CN105515208A - Photovoltaic-energy storage system and communication method of internal data exchange of photovoltaic-energy storage system - Google Patents
Photovoltaic-energy storage system and communication method of internal data exchange of photovoltaic-energy storage system Download PDFInfo
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- CN105515208A CN105515208A CN201510989060.5A CN201510989060A CN105515208A CN 105515208 A CN105515208 A CN 105515208A CN 201510989060 A CN201510989060 A CN 201510989060A CN 105515208 A CN105515208 A CN 105515208A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 87
- 230000006854 communication Effects 0.000 title claims abstract description 68
- 238000004891 communication Methods 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title abstract description 7
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 101
- 238000007599 discharging Methods 0.000 claims description 91
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 229910001416 lithium ion Inorganic materials 0.000 claims description 3
- 238000010248 power generation Methods 0.000 abstract 4
- 230000005540 biological transmission Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- NHDHVHZZCFYRSB-UHFFFAOYSA-N pyriproxyfen Chemical compound C=1C=CC=NC=1OC(C)COC(C=C1)=CC=C1OC1=CC=CC=C1 NHDHVHZZCFYRSB-UHFFFAOYSA-N 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/40—Network security protocols
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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
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention relates to a photovoltaic-energy storage system and a communication method of internal data exchange of the photovoltaic-energy storage system. The photovoltaic-energy storage system includes a photovoltaic power generation system and an energy storage system; the photovoltaic power generation system comprises a photovoltaic array and a photovoltaic power generation inverter; the energy storage system includes five bidirectional charge and discharge converter units and identical energy storage media corresponding to the five bidirectional charge and discharge converter units, wherein the bidirectional charge and discharge converter units are a bidirectional charge and discharge converter 1, a bidirectional charge and discharge converter 2, a bidirectional charge and discharge converter 3, a bidirectional charge and discharge converter 4 and a bidirectional charge and discharge converter 5; and the direct-current input positive ends and negative ends of the five bidirectional charge and discharge converter units are connected with the positive end and negative end of a direct-current busbar. With the photovoltaic-energy storage system and the communication method of internal data exchange of the photovoltaic-energy storage system of the invention adopted, problems in data exchange between the photovoltaic power generation system and the energy storage system, between a host and a slave in the energy storage system, as well as between the bidirectional charge and discharge converter 1 and a touch screen can be solved, system control can be clear, and the realization of functions such as coordinated control and related display of system energy can be benefitted. The photovoltaic-energy storage system and the communication method of internal data exchange of the photovoltaic-energy storage system thereof have bright application prospects.
Description
Technical field
The invention belongs to solar energy power generating and technical field of energy storage, be specifically related to the communication means of a kind of photovoltaic-energy-storage system and interior data exchange.
Background technology
Because solar energy has the feature such as intermittence, fluctuation, so also there is intermittence and fluctuation in the electric energy that solar photovoltaic generation system exports, for grid-connected photovoltaic system, the energy injecting electrical network is unstable, cause the quality of power supply poor, the deterioration of safety of network system may be caused simultaneously.For photovoltaic off-grid electricity generation system, show as voltage that load obtains or frequency unstable, likely damage power consumption equipment, simultaneously more weak at light, time even dark, photovoltaic cell can not generate electricity, and causes power consumption equipment to have a power failure.Therefore, need certain energy-storage system to carry out stabilizing the fluctuation of photovoltaic generating system, be beneficial to as electrical network or power consumption equipment provide stable electric energy.The system that photovoltaic generating system and energy-storage system combine is called photovoltaic-energy-storage system by the present invention.
For the ease of modularized design, photovoltaic generating system in photovoltaic-energy-storage system and energy-storage system have corresponding control system separately, therefore, between photovoltaic generating system and energy-storage system, energy-storage system inside all needs to carry out exchanges data, to carry out efficient energy compatibility control.The form of exchanges data generally comprises wire communication mode and communication.Because photovoltaic generating system and energy-storage system generally can be installed together, distance is relatively near, simultaneously real-time to exchanges data of photovoltaic-energy-storage system, so usually adopt wire communication mode.Wire communication mode adopts fieldbus form usually, and fieldbus comprises Modbus bus, CAN, Profibus bus etc.Wherein, Modbus bus can support more eurypalynous electric interfaces, such as RS232, RS485, RS422, RJ45, can also transmit on a variety of media, as twisted-pair feeder, optical fiber, less radio-frequency etc.Its frame format is comparatively simple, compact simultaneously, format specification, is easy to transmission, easy-to-understand.
