CN113131520B

CN113131520B - Optical storage system, control method thereof and storage medium

Info

Publication number: CN113131520B
Application number: CN202110483793.7A
Authority: CN
Inventors: 林镇煌; 胡斌; 洪培在
Original assignee: Xiamen Kehua Digital Energy Tech Co Ltd
Current assignee: Xiamen Kehua Digital Energy Tech Co Ltd
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2023-07-14
Anticipated expiration: 2041-04-30
Also published as: CN113131520A

Abstract

The invention is applicable to the technical field of new energy, and provides a light storage system, a control method thereof and a storage medium, wherein the light storage system comprises a photovoltaic cell panel, a converging unit, energy storage equipment, a DC/DC controller and a photovoltaic inverter; the photovoltaic cell panel is electrically connected with one end of the converging unit, the other end of the converging unit is electrically connected with a direct current bus of the photovoltaic inverter through the first circuit breaker, and an alternating current bus of the photovoltaic inverter is used for being electrically connected with the power transmission network system; the energy storage device is electrically connected with a first direct current end of the DC/DC controller, and a second direct current end of the DC/DC controller is electrically connected with the direct current bus; the photovoltaic inverter is respectively connected with the management system and the DC/DC controller through network links, and the DC/DC controller is respectively connected with the management system and the energy storage equipment through network links. The invention can reduce the running cost of the optical storage system.

Description

Optical storage system, control method thereof and storage medium

Technical Field

The invention belongs to the technical field of new energy, and particularly relates to an optical storage system, a control method thereof and a storage medium.

Background

With the increasing prominence of environmental problems, new energy featuring environmental protection and renewable energy is getting more and more attention from various countries, such as solar energy. The light storage system is a system combining a photovoltaic power station and energy storage equipment, can improve the utilization rate of solar energy, and can play a role in peak clipping and valley filling of a power grid.

At present, the optical storage system has the problem of higher operation cost.

Disclosure of Invention

In view of the above, the embodiments of the present invention provide an optical storage system, a control method thereof, and a storage medium, so as to solve the problem in the prior art that the optical storage system has a high running cost.

The first aspect of the embodiment of the invention provides a light storage system, which comprises a photovoltaic cell panel, a converging unit, energy storage equipment, a DC/DC controller and a photovoltaic inverter;

the photovoltaic cell panel is electrically connected with one end of the converging unit, the other end of the converging unit is electrically connected with a direct current bus of the photovoltaic inverter through the first circuit breaker, and an alternating current bus of the photovoltaic inverter is used for being electrically connected with the power transmission network system; the energy storage device is electrically connected with a first direct current end of the DC/DC controller, and a second direct current end of the DC/DC controller is electrically connected with the direct current bus;

the photovoltaic inverter is respectively connected with the management system and the DC/DC controller through network links, and the DC/DC controller is respectively connected with the management system and the energy storage equipment through network links.

Optionally, the network link includes at least one of an ethernet link, an RS485 bus, or a CAN bus.

Optionally, the optical storage system further comprises a rectifier bridge unit, one end of the rectifier bridge unit is electrically connected with the direct current bus through a second circuit breaker, and the other end of the rectifier bridge unit is electrically connected with the power transmission network system.

A second aspect of an embodiment of the present invention provides a control method applied to the optical storage system according to the first aspect, the control method including:

when the photovoltaic inverter receives control information of the management system, the photovoltaic inverter generates inversion information corresponding to the control information and sends the inversion information to the DC/DC controller;

the DC/DC controller performs charge and discharge processing corresponding to the inversion information.

Optionally, the DC/DC controller performs charge and discharge processing corresponding to the inversion information, including:

when the inversion information carries a rectification state identifier, the DC/DC controller executes charging processing;

and when the inversion information carries the inversion state identification, the DC/DC controller executes discharge processing.

Optionally, the control method further includes:

when the DC/DC controller executes discharge treatment, the photovoltaic inverter acquires the power generated by the photovoltaic panel and the discharge power of the energy storage device;

and if the sum of the generated power and the discharge power is smaller than the power limit value of the photovoltaic inverter, the photovoltaic inverter performs voltage stabilizing inversion processing corresponding to the preset power, otherwise, the photovoltaic inverter performs constant power inversion processing.

