A photovoltaic storage direct-current flexible power distribution system and its control method

Abstract

The present invention provides a photovoltaic storage direct current flexible power distribution system and its control method, wherein the system includes: multiple substation systems installed in multiple substation energy stations and multiple household subsystems installed in multiple household energy walls; the substation system includes equipment such as a static transfer switch, an isolation transformer and a bidirectional energy converter, and the substation system draws power from the power grid to supply the DC bus; the household subsystem includes: photovoltaic components, energy storage modules, charging piles, DC loads, AC loads and an energy management system controller, and the household subsystem is connected to the DC bus; multiple substation systems are connected to the lower end of the static transfer switch, and multiple household subsystems are connected through the DC bus. The photovoltaic storage direct current flexible power distribution system provided by the embodiment of the present invention can perfectly adapt to the interaction between the power grid and substations, substations and substations, substations and households, and households and households, combine multiple substations into a whole, improve the power dispatching capability, and better achieve peak shaving and valley filling and response to virtual power plants.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a photovoltaic-storage-direct-flexible power distribution system and a control method thereof. Background Art

[0002] As a key component of the new power system, PV-storage-DC-flexible technology represents a new direction for building energy conservation. This technology integrates four key elements: photovoltaic power generation, energy storage, DC power distribution, and flexible power consumption. It aims to improve energy efficiency, achieve zero-carbon electricity based on renewable energy, and alleviate pressure on the power grid by shifting peak loads and filling valleys.

[0003] However, currently, the connection between PV-storage direct-flexible systems and the grid is mostly based on individual buildings or households, and there is a lack of interaction between different small-unit PV-storage direct-flexible systems. When connecting to the grid and responding to grid tasks, the system needs to have characteristics such as large capacity, strong system stability, and fast response. This makes it difficult for a large number of small-scale PV-storage direct-flexible systems to interact well with the grid. From the perspective of energy utilization, the load scale of small-scale systems is not large, making their photovoltaic absorption rate and energy storage utilization rate lower than that of large-scale substation microgrid systems. Therefore, there is an urgent need for a PV-storage direct-flexible distribution system that combines substations and households. Summary of the Invention

[0004] In order to solve the existing technical problems, the embodiments of the present invention provide a photovoltaic energy storage direct current flexible power distribution system and a control method thereof.

[0005] In the first aspect, an embodiment of the present invention provides a photovoltaic storage direct current flexible power distribution system, comprising: multiple substation systems installed in multiple substation energy stations and multiple household subsystems installed in multiple household energy walls; the substation system includes at least: a static transfer switch, an isolation transformer and a bidirectional energy converter, and the substation system draws power from the power grid to supply the DC bus; the household subsystem includes at least: photovoltaic components, energy storage modules, charging piles, DC loads, AC loads and energy management system controllers, and the household subsystems are connected to the DC bus; multiple substation systems are connected to the lower end of the static transfer switch, and multiple household subsystems are connected through the DC bus.

[0006] Optionally, the substation system supplies the DC bus through the static transfer switch, the isolation transformer and the bidirectional energy converter; or, the substation system also includes: other loads, which are connected to the DC bus through the bidirectional energy converter.

[0007] Optionally, the household subsystem also includes: a photovoltaic combiner box, a chopper, an inverter and an automatic transfer switch; the photovoltaic components are combined into the photovoltaic combiner box and maintain maximum power output to the DC bus through the photovoltaic converter; the energy storage module is connected to the DC bus through the energy storage converter; the charging pile is connected to the DC bus through the DC-DC bidirectional converter; the lower end of the inverter is connected to the automatic transfer switch and connected to the AC bus.

[0008] Optionally, the energy management system controller includes: a broadcast addressing module, a re-addressing module and an address code allocation module; the broadcast addressing module is used to perform broadcast active addressing operations on each device after the system is started; the re-addressing module is used to re-address when an abnormality or timeout occurs in the response of each device to the message sent back to the energy management system controller until each device is successfully connected; the address code allocation module is used to allocate corresponding address codes to each device to identify the number and type of connected devices.