Therefore the communication means needing to provide a kind of photovoltaic-energy-storage system and interior data to exchange controls to realize between photovoltaic generating system in photovoltaic-energy-storage system and energy-storage system energy compatibility efficiently, thus realizes exchanges data.
Summary of the invention
For the deficiencies in the prior art, the object of this invention is to provide the communication means of a kind of photovoltaic-energy-storage system and interior data exchange, solve between photovoltaic generating system and energy-storage system and the inner problem of carrying out exchanges data of energy-storage system, control to realize more efficient energy compatibility.
A kind of photovoltaic-energy-storage system, described photovoltaic-energy-storage system comprises photovoltaic generating system and energy-storage system, described photovoltaic generating system comprises photovoltaic array and photovoltaic inversion device, described energy-storage system comprises the identical energy-accumulating medium of 5 Bidirectional charging-discharging power converter cells and correspondence thereof, described Bidirectional charging-discharging power converter cells is respectively Bidirectional charging-discharging converter 1, 2, 3, 4 and 5, the direct current input anode of 5 described Bidirectional charging-discharging power converter cells and negative terminal are all connected respectively to the positive and negative terminal of this DC bus, the output of described Bidirectional charging-discharging converter 1 connects the energy-accumulating medium of oneself, the output of other 4 Bidirectional charging-discharging power converter cells also connects the energy-accumulating medium of oneself.
Preferably, described energy-accumulating medium is the one in lead acid accumulator, lithium ion battery or ultracapacitor.
Preferably, described photovoltaic-energy-storage system comprises photovoltaic array, load or electrical network and energy-accumulating medium three power port;
When photovoltaic array power output is greater than load or electrical network power demand, unnecessary power output is charged to energy-accumulating medium by Bidirectional charging-discharging power converter cells;
When photovoltaic array power output is less than load or electrical network power demand, the power lacked is supplemented by the generating of Bidirectional charging-discharging power converter cells by energy-accumulating medium;
When photovoltaic array power output equals load or electrical network power demand, energy-accumulating medium does not charge, and does not also discharge.
Preferably, in described 5 Bidirectional charging-discharging power converter cells, described Bidirectional charging-discharging converter 1 is main frame, all the other 4 Bidirectional charging-discharging power converter cells are from machine, described main frame runs to sending from machine described in 4 and ceases and desist order, charge or discharge reference power, from machine to the charge or discharge electric current of the voltage and current of described main frame loopback running status separately, energy-accumulating medium, separately DC bus side described in 4.
The communication means that a kind of photovoltaic-energy-storage system and interior data exchange, described photovoltaic-energy-storage system is said system, and described communication means comprises the following steps:
S1, described photovoltaic generating system is connected by RS485 physical interface with between energy-storage system, the A end of the RS485 communication interface of photovoltaic generating system is held with the A of the RS485_1 communication interface of Bidirectional charging-discharging converter 1,2,3,4,5 and is all linked together, and is A1 end after connecting; The B end of the RS485 communication interface of photovoltaic generating system is held with the B of the RS485_1 communication interface of Bidirectional charging-discharging converter 1,2,3,4,5 and is all linked together, and is B1 end after connecting;
S2,5 Bidirectional charging-discharging power converter cells of described energy-storage system inside carry out physical connection by respective RS485_2 communication interface, the A end of the RS485_2 communication interface of Bidirectional charging-discharging converter 1,2,3,4,5 all links together, and is A2 end after connecting; The B end of the RS485_2 communication interface of Bidirectional charging-discharging converter 1,2,3,4,5 all links together, and is B2 end after connecting;
S3, the physical quantity of described energy-storage system is shown by touch-screen, by carrying out between the RS485_3 communication interface of described Bidirectional charging-discharging converter 1 and the RS485 of described touch-screen, physical connection completes, the A end of the RS485_3 communication interface of described Bidirectional charging-discharging converter 1 is held with the A of the RS485 of described touch-screen and is linked together, and is A3 end after connecting; The B end of the RS485_3 communication interface of described Bidirectional charging-discharging converter 1 is held with the B of the RS485 of described touch-screen and is linked together, and is B3 end after connecting.
