CN108649898A - Header box acquisition based on NBIOT and emitter - Google Patents

Abstract

The invention discloses a collection and emission device for a combiner box based on NBIOT, which includes a photovoltaic string and a combiner box. A collection and emission device is arranged between the photovoltaic string and the combiner box. The collection and emission device includes a box body , the inside of the box is equipped with a photovoltaic confluence collector and a collection and emission module. The positive or negative poles of the photovoltaic strings are respectively connected to the photovoltaic confluence collector; the DC voltage input port and the auxiliary power input port of the photovoltaic confluence collector are respectively It is electrically connected with the bus bar of the combiner box; there are four power supply modes for the collection and transmission module; the collection and transmission module includes a core processor, a power supply management unit, a network processing unit, an information collection communication interface unit, and an information display and storage unit; The modules are connected to different cloud server platforms through wireless signals. The invention reduces the transformation, construction and maintenance costs of common combiner boxes in early photovoltaic power stations, and avoids the waste of original combiner boxes.

Description

Combiner Box Acquisition and Transmission Device Based on NBIOT

technical field

The invention relates to the technical field of detection, in particular to an NBIOT-based combiner box acquisition and emission device.

Background technique

Narrow Band Internet of Things (NB-IoT) has become an important branch of the Internet of Things; based on NB-IoT, it is built on a cellular network and only consumes about 180KHz of bandwidth. UMTS network or LTE network to reduce deployment costs and achieve smooth and stable upgrades; NB-IoT is an emerging technology in the IoT field that supports cellular data connections of low-power devices in wide area networks, also known as low-power wide area networks (LPWAN) ; NB-IoT supports long standby time, low power consumption, and high-efficiency connection of devices with high network connection requirements; it is said that the battery life of NB-IoT devices can be increased to at least 10 years, and it can also provide very comprehensive indoor cellular data connection coverage , especially suitable for IoT fields such as smart cities, smart agriculture, distributed photovoltaics, and environmental monitoring.

In recent years, China's photovoltaic power generation has developed rapidly, and the scale of photovoltaic installed capacity has expanded year by year. In order to reduce the connection between photovoltaic modules and inverters and increase installed capacity in large-scale photovoltaic grid-connected power generation systems, it is generally necessary to increase ordinary photovoltaic confluence between photovoltaic modules and inverters. According to the DC voltage range input by the inverter, a certain number of photovoltaic modules with the same specifications are connected in series to form a photovoltaic string, and then several photovoltaic strings are connected to the photovoltaic combiner box for confluence. and the output of the circuit breaker, and finally connected to the input of the inverter; although the use of this common combiner box greatly reduces the cost of photovoltaic power plant construction, there are great defects in the maintenance of the power plant system: lack of acquisition devices, and real-time monitoring The voltage and current of each photovoltaic string cannot be transmitted to the cloud server platform in real time.

At present, there are many kinds of smart photovoltaic combiner boxes on the market. This kind of smart combiner box integrates ordinary combiner boxes and acquisition modules, which greatly improves the reliability of photovoltaic power plants and makes up for the defects of ordinary combiner boxes, but the price is relatively expensive; For the photovoltaic power plants built in the early stage, the combiner boxes used are ordinary combiner boxes. In order to improve the maintainability of the power plant, all ordinary combiner boxes are replaced with smart photovoltaic combiner boxes, which will further increase the investment cost and maintenance cost. Also must cause the waste of original common combiner box. In order to solve the above problems, the present invention provides an NBIOT-based combiner box acquisition and emission device, which can not only transmit the collected voltage and current signals to the cloud server platform in real time, but also greatly reduce the cost of early photovoltaic power plants. The transformation cost, construction cost, and maintenance cost of ordinary combiner boxes avoid the waste of original combiner boxes.

Contents of the invention

Aiming at the deficiencies and defects of the existing technology, the present invention provides an NBIOT-based combiner box acquisition and emission device, which greatly reduces the transformation, construction and maintenance costs of the common combiner box in the early photovoltaic power station, and avoids the original confluence box waste.

For realizing described object, the technical scheme that the present invention adopts is:

A collection and emission device for a combiner box based on NBIOT, including a photovoltaic string and a combiner box, a collection and emission device is arranged between the photovoltaic string and the combiner box, the collection and emission device includes a box body, and the box A photovoltaic confluence collector and a collection and emission module are arranged inside the body, the photovoltaic confluence collector is provided with perforations, and the positive or negative pole lines of the photovoltaic strings pass through the perforations to connect with the photovoltaic confluence collector; the photovoltaic confluence collector The DC voltage input port and the auxiliary power input port are respectively electrically connected to the bus bar of the combiner box;

There are four power supply modes for the collection and transmission module;

The collection and transmission module includes a core processor, a power supply management unit, a network processing unit, an information collection communication interface unit, and an information display and storage unit; the collection and transmission module is connected to different cloud server platforms through wireless signals;

The photovoltaic confluence collector is used to collect the current of the photovoltaic string and the bus voltage of the combiner box, and transmit the collected current or voltage data to the core processor.

