Distributed photovoltaic grid-connected system

Abstract

According to the distributed photovoltaic grid-connected system provided by the utility model, the wireless communication chip, the longitudinal encryption chip, the telecontrol machine chip and the power / voltage control chip are integrated in the all-in-one fusion gateway, so that the original four devices are reconstructed into one device; a longitudinal encryption device, a telecontrol machine and an AGVC control module do not need to be independently arranged in the distributed photovoltaic grid-connected system, the installation space is optimized, the cost of the distributed photovoltaic grid-connected system is reduced, in addition, when the distributed photovoltaic grid-connected system is connected, all chip wires in the all-in-one fusion gateway do not need to be connected, and the cost of the all-in-one fusion gateway is reduced. The all-in-one fusion gateway is connected to the distributed photovoltaic grid-connected system, and the wiring mode is simple and fast.

Description

Technical Field

[0001] The utility model relates to the technical field of power grids, and in particular to a distributed photovoltaic grid-connected system. Background Art

[0002] The distributed photovoltaic grid-connected system needs to upload the real-time operation information such as the grid-connected equipment status, grid-connected point voltage / current / active power / reactive power and power generation to the main station. Figure 1 In order to meet the technical requirements of distributed photovoltaic grid-connected systems, distributed photovoltaic grid-connected systems generally need to install station control layer data collectors, remote motors, longitudinal encryption devices, wireless communication devices, AGVC servers and other equipment. These devices are set up independently. Since each device has a specific function, there are many types of equipment in the distributed photovoltaic grid-connected system. However, the space for distributed photovoltaic grid-connected systems is very limited, and there is a problem of difficulty in on-site installation. In addition, too many devices will lead to a large workload for operation and maintenance and excessively high costs. Utility Model Content

[0003] In view of this, an embodiment of the utility model provides a distributed photovoltaic grid-connected system to provide a low-cost distributed photovoltaic grid-connected system.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A distributed photovoltaic grid-connected system, comprising:

[0006] Dispatching master station;

[0007] An all-in-one fusion gateway, the all-in-one fusion gateway comprises a wireless communication chip, a vertical encryption chip, a remote motor chip and a power / voltage control chip, the first end of the wireless communication chip is connected to the dispatching main station via a wireless network, the second end of the wireless communication chip is connected to the first end of the vertical encryption chip, the second end of the vertical encryption chip is connected to the first end of the remote motor chip, the second end of the remote motor chip and the power / voltage control chip are connected to the substation switch;

[0008] At least one substation switch.

[0009] Optionally, in the above-mentioned distributed photovoltaic grid-connected system, the all-in-one fusion gateway further includes:

[0010] A memory card is used to store historical data of the all-in-one fusion gateway.

[0011] Optionally, in the above-mentioned distributed photovoltaic grid-connected system, the all-in-one fusion gateway further includes:

[0012] At least one SIM card slot, the SIM card slot is adapted to accommodate a SIM card, and the SIM card is used to connect to a wireless network.

[0013] Optionally, in the above-mentioned distributed photovoltaic grid-connected system, the wireless communication chip has a first gain antenna interface and a second gain antenna interface, and the first gain antenna interface and the second gain antenna interface correspond to different network types.

[0014] Optionally, in the above-mentioned distributed photovoltaic grid-connected system, a debugging interface is provided on the shell of the all-in-one fusion gateway.

[0015] Optionally, in the above-mentioned distributed photovoltaic grid-connected system, the all-in-one fusion gateway further includes:

[0016] A power module, the power module is used to supply power to the electrical devices in the all-in-one converged gateway;

[0017] The power interface provided on the housing is used to connect to an external power source.

[0018] Optionally, in the above-mentioned distributed photovoltaic grid-connected system, the all-in-one fusion gateway adopts the RK3568 chip as the main control chip.

[0019] Optionally, in the above-mentioned distributed photovoltaic grid-connected system, the longitudinal encryption chip and the remote motor chip are integrated in the CPU of the RK3568 chip.

[0020] Optionally, in the above-mentioned distributed photovoltaic grid-connected system, the vertical encryption chip is a SC1161Y chip.

[0021] Optionally, in the above-mentioned distributed photovoltaic grid-connected system, the wireless communication chip is a 4G / 5G communication chip.

