CN204103863U - Based on the photovoltaic DC-to-AC converter supervisory control system of low-voltage powerline carrier communication - Google Patents

Based on the photovoltaic DC-to-AC converter supervisory control system of low-voltage powerline carrier communication Download PDF

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Publication number
CN204103863U
CN204103863U CN201420474481.5U CN201420474481U CN204103863U CN 204103863 U CN204103863 U CN 204103863U CN 201420474481 U CN201420474481 U CN 201420474481U CN 204103863 U CN204103863 U CN 204103863U
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China
Prior art keywords
photovoltaic
converter
control system
frequency division
orthogonal frequency
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Expired - Fee Related
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CN201420474481.5U
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Inventor
许宜申
周思阳
肖龙飞
顾济华
陶智
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Suzhou University
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Suzhou University
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

Abstract

The utility model discloses a kind of photovoltaic DC-to-AC converter supervisory control system based on low-voltage powerline carrier communication, this supervisory control system adopts power line as carrier media, by installing orthogonal frequency division multiplex modem at monitored end and monitoring client, orthogonal frequency division multiplex modem can by data collecting module collected to signal carry out modulation treatment and transfer on power line, or the signal of receiving demodulation power line transmission, realize the two-way communication of supervisory control system, convenient realization is to the Real-Time Monitoring of the equipment such as photovoltaic DC-to-AC converter and control, without the need to cable wiring manufacture again, transmission range can reach 3 kilometers, meet middle-size and small-size power plant scale requirement, networking flexibility, and do not need to change original system, dilatation is simple.In addition, by adopting orthogonal frequency division multiplexer modulation-demodulation signal, effectively can overcome the characteristic such as strong jamming, overdamp of power line, system constructing cost is low, safeguards simple.

Description

Based on the photovoltaic DC-to-AC converter supervisory control system of low-voltage powerline carrier communication
Technical field
The utility model belongs to photovoltaic DC-to-AC converter monitoring equipment technical field, is specifically related to a kind of photovoltaic DC-to-AC converter supervisory control system based on low-voltage powerline carrier communication.
Background technology
The communication modes carrying out monitoring for photovoltaic DC-to-AC converter in prior art is mainly wiring transmission etc., wire laying mode generally comprises: RS485 industrial bus and CAN, its wiring of RS485 industrial bus is simple, there is the advantage in price, but the various interference effects be subject in industrial environment, and utilance is not high.Its efficiency of CAN is very high, and performance is highly stable, but networking technology is comparatively complicated, and cost is higher.
Along with the development of science and technology, photovoltaic monitoring replaces cable wiring manufacture monitor mode gradually, photovoltaic monitoring is exactly by the inverter of photovoltaic plant, header box, irradiation instrument, atmospherium, the equipment such as ammeter are coupled together by data wire, the data acquisition of these equipment is carried out with photovoltaic plant data acquisition unit, and by GPRS, Ethernet, the modes such as Wi-Fi are sent to the webserver or local computing, make user can check related data on the Internet or local computing, facilitate power management personnel and the service data of user to photovoltaic plant check and manage.But there is various problems in existing photovoltaic monitoring technique, specific as follows:
Industrial Ethernet: this technology is a kind of open network based on TCP/IP, and the advantage of this technology is good compatibility and interoperability, and transmission rate is high, can be connected with Internet, but Problems existing is that its interference free performance is poor, and fail safe is lower.
Wireless mode is as ZigBee, WiFi etc., and its advantage is without the need to wiring in comparatively short distance, but exists and be subject to barrier and intercept, the problems such as price is more expensive, and performance is stable not.
In view of above problem, be necessary to propose a kind of novel photovoltaic plant supervisory control system, the problems such as in the existing supervisory control system of effective solution, wiring is complicated, cost is high, poor performance, meet middle-size and small-size power plant scale requirement, realize the real-time monitoring to equipment such as photovoltaic DC-to-AC converters and FEEDBACK CONTROL, maintain easily, effectively reduce use cost.