Optionally, the control method further includes:

when the DC/DC controller executes charging treatment, the photovoltaic inverter acquires charging power of the energy storage equipment;

the photovoltaic inverter performs voltage stabilization rectification processing corresponding to the rectification power according to the rectification power corresponding to the charging power.

Optionally, the control method further includes:

when the generated power of the photovoltaic cell panel is detected to be smaller than the reverse irrigation power, the first circuit breaker is disconnected;

and when the voltage of the photovoltaic cell panel is detected to be larger than the preset starting voltage, closing the first circuit breaker.

Optionally, the control method further includes:

and when the photovoltaic inverter is detected to be in a starting ready state, the first circuit breaker is in an open state and the voltage of the direct current bus is smaller than a preset voltage threshold value, closing the second circuit breaker.

A third aspect of the embodiments of the present invention provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the method according to the second aspect.

Compared with the prior art, the embodiment of the invention has the beneficial effects that:

according to the embodiment of the invention, the energy storage interface can be added at the DC bus of the inverter, so that the energy storage equipment can be fused with the photovoltaic power station, and the energy storage equipment is scheduled by the photovoltaic inverter, so that the combined control effect of the photovoltaic inverter and the energy storage equipment is improved, the energy loss is reduced, and the running cost of the photovoltaic storage system can be reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an optical storage system according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a dc parallel communication architecture according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a dc independent communication architecture according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of another optical storage system according to an embodiment of the present invention;

FIG. 5 is a flowchart illustrating steps of a method for controlling an optical storage system according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of energy flow in mode 1 according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of energy flow in mode 2 according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of energy flow in mode 3 according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of energy flow in mode 4 and mode 5 according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of energy flow in mode 6 and mode 7 according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of energy flow in mode 8 according to an embodiment of the present invention;

FIG. 12 is a schematic diagram of the energy flow of mode 9 according to an embodiment of the present invention;

FIG. 13 is a schematic diagram of a mode switch according to an embodiment of the present invention;

fig. 14 is a schematic diagram of a terminal device according to an embodiment of the present invention.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

In order to illustrate the technical scheme of the invention, the following description is made by specific examples.

As described in the related art, the current optical storage system has a problem of high operation cost. In particular, existing photovoltaic storage systems typically employ a separate architecture of photovoltaic power stations and energy storage devices, such as the configuration of the energy storage devices on the high voltage side, e.g., the 33KV bus side. Thus, it is necessary to control the photovoltaic inverter and the energy storage device of the photovoltaic power station separately, and to perform peak clipping, valley filling and frequency response functions by scheduling the energy storage device. However, the photovoltaic inverter and the energy storage device are controlled respectively, so that the problem that the combined control effect of the photovoltaic inverter and the energy storage device is poor exists, the energy loss is more, and the operation cost of the photovoltaic storage system is higher.

In order to solve the problems in the prior art, the embodiment of the invention provides an optical storage system, a control method thereof and a storage medium. The following first describes an optical storage system provided by an embodiment of the present invention.

The embodiment of the invention provides an optical storage system architecture with an energy storage interface added at a DC bus of an inverter, which can be used for dispatching energy storage equipment by a photovoltaic inverter so as to realize peak clipping and valley filling as well as frequency response functions.

As shown in fig. 1, fig. 1 shows a schematic architecture diagram of a photovoltaic storage system according to an embodiment of the present invention, where the photovoltaic storage system includes a photovoltaic panel PV, a junction unit, an energy storage device Battery, a DC/DC controller, and a photovoltaic inverter DC/AC.

Specifically, the connection relation of all the components in the optical storage system can be as shown in a solid line connection mode in fig. 1, a photovoltaic cell panel PV is electrically connected with one end of a converging unit, the other end of the converging unit is electrically connected with a direct current bus DC of a photovoltaic inverter DC/AC through a first circuit breaker, and the alternating current bus AC of the photovoltaic inverter DC/AC is electrically connected with a Grid system outside the optical storage system; the energy storage device Battery is electrically connected with a first direct current end DC of the DC/DC controller, and a second direct current end DC of the DC/DC controller is electrically connected with a direct current bus DC of the photovoltaic inverter DC/AC.