[0022] Based on the above technical scheme, the above scheme provided by the embodiment of the utility model integrates the wireless communication chip, the vertical encryption chip, the remote motor chip and the power / voltage control chip into the all-in-one fusion gateway, and reconstructs the original four devices into one device. There is no need to separately set up vertical encryption equipment, remote motors, and AGVC control modules in the distributed photovoltaic grid-connected system, which optimizes the installation space and reduces the cost of the distributed photovoltaic grid-connected system. Moreover, when connecting the distributed photovoltaic grid-connected system, there is no need to connect the wiring of each chip inside the all-in-one fusion gateway. The all-in-one fusion gateway can be connected to the distributed photovoltaic grid-connected system, and the wiring method is simple and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0024] Figure 1 It is a structural schematic diagram of a distributed photovoltaic grid-connected system in the prior art;

[0025] Figure 2 A schematic diagram of the structure of a distributed photovoltaic grid-connected system disclosed in an embodiment of the present application;

[0026] Figure 3 A schematic diagram of the structure of an all-in-one fusion gateway in a distributed photovoltaic grid-connected system disclosed in an embodiment of the present application;

[0027] Figure 4 This is a schematic diagram of the interface configuration of the all-in-one fusion gateway;

[0028] Figure 5 This is a schematic diagram of the structure of an all-in-one fusion gateway disclosed in another embodiment of the present application. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] The configuration of the distributed photovoltaic grid-connected system in the existing solution is shown in Table 1:

[0031]

[0032]

[0033] Table 1

[0034] The data flow in the existing distributed photovoltaic grid-connected system is as follows:

[0035] (1) The inverter, protection, measurement and control, and power quality monitoring devices communicate with the remote motor (station control layer acquisition device) through the serial port / network port using Modbus / 103 or 61850 to achieve full signal acquisition of data within the distributed photovoltaic station.

[0036] (2) The remote motor and the AGC system use 104 communication method to forward the inverter information to the AGC and receive the active power adjustment command issued by the AGC to realize the power tracking adjustment of the inverter.

[0037] (3) The remote machine is connected to the longitudinal encryption device via a network cable to achieve data encryption and decryption;

[0038] (4) The vertical encryption device is connected to the wireless routing device via a network cable, and the 4G / 5G wireless communication method is used through the wireless routing device to realize the main-substation message interaction and information transmission.

[0039] Taking a 10kV distributed photovoltaic grid-connected system as an example, the data points are shown in Tables 2 to 6:

[0040] telemetry:

[0041]

[0042]

[0043]

[0044] Table 2 Remote Signaling

[0045]

[0046]

[0047]

[0048] Table 3 Remote Control

[0049]

[0050]

[0051] Table 4 Remote Setting

[0052]

[0053]

[0054] Table 5

[0055] Electric energy information

[0056]

[0057] Table 6

[0058] Distributed photovoltaic grid-connected systems urgently need a low-cost, fully functional distributed photovoltaic grid-connected integrated device to solve the current dilemma. After research, the applicant found that distributed photovoltaic grid-connected systems are usually equipped with vertical encryption equipment, telemotors, AGC / AVC control modules, and the communication methods are usually wireless communication methods. These devices are independently set, which increases the construction cost of distributed photovoltaic grid-connected systems and the complexity of the construction process. With the continuous improvement of the main chip processing power, the rapid development of technologies such as industrial bus and data bus, embedded systems, etc., there are mature conditions for integrating the functions of multiple devices. This application integrates and develops a low-cost four-in-one fusion gateway device based on the industrial computer hardware platform. The fusion gateway device has data gateway machine (telemotor) and AGVC control functions; it integrates 4G / 5G communication modules and power micro-vertical encryption chips, and has 4G / 5G communication switching, identity two-way authentication, data encryption and access control functions, and fully realizes the distributed photovoltaic grid-connected system "observable, measurable, adjustable, and controllable", using information and digital technologies to solve problems related to grid absorption and grid-connected services. It can meet the needs of photovoltaic, power plants and distributed photovoltaic below 10 kV to access the main station system in a direct procurement manner and perform automatic power control and automatic voltage control. At the same time, the equipment has containerized app management function, which greatly facilitates the subsequent operation and maintenance and management, and meets the needs of distributed photovoltaic users for low-cost and fully functional devices.