[0009] Optionally, the communication mode between the energy management system controllers at the same level adopts a host election mode.

[0010] Optionally, the energy management system controller further includes: a sentinel process.

[0011] In a second aspect, an embodiment of the present invention further provides a control method, which is applicable to any one of the photovoltaic storage direct-current flexible distribution systems described above, including: an operation scheduling mode of a substation energy station and an operation scheduling mode of a household energy wall.

[0012] In a third aspect, an embodiment of the present invention provides an electronic device comprising a processor and a memory, wherein the memory stores a computer program, and the processor executes the computer program stored in the memory, and when the computer program is executed by the processor, the control method described in the second aspect is implemented.

[0013] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the control method described in the second aspect above.

[0014] In a fifth aspect, the present application also provides a computer program product, including a computer program, which, when executed, can implement the control method described in the second aspect above.

[0015] The photovoltaic storage direct flexible distribution system provided in the first aspect of the embodiment of the present invention is an electrical system that can combine substations with households. It can perfectly adapt to the interaction between the power grid and substations, substations and substations, substations and households, and households and households, and combine multiple substations into a whole. The power dispatching capability is greatly improved, and it can better achieve peak shaving and valley filling and respond to virtual power plants and other tasks.

[0016] The control method provided in the second aspect of the embodiment of the present invention adopts voltage grading and system grading strategies, so that the system supports off-grid mode and can be used as disaster recovery standby; the multi-host switching mode can ensure that the remaining systems can still operate normally when individual systems fail; it can use green electricity more efficiently, and can supply excess photovoltaic power to different household systems and substation systems, thereby improving the photovoltaic absorption rate; it can also combine multiple substations into a whole, greatly improving the power dispatching capability, and better realizing peak shaving and valley filling and responding to virtual power plants and other tasks. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the background technology, the drawings required for use in the embodiments of the present invention or the background technology will be described below.

[0018] Figure 1 The following is a schematic diagram showing the architecture of a photovoltaic storage and direct-flexible power distribution system provided by an embodiment of the present invention;

[0019] Figure 2 The following is a schematic diagram showing the control flow of the energy management system controller and the equipment docking in the PV-storage direct-current flexible power distribution system provided by an embodiment of the present invention;

[0020] Figure 3 A schematic diagram showing a communication method between energy management system controllers at the same level in a PV-storage direct current flexible power distribution system provided by an embodiment of the present invention;

[0021] Figure 4 The figure shows a communication flow diagram of the operation scheduling mode of the energy station in the substation in the control method provided by the embodiment of the present invention;

[0022] Figure 5 A schematic diagram of the communication process in the operation scheduling mode of the household energy wall in the control method provided by an embodiment of the present invention is shown;

[0023] Figure 6 A schematic structural diagram of an electronic device for executing a control method provided by an embodiment of the present invention is shown.

[0024] Reference numerals:

[0025] 1-Substation system, 2-Household subsystem, 11-Static transfer switch, 12-Isolation transformer, 13-Bidirectional energy converter, 21-PV panel, 22-Energy storage module, 23-Charging pile, 24-DC load, 25-AC load, 26-Energy management system controller, 27-PV combiner box, 28a-PV converter, 28b-Energy storage converter, 28c-DC-DC bidirectional converter, 29-Inverter, 20-Automatic transfer switch. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described below with reference to the accompanying drawings.