Preferably, between described photovoltaic generating system and described energy-storage system, data exchange communications adopts No. 16 functions of Modbus agreement.
Preferably, the data exchange communications between described Bidirectional charging-discharging converter 1 and described Bidirectional charging-discharging converter 2,3,4,5 adopts No. 03 function of Modbus agreement.
Preferably, the data exchange communications between described Bidirectional charging-discharging converter 1 and described touch-screen adopts No. 03 function of Modbus agreement.
Technical scheme of the present invention has following beneficial effect:
The communication means that a kind of photovoltaic-energy-storage system provided by the invention and interior data exchange, the invention solves between photovoltaic generating system and energy-storage system, the Bidirectional charging-discharging converter 1(main frame of energy-storage system inside) and Bidirectional charging-discharging converter 2,3,4,5(is from machine) between and exchanges data problem between Bidirectional charging-discharging converter 1 and touch-screen, Systematical control is understood clear, the cooperation control being conducive to realizing system capacity and the relevant function such as to show, have broad application prospects.
Accompanying drawing explanation
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Fig. 1 is the structural representation of photovoltaic-energy-storage system of the present invention;
Fig. 2 is the communication link map interlinking of photovoltaic of the present invention-energy-storage system internal exchange of data.
Embodiment
In order to have a clear understanding of technical scheme of the present invention, its detailed structure will be proposed in the following description.Obviously, the concrete execution of the embodiment of the present invention also not enough specific details being limited to those skilled in the art and haveing the knack of.The preferred embodiments of the present invention are described in detail as follows, and except these embodiments described in detail, can also have other execution modes.
Below in conjunction with drawings and Examples, the present invention is described in further details.
With reference to Fig. 1, the invention discloses a kind of photovoltaic-energy-storage system, this photovoltaic-energy-storage system is made up of photovoltaic generating system and energy-storage system two parts, and as shown in Figure 1, Fig. 1 is the structural representation of photovoltaic-energy-storage system of the present invention.Photovoltaic generating system is made up of photovoltaic array and photovoltaic inversion device, for load supplying or by energy injection electrical network.Energy-storage system is made up of the identical energy-accumulating medium of 5 Bidirectional charging-discharging power converter cells and correspondence thereof, energy-accumulating medium can be lead acid accumulator, lithium ion battery or ultracapacitor, Bidirectional charging-discharging power converter cells is respectively Bidirectional charging-discharging converter 1, 2, 3, 4, 5, the direct current input anode of 5 Bidirectional charging-discharging power converter cells carries out parallel connection, the photovoltaic array being connected to photovoltaic generating system exports (+) end, the direct current input negative terminal of 5 Bidirectional charging-discharging power converter cells carries out parallel connection, the photovoltaic array being connected to photovoltaic generating system exports (-) end, the photovoltaic array of definition photovoltaic generating system exports the positive and negative terminal that (+) end is DC bus with (-) end, therefore the direct current input anode of 5 Bidirectional charging-discharging power converter cells and negative terminal are all connected respectively to the positive and negative terminal of this DC bus.The output of Bidirectional charging-discharging converter 1 connects the energy-accumulating medium of oneself, and in like manner, the output of other 4 Bidirectional charging-discharging power converter cells also connects the energy-accumulating medium of oneself.
As can be seen here, there are photovoltaic array, load or electrical network, energy-accumulating medium three power port in this photovoltaic-energy-storage system, when photovoltaic array power output is greater than load or electrical network power demand, unnecessary power output is charged to energy-accumulating medium by Bidirectional charging-discharging power converter cells; When photovoltaic array power output is less than load or electrical network power demand, the power lacked is supplemented by the generating of Bidirectional charging-discharging power converter cells by energy-accumulating medium; When photovoltaic array power output equals load or electrical network power demand, energy-accumulating medium does not charge, and does not also discharge.If the main body controlled using energy-storage system as energy compatibility, then photovoltaic generating system needs the data provided to energy-storage system should comprise the running status of photovoltaic generating system, the power output of photovoltaic array, the optimal voltage of photovoltaic array and load or electrical network power demand, had above-mentioned data, energy-storage system successfully can perform the flow of power problem between above-mentioned three power port.