[0059] See also Figure 2 and Figure 3 The distributed photovoltaic grid-connected system disclosed in the embodiment of the present application may include:

[0060] In this embodiment, an all-in-one fusion gateway 100, a switch 200 and a dispatching master station 300;

[0061] The all-in-one fusion gateway 100 integrates a wireless communication chip 101, a vertical encryption chip 102, a remote motor chip 103 and a power / voltage control chip 104;

[0062] The wireless communication chip 101 is connected to the remote motor chip 103 through the vertical encryption chip 102 , and the remote motor chip 103 and the power / voltage control chip 104 are connected to the switch 200 .

[0063] The remote motor chip 103 is used to realize the remote control function. Specifically, the remote motor chip 103 can collect the analog quantity and state quantity of the operating status of the equipment in the station (for example, the inverter) through the data collector in the switch, monitor and upload the collection results to the dispatching main station through the longitudinal encryption chip 102 and the wireless communication chip 101, and execute the control and adjustment commands sent by the dispatching main station 300 to the switch, and finally realize the "remote signal, telemetry, remote control, and remote adjustment" functions.

[0064] The power / voltage control chip 104 is used to realize the automatic power / voltage control function. Specifically, the power / voltage control chip 104 can receive and automatically execute the active and reactive power control signals sent remotely by the dispatching master station, and control the power output and voltage status of the station according to the optimal strategy to ensure that the operation of the station meets the requirements of the dispatching master station, and at the same time, transmit the system operation adjustment status, parameters and other information to the dispatching master station.

[0065] The vertical encryption chip 102 can be a power micro vertical encryption chip, which and the vertical encryption device at the dispatching main station use the SM2 encryption algorithm to establish an encryption tunnel, realize two-way identity authentication, data encryption and access control functions, and ensure data security.

[0066] The wireless communication chip 101 can have a built-in 4G / 5G communication module, set the SA independent networking mode, connect to the 4G / 5G power slice private network through a SIM card, and then connect to the dispatching master station security access area to achieve communication with the dispatching master station private network and interact with the dispatching master station for data.

[0067] The technical solution disclosed in the embodiment of the present application integrates the wireless communication chip, the vertical encryption chip, the remote motor chip and the power / voltage control chip into the all-in-one fusion gateway, and reconstructs the original four devices into a 1U whole-layer device. There is no need to separately set up vertical encryption equipment, remote motors, and AGVC control modules, thereby optimizing the installation space and reducing the cost of the distributed photovoltaic grid-connected system. Moreover, when connecting the distributed photovoltaic grid-connected system, there is no need to connect the wiring of each chip inside the all-in-one fusion gateway. The all-in-one fusion gateway can be connected to the distributed photovoltaic grid-connected system, and the wiring method is simple and fast.

[0068] In the technical solution disclosed in this embodiment, the hardware core board of the all-in-one fusion gateway can use the RK3568 chip, which adopts a quad-core ARM Cortex-A7 architecture or a quad-core 64-bit Cotx-A55 architecture, and the maximum main frequency supports 2.0GHz. It adopts design concepts such as fanless, high performance, low power consumption, and flexible installation. The operating system of the all-in-one fusion gateway can use the Linux+docker platform, and the factory provides basic images and packaged containers and other instruction sets to provide reliable support for the software applications loaded in the all-in-one fusion gateway.

[0069] In the technical solution disclosed in the embodiment of the present application, the all-in-one fusion gateway is configured with relevant interfaces and modules to realize the connection between the all-in-one fusion gateway and external devices. These interfaces and modules may include a power interface, a grounding bolt, a CONSOLE port, a USB interface, a B code, a LAN port, a DI port, a D0 port, a COM port, an expansion module, an antenna, an Ethernet port and a debugging port.

[0070] The power interface is used to connect the working power supply, and the working power supply is DC 110V / 125V / 220V (85V-265V) or AC 220V (85-265V), 50 / 60Hz. The transmission rate of the Ethernet port can be 10 / 100 / 1000Mbps. The debugging port is used to connect to a computer device via a network cable to debug the software of the all-in-one fusion gateway.

[0071] The hardware configuration of the all-in-one fusion gateway can be seen in Table 7.

[0072]

[0073]

[0074]

[0075] Table 7

[0076] Figure 4 The interface layout diagram of the all-in-one fusion gateway is shown in Table 7 and Figure 4 As shown, the all-in-one fusion gateway supports:

[0077] 4-way DI interface and 4-way DO interface. The DI interface and DO interface can realize the access of location nodes and the output of control commands. The device DI (DI often stands for "digital input". Digital input is usually used to read the status from a switch or other digital signal source, such as on / off status) meets two states (internal active, internal passive). The switching of the two states needs to be controlled by the jumper cap on the motherboard of the all-in-one fusion gateway. When the internal state is active, no external power supply is required, and the input wiring is DI- and GND. When the internal state is passive, the external input power supply range is 5-12V, and the input wiring is DI+ and DI-.

