WO2022227083A1 - 一种功率变换器盒及光伏系统 - Google Patents

一种功率变换器盒及光伏系统 Download PDF

Info

Publication number
WO2022227083A1
WO2022227083A1 PCT/CN2021/091739 CN2021091739W WO2022227083A1 WO 2022227083 A1 WO2022227083 A1 WO 2022227083A1 CN 2021091739 W CN2021091739 W CN 2021091739W WO 2022227083 A1 WO2022227083 A1 WO 2022227083A1
Authority
WO
WIPO (PCT)
Prior art keywords
power converter
photovoltaic
slave
module
master
Prior art date
Application number
PCT/CN2021/091739
Other languages
English (en)
French (fr)
Inventor
曹震
陈东
姚晓锋
程杰斌
顾桂磊
Original Assignee
华为数字能源技术有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 华为数字能源技术有限公司 filed Critical 华为数字能源技术有限公司
Priority to EP21938556.4A priority Critical patent/EP4322400A4/en
Priority to PCT/CN2021/091739 priority patent/WO2022227083A1/zh
Priority to CN202180096847.2A priority patent/CN117157875A/zh
Publication of WO2022227083A1 publication Critical patent/WO2022227083A1/zh
Priority to US18/496,226 priority patent/US20240063754A1/en

Links

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
    • H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • 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
    • H02S40/20—Optical components
    • 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
    • H02S40/34—Electrical components comprising specially adapted electrical connection means to be structurally associated with the PV module, e.g. junction boxes
    • 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
    • H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
    • H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • H02J3/381—Dispersed generators
    • 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

Definitions

  • the present application relates to the field of photovoltaic technology, in particular to a power converter box and a photovoltaic system.
  • a junction box is attached to the backplane of the solar panel (ie, the photovoltaic module), and the lead wire in the photovoltaic module is connected with the internal circuit in the junction box, and the junction box is connected with the external cable, so that the power generated by the photovoltaic module is connected with the external circuit.
  • split junction boxes especially three-part junction boxes that are well matched with module slicing technology have emerged.
  • a photovoltaic power converter (also referred to as a power converter for short) is also provided on the backplane of the photovoltaic module.
  • Existing power converters are generally external, and the power converter and the junction box can be connected by external cables.
  • the power converter can be integrated into the junction box.
  • the split-type junction box the power converter also becomes a split-type power converter, that is, there are at least two power converters in one photovoltaic module.
  • the photovoltaic module backplane is equipped with a three-part junction box. After the power converter is integrated into the junction box, the power converters also become three (that is, three-part power converters). At this time, how the photovoltaic module realizes the functions of module monitoring, module IV scanning, and module shutdown are the key research issues.
  • the inventors of the present application found that the power converters arranged on the backplane of a photovoltaic module are independent of each other. Taking the three-part power converter shown in FIG. 1 as an example, the three power converters independently communicate with an external (such as an inverter) on a power line carrier (PLC), and the inverter obtains the The information of the power converter controls the photovoltaic module to realize the functions of module monitoring, module IV scanning, and module shutdown.
  • PLC power line carrier
  • the embodiments of the present application provide a power converter box and a photovoltaic system, which can reduce costs.
  • an embodiment of the present application provides a power converter box, the power converter box is suitable for a photovoltaic system including at least two photovoltaic substrings; the power converter box includes at least two power converters, wherein, The input end of each power converter is coupled with the output end of the corresponding photovoltaic substring, the output end of each power converter is coupled in series, and the two ends of the output end of each power converter are coupled in series to the inverter in the photovoltaic system.
  • the above-mentioned at least two power converters include a master power converter and at least one slave power converter, that is, it can be understood that the power converter in the embodiment of the application is divided into a master power converter and a slave power converter, except The other power converters except the master power converter are all slave power converters.
  • the master power converter can collect the state information of the photovoltaic substring corresponding to the master power converter
  • the slave power converter can collect the state information of the photovoltaic substring corresponding to the slave power converter
  • Status information of the photovoltaic substrings is sent to the main power converter.
  • the master power converter can acquire the state information of the photovoltaic substring corresponding to the slave power converter and the state information of the photovoltaic substring corresponding to the master power converter.
  • the main power converter may send the state information of the photovoltaic substring corresponding to the slave power converter and the state information of the photovoltaic substring corresponding to the main power converter to the inverter.
  • communication can be performed between the master power converter and each of the slave power converters.
  • Each power converter sends the state information of its corresponding photovoltaic substring to the main power converter, and then the main power converter sends the state information of all photovoltaic substrings of the photovoltaic module to the inverter.
  • each power converter includes a pulse width modulation module, and the master power converter and the slave power converter communicate with each other through the pulse width modulation module.
  • the above-mentioned secondary power converter further includes a first switch module, wherein the above-mentioned secondary power converter passes through a switch in the secondary power converter.
  • the pulse width modulation module generates a first pulse width signal from the state information of the photovoltaic substring corresponding to the slave power converter, and sends the first pulse width signal to the first switch module to control the output of the first switch module voltage; the output voltage of the first switch module carries the state information of the photovoltaic substring corresponding to the slave power converter; the master power converter acquires the slave power converter by collecting the output voltage of the first switch module in the slave power converter Status information of the photovoltaic substring corresponding to the power converter.
  • each power converter includes at least one infrared module; the above-mentioned master power converter and the above-mentioned slave power converter communicate through the infrared module.
  • each power converter includes at least one serial communication module; wherein, the serial communication modules between the power converters are coupled through isolation capacitors; the above-mentioned main power converter The converter communicates with the above-mentioned slave power converter through the serial communication module.
  • each power converter includes at least one voltage shift module; the master power converter and the slave power converter perform analog communication through the voltage shift module.
  • each of the above photovoltaic substrings includes two parallel substring units, and the two parallel substring units The parallel point between them is the output end of the photovoltaic substring where the two parallel substring units are located.
  • the photovoltaic sub-string is divided into two parallel sub-string units, which can reduce the heat generation of the photovoltaic sub-string while ensuring the same power output.
  • each power converter has a positive output terminal and a negative output terminal;
  • the above-mentioned first slave power converter includes: The first slave power converter and the second slave power converter; the serial coupling of the output ends of the above power converters is specifically implemented as: the positive output end of the first slave power converter is coupled to the positive input end of the inverter, the The negative output end of the first slave power converter is coupled to the positive output end of the master power converter, the negative output end of the master power converter is coupled to the positive output end of the second slave power converter, and the second slave power converter The negative output terminal of the inverter is coupled to the negative input terminal of the inverter.