[0027] Figure 1 FIG1 shows a schematic diagram of the architecture of a photovoltaic storage and direct-flexible power distribution system provided by an embodiment of the present invention. Figure 1 As shown, Figure 1 It includes multiple substation energy stations, such as substation energy station #1, substation energy station #2, etc. A substation energy station can include multiple household energy walls, such as substation energy station #1 can include #1 household energy wall, #2 household energy wall, #3 household energy wall... Substation energy station #2 can include #1 household energy wall, #2 household energy wall, #3 household energy wall... In the photovoltaic storage direct current flexible power distribution system provided in the embodiment of the present invention, it includes multiple substation systems 1 installed in multiple substation energy stations, multiple household subsystems 2 installed in multiple household energy walls, and a DC bus. That is to say, each substation energy station is equipped with a corresponding substation system 1, and each household energy wall is equipped with a corresponding household subsystem 2. From Figure 1 It is not difficult to see that the household energy walls belonging to the same substation are connected to the substation through a DC bus, where the voltage of the DC bus is 375V.

[0028] Specifically, the substation system 1 installed in the substation energy station includes at least: a static transfer switch 11, an isolation transformer 12, and a bidirectional energy converter 13. The substation system 1 draws power from the grid to supply the DC bus. The static transfer switch 11 is an STS (Static Transfer Switch), and the bidirectional energy converter 13 is a bidirectional AC / DC (Alternating Current / Direct Current) converter with an AC / DC voltage of 380V / 375V; see Figure 1 As shown, Figure 1 The power grid is shown in the lower left corner. The substation system 1 can draw power from the power grid to supply the DC bus. It should be noted that the substation system 1 does not draw power from the power grid all the time.

[0029] Furthermore, the household subsystem 2 installed in the household energy wall includes at least: photovoltaic panels 21, energy storage modules 22, charging stations 23, DC loads 24, AC loads 25, and an energy management system controller 26. The output of the household subsystem 2 is connected to the DC bus. The energy storage module 22 can be a lead-carbon battery or a lithium battery. The charging station 23 is used to charge electric vehicles and is a V2G (Vehicle-to-Grid) charging station that supports bidirectional charging and discharging. The DC loads 24 are indoor DC loads and share a 375V to 48V DC bus, i.e., a voltage of 48V. The AC loads 25 are indoor AC loads and share a 220V DC to AC bus. The energy management system controller 26 is an EMS (Energy Management System) controller.

[0030] In this embodiment of the present invention, multiple substation systems 1 are connected to the lower end of a static transfer switch 11. This interconnection point prevents uneven power consumption across substations, which could lead to reverse current flow and disrupt grid power quality. Multiple household subsystems 2 are connected via a DC bus, meaning the energy walls between each household are connected via the DC bus.

[0031] The photovoltaic storage direct flexible distribution system provided in the embodiment of the present invention is an electrical system that can combine substations with households. It can perfectly adapt to the interaction between the power grid and substations, substations and substations, substations and households, and households and households, combining multiple substations into a whole, greatly improving the power dispatching capability, and better realizing peak shaving and valley filling and responding to virtual power plants.

[0032] Alternatively, as Figure 1 As shown, substation system 1 supplies the DC bus via a static transfer switch 11, an isolation transformer 12, and a bidirectional energy converter 13. A backflow prevention meter can also be installed above the inter-substation system transmission nodes. This meter monitors whether substation system 1 is secretly "leaking" power to the grid when the host is disabled. If so, it notifies the inverter (ACDC converter) to adjust and cut off the reverse current. Substation system 1 also has module expansion capabilities. Modules such as energy storage, DC charging stations, and photovoltaics can be added to the substation system. These modules can be placed below the bidirectional energy converter 13 and directly connected to the DC bus.

[0033] Alternatively, as Figure 1 As shown, the household subsystem 2 may further include: a photovoltaic combiner box 27 , a photovoltaic converter 28 a , an energy storage converter 28 b , a DC-DC bidirectional converter 28 c , an inverter 29 and an automatic transfer switch 20 .

