阅读说明：本技术 一种通讯采集装置、光伏逆变器及控制系统 (Communication collection system, photovoltaic inverter and control system ) 是由 彭宏亮 于 2020-05-26 设计创作，主要内容包括：一种通讯采集装置、光伏逆变器及控制系统,通讯采集装置包括：第一通讯模块,用于接收组件控制端传输的输出电压和向组件控制端发送组件通断信号；第二通讯模块,用于接收监测端发送的组串通断信号和向监测端传输回路电流、输出电压；微控器,用于接收逆变器本体采集的回路电流；微控器还分别与第一通讯模块、第二通讯模块连接,用于通过第一通讯模块接收输出电压和向组件控制端发送组件通断信号,通过第二通讯模块接收监测端传输的组串通断信号和向监测端传输回路电流、输出电压。本发明实施例在实现了对光伏组件状态进行远程监测的同时,还具备了远程对光伏组件进行关断的能力,不仅将两大功能进行了融合,还大幅降低了监控的成本。(The utility model provides a communication collection system, photovoltaic inverter and control system, communication collection system includes: the first communication module is used for receiving the output voltage transmitted by the component control end and sending a component on-off signal to the component control end; the second communication module is used for receiving the on-off signal of the string sent by the monitoring end, transmitting loop current to the monitoring end and outputting voltage; the microcontroller is used for receiving the loop current collected by the inverter body; the micro controller is also connected with the first communication module and the second communication module respectively and used for receiving the output voltage through the first communication module and sending a component on-off signal to the component control end, and receiving the group string on-off signal transmitted by the monitoring end through the second communication module and transmitting loop current and output voltage to the monitoring end. The embodiment of the invention realizes the remote monitoring of the state of the photovoltaic module, and simultaneously has the capability of remotely switching off the photovoltaic module, thereby not only fusing the two functions, but also greatly reducing the monitoring cost.)

1. A communication acquisition device, comprising:

the first communication module (100) is used for connecting a component control end (400) of the photovoltaic component; the component control end (400) is used for collecting output voltage of a photovoltaic component, outputting the output voltage to the first communication module (100), and controlling the on-off of the photovoltaic component according to a component on-off signal output by the first communication module (100);

the second communication module (200) is used for receiving the group string on-off signal sent by the monitoring end (500) and transmitting loop current and the output voltage to the monitoring end (500);

the microcontroller (300) is connected with the inverter body (600) and is used for receiving the loop current collected by the inverter body (600); the micro controller (300) is further connected with the first communication module (100) and the second communication module (200) respectively, and is used for receiving the output voltage through the first communication module (100) and sending the component on-off signal to the component control end (400), and is also used for receiving the group string on-off signal transmitted by the monitoring end (500) through the second communication module (200) and transmitting the loop current and the output voltage to the monitoring end (500).

2. The communication collection device of claim 1, wherein the first communication module (100) and/or the second communication module (200) is a wireless communication module.

3. The communication acquisition device of claim 2, wherein the wireless communication module is a WIFI module, a Bluetooth module or a ZigBee module.

4. The communication acquisition device according to claim 1, characterized in that said second communication module (200) is a GSM/GPRS module.

5. The communication collection device of claim 1, wherein the first communication module (100) is a powerline carrier communication module.

6. The communication acquisition device according to claim 1, characterized in that said microcontroller (300) employs a processor with an internal temperature sensor.

7. The communication collection device according to claim 1, further comprising a temperature collection unit connected to the microcontroller (300), the temperature collection unit being configured to collect a temperature of the inverter body (600).

8. A photovoltaic inverter, characterized by comprising an inverter body (600) and a communication acquisition device according to any one of claims 1 to 7 connected to the inverter body (600).

9. A photovoltaic module control system, comprising:

the photovoltaic inverter of claim 8;

the component control end (400) is connected with the photovoltaic inverter, is used for collecting the output voltage of the photovoltaic component and transmitting the output voltage to the photovoltaic inverter, and is also used for receiving the component on-off signal sent by the photovoltaic inverter to control the on-off of the photovoltaic component;

and the monitoring end (500) is connected with the photovoltaic inverter and used for sending the string on-off signal to the photovoltaic inverter and receiving the output voltage and the loop current sent by the photovoltaic inverter.

Technical Field

The invention belongs to the field of photovoltaic power generation, and particularly relates to a communication acquisition device, a photovoltaic inverter and a control system.

