of each light storage all-in-one machine to be closed, so that the light storage all-in-one machine system works in a grid-connected power generation mode; or
And controlling the first switch of each light storage all-in-one machine to be switched off and the second switch to be switched on, so that the light storage all-in-one machine system works in an off-grid inversion mode.
The invention simplifies the hardware topological structure of the light-storage integrated machine system, solves the problem of complex interfaces when a plurality of light-storage integrated machines are connected in parallel, and can conveniently adjust the light-storage integrated machine system to work under different working conditions according to the requirements.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical storage integrated machine according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an optical storage integrated machine system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of the integrated optical storage system according to an embodiment of the present invention operating in an off-grid inversion mode;
fig. 4 is a schematic diagram of the light storage integrated machine system according to an embodiment of the present invention operating in a grid-connected charging mode;
fig. 5 is a schematic diagram of the light-storage all-in-one machine system according to an embodiment of the present invention operating in a grid-connected power generation mode.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
In the description of the embodiments of the present invention, it should be noted that the term "connected" is to be interpreted broadly, and may be, for example, electrically connected, directly connected, or indirectly connected through an intermediate, unless explicitly stated or limited otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying a number of the indicated technical features. Thus, a defined feature of "first", "second", may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the integrated optical storage system of the present invention includes a plurality of integrated optical storage devices 1, each integrated optical storage device 1 includes a charger 11, an energy storage battery 12, a photovoltaic DC-DC converter 13, a DC-DC converter 14, and an inverter 15, an output end of the charger 11 and an output end of the photovoltaic DC-DC converter 13 are respectively connected to an input end of the energy storage battery 12, an output end of the energy storage battery 12 is connected to an input end of the DC-DC converter 14, and an output end of the DC-DC converter 14 is connected to an input end of the inverter 15 through a DC bus; each light storage all-in-one machine further comprises an external power supply interface 16, a load interface 17, a parallel machine interface 18, a first switch K1 and a second switch K2, wherein the external power supply interface 16 is respectively connected with the input end of the charger 11 and one end of the first switch K1, the load interface 17 is respectively connected with the other end of the first switch K1 and the parallel machine interface 18, the parallel machine interface 18 is connected with one end of the second switch K2, and the other end of the second switch K2 is connected with the output end of the inverter 15. The first switch K1 and the second switch K2 can be controllable switches, such as relays, current-mode fully-controlled devices, voltage-mode fully-controlled devices, and the like. The input end of the photovoltaic DC-DC converter 13 is connected with an external photovoltaic component, and the energy storage battery can be charged through photovoltaic power generation. When an external power supply is connected to the external power supply interface 16, the energy storage battery can be charged by the charger. In addition, by controlling the first switch K1 to be closed and the second switch to be closed, the external power supply accessed by the external power supply interface 16 can directly supply power to the load accessed by the load interface 17. The first switch K1 is controlled to be turned off, the second switch is controlled to be turned on, the voltage can be boosted through the DC-DC converter 13 by the energy storage battery 12, and the inverter 15 is used for supplying power to the load in an inverted mode.
In order to ensure that a plurality of light storage integrated machines 1 can be externally connected with an external alternating current source and a load through any external interface when connected in parallel, the external power source, the load, the wires adopted at the parallel machine interface side, the external alternating current source input end, the alternating current load end, the alternating current parallel machine end and two control switches K1 and K2 can meet the design of multi-machine parallel power. For example, the power of a single machine of the product is 1kW, and when at most 6 machines are connected in parallel, the interfaces, the wiring and the heat dissipation of the black solid line part all need to meet the design requirement of 6 kW.
As shown in fig. 2, the optical storage integrated machine system of the present invention is formed by connecting a plurality of optical storage integrated machines 1 in parallel, and when a plurality of optical storage integrated machines 1 are connected in parallel, the parallel connection of the plurality of optical storage integrated machines can be conveniently realized by connecting the parallel connection interface 18 of each optical storage integrated machine 1, so that the problem of complicated interfaces when a plurality of optical storage integrated machines are connected in parallel is solved, the operation is very convenient, and even non-professional personnel can perform parallel connection operation. When the light storage integrated machine system is used in parallel, the light storage integrated machine system is divided into two working modes of off-grid inversion and grid connection according to the existence of external alternating current source access. In addition, the grid-connected working mode is divided into two working modes of grid-connected power generation and grid-connected charging according to the state of the energy storage battery and the illumination condition, and different working modes are switched by controlling the on-off of the first switch K1 and the second switch K2. The light-storage integrated machine system selects which working mode to work in, and is configured according to actual arrangement requirements and working conditions as required.