[0034] Among them, the photovoltaic converter 28a is a DC / DC (direct current / direct current) converter, and the photovoltaic components 21 are converged to the photovoltaic junction box 27 and maintain the maximum power output to the 375V DC bus through the photovoltaic converter 28a (DC / DC converter). The energy storage module 22 is connected to the DC bus through the energy storage converter 28b (DC / DC converter), which can support power supply from the DC bus and power supply to the DC bus. The V2G charging pile 23 is connected to the DC bus through the DC-DC bidirectional converter 28c (DC / DC converter), which supports electric vehicles to supply power to the microgrid. The inverter 29 is a DC / AC (direct current / alternating current) inverter, and the automatic transfer switch 20 is an ATS (Automatic Transfer Switching, automatic transfer switch, commonly known as dual power supply) bidirectional converter. The lower end of the inverter 29 is connected to the automatic transfer switch 20 and is connected to the AC bus, such as Figure 1 As shown, the second circuit (such as the circuit pointed by the horizontal pin) of the automatic transfer switch 20 is connected to the local 220V AC bus. This step is to ensure that high-power or high-power-consuming equipment can operate without power interruption.

[0035] Optionally, the energy management system controller 26 includes: a broadcast addressing module, a re-addressing module, and an address code allocation module. The broadcast addressing module is used to perform broadcast-type active addressing operations on each device after the system is started. The re-addressing module is used to re-address when an abnormality or timeout occurs in the response of each device to the message sent back to the energy management system controller 26, until each device is successfully connected. It can be understood that after the energy management system controller 26 (EMS controller) performs a broadcast-type active addressing operation, each device will respond to the message sent back to the EMS. If an abnormality or timeout occurs, the EMS will re-address until all devices are successfully connected, and communication between the device and the EMS is established. Furthermore, the address code allocation module is used to assign a corresponding address code to each device to identify the number and type of connected devices. That is to say, after establishing the communication between the device and the energy management system controller 26, the EMS will assign an address code to each type of device (such as photovoltaic DC / DC, energy storage DC / DC, etc.) to identify the number and type of devices connected to the EMS. This allows plug-and-play of devices and supports dynamic expansion of devices such as photovoltaic energy storage loads and dynamic expansion of projects. For example, for each device of each type, assuming that the photovoltaic DC / DC converter uses 0x101~0x150 and the energy storage device DC / DC uses 0x201~0x250, the prefix indicates the device type and the following indicates the number of the device. Figure 2 As shown, Figure 2 A schematic diagram of the control flow of the energy management system controller 26 (EMS controller) connecting to the equipment is shown.

[0036] Alternatively, as Figure 3 As shown, Figure 3 A schematic diagram illustrates the communication between energy management system controllers 26 (EMS) at the same level. In this embodiment of the present invention, communication between EMS controllers 26 at the same level utilizes a master election model. Specifically, one EMS controller 26 acts as the master and issues scheduling commands to slaves. Furthermore, the EMS controller 26 also includes a sentinel process. This process is an independent process within the EMS controller 26. The sentinel process operates independently of the EMS controller 26 program. It monitors the status of all devices by periodically broadcasting commands to all EMS controllers 26 and checking for response messages from each EMS controller 26. If multiple sentinels fail to receive a response from the master, a failover operation is initiated, selecting another EMS controller 26 as the master system. Once selected, the sentinel mode and other devices are broadcast, allowing each sentinel to switch masters for the servers it monitors. This multi-master switching model ensures that even if a single system fails, the remaining systems can still operate normally.

[0037] An embodiment of the present invention further provides a control method, which is applicable to any of the above-mentioned photovoltaic storage direct-current flexible distribution systems, including: an operation scheduling mode of a substation energy station and an operation scheduling mode of a household energy wall.

[0038] Specifically, see Figure 4 As shown, Figure 4 The diagram shows the communication flow in the operation and scheduling mode of the substation energy station. The operation and scheduling mode of the substation energy station includes: first, after the substation energy station is started, it will perform a handshake operation with the household energy wall under the substation energy station system, obtain the consumption status of the slave energy wall, and summarize it to the energy station for statistical scheduling, and this cycle continues. At the same time, the substation energy station will perform a handshake operation with other substation energy stations; if the candidate entity is the host, it will summarize the energy consumption of this energy station and obtain the energy consumption status of the slave energy station, so as to perform energy station-level energy scheduling and send instructions to the household energy wall. If it is not the host, it will determine whether it has a host. If it has a host, it will summarize the device information and obey the host energy station scheduling as a slave device; if there is no host, it will try to run for election. If successful, it will perform the host's duties. If it fails, it will control the household energy wall as an independent system; when there is a sudden disconnection with the host, it will also control the household energy wall as an independent system.