Further, the power supply management unit is used to obtain and identify the power supply mode of the acquisition and transmission module.

Further, the information collection communication interface unit includes a wireless communication port and a wired communication port, and the wired communication port adopts RS485 bus, I ² C bus or SPI bus to connect with the photovoltaic collector; the wireless communication port adopts Zigbee wireless The transceiver module, 433 wireless transceiver module or LoRa wireless transceiver module are connected to the photovoltaic confluence collector;

The information collection communication interface unit is used for wired or wireless communication with the photovoltaic confluence collector through different communication ports.

Further, the core processor is used to receive the collected current or voltage data, analyze and process it, encode and store it, and wirelessly transmit the processed data; at the same time, acquire information about the power supply mode, analyze and store it ;

The core processor adopts STM series single-chip microcomputer, PIC series single-chip microcomputer or ARM processor.

Further, the information display and storage unit includes a digital circuit and an encoder, and the digital circuit is electrically connected to the encoder;

The information display and storage unit is used for information interaction with the core processor to complete data display and storage.

Further, the network processing unit includes a plurality of selectors and a plurality of communication modules, one end of the selector is connected to the core processor, and the other end of the selector is connected to the communication modules in a one-to-one correspondence;

Described communication module comprises 2G, 3G, 4G communication module, LoRa wireless communication module and NB-IOT wireless communication module;

The network processing unit is used to select the corresponding communication module according to the communication protocol and mode, and perform data and command interaction with the cloud server platform.

Further, the selector includes a jumper cap and an executable control device, the executable control device is a MOS tube or an optocoupler; the LoRa wireless communication module uses a wireless communication network in the 433MHZ frequency band.

Further, the collection and transmission module also includes an NBIOT antenna, and the NBIOT antenna is arranged outside or inside the box;

The NBIOT antenna is used to send and receive data communicated through the NB-IOT wireless communication module.

Further, the power supply mode of the acquisition and transmission module includes the bus voltage power supply of the combiner box, photovoltaic panel power supply, mains AC220V power supply and 6~36V DC battery power supply.

The beneficial effects of the present invention are:

The present invention is an NBIOT-based combiner box acquisition and emission device. The device is located at the front end of an ordinary combiner box. The current to the photovoltaic string and the voltage signal of the combiner box are transmitted to the cloud server platform over a long distance, and can greatly reduce the transformation cost, construction cost, and maintenance cost of the ordinary combiner box in the early photovoltaic power station, without causing waste of the original combiner box; At the same time, the current signals of multiple photovoltaic strings are collected, and the collected voltage and current signals are transmitted to the smart terminal at a long distance, which greatly improves the reliability and maintainability of the power station system; for early photovoltaic power stations, the device can be directly used It can be put into use after being placed at the front of a common combiner box, which reduces the maintenance and troubleshooting costs of the power station and avoids the waste of the original common combiner box.

Description of drawings

Fig. 1 is a schematic structural diagram of the NBIOT-based combiner box acquisition and emission device of the present invention.

Fig. 2 is a structural diagram of the network processing unit of the present invention.

The numbers in the drawings are: 1 is the cabinet, 2 is the collection and transmission module, 3 is the photovoltaic confluence collector, 4 is the cloud server platform, 201 is the core processor, 202 is the network processing unit, 203 is the power supply management unit, 204 is an information display and storage unit, 205 is an information collection communication interface unit, and 206 is an NBIOT antenna.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

As shown in Figures 1 to 2, an NBIOT-based combiner box acquisition and emission device includes a photovoltaic string and a combiner box. A collection and emission device is arranged between the photovoltaic string and the combiner box. The acquisition and The emission device includes a box body 1, and the inside of the box body 1 is equipped with a photovoltaic confluence collector 3 and a collection and emission module 2. The photovoltaic confluence collector 3 is provided with perforations, and the positive or negative pole lines of the photovoltaic strings are respectively through the perforation and connected to the photovoltaic confluence collector 3; the DC voltage input port and the auxiliary power input port of the photovoltaic confluence collector 3 are respectively electrically connected to the bus bar of the combiner box;

There are four power supply modes for the collection and transmission module 2; the collection and transmission module 2 includes a core processor 201, a power supply management unit 203, a network processing unit 202, an information collection communication interface unit 205 and an information display and storage unit 204 The collection and transmission module 2 is connected to different cloud server platforms 4 through wireless signals; the photovoltaic confluence collector 3 is used to collect the current of the photovoltaic string and the bus voltage of the combiner box, and collect the collected current or The voltage data is transmitted to the core processor 201 .