As shown in fig. 3, when no external power supply is connected to the external power interface, the optical storage integrated machine system of the present invention may select an off-grid inversion operating mode, and control the first switch K1 of each optical storage integrated machine 1 to be turned off, and the second switch K2 to be turned on, so that each optical storage integrated machine is boosted by the energy storage battery through the DC-DC converter and inverted by the inverter, and then converged by the parallel machine connection line to supply power to one of the access loads. Under the working mode, the power consumption requirement of a high-power load under the condition of no power grid power supply can be met. The light stores the control of all-in-one system for selecting the contravariant mode of leaving the net simple, and the first switch K1 and the break-make of second switch K2 of every light stores the all-in-one is the same, the operation control of being convenient for.
In addition, in the off-grid inversion working mode, because the external load supplies power by the energy storage batteries of each optical storage all-in-one machine in parallel, the alternating voltage, the frequency and the phase of each branch circuit connected to the load are also required to be considered to be the same. Therefore, the controller can control the direct current bus of each light storage all-in-one machine to be constant so as to ensure that the alternating current voltage, the frequency and the phase of the branch circuit of each light storage all-in-one machine, which is converged into the external load, are consistent. Specifically, a master-slave mode can be adopted, a master machine is in voltage closed-loop control, a slave machine is in current closed-loop control, and the consistency of the amplitude values of the output phases is ensured according to a prediction dead beat control method of the current closed-loop control.
The core idea of the voltage control strategy is to control the balance between the input power and the output power of the direct current bus in a power grid period, so that the charge on the capacitors connected in parallel at two ends of the direct current bus is not increased or decreased at the beginning and the end of the period, namely, the stability of the direct current bus voltage is controlled.
Within a grid cycle, the output and input changes are respectively:
ΔJo＝(UgridIn+1-UgridIn)T＝UgridΔIT (7)
in the formula, Δ J is an energy change of input/output in one cycle, Δ U is a change amount of a dc bus voltage, and Δ I is a change amount of an effective value of an ac current. Let the above two equations be equal, have:
equation (9) is the control method of the outer loop, and can be regarded as a P link. Δ I is obtained and added to the current ac current, i.e., Iref (n) ═ Iref (n-1) + I (n), and the control is PI control for the target value.
And after the target value of the grid-connected current effective value is obtained, the duty ratio of the control current instantaneous value at the current moment is obtained by the inner loop through grid-connected current prediction dead-beat control. The strategy can not only lock the phase of the power grid, so that the grid-connected current output by the inverter is in the same phase with the voltage, but also reduce the ripple of the current through the deadbeat control.
As shown in fig. 4, when an external power supply is connected through an external power supply interface of any optical storage all-in-one machine, a grid-connected charging mode can be selected at this time, the first switch K1 of each optical storage all-in-one machine is controlled to be closed, the second switch K2 is controlled to be turned off, the external power supply directly supplies power to a load through the first switch K1 branch, meanwhile, the external power supply can also charge an energy storage battery through a charger, and the photovoltaic module can also charge the energy storage battery through photovoltaic power generation. Under the working mode, the external power supply supplies power to the load when the external power supply is connected, the energy storage battery can be charged at the moment, the power supply mode is reasonably distributed, and the long-time use of the energy storage battery is facilitated. The light stores the control of all-in-one system adoption grid-connected charging mode simple, and the first switch K1 and the break-make of second switch K2 of every light stores the all-in-one is the same, the operation control of being convenient for.
As shown in fig. 5, when the energy storage battery is in a high electric quantity or full electric state and the illumination condition is good, the grid-connected power generation mode can be selected at this time, the first switch K1 and the second switch K2 of each light storage all-in-one machine are controlled to be closed, the charger does not work, the output end of the inverter of each light storage all-in-one machine is connected with the power grid through the parallel machine interface connection line, the energy storage battery supplies power to the load after being inverted by the inverter, and meanwhile, the grid-connected power generation is performed. In the working mode, surplus energy storage of the energy storage battery can be effectively utilized to generate electricity for a power grid, and a power supply mode is reasonably distributed. The light storage all-in-one machine system is simple to control in a grid-connected power generation working mode, and the first switch K1 and the second switch K2 of each light storage all-in-one machine are same in on-off state, so that the light storage all-in-one machine system is convenient to operate and control.
