CN106301201B - Power optimization circuit integrating data communication function and communication method - Google Patents
Power optimization circuit integrating data communication function and communication method Download PDFInfo
- Publication number
- CN106301201B CN106301201B CN201610910811.4A CN201610910811A CN106301201B CN 106301201 B CN106301201 B CN 106301201B CN 201610910811 A CN201610910811 A CN 201610910811A CN 106301201 B CN106301201 B CN 106301201B
- Authority
- CN
- China
- Prior art keywords
- circuit
- stage
- buck
- buck circuit
- output
- 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.)
- Active
Links
- 238000005457 optimization Methods 0.000 title claims abstract description 88
- 238000004891 communication Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims description 48
- 230000005284 excitation Effects 0.000 claims description 42
- 239000003990 capacitor Substances 0.000 claims description 29
- 238000006243 chemical reaction Methods 0.000 claims description 24
- 238000012544 monitoring process Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000009191 jumping Effects 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 2
- 102100022501 Receptor-interacting serine/threonine-protein kinase 1 Human genes 0.000 description 11
- 101150014715 CAP2 gene Proteins 0.000 description 4
- 101100326803 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) fac-2 gene Proteins 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 101150077194 CAP1 gene Proteins 0.000 description 3
- 101100438378 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) fac-1 gene Proteins 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 101001109137 Homo sapiens Receptor-interacting serine/threonine-protein kinase 2 Proteins 0.000 description 2
- 101710138589 Receptor-interacting serine/threonine-protein kinase 1 Proteins 0.000 description 2
- 102100022502 Receptor-interacting serine/threonine-protein kinase 2 Human genes 0.000 description 2
- 102100033729 Receptor-interacting serine/threonine-protein kinase 3 Human genes 0.000 description 2
- 101710138585 Receptor-interacting serine/threonine-protein kinase 3 Proteins 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 101100295841 Arabidopsis thaliana OPT3 gene Proteins 0.000 description 1
- 101100189913 Caenorhabditis elegans pept-1 gene Proteins 0.000 description 1
- 101000643956 Homo sapiens Cytochrome b-c1 complex subunit Rieske, mitochondrial Proteins 0.000 description 1
- 101001099199 Homo sapiens RalA-binding protein 1 Proteins 0.000 description 1
- 101001109145 Homo sapiens Receptor-interacting serine/threonine-protein kinase 1 Proteins 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 101150071218 cap3 gene Proteins 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000008733 trauma Effects 0.000 description 1
Images
Classifications
-
- 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
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/66—Regulating electric power
- G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
-
- H02J3/385—
-
- 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
Abstract
The invention mainly relates to a power optimization circuit integrating a data communication function and a communication method, in particular to a scheme that the power optimization circuit is used in each photovoltaic assembly, and the power optimization circuit can send data outwards in a carrier signal mode, so that each photovoltaic CELL string CELL in each photovoltaic assembly is correspondingly tracked by a BUCK circuit to execute maximum power tracking, and the optimization of the output power of the whole photovoltaic assembly and the communication of the data are ensured. The power optimization circuit employs a multi-stage BUCK circuit that can operate in either a first operating mode of MPPT in which data is not transmitted or in first and second operating modes in which data is transmitted.
Description
Technical Field
The invention mainly relates to a photovoltaic power generation electric device, in particular to a scheme that a multi-stage power optimization circuit is used in each photovoltaic assembly, and the power optimization circuit can transmit data outwards in a carrier signal mode, so that each photovoltaic cell string in each photovoltaic assembly is correspondingly subjected to maximum power tracking by one power optimization circuit, and the optimization of the output power of the whole photovoltaic assembly is ensured and the data communication is realized.
Background
In the current energy industry, with the shortage of traditional chemical energy and the development of scientific technology, new energy is more and more widely applied, and due to the characteristics of high safety degree, low operation expenditure, simple maintenance, availability anywhere and the like of photovoltaic power generation, the photovoltaic power generation is rapidly developed in the world, and particularly plays an indispensable role in solving the power utilization problem of countries or regions with energy shortage. In terms of physical characteristics, the output curve of the photovoltaic cell is greatly changed under the influence of external environmental factors such as external temperature, illumination radiation intensity and the like. In order to enable the photovoltaic cell to always output the maximum power so that we can use solar energy more efficiently in the industry, the most common and important solution is to find the maximum power point of the photovoltaic cell, keeping the output voltage and the output current of the panel at this desired maximum power point. In fact, the change of the maximum power point is generally closely related to the irradiation intensity, the ambient temperature, and other factors, so the difficult problem to be solved is that when the external environment of the solar panel changes or there is a difference between the modules/battery strings, the difference factors between the external environment and the modules/battery strings can be screened by dynamically tracking the parameter changes, and the photovoltaic module is ensured to work at the maximum power point.
In current photovoltaic power optimization approaches, optimization is almost always performed at the photovoltaic module level, which is generally an optimization module to optimize one or more photovoltaic modules, but in practice each photovoltaic module will usually comprise a plurality of strings of cells connected in series by cells, and according to the prior art, optimization at the photovoltaic module level means that each individual string of cells is not individually optimized. When the consistency of single batteries of the same string of batteries is poor due to problems of manufacturing processes and the like, or when partial batteries cannot normally generate power due to external shadow shielding events such as dirt, cloud layers and the like, the efficiency loss of the whole string of photovoltaic batteries is serious, and when the number of connected photovoltaic module arrays of inverters, particularly centralized inverters is large, the battery panels of all strings of batteries cannot operate at the maximum power point of the inverters, so that the great loss of generated power is caused under the conditions, and the generation of the photovoltaic modules is avoided.
The power optimization circuit described in the following of the present application mainly solves or alleviates these problems, and implements power optimization at a string level rather than a module level to perform active power optimization for each photovoltaic string, and introduces maximum power point tracking to ensure maximum power optimization for each photovoltaic module. In addition, monitoring of working parameters of photovoltaic modules is an important link, in a large photovoltaic power station or a distributed power station, criteria for evaluating the quality of each photovoltaic module refer to parameters of the photovoltaic module, such as voltage, current, power, temperature and the like, and how to capture the parameters of the photovoltaic modules and reliably send the parameters from the module side to achieve communication is also one of the problems to be solved.