The other end of the converging unit is electrically connected with a direct current bus DC of the photovoltaic inverter DC/AC through the first circuit breaker, so that the photovoltaic panel can be prevented from being reversely irrigated by energy under the condition that the photovoltaic panel is not electrified at night or the photovoltaic inverter is in a rectifying mode, and the safety of the light storage system is improved.

In addition, the communication relation of each component in the optical storage system can be in a dotted arrow connection mode as shown in fig. 1, and the photovoltaic inverter DC/AC is respectively connected with a management system and a DC/DC controller outside the optical storage system through a network link, wherein the management system can be an energy management system EMS; the DC/DC controller is respectively connected with the management system and the energy storage device Battery through network links. It should be noted that, the management system may be connected to the dispatch center through a network link.

In some embodiments, the network link may be an ethernet link, an RS485 bus, or a CAN bus.

For example, the dispatch center may communicate with the energy management system EMS via an Ethernet link, e.g., the dispatch center may send dispatch instructions carrying control information to the energy management system EMS. The energy management system EMS may parse the command from the dispatch center and send the parsed control information to the photovoltaic inverter via an ethernet link, such as a digital signal processor (Digital Signal Processing, DSP) that sends the control information to the photovoltaic inverter via a man-machine interface (HumanMachineInterface, HMI) of the photovoltaic inverter. The energy management system EMS may communicate with the DC/DC controller via an ethernet link. The photovoltaic inverter DC/AC may communicate with the DC/DC controller via an RS485 bus, for example, the photovoltaic inverter DC/AC may send information such as operation information, on-off instructions, power instructions, and inverter minimum bus voltage to the DC/DC controller. The energy storage device Battery may send Battery information collected by a Battery management system (BatteryManagement System, BMS) running thereon to the DC/DC controller using an RS485 bus or a CAN bus.

In some embodiments, the photovoltaic inverter DC/AC may comprise a plurality of inverter units DC/AC, and the DC/DC controller may comprise a plurality of DC/DC sub-controllers, wherein each DC/DC sub-controller may be connected to one energy storage device. For this, different communication architectures may be used for control.

As shown in fig. 2, a DC parallel communication architecture is provided, in which an RS485 bus may be used, all inverter units DC/AC and energy storage devices (for convenience of understanding, the energy storage devices are not shown in fig. 2, but DC/DC sub-controllers corresponding to the energy storage devices are shown) are hung on the same RS485 bus, and a photovoltaic inverter is used as a host to perform unified scheduling and control on each inverter unit DC/AC and the energy storage devices.

As shown in fig. 3, a direct current independent communication architecture is provided, and each inverter unit DC/AC is used as an independent host to control a corresponding energy storage device.

Optionally, in consideration of the situation that the photovoltaic panel stops generating electricity or the DC/DC controller stops running in the running process of the optical storage system, in order to ensure the slow start or grid connection requirement of the photovoltaic inverter, a rectifier bridge stack unit can be added in the optical storage system.

As shown in fig. 4, the optical storage system may further include a rectifying bridge unit, one end of the rectifying bridge unit is electrically connected to the DC bus DC of the photovoltaic inverter DC/AC through the second circuit breaker, and the other end of the rectifying bridge unit is electrically connected to the Grid system Grid.

Specifically, when the photovoltaic panel stops generating electricity and the DC/DC controller stops running due to the failure of the DC/DC controller or the exhaustion of the electric quantity of the energy storage equipment, the direct current bus DC of the photovoltaic inverter DC/AC is in a non-energy state, and at the moment, energy can be provided for the direct current bus DC of the photovoltaic inverter DC/AC through the rectifier bridge reactor unit so as to enable the photovoltaic inverter DC/AC to be slowly started or connected in a grid.