[0078] 2 RS232 serial ports, 4 RS485 serial ports and RS422 serial ports, the baud rate range of the serial ports is 300-38400bps, the baud rate defaults to 9600bps, 1 start bit, 8 data bits, no parity bit and 1 stop bit;

[0079] 4-channel analog input signal, supporting 4~20mA DC;

[0080] Built-in Ethernet port (RJ45), can connect to the intranet or the Internet;

[0081] Two USB ports for mouse and keyboard applications; two power supply modes: built-in battery and external power supply;

[0082] Encryption chip interface to realize data encryption function of application message;

[0083] 4G / 5G wireless interface, supports SIM cards, and supports SIM configuration for different types of networks to achieve 4G / 5G slicing communication requirements;

[0084] SD card interface: In order to meet the large-capacity storage requirements of the all-in-one fusion gateway, the all-in-one fusion gateway can also be configured with an SD memory card, which can be configured with 256M / 512M according to user requirements;

[0085] SATA interface, the SATA interface is used to access a storage hard disk.

[0086] As can be seen from the above, the rich interface design of the all-in-one fusion gateway enables the all-in-one gateway to meet various protocols to realize data collection and transmission of distributed photovoltaic grid-connected systems, and has the characteristics of simple maintenance.

[0087] In this solution, the all-in-one fusion gateway can adopt a core board plus baseboard design in hardware, which ensures the maintainability, stability and subsequent functional expansion of the all-in-one fusion gateway. Such a design not only shortens the R&D cycle, but also makes its structural hierarchy clearer. Secondly, the all-in-one fusion gateway can adopt an embedded Linux operating system at the system layer, and perform configuration compilation of the Linux kernel and deployment of the file system. The application software can adopt a modular design, and the fieldbus protocol can be converted into a Modbus-TCP protocol and forwarded through software applications, thus stably and reliably realizing the interconnection between Ethernet and industrial fieldbus equipment.

[0088] Figure 5 This is a schematic diagram of the specific structure of the all-in-one fusion gateway disclosed in this embodiment, see Figure 4 , the telecontrol chip and the power / voltage control chip are integrated on the CPU; at this time, the telecontrol chip and the power / voltage control chip can be integrated on the CPU by loading and running programs related to the telecontrol function and the power / voltage control function on the CPU, and the telecontrol and AGC / AVC data interaction is realized through shared memory; the vertical encryption chip can be implemented by SC1161Y, and the QSPI interface is used to realize data interaction between the vertical encryption chip and the CPU; the wireless communication chip uses a flat cable to realize data interaction with the CPU.

[0089] In the existing solution, the PRS-7910G data communication gateway serves as the communication hub of the distributed photovoltaic power station, connecting various intelligent acquisition and control devices and protection and measurement and control devices, coordinating the data and command interaction between each device and the monitoring end. Specifically, it connects the protection and measurement and control devices and various distributed photovoltaic intelligent acquisition devices to collect system analog quantity, switch quantity, and electricity quantity information; after protocol conversion, it is uploaded to the photovoltaic monitoring background and dispatching systems at all levels. At the same time, it receives control commands and adjustment instructions issued by the master station system, realizes the separation and closing of circuit breakers and the active power adjustment of inverters, and completes the information interaction between the control end and the interval layer equipment.

[0090] This application installs the Debian 10 operating system on the CPU of the all-in-one fusion gateway, then extracts the communication code of the PRS-7910G data communication gateway and adapts it to the CPU. Through the adaptation of the hardware driver and the modification of the software API interface, the driver can be quickly called, and each interface of the control system can realize the operation of the device file of the kernel driver. Each file can realize the operation of the underlying protocol and communication protocol program between users. On various high-level protocols of Ethernet, user-defined protocol programs based on Ethernet are run to realize shared memory. Through various memory user applications and interface function unified management mode applications, the remote motor function can be realized on the CPU of the all-in-one fusion gateway, and the CPU can be used as a remote motor chip.