The power supply management unit 203 is used to obtain and identify the power supply mode of the acquisition and transmission module 2 . The information collection communication interface unit 205 includes a wireless communication port and a wired communication port, and the wired communication port adopts RS485 bus, I ² C bus or SPI bus to connect with the photovoltaic collector 3; the wireless communication port adopts Zigbee wireless transceiver The module, the 433 wireless transceiver module or the LoRa wireless transceiver module are connected to the photovoltaic confluence collector 3 .

The information collection communication interface unit 205 is used for wired or wireless communication with the photovoltaic collector 3 through different communication ports.

The core processor 201 is used to receive the collected current or voltage data, analyze and process it, encode and store it, and wirelessly transmit the processed data; at the same time, acquire information about the power supply mode, analyze and store it; The core processor 201 adopts STM series single-chip microcomputer, PIC series single-chip microcomputer or ARM processor.

The information display and storage unit 204 includes a digital circuit and an encoder, and the digital circuit is electrically connected to the encoder; the information display and storage unit 204 is used for information interaction with the core processor 201 to complete data display and storage.

It is worth noting that: the information display in the information display and storage unit 204 can be displayed by an integrated module, such as LCD or LED screen; the storage in the information display and storage unit 204 adopts a memory chip, memory card or U disk You can wait.

The network processing unit 202 includes a plurality of selectors and a plurality of communication modules, one end of the selector is connected to the core processor 201, and the other end of the selector is connected to the communication modules one by one; the communication module includes 2G, 3G, 4G communication module, LoRa wireless communication module and NB-IOT wireless communication module; The network processing unit 202 is used to select the corresponding communication module according to the communication protocol and mode, and interact with the cloud server platform 4 for data and instructions .

It is worth noting that: the cloud server platform 4 can construct a cloud platform by building a server by itself, or rent a cloud server platform such as Alibaba Cloud, Huawei Cloud or Tencent Cloud, or use a public cloud server platform, such as ONENET platform or WeChat platform Wait.

The selector includes a jumper cap and an executable control device, the executable control device is a MOS tube or an optical coupler; the LoRa wireless communication module adopts a wireless communication network in the 433MHZ frequency band; the acquisition and transmission module 2 also includes NBIOT antenna 206, the NBIOT antenna 206 is arranged outside or inside the box 1; the NBIOT antenna 206 is used to send and receive data communicated through the NB-IOT wireless communication module.

The power supply mode of the acquisition and transmission module 2 includes the bus voltage power supply of the combiner box, the photovoltaic panel power supply, the mains AC220V power supply and the 6~36V DC battery power supply.

It is worth noting that the power supply voltage of the acquisition and transmission module 2 is DC 6~36V. When the bus voltage of the combiner box is used for power supply, the DC/DC circuit built in the photovoltaic collector 3 is converted into the required 6~36V Power supply voltage; when using photovoltaic panel power supply or mains AC220V power supply, an external AC-DC converter is required, and then converted to the required 6~36V power supply voltage through the built-in DC/DC circuit of photovoltaic confluence collector 3; when 6~ When powered by a 36V DC battery, a lithium battery or storage battery can be used to directly supply power to the photovoltaic confluence collector 3 .

As a possible implementation, the core processor 201 adopts an STM32F7x2 single-chip microcomputer.

As a possible implementation mode, the photovoltaic confluence collector 3 adopts the AGF series rail-type intelligent photovoltaic confluence collector produced by Ankerui Electric Company. 32-way and 32-way; in this embodiment, the perforation arranged by the photovoltaic confluence collector 3 is 24-way perforation.

An operation process of an NBIOT-based combiner box acquisition and transmission device is as follows: first, the device is powered on, and the core processor 201 and each unit complete initialization inspection;

The core processor 201 judges the power supply mode of the device by obtaining the initialization results of the hardware circuits of each unit. In this embodiment, the bus voltage of the combiner box is selected to supply power to the device, which is converted into the required DC6-DC by the built-in DC/DC conversion circuit. 36V voltage;

Secondly, the photovoltaic confluence collector 3 collects the current of the photovoltaic string and the bus voltage of the combiner box, the information collection communication interface unit 205 selects the communication mode of different acquisition modules, and the collected current and voltage data are transmitted to the core processing through the corresponding communication mode device 201;

The core processor 201 analyzes and processes the current or voltage data after receiving it, and at the same time displays and stores the data through the information display and storage unit 204;

The core processor 201 sends the data to the network processing unit 202;

The selector of the network processing unit 202 selects the corresponding communication module, and transmits the data to the cloud server platform 4 through wireless signals.

It is worth noting that the communication module of the network processing unit 202 in this embodiment selects the NB-IOT wireless communication module; the NB-IOT wireless communication module performs data communication with the cloud server platform 4 through the NBIOT antenna 206 according to the prescribed communication protocol and method. command interaction.