As shown in fig. 5, the embodiment of the present invention further provides a control method of an optical storage system, where the control method may be applied to an optical storage system adopting the above optical storage system architecture, and the control method may include the following steps:

step S510, when the photovoltaic inverter receives the control information of the management system, the photovoltaic inverter generates inversion information corresponding to the control information and sends the inversion information to the DC/DC controller.

In some embodiments, the management system may send control information carrying control instructions to the photovoltaic inverter, such as photovoltaic inverter startup instructions, night SVG instructions, energy storage charging instructions, etc. In this manner, when the photovoltaic inverter receives control information of the management system, the photovoltaic inverter may generate inversion information corresponding to the control information, for example, inversion information carrying a rectification state identification or an inversion state identification, and may transmit the inversion information to the DC/DC controller.

Step S520, the DC/DC controller executes charge/discharge processing corresponding to the inversion information.

In some embodiments, the DC/DC controller may perform charge and discharge processing corresponding to the inversion information after receiving the inversion information transmitted by the photovoltaic inverter.

In some embodiments, the DC/DC controller may perform the charging process when the inversion information carries a rectifying status flag.

In addition, the photovoltaic inverter may also obtain the charging power of the energy storage device when the DC/DC controller performs the charging process. After that, the photovoltaic inverter may perform a voltage-stabilizing rectification process corresponding to the rectification power, based on the rectification power corresponding to the charging power, that is, the power absorbed from the power transmission Grid.

In some embodiments, the DC/DC controller may perform the discharging process when the inversion information carries an inversion status flag.

In addition, when the DC/DC controller performs discharge processing, the photovoltaic inverter can also acquire the power generated by the photovoltaic panel and the power discharged by the energy storage device. And then, if the sum of the generated power and the discharge power is smaller than the power limit value of the photovoltaic inverter, the photovoltaic inverter executes voltage stabilizing inversion processing corresponding to the preset power so as to track the maximum power of the photovoltaic cell panel. If the sum of the generated power and the discharged power is greater than or equal to the power limit value of the photovoltaic inverter, the photovoltaic inverter may perform a constant power inversion process, at which time the bus voltage may be balanced by the front and rear power and automatically maintained at a certain voltage, for example, stabilized at a voltage stabilizing point of DC/DC.

In the charge/discharge process, the DC/DC controller generally performs constant-power charge or discharge. In addition, the upper limit and the lower limit of the voltage can be subjected to amplitude limiting treatment through the bus voltage ring, so that the situation that bus overvoltage is caused by overdischarge or bus undervoltage is caused by overcharge is prevented.

Optionally, in order to avoid the situation of energy reverse-irrigation of the photovoltaic cell panel, the power generation power of the photovoltaic cell panel can be periodically detected, and then corresponding processing is executed through the relation between the power generation power and the reverse-irrigation power, namely, the critical power of the energy reverse-irrigation photovoltaic cell panel is generated. If the generated power of the photovoltaic cell panel is detected to be smaller than the reverse irrigation power, the first circuit breaker can be disconnected, so that the energy reverse irrigation of the photovoltaic cell panel can be avoided.

In addition, in order to ensure normal power generation of the photovoltaic panel, the first circuit breaker may be closed under the condition that the voltage of the photovoltaic panel is greater than a preset starting voltage. Specifically, the voltage of the photovoltaic cell panel can be periodically detected, and when the voltage of the photovoltaic cell panel is detected to be larger than the preset starting voltage, the first circuit breaker is closed so as to ensure the normal power generation of the photovoltaic cell panel.

It should be noted that, the power generation power of the photovoltaic cell panel can be calculated by detecting the voltage and the current of the photovoltaic cell panel. In addition, in order to reduce the action times of the first circuit breaker, when the energy transmitted to the photovoltaic inverter by the photovoltaic panel and the DC/DC controller is required to be reduced when power scheduling or primary frequency modulation and the like are encountered, certain power output of the photovoltaic panel can be maintained.

For example, if the DC/DC controller performs the discharge process, the discharge power may be reduced, even switched to perform the charge process; if the DC/DC controller performs the charging process, the charging power may be increased if conditions allow.