  • the main power converter is located in the middle of the various power converters in the photovoltaic system.
  • the above-mentioned main power converter can receive the control information sent by the inverter through the above-mentioned PLC communication module, and according to the control information
  • the output power of the string is controlled;
  • the control information is generated by the inverter according to the state information of at least one photovoltaic substring in the photovoltaic module;
  • the master power converter can also send the control information to the slave power converter;
  • the slave power converter can control the output power of the photovoltaic substring corresponding to the slave power converter according to the control information.
  • an embodiment of the present application provides a power converter box, the power converter box includes a photovoltaic system of at least two photovoltaic substrings, the power converter box includes at least two power converters, wherein each power converter The input ends of the converters are coupled with the output ends of the corresponding photovoltaic substrings, the output ends of each power converter are coupled in series, and the two ends of the output ends of each power converter are coupled in series to the inverter in the photovoltaic system.
  • the above-mentioned at least two power converters include a main power converter and at least one slave power converter, that is, it can be understood that the power converter in the embodiment of the application is divided into a main power converter and a slave power converter, except that the main power converter
  • the other power converters except the converter are all slave power converters.
  • the above-mentioned main power converter can receive the control information sent by the inverter through the power line carrier PLC communication module in the main power converter, and control the output power of the photovoltaic substring corresponding to the main power converter according to the control information;
  • the above-mentioned master power converter can also send the control information to the slave power converter;
  • the slave power converter can control the output power of the photovoltaic substring corresponding to the slave power converter according to the control information.
  • communication can be performed between the master power converter and each of the slave power converters.
  • each power converter includes a pulse width modulation module, and the master power converter and the slave power converter communicate with each other through the pulse width modulation module.
  • the above-mentioned main power converter further includes a second switch module, wherein the main power converter passes the switch in the main power converter.
  • the pulse width modulation module generates a second pulse width signal from the control information, and sends the second pulse width signal to the first switch module to control the output voltage of the second switch module; the output voltage of the second switch module Carrying the above-mentioned control information; the above-mentioned slave power converter acquires the above-mentioned control information by collecting the output voltage of the second switch module in the above-mentioned main power converter.
  • each power converter includes at least one infrared module; the above-mentioned master power converter and the above-mentioned slave power converter communicate through the infrared module.
  • each power converter includes at least one serial communication module; wherein, the serial communication modules between the power converters are coupled through isolation capacitors; the above-mentioned main power converter The converter communicates with the above-mentioned slave power converter through the serial communication module.
  • each power converter includes at least one voltage shift module; the master power converter and the slave power converter perform analog communication through the voltage shift module.
  • each of the above photovoltaic substrings includes two parallel substring units, and the two parallel substring units The parallel point between them is the output end of the photovoltaic substring where the two parallel substring units are located.
  • each power converter has a positive output terminal and a negative output terminal;
  • the above-mentioned first slave power converter includes: The first slave power converter and the second slave power converter; the serial coupling of the output ends of the above power converters is specifically implemented as: the positive output end of the first slave power converter is coupled to the positive input end of the inverter, the The negative output end of the first slave power converter is coupled to the positive output end of the master power converter, the negative output end of the master power converter is coupled to the positive output end of the second slave power converter, and the second slave power converter The negative output terminal of the inverter is coupled to the negative input terminal of the inverter.
  • the above-mentioned master power converter can collect photovoltaic substring information corresponding to the main power converter; the above-mentioned slave power converter can collect photovoltaic substring information corresponding to the slave power converter.
  • the state information of the photovoltaic sub-string corresponding to the slave power converter is sent to the above-mentioned master power converter; the master power converter can obtain the state information of the photovoltaic sub-string corresponding to the above-mentioned slave power converter, and
  • the state information of the photovoltaic substring corresponding to the slave power converter and the state information of the photovoltaic substring corresponding to the master power converter are sent to the inverter through the PLC communication module.
  • embodiments of the present application provide a photovoltaic system
  • the photovoltaic system includes at least two photovoltaic substrings, an inverter, and a power conversion in combination with the first aspect or in any possible implementation manner of the first aspect A box, wherein the at least two photovoltaic substrings are located in the same photovoltaic assembly.
  • an embodiment of the present application provides a photovoltaic system, the photovoltaic system includes at least two photovoltaic substrings, an inverter, and a power conversion in combination with the second aspect or in any possible implementation manner of the second aspect. box; wherein the at least two photovoltaic substrings are located in the same photovoltaic assembly.
  • FIG. 1 is a structural block diagram of a three-part power converter in the prior art
  • FIG. 2 is a structural block diagram of a photovoltaic system provided by an embodiment of the present application.
  • FIG. 3 is a partial structural block diagram of the photovoltaic system provided by the embodiment of the present application.
  • FIG. 4 is a structural block diagram of another part of the photovoltaic system provided by the embodiment of the present application.
  • FIG. 5 is a structural block diagram of a power converter box provided by an embodiment of the present application.
  • FIG. 6 is a communication flow chart of the photovoltaic system provided by the embodiment of the present application.
  • FIG. 7 is another communication flow chart of the photovoltaic system provided by the embodiment of the present application.
  • FIG. 8 is a block diagram of a communication structure of a power converter box provided by an embodiment of the present application.
  • FIG. 9 is a block diagram of another communication structure of the power converter box provided by the embodiment of the present application.
  • FIG. 10 is a block diagram of another communication structure of the power converter box provided by the embodiment of the application.
  • FIG. 11 is a schematic waveform diagram of an output end of a power converter box provided by an embodiment of the application.
  • FIG. 12 is a block diagram of another communication structure of the power converter box provided by the embodiment of the present application.
  • FIG. 2 is a structural block diagram of a photovoltaic system provided by an embodiment of the present application.
  • the photovoltaic system includes at least one photovoltaic component (eg photovoltaic component 201 , photovoltaic component 202 , photovoltaic component 203 , photovoltaic component 204 , etc.) and an inverter 21 , and each photovoltaic component can be connected in series and parallel to form a photovoltaic component
  • the array is provided to provide DC power to the inverter 21, and the inverter 21 can convert the DC power to AC power.
  • the photovoltaic assembly 201 and the photovoltaic assembly 202 are coupled to the inverter 21 in series, and output the first direct current to the inverter 21 ; the photovoltaic assembly 203 and the photovoltaic assembly 204 are coupled to the inverter 21 in series, and output to the inverter 21 second direct current.
  • connection between A and B can be either a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components, such as a direct connection between A and C, and a direct connection between C and B. , so that A and B are connected through C.
  • a switch, a power distribution cabinet, etc. may be provided between each photovoltaic module and the inverter 21 .