Disclosure of Invention
The invention provides a power optimization circuit integrating a data communication function, which is used for implementing power optimization for a photovoltaic module, wherein the power optimization circuit is provided with BUCK circuits the number of which is consistent with that of battery strings of the photovoltaic module;
any stage of BUCK circuit executes MPPT calculation on the voltage received from a battery string and performs BUCK conversion to output the voltage on an output capacitor of the BUCK circuit, the output capacitors of the BUCK circuits of the power optimization circuit are connected in series, and the total output voltage of the power optimization circuit is provided by the voltage superposed on the output capacitors connected in series;
at least one BUCK circuit is provided with a change-over switch, and an output capacitor of any one stage of BUCK circuit with the change-over switch is correspondingly connected with the change-over switch in series;
when the change-over switch of any stage of BUCK circuit with the change-over switch is switched on, the BUCK circuit of any stage is in a first working mode that the voltage received by the BUCK circuit of any stage is subjected to voltage reduction conversion and output;
when the switch of any stage of BUCK circuit with the switch is turned off, the BUCK circuit of any stage is in a second working mode of coupling excitation pulses jumping between high and low levels to a transmission line connected with an output capacitor of the BUCK circuit in series as a carrier signal, wherein the excitation pulses are derived from: the pulse width modulation signal driving the BUCK circuit at this stage forces the voltage output by the BUCK circuit of any stage to undergo a step change with the frequency of the pulse width modulation signal and thereby act as an excitation pulse.
In the above power optimization circuit, each stage of the BUCK circuit includes first and second input terminals connected to the positive and negative electrodes of a battery string, and further includes a main switch and an inductor connected between the first input terminal and a first output node thereof, and both the main switch and the inductor are connected to an interconnection node; and
a freewheeling switch or a freewheeling diode is connected between the interconnection node and the second input terminal, wherein the second input terminal and the second output node of each stage of the BUCK circuit are coupled together.
In the power optimization circuit, in any one stage of the BUCK circuit provided with the change-over switch, the change-over switch and the output capacitor are connected in series between the first output node and the second output node of the BUCK circuit.
In the power optimization circuit, the multistage BUCK circuits are connected in series in the following manner: the first output node of any back stage BUCK circuit is connected with the second output node of the front stage BUCK circuit adjacent to the first output node, and the total output voltage is provided between the first output node of the first stage BUCK circuit and the second output node of the last stage BUCK circuit.
In the power optimization circuit, each pulse width modulation signal output by one control module drives each stage of BUCK circuit to execute MPPT calculation, wherein when any stage of BUCK circuit with a switch is in the second working mode: the control module drives the change-over switch of the BUCK circuit of any stage to be switched off, and simultaneously the control module also generates a pulse width modulation signal to drive the BUCK circuit of any stage to be clamped in a state of outputting an excitation pulse.
In the power optimization circuit, the mode of sending data to the transmission line by the control module is as follows: controlling any stage of BUCK circuit with a change-over switch to be in a first working mode or to be in a second working mode at least once in each period of a preset time period; wherein
When the transmission line is loaded with the excitation pulse in each period, a binary code element representing data transmitted to the transmission line by the control module is one of 1 or 0;
and the binary code element which is used for representing the data transmitted to the transmission line by the control module when the transmission line is not loaded with any excitation pulse in each period is the other one of 1 or 0.
In the above power optimization circuit, the data at least includes the current and voltage (which may also include the corresponding calculated power) of each cell string in the photovoltaic module PV, and the data further includes the operating parameters such as the voltage and temperature (which may also include the corresponding calculated power) of each single cell panel in each cell string in each photovoltaic module PV.
In another embodiment, the present application further discloses a communication method according to the above power optimization circuit:
at the stage that a control module for driving the BUCK circuit to execute MPPT operation does not send data, the control module controls a change-over switch of the BUCK circuit with the change-over switch to be continuously kept on, so that the BUCK circuit works in a first working mode;
in a time period when the control module sends data by utilizing a carrier signal, the control module controls a change-over switch of the BUCK circuit with the change-over switch to be always switched on in any period of the time period, so that the BUCK circuit enters a first working mode in the period without outputting excitation pulses; or
In the time period that the control module utilizes the carrier signal to send data, the change-over switch of the BUCK circuit with the change-over switch is controlled to be turned off at least once in any period of the time period, so that the BUCK circuit at least enters a second working mode once in the period and outputs the excitation pulse not lower than a cluster.
In the above communication method, in the time period when the control module transmits data using the carrier signal:
when the transmission line is loaded with the excitation pulse in each period, a binary code element representing data transmitted to the transmission line by the control module is one of 1 or 0;
and the binary code element which is used for representing the data transmitted to the transmission line by the control module when the transmission line is not loaded with any excitation pulse in each period is the other one of 1 or 0.
In the above communication method, the carrier signal is decoded by: a sensor is used for monitoring carrier signals on a transmission line, and a band-pass filter is used for extracting carrier signals with specified frequency range and carrying data from the carrier signals sensed by the sensor.
In the disclosure, one of the functions of the power optimization circuit is to directly track the maximum power point of the power optimization of the battery strings in real time, and the other function is to send data outwards in a manner of sending carrier signals, so that each photovoltaic battery string CELL in each photovoltaic module PV is correspondingly subjected to MPPT by one power optimization circuit, so as to ensure the optimization of the output power of the whole photovoltaic module and realize the communication of data, and the current, voltage, power of each battery string CELL in the photovoltaic module and the temperature condition of the whole photovoltaic module PV can be timely sent out from the module side and monitored.
Drawings
The features and advantages of the present invention will become apparent upon reading the following detailed description and upon reference to the following drawings:
fig. 1 is a schematic diagram of an exemplary application of the power optimization circuit of the present invention.
Fig. 2 is a basic architecture of a single photovoltaic module containing multiple strings of photovoltaic cells.
Fig. 3 is a schematic diagram of the series connection of the output capacitance and the switch of the power optimization circuit.
Fig. 4 is a first mode of operation in which the power optimization circuit performs MPPT to output a regulated voltage.
Fig. 5 is a second mode of operation in which the power optimization circuit outputs excitation pulses during the communication phase.
Fig. 6 is a schematic diagram of the combined use of multiple power optimization circuits in a single photovoltaic module.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to various embodiments, but the described embodiments are only used for describing and illustrating the present invention and not for describing all embodiments, and the solutions obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.