Utility model content
In view of this, the utility model provides a kind of photovoltaic DC-to-AC converter supervisory control system based on low-voltage powerline carrier communication, this supervisory control system adopts power line as carrier media, by conveniently can realize the real-time monitoring to equipment such as photovoltaic DC-to-AC converters at monitored end and monitoring client installation orthogonal frequency division multiplex modem; And by adopting orthogonal frequency division multiplexer modulation-demodulation signal, effectively can overcome the characteristic such as strong jamming, overdamp of power line, networking flexibility, system constructing cost is low, safeguard simple.
According to a kind of photovoltaic DC-to-AC converter supervisory control system based on low-voltage powerline carrier communication that the purpose of this utility model proposes, for gathering and transmitting state and the data message of inverter in dispersed miniature grid-connected photovoltaic system,
The data acquisition module that described supervisory control system comprises photovoltaic DC-to-AC converter, be electrically connected with described photovoltaic DC-to-AC converter, the first orthogonal frequency division multiplex modem be electrically connected with described data acquisition module and the second orthogonal frequency division multiplex modem be connected at a distance by a power line with described first orthogonal frequency division multiplex modem, described second orthogonal frequency division multiplex modem is electrically connected remote desktop monitoring display terminal;
Two-way communication is realized between described photovoltaic DC-to-AC converter, data acquisition module, the first orthogonal frequency division multiplex modem, the second orthogonal frequency division multiplex modem and remote desktop monitoring display terminal.
Preferably, described data acquisition module comprises and carries out the power unit of step-down process, master controller, communication interface and backup part to the DC power supply of photovoltaic DC-to-AC converter.
Preferably, described master controller is STM32 Series of MCU.
Preferably, the communication between described data acquisition module and photovoltaic DC-to-AC converter adopts RS485 circuit, and the communication between described data acquisition module and described first orthogonal frequency division multiplex modem adopts the enhancement mode RS485 circuit be with and isolated.
Preferably, first, second orthogonal frequency division multiplex modem described comprises main control chip, the power supply circuits providing power supply for described main control chip, zero cross detection circuit, filtering and coupling circuit respectively, and described filtering and coupling circuit are connected on power line.
Preferably, described main control chip is dsp chip.
Preferably, described remote desktop monitoring display terminal comprises main control chip controller, power-supplying circuit, indicator light, key part and display section.
Preferably, described main control chip controller is MSP430F149 single-chip microcomputer.
Compared with prior art, the disclosed advantage based on the photovoltaic DC-to-AC converter supervisory control system of low-voltage powerline carrier communication of the utility model is: this supervisory control system adopts power line as carrier media, by installing orthogonal frequency division multiplex modem at monitored end (equipment such as photovoltaic DC-to-AC converter) and monitoring client (remote desktop monitoring display terminal), orthogonal frequency division multiplex modem can by data collecting module collected to signal carry out modulation treatment and transfer on power line, or the signal of receiving demodulation power line transmission, realize the two-way communication of supervisory control system, convenient realization is to the Real-Time Monitoring of the equipment such as photovoltaic DC-to-AC converter and control, without the need to cable wiring manufacture again, transmission range can reach 3 kilometers, meet middle-size and small-size power plant scale requirement, networking flexibility, and do not need to change original system, dilatation is simple.
In addition, by adopting orthogonal frequency division multiplexer modulation-demodulation signal, effectively can overcome the characteristic such as strong jamming, overdamp of power line, system constructing cost is low, safeguards simple.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structural representation of Fig. 1 supervisory control system disclosed in the utility model.
Fig. 2 is data acquisition module block diagram.
Fig. 3 is orthogonal frequency division multiplex modem block diagram.
Fig. 4 is remote desktop monitoring display terminal block diagram.
Fig. 5 is the circuit diagram of data acquisition module.
Fig. 6 is the circuit diagram of orthogonal frequency division multiplex modem.
Fig. 7 is the circuit diagram of remote desktop monitoring display terminal.