  • each photovoltaic module may be provided with a power converter box correspondingly, for example, the backplane of the photovoltaic module 201 is provided with a power converter box 1 , and the backplane of the photovoltaic module 202 is provided with a power converter box 2 , The backplane of the photovoltaic component 203 is provided with a power converter box 3 and the backplane of the photovoltaic component 204 is provided with a power converter box 4 and the like.
  • each power converter box may include at least two power converters.
  • some photovoltaic modules in the photovoltaic system may be provided with power converter boxes correspondingly, for example, the backplane of the photovoltaic module 201 is provided with a power converter box 1 , the photovoltaic modules 202 , the photovoltaic modules 203 and The photovoltaic module 204 backplane is not provided with a power converter box (not shown in the figure).
  • the embodiments of the present application do not limit the number of photovoltaic modules provided with power converter boxes in the photovoltaic system.
  • the photovoltaic modules in the embodiments of the present application are three-segmented, that is, each photovoltaic module includes three photovoltaic substrings.
  • the output of each photovoltaic substring is coupled to the input of the power converter one by one.
  • the output terminals of multiple photovoltaic sub-strings may be coupled to the input terminal of one power converter, that is, the multiple photovoltaic sub-strings share one power converter.
  • This embodiment of the present application does not limit the number of photovoltaic substrings corresponding to the power converter.
  • the power converter box in the embodiment of the present application can perform maximum power tracking (Maximum Power Point Tracking, MPPT) on the photovoltaic substrings in the photovoltaic module.
  • MPPT Maximum Power Point Tracking
  • the power converter can detect the current and voltage output by the photovoltaic substring, and control the power converter by adjusting the duty cycle of the DC/DC conversion circuit (such as a BUCK circuit, a BOOST circuit or a BUCK-BOOST circuit, etc.) in the power converter.
  • the DC/DC conversion circuit such as a BUCK circuit, a BOOST circuit or a BUCK-BOOST circuit, etc.
  • the power converter in this embodiment of the present application may not have the above-mentioned MPPT function, but has a shutdown function.
  • the connection between the photovoltaic sub-string and the photovoltaic system can be cut off, so as to prevent the photovoltaic sub-string from affecting the operation of the photovoltaic system.
  • the power converter can be understood as a shutdown device.
  • the power converter box in the embodiment of the present application includes at least two power converters, and the at least two power converters include a master power converter and at least one slave power converter.
  • communication can be performed between the master power converter and each of the slave power converters.
  • the master power converter first receives the control information sent by the inverter, and then the master power converter sends the control information to each slave power converter.
  • each power converter sends the state information of the corresponding photovoltaic substring to the inverter
  • each slave power converter first sends the state information of the corresponding photovoltaic substring to the master power converter, and then the master power converter sends the state information of the corresponding photovoltaic substring to the master power converter.
  • the inverter sends the status information of all PV substrings in the PV module to the inverter.
  • the slave power converter does not need to be equipped with an external communication module, nor does it need to connect a communication cable to the inverter, only the main power converter needs to be equipped with an external communication module, thereby reducing the manufacturing cost of the power converter box.
  • FIG. 3 is a partial structural block diagram of a photovoltaic system provided by an embodiment of the present application.
  • the photovoltaic module 201 includes at least two photovoltaic substrings (for example, photovoltaic substrings 2011 , photovoltaic substrings 2012 , and photovoltaic substrings 2013 , etc.);
  • the power converter box 1 includes at least two power converters, the at least The two power converters include one master power converter 12 and at least one slave power converter (eg, slave power converter 11 and slave power converter 13, etc.).
  • FIG. 3 takes one photovoltaic substring corresponding to one power converter as an example.
  • the photovoltaic substring 2011 corresponds to the slave power converter 11
  • the photovoltaic substring 2012 corresponds to the master power converter 12
  • the photovoltaic substring 2013 corresponds to the slave power converter 13 .
  • each power converter is coupled with the output terminal of each corresponding photovoltaic substring.
  • each photovoltaic substring has two output terminals respectively, and each power converter has two input terminals respectively.
  • the positive output terminal of the photovoltaic substring 2011 is coupled from the positive input terminal of the power converter 11
  • the negative output terminal of the photovoltaic substring 2011 is coupled from the negative input terminal of the power converter 11 .
  • the positive input terminal of the main power converter 12 is coupled to the positive output terminal of the photovoltaic substring 2012
  • the negative input terminal of the main power converter 12 is coupled to the negative output terminal of the photovoltaic substring 2012 .
  • the positive output terminal of the photovoltaic substring 2013 is coupled from the positive input terminal of the power converter 13
  • the negative output terminal of the photovoltaic substring 2013 is coupled from the negative input terminal of the power converter 13 .
  • each photovoltaic substring includes two parallel substring units, and the parallel point between the two parallel substring units is the output end of the photovoltaic substring where the two parallel substring units are located.
  • the photovoltaic substring 2011 includes a substring unit 2011-1 and a substring unit 2011-2, and the substring unit 2011-1 is connected in parallel with the substring unit 2011-2.
  • the positive output terminal of the substring unit 2011-1 and the positive output terminal of the substring unit 2011-2 are coupled to the positive input terminal of the slave power converter 11, and the negative output terminal of the substring unit 2011-1 and the substring unit 2011-2 are coupled to the positive input terminal of the slave power converter 11.
  • the negative output terminal of is coupled to the negative input terminal of the slave power converter 11 .
  • the positive output terminal of the substring unit 2012-1 and the positive output terminal of the substring unit 2012-2 are coupled to the positive output terminal of the main power converter 12, and the negative output terminal of the substring unit 2012-1 is connected to the positive output terminal of the substring unit 2012-1.
  • the negative output of 2012-2 is coupled to the negative output of main power converter 12 .
  • the positive output terminal of the substring unit 2013-1 and the positive output terminal of the substring unit 2013-2 are coupled to the positive output terminal of the slave power converter 13, and the negative output terminal of the substring unit 2013-1 is coupled to the positive output terminal of the substring unit 2013-2.
  • the negative output terminal is coupled to the negative output terminal of the slave power converter 13 .
  • each power converter has positive and negative output terminals respectively.
  • the series coupling of the power converters is that the negative output terminal of one power converter is coupled to the positive output terminal of the other power converter.
  • the two ends of the output ends of each power converter coupled in series may be coupled to the inverter 21 in the photovoltaic system.
  • the two ends of the multiple power converters in the multiple photovoltaic modules are coupled in series to the inverter 21 in the photovoltaic system.
  • the photovoltaic system includes the slave power converter 11 (ie the first slave power converter) shown in FIG. 3 and FIG.