Referring to fig. 1 and 2, the inventive spirit of the present invention is illustrated by taking as an example the CELL strings CELL-1 to CELL-3 arranged on each of the photovoltaic modules PV1 to PVM, it being noted that the natural number M of photovoltaic modules greater than 1 and the number 3 of CELL strings arranged thereon are merely for convenience of description and do not represent that the present invention is limited only to the specific numbers listed. Referring to fig. 2, the CELL string CELL-1 has a plurality of photovoltaic CELLs 10 connected in series, the photovoltaic CELL 10 is the most basic single CELL panel with PN junction, the photovoltaic CELLs 10 are connected in series in a way that the anode of the next photovoltaic CELL 10 is connected to the cathode of the adjacent previous photovoltaic CELL 10, the anode of the first photovoltaic CELL 10 in the series of CELLs of the CELL string CELL-1 is set as the equivalent anode a1 of the whole CELL string CELL-1, and the cathode of the last photovoltaic CELL 10 in the series of CELLs of the CELL string CELL-1 is set as the equivalent cathode C1 of the whole CELL string CELL-1. CELL string CELL-2 also has equivalent anode a2 and equivalent cathode C2, and CELL string CELL-3 has equivalent anode A3 and equivalent cathode C3, according to the same principles as described above. In the conventional layout mode of each photovoltaic module, the equivalent cathode C1 of the CELL string CELL-1 is connected with the equivalent anode A2 of the CELL string CELL-2, and the equivalent cathode C2 of the CELL string CELL-2 is connected with the equivalent anode A3 of the CELL string CELL-3. Looking at each photovoltaic module as a whole, the equivalent anode a1 of the CELL string CELL-1 is considered to be the positive terminal ANO of the photovoltaic module for connection to an external circuit, and the equivalent cathode C3 of the CELL string CELL-3 is considered to be the negative terminal CAT of the photovoltaic module for connection to an external circuit.
Referring to fig. 1, in order to avoid the situation that the entire photovoltaic module cannot work normally due to damage or other abnormal conditions of the PN junction single CELL in any CELL string CELL, a diode D1 is further connected between the equivalent anode a1 and the equivalent cathode C1 of the CELL string CELL-1, the anode of the diode D1 is connected to the equivalent cathode C1, and the cathode is connected to the equivalent anode a1, so that the diode D1 is reversely biased. Similarly, diode D2 has its anode connected to equivalent cathode C2 and its cathode connected to equivalent anode a2, and diode D3 has its anode connected to equivalent cathode C3 and its cathode connected to equivalent anode A3. When the CELL strings CELL-1 to CELL-3 are operating normally, the diodes D1 to D3 are reverse biased, but when some of the single photovoltaic CELLs 10 in the three CELL strings are damaged by physical trauma or are shaded, so-called hot spot effect occurs in the whole CELL string CELL, and the affected single photovoltaic CELLs 10 may be placed in a reverse biased (reversed biased) state and consume power and cause self overheating. If the diodes D1-D3 are adopted, most of current flows through the diodes which are connected with the battery string CELL in parallel for the shielded battery string CELL, and the application of the diodes can obviously reduce the temperature of the hot spot battery string and prevent the whole photovoltaic module from being damaged and scrapped.
The efficiency of photovoltaic cells is mainly affected by two aspects: the first is the internal characteristics of the photovoltaic cell; the second is the ambient use environment of the photovoltaic cell, such as solar irradiance, load conditions, and temperature conditions. Under different ambient conditions, the photovoltaic cell can operate at different and unique maximum power points. Therefore, for a power generation system of a photovoltaic cell, the real-time optimal working state of the photovoltaic cell under any illumination condition should be sought so as to convert the light energy into electric energy to the maximum extent. For the photovoltaic module shown in fig. 1, when optimizing and tracking the maximum power point of the photovoltaic cell, the current technical means optimizes the output voltage and the output current of a certain photovoltaic module as a whole, calculates the output power, and realizes tracking of the maximum power point. The drawbacks of this optimization scheme are: only the output of the whole photovoltaic module is considered to be optimized, but the optimization is not carried out on the single battery strings, but more practically, the voltage levels output by the battery strings CELL-1 to CELL-3 under the same illumination condition are not necessarily completely the same due to the photovoltaic characteristic difference between the battery strings CELL-1 to CELL-3, and the maximum power point tracking of the whole photovoltaic module PVM is not necessarily an ideal power output state. In the following, the present application will try to overcome the problems existing in the prior art, and introduce how to perform independent optimization of CELL string level for CELL-1, CELL-2 or CELL-3, so as to replace the optimization of PV level in the prior art, and realize the maximum conversion of light energy into electric energy.
Referring to fig. 1, the first CELL string CELL-1 utilizes a first BUCK conversion circuit BUCK1 to produce the desired voltage output. Referring to fig. 3, an inductor L and a capacitor cap1 in the BUCK1 circuit form a low-pass filter, a first input node of the BUCK1 circuit is connected to an equivalent anode a1 of the CELL string CELL-1, a second input node of the BUCK1 circuit is connected to an equivalent cathode C1 of the CELL-1, and a switch S11 and the inductor L are connected in series to a first input node and a first output node B1 of the BUCK1 circuitN1In the meantime. One terminal of switch S11 is connected to a first input node of the BUCK1 circuit, but the opposite terminal of switch S11 (which is coupled to the interconnection node N)XAt) and a second input node of the BUCK1 circuit coupled to a second output node B1, another switch S12 is connected between the second input node and the second input node of the BUCK1 circuitN2The switch S12 may also be replaced by a freewheeling diode. A capacitor cap1 and a switch S13 are connected in series at a first output node B1 of the BUCK1 circuitN1And a second output node B1N2And (3) removing the solvent. The basic principle of the conversion circuit is as follows: the first and second input terminals of BUCK1 circuit are connected to DC voltage source from between anode and cathode of the first CELL string CELL-1, and the pulse width modulation signal PWM generated by the MPPT operation control module is respectively coupled to the control terminals of the main switch S11 and the freewheeling switch S12, and during the MPPT switching period of the BUCK circuit BUCK, the switching is required to be performedThe switch S13 is switched on, the modulation signal PWM enables the main switch S11 to be switched on and turns off the follow current switch S12, and the current of the inductor L is increased and charges the capacitor cap 1; the modulation signal PWM also causes the main switch S11 to turn off and turn on the freewheel switch S12, the current of the inductor L decreases and begins to discharge energy, at which time the freewheel switch S12 is turned on for freewheeling, which is the basic principle of the BUCK-type voltage conversion circuit. When the BUCK1 circuit performs the MPPT optimization operation, S11 and S12 are periodically turned on alternately with the pulse width modulation signal PWM. In an alternative embodiment, the PWM signal may be used as long as the on and off states of the main switch S11 are controlled when the switch S12 is replaced by a freewheeling diode. Referring to fig. 3, the main switch S11 and the inductor L are both connected at an interconnection node NXIf the freewheel switch S12 is replaced by a freewheel diode, the anode of the freewheel diode is connected to the second input node and the cathode of the freewheel diode is connected to the interconnection node NXTo (3).