The title of the numeral in figure or the corresponding component representated by letter:
51, the enhancement mode RS485 circuit 54 of master controller 52, power unit 53, band isolation, backup part 55, common RS485 circuit 61, main control chip 62, power supply circuits 63, filtering and coupling circuit 64, zero cross detection circuit 71, main control chip controller 72, power-supplying circuit 73, indicator light 74, key part 75, display section
Embodiment
The communication modes carrying out monitoring for photovoltaic DC-to-AC converter in prior art is mainly wiring transmission, and its cable wiring manufacture bothers, and networking technology is comparatively complicated, and cost is higher.Current photovoltaic monitoring replaces the monitor mode of cable wiring manufacture gradually, but photovoltaic monitoring is mainly through GPRS, Ethernet, the modes such as Wi-Fi are sent to the webserver or local computing, and make user can check related data on the Internet or local computing, its interference free performance is poor, fail safe is lower, and be subject to barrier obstruct, the problems such as price is more expensive, and performance is stable not.
Power line carrier communication (power line carrier communication is called for short PLC) take transmission line as the communication of power system of the transmission medium of carrier signal.Because transmission line possesses very firmly supporting construction, and set up the conductor (generally having three-phase good conductor and one or two overhead ground wire) of more than 3, so while power transmission line conveying power current, the transmission carrier signal of use, not only economy but also very reliable.
Along with the quickening of global IT application process, Internet technology obtains develop rapidly, and various broadband network technology continues to bring out.PLC technology can make full use of power line network resource the most universal, and construction speed is fast, small investment, indoor without the need to wiring, user can realize high speed Internet access by supply socket, possesses the unrivaled advantage of other access waies, therefore again obtains extensive concern both domestic and external.
Therefore, the utility model provides a kind of photovoltaic DC-to-AC converter supervisory control system based on low-voltage powerline carrier communication, this supervisory control system adopts power line as carrier media, by conveniently can realize the real-time monitoring to equipment such as photovoltaic DC-to-AC converters at monitored end and monitoring client installation orthogonal frequency division multiplex modem; And by adopting orthogonal frequency division multiplexer modulation-demodulation signal, effectively can overcome the characteristic such as strong jamming, overdamp of power line, networking flexibility, system constructing cost is low, safeguard simple.
To be clearly and completely described the technical solution of the utility model by embodiment below.Obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, a kind of photovoltaic DC-to-AC converter supervisory control system based on low-voltage powerline carrier communication, for gathering and transmitting state and the data message of inverter in dispersed miniature grid-connected photovoltaic system, this supervisory control system adopts orthogonal frequency division multiplexer modulation-demodulation signal; This technology effectively can overcome the characteristic such as strong jamming, overdamp of power line, and system constructing cost is low, safeguards simple.
The data acquisition module that supervisory control system comprises photovoltaic DC-to-AC converter, be electrically connected with photovoltaic DC-to-AC converter, the first orthogonal frequency division multiplex modem be electrically connected with data acquisition module and the second orthogonal frequency division multiplex modem be connected at a distance by a power line A with the first orthogonal frequency division multiplex modem, the second orthogonal frequency division multiplex modem is electrically connected remote desktop monitoring display terminal.
Two-way communication is realized between photovoltaic DC-to-AC converter, data acquisition module, the first orthogonal frequency division multiplex modem, the second orthogonal frequency division multiplex modem and remote desktop monitoring display terminal.Remote desktop monitoring display terminal receive and display Monitoring Data and feedback control signal to photovoltaic DC-to-AC converter.
Communication process is as follows:
The various state information of the equipment such as data collecting module collected photovoltaic DC-to-AC converter transmission of control signals, first orthogonal frequency division multiplex modem receives and utilizes Orthodoxy Frequency Division Multiplex (OFDM) technology modulation signal on power line from after the information of data acquisition module by dsp chip, shows after power line transmission by passing to remote desktop monitoring display terminal after the second orthogonal frequency division multiplex modem restituted signal of the other end.Signal transmissions directly can be monitored display terminal to remote desktop by the second orthogonal frequency division multiplex modem, unnecessarily reuses this signal of data collecting module collected.