The present invention is located at the front end of a common combiner box. Several photovoltaic strings pass through the photovoltaic confluence collector 3, and then connect to the common combiner box for confluence. Not only can the collected voltage and current signals be remotely transmitted to the cloud server platform in real time 4. Through the low-power NBIOT wireless networking, the transformation and construction costs of the early photovoltaic power station combiner boxes are greatly reduced.

It should be noted that the above-described embodiments are only preferred embodiments of the present invention, and do not limit the scope of the present invention, so all equivalent changes made according to the structure, features and principles described in the patent scope of the present invention Or modifications, should be included in the patent scope of the present invention.

Claims (9)

1. a kind of header box acquisition and emitter based on NBIOT, including photovoltaic string formation and header box, the photovoltaic string formation and Acquisition and emitter are laid between header box, which is characterized in that described acquire with emitter includes babinet（1）, described Babinet（1）Inside is laid with photovoltaic conflux collector（3）With acquisition and transmitting module（2）, the photovoltaic conflux collector（3）If There are perforation, the electrode line or negative line of the photovoltaic string formation to be each passed through perforation and photovoltaic conflux collector（3）Connection；Photovoltaic converges Flow collector（3）DC voltage input end mouth and accessory power supply input port be electrically connected respectively with header box busbar；

The acquisition and transmitting module（2）Power supply mode there are four types of；

The acquisition and transmitting module（2）Including core processor（201）, power management unit（203）, network processing unit （202）, information collection communications interface unit（205）With presentation of information and storage unit（204）；The acquisition and transmitting module （2）Different Cloud Server platforms is connected to by wireless signal（4）；

The photovoltaic conflux collector（3）, the busbar voltage of electric current and header box for acquiring photovoltaic string formation, and will collect Current or voltage data transmission to core processor（201）.

2. header box acquisition and emitter according to claim 1 based on NBIOT, which is characterized in that the power supply Administrative unit（203）, for obtaining and identifying acquisition and transmitting module（2）Power supply mode.

3. header box acquisition and emitter according to claim 1 based on NBIOT, which is characterized in that described information Acquire communications interface unit（205）Including wireless communication port and wire communication port, the wire communication port uses RS485 Bus, I²C buses or spi bus and photovoltaic conflux collector（3）Connection；The wireless communication port is wirelessly received using Zigbee Send out module, 433 radio receiving transmitting modules or LoRa radio receiving transmitting modules and photovoltaic conflux collector（3）Connection；

Described information acquires communications interface unit（205）, for using different PORT COMs and photovoltaic conflux collector（3）Into Row wired or wireless communication.

4. header box acquisition and emitter according to claim 1 based on NBIOT, which is characterized in that the core Processor（201）, the current or voltage data for collecting, analyze it processing after code storage, and will place Data after reason are wirelessly transferred；The information of power supply mode is obtained simultaneously, and carries out analysis storage；

The core processor（201）Using STM series monolithics, PIC series monolithics or arm processor.

5. header box acquisition and emitter according to claim 1 based on NBIOT, which is characterized in that described information Display and storage unit（204）Including digital circuit and encoder, the digital circuit is electrically connected with encoder；

Described information is shown and storage unit（204）, it is used for and core processor（201）Information exchange is carried out, data are completed Display and storage.

6. header box acquisition and emitter according to claim 1 based on NBIOT, which is characterized in that the network Processing unit（202）Including multiple selectors and multiple communication modules, one end of the selector is all connected with core processor （201）, the other end and the communication module of selector connect one to one；

The communication module includes 2G, 3G, 4G communication module, LoRa wireless communication modules and NB-IOT wireless communication modules；

The network processing unit（202）, for according to communication protocol and mode, corresponding communication module being selected, with cloud service Device platform（4）Carry out the interaction of data and instruction.

7. header box acquisition and emitter according to claim 6 based on NBIOT, which is characterized in that the selection Device includes jump cap and executable control device, and the executable control device is metal-oxide-semiconductor or photo-coupler；The LoRa channel radios Believe that module uses the cordless communication network of 433MHZ frequency ranges.

8. header box acquisition and emitter according to claim 6 based on NBIOT, which is characterized in that the acquisition With transmitting module（2）Further include NBIOT antennas（206）, the NBIOT antennas（206）It is laid in babinet（1）Outside or interior Portion；

The NBIOT antennas（206）, for receiving and dispatching the data communicated by NB-IOT wireless communication modules.

9. header box acquisition and emitter according to claim 1 based on NBIOT, which is characterized in that the acquisition With transmitting module（2）Power supply mode include the busbar voltage power supply of header box, photovoltaic panel power supply, alternating current AC220V power supply and 6 ~ 36V dc-batteries are powered.