In addition, in the grid-connected mode, because the grid-connected switch K1 is closed and connected with the output of the inverter circuit, the controller still works in the grid-connected mode at this time, and if the grid fails, the parameters of the grid voltage may or may not change. When the power supply of the power grid is stopped due to a fault or other reasons, the photovoltaic grid-connected power generation system at the user end cannot be detected in time, and the photovoltaic grid-connected power generation system is not cut off from the power grid, so that a self-sufficient power supply island consisting of the photovoltaic grid-connected power generation system and a local load is formed, and the condition is called an island effect. After the islanding is formed, if the islanding is not judged and prevented in time, certain danger can be caused to the system and the load: after the balance function of the power grid is lost, once the voltage and the frequency output by the controller are abnormal, the load equipment can be damaged; a large number of photovoltaic array islands may cause electrification of a power distribution side, so that danger is caused to maintenance personnel; meanwhile, the single-phase grid-connected inverter operates in an isolated island mode, so that three phases of a power grid are unbalanced, and therefore three-phase loads are damaged; after the power supply of the power grid is recovered, the long-term island operation may bring a large phase difference between the load voltage and the power grid voltage, so that a large impact current is caused, and the power generation equipment is damaged. Therefore, the controller is used for detecting the island condition when the power grid stops supplying power, so that the grid-connected charging mode of the light storage integrated machine system is switched to the off-grid inversion working mode.
The island detection method comprises a passive type and an active type. The passive detection method mainly judges the islanding effect by detecting the voltage, the frequency and the like of the current power grid. Common passive detection methods include over-voltage detection, under-voltage detection, over-frequency detection, and under-frequency detection. By detecting the output voltage and frequency of the grid-connected inverter, once the output voltage and frequency exceed a set range, the island state can be considered to be entered. The advantage of passive detection is that it is relatively simple to implement and does not require additional perturbations in the system. However, only passive detection methods cannot be used, because when the inverter output power is just balanced with the load power, there is a possibility that the grid voltage and frequency do not exceed the variation range, and at this time, the grid fault cannot be detected.
The active detection method is to continuously inject interference signals into the power grid by the inverter and observe whether the interference can be accumulated in the system. The present invention uses a dual positive feedback active frequency offset method. The difference between the grid frequency and the average frequency is used as a first positive feedback to adjust the frequency of grid-connected current; and the change of the frequency deviation is used as a second positive feedback, and the amplification factor of the first positive feedback is adjusted. In actual operation, the inverse period T of the frequency is 1/f as the regulating variable.
The period size T (i) of the grid-connected current reference waveform is determined by the formula (1):
wherein T (i) represents the period of the grid voltage of the i-th period detected by the zero crossing pointThe length of the first and second support members,
represents the average of the lengths of the i-th cycle followed by several cycles.
The index dT is used to measure the trend of frequency disturbance:
dT >0 means that the trend of the frequency deviation from the average frequency increases, when the frequency deviation trend is accelerated by increasing the feedback weight:
K(i)＝K(i-1)+K0 (4)
if dT is less than or equal to 0, let:
K(i)＝K0 (5)
introduction of
The periodic offset of (d) is:
under the normal grid-connected condition, K (i) is limited to a few small values near K0, the influence of frequency deviation on the quality of electric energy is small, when an island condition occurs, the two factors can introduce a positive feedback effect and increase continuously, so that T (i) is increased rapidly to a threshold value triggering lower limit protection of frequency, and a PV system can detect the island and switch the working mode.
The values of m and n also have great influence on the frequency deviation effect and can be set according to the stable condition of the power grid frequency. If the grid frequency is stable, n can take a larger value, otherwise m can take a larger value. In the present invention, m is 1 and n is 2, but the present invention is not limited thereto.
The invention also aims to provide a configuration method of a multi-working-condition parallel light storage integrated machine system, which comprises the following steps:
the light and storage all-in-one machine system of the embodiment is configured. The optical storage integrated machine system has been described in detail above, and is not described herein again.
Controlling a first switch of each light storage all-in-one machine to be closed and a second switch to be closed, so that the light storage all-in-one machine system works in a grid-connected charging mode; or
Controlling a first switch and a second switch of each light storage all-in-one machine to be closed, so that the light storage all-in-one machine system works in a grid-connected power generation mode; or
And controlling the first switch of each light storage all-in-one machine to be switched off and the second switch to be switched on, so that the light storage all-in-one machine system works in an off-grid inversion mode.