  • the power converter 12 and the slave power converter 13 ie the second slave power converter.
  • the positive output terminal of the first slave power converter is coupled to the positive output terminal PV1+ of the photovoltaic module 201 (ie, the positive input terminal of the inverter 21 ), and the negative output terminal of the first slave power converter is coupled to the main power converter 12
  • the positive output terminal of the main power converter 12 is coupled to the positive output terminal of the second slave power converter, and the negative output terminal of the second slave power converter is coupled to the negative output terminal PV1- of the photovoltaic module 201 (ie, coupled to to the negative input of inverter 21).
  • the main power converter 12 is located in the middle of the various power converters in the photovoltaic system.
  • main power converters in the embodiments of the present application may also be located on both sides of each power converter in the photovoltaic system (not shown in the figure), and the installation positions of the main power converters are not carried out in the embodiments of the present application. limit.
  • FIG. 5 is a structural block diagram of a power converter box provided by an embodiment of the present application. As shown in FIG. 5 , each power converter has two input terminals and two output terminals. For example, the positive input terminal of the slave power converter 11 is Vin1+, the negative input terminal of the slave power converter 11 is Vin1-, and the slave power converter 11 is Vin1-.
  • the positive output terminal of the converter 11 is OUT1+, the negative output terminal of the slave power converter 11 is OUT1-; the positive input terminal of the main power converter 12 is Vin2+, the negative input terminal of the main power converter 12 is Vin2-, the main power The positive output terminal of the converter 12 is OUT2+, the negative output terminal of the main power converter 12 is OUT2-; the positive input terminal of the slave power converter 13 is Vin3+, the negative input terminal of the slave power converter 13 is Vin3-, the slave power The positive output terminal of the converter 13 is OUT3+, and the negative output terminal of the slave power converter 13 is OUT3-.
  • Each power converter includes a power conversion module and an auxiliary power supply
  • the slave power converter 11 includes a power conversion module 111 and an auxiliary power supply 113
  • the main power converter 12 includes a power conversion module 121 and an auxiliary power supply 123
  • the converter 13 includes a power conversion module 131 and an auxiliary power source 133 .
  • the power conversion module in each power converter may be a DC/DC conversion circuit, for example, may be any one of a BUCK circuit, a BOOST circuit, or a BUCK-BOOST circuit.
  • the circuit structures of the power conversion modules between the power converters may be the same or different, and the embodiments of the present application do not limit the specific circuit structures of the power conversion modules.
  • the input of the auxiliary power supply in each power converter is the output of the power conversion module in each power converter.
  • the auxiliary power supply in each power converter is used to supply power to the communication module in each power converter.
  • each power converter also includes a communication module.
  • the slave power converter 11 further includes a first communication module 112
  • the master power converter 12 further includes a second communication module 122
  • the slave power converter 13 further includes a third communication module 132 .
  • each power converter The power supply relationship in each power converter is as follows: the first communication module 112 is powered by the auxiliary power supply 113, and the input power of the auxiliary power supply 113 comes from the power conversion module 111; the second communication module 122 is powered by the auxiliary power supply 123, and the auxiliary power supply 123 The input power source of the power conversion module 121 comes from the power conversion module 121 ; the third communication module 132 is powered by the auxiliary power source 133 , and the input power source of the auxiliary power source 133 comes from the power conversion module 131 .
  • the master power converter 12 may communicate with the respective slave power converters through the second communication module 122 .
  • the specific communication method may include wireless communication methods such as zigbee, WIFI, Bluetooth or infrared; the specific communication method may also include wired communication methods such as power line communication (PLC), RS485 or integrated circuit bus (Inter-Integrated Circuit, IIC).
  • PLC power line communication
  • RS485 integrated circuit bus
  • IIC Inter-Integrated Circuit
  • FIG. 6 is a communication flow chart of the photovoltaic system provided by the embodiments of the present application.
  • the communication process of the photovoltaic system in the embodiment of the present application may include the following steps:
  • the slave power converter sends the state information of the photovoltaic substring corresponding to itself to the master power converter.
  • Each slave power converter in the photovoltaic system collects state information of the corresponding photovoltaic substring, such as the output current and/or output voltage of the photovoltaic substring.
  • the slave power converter 11 when the slave power converter 11 sends the collected state information of the photovoltaic substring 2011 to the master power converter 12, it also sends the identity of the slave power converter 11 to the master power converter 12; Similarly, the slave power converter 12 sends the collected identification of the photovoltaic substring 2012 to the master power converter 12 .
  • the master power converter 12 may identify the state information of the photovoltaic substring corresponding to each slave power converter based on the identity identifier sent by each slave power converter.
  • the master power converter 12 may receive the status information of the photovoltaic substrings sent by each slave power converter according to a preset rule.
  • the master power converter 12 receives the status information of the photovoltaic substrings sent by each slave power converter in a query manner.
  • the main power converter 12 records the state information of the photovoltaic substring 2011 in the first target area; the main power converter 12 records the state information of the photovoltaic substring 2013 in the second target area.
  • the main power converter 12 further records the state information of the photovoltaic substrings 2012 collected by itself in the third target area.
  • the main power converter 12 may query the corresponding target area to identify the status information of each photovoltaic substring.
  • the main power converter sends the status information of all photovoltaic substrings in the photovoltaic module to the inverter.
  • the master power converter 12 can obtain the state information of the photovoltaic substring corresponding to each slave power converter through step S601, and the master power converter 12 can also collect the state information of the photovoltaic substring 2012 corresponding to the master power converter 12. In other words, the main power converter 12 can obtain status information for all photovoltaic substrings in the photovoltaic module. It should be noted that the state information of the photovoltaic substring 2012 collected by the main power converter 12 may be collected before step S601 or between step S601 and step S602. In this embodiment of the present application, the main power converter does not collect the corresponding state information of the main power converter. The time limit for the status information of the PV substrings.
  • the main power converter also includes an external communication module 124, and the main power converter 12 communicates all photovoltaic substrings (eg photovoltaic substring 2011, photovoltaic substring 2012, photovoltaic substring 2013, etc.) in the photovoltaic module through the external communication module 124. ) status information is sent to the inverter.
  • the external communication module 124 may be a power line communication (PLC) communication module.
  • PLC power line communication
  • communication can be performed between the master power converter and each of the slave power converters.
  • Each power converter sends the state information of its corresponding photovoltaic substring to the main power converter, and then the main power converter sends the state information of all photovoltaic substrings of the photovoltaic module to the inverter.