[0039] In addition, see Figure 5 As shown, Figure 5The diagram shows the communication flow of a household energy wall in operation and scheduling mode. The operation and scheduling mode of a household energy wall involves the following steps: First, the household energy wall performs a handshake operation with the master device (energy station). If successful, the household energy wall acts as a slave, listens to the master's heartbeat, calculates the local energy wall's energy consumption status, and outputs it to the master device. It then waits for and executes host commands. If no host heartbeat is detected, the local energy wall calculates its own energy consumption status and becomes an independent system for energy scheduling. If the handshake with the master (energy station) fails at the outset, the local energy wall broadcasts to other energy walls in the local area network and determines whether it is the master. If it is the master, it performs the master role—controlling household energy walls in the same area system. If not, the local energy wall broadcasts to all energy walls, starting the master election process. If the master election process succeeds, the household energy wall performs the master role—controlling household energy walls in the same area system. If it fails, the local energy wall performs information collection and response services. If there is a conflict with the master energy wall, the household energy wall operates as an independent system.

[0040] Under the dispatch control of this regulation method, the system dynamically switches power supplies to ensure bus voltage stability. For example, in the self-operating energy station mode, the AC / DC converters in the substations maintain a constant voltage mode to stabilize the DC bus voltage, while the photovoltaic system maintains maximum power output mode and the energy storage system operates in a constant power output mode based on demand. When a substation receives a request from the host to supply power to another energy station or the grid, the AC / DC converters in that substation switch to constant power mode, and the DC / DC energy storage systems in several household energy walls with preset address codes switch to constant voltage mode to maintain bus voltage stability.

[0041] The control method provided in the embodiment of the present invention adopts voltage classification and system classification strategies, so that the system supports off-grid mode and can be used as disaster recovery standby; the multi-host switching mode can ensure that the remaining systems can still operate normally when individual systems fail; it can use green electricity more efficiently, and can supply excess photovoltaic power to different household systems and substation systems, thereby improving the photovoltaic absorption rate; it can also combine multiple substations into a whole, greatly improving the power scheduling capability, and better realizing peak shaving and valley filling and responding to virtual power plants and other tasks.

[0042] According to one aspect of the present application, an embodiment of the present invention further provides a computer program product, comprising a computer program containing program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via a communication component. When the computer program is executed by a processor, the control method provided in the embodiment of the present application is performed.

[0043] In addition, an embodiment of the present invention also provides an electronic device, including a bus, a transceiver, a memory, a processor, and a computer program stored in the memory and runnable on the processor. The transceiver, the memory, and the processor are respectively connected via a bus. When the computer program is executed by the processor, the various processes of the above-mentioned control method embodiment are implemented and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0044] For details, see Figure 6 As shown, the electronic device includes a bus 1110 , a processor 1120 , a transceiver 1130 , a bus interface 1140 , a memory 1150 , and a user interface 1160 .

[0045] In an embodiment of the present invention, the electronic device further includes: a computer program stored in the memory 1150 and executable on the processor 1120 , and when the computer program is executed by the processor 1120 , each process of the above-mentioned control method embodiment is implemented.

[0046] The transceiver 1130 is configured to receive and send data under the control of the processor 1120 .

[0047] In an embodiment of the present invention, a bus architecture (represented by bus 1110 ) may include any number of interconnected buses and bridges, and bus 1110 connects various circuits including one or more processors represented by processor 1120 and a memory represented by memory 1150 .