For energy-storage system, it comprises again the energy-accumulating medium of 5 Bidirectional charging-discharging power converter cells and correspondence thereof, no matter energy-storage system charging is still discharged, all require that 5 Bidirectional charging-discharging power converter cells divide equally power, so 5 Bidirectional charging-discharging power converter cells also need swap data, if using Bidirectional charging-discharging converter 1 as main frame, all the other 4 Bidirectional charging-discharging power converter cells are as from machine, then main frame needs to send to 4 from machine to run and cease and desist order, charge or discharge reference power, 4 from machine to the respective running status of main frame loopback, the voltage and current of energy-accumulating medium, the charge or discharge electric current of respective DC bus side.Had above-mentioned data, 5 Bidirectional charging-discharging power converter cells can divide equally power, and main frame can show the physical quantity such as voltage, electric current of 5 Bidirectional charging-discharging power converter cells by touch-screen simultaneously.
Need the data exchanged according to the structure of above-mentioned photovoltaic-energy-storage system and between photovoltaic generating system and energy-storage system and energy-storage system inside, propose corresponding data exchange communications method:
Concrete communication connection mode as shown in Figure 2,1) be connected by RS485 physical interface between photovoltaic generating system with energy-storage system, the A end of the RS485 communication interface of photovoltaic generating system is held with the A of the RS485_1 communication interface of Bidirectional charging-discharging converter 1,2,3,4,5 and is all linked together, and called after A1 holds; The B end of the RS485 communication interface of photovoltaic generating system is held with the B of the RS485_1 communication interface of Bidirectional charging-discharging converter 1,2,3,4,5 and is all linked together, and called after B1 holds.2) 5 Bidirectional charging-discharging power converter cells of energy-storage system inside carry out physical connection by respective RS485_2 communication interface, and the A end of the RS485_2 communication interface of Bidirectional charging-discharging converter 1,2,3,4,5 all links together, and called after A2 holds; The B end of the RS485_2 communication interface of Bidirectional charging-discharging converter 1,2,3,4,5 all links together, and called after B2 holds.3) physical quantity of energy-storage system can be shown by touch-screen, it completes by carrying out physical connection between the RS485_3 communication interface of Bidirectional charging-discharging converter 1 and the RS485 of touch-screen, the A end of the RS485_3 communication interface of Bidirectional charging-discharging converter 1 is held with the A of the RS485 of touch-screen and is linked together, and called after A3 holds; The B end of the RS485_3 communication interface of Bidirectional charging-discharging converter 1 is held with the B of the RS485 of touch-screen and is linked together, and called after B3 holds.
1) communication means of exchanges data between photovoltaic generating system and energy-storage system:
Be physically connected as basis with above-mentioned, photovoltaic generating system is main frame, and 5 Bidirectional charging-discharging power converter cells of energy-storage system are from machine.The communication mode of photovoltaic generating system is broadcast mode, and corresponding station number is 00.The station number of Bidirectional charging-discharging converter 1,2,3,4,5 correspondence is respectively 01,02,03,04,05.Adopt RTU pattern to carry out data transmission, each data comprise 1 start bit and 1 position of rest, communication baud rate 19.2kBPS.Adopt the 16(i.e. 16 system 10H of Modbus agreement) number function, by main frame regularly (such as 10ms) to send the data of 4 words to 5 from machine: the optimal voltage (Vmppt) of the running status (state) of photovoltaic generating system, the power output (Ppv) of photovoltaic array, photovoltaic array and load or electrical network power demand (Po).
Host request sends according to the form of table 1, each information that can receive table 1 from machine, thus makes 5 Bidirectional charging-discharging power converter cells of energy-storage system carry out the controls such as charge or discharge with the form of power-sharing.