  • the inverter may generate control information based on the status information of any one or more photovoltaic substrings sent by the main power converter 12 , and deliver the control information to the main power converter 12 .
  • the main power converter 12 may control the output power of the photovoltaic substring 2012 corresponding to the main power converter 12 based on the control information.
  • the master power converter 12 can also send the control information to each of the slave power converters, and each of the slave power converters can control the output power of the corresponding photovoltaic substring according to the control information.
  • FIG. 7 is another communication flow chart of the photovoltaic system provided by the embodiment of the present application.
  • the communication process of the photovoltaic system in the embodiment of the present application may include the following steps:
  • the main power converter receives the control information sent by the inverter.
  • the main power converter 12 receives the control information sent by the inverter through the external communication module 124 .
  • the inverter may receive power station scheduling instructions in the photovoltaic system, and generate control information based on the power station scheduling instructions.
  • the control information may be a target power parameter of each photovoltaic component in the photovoltaic system, for example, the output power of each photovoltaic component is a target active power of 100kw.
  • the inverter may generate control information based on the status information of any one or more photovoltaic substrings in the photovoltaic modules sent by the main power converter 12 .
  • the inverter may determine whether the photovoltaic sub-string is faulty according to the magnitude of the output voltage/output current of the photovoltaic sub-string. For example, under normal circumstances, the output voltage of the photovoltaic sub-string is 30V. If the output voltage of the photovoltaic sub-string is 10V, it indicates that the photovoltaic sub-string is faulty, and the inverter can generate a shutdown signal.
  • the main power converter controls the output power of the photovoltaic substring corresponding to the main power converter according to the control information.
  • the main power converter 12 may obtain the control information sent by the inverter to the main power converter 12 according to the identity of the main power converter carried in the control information;
  • the target area acquires the control information delivered by the inverter to the main power converter 12 .
  • the main power converter 12 adjusts the duty cycle of the switching tubes in the power converter module 121 according to the above control information, thereby adjusting the output voltage and/or output voltage of the photovoltaic substring 2012 corresponding to the main power converter 12 or output current.
  • the main power converter 12 has a shutdown function, and when the photovoltaic substring 2012 fails, the inverter generates control information (ie, a first shutdown signal).
  • the main power converter 12 turns off the circuit of the photovoltaic substring 2012 outputting the direct current to the power conversion module 121 according to the first shutdown signal, which can prevent the photovoltaic substring 2012 from affecting the photovoltaic system.
  • the master power converter sends the above control information to each slave power converter.
  • step S702a may be performed simultaneously with step S702b, step S702a may also be performed before step S702b, and step S702a may also be performed before step S702b Execute afterwards.
  • the master power converter 12 forwards the control information received from the inverter to each of the slave power converters.
  • control information carries the identity of each power converter
  • each slave power converter can obtain the control information delivered by the inverter to each slave according to the identity carried in the control information.
  • each of the slave power converters obtains control information from the respective corresponding target areas according to preset rules and sends the inverter to the respective control information.
  • the slave power converter 11 obtains the control information from the first target area that the inverter sends to the slave power converter 11; the slave power converter 13 obtains the inverter from the third target area and sends it to the slave power converter 13. controller 13 control information.
  • the slave power converter controls the output power of the photovoltaic substring corresponding to the slave power converter according to the foregoing control information.
  • the slave power converter 11 can adjust the duty cycle of the switch tube in the power conversion module 111 according to the above control information, so as to adjust the output voltage and/or output voltage of the photovoltaic substring 2011 corresponding to the slave power converter 11 or output current.
  • the slave power converter 13 can also adjust the duty cycle of the switch tube in the power conversion module 131 according to the above control information, thereby adjusting the output voltage and/or output current of the photovoltaic substring 2013 corresponding to the slave power converter 13 .
  • the slave power converter 11 and the slave power converter 13 have a shutdown function.
  • the inverter When the photovoltaic sub-string 2011 fails, the inverter generates control information (ie, a second shutdown signal), and the power converter 11 outputs the DC power circuit from the photovoltaic sub-string 2011 to the power conversion module 111 according to the second shutdown signal. When turned off, the photovoltaic substring 2011 can be prevented from affecting the photovoltaic system.
  • the inverter when the photovoltaic sub-string 2013 fails, the inverter generates control information (ie, a third turn-off signal), and the power converter 13 sends the photovoltaic sub-string 2013 to the power conversion module 131 according to the third turn-off signal.
  • the circuit that outputs the direct current is turned off, which can prevent the photovoltaic substring 2013 from affecting the photovoltaic system.
  • communication can be performed between the master power converter and each of the slave power converters.
  • the master power converter first receives the control information sent by the inverter, and then the master power converter sends the control information to each slave power converter.
  • the master power converter and each slave power converter can communicate with each other, and the master power converter is responsible for external communication (that is, communicating with the inverter), and the slave power converter is responsible for external communication (ie, communication with the inverter).
  • the master power converter is responsible for external communication (that is, communicating with the inverter)
  • the slave power converter is responsible for external communication (ie, communication with the inverter).
  • Only the main power converter is equipped with an external communication module, and the communication cable is connected to the inverter, which can reduce the preparation cost of the power converter and reduce the photovoltaic power consumption. The cost of using cables in the system.
  • the communication mode between the master power converter and each slave power converter in the embodiment of the present application may be wireless communication such as zigbee, WIFI, Bluetooth, or infrared, or may be wired communication such as PLC, RS485, or IIC. Further, the communication method between the master power converter and each slave power converter may also be a combination of wireless communication and wired communication. For example, WIFI is used between the master power converter and the first slave power converter. Communication, PCL communication between the master power converter and the second slave power converter, etc.
  • junction box including one master power converter and two slave power converters in the embodiment of the present application as an example
  • connection between the master power converter and each slave power converter in the power converter box is described with reference to FIGS. 8 to 12.
  • the communication methods are described by way of example rather than being exhaustive, and it should be understood that in addition to the communication methods described in the embodiments of the present application, there may be other methods to implement the communication between the master power converter and each slave power converter.
  • FIG. 8 is a block diagram of a communication structure of a power converter box according to an embodiment of the present application.
  • each power converter includes at least one infrared module, and the master power converter and the slave power converter communicate through the infrared module.
  • the first slave power converter includes a first infrared module 81
  • the master power converter includes two infrared modules (for example, the second infrared module 82 and the third infrared module 83), and the second slave power converter A fourth infrared module 84 is included.
  • the first infrared module 81 establishes communication with the second infrared module 82
  • the third infrared module 83 establishes communication with the fourth infrared module 84 .
  • each infrared module includes an infrared transmitting module and an infrared receiving module respectively.