Referring to FIG. 6, in a more representative illustration, it can be considered that: firstly, a certain photovoltaic module is assumed to be provided with N photovoltaic CELL strings, N is a natural number which is more than or equal to 1, the Nth CELL string CELL-N utilizes an Nth buck conversion circuit BUCKN to generate expected voltage output, and an inductor LN and a capacitor capN in the Nth buck conversion circuit form a low-pass filter. The first input node of the Nth BUCKN circuit is connected to the equivalent anode AN of the Nth CELL string CELL-N, the second input node of the Nth BUCKN circuit is connected to the equivalent cathode CN of the Nth CELL-N, and the switch SN1 and the inductor LN are connected in series between the first input node and the first output node BN of the BUCKN circuitN1In the meantime. Wherein one terminal of switch SN1 is coupled to a first input node of an Nth BUCKN circuit, while the opposite terminal of switch SN1 (which is coupled to interconnect node N)XAt) and a first output node BNN1An inductor LN is connected between and the opposite end of the switch SN1 and the second input node (or the second output node BN) of the nth buck circuitN2) There is also another switch SN2 connected between. A capacitor capN and a switch SN3 are connected in series at the first output node BN of the Nth BUCKN circuitN1And a second output node BNN2In the meantime. One of the switches SN1 and SN2 is connectedThe other is turned off when on. The switch SN3 is optional in the buck, and the switch SN3 must be provided if the buck circuit has a buck conversion function and also has a function of transmitting a carrier, but there is no need to provide any switch SN3 if the buck circuit is merely an ordinary buck conversion circuit. Fig. 1 and 6 illustrate the number N equal to three, but the actual number of N is not limited to this number.
Referring to fig. 6, the optimization circuit includes at least one control module 110 with an MCU in addition to the N-stage BUCK circuit, for example, the first battery string CELL-1 and the corresponding first stage BUCK1 circuit, the pulse width modulation signal PWM sent by the control module 110 drives the switch S11 and the switch S12 to switch between off and on, and the control module 110 modulates the duty ratio of each of the switches S11 and S12 to achieve maximum power point tracking MPPT. Note that Maximum Power Tracking Maximum Power Point Tracking is a mature technology in the industry, and the Maximum Power Tracking common in the prior art includes a constant voltage method, a conductance increment method, a disturbance observation method, and the like.
Referring to fig. 6, the photovoltaic optimization circuit of the present application can be summarized as follows: in a circuit for implementing power optimization on an N-level CELL string CELL of a certain photovoltaic module corresponding to an N-level BUCK circuit, any K-level BUCK circuit comprises an inductor L for low-pass filteringKAnd a capacitor CAPKThe natural number K satisfies N ≧ K > 1, and the capacitance CAP of any K-th stage BUCK circuitKA first output node BK connected to the K-th stage BUCK circuitN1And a second output node BKN2In the meantime. The voltage source of the direct current provided by the K-th stage battery string CELL-K corresponds to MPPT performed by a K-th stage BUCK circuit whose output voltage VOUT-K is derived from a first output node BKN1And a second output node BKN2And output the data. And a first output node BK of any subsequent stage BUCK circuit is providedN1And a second output node B (K-1) of the previous stage BUCK circuit adjacent theretoN2Are connected so that we can be at the first output node B1 of the first stage BUCK circuitN1And a second output node BN of a last Nth stage BUCK circuit at the endN2Generating and providing the total output voltage [ VOUT-1 ] of the CELL strings CELL-1 to CELL-N with N stages in total]+[VOUT-2]+[VOUT-3]. Note that here the total number of photovoltaic cell strings in any one photovoltaic module is substantially equal to the total number of BUCK circuits in one power optimization circuit. In any power optimization circuit, the first output node B1 of its first stage BUCK1 circuitN1Viewed as a positive terminal OUT1 of the power optimization circuit, and, correspondingly, a second output node BN of the last nth stage buck circuit thereofN2Viewed as a negative terminal OUT2 of the power optimization circuit, the total output voltage of the power optimization circuit is equal to the voltage between the positive terminal OUT1 and the negative terminal OUT 2.
Referring to fig. 1, the first output node B1 of the first-stage BUCK1 circuit of the first-stage power optimization circuit OPT1 among the serially connected OPT1 to OPT is viewed from the outside of the serially connected photovoltaic modules (PV1 to PVM) on which the M-stage power optimization circuits (OPT1 to OPT) are mounted in totalN1The connected positive terminal OUT1 serves as a voltage output port of the entire series power optimization circuit OPT1 OPTM and the second output node BN of the last Nth stage BUCK circuit of the last Mth stage optimization circuit OPTM in the OPT1 OPTMN2And the connected negative terminal OUT2 is used as the other voltage output port of the series power optimization circuits OPT1 OPTM.
