CN210488272U

CN210488272U - Local controller and microgrid

Info

Publication number: CN210488272U
Application number: CN201921604602.2U
Authority: CN
Inventors: 尹术军; 周晓峰
Original assignee: Shenzhen Tianshun Wisdom Energy Technology Co ltd
Current assignee: Shenzhen Tianshun Wisdom Energy Technology Co ltd
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2020-05-08
Anticipated expiration: 2029-09-25

Abstract

The utility model discloses a local controller, it includes: the device comprises a control unit, a CAN bus unit, an RS485 bus unit, a first communication unit and a second communication unit. The control unit is used for acquiring data of bottom layer equipment; the CAN bus unit and the RS485 bus unit are both connected with the control unit and are both used for transmitting data of the bottom layer equipment; the first communication unit is connected with the control unit and is used for carrying out network communication with the bottom layer equipment; and the second communication unit is connected with the control unit and is used for carrying out network communication with the local switch. The utility model discloses can enrich the interface type, functional module is more multiple, and each bottom equipment of compatible that can be fine reduces the local differentiation of each bottom equipment, can bring very big facility to product later maintenance and popularization simultaneously. The embodiment of the utility model provides a little electric wire netting is still provided, it includes an at least above-mentioned local controller.

Description

Local controller and microgrid

Technical Field

The utility model relates to a little electric wire netting field especially relates to a local controller and little electric wire netting.

Background

The high-speed development of modern communication, network, control and monitoring technologies enables the technologies to increasingly permeate into various technical fields, particularly under the large background condition that the problems faced by traditional energy sources are aggravated and new energy development is expected in recent years, the fusion of information technology and new energy development technology becomes a hotspot of research in the industry, but because the new energy has the characteristics of dispersed positions, being far away from the traditional large power grid dispatching area and being difficult to control in a centralized manner, the micro-grid for solving the problem that a new energy power grid runs reliably is produced.

The bottom layer equipment in the micro-grid system mainly comprises a distributed power generation device, an energy storage unit and a load. Because the interface types and data transmission speed requirements of data transmission of the bottom layer equipment are different, and different bottom layer equipment has different functional requirements, the local controllers of the bottom layer equipment have different functional requirements and designs, and cannot form a uniform structure. Therefore, the whole micro-grid system not only occupies a large amount of running space, but also increases the time and energy required for the early development and the later maintenance of the product, and the product has defects in compatibility.

SUMMERY OF THE UTILITY MODEL

The utility model provides a local controller and little electric wire netting aims at solving local controller compatibility among the correlation technique poor, and the reliability is low, maintains difficult technical problem.

The utility model provides a local controller, it includes: the control unit is used for acquiring data of the bottom layer equipment; the CAN bus unit is connected with the control unit and used for transmitting the data of the bottom layer equipment; the RS485 bus unit is connected with the control unit and used for transmitting the data of the bottom equipment; the first communication unit is connected with the control unit and is used for carrying out network communication with the bottom layer equipment; and the second communication unit is connected with the control unit and is used for carrying out network communication with a local switch.

Further, the CAN bus unit includes: the CAN controller is connected with the control unit and is used for processing the data sent by the control unit; and the CAN transceiver is connected with the CAN controller and used for realizing signal conversion so as to transmit and receive data on a CAN bus.

Further, the CAN transceiver adopts a TJA1052i chip.

Further, the RS485 bus unit includes: the RS485 controller is connected with the control unit and used for processing the data sent by the control unit; and the RS485 transceiver is connected with the RS485 controller and used for realizing signal conversion so as to receive and transmit data on the RS485 bus.

Further, the RS485 transceiver adopts an ADM2483 chip.

Further, the local controller further includes: and the DI/DO functional module is connected with the control unit and is used for carrying out threshold detection on the semaphore of the bottom layer equipment.

Further, the local controller further includes: and the AD sampling functional module is connected with the control unit and used for collecting the phase current and the phase voltage of the three-phase alternating current of the bottom layer equipment.

Further, the local controller further includes: and the WIFI functional module is connected with the control unit and used for realizing WIFI network communication.

Further, the control unit adopts an stm32F407zgtx chip.

The utility model also provides a little electric wire netting, it includes: the local controller is the local controller, and is connected with the bottom layer equipment.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a set up the data of CAN bus unit and RS485 bus unit transmission bottom equipment, set up first communication unit and carry out network communication with the bottom equipment, set up the second communication unit and carry out network communication with local switch, CAN enrich the interface type, functional module is more complete, each bottom equipment of compatible that CAN be fine, reduce the local differentiation of each bottom equipment, CAN bring very big facility to product later maintenance and popularization simultaneously.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.