  • the first infrared module 81 includes a first infrared transmitting module 81a and a first infrared receiving module 81b; the second infrared module 82 includes a second infrared transmitting module 82a and a second infrared receiving module 82b.
  • the first slave power converter can send the state information of the photovoltaic substring corresponding to the first slave power converter to the second infrared receiving module in the master power converter through the first infrared transmitting module 81a 82b.
  • the master power converter may send the control information sent by the inverter to the first infrared receiving module 81b in the first slave power converter through the second infrared transmitting module 82a.
  • the third infrared module 83 includes a third infrared transmitting module 83a and a third infrared receiving module 83b;
  • the fourth infrared module 84 includes a fourth infrared transmitting module 84a and a fourth infrared receiving module 84b.
  • the second slave power converter sends the state information of the photovoltaic substring corresponding to the second slave power converter to the third infrared receiving module 83b in the master power converter through the fourth infrared transmitting module 84a .
  • the master power converter may send the control information sent by the inverter to the fourth infrared receiving module 84b in the second slave power converter through the third infrared transmitting module 83a.
  • FIG. 9 is a block diagram of another communication structure of the power converter box provided by the embodiment of the present application.
  • each power converter includes at least one serial communication module, wherein the serial communication modules between the power converters are coupled through isolation capacitors, and the master power converter and the slave power converter pass through the serial communication module.
  • Serial communication module for communication.
  • the first slave power converter includes a first serial port communication module 901
  • the master power converter includes two serial port communication modules (for example, a second serial port communication module 902 and a third serial port communication module 903)
  • the second slave The power converter includes a fourth serial communication module 904 .
  • the first serial communication module 901 establishes communication with the second serial communication module 902, and the third serial communication module 903 establishes communication with the fourth serial communication module 904.
  • the first serial communication module 901 and the second serial communication module 902 are coupled through an isolation capacitor C1 and an isolation capacitor C2.
  • the isolation capacitor C1 and the isolation capacitor C2 are on different communication loops.
  • the isolation capacitor C1 is on the communication loop that sends information from the first slave power converter to the master power converter
  • the isolation capacitor C2 is on the communication loop that sends information from the master power converter to the first slave power converter. vice versa.
  • the master power converter and each slave power converter are located in separate boxes, that is, the master power converter and each slave power converter are not on the same reference ground, and isolation capacitors (such as C1 and C2) are used to convert the first slave power.
  • the converter is located on the same reference ground as the main power converter.
  • the first slave power converter can send the state information of the photovoltaic substring corresponding to the first slave power converter to the second serial port communication module in the master power converter through the first serial port communication module 901 902.
  • the master power converter may send the control information sent by the inverter to the first serial port communication module 901 in the first slave power converter through the second serial port communication module 902 .
  • serial communication For the specific implementation of serial communication, reference may be made to the prior art, which will not be repeated here.
  • the third serial port communication module 903 and the fourth serial port communication module 904 are coupled through the isolation capacitor C3 and the isolation capacitor C4.
  • the isolation capacitor C3 and the isolation capacitor C4 are on different communication circuits.
  • the isolation capacitor C3 is on the communication circuit for sending information from the second slave power converter to the main power converter
  • the isolation capacitor C4 is connected to the main power converter to the main power converter. The first sends information from the power converter on the communication loop and vice versa.
  • Isolation capacitors eg C3 and C4 are used to keep the second slave power converter on the same ground reference as the master power converter.
  • the second slave power converter can send the state information of the photovoltaic substring corresponding to the second slave power converter to the third serial port communication module in the master power converter through the fourth serial port communication module 904 903.
  • the master power converter may send the control information sent by the inverter to the fourth serial port communication module 904 in the second slave power converter through the third serial port communication module 903 .
  • serial communication For the specific implementation of serial communication, reference may be made to the prior art, which will not be repeated here.
  • FIG. 10 is a block diagram of another communication structure of the power converter box provided by the embodiment of the present application.
  • each power converter includes a pulse width modulation module, and communication between the master power converter and the slave power converter is performed through the pulse width modulation module.
  • the first slave power converter includes a first pulse width modulation module 1015 and a first switch module 1012 .
  • the first slave power converter generates a first pulse width signal from the state information of the photovoltaic substring corresponding to the slave power converter through the first pulse width modulation module 1015, and sends the first pulse width signal to the first switch module 1012, to control the output voltage of the first switch module 1012; the output voltage of the first switch module 1012 carries the state information of the photovoltaic substring corresponding to the first slave power converter.
  • the master power converter obtains the first output impedance module by collecting the output voltage of the first switch module 1012 in the first slave power converter to obtain the state information of the photovoltaic substrings corresponding to the first slave power converter respectively.
  • the first slave power converter further includes a first input impedance module 1011, a first output impedance module 1013 and a first power adjustment module 1014, wherein the first power adjustment module 1014 and the first pulse width modulation module 1015 are Modules in the first control unit.
  • the state information of the photovoltaic substring corresponding to the first slave power converter is sensed by the first input impedance module 1011 and transmitted to the first control unit.
  • the first power adjustment module 1014 in the first control unit is configured to adjust the output power of the photovoltaic sub-string corresponding to the first slave power converter, so as to realize the MPPT of the photovoltaic sub-string.
  • the output voltage of the first switch module 1012 is transmitted to the coupling module by the first output impedance module 1013, and the coupling module is used for coupling the output voltages of all the power converters for information transmission.
  • the first control unit may control the first pulse width modulation module 1015 according to the preset communication frequency.
  • a first pulse width signal is generated based on the state information of the photovoltaic substring. For example, when the first slave power converter works normally, the input voltage is 10V, the duty cycle is 50%, and the output voltage is 5V.
  • the first control unit can switch between a duty cycle of 49% and a duty cycle of 51% according to a preset communication frequency such as 1KHz, then the first switch module 1012 The output voltage switches between 4.9V and 5.1V, and the switching time is 1ms.
  • the first control unit may pre-set rules for triggering switching. For example, if the state information of the photovoltaic substring is that the output current is 5A, the first slave power converter needs to transmit a binary signal of "0101" to the master power converter. If the binary signal is "1", the duty cycle switching is triggered, otherwise, the original 50% duty cycle is maintained.
  • FIG. 11 is a schematic waveform diagram of an output end of a power converter box provided by an embodiment of the present application.
  • the sampling frequency of the second control unit is 200 Hz as an example.
  • the main power converter includes the second pulse width modulation module 1025 and the second switch module 1022 .