In conclusion, the invention simplifies the hardware topological structure of the light-storage integrated machine system, solves the problem of complex interfaces when a plurality of light-storage integrated machines are connected in parallel, and can conveniently adjust the light-storage integrated machine system to work under different working conditions according to the needs.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. The multi-working-condition parallel light storage integrated machine system is characterized by comprising a plurality of light storage integrated machines, wherein each light storage integrated machine comprises a charger, an energy storage battery, a photovoltaic DC-DC converter, a DC-DC converter and an inverter, the output end of the charger and the output end of the photovoltaic DC-DC converter are respectively connected with the input end of the energy storage battery, the output end of the energy storage battery is connected with the input end of the DC-DC converter, and the output end of the DC-DC converter is connected with the input end of the inverter through a direct current bus; each light storage all-in-one machine further comprises an external power supply interface, a load interface, a parallel machine interface, a first switch and a second switch, wherein the external power supply interface is respectively connected with the input end of the charger and one end of the first switch; the light storage all-in-one machines are connected in parallel through the parallel machine interface, and the working mode of the light storage all-in-one machine system is controlled by controlling the on-off of the first switch and the second switch.
2. The integrated optical storage and energy storage machine system as claimed in claim 1, wherein an external ac power supply is connected to an external power supply interface of any one of the plurality of integrated optical storage machines, and when a load is connected to a load interface of any one of the integrated optical storage machines, the first switch of each integrated optical storage machine is controlled to be turned on and the second switch of each integrated optical storage machine is controlled to be turned off, so that the integrated optical storage machine system operates in a grid-connected charging mode.
3. The integrated optical storage and power supply system of claim 2, wherein when the integrated optical storage and power supply system works in a grid-connected charging mode, an accessed external alternating current power supply directly supplies power to a load, and a charger charges an energy storage battery.
4. The integrated optical storage and power generation system as claimed in claim 1, wherein when the energy storage battery is in a full power state and the illumination condition is good, the first switch and the second switch of each integrated optical storage and power generation system are controlled to be closed, so that the integrated optical storage and power generation system works in a grid-connected power generation mode.
5. The integrated optical storage and power generation system as claimed in claim 4, wherein when the integrated optical storage and power generation system works in a grid-connected power generation mode, the energy storage battery supplies power to a load through the DC-DC converter and the inverter, and meanwhile grid-connected power generation is carried out.
6. The integrated optical storage and energy storage machine system as claimed in claim 1, wherein no external power interface of the plurality of integrated optical storage machines is connected to an external alternating current power supply, and when a high-power load is connected to a load interface of any one of the integrated optical storage machines, the first switch of each integrated optical storage machine is controlled to be turned off and the second switch of each integrated optical storage machine is controlled to be turned on, so that the integrated optical storage machine system works in an off-grid inversion mode.
7. The integrated optical storage and energy storage machine system as claimed in claim 4, wherein when the integrated optical storage machine system works in an off-grid inversion mode, the energy storage battery supplies power to an accessed high-power load through the DC-DC converter and the inverter.
8. The light-storage integrated machine system according to claim 2, further comprising a controller, wherein the controller is configured to switch the light-storage integrated machine system from a grid-connected charging mode to an off-grid inversion mode when the grid stops supplying power and an islanding condition is detected.
9. The integrated optical storage and energy storage machine system according to claim 6, further comprising a controller, wherein the controller is configured to control the dc bus voltage of each integrated optical storage machine to be constant, so as to control the ac voltage, frequency and phase of each branch connected to the load to be the same.
10. A configuration method for a multi-working-condition parallel light storage integrated machine system is characterized by comprising the following steps:
configuring the light-storing all-in-one machine system according to claim 1;
controlling a first switch of each light storage all-in-one machine to be closed and a second switch to be closed, so that the light storage all-in-one machine system works in a grid-connected charging mode; or
Controlling a first switch and a second switch of each light storage all-in-one machine to be closed, so that the light storage all-in-one machine system works in a grid-connected power generation mode; or
And controlling the first switch of each light storage all-in-one machine to be switched off and the second switch to be switched on, so that the light storage all-in-one machine system works in an off-grid inversion mode.
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