CN102546339A - Network communication protocol for solar PV power station system - Google Patents
Network communication protocol for solar PV power station system Download PDFInfo
- Publication number
- CN102546339A CN102546339A CN2012100169754A CN201210016975A CN102546339A CN 102546339 A CN102546339 A CN 102546339A CN 2012100169754 A CN2012100169754 A CN 2012100169754A CN 201210016975 A CN201210016975 A CN 201210016975A CN 102546339 A CN102546339 A CN 102546339A
- Authority
- CN
- China
- Prior art keywords
- data
- power plant
- communications protocol
- solar
- interface circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The invention relates to a network communication protocol for a solar PV power station system. The network communication protocol comprises two or more bidirectional interface circuits between which a public grounding wire and a bidirectional signal transmitting wire are connected, and the two or more interface circuits mutually achieves signal transmission through the bidirectional signal wire. The communication protocol provided by the invention is very simple and has low device cost and stronger anti-interference ability, and misoperation caused by electromagnetic interference among the components can be avoided.
Description
Technical field
The present invention relates to the solar energy power generating field, especially a kind of network communication protocol that uses the solar photovoltaic assembly networking to build a station.
Background technology
Traditional solar photovoltaic generation system is arranged rule by many solar photovoltaic battery components according to certain assembly and is formed the solar photovoltaic assembly array and conflux through header box at the array end and form photovoltaic generating system.According to the demand of power consumption equipment, photovoltaic generating system can be divided into the direct current stand alone generating system, exchange stand alone generating system and (interchange) grid-connected system.Exchange photovoltaic generating system and must convert the direct current that every photovoltaic module produces the use of to alternating current confession AC electric equipment through inverter.Different according to conflux mode and AC/DC inversion node thereof of photovoltaic module electric current, the photovoltaic module array that is used to exchange photovoltaic generating system can be divided into photovoltaic array and concentrate inversion networking topology, photovoltaic array group string inversion networking topological sum photovoltaic array component inversion networking topology to exchange photovoltaic generation networking topology for three kinds.
Be under the natural environment photovoltaic module of work, the local shade of assembly covers, latent the splitting of assembly sensitive surface grieshoch skewness and part battery all will cause photovoltaic module power to reduce even lost efficacy.Concentrate in the structure of inversion networking topological sum group string layering inversion networking topology at array, reduction of the power of monolithic element and inefficacy can cause the significantly reduction of whole generating system power.Wherein array concentrates entire system power loss that inversion causes to reduce greater than the entire system power due to the group string layering inversion.Therefore, adopt photovoltaic plant the minimizing gradually of networking inversion unit of building a station, can effectively reduce the significantly reduction that reduces the entire system power that causes because of indivedual photovoltaic module power, facilitate the raising of electricity generation system integral body photovoltaic resource utilization.Use towards the miniature inverter of photovoltaic module and the combination of assembly; Therefore having reached minimizing of photovoltaic alternating current power-generating system inversion unit, is up to now through the most effective a kind of method of networking topology raising photovoltaic resources utilance based on the assembly inversion photovoltaic of the miniature inverter group network topological structure of building a station.
Not only facilitated effective raising of solar power station photovoltaic resources utilance based on the assembly inversion networking topology of miniature inverter; And objectively require the effective communication network of framework between photovoltaic plant master-control room and all minimum inversion units; Use and guarantee in the solar photovoltaic power plant electricity generation system, the power station master-control room is implemented real-time working condition supervision, failure diagnosis and regulation and administration thereof to miniature inverter and assembly thereof.It is this that master-control room, the intelligent communication network that covers solar photovoltaic power plant photovoltaic array and sensible photovoltaic module level should satisfy that long transmission distance, information and signal transmission reliability are high, network operation failure rate is low and the anti-interference strong and low characteristics of networking cost of environment towards the power station.
Common wireless telecommunications (WIFI) or electric line carrier communication (the PLC-Power Line Communication) mode that adopts of the miniature inverter of photovoltaic has following characteristics at present:
Wherein the complexity of the communications protocol that adopted of wireless telecommunications and electric line carrier communication mode thereof is the main reason that causes device cost higher; Do not adopting under the trunking scheme condition, the signal transmission distance of wireless telecommunications and electric line carrier communication mode thereof is shorter; The wireless communication mode antijamming capability is relatively poor, this exist under the environment of a large amount of electromagnetic interference particularly outstanding.Adopt miniature inverter to use inner embedded type inductive element in large quantities as the solar photovoltaic assembly array of parallel network reverse minimum unit; The electromagnetic interference that these inductance elements produced is carried out the rapid reduction of signal transmission reliability with directly causing based on wireless communication mode or electric line carrier communication mode.In addition, the contradiction between wireless telecommunications and the lifting of electric line carrier communication mode data effective propagation path and additional firmware equipment cost and the power consumption also is to hinder the important reason that miniature inverter is used for the large-scale ground power station.Calculate according to the land resource consumption of 1.2 square metres/100W, 10MW ground light overhead utility will consume the land resource more than 120,000 square metres, and this is a huge square formation that has 50,000 photovoltaic modulies, 350X350 square metre.Except the input of the existence of numerous electromagnetic interference sources and a large amount of signal transmission trunking equipment, the increase of attendant's human resources, signal transmission delay also is the problem that must consider.