Background

With the development and maturity of photovoltaic power generation technology, photovoltaic power generation has become one of important components in the field of new energy.

At present, in the photovoltaic industry, photovoltaic inverters produced by mainstream photovoltaic inverter manufacturers belong to a group string inverter. The group string type inverters can only realize group string level monitoring, but cannot realize monitoring of the level where the photovoltaic module is located. The group string type inverters can only monitor the voltage and the current of the photovoltaic group string, and meanwhile, the group string type inverters cannot communicate with a component control end of a first level where the photovoltaic component is located, so that the existing inverter technology can only realize group string level monitoring, but cannot realize component level monitoring, and further cannot realize control over bottom-layer equipment where the photovoltaic component is located.

The term of art: a photovoltaic module: a power generation device for converting solar energy into direct current, also called a solar cell panel. Photovoltaic string: in a photovoltaic power generation system, a circuit unit is formed by connecting several photovoltaic modules or even dozens of photovoltaic modules in series. Direct current high voltage: in a photovoltaic power generation system formed by connecting several or even dozens of photovoltaic modules in series, a direct current high voltage of 500V to 1500V exists. Photovoltaic inverter: and the equipment is used for converting the direct current generated by the photovoltaic module into alternating current to be output.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a communication acquisition device which is simple in structure and solves the problem that a photovoltaic inverter cannot carry out photovoltaic module level monitoring. The invention further provides a photovoltaic inverter and a photovoltaic module control system.

According to the embodiment of the first aspect of the invention, the communication acquisition device comprises: the first communication module is used for connecting a component control end of the photovoltaic component; the component control end is used for collecting the output voltage of the photovoltaic component, outputting the output voltage to the first communication module, and controlling the on-off of the photovoltaic component according to a component on-off signal output by the first communication module; the second communication module is used for receiving a group string on-off signal sent by a monitoring end and transmitting loop current and the output voltage to the monitoring end; the microcontroller is connected with the inverter body connected with the photovoltaic set in series and used for receiving the loop current collected by the inverter body; the micro controller is also connected with the first communication module and the second communication module respectively, and is used for receiving the output voltage through the first communication module and sending the component on-off signal to the component control end, and is also used for receiving the string on-off signal transmitted by the monitoring end through the second communication module and transmitting the loop current and the output voltage to the monitoring end.

The communication acquisition device provided by the embodiment of the invention at least has the following technical effects: the communication with the component control end at the bottom layer is realized through the first communication module, and the voltage data of the photovoltaic component collected by the component control end can be received and uploaded to the monitoring end through the second communication module, so that the photovoltaic component level monitoring is realized; meanwhile, the microcontroller can send a component on-off signal to the component control end through the first communication module, and the component control end is controlled to turn off a component turn-off switch connected with the photovoltaic component, so that photovoltaic component-level turn-off control is realized. The microcontroller can acquire the loop current of the photovoltaic string acquired by the inverter body through communication with the inverter body, and then skillfully utilizes the characteristic that the loop current is equal to acquire the current of a photovoltaic assembly in the photovoltaic string, so that the repeated arrangement of current sensors in a photovoltaic power generation field can be effectively reduced, and the cost is greatly reduced. In addition, the microcontroller can control the inverter body to switch off the current switch of the inverter body, so that the loop of the photovoltaic string is disconnected, and the control end of the component can not face the impact of large current any more when the switch of the component is switched off subsequently.

According to some embodiments of the present invention, the first communication module and/or the second communication module employs a wireless communication module.

According to some embodiments of the invention, the wireless communication module is a WIFI module, a Bluetooth module or a ZigBee module.

According to some embodiments of the invention, the second communication module is a GSM/GPRS module.

According to some embodiments of the invention, the first communication module is a power line carrier communication module.

According to some embodiments of the invention, the microcontroller employs a processor having an internal temperature sensor.

According to some embodiments of the present invention, the communication collection device further includes a temperature collection unit connected to the microcontroller, and the temperature collection unit is configured to collect the temperature of the inverter body.

The photovoltaic inverter according to the embodiment of the second aspect of the invention comprises an inverter body and the communication acquisition device connected with the inverter body.

According to the photovoltaic inverter disclosed by the embodiment of the invention, at least the following technical effects are achieved: through increase communication collection system on traditional dc-to-ac converter body, can possess the ability with the subassembly control end data interaction of bottom, can realize the collection to photovoltaic module voltage data, can realize the control whether to photovoltaic module access to photovoltaic group cluster, also can make the means more diversified with monitoring end communication simultaneously, improve the stability of communication.