  • the main power converter generates a second pulse width signal from the control information sent by the inverter through the second pulse width modulation module 1025, and sends the second pulse width signal to the second switch module 1022 to control the second switch module
  • the output voltage of 1022; the output voltage of the second switch module 1022 carries the control information.
  • the first slave power converter acquires the control information by collecting the output voltage of the second switch module 1022 in the master power converter.
  • the main power converter further includes a second input impedance module 1021, a second output impedance module 1023, a second power adjustment module 1024, a remote communication impedance module 1026 and a remote communication module 1027, wherein the second power adjustment module 1024 And the second pulse width modulation module 1025 is a module in the second control unit.
  • the second power adjustment module 1024 in the second control unit can adjust the output power of the photovoltaic substring corresponding to the main power converter.
  • the second input impedance module 1021 can sense the state information of the photovoltaic substring corresponding to the main power converter, and transmit it to the second control unit.
  • the control information sent by the inverter is first sensed by the remote communication impedance module 1026, and then sent by the remote communication impedance module 1026 to the remote communication module 1027 (eg, a PLC communication module).
  • the remote communication module 1027 transmits the control information to the second control unit, and the second control unit can control the second pulse width modulation module 1025 according to the preset communication frequency to generate a second pulse width signal based on the control information, and control the second switch
  • the output voltage of the module 1022 and the output voltage of the second switch module 1022 are transmitted to the coupling module through the second output impedance module 1023 .
  • the specific control process is similar to the process of the first slave power converter described above in conjunction with FIG. 11 , and will not be repeated here.
  • the first control unit of the first slave power converter obtains the above control information by obtaining the output voltage of the second switch module 1022 from the coupling module.
  • FIG. 12 is a block diagram of another communication structure of the power converter box provided by the embodiment of the present application.
  • each power converter includes at least one voltage shift module, for example, the first slave power converter includes a first voltage shift module 1212, the master power converter includes a second voltage shift module 1222, and A third voltage shift module 1232 is included in the second slave power converter.
  • the voltage translation modules in each power converter may be coupled to the same communication line, that is, the first voltage translation module 1212 , the second voltage translation module 1222 and the third voltage translation module 1232 are coupled to the same communication line.
  • the voltage shift module in each power converter can boost the received analog communication signal according to the target level value. For example, if the output voltage of the photovoltaic string corresponding to the master power converter is 20V, the first voltage shift module 1212 in the first slave power converter and the third voltage shift module 1232 in the second slave power converter will The analog communication signal of the state information of the corresponding photovoltaic string is raised by 30V and then transmitted to the main power converter.
  • the second voltage shift module 1222 in the master power converter raises the analog communication signal of the control information sent by the inverter by 30V. It is then sent to the first slave power converter.
  • the voltage translation modules in each power converter can also be coupled to different communication lines. That is, it can be understood that the voltage values raised by each power converter are not the same voltage value.
  • the master power converter and the slave power converter can perform analog communication through the voltage shift module, and how to realize the analog communication between the voltage shift modules can refer to the level shift communication in the prior art, which will not be repeated here. .
  • each power converter also includes a power conversion module, for example, the first slave power converter includes a first power conversion module 1211, the master power converter includes a second power conversion module 1221, and the second slave power converter The converter includes a third power conversion module 1231.