In the field of photovoltaic inversion, a direct current voltage generated by a photovoltaic module needs to be converted into an alternating current to realize grid connection, a photovoltaic inverter is used for converting direct current electric energy provided by a solar cell into alternating current electric energy so as to meet the requirements of alternating current load or equipment power supply and grid connection, the inverter generally has a single-phase or three-phase or even most equal inversion mode, in fig. 1, a multi-stage power optimization circuit OPT 1-OPT is connected in series, and the voltages provided by the multi-stage power optimization circuit OPT 1-OPT are superposed together to provide direct current for the inverter 180. In FIG. 1, the positive terminal OUT1 of the first stage power optimization circuit OPT1 including the voltage conversion circuits BUCK 1-3 (the three BUCKs 1-3 are used for power optimization of the three CELL strings CELL-1-3 of the module PV1 one-to-one), respectively, is used for coupling to the capacitor C in the inverter 180DCThe negative terminal OUT2 of the first stage power optimization circuit OPT1 is connected to the positive terminal OUT1 of the second stage power optimization circuit OPT 2. Includes voltage conversion circuits BUCK 1-3Three BUCKs 1-3 are respectively used for carrying OUT power optimization on three battery strings CELL-1-3 of the assembly PV 2) one by one, the negative terminal OUT2 of the second-stage power optimization circuit OPT2 is connected to the positive terminal OUT1 of the third-stage power optimization circuit OPT3, and so on, the negative terminal OUT2 of the previous-stage power optimization circuit is connected to the positive terminal OUT1 of the next-stage power optimization circuit, and the negative terminal OUT2 of the M-stage power optimization circuit OPTM including the voltage conversion circuits BUCK 1-3 (the three BUCKs 1-3 are respectively used for carrying OUT power optimization on the three battery strings CELL-1-3 of the assembly PVM) is used for being coupled to a capacitor C-1-3 in the inverter 180DCThe second end of (a). For the sake of simple explanation of the function of the inverter, fig. 1 exemplarily shows a three-phase full-bridge main power converting circuit 170 (which may be a single-phase or two-phase or multi-phase), and the conventional EMC filter used in the previous stage and the three-phase LC filter used in the next stage of the three-phase full-bridge main power converting circuit 170 are not repeated, and the converting circuit 170 may use the capacitor C in the inverterDCThe stored dc voltage is converted into ac power, wherein the switching tubes of the converter circuit 170, which form an inverter bridge, are driven and controlled by an inverter pulse width signal PWM sent from a controller of the inverter. Since the inverter circuit 170 is used to convert dc power to ac power, alternative types are known to those skilled in the art and will not be described in detail.
Referring to fig. 3 and 6, any one stage BUCK circuit performs MPPT calculation on the voltage received from a battery string and performs BUCK conversion output on an output capacitor thereof, such as: the BUCK1 circuit performs MPPT operation and down-conversion output on its output capacitance cap1 from the voltage received by the CELL string CELL-1, the BUCK2 circuit performs MPPT operation and down-conversion output on its output capacitance cap2 from the voltage received by the CELL string CELL-2, and the BUCK3 circuit performs MPPT operation and down-conversion output on its output capacitance cap3 from the voltage received by the CELL string CELL-3. Output capacitors cap 1-cap 3 of BUCK 1-3 circuits of the power optimization circuit are connected in series, and in the specific description, the output capacitors cap 1-cap 3 are connected in series in an OPT at the headFirst output node B1 of BUCK1 circuitN1And a second output node B3 of the last stage BUCK3 circuitN2The total output voltage of the power optimization circuit OPT is provided by the voltage superposed on the series-connected output capacitors cap 1-cap 3.
Referring to FIG. 6, in the power optimization circuit OPT1, a switch S23 is provided in at least one BUCK circuit (e.g. BUCK2), and the output capacitor cap2 of any one stage of BUCK2 circuit with the switch S23 and the switch S23 thereof are connected in series to the first output node B2 of BUCK2N1And a second output node B2N2In the meantime. A switch like S23 may also be provided in the BUCK1 or BUCK3 circuit of the power optimization circuit OPT1, but of course, a switch is not necessarily provided in the BUCK1 or BUCK3, because a switch needs to be provided for the BUCK circuit only when the BUCK circuit is required to have a function of transmitting a carrier.
Referring to FIG. 6, when the switch S23 of any stage BUCK2 circuit with switch S23 is turned on, the BUCK2 circuit is in the first operation mode of converting the voltage received by the circuit (provided by CELL-2) to a BUCK conversion output, i.e. the MPPT mode is executed, while the BUCK2 is a conventional standard BUCK BUCK conversion circuit, showing the BUCK conversion characteristic, and the output capacitor cap2 is connected to the first output node B2 by the connected switch S23N1And a second output node B2N2At this stage, BUCK1 entering the first operation mode is at the first output node B2N1And a second output node B2N2The output dc output voltage VOUT is relatively stable, and although the output voltage VOUT has ripples as shown in fig. 4, the output voltage VOUT is substantially stable at the upper limit VUPPERAnd a lower limit value VLOWERIn between, that is, the maximum ripple amplitude of the output voltage VOUT does not exceed VUPPERMinimum ripple amplitude not less than VLOWER。
Referring to FIG. 6, when any one of the stages of BUCK2 circuit with the switch S23 is turned off at its switch S23, the any one of the stages of BUCK2 circuit is in the second operation mode: i.e. BUCK2 circuitThe excitation pulse RIP jumping between high and low levels is coupled to the transmission lines LIN which are respectively connected with the output capacitors cap 1-cap 3 of the BUCK 1-3 circuits in series, and the excitation pulse RIP is broadcast on the transmission lines LIN as a carrier signal, so that the BUCK2 circuit does not show the characteristics of a standard BUCK circuit any more. In the second operating mode, its output capacitor cap2 is switched off by the switch S23 from the first output node B2N1And a second output node B2N2Is disconnected, BUCK2 is no longer a conventional BUCK conversion circuit, and thus BUCK2 is at the first output node B2N1And a second output node B2N2The output voltage VOUT outputted in between is no longer as smooth as in fig. 4, but is stepped with the frequency of the pulse width modulation signal PWM. The transition of the output voltage VOUT is caused by the interconnection node N in FIG. 3XThe voltage at (1) jumps with the frequency of the PWM, which causes the output voltage VOUT to jump greatly between high and low levels, the high level is close to the voltage intensity of the battery string CELL-2, and the low level is close to zero. We consider the excitation pulse RIP to originate from: in the phase of this second operation mode, which is originally the PWM signal PWM driving the BUCK circuit, the voltage VOUT output by the BUCK2 circuit of any stage is forced to have a step change with the frequency of the PWM signal PWM and we therefore regard the jumped output voltage VOUT as an excitation pulse, which is a carrier wave source.