[0048] Bus 1110 represents one or more of any of several types of bus structures, including a memory bus and memory controller, a peripheral bus, an Accelerated Graphical Port (AGP), a processor, or a local bus using any of a variety of bus architectures. By way of example and not limitation, such architectures include an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MCA) bus, an Enhanced ISA (EISA) bus, a Video Electronics Standards Association (VESA) bus, and a Peripheral Component Interconnect (PCI) bus.

[0049] Processor 1120 can be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above-described method embodiment can be completed by hardware integrated logic circuits in the processor or by software instructions. Such processors include: general-purpose processors, central processing units (CPUs), network processors (NPs), digital signal processors (DSPs), application-specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), complex programmable logic devices (CPLDs), programmable logic arrays (PLAs), microcontroller units (MCUs), or other programmable logic devices, discrete gates, transistor logic devices, or discrete hardware components. The methods, steps, and logic block diagrams disclosed in the embodiments of the present invention can be implemented or executed. For example, the processor can be a single-core processor or a multi-core processor, and the processor can be integrated into a single chip or located on multiple different chips.

[0050] Processor 1120 can be a microprocessor or any conventional processor. The method steps disclosed in conjunction with the embodiments of the present invention can be performed directly by a hardware decoding processor, or by a combination of hardware and software modules within the decoding processor. The software modules can be located in a readable storage medium known in the art, such as random access memory (RAM), flash memory, read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), or registers. The readable storage medium is located in a memory, and the processor reads the information in the memory and, in conjunction with its hardware, completes the steps of the method described above.

[0051] The bus 1110 may also connect various other circuits, such as peripheral devices, voltage regulators, or power management circuits. The bus interface 1140 provides an interface between the bus 1110 and the transceiver 1130. These are all well known in the art and are therefore not further described in this embodiment of the present invention.

[0052] The transceiver 1130 can be a single component or multiple components, such as multiple receivers and transmitters, providing a means for communicating with various other devices over a transmission medium. For example, the transceiver 1130 receives external data from other devices and transmits data processed by the processor 1120 to other devices. Depending on the nature of the computer system, a user interface 1160 may also be provided, such as a touch screen, physical keyboard, display, mouse, speaker, microphone, trackball, joystick, or stylus.

[0053] It should be understood that in an embodiment of the present invention, the memory 1150 may further include a memory remotely located relative to the processor 1120, and these remotely located memories may be connected to a server via a network. One or more parts of the aforementioned network may be an ad hoc network, an intranet, an extranet, a virtual private network (VPN), a local area network (LAN), a wireless local area network (WLAN), a wide area network (WAN), a wireless wide area network (WWAN), a metropolitan area network (MAN), the Internet, a public switched telephone network (PSTN), a plain old telephone service (POTS), a cellular telephone network, a wireless network, a wireless fidelity (Wi-Fi) network, or a combination of two or more of the aforementioned networks. For example, the cellular telephone network and the wireless network may be a Global System for Mobile Communications (GSM) system, a Code Division Multiple Access (CDMA) system, a Worldwide Interoperability for Microwave Access (WiMAX) system, a General Packet Radio Service (GPRS) system, a Wideband Code Division Multiple Access (WCDMA) system, a Long Term Evolution (LTE) system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD) system, an Advanced Long Term Evolution (LTE-A) system, a Universal Mobile Telecommunications (UMTS) system, an Enhanced Mobile Broadband (eMBB) system, a Massive Machine Type of Communication (mMTC) system, an Ultra Reliable Low Latency Communications (uRLLC) system, and the like.

[0054] It should be understood that the memory 1150 in the embodiment of the present invention may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Non-volatile memories include read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory.

[0055] Volatile memory includes random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronized DRAM (SLDRAM), and direct RAM bus (DRRAM). The memory 1150 of the electronic device described in the embodiments of the present invention includes, but is not limited to, the aforementioned and any other suitable types of memory.

[0056] In the embodiment of the present invention, the memory 1150 stores the following elements of the operating system 1151 and the application 1152: executable modules, data structures, or subsets thereof, or extended sets thereof.