A photovoltaic module control system according to an embodiment of the third aspect of the present invention includes: the photovoltaic inverter described above; the component control end is connected with the photovoltaic inverter, is used for collecting the output voltage of the photovoltaic component and transmitting the output voltage to the photovoltaic inverter, and is also used for receiving the component on-off signal sent by the photovoltaic inverter to control the on-off of the photovoltaic component; and the monitoring end is connected with the photovoltaic inverter, is used for sending the string on-off signal to the photovoltaic inverter, and is also used for receiving the output voltage and the loop current sent by the photovoltaic inverter.

The photovoltaic module control system provided by the embodiment of the invention at least has the following technical effects: by adding the photovoltaic inverter in the embodiment of the invention, data monitoring at the level of the photovoltaic module at the monitoring end can be really realized, and the photovoltaic module can be remotely turned off. Meanwhile, the cost for monitoring the whole photovoltaic power generation system can be greatly reduced by collecting the current through the photovoltaic inverter, and the current collection unit does not need to be repeatedly arranged on each photovoltaic module. In addition, the current switch of the photovoltaic inverter can be turned off firstly in the embodiment of the invention, so that the large current impact faced by the subsequent turn-off component turn-off switch can be effectively avoided, the component turn-off switch can adopt a miniaturized and low-cost switch, and the cost is further reduced.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of a photovoltaic inverter of an embodiment of the present invention;

FIG. 2 is a system block diagram of a photovoltaic module control system of an embodiment of the present invention;

fig. 3 is a schematic diagram of a temperature acquisition unit according to an embodiment of the present invention.

Reference numerals:

a first communication module 100,

A second communication module 200,

A micro-controller 300,

A component control terminal 400,

A monitoring end 500,

An inverter body 600,

The component turns off the switch 700.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, if there are first, second, third, fourth, etc. described only for the purpose of distinguishing technical features, they are not to be interpreted as indicating or implying relative importance or implying number of indicated technical features or implying precedence of indicated technical features.

In the description of the present invention, unless otherwise explicitly defined, terms such as arrangement, connection and the like should be broadly construed, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the detailed contents of the technical solutions.

A communication acquisition apparatus according to an embodiment of the first aspect of the present invention is described below with reference to fig. 1 to 3.

The communication acquisition device according to the embodiment of the invention comprises: a first communication module 100, a second communication module 200, and a micro controller 300. The first communication module 100 is used for connecting a component control terminal 400 of the photovoltaic component; the module control terminal 400 is configured to collect an output voltage of the photovoltaic module and output the output voltage to the first communication module 100, and control on/off of the photovoltaic module according to a module on/off signal output by the first communication module 100; the second communication module 200 is used for receiving the string on-off signal sent by the monitoring end 500 and transmitting loop current and output voltage to the monitoring end 500; the microcontroller 300 is used for being connected with the inverter body 600 connected with the photovoltaic string in series and receiving the loop current collected by the inverter body 600; the micro controller 300 is further connected to the first communication module 100 and the second communication module 200, and is configured to receive the output voltage and send the component on-off signal to the component control end 400 through the first communication module 100, and is further configured to receive the group string on-off signal transmitted by the monitoring end 500 and transmit the loop current and the output voltage to the monitoring end 500 through the second communication module 200.

Referring to fig. 1 and 2, the microcontroller 300 performs data interaction with the component control terminal 400 through the first communication module 100, the component control terminal 400 is used for collecting voltage data, temperature data and the like of the photovoltaic component, the data collected by the component control terminal 400 is sent to the first communication module 100, and the first communication module 100 is transmitted to the microcontroller 300. In the existing photovoltaic power generation system, the inverter body 600 connected in series with the photovoltaic string has a current collection function, and the microcontroller 300 can obtain the loop current of the photovoltaic string collected by the inverter body 600 by communicating with the inverter body 600. Because of the characteristic that the currents in the loop currents are equal everywhere, the currents of the photovoltaic modules in the photovoltaic group strings are also equal, and the current data of the photovoltaic modules are acquired through phase change. Then, the photovoltaic module level monitoring can be realized through the monitoring terminal 500 sent by the second communication module 200.