Whole communication process is two-way, remote desktop monitoring display terminal can reciprocally transmit control signal, signal to photovoltaic DC-to-AC converter, controls the operation of photovoltaic DC-to-AC converter respectively through the second orthogonal frequency division multiplex modem, power line, the first orthogonal frequency division multiplex modem, data acquisition module.This supervisory control system is without the need to cable wiring manufacture again, and transmission range can reach 3 kilometers, meets middle-size and small-size power plant scale requirement, networking flexibility, and does not need to change original system, and dilatation is simple.
Please also refer to Fig. 2 and Fig. 5, data acquisition module is mainly used to collection two aspect data:
1, photovoltaic DC-to-AC converter exports electric parameter as rated output voltage, output-current rating, specified output frequency etc.2, photovoltaic DC-to-AC converter working status parameter, as temperature etc.
Data acquisition module comprises power unit 52, master controller 51, communication interface and backup part 54.
+ 12V the DC power supply that photovoltaic DC-to-AC converter provides by power unit 52 reduces to+3.3V.Communication interface comprises the enhancement mode RS485 circuit 53 of band isolation and common RS485 circuit 55, the enhancement mode RS485 circuit 53 of band isolation is for the communication between master controller 51 and orthogonal frequency division multiplex modem, and common RS485 circuit 55 connects master controller and communicates with photovoltaic DC-to-AC converter.The use of communication interface is determined as required, does not limit at this.
Master controller 51 is STM32 Series of MCU.This controller is modular construction, possesses the advantages such as interface is simple, performance good, operating rate is fast.
Backup part 54 is backup battery circuit.
Please also refer to Fig. 3 and Fig. 6, orthogonal frequency division multiplex modem comprises main control chip 61, the power supply circuits 62 providing power supply for main control chip 61, zero cross detection circuit 64, filtering and coupling circuit 63.
Wherein main control chip 61 is dsp chip.Adopt orthogonal frequency division multiplexer, be responsible for modulation-demodulation signal.Effectively can overcome the characteristic such as strong jamming, overdamp of power line, system constructing cost is low, safeguards simple.Wherein, dsp chip model is the DSP C2000 Series of MCU that TI company produces.
Power supply circuits 62 provide power supply for main control chip 61.Filtering and coupling circuit 63 for the signal coupling that will modulate to power line, and the low frequency spur on elimination power line.Zero cross detection circuit plays effective protective effect to orthogonal frequency division multiplex modem.
Please also refer to Fig. 4 and Fig. 7, remote desktop monitoring display terminal comprises main control chip controller 71, power-supplying circuit 72, indicator light 73, key part 74 and liquid-crystal display section 75.
The wherein MSP430F149 single-chip microcomputer produced for TI company of main control chip controller 71.This single-chip microcomputer is low in energy consumption, and rich interface is easy to expanded application, and utilize this single-chip microcomputer as main control chip, periphery connects button, buzzer, the reception photovoltaic DC-to-AC converter state information that liquid crystal display screen etc. can be real-time, realizes controlling in real time to photovoltaic DC-to-AC converter.
Main control chip controller 71 is responsible for Coping with Reality data and is accepted the instruct remote manipulation photovoltaic DC-to-AC converter of user's input; Indicator light 73 characterizes photovoltaic DC-to-AC converter state; Key part 74, after user presses, main control chip controller can be made corresponding reaction and send signal remote control photovoltaic DC-to-AC converter; The various state information of liquid-crystal display section 75 dynamical output photovoltaic DC-to-AC converter and warning message.
The utility model discloses a kind of photovoltaic DC-to-AC converter supervisory control system based on low-voltage powerline carrier communication, this supervisory control system adopts power line as carrier media, by installing orthogonal frequency division multiplex modem at monitored end and monitoring client, orthogonal frequency division multiplex modem can by data collecting module collected to signal carry out modulation treatment and transfer on power line, or the signal of receiving demodulation power line transmission, realize the two-way communication of supervisory control system, convenient realization is to the Real-Time Monitoring of the equipment such as photovoltaic DC-to-AC converter and control, without the need to cable wiring manufacture again, transmission range can reach 3 kilometers, meet middle-size and small-size power plant scale requirement, networking flexibility, and do not need to change original system, dilatation is simple.