[0057] Specifically, operating system 1151 includes various system programs, such as a framework layer, a core library layer, and a driver layer, which implement various basic services and handle hardware-based tasks. Application programs 1152 include various application programs, such as a media player and a browser, which implement various application services. Programs implementing the methods of the embodiments of the present invention may be included in application programs 1152. Application programs 1152 include applets, objects, components, logic, data structures, and other computer system-executable instructions that perform specific tasks or implement specific abstract data types.

[0058] In addition, an embodiment of the present invention also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the various processes of the above-mentioned control method embodiment are implemented and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0059] Computer-readable storage media include both permanent and non-permanent, removable and non-removable media, and are tangible devices that can retain and store instructions for use by an instruction execution device. Computer-readable storage media include electronic storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, and any suitable combination of the foregoing. Computer-readable storage media include phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), non-volatile random access memory (NVRAM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette storage, magnetic disk storage or other magnetic storage devices, memory sticks, mechanical encoding devices (such as punched cards or raised structures with instructions recorded in grooves), or any other non-transmission medium that can be used to store information accessible by a computing device. As defined in the embodiments of the present invention, computer-readable storage media does not include temporary signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (such as light pulses passing through fiber optic cables), or electrical signals transmitted through wires.

[0060] In the several embodiments provided in this application, it should be understood that the disclosed devices, electronic devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, or can be an electrical, mechanical or other form of connection.

[0061] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, and may be located in a single location or distributed across multiple network units. Some or all of these units may be selected based on actual needs to address the issues addressed by the embodiments of the present invention.

[0062] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0063] If the integrated unit is implemented as a software functional unit and sold or used as a standalone product, it can be stored on a computer-readable storage medium. Based on this understanding, the technical solution of the embodiments of the present invention, or the portion that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product, stored on a storage medium, includes instructions for causing a computer device (including a personal computer, server, data center, or other network device) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes the various media capable of storing program code listed above.

[0064] In describing the embodiments of the present invention, those skilled in the art will appreciate that the embodiments of the present invention can be implemented as methods, apparatuses, electronic devices, and computer-readable storage media. Therefore, the embodiments of the present invention can be implemented in the following forms: entirely in hardware, entirely in software (including firmware, resident software, microcode, etc.), or a combination of hardware and software. Furthermore, in some embodiments, the embodiments of the present invention can also be implemented as a computer program product embodied in one or more computer-readable storage media, wherein the computer-readable storage media contains computer program code.

[0065] The computer-readable storage medium may be any combination of one or more computer-readable storage media. Computer-readable storage media include: electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or components, or any combination thereof. More specific examples of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fiber, compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any combination thereof. In embodiments of the present invention, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, device, or component.

[0066] The computer program code contained in the computer-readable storage medium may be transmitted using any appropriate medium, including wireless, wire, optical cable, radio frequency (RF), or any suitable combination thereof.

[0067] The computer program code for performing the operations of the embodiments of the present invention may be written in assembly language instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, integrated circuit configuration data, or in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages ​​such as C or similar programming languages. The computer program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer or to an external computer via any type of network, including a local area network (LAN) or a wide area network (WAN).

[0068] The embodiments of the present invention describe the provided methods, devices, and electronic devices through flowcharts and / or block diagrams.

[0069] It should be understood that each block in the flowchart and / or block diagram, as well as combinations of blocks in the flowchart and / or block diagram, can be implemented by computer-readable program instructions. These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, thereby producing a machine. These computer-readable program instructions are executed by the computer or other programmable data processing device to produce a device that implements the functions / operations specified in the blocks in the flowchart and / or block diagram.

[0070] These computer-readable program instructions may also be stored in a computer-readable storage medium that enables a computer or other programmable data processing device to operate in a specific manner. In this way, the instructions stored in the computer-readable storage medium produce an instruction device product that implements the functions / operations specified in the blocks in the flowchart and / or block diagram.