Optionally, for the optical storage system added with the rectifier bridge unit, the opening and closing of the second circuit breaker can be controlled according to the detected opening and closing state of the first circuit breaker and the working state of the photovoltaic inverter DC/AC, for example, the starting state of the photovoltaic inverter DC/AC and the voltage of the direct current bus DC.

Specifically, when it is detected that the photovoltaic inverter is in a power-on ready state, the first circuit breaker is in an open state, and the voltage of the direct current bus is smaller than a preset voltage threshold, it can be considered that the direct current bus DC of the photovoltaic inverter DC/AC is in a non-energy state at this time, so that the second circuit breaker can be closed, and energy can be provided for the direct current bus DC of the photovoltaic inverter DC/AC through the rectifier bridge reactor unit, so that the photovoltaic inverter DC/AC is slowly started or connected in a grid.

Accordingly, the second circuit breaker may be opened when it is detected that the photovoltaic inverter DC/AC has been grid-connected, e.g. the voltage of the direct current bus DC is greater than a preset voltage threshold.

It should be noted that the optical storage system provided in the embodiment of the present invention further has a plurality of control modes, as shown in table one.

List one

To facilitate an understanding of the various control modes described above, reference may be made to the corresponding energy flow schematic diagrams of FIGS. 6-12. Specifically, fig. 6 is an energy flow diagram of mode 1, fig. 7 is an energy flow diagram of mode 2, fig. 8 is an energy flow diagram of mode 3, fig. 9 is an energy flow diagram of mode 4 and mode 5, fig. 10 is an energy flow diagram of mode 6 and mode 7, fig. 11 is an energy flow diagram of mode 8, and fig. 12 is an energy flow diagram of mode 9.

Further, as shown in fig. 13, fig. 13 shows a mode switching diagram, and when the respective conditions are satisfied, the modes described above can be switched accordingly.

In the embodiment of the invention, the energy storage interface can be added at the DC bus of the inverter, so that the energy storage equipment can be fused with the photovoltaic power station, and the energy storage equipment is scheduled by the photovoltaic inverter, so that the combined control effect of the photovoltaic inverter and the energy storage equipment is improved, the energy loss is reduced, and the running cost of the photovoltaic storage system can be reduced.

Based on the control method provided by the above embodiment, correspondingly, the invention further provides a specific implementation mode of a control system applied to the control method, and the control system comprises:

the photovoltaic inverter is used for generating inversion information corresponding to the control information when receiving the control information of the management system and sending the inversion information to the DC/DC controller;

and a DC/DC controller for performing charge and discharge processing corresponding to the inversion information.

Optionally, the DC/DC controller is further configured to:

when the inversion information carries a rectifying state identifier, charging is carried out;

and when the inversion information carries the inversion state identification, executing discharge processing.

Optionally, the photovoltaic inverter is further configured to:

when the DC/DC controller executes discharge treatment, the power generation power of the photovoltaic cell panel and the discharge power of the energy storage device are obtained;

and if the sum of the generated power and the discharge power is smaller than the power limit value of the photovoltaic inverter, performing voltage stabilizing inversion processing corresponding to the preset power, otherwise, performing constant power inversion processing.

Optionally, the photovoltaic inverter is further configured to:

when the DC/DC controller executes charging processing, acquiring charging power of the energy storage equipment;

and performing voltage stabilizing rectification processing corresponding to the rectification power according to the rectification power corresponding to the charging power.

Optionally, the control system further comprises a detector for:

Optionally, the detector is further configured to:

In the embodiment of the invention, when receiving the control information of the management system, the photovoltaic inverter can generate the inversion information corresponding to the control information and send the inversion information to the DC/DC controller. After that, the DC/DC controller may perform charge and discharge processing corresponding to the inversion information. Therefore, the energy storage equipment and the photovoltaic power station can be fused, and the energy storage equipment is scheduled by the photovoltaic inverter, so that the combined control effect of the photovoltaic inverter and the energy storage equipment is improved, the energy loss is reduced, and the operation cost of the photovoltaic storage system can be reduced.