In addition, by adopting orthogonal frequency division multiplexer modulation-demodulation signal, effectively can overcome the characteristic such as strong jamming, overdamp of power line, system constructing cost is low, safeguards simple.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (8)

1., based on a photovoltaic DC-to-AC converter supervisory control system for low-voltage powerline carrier communication, for gathering and transmitting state and the data message of inverter in dispersed miniature grid-connected photovoltaic system, it is characterized in that:
The data acquisition module that described supervisory control system comprises photovoltaic DC-to-AC converter, be electrically connected with described photovoltaic DC-to-AC converter, the first orthogonal frequency division multiplex modem be electrically connected with described data acquisition module and the second orthogonal frequency division multiplex modem be connected at a distance by a power line with described first orthogonal frequency division multiplex modem, described second orthogonal frequency division multiplex modem is electrically connected remote desktop monitoring display terminal;
Two-way communication is realized between described photovoltaic DC-to-AC converter, data acquisition module, the first orthogonal frequency division multiplex modem, the second orthogonal frequency division multiplex modem and remote desktop monitoring display terminal.
2. as claimed in claim 1 based on the photovoltaic DC-to-AC converter supervisory control system of low-voltage powerline carrier communication, it is characterized in that, described data acquisition module comprises and carries out the power unit of step-down process, master controller, communication interface and backup part to the DC power supply of photovoltaic DC-to-AC converter.
3., as claimed in claim 2 based on the photovoltaic DC-to-AC converter supervisory control system of low-voltage powerline carrier communication, it is characterized in that, described master controller is STM32 Series of MCU.
4. as claimed in claim 2 based on the photovoltaic DC-to-AC converter supervisory control system of low-voltage powerline carrier communication, it is characterized in that, communication between described data acquisition module and photovoltaic DC-to-AC converter adopts RS485 circuit, and the communication between described data acquisition module and described first orthogonal frequency division multiplex modem adopts the enhancement mode RS485 circuit be with and isolated.
5. as claimed in claim 1 based on the photovoltaic DC-to-AC converter supervisory control system of low-voltage powerline carrier communication, it is characterized in that, first, second orthogonal frequency division multiplex modem described comprises main control chip, the power supply circuits providing power supply for described main control chip, zero cross detection circuit, filtering and coupling circuit respectively, and described filtering and coupling circuit are connected on power line.
6., as claimed in claim 5 based on the photovoltaic DC-to-AC converter supervisory control system of low-voltage powerline carrier communication, it is characterized in that, described main control chip is dsp chip.
7. as claimed in claim 1 based on the photovoltaic DC-to-AC converter supervisory control system of low-voltage powerline carrier communication, it is characterized in that, described remote desktop monitoring display terminal comprises main control chip controller, power-supplying circuit, indicator light, key part and display section.
8., as claimed in claim 7 based on the photovoltaic DC-to-AC converter supervisory control system of low-voltage powerline carrier communication, it is characterized in that, described main control chip controller is MSP430F149 single-chip microcomputer.
CN201420474481.5U 2014-08-21 2014-08-21 Based on the photovoltaic DC-to-AC converter supervisory control system of low-voltage powerline carrier communication Expired - Fee Related CN204103863U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108983686A (en) * 2017-05-31 2018-12-11 南京聚鲲物联网科技有限公司 A kind of method of Miniature inverter monitoring management
CN111245101A (en) * 2020-03-20 2020-06-05 江苏固德威电源科技股份有限公司 Control circuit and control method for one-key remote turn-off inverter and inverter
CN113114303A (en) * 2021-03-19 2021-07-13 江苏固德威电源科技股份有限公司 Anti-interference method of photovoltaic power carrier data collector in double-split transformer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108983686A (en) * 2017-05-31 2018-12-11 南京聚鲲物联网科技有限公司 A kind of method of Miniature inverter monitoring management
CN111245101A (en) * 2020-03-20 2020-06-05 江苏固德威电源科技股份有限公司 Control circuit and control method for one-key remote turn-off inverter and inverter
CN113114303A (en) * 2021-03-19 2021-07-13 江苏固德威电源科技股份有限公司 Anti-interference method of photovoltaic power carrier data collector in double-split transformer

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