Referring to fig. 1 and 2, for implementing the component-level turn-off function, a separate turn-off control system is not required to be added, the microcontroller 300 and the first communication module 100 may be directly utilized to implement control over the component control terminal 400, and the component control terminal 400 may complete control over the component turn-off switch 700 according to a component turn-off signal sent by the microcontroller 300. The process of photovoltaic module shutdown is briefly described here: the monitoring terminal 500 sends a string on-off signal, the second communication module 200 receives the string on-off signal and transmits the string on-off signal to the micro controller 300, the micro controller 300 controls the inverter body 600 to turn off the current switch of the inverter body 600, after the turn-off is completed, the micro controller 300 sends a component on-off signal to the component control terminal 400, and the component control terminal 400 controls the component turn-off switch 700 to turn off.

In addition, it should be noted that the microcontroller 300 firstly controls the inverter body 600 to turn off the current switch of the inverter body 600, so that the disconnection of the series circuit of the photovoltaic module can be ensured, and further, the subsequent module turn-off switch 700 is not required to face the impact of a large current when being turned off, so that the module turn-off switch 700 can select a switch which has a small volume, a low cost and is not required to withstand the impact of a large current.

According to the communication acquisition device provided by the embodiment of the invention, the communication with the bottom-layer component control end 400 is realized through the first communication module 100, and the voltage data of the photovoltaic component acquired by the component control end 400 can be received and uploaded to the monitoring end 500 through the second communication module 200, so that the photovoltaic component level monitoring is realized; meanwhile, the microcontroller 300 can send a module on-off signal to the module control terminal 400 through the first communication module 100, and the module control terminal 400 turns off the module off switch 700 connected to the photovoltaic module, thereby realizing the photovoltaic module-level on-off control. Microcontroller 300 can acquire the return current of the photovoltaic group cluster that inverter body 600 gathered through the communication with inverter body 600, then ingenious utilization the equal characteristic of return current know photovoltaic module's in the photovoltaic group cluster electric current, can effectual reduction photovoltaic power generation field in current sensor's the arrangement. In addition, the micro controller 300 may control the inverter body 600 to turn off the current switch of the inverter body 600 itself, so as to disconnect the loop of the photovoltaic string, and further, the device control terminal 400 may not face the impact of the large current any more when the device turn-off switch 700 is subsequently turned off.

In some embodiments of the present invention, the first communication module 100 and/or the second communication module 200 is a wireless communication module. Data transmission is realized through wireless communication's mode, the quantity of communication line among the reduction photovoltaic power generation system that can be very big, and because photovoltaic power generation system itself is in with a comparatively spacious environment, therefore the interference during wireless communication is less, wireless transmission's distance can be effectively ensured, and then can effectual control wireless communication's cost, compare in traditional wired communication's mode, can control the rise of cost can reduce on-the-spot wiring again, and then whole photovoltaic power generation system's security, stability have been improved.

In some embodiments of the present invention, the wireless communication module is a WIFI module, a Bluetooth module, or a ZigBee module. The wireless communication mode is more, can select wireless transmission modes such as WIFI, Bluetooth, zigBee to communicate according to the size in user demand and place. In some embodiments of the invention, the wireless communication module selects a ZigBee module for communication, and the ZigBee module is low in cost and long in communication distance, so that the requirements of most photovoltaic power generation systems are met.

In some embodiments of the present invention, the second communication module 200 is a GSM/GPRS module. After the GSM/GPRS module is adopted, ultra-long-distance wireless communication can be realized in a mode of a built-in SIM card, data transmission can be completed by directly utilizing the existing mobile base station, and an ultra-long-distance wireless communication system does not need to be additionally arranged to realize the ultra-long-distance wireless communication.

In some embodiments of the present invention, the first communication module 100 is a plc communication module. The communication is carried out in a power carrier mode, the existing circuit is directly utilized for data communication, and wiring can be effectively reduced. Meanwhile, compared with a wireless communication mode, the method can also reduce the influence caused by electromagnetic waves.

In some embodiments of the present invention, the microcontroller 300 employs a processor with an internal temperature sensor. The temperature of the inverter body 600 can be detected through the internal temperature sensor, the temperature of the inverter body 600 can effectively feed back the working state of the inverter body 600 to a certain extent, and when the temperature of the inverter body 600 is suddenly increased or the temperature of the inverter body 600 exceeds the normal temperature, the monitoring terminal 500 can be timely warned.

In some embodiments of the present invention, the micro controller 300 employs an MSP430 series single chip microcomputer. The temperature sensor inside the MSP430 series single-chip microcomputer is relatively accurate in acquisition, low in cost and suitable for large-scale application.