Table 1
2) Bidirectional charging-discharging converter 1(main frame) and Bidirectional charging-discharging converter 2,3,4,5(is from machine) between data exchange communications method:
Be physically connected as basis with above-mentioned, Bidirectional charging-discharging converter 1 is main frame, and all the other Bidirectional charging-discharging converters 2,3,4,5 are all from machine.The station number of Bidirectional charging-discharging converter 1,2,3,4,5 correspondence is respectively 01,02,03,04,05.Adopt RTU pattern to carry out data transmission, each data comprise 1 start bit and 1 position of rest, communication baud rate 9600BPS.
Adopt No. 03 function of Modbus agreement, by main frame regular (such as 200ms) from 4 from machine-readable data of getting 4 words: the charge or discharge electric current (Ibus) of the running status (state1) of Bidirectional charging-discharging power converter cells, the voltage (Vbat) of energy-accumulating medium and electric current (Ibat), DC bus input side.
Host request sends according to table 2 form, and wherein 0X represents 02,03,04,05.
Table 2
Each is replied from machine according to table 3, and wherein 0X represents 02,03,04,05.
Table 3
Carry out exchanges data by above-mentioned communication, main frame can obtain each related physical quantity from machine, thus shows.
3) data exchange communications method between Bidirectional charging-discharging converter 1 and touch-screen
Be physically connected as basis with above-mentioned, touch-screen is main frame, and Bidirectional charging-discharging converter 1 is from machine, and its station number is 01.Adopt RTU pattern to carry out data transmission, each data comprise 1 start bit and 1 position of rest, communication baud rate 9600BPS.
Adopt No. 03 function of Modbus agreement, by main frame regularly (such as 2s) from from machine-readable data of getting 17 words: the charge or discharge electric current (Ibus1) of the running status (state2) of DC bus-bar voltage (Vdc), Bidirectional charging-discharging converter 1, the voltage (Vbat1) of energy-accumulating medium and electric current (Ibat1), DC bus input side; The charge or discharge electric current (Ibus2) of the voltage (Vbat2) of the energy-accumulating medium of Bidirectional charging-discharging converter 2 and electric current (Ibat2), DC bus input side; The charge or discharge electric current (Ibus3) of the voltage (Vbat3) of the energy-accumulating medium of Bidirectional charging-discharging converter 3 and electric current (Ibat3), DC bus input side; The charge or discharge electric current (Ibus4) of the voltage (Vbat4) of the energy-accumulating medium of Bidirectional charging-discharging converter 4 and electric current (Ibat4), DC bus input side; The charge or discharge electric current (Ibus5) of the voltage (Vbat5) of the energy-accumulating medium of Bidirectional charging-discharging converter 5 and electric current (Ibat5), DC bus input side.
Host request sends according to table 4 form.
Table 4
Reply from machine according to table 5.
Table 5
By above-mentioned communication process, touch-screen can carry out the display of related physical quantity.
As can be seen here, the invention solves between photovoltaic generating system and energy-storage system, the Bidirectional charging-discharging converter 1(main frame of energy-storage system inside) and Bidirectional charging-discharging converter 2,3,4,5(is from machine) between and exchanges data problem between Bidirectional charging-discharging converter 1 and touch-screen, Systematical control is understood clear, the cooperation control being conducive to realizing system capacity and the relevant function such as to show, have broad application prospects.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; although with reference to above-described embodiment to invention has been detailed description; those of ordinary skill in the field still can modify to the specific embodiment of the present invention or equivalent replacement; these do not depart from any amendment of spirit and scope of the invention or equivalent replacement, are all applying within the claims awaited the reply.
Claims (8)
1. photovoltaic-energy-storage system, it is characterized in that, described photovoltaic-energy-storage system comprises photovoltaic generating system and energy-storage system, described photovoltaic generating system comprises photovoltaic array and photovoltaic inversion device, described energy-storage system comprises the identical energy-accumulating medium of 5 Bidirectional charging-discharging power converter cells and correspondence thereof, described Bidirectional charging-discharging power converter cells is respectively Bidirectional charging-discharging converter 1, 2, 3, 4 and 5, the direct current input anode of 5 described Bidirectional charging-discharging power converter cells and negative terminal are all connected respectively to the positive and negative terminal of this DC bus, the output of described Bidirectional charging-discharging converter 1 connects the energy-accumulating medium of oneself, the output of other 4 Bidirectional charging-discharging power converter cells also connects the energy-accumulating medium of oneself.