Summary of the invention
The technical problem that the present invention will solve is: propose a kind of to the communications protocol between photovoltaic plant assembly array and the power station master-control room.
The technical scheme that the present invention adopted is: a kind of solar photovoltaic assembly network communication protocol; Comprise two or more bidirectional interface circuit; Be connected with a common ground line and a two-way signaling conveyer line between described two or more bidirectional interface circuit, carry out the transmission of signal between two or more interface circuits through bidirectional signal line.
Specifically, the binary message of bidirectional signal line of the present invention transmission 0 and 1, coding uses " Manchester Code ", promptly described 0 information definition be level by high step-down, described 1 information definition is that level uprises by hanging down.The height of holding wire level can be got common low voltage logic level such as 2.5V according to environment for use, and 3.3V or high voltage level are from 11V to 18V.
Bidirectional interface circuit of the present invention is the interface circuit that CMOS bidirectional interface circuit, photoelectricity coupling circuit or any can two-way transmission signals.Described bidirectional interface circuit is respectively as control end and controlled end; Described control end is a central control room, and controlled end is photovoltaic module, have the photovoltaic module or the miniature inverter (close and be called minimum controlled cell) of miniature inverter or do not have inverter and data acquisition and communication function are only arranged.Every n minimum controlled cell (abbreviation controlled end) formed a group, and m group formed a solar power station.Described control end sends addressing, control command and control data to controlled end and accept the data that controlled end is passed back; Described controlled end is accepted instruction that control end sends or data and is changed the setting of assembly inverter or get back to control end to the service data of this assembly through same holding wire anti-pass by the requirement of instruction or data.Described signal transfer mode comprises forward pass and two kinds of passbacks, and arq mode selects position, data bit, check bit sum stop bits to form by start bit, address choice position, address bit, data before the described signal; Described signal passback pattern is made up of start bit, data bit, check digit and stop bits.
The invention has the beneficial effects as follows: the communications protocol of employing is very simple, and is low based on the communication device cost of such communications protocol, and antijamming capability is more intense, can not cause misoperation because of the interference of electromagnetism between the minimum controlled cell.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is a structural representation of the present invention;
Fig. 2 is photovoltaic plant assembly array communication network figure;
Fig. 3 is a forward pass signal format sketch map;
Fig. 4 is a return path signal form sketch map;
A is to the excessive sequential chart of passback by forward pass among Fig. 5; B be passback to forward pass excessively with forward to the excessive sequential chart of forward pass.
Embodiment
Combine accompanying drawing and preferred embodiment that the present invention is done further detailed explanation now.These accompanying drawings are the sketch map of simplification, basic structure of the present invention only is described in a schematic way, so it only show the formation relevant with the present invention.
Bidirectional interface circuit among the figure one is respectively the communication interface of control end and controlled end, and it is a CMOS bidirectional interface circuit.Control end among the figure one is in the central control room in power station, and control end is the master control person (Master) of communication bus.It sends to control end addressing information, control command and control data controlled end and accepts the data that controlled end is passed back.Controlled end (Slaver) is photovoltaic module in the photovoltaic plant array or the inverter that connects photovoltaic module.It is accepted instruction and data that control end sends and changes the setting and the operating state of assembly or inverter by the requirement of instruction, perhaps the service data of this assembly is got back to control end through same holding wire anti-pass.Figure two has provided a photovoltaic plant assembly array communication network connection layout.
The message interchange format of control end and controlled end or protocol frame are shown in figure three.One has 22.Tabulate below:
Consider solar photovoltaic power plant to as the amount of information exchange of the photovoltaic module of minimum controlled cell or inverter and little, rate request is not high yet, so the signal transfer rate can be decided to be 1MHz (T=1s).The level of holding wire is not kept a high position when having signal to transmit.The forward pass signal is sent by control end.
Setting SA is in order to carry out the control of one group of solar photovoltaic assembly easily as the address choice function of minimum controlled cell in the agreement.Often more need carry out Synchronization Control for a large-scale power station to one group of assembly.SA position in the agreement provides this function.Address bit AB7-AB0 representative is the address of one group of photovoltaic module when SA is ' 1 ', and address bit AB7-AB0 representative is the address of each assembly in this group when SA is ' 0 '.