In some embodiments of the present invention, the communication collecting device further includes a temperature collecting unit connected to the microcontroller 300, and the temperature collecting unit is configured to collect the temperature of the inverter body 600. Through the mode of plus temperature acquisition unit, can make partly not possess inside temperature sensor's microcontroller 300 also can be used for temperature acquisition, simultaneously through the mode of plus temperature acquisition unit, also can make the position of gathering the temperature more nimble, the temperature data of gathering also can be more accurate relatively. In some embodiments of the invention, the temperature acquisition unit directly employs an existing temperature acquisition module.

In some embodiments of the present invention, the temperature acquisition unit employs a resistive temperature sensor for temperature acquisition. The resistance type temperature sensor has low cost, can further reduce the cost and is convenient for subsequent replacement. When the temperature acquisition unit adopts the resistance-type temperature sensor to acquire temperature, the application circuit of the temperature acquisition unit can refer to fig. 3, temperature data can be directly and effectively fed back through the voltage division circuit, and the temperature data is input into the microcontroller 300 after being isolated and protected through the voltage follower and the clamp protection circuit. The resistor R1 can be a variable resistor, and the application range of the temperature acquisition unit can be improved. In addition, slight errors can occur in parts of devices in the circuit due to aging, and the errors can be corrected by adjusting the variable resistor, so that the service life is further prolonged. In addition, the temperature acquisition unit is connected to the ADC port of the microcontroller 300 to realize the transmission of temperature data.

The photovoltaic inverter according to the embodiment of the second aspect of the present invention includes the inverter body 600 and the above-mentioned communication collecting device connected to the inverter body 600.

According to the photovoltaic inverter provided by the embodiment of the invention, the communication acquisition device is added on the traditional inverter body 600, so that the photovoltaic inverter has the capability of communicating with the bottom component control end 400, the acquisition of voltage data of the photovoltaic component can be realized, the control on whether the photovoltaic component is connected to a photovoltaic group string can be realized, meanwhile, the communication means with the monitoring end 500 can be more diversified, and the communication stability is improved.

The photovoltaic module control system according to the third aspect of the present invention includes the photovoltaic inverter, the module control terminal 400, and the monitoring terminal 500; the module control terminal 400 is connected with the photovoltaic inverter, is used for collecting the output voltage of the photovoltaic module and transmitting the output voltage to the photovoltaic inverter, and is also used for receiving a module on-off signal sent by the photovoltaic inverter and controlling the on-off of the photovoltaic module; and the monitoring end 500 is connected with the photovoltaic inverter, and is used for sending a string on-off signal to the photovoltaic inverter and receiving the output voltage and the loop current sent by the photovoltaic inverter.

Referring to fig. 2, the pv strings are serially connected to a pv inverter, through which dc power is converted to ac power. Referring to the foregoing, the photovoltaic inverter in some embodiments of the invention includes an inverter body 600 and a communication collection device. The loop current of the photovoltaic string can be directly known through data interaction between the communication acquisition device and the inverter body 600; the receiving of the output voltage transmitted by the component control terminal 400 can be realized through the communication acquisition device; and then the data of the output voltage and the loop current are transmitted to the monitoring terminal 500 through the communication acquisition device. When the photovoltaic module needs to be turned off, the monitoring end 500 sends a string on-off signal to the communication acquisition device, the communication acquisition device controls the inverter body 600 to turn off a current switch of the inverter body 600, the power failure of the whole photovoltaic string loop is achieved, then the communication acquisition device sends a module on-off signal to the module control end 400, and the module control end 400 controls the module off-switch 700 to be turned off.

According to the photovoltaic module control system provided by the embodiment of the invention, the photovoltaic inverter is added, so that data monitoring of the photovoltaic module at the first stage at the monitoring end 500 can be really realized, and the photovoltaic module control system also has the capability of remotely turning off the photovoltaic module. Meanwhile, the cost for monitoring the whole photovoltaic power generation system can be greatly reduced by collecting the current through the photovoltaic inverter, and a current collecting unit does not need to be arranged on each photovoltaic module. In addition, the photovoltaic inverter in the embodiment of the invention firstly switches off the current switch of the photovoltaic inverter, so that the large current impact faced by the subsequent component switch-off switch 700 can be effectively avoided, the component switch-off switch 700 can be miniaturized, and the cost is further reduced.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to the embodiments, and those skilled in the art will understand that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.