2. photovoltaic-energy-storage system according to claim 1, is characterized in that, described energy-accumulating medium is the one in lead acid accumulator, lithium ion battery or ultracapacitor.
3. photovoltaic-energy-storage system according to claim 1, is characterized in that, described photovoltaic-energy-storage system comprises photovoltaic array, load or electrical network and energy-accumulating medium three power port;
When photovoltaic array power output is greater than load or electrical network power demand, unnecessary power output is charged to energy-accumulating medium by Bidirectional charging-discharging power converter cells;
When photovoltaic array power output is less than load or electrical network power demand, the power lacked is supplemented by the generating of Bidirectional charging-discharging power converter cells by energy-accumulating medium;
When photovoltaic array power output equals load or electrical network power demand, energy-accumulating medium does not charge, and does not also discharge.
4. photovoltaic-energy-storage system according to claim 1, it is characterized in that, in described 5 Bidirectional charging-discharging power converter cells, described Bidirectional charging-discharging converter 1 is main frame, all the other 4 Bidirectional charging-discharging power converter cells are from machine, described main frame runs to sending from machine described in 4 and ceases and desist order, charge or discharge reference power, from machine to the charge or discharge electric current of the voltage and current of described main frame loopback running status separately, energy-accumulating medium, separately DC bus side described in 4.
5. a communication means for photovoltaic-energy-storage system and interior data exchange, described photovoltaic-energy-storage system is said system, it is characterized in that, described communication means comprises the following steps:
S1, described photovoltaic generating system is connected by RS485 physical interface with between energy-storage system, the A end of the RS485 communication interface of photovoltaic generating system is held with the A of the RS485_1 communication interface of Bidirectional charging-discharging converter 1,2,3,4,5 and is all linked together, and is A1 end after connecting; The B end of the RS485 communication interface of photovoltaic generating system is held with the B of the RS485_1 communication interface of Bidirectional charging-discharging converter 1,2,3,4,5 and is all linked together, and is B1 end after connecting;
S2,5 Bidirectional charging-discharging power converter cells of described energy-storage system inside carry out physical connection by respective RS485_2 communication interface, the A end of the RS485_2 communication interface of Bidirectional charging-discharging converter 1,2,3,4,5 all links together, and is A2 end after connecting; The B end of the RS485_2 communication interface of Bidirectional charging-discharging converter 1,2,3,4,5 all links together, and is B2 end after connecting;
S3, the physical quantity of described energy-storage system is shown by touch-screen, by carrying out between the RS485_3 communication interface of described Bidirectional charging-discharging converter 1 and the RS485 of described touch-screen, physical connection completes, the A end of the RS485_3 communication interface of described Bidirectional charging-discharging converter 1 is held with the A of the RS485 of described touch-screen and is linked together, and is A3 end after connecting; The B end of the RS485_3 communication interface of described Bidirectional charging-discharging converter 1 is held with the B of the RS485 of described touch-screen and is linked together, and is B3 end after connecting.
6. the communication means of photovoltaic-energy-storage system according to claim 5 and interior data exchange, it is characterized in that, between described photovoltaic generating system and described energy-storage system, data exchange communications adopts No. 16 functions of Modbus agreement.
7. the communication means of photovoltaic-energy-storage system according to claim 5 and interior data exchange, it is characterized in that, the data exchange communications between described Bidirectional charging-discharging converter 1 and described Bidirectional charging-discharging converter 2,3,4,5 adopts No. 03 function of Modbus agreement.
8. the communication means of photovoltaic-energy-storage system according to claim 5 and interior data exchange, it is characterized in that, the data exchange communications between described Bidirectional charging-discharging converter 1 and described touch-screen adopts No. 03 function of Modbus agreement.
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| CN201510989060.5A CN105515208A (en) | 2015-12-28 | 2015-12-28 | Photovoltaic-energy storage system and communication method of internal data exchange of photovoltaic-energy storage system |
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