SD in the agreement is as the selection signal of photovoltaic group network control command and control data, and data bit CD7-CD0 representative is the operational order that control end sends controlled end when SD is ' 1 '.Data bit CD7-CD0 representative is operating parameter when SD is ' 0 '.
Parity check bit is used for controlled end the signal that is received is carried out error checking.
The transmission frequency of setting signal is decided to be 1MHz (T=1us) in the agreement. also can orientate (T=2～0.2us) as according to the length of what or holding wire of network node from 500KHz～5MHz.
The signal transfer rate that adopts 1MHz in the agreement is that lead used when considering networking can adopt common lead thereby can reduce cost.If network size is bigger and hope can improve when speed of information exchange is fast signal transfer rate in the agreement.
What figure four provided is return path signal.Return path signal is sent by the minimum controlled cell as the terminal.Because the terminal is a controlled end, and minimum controlled cell mainly returns some running state information at terminal, so only need data bit (BW7-BW0).
It is signal handoff procedure sequential that figure five gives.Because be the monobus form, so must adopt time-sharing format to carry out forward pass and passback.
J among the figure five and k can decide according to the size of network and the length of line.It is relatively good that general requirements＞10T. fixes on 10T～25T, the too big speed that can cause oversize thereby reduction Communication Control of stand-by period.
Address bit AB7-AB0 among the figure three is based in the network every group of solar photovoltaic assembly and counts m and be no more than 256, and each solar power station group is counted n and is no more than 256 groups and fixed.The present invention also be applicable to photovoltaic module number in the solar photovoltaic power plant group network topological structure greater than 65536, promptly organize number greater than 256, every group of package count be greater than 256 situation.At this moment only need address size is increased according to the network size figure place of address.
The controlled operation instruction set that data bit CD7-CD0 among the figure three is based on assembly in the solar photovoltaic power plant is not more than 256 orders, and control data is not more than 256 groups of data and is fixed.Need the order and the required operating data of the operation of control to require digit is increased or reduces in the also visual concrete solar energy photovoltaic system of its concrete figure place.
What describe in the above specification is embodiment of the present invention; Various not illustrating constitutes restriction to flesh and blood of the present invention; Under the those of ordinary skill of technical field after having read specification can to before described embodiment make an amendment or be out of shape, and do not deviate from essence of an invention and scope.
Claims (7)
1. solar photovoltaic power plant grid communications protocol; It is characterized in that: comprise two or more bidirectional interface circuit; Be connected with a common ground line and a two-way signaling conveyer line between described two or more bidirectional interface circuit, carry out the transmission of signal between two or more interface circuits through bidirectional signal line.
2. solar photovoltaic power plant grid communications protocol as claimed in claim 1; It is characterized in that: the binary message of described bidirectional signal line transmission 0 and 1; Described 0 information definition be level by high step-down, to be level uprised by low described 1 information definition.
3. solar photovoltaic power plant grid communications protocol as claimed in claim 1; It is characterized in that: having one in described two or more bidirectional interface circuit is as control end and remaining is as controlled end; Described control end is a central control room; Controlled end is photovoltaic module or links the inverter of photovoltaic module, and described control end sends addressing, control command and control data to controlled end and accept the data that controlled end is passed back; Described controlled end is accepted instruction that control end sends or data and is changed the setting of assembly inverter or get back to control end to the service data of this assembly through same holding wire anti-pass by the requirement of instruction or data.
4. solar photovoltaic power plant grid communications protocol as claimed in claim 3 is characterized in that: the every n of described photovoltaic module assembly formed a group, and m group formed a solar power station.
5. solar photovoltaic power plant grid communications protocol as claimed in claim 1 is characterized in that: described bidirectional interface circuit is the interface circuit that CMOS bidirectional interface circuit, photoelectricity coupling circuit or any can two-way transmission signals.
6. solar photovoltaic power plant grid communications protocol as claimed in claim 1; It is characterized in that: described signal transfer mode comprises forward pass and two kinds of passbacks, and arq mode selects position, data bit, check bit sum stop bits to form by start bit, address choice position, address bit, data before the described signal; Described signal passback pattern is made up of start bit, data bit, check digit and stop bits.
7. solar photovoltaic power plant grid communications protocol as claimed in claim 1 is characterized in that: said photovoltaic module comprises inverter or does not comprise inverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210016975.4A CN102546339B (en) | 2012-01-19 | 2012-01-19 | Solar photovoltaic power plant grid communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210016975.4A CN102546339B (en) | 2012-01-19 | 2012-01-19 | Solar photovoltaic power plant grid communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102546339A true CN102546339A (en) | 2012-07-04 |
| CN102546339B CN102546339B (en) | 2016-05-25 |
Family
ID=46352340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210016975.4A Active CN102546339B (en) | 2012-01-19 | 2012-01-19 | Solar photovoltaic power plant grid communication system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102546339B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104410106A (en) * | 2014-11-28 | 2015-03-11 | 浙江昱能科技有限公司 | Photovoltaic inverter, inverter system and communication networking method for inverter system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101946385A (en) * | 2008-02-11 | 2011-01-12 | 西门子公司 | Pv sub-generator junction box, pv generator junction box, and pv inverter for a pv system, and pv system |
| CN101945030A (en) * | 2010-08-24 | 2011-01-12 | 上海纽恩新能源科技有限公司 | Communication method for monitoring inverter on basis of MODBUS protocol |
| CN201893731U (en) * | 2010-12-08 | 2011-07-06 | 何峰 | Intelligent photovoltaic assembly |
-
2012
- 2012-01-19 CN CN201210016975.4A patent/CN102546339B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101946385A (en) * | 2008-02-11 | 2011-01-12 | 西门子公司 | Pv sub-generator junction box, pv generator junction box, and pv inverter for a pv system, and pv system |
| CN101945030A (en) * | 2010-08-24 | 2011-01-12 | 上海纽恩新能源科技有限公司 | Communication method for monitoring inverter on basis of MODBUS protocol |
| CN201893731U (en) * | 2010-12-08 | 2011-07-06 | 何峰 | Intelligent photovoltaic assembly |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104410106A (en) * | 2014-11-28 | 2015-03-11 | 浙江昱能科技有限公司 | Photovoltaic inverter, inverter system and communication networking method for inverter system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102546339B (en) | 2016-05-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103986182A (en) | Photovoltaic grid connected system based on power line carrier communication | |
| CN102263593A (en) | FTTH (fiber to the home)-based energy efficiency intelligent management and broadband access system and method | |
| CN205921397U (en) | Little electric wire netting network deployment based on ac bus | |
| CN204833699U (en) | Low pressure intelligence table power consumption information acquisition parallel communication system based on lonWorks technique | |
| CN208874300U (en) | A kind of energy storage inverter and machine synchronous signal circuit | |
| CN202524413U (en) | Network communication for solar photovoltaic power station system | |
| CN105305493A (en) | Independent light-storage micro-grid topology for interconnected operation | |
| CN209572023U (en) | A kind of protocol conversion apparatus based on Zigbee wireless communication | |
| CN103676877A (en) | Intelligent power supply control device based on PLC and Wifi | |
| CN205212878U (en) | Novel charge stake intelligent network deployment equipment | |
| CN102546339A (en) | Network communication protocol for solar PV power station system | |
| CN205104918U (en) | Big power convertor principal and subordinate control system | |
| CN205545365U (en) | Intelligence house protocol converter | |
| CN205864459U (en) | A kind of electric power 2,000,000 signal transfers the converting system of ethernet network signal to | |
| CN205992865U (en) | A kind of composite cable and many level Cascade H-Bridge Inverters connection system | |
| CN205142215U (en) | HSR looped netowrk of communicating between communication device station between standing | |
| CN202772881U (en) | Carrier current loop communication device of solar photovoltaic module array condition monitoring system | |
| CN203278884U (en) | Data communication device of wind power current transformer | |
| CN207098618U (en) | A kind of alternating current-direct current network system of the new energy access based on VSC | |
| CN202353592U (en) | Power broadband data exchanger and electricity meter networking system using same | |
| CN206948365U (en) | A kind of convenient and practical Ethernet HSR and PRP protocol conversion apparatus | |
| CN205862265U (en) | A kind of data transmission system of photovoltaic power optimizer based on optical fiber ring network | |
| CN211958864U (en) | Power distribution terminal system with 5G multi-service communication function | |
| CN205040038U (en) | Multifunctional communication device | |
| CN108765920A (en) | A kind of electricity consumption acquisition system based on single fiber bi-directional polymer optical fiber communication module |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C53 | Correction of patent of invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Du Yinghong Inventor after: Wang Shenghong Inventor after: Ma Heping Inventor after: Wu Baohua Inventor before: Du Yinghong Inventor before: Wang Shenghong Inventor before: Ma Heping |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: DU YINGHONG WANG SHENGHONG MA HEPING TO: DU YINGHONG WANG SHENGHONG MA HEPING WU BAOHUA |
|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191218 Address after: 215100 unit 15, floor 13, building 21, No. 388, Xinping street, industrial park, Wuzhong District, Suzhou City, Jiangsu Province Patentee after: Suzhou Hongxin integrated circuit Co., Ltd Address before: 2386 Claire street, York, NY Co-patentee before: Du Yinghong Patentee before: Wang Shenghong |