Referring to fig. 5 and 6, each PWM signal output by one control module 110 drives each BUCK 1-3 circuit to perform MPPT calculation. Wherein when any stage BUCK2 circuit with the switch S23 is in the second working mode: the control module 110 drives the switch S23 of the BUCK2 circuit of any stage to turn off, and the control module 110 also generates the PWM signal PWM to drive the BUCK2 circuit of any stage to be clamped in the state of outputting the excitation pulse RIP, i.e. the switches S21 and S22 are still PWM driven to turn on and off alternately. The way in which the control module 110 sends the DATA onto the transmission line LIN is: any stage of BUCK2 circuit with the switch S23 is controlled to make the switch S23 in a preset time period TPREThe inner is turned off or turned on,off means sending byte 1 (or 0) and on means sending byte 0 (or 1), in particular during the time period TPREThe BUCK2 circuit is required to be in the first mode of operation or to be in the second mode of operation at least once during each cycle of the range (the period in which the control module 110 sends data). For example, it is required to maintain the time period TPREThe second operation mode occurs once in the BUCK2 circuit in the first data transmission period T1, and the first operation mode still exists in the BUCK2 circuit in the first period T1; required in the time period TPREThe BUCK2 circuit is always in the first operating mode during the second data transmission period T2, it must be emphasized that the BUCK2 circuit does not have the second operating mode during the second period T2; required in the time period TPREThe second operation mode occurs one or more times in the BUCK2 circuit in the third data transmission period T3, and the first operation mode also exists in the BUCK2 in the third period T3. And so on in accordance with this basic principle, during the time period TPREThere may also be a plurality of such data transmission periods, but the content of the present application is not described in detail, and each period may implement transmission of one binary symbol 1 or 0.
Referring to fig. 5, a second operation mode occurs only once in the BUCK2 circuit during the first DATA transmission period T1, but the cycle T1, except for the second operation mode, is the first operation mode in which BUCK2 operates, so that the output voltage VOUT of the BUCK2 circuit is caused to generate an excitation pulse RIP-1 corresponding to the second operation mode stage once in T1, and the binary symbol representing the DATA written or transmitted by the control module 110 onto the transmission line LIN is 1 (or conversely 0) when the transmission line LIN is loaded with the excitation pulse RIP-1 during the first period T1.
Referring to fig. 5, the second operation mode of the BUCK2 circuit does not occur during the second DATA transmission period T2, so that the output voltage VOUT of the BUCK2 circuit is caused to generate no excitation pulse during the period T2, and when no excitation pulse is applied to the transmission line LIN during the period T2, the binary symbol representing the DATA written or transmitted on the transmission line LIN by the control module 110 is 0 (or 1, conversely).
Referring to fig. 5, the second operation mode occurs at least twice or more in the BUCK2 circuit during the third DATA transmission period T3, thus causing the output voltage VOUT of the BUCK2 circuit to generate the first and second excitation pulses RIP-2 and RIP-3 or even more in the T3, and the binary symbol representing the DATA written or transmitted by the control module 110 to the LIN transmission line is 1 (or the opposite 0) when the LIN is loaded with the excitation pulses RIP-2 and RIP-3 in the third period T3.
Referring to fig. 5, in three consecutive periods T1 to T3 or more, it is considered that 1 (or 0) is written to the transmission line LIN if an excitation pulse occurs on the transmission line LIN, and conversely, it is considered that 0 (or 1) is written to the transmission line LIN if no excitation pulse occurs on the transmission line LIN, so the control module 110 delivers three consecutive bytes [101 ] to the transmission line LIN in the periods T1 to T3]Or [010]. It is noted that the positive amplitude of the excitation pulse RIP is greater than the upper limit value VUPPERAnd its negative amplitude is lower than lower limit value VLOWERThe excitation pulse RIP is easily captured from the stable plateau voltage VOUT from the transmission line LIN. In a preferred but optional alternative embodiment, the time period TPREThe first start byte delivered during the first period T1 is preferably represented by the presence of at least one stimulus pulse, which is clearly distinguishable from VOUT being steady, so that the start byte can also represent that communication for transferring data has begun by the presence of the second mode of operation, rather than being maintained in the first mode of operation at all times. The first byte may also be considered as a start bit only when defining the communication protocol, from which the data following the start bit is the real data.
Referring to fig. 5 to 6, the communication method for the control module 110 to transmit data is implemented as follows: in the stage that the control module 110 for driving the BUCK 1-3 circuits to execute the MPPT operation does not send data, the control module 110 controls the BUCK1 and the BUCK3 with or without the change-over switches to work in a normal MPPT first working state, and the control module 110 also controls the change-over switch S23 of the BUCK2 circuit with the change-over switches to be continuously kept on, so that the BUCK2 circuit also works in a normal first working mode and executes normal maximum power tracking.
Referring to fig. 5 to 6, the communication method for the control module 110 to transmit data is implemented as follows: in the time period T in which the control module 110 transmits binary data 0 (or 1) using the carrier signalPREThe control module 110 controls the switch S23 of the BUCK2 circuit with the switch during the time period TPREIs always on during any one period (e.g., T2) to make the BUCK2 circuit enter the first operation mode without outputting any type of excitation pulse during the period, so that the output symbol is 0 (or 1), and the phase control module 110 can control the BUCK1 and the BUCK3 with or without switches to operate in the normal MPPT first operation state, at which time the switches should preferably be on if any, of the other respective BUCK circuits (e.g., BUCK1 or 3) except for the BUCK 2.
Referring to fig. 5 to 6, the communication method for the control module 110 to transmit data is implemented as follows: in the time period T in which the control module 110 transmits binary data 1 (or 0) using the carrier signalPREThe control module 110 controls the switch S23 of the BUCK2 circuit with the switch during the time period TPREAt least once in any period (e.g., T1 or T3), so that the BUCK2 circuit enters the second operation mode at least once in the period (e.g., T1 or T3) and outputs not less than one cluster of the excitation pulses (e.g., RIP1 or RIP 2-3), so that the output symbol is 1 (or 0), and the stage control module 110 can control the BUCK1 and the BUCK3 with or without the switch to operate in the normal first operation state of maximum power tracking MPPT, and at this time, the switch of the other BUCK circuits (e.g., BUCK1 or 3) except for the BUCK2 should preferably be turned on if the switch is present.