Fig. 1 is a schematic circuit diagram of a local controller according to an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of a CAN bus unit of a local controller according to an embodiment of the present invention;

fig. 3 is a circuit diagram of a CAN bus unit of a local controller according to an embodiment of the present invention;

fig. 4 is a schematic circuit diagram of an RS485 bus unit of the local controller according to an embodiment of the present invention;

fig. 5 is a circuit diagram of an RS485 bus unit of the local controller according to an embodiment of the present invention;

fig. 6 is a schematic circuit diagram of a local controller according to another embodiment of the present invention;

FIG. 7 is a circuit diagram of a DI/DO functional block of a local controller according to an embodiment of the present invention;

fig. 8 is a circuit diagram of an AD sampling function module of the local controller according to an embodiment of the present invention;

fig. 9 is a circuit diagram of a WIFI function module of the local controller according to an embodiment of the present invention;

fig. 10 is a circuit diagram of a first communication unit of a local controller according to an embodiment of the present invention; and

fig. 11 is a circuit diagram of a second communication unit of the local controller according to an embodiment of the present invention;

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in the specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

Referring to fig. 1, an embodiment of a local controller 100 according to an embodiment of the present invention is shown. The utility model discloses use in little electric wire netting, little electric wire netting indicates the small-size power generation and distribution system of constituteing such as distributed power source, energy memory, energy conversion device, load, control and protection device. The local controller 100 is a controller in each sub-microgrid system, and is used for controlling and processing devices in the sub-microgrid, and is responsible for monitoring and controlling the sub-microgrid, so as to ensure safe and stable operation of the sub-microgrid.

The embodiment of the present invention provides a local controller 100 includes: a control unit 10, a CAN bus unit 20, an RS485 bus unit 30, a first communication unit 40, and a second communication unit 50. The control unit 10 is configured to obtain data of a bottom layer device; the CAN bus unit 20 is connected with the control unit 10 and used for transmitting data of the bottom layer equipment; the RS485 bus unit 30 is connected to the control unit 10, and is configured to transmit data of the bottom device; the first communication unit 40 is connected to the control unit 10, and is configured to perform network communication with the underlying device; the second communication unit 50 is connected to the control unit 10, and is configured to perform network communication with a local exchange. Through the design, the local controller 100 realizes communication with the bottom layer devices, can acquire the working state and the operating parameters of each bottom layer device, can receive the data instruction sent by the upper computer, and changes and sets the operating mode and the operating parameters of each bottom layer device.

Referring to fig. 2, in an embodiment, the CAN bus unit 20 includes: the CAN controller is connected with the control unit 10 and is used for processing data sent by the control unit 10; and the CAN transceiver is connected with the CAN controller and used for realizing signal conversion so as to transmit and receive data on a CAN bus. CAN (controller area network), i.e. a controller area network, is a serial communication network capable of realizing distributed real-time control, and CAN bus CAN realize free communication among nodes, so that the number of nodes in the network is not limited theoretically, and the network has simple structure, long transmission distance and high transmission rate. The CAN controller is used for realizing a protocol bottom layer and a data link layer of a CAN bus, generating a CAN frame and transmitting the CAN frame in a binary code stream mode, and performing operations such as bit filling, CRC (cyclic redundancy check) addition, response detection and the like in the process; and analyzing and receiving the received binary code stream, and performing transceiving comparison, bit removal filling, CRC (cyclic redundancy check) verification and other operations in the process. In addition, many tasks such as collision determination and error handling are required. The CAN transceiver is a physical layer of the CAN bus and is used for converting the binary code stream into differential signals to be transmitted and converting the differential signals into the binary code stream to be received. In the embodiment, as shown in fig. 3, a TJA1052i high-speed CAN transceiver is adopted to realize signal transmission and isolation between a CAN controller and a CAN bus, and a capacitive isolation technology is used to achieve an isolation level of 5 kV. Reliability and system performance parameters, such as cyclic delay, are improved through capacitive isolation techniques; enabling more reliable data communication transmission in noisy environments.

Referring to fig. 4, in one embodiment, the RS485 bus unit 30 includes: the RS485 controller is connected with the control unit 10 and used for processing data sent by the control unit 10; and the RS485 transceiver is connected with the RS485 controller and used for realizing signal conversion so as to receive and transmit data on the RS485 bus. RS485 adopts half-duplex working mode, supports multiple spot data communication, because RS485 standard only makes the regulation to the electric characteristic of interface, does not relate to connector cable or agreement, user can establish own high-level communication protocol on this basis, and the commonality is high. In this embodiment, as shown in fig. 5, an ADM2483 chip is used, which is an enhanced RS485 transceiver with isolation, and a slew rate limiting driver is used, so that a lower slew rate reduces errors generated by improper terminal matching and connectors, and meanwhile, short-circuit current limitation is provided, and the driver output can be set to a high-impedance state through a thermal shutdown protection circuit, thereby preventing excessive power loss.

In one embodiment, the control unit 10 employs a stm32F407zgtx chip.

Referring to fig. 6, in an embodiment, the local controller 100 further includes: a DI/DO function module 60, wherein the DI/DO function module 60 is connected with the control unit 10 and is used for carrying out threshold detection on the semaphore of the bottom layer equipment. In this embodiment, as shown in fig. 7, the input and output signals of the DI/DO functional module 60 all pass through the optical coupling isolation chip ACPL-247 to reduce external interference. In addition, in order to improve the current driving capability and the load carrying capability, the output signal is connected to the Lington transistor array ULN2003ADR so that the output signal can directly drive a relay and also can directly drive a low-voltage line.