[0091] In this embodiment, the original AGVC server can be optimized as an application program to run in the CPU, so as to realize the relevant functions of the original AGVC server through the CPU. The CPU can realize active power regulation and automatic voltage control. When working, the CPU obtains the relevant information of the new energy station and forwards it to the AGC / AVC master station, obtains and calculates the control strategy online based on the real-time operating conditions of the station, and automatically controls the active power generation units (wind turbines, photovoltaic inverters, energy storage, etc.) and reactive power regulation equipment of the new energy power plant in a closed loop, realizes automatic active power control and reasonable reactive voltage distribution, and maintains the power system frequency within the allowable error range.

[0092] In this embodiment, the wireless communication chip can be implemented using a 4G / 5G communication chip. The 4G / 5G communication chip can be set to an SA independent networking mode, and the 4G / 5G power slice private network can be connected by inserting a SIM card to realize the wireless communication function. The 4G / 5G communication chip and the CPU can be connected by a flat cable. The operating voltage of the 4G / 5G communication chip is 5 to 16V, and the maximum uplink rate can reach 512kbps. There are two external 5G signal gain antenna interfaces and two 4G signal gain antenna interfaces, which automatically reduce to 4G communication mode when the 5G signal is poor.

[0093] In the existing scheme, the vertical encryption authentication device provides a good monitoring function, which can monitor the status information of the device, the information of the tunnel, and the security policy information based on the tunnel. In this scheme, the security chip model SC1161Y can be selected as the vertical encryption chip. The SC1161Y chip is a 32-bit CPU chip that supports the SPI interface. It integrates 128KB code flash and 32KB data flash memory. It can be used as the unique identifier of the device, providing a secure hardware platform and important data storage functions; the four-in-one fusion gateway uses the built-in security chip to realize the encryption and decryption of the distributed photovoltaic power station, two-way identity authentication with the main station system, and integrity protection of the communication data, ensuring the security of the data storage, transmission, and interaction of the four-in-one fusion gateway device.

[0094] For the convenience of description, the above system is described by dividing the functions into various modules. Of course, when implementing the present invention, the functions of each module can be implemented in the same or multiple software and / or hardware.

[0095] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0096] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0097] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A distributed photovoltaic grid-connected system, characterized in that: include: Dispatching master station; An all-in-one fusion gateway, the all-in-one fusion gateway comprises a wireless communication chip, a vertical encryption chip, a telecontrol chip and a power / voltage control chip, the first end of the wireless communication chip is connected to the dispatching main station via a wireless network, the second end of the wireless communication chip is connected to the first end of the vertical encryption chip, the second end of the vertical encryption chip is connected to the first end of the telecontrol chip, the second end of the telecontrol chip and the power / voltage control chip are connected to a substation switch, the telecontrol chip and the power / voltage control chip are integrated on a CPU, and telecontrol and AGC / AVC data interaction is realized through a shared memory; the vertical encryption chip is realized by SC1161Y, and the vertical encryption chip and the CPU use a QSPI interface to realize data interaction; the wireless communication chip uses a flat cable to realize data interaction with the CPU; At least one substation switch.

2. The distributed photovoltaic grid-connected system according to claim 1, characterized in that: The all-in-one fusion gateway also includes: A memory card is used to store historical data of the all-in-one fusion gateway.

3. The distributed photovoltaic grid-connected system according to claim 1, characterized in that: The all-in-one fusion gateway also includes: At least one SIM card slot, the SIM card slot is adapted to accommodate a SIM card, and the SIM card is used to connect to a wireless network.

4. The distributed photovoltaic grid-connected system according to claim 1, characterized in that: The wireless communication chip has a first gain antenna interface and a second gain antenna interface, and the first gain antenna interface and the second gain antenna interface correspond to different network types.

5. The distributed photovoltaic grid-connected system according to claim 1, characterized in that: A debugging interface is provided on the shell of the all-in-one fusion gateway.

6. The distributed photovoltaic grid-connected system according to claim 1, characterized in that: The all-in-one fusion gateway also includes: A power module, the power module is used to supply power to the electrical devices in the all-in-one converged gateway; The power interface provided on the housing is used to connect to an external power source.

7. The distributed photovoltaic grid-connected system according to claim 1, characterized in that: The all-in-one fusion gateway uses the RK3568 chip as the main control chip.

8. The distributed photovoltaic grid-connected system according to claim 7, characterized in that: The vertical encryption chip and the remote control chip are integrated in the CPU of the RK3568 chip.

9. The distributed photovoltaic grid-connected system according to claim 1, characterized in that: The wireless communication chip is a 4G / 5G communication chip.

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