Referring to fig. 5, the way to decode the carrier signal/excitation pulse RIP, i.e. read the data, is: monitoring the carrier signal on the transmission line LIN with a sensor (e.g., a rogowski air coil sensor) 115 generally requires that the transmission line LIN pass through the coil of the sensor 115 and then extracting a signal carrying DATA having a specified frequency range (equal to or close to the PWM frequency) from the carrier signal sensed by the sensor with a band pass filter 120, so that the sensor 115 and band pass filter 120 together achieve the desired monitoring of the carrier signal on the transmission line LINAnd (4) capturing the data. The data may then be processed from the bandpass filtered gated carrier signal using a processing unit 150 with a DSP/MCU. Because data can be easily sent from one side of the photovoltaic module, the monitoring of the working state of the photovoltaic module is very effective, the output current and voltage of each CELL string CELL/each individual CELL panel 10 and the optimization circuit can be collected by means of very common current and voltage collecting modules in the prior art, the power belongs to parameters which can be calculated according to the current and voltage, the real-time temperature condition of the photovoltaic module PV can be collected by means of a temperature collecting module, the collection of the parameters can be realized by a collecting module carried by the control module 110 or an external collecting module which is separately arranged relative to the control module 110, the collecting module transmits the parameters to the control module 110, the control module 110 usually has an analog-to-digital conversion function and an operation function of other attributes, and the control module 110 sends the parameters to the transmission line LIN in a binary system, the decoding of the data enables real-time monitoring of the components. Therefore, the voltage and the temperature of each individual battery board 10 can be directly monitored from the battery board 10 in real time, and the output current and the voltage of each battery string CELL are also monitored in real time. First output node B1 of first stage BUCK1 circuit in power optimization circuit OPTM corresponding to component PVMN1And a second output node B3 of the last stage BUCK3 circuitN2The current flowing between the first stage BUCK1 circuit and the second stage BUCK1 circuit can be regarded as the output current of the battery string CELL1-3, because the current is in series connection, and the first output node B1 of the first stage BUCK1 circuitN1And a second output node B1N2The voltage between the first and second stages can be regarded as the output voltage of the CELL1, and the first output node B2 of the second stage BUCK2 circuitN1And a second output node B2N2The voltage between the first and second stages can be regarded as the output voltage of the CELL string CELL2, and the first output node B3 of the third stage BUCK3 circuitN1And a second output node B3N2The voltage in between can be regarded as the output voltage of the battery string CELL 3.
While the present invention has been described with reference to the preferred embodiments and illustrative embodiments, it is to be understood that the invention as described is not limited to the disclosed embodiments. Various alterations and modifications will no doubt become apparent to those skilled in the art after having read the above description. Therefore, the appended claims should be construed to cover all such variations and modifications as fall within the true spirit and scope of the invention. Any and all equivalent ranges and contents within the scope of the claims should be considered to be within the intent and scope of the present invention.
Claims (9)
1. A power optimization circuit integrating a data communication function is used for carrying out power optimization on a photovoltaic module and is characterized in that the power optimization circuit is provided with BUCK circuits, the number of the BUCK circuits is consistent with the number of battery strings of the photovoltaic module;
any stage of BUCK circuit executes MPPT calculation on the voltage received from a battery string and performs BUCK conversion to output the voltage on an output capacitor of the BUCK circuit, the output capacitors of the BUCK circuits of the power optimization circuit are connected in series, and the total output voltage of the power optimization circuit is provided by the voltage superposed on the output capacitors connected in series;
at least one BUCK circuit is provided with a change-over switch, and an output capacitor of any one stage of BUCK circuit with the change-over switch is correspondingly connected with the change-over switch in series;
when the change-over switch of any stage of BUCK circuit with the change-over switch is switched on, the BUCK circuit of any stage is in a first working mode that the voltage received by the BUCK circuit of any stage is subjected to voltage reduction conversion and output;
when the switch of any stage of BUCK circuit with the switch is turned off, the BUCK circuit of any stage is in a second working mode of coupling excitation pulses jumping between high and low levels to a transmission line connected with an output capacitor of the BUCK circuit in series as a carrier signal, wherein the excitation pulses are derived from: the pulse width modulation signal driving the BUCK circuit at this stage forces the voltage outputted by the BUCK circuit of any stage to have step change along with the frequency of the pulse width modulation signal and is used as an excitation pulse;
each path of pulse width modulation signal output by one control module respectively drives each stage of BUCK circuit to execute MPPT calculation, wherein when any stage of BUCK circuit with a change-over switch is in a second working mode:
the control module drives the change-over switch of the BUCK circuit of any stage to be switched off, and simultaneously the control module also generates a pulse width modulation signal to drive the BUCK circuit of any stage to be clamped in a state of outputting an excitation pulse;
when the optional stage of BUCK circuit is in the second working mode, the other stages of BUCK circuits work in a normal first working state of maximum power point tracking, the voltage output by the other stages of BUCK circuits is stabilized between an upper limit value and a lower limit value, the voltage output by the optional stage of BUCK circuit is used as an excitation pulse, but the positive amplitude of the excitation pulse is larger than the upper limit value, and the negative amplitude of the excitation pulse is lower than the lower limit value.
2. The power optimization circuit of claim 1, wherein each BUCK circuit includes first and second input terminals coupled to the positive and negative poles of a battery string, and further including a main switch and an inductor coupled between its first input terminal and a first output node, both the main switch and the inductor being coupled at an interconnection node; and
a freewheeling switch or a freewheeling diode is connected between the interconnection node and the second input terminal, wherein the second input terminal and the second output node of each stage of the BUCK circuit are coupled together.
3. The power optimization circuit according to claim 2, wherein in any one stage of the BUCK circuit provided with the changeover switch, the changeover switch and the output capacitor are connected in series between the first output node and the second output node of the BUCK circuit of the any one stage.
4. The power optimization circuit of claim 2, wherein the multistage BUCK circuits are connected in series in a manner that: the first output node of any succeeding stage of the BUCK circuits is connected to the second output node of the preceding stage of the BUCK circuits adjacent thereto, and a total output voltage is supplied between the first output node of the first stage of the BUCK circuits and the second output node of the last succeeding stage of the BUCK circuits.