Referring to fig. 6, in an embodiment, the local controller 100 further includes: and the AD sampling functional module 70 is connected with the control unit 10, and is used for collecting phase currents and phase voltages of three-phase alternating currents of the bottom layer equipment. In this embodiment, as shown in fig. 8, the TVs 1005 and the TAs 1005 in the figure are an ac voltage transformer and an ac current transformer, respectively, which convert phase voltages and phase currents into corresponding ac voltages according to a certain proportion, and then convert ac voltage signals into digital signals through the electricity meter chip MCP3913a1, so as to implement real-time monitoring on three-phase ac power.

Referring to fig. 6, in an embodiment, the local controller 100 further includes: and the WIFI functional module 80 is connected with the control unit 10 and used for realizing WIFI network communication. In this embodiment, as shown in fig. 9, an ESP8266-07 module is adopted, and configured in the circuit in an STA mode, and the main function is to convert the serial port level to conform to the WIFI wireless network communication standard, and add the local controller 100 to an existing network for communication transmission.

Referring to fig. 10 and 11, in an embodiment, as shown in fig. 10, the first communication unit 40 is a MAC ethernet controller embedded in the control unit 10, and the external physical layer chip select LAN8720A supports communication with the ethernet MAC layer through the RMII interface, so that the number of signal pins can be reduced, which is beneficial to simplifying the design. The first communication unit 40 is used to implement communication connection with the underlying device. In this embodiment, as shown in fig. 11, the second communication unit 50 uses an EPI interface of the control unit 10, and uses a DM9000CI chip as an external chip, which is an integrated chip capable of implementing functions of an ethernet MAC layer and a PHY layer, and the control unit 10 uses an FSMC 16-bit address data multiplexing mode to implement data transmission with the DM9000 CI. The second communication unit 50 is in communication connection with the local exchange, so that communication with the upper layer networking is realized.

The embodiment of the utility model provides a local controller 100 has been demonstrated, through the data that set up CAN bus unit 20 and RS485 bus unit 30 transmission bottom equipment, set up first communication unit 40 and carry out network communication with bottom equipment, set up second communication unit 50 and carry out network communication with local switch, CAN enrich the interface type, functional module is more complete, each bottom equipment of compatible that CAN be fine, reduce the local differentiation of each bottom equipment, CAN bring very big facility to product later maintenance and popularization simultaneously.

The utility model discloses another embodiment still provides a microgrid, microgrid includes an at least local controller 100, local controller 100 be in above-mentioned embodiment local controller 100, local controller 100 is connected with bottom equipment to acquire each bottom equipment data, solved the local differentiation of each bottom equipment, have two way network communication interfaces simultaneously, can realize going upward and descending of local controller 100 data, and have AD sampling function module 70 and DI/DO function module 60 and WIFI module, satisfy the extra functional requirement of individuality bottom equipment.

The utility model discloses a micro-grid, it is through setting up the data that CAN bus unit 20 and RS485 bus unit 30 transmitted the bottom equipment, set up first communication unit 40 and carry out network communication with the bottom equipment, set up second communication unit 50 and carry out network communication with local switch, CAN enrich the interface type, functional module is more complete, each bottom equipment of compatible that CAN be fine, reduce the local differentiation of each bottom equipment, CAN bring very big facility to product later maintenance and popularization simultaneously.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A local controller, comprising:

the control unit is used for acquiring data of the bottom layer equipment;

the CAN bus unit is connected with the control unit and used for transmitting the data of the bottom layer equipment;

the RS485 bus unit is connected with the control unit and used for transmitting the data of the bottom equipment;

the first communication unit is connected with the control unit and is used for carrying out network communication with the bottom layer equipment;

and the second communication unit is connected with the control unit and is used for carrying out network communication with a local switch.

2. The local controller of claim 1, wherein the CAN bus unit comprises:

the CAN controller is connected with the control unit and is used for processing the data sent by the control unit;

and the CAN transceiver is connected with the CAN controller and used for realizing signal conversion so as to transmit and receive data on a CAN bus.

3. The local controller of claim 2, wherein the CAN transceiver employs a TJA1052i chip.

4. The local controller of claim 1, wherein the RS485 bus unit comprises:

the RS485 controller is connected with the control unit and used for processing the data sent by the control unit;

and the RS485 transceiver is connected with the RS485 controller and used for realizing signal conversion so as to receive and transmit data on the RS485 bus.

5. The local controller of claim 1, wherein the RS485 transceiver employs an ADM2483 chip.

6. The local controller of claim 1, further comprising:

and the DI/DO functional module is connected with the control unit and is used for carrying out threshold detection on the semaphore of the bottom layer equipment.

7. The local controller of claim 1, further comprising:

and the AD sampling functional module is connected with the control unit and used for collecting the phase current and the phase voltage of the three-phase alternating current of the bottom layer equipment.

8. The local controller of claim 1, further comprising:

and the WIFI functional module is connected with the control unit and used for realizing WIFI network communication.

9. The local controller according to any of claims 1-8, wherein said control unit employs stm32F407zgtx chips.

10. A microgrid, comprising: at least one local controller according to any one of claims 1 to 9, the local controller being connected to the underlying device.