[0071] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device, so that a series of operational steps are performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby enabling the instructions executed on the computer or other programmable data processing apparatus to provide a process that implements the functions / operations specified by the blocks in the flowchart and / or block diagram.

[0072] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A solar-storage direct-flexible power distribution system, characterized in that: include: Multiple substation systems (1) installed in multiple substation energy stations and multiple household subsystems (2) installed in multiple household energy walls; wherein each substation energy station is equipped with a corresponding substation system (1); a substation energy station includes multiple household energy walls, and each household energy wall is equipped with a corresponding household subsystem (2); The substation system (1) comprises at least: a static transfer switch (11), an isolation transformer (12), a bidirectional energy converter (13) and a DC busbar connected in sequence, wherein the substation system (1) takes power from the power grid and supplies the power to the DC busbar; The household subsystem (2) comprises at least: a photovoltaic module (21), an energy storage module (22), a charging pile (23), a DC load (24), an AC load (25), and an energy management system controller (26); the household subsystem (2) is connected to the DC bus; A plurality of the substation systems (1) are connected to the lower end of the static transfer switch (11), and a plurality of the household subsystems (2) are connected via the DC bus; The substation system and the household subsystem are connected via the DC bus to achieve power interaction between substations, substations and households, and households and households, thereby improving power dispatching capability and system stability, achieving peak load shifting and responding to virtual power plant operations. The energy management system controller (26) includes: a broadcast addressing module, a re-addressing module and an address code allocation module; The broadcast addressing module is used to perform broadcast active addressing operations on each device after the system is started; The re-addressing module is used to re-address when an abnormality or timeout occurs in the response of each device to the message sent back to the energy management system controller (26) until each device is successfully connected; The address code allocation module is used to allocate corresponding address codes to each device to identify the number and type of connected devices; The communication mode between the energy management system controllers (26) of the same level adopts a host election mode; the energy management system controller (26) of each household subsystem (2) also includes: a sentinel process; The sentinel process runs independently of the energy management system controller (26) program, and detects the status of all devices by broadcasting instructions to all energy management system controllers (26) at regular intervals and checking whether each energy management system controller (26) has a reply message. When multiple sentinel processes do not receive a reply from the host, a failover operation is performed, and another energy management system controller (26) is selected as the host system. After selection, other devices and sentinel modes are broadcasted, so that each sentinel process can switch the host to the server it monitors.

2. The photovoltaic storage direct-flexible power distribution system according to claim 1 is characterized in that: The substation system (1) supplies the DC bus through the static transfer switch (11), the isolation transformer (12) and the bidirectional energy converter (13); or, the substation system (1) further includes: other loads, which are connected to the DC bus through the bidirectional energy converter (13).

3. The photovoltaic storage direct-flexible power distribution system according to claim 1, characterized in that: The household subsystem (2) further includes: a photovoltaic combiner box (27), a photovoltaic converter (28a), an energy storage converter (28b), a DC-DC bidirectional converter (28c), an inverter (29), and an automatic transfer switch (20); The photovoltaic components (21) converge to the photovoltaic junction box (27) and maintain maximum power output to the DC bus through the photovoltaic converter (28a); the energy storage module (22) is connected to the DC bus through the energy storage converter (28b); the charging pile (23) is connected to the DC bus through the DC-DC bidirectional converter (28c); the lower end of the inverter (29) is connected to the automatic transfer switch (20) and is connected to the AC bus.

4. A control method, applicable to any one of the solar-storage direct-current flexible power distribution systems in claims 1-3, characterized in that: include: The operation and dispatching mode of the substation energy station and the operation and dispatching mode of the household energy wall.

5. An electronic device comprising a processor and a memory, wherein the memory stores a computer program, wherein: The processor executes the computer program stored in the memory to implement the control method according to claim 4.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the control method according to claim 4 is implemented.

7. A computer program product, comprising a computer program, which can implement the control method according to claim 4 when the computer program is executed.

Images