5. The power optimization circuit of claim 1, wherein the control module sends data to the transmission line by: controlling any stage of BUCK circuit with a change-over switch to be in a first working mode or to be in a second working mode at least once in each period of a preset time period; wherein
When the transmission line is loaded with the excitation pulse in each period, a binary code element representing data transmitted to the transmission line by the control module is one of 1 or 0;
and the binary code element which is used for representing the data transmitted to the transmission line by the control module when the transmission line is not loaded with any excitation pulse in each period is the other one of 1 or 0.
6. The power optimization circuit of claim 1, wherein the data includes at least current, voltage of each string of cells in each photovoltaic module; and
the voltage and the temperature of each single cell panel in each cell string in each photovoltaic assembly are also included.
7. A method of communicating in a power optimization circuit according to claim 1, wherein:
at the stage that a control module for driving the BUCK circuit to execute MPPT operation does not send data, the control module controls a change-over switch of the BUCK circuit with the change-over switch to be continuously kept on, so that the BUCK circuit works in a first working mode;
in a time period when the control module sends data by utilizing a carrier signal, the control module controls a change-over switch of the BUCK circuit with the change-over switch to be always switched on in any period of the time period, so that the BUCK circuit enters a first working mode in the period without outputting excitation pulses; or
In the time period that the control module utilizes the carrier signal to send data, the change-over switch of the BUCK circuit with the change-over switch is controlled to be turned off at least once in any period of the time period, so that the BUCK circuit at least enters a second working mode once in the period and outputs the excitation pulse not lower than a cluster.
8. The communication method according to claim 7, wherein, in the period in which the control module transmits data using the carrier signal:
when the transmission line is loaded with the excitation pulse in each period, a binary code element representing data transmitted to the transmission line by the control module is one of 1 or 0;
and the binary code element which is used for representing the data transmitted to the transmission line by the control module when the transmission line is not loaded with any excitation pulse in each period is the other one of 1 or 0.
9. The communication method of claim 7, wherein the carrier signal is decoded by: a sensor is used for monitoring carrier signals on a transmission line, and a band-pass filter is used for extracting signals carrying data in a specified frequency range from the carrier signals sensed by the sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610910811.4A CN106301201B (en) | 2016-10-19 | 2016-10-19 | Power optimization circuit integrating data communication function and communication method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610910811.4A CN106301201B (en) | 2016-10-19 | 2016-10-19 | Power optimization circuit integrating data communication function and communication method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106301201A CN106301201A (en) | 2017-01-04 |
| CN106301201B true CN106301201B (en) | 2021-01-12 |
Family
ID=57718972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610910811.4A Active CN106301201B (en) | 2016-10-19 | 2016-10-19 | Power optimization circuit integrating data communication function and communication method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106301201B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107196604B (en) * | 2017-05-26 | 2020-03-24 | 阳光电源股份有限公司 | Photovoltaic power generation system and module IV curve scanning method thereof |
| CN109391223B (en) * | 2017-08-02 | 2020-11-03 | 丰郅(上海)新能源科技有限公司 | Photovoltaic power generation system capable of receiving and sending data in time intervals and data receiving and sending method thereof |
| CN109428628B (en) * | 2017-09-04 | 2021-06-01 | 丰郅(上海)新能源科技有限公司 | Method for transmitting real-time data and historical data of photovoltaic module |
| CN109672213B (en) * | 2017-10-17 | 2023-02-28 | 丰郅(上海)新能源科技有限公司 | Power optimization system containing secondary optimization and optimization method thereof |
| CN111726075B (en) * | 2019-03-20 | 2022-02-18 | 阳光电源股份有限公司 | Intelligent photovoltaic module and photovoltaic power generation system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10468993B2 (en) * | 2007-05-17 | 2019-11-05 | Enphase Energy, Inc. | Inverter for use in photovoltaic module |
| CN105958934B (en) * | 2016-06-03 | 2020-07-07 | 丰郅(上海)新能源科技有限公司 | Power optimizer |
-
2016
- 2016-10-19 CN CN201610910811.4A patent/CN106301201B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106301201A (en) | 2017-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106301201B (en) | Power optimization circuit integrating data communication function and communication method | |
| CN106253330B (en) | Photovoltaic power optimization system | |
| EP2980980B1 (en) | Inverter device | |
| CN105915156B (en) | Photovoltaic power generation system with power optimizer | |
| CN105958934B (en) | Power optimizer | |
| CN103887955A (en) | Grid-connected inverter for low-frequency current ripple output restraining of fuel cell and control device | |
| WO2010045068A4 (en) | Time averaged modulated diode apparatus for photovoltaic application | |
| CN104953945A (en) | High-efficiency photovoltaic power generation system and method | |
| CN104638971A (en) | Photovoltaic grid-connected inverter and control method thereof | |
| CN205195587U (en) | Grid -connected PV converter, photovoltaic power supply system and electrical apparatus | |
| Harfman-Todorovic et al. | A high efficiency PV micro-inverter with grid support functions | |
| CN105978476B (en) | Inverter | |
| CN108206670B (en) | Monitoring system and monitoring method for detecting insulation state of photovoltaic battery pack string | |
| CN105337520A (en) | Photovoltaic grid-connected converter, photovoltaic power supply system and electric appliance | |
| CN102938566A (en) | Control method for Z source type two-switch grid-connected inverter | |
| CN109217704B (en) | Non-isolated five-level inverter for suppressing system leakage current | |
| Vekhande et al. | Central multilevel current-fed inverter with module integrated DC-DC converters for grid-connected PV plant | |
| Stauth et al. | A distributed photovoltaic energy optimization system based on a sub-module resonant switched-capacitor implementation | |
| CN216625586U (en) | Wide-range input non-isolated three-port DC-DC converter | |
| CN106849177A (en) | A kind of buck-boost grid-connected inverter | |
| CN114499183A (en) | Wide-range input non-isolated three-port DC-DC converter | |
| CN108336753B (en) | Photovoltaic power generation system and method for realizing output power maximization | |
| CN110535172B (en) | Alternating current-direct current wind-solar hybrid power generation system and power smooth control method | |
| CN107257206B (en) | Three-terminal direct current transformer | |
| CN111293912A (en) | Multi-level inverter, system and control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |