CN104617874A - Controlling method of photovoltaic system for realizing control node communication without communication cable - Google Patents
Controlling method of photovoltaic system for realizing control node communication without communication cable Download PDFInfo
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- CN104617874A CN104617874A CN201510083463.3A CN201510083463A CN104617874A CN 104617874 A CN104617874 A CN 104617874A CN 201510083463 A CN201510083463 A CN 201510083463A CN 104617874 A CN104617874 A CN 104617874A
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- H02J3/385—
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- 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
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a controlling method of photovoltaic system for realizing control node communication without a communication cable. The method comprises the steps of realizing the control between a combiner box with an MPPT (Maximum Power Point Tracking) optimizing function and a photovoltaic grid-connected inverter, and modulating voltage or current signals according to an agreed communication way, so as to transmit some important control information to other control nodes to achieve an aim of control. The controlling method provided by the invention has the advantages below: firstly, no extra communication cost can be increased, the system is simple, and the cost is low; secondly, the power cable is reliable to connect, and the communication reliability can be improved greatly; and thirdly, the instant loss of generating capacity cannot be caused.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, particularly relate to a kind of photovoltaic system based on the control method realizing Controlling vertex communication without connection.
Background technology
In the middle of field of solar thermal power generation, traditional centralized combining inverter occupies very large proportion, the program adopts centralized control, Controlling vertex is single, each square formation accesses centralized inverter by after the header box parallel connection of unequal number amount, and the maximum power optimizing of cell panel and inversion grid connection generating have been unified by inverter.And header box part without any control action, only demands are exactly the cell plate voltage current status of each group of string of this header box of monitoring, sent to the background monitoring in power station again by communication mode, inverter to its data monitored without any demand, if there is demand, then need to communicate to connect the two just can carry out data interaction, the communication networking requirement like this for whole square formation is just higher.
Be present in the control program of another cell panel maximum power optimizing and parallel network reverse at present: allow header box complete by cell panel maximum power optimal-search control function, namely with the header box of MPPT maximum power point tracking (MPPT) optimizational function, header box exports and access inverter after parallel connection, parallel network reverse work transfers to inverter to unify, so just be present in multiple Controlling vertex, each Controlling vertex needs to know some control informations of other nodes thus adjusts oneself control.Traditional scheme by connection, each node is carried out networking to carry out information respective alternately, so just need to increase corresponding communication interface circuit, comprise the corresponding communication cable that may increase, for a large-scale surface power station, both add difficulty of construction, turn increase debugging and the maintenance difficulties in construction cost and later stage.In addition, if once occur that telecommunication cable connects, the dependent failure of communication interface circuit, the work of whole system just may being caused abnormal, therefore when the work of inverter system is too dependent on the mode of traditional communication line, greatly reducing causing the reliability of system.
Summary of the invention
The object of the invention is to by a kind of photovoltaic system based on realize without connection Controlling vertex communication control method, solve the problem that above background technology part is mentioned.
For reaching this object, the present invention by the following technical solutions:
Photovoltaic system is based on the control method realizing Controlling vertex communication without connection, and it comprises:
With the communication response mode between the header box of MPPT optimizational function and photovoltaic combining inverter in setting photovoltaic system;
In the described header box with MPPT optimizational function and photovoltaic combining inverter, arbitrary Controlling vertex is according to described communication response mode, and the voltage exported by modulation or current signal communicate information on power cable;
Resolve detected the change of voltage or electric current by Controlling vertex after, obtain control information.
Especially, described photovoltaic combining inverter can recognize the state feedback of each header box with MPPT optimizational function, thus realizes the control of closed loop.
The photovoltaic system that the present invention proposes realizes with the control between the header box of MPPT optimizational function and photovoltaic combining inverter based on the control method realizing Controlling vertex communication without connection by the mode that power cable sets up simple communication, the modulation of voltage or current signal is carried out according to the communication modes of agreement, thus some important control informations are delivered to other Controlling vertex, reach control object.Advantage of the present invention is as follows: one, do not increase extra communications cost, and system is simple, and cost is low; Two, power cable connects reliable, and communication reliability promotes greatly; Three, the instant loss of energy output can not be caused.
Accompanying drawing explanation
Fig. 1 for the embodiment of the present invention provide based on realize without connection Controlling vertex communication photovoltaic system structural representation;
The photovoltaic system that Fig. 2 provides for the embodiment of the present invention is based on the control method flow chart realizing Controlling vertex communication without connection;
The regulator curve figure of the photovoltaic combining inverter that Fig. 3 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, illustrate only part related to the present invention in accompanying drawing but not full content, unless otherwise defined, all technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present invention understand usually.Term used herein, just in order to describe specific embodiment, is not intended to be restriction the present invention.
Please refer to shown in Fig. 1, Fig. 1 for the embodiment of the present invention provide based on realize without connection Controlling vertex communication photovoltaic system schematic diagram.
Several cell plate group strings, header box, power distribution cabinet, photovoltaic combining inverter, transformer and electrical network with MPPT optimizational function is comprised based on the photovoltaic system realizing Controlling vertex communication without connection in the present embodiment.
As shown in Figure 2, in the present embodiment, photovoltaic system specifically comprises based on the control method realizing Controlling vertex communication without connection: with the communication response mode between the header box of MPPT optimizational function and photovoltaic combining inverter in S1, setting photovoltaic system.Wherein, described communication response mode is different because of the difference of Controlling vertex, Control Cooling, can arrange flexibly as required, does not repeat them here.In S2, the described header box with MPPT optimizational function and photovoltaic combining inverter, arbitrary Controlling vertex is according to described communication response mode, and the voltage exported by modulation or current signal are communicated information on power cable.S3, detected voltage or electric current by Controlling vertex change after resolve, obtain control information.It should be noted that, generally, the present invention is applicable to from the header box side issue an order of photovoltaic combining inverter side direction with MPPT optimizational function.If coordinated with the state communication cable in the header box of MPPT optimizational function, photovoltaic combining inverter identifiable design to the state feedback of the header box with MPPT optimizational function, thus realizes the control of closed loop.
Needing to notify each optimizer conversion work state with the header box of MPPT optimizational function with photovoltaic combining inverter, is example as adjusted to holding state.During work, photovoltaic combining inverter only need by controlling to export instantaneous power, DC input voitage can be modulated into and superpose square-wave voltage by a small margin on average voltage, the change of output voltage respectively be detected with the header box of MPPT optimizational function, namely may correspond to the corresponding operating state of adjustment.As shown in Figure 3, Y-axis represents direct voltage, and X-axis represents the time, the T1 moment, and photovoltaic combining inverter starts adjustment and controls, and raises input voltage (corresponding electric current also corresponding change can occur), and according to the rule adjustment voltage magnitude set.The T2 moment returns to normal condition.Because regulation time is very short, and in adjustment process, the MPPT optimizer of front end is still operated in normal maximum power output state, therefore this adjustment mode on photovoltaic system energy output without any impact.
Technical scheme of the present invention realizes with the control between the header box of MPPT optimizational function and photovoltaic combining inverter by the mode that power cable sets up simple communication, the modulation of voltage or current signal is carried out according to the communication modes of agreement, thus some important control informations are delivered to other Controlling vertex, reach control object.Advantage of the present invention is as follows: one, do not increase extra communications cost, and system is simple, and cost is low; Two, power cable connects reliable, and communication reliability promotes greatly; Three, the instant loss of energy output can not be caused.
Note, above are only preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute and can not protection scope of the present invention be departed from.Therefore, although be described in further detail invention has been by above embodiment, the present invention is not limited only to above embodiment, when not departing from the present invention's design, can also comprise other Equivalent embodiments more, and scope of the present invention is determined by appended right.
Claims (2)
1. photovoltaic system is based on the control method realizing Controlling vertex communication without connection, it is characterized in that, comprising:
With the communication response mode between the header box of MPPT optimizational function and photovoltaic combining inverter in setting photovoltaic system;
In the described header box with MPPT optimizational function and photovoltaic combining inverter, arbitrary Controlling vertex is according to described communication response mode, and the voltage exported by modulation or current signal communicate information on power cable;
Resolve detected the change of voltage or electric current by Controlling vertex after, obtain control information.
2. photovoltaic system according to claim 1 is based on the control method realizing Controlling vertex communication without connection, it is characterized in that, described photovoltaic combining inverter can recognize the state feedback of each header box with MPPT optimizational function, thus realizes the control of closed loop.
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| CN101009501A (en) * | 2006-01-24 | 2007-08-01 | 黄勇 | A DC power line carrier communication method, system and lamp series using the system |
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| CN204089729U (en) * | 2014-07-25 | 2015-01-07 | 阳光电源股份有限公司 | A kind of photovoltaic DC-to-AC converter and photovoltaic generating system |
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2015
- 2015-02-13 CN CN201510083463.3A patent/CN104617874A/en active Pending
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|---|---|---|---|---|
| CN101009501A (en) * | 2006-01-24 | 2007-08-01 | 黄勇 | A DC power line carrier communication method, system and lamp series using the system |
| CN202196155U (en) * | 2011-01-25 | 2012-04-18 | 上海岩芯电子科技有限公司 | Solar cell panel state monitoring system |
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Address after: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant after: SINENG ELECTRIC Co.,Ltd. Address before: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant before: Top energy Electric Co.,Ltd. Address after: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant after: Top energy Electric Co.,Ltd. Address before: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant before: WUXI SINENG NEW ENERGY CO.,LTD. Address after: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant after: SINENG ELECTRIC Co.,Ltd. Address before: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant before: WUXI SINENG NEW ENERGY CO.,LTD. |
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Application publication date: 20150513 |
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