Fig. 14 is a schematic diagram of a terminal device provided in an embodiment of the present invention, where the terminal device may be a photovoltaic inverter, a DC/DC controller or a detector in an optical storage system. As shown in fig. 14, the terminal device 14 of this embodiment includes: a processor 140, a memory 141 and a computer program 142 stored in said memory 141 and executable on said processor 140. The processor 140, when executing the computer program 142, implements the steps of the control method embodiments of the respective optical storage systems described above. Alternatively, the processor 140, when executing the computer program 142, performs the functions of the modules/units of the apparatus embodiments described above.

Illustratively, the computer program 142 may be partitioned into one or more modules/units that are stored in the memory 141 and executed by the processor 140 to accomplish the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program 142 in the terminal device 14.

The terminal device may include, but is not limited to, a processor 140, a memory 141. It will be appreciated by those skilled in the art that fig. 14 is merely an example of a terminal device 14 and is not intended to limit the terminal device 14, and may include more or fewer components than shown, or may combine certain components, or different components, e.g., the terminal device may further include an input-output device, a network access device, a bus, etc.

The processor 140 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 141 may be an internal storage unit of the terminal device 14, such as a hard disk or a memory of the terminal device 14. The memory 141 may be an external storage device of the terminal device 14, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like, which are provided on the terminal device 14. Further, the memory 141 may also include both an internal storage unit and an external storage device of the terminal device 14. The memory 141 is used to store the computer program and other programs and data required by the terminal device. The memory 141 may also be used to temporarily store data that has been output or is to be output.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other manners. For example, the apparatus/terminal device embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical function division, and there may be additional divisions in actual implementation, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.

The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.

Claims

1. The control method of the light storage system is characterized by being applied to the light storage system, wherein the light storage system comprises a photovoltaic cell panel, a converging unit, energy storage equipment, a DC/DC controller and a photovoltaic inverter; the photovoltaic cell panel is electrically connected with one end of the converging unit, the other end of the converging unit is electrically connected with a direct current bus of the photovoltaic inverter through the first circuit breaker, and an alternating current bus of the photovoltaic inverter is used for being electrically connected with the power transmission network system; the energy storage device is electrically connected with a first direct current end of the DC/DC controller, and a second direct current end of the DC/DC controller is electrically connected with the direct current bus; the photovoltaic inverter is respectively connected with the management system and the DC/DC controller through a network link, and the DC/DC controller is respectively connected with the management system and the energy storage equipment through the network link; the method comprises the following steps:

when the photovoltaic inverter receives control information of the management system, the photovoltaic inverter generates inversion information corresponding to the control information and sends the inversion information to the DC/DC controller; wherein, the inversion information carries a rectification state identifier or an inversion state identifier;

and when receiving inversion information carrying the rectifying state identification or the inversion state identification, the DC/DC controller respectively executes charging processing or discharging processing.

2. The control method according to claim 1, characterized in that the method further comprises:

and if the sum value of the generated power and the discharge power is smaller than the power limit value of the photovoltaic inverter, the photovoltaic inverter executes voltage stabilizing inversion processing corresponding to preset power, otherwise, the photovoltaic inverter executes constant power inversion processing.

3. The control method according to claim 1, characterized in that the method further comprises:

when the DC/DC controller executes charging processing, the photovoltaic inverter acquires charging power of the energy storage equipment;

4. The control method according to claim 1, characterized in that the method further comprises:

and closing the first circuit breaker when the voltage of the photovoltaic cell panel is detected to be larger than a preset starting voltage.

5. The control method according to claim 1, wherein the optical storage system further comprises a rectifier bridge unit, one end of the rectifier bridge unit is electrically connected with the direct current bus through a second circuit breaker, and the other end of the rectifier bridge unit is electrically connected with the power transmission network system; the method further comprises the steps of:

and closing the second circuit breaker when the photovoltaic inverter is detected to be in a starting ready state, the first circuit breaker is in an open state and the voltage of the direct current bus is smaller than a preset voltage threshold value.

6. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method according to any one of claims 1 to 5.