  • the power conversion modules in each power converter can perform substring-level MPPT on the corresponding photovoltaic substrings.
  • the main power converter also includes a remote communication module 1223 (eg, a PLC communication module), which can receive control information sent by the inverter.
  • division of units in this application is only a logical function division. In actual implementation, there may be other division methods, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be ignored, or not.
  • the unit described above as a separate component may or may not be physically separated, and the component displayed as a unit may or may not be a physical unit, that is, it may be located in one place or distributed to multiple network units; Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.
  • each functional unit in each embodiment of the present invention may all be integrated into one processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit; the above-mentioned integration
  • the unit can be implemented either in the form of hardware or in the form of hardware plus software functional units.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

本申请提供了一种功率变换器盒，应用于光伏系统中，该功率变换器盒包括至少两个功率变换器，该至少两个功率变换器包括一个主功率变换器和至少一个从功率变换器；该主功率变换器获取所述从功率变换器对应的光伏子串的状态信息，并通过主功率变换器中的PLC通信模块将从功率变换器对应的光伏子串的状态信息和主功率变换器对应光伏子串的状态信息发送至逆变器；该主功率变换器还通过主功率变换器中的PLC通信模块接收逆变器发送的控制信息，基于该控制信息对主功率变换器对应的光伏子串的输出功率进行控制，并将该控制信息发送至从功率变换器。实施本申请，可以实现子串级别MPPT，主功率变换器与从功率变换器之间可以进行通信，成本低。

Description

一种功率变换器盒及光伏系统 技术领域
本申请涉及光伏技术领域，尤其是一种功率变换器盒及光伏系统。
背景技术
太阳能电池板(即光伏组件)的背板粘有接线盒，光伏组件内的引出线与接线盒内的内部线路相连，该接线盒与外部线缆连接，使得光伏组件产生的电力与外部线路连接。随着组件切片和双面组件等技术的发展，出现了与组件切片技术良好匹配的分体式接线盒(尤其是三分体接线盒)。
为了解决光伏组件失配的问题，在光伏组件的背板还会设有光伏功率变换器(也可以简称为功率变换器)。现有功率变换器一般采用外置式的，功率变换器和接线盒可以通过外部线缆进行连接。为了节省外部线缆，可以将功率变换器集成到接线盒里面去。然而对于分体式接线盒，功率变换器也变成了分体式功率变换器，即一个光伏组件中存在至少两个功率变换器。比如说，光伏组件背板设置的是三分体接线盒，将功率变换器集成到接线盒里面去之后，功率变换器也变成了三个(即三分体功率变换器)。此时，该光伏组件如何实现组件监控、组件IV扫描、组件关断等功能是重点研究的问题。
本申请的发明人在研究和实践过程中发现，在一个光伏组件背板设置的各个功率变换器之间相互独立。以图1中示出的三分体功率变换器为例，三个功率变换器分别独立与外部(例如逆变器)进行电力线载波(power line communication，PLC)通信，由逆变器来获取各个功率变换器的信息，控制该光伏组件实现组件监控、组件IV扫描、组件关断等功能。换句话来说，现有技术的每个功率变换器均要配备有PLC通信模块，PLC通信模块的制备成本比较高。
发明内容
本申请实施例提供了一种功率变换器盒及光伏系统，可以降低成本。
第一方面，本申请实施例提供了一种功率变换器盒，该功率变换器盒适用于包括至少两个光伏子串的光伏系统；该功率变换器盒包括至少两个功率变换器，其中，各个功率变换器的输入端与各自对应的光伏子串的输出端耦合，各个功率变换器的输出端串联耦合，且各个功率变换器的输出端串联耦合后的两端耦合至光伏系统中的逆变器；上述至少两个功率变换器包括一个主功率变换器和至少一个从功率变换器，即可以理解为本申请实施例中的功率变换器分为主功率变换器和从功率变换器，除了主功率变换器之外的其他功率变换器均为从功率变换器。主功率变换器可以采集主功率变换器对应的光伏子串的状态信息，从功率变换器可以采集该从功率变换器对应的光伏子串的状态信息，并且还可以将该从功率变换器对应的光伏子串的状态信息发送至主功率变换器。换句话来说，主功率变换器可以获取该从功率变换器对应的光伏子串的状态信息以及该主功率变换器对应的光伏子串的状态信息。主功率变换器可以将从功率变换器对应的光伏子串的状态信息以及该主功率变换器对应的光伏子串的状态信息发送至逆变器。本申请实施例中，主功率变换器与各个从功率变换器之间可以进行通信。各个功率变换器把各自对应的光伏子串的状态信息发送至主功率变换器，再由主功率变换器将该光伏组件的所有光伏子串的状态信息发送至逆变器。
结合第一方面，在第一种可能的实现方式中，每个功率变换器中均包括脉宽调制模块，上述主功率变换器与上述从功率变换器通过该脉宽调制模块进行通信。
结合第一方面第一种可能的实现方式，在第二种可能的实现方式中，上述从功率变换器中还包括第一开关模块，其中，上述从功率变换器通过该从功率变换器中的脉宽调制模块将该从功率变换器对应的光伏子串的状态信息生成第一脉宽信号，并将该第一脉宽信号发送至上述第一开关模块，以控制该第一开关模块的输出电压；该第一开关模块的输出电压携带该从功率变换器对应的光伏子串的状态信息；上述主功率变换器通过采集上述从功率变换器中的第一开关模块的输出电压来获取该从功率变换器对应的光伏子串的状态信息。
结合第一方面，在第三种可能的实现方式中，每个功率变换器中均包括至少一个红外模块；上述主功率变换器与上述从功率变换器通过该红外模块进行通信。
结合第一方面，在第四种可能的实现方式中，每个功率变换器中均包括至少一个串口通信模块；其中，各个功率变换器之间的串口通信模块通过隔离电容耦合；上述主功率变换器与上述从功率变换器通过该串口通信模块进行通信。
结合第一方面，在第五种可能的实现方式中，每个功率变换器中均包括至少一个电压平移模块；上述主功率变换器和上述从功率变换器通过该电压平移模块进行模拟通信。
结合第一方面或结合第一方面上述任意一种可能的实现方式，在第六种可能的实现方式中，各个上述光伏子串包括两个并联的子串单元，该两个并联的子串单元之间的并联点为该两个并联的子串单元所在光伏子串的输出端。实施本申请实施例，将光伏子串分为两个并联的子串单元，可以在保证相同功率输出的情况下，减少光伏子串的发热量。
结合第一方面或结合第一方面上述任意一种可能的实现方式，在第七种可能的实现方式中，各个功率变换器均具有正输出端和负输出端；上述第一从功率变换器包括第一从功率变换器和第二从功率变换器；上述各个功率变换器的输出端串联耦合具体实现为：该第一从功率变换器的正输出端耦合上述逆变器的正极输入端，该第一从功率变换器的负输出端耦合上述主功率变换器的正输出端，该主功率变换器的负输出端耦合上述第二从功率变换器的正输出端，该第二从功率变换器的负输出端耦合上述逆变器的负极输入端。换句话说，主功率变换器位于光伏系统中各个功率变换器的中间位置。实施本申请实施例，可以减少主功率变换器与各个从功率变换器之间的通信距离，提高通信效果。
结合第一方面，在第八种可能的实现方式中，上述主功率变换器可以通过上述PLC通信模块接收逆变器发送的控制信息，并根据该控制信息对该主功率变换器对应的光伏子串的输出功率进行控制；该控制信息为上述逆变器根据上述光伏组件中的至少一个光伏子串的状态信息生成的；上述主功率变换器还可以将该控制信息发送至从功率变换器；该从功率变换器可以根据该控制信息对该从功率变换器对应的光伏子串的输出功率进行控制。
第二方面，本申请实施例提供了一种功率变换器盒，该功率变换器盒包括至少两个光伏子串的光伏系统，该功率变换器盒包括至少两个功率变换器，其中，各个功率变换器的输入端与各自对应的光伏子串的输出端耦合，各个功率变换器的输出端串联耦合，且各个功率变换器的输出端串联耦合后的两端耦合至光伏系统中的逆变器；上述至少两个功率变换器包括一个主功率变换器和至少一个从功率变换器，即可以理解为本申请实施例中的功率变换器分为主功率变换器和从功率变换器，除了主功率变换器之外的其他功率变换器均 为从功率变换器。上述主功率变换器可以通过该主功率变换器中的电力线载波PLC通信模块接收逆变器发送的控制信息，并根据该控制信息对该主功率变换器对应的光伏子串的输出功率进行控制；上述主功率变换器还可以将该控制信息发送至从功率变换器；该从功率变换器可以根据该控制信息对该从功率变换器对应的光伏子串的输出功率进行控制。本申请实施例中，主功率变换器与各个从功率变换器之间可以进行通信。逆变器向光伏组件下发控制信息时，先由主功率变换器接收逆变器下发的控制信息，再由主功率变换器将该控制信息发送至各个从功率变换器。
结合第二方面，在第一种可能的实现方式中，每个功率变换器中均包括脉宽调制模块，上述主功率变换器与上述从功率变换器通过该脉宽调制模块进行通信。
结合第二方面第一种可能的实现方式，在第二种可能的实现方式中，上述主功率变换器中还包括第二开关模块，其中，该主功率变换器通过该主功率变换器中的脉宽调制模块将上述控制信息生成第二脉宽信号，并将该第二脉宽信号发送至上述第一开关模块，以控制该第二开关模块的输出电压；该第二开关模块的输出电压携带上述控制信息；上述从功率变换器通过采集上述主功率变换器中的第二开关模块的输出电压来获取上述控制信息。
结合第二方面，在第三种可能的实现方式中，每个功率变换器中均包括至少一个红外模块；上述主功率变换器与上述从功率变换器通过该红外模块进行通信。
结合第二方面，在第四种可能的实现方式中，每个功率变换器中均包括至少一个串口通信模块；其中，各个功率变换器之间的串口通信模块通过隔离电容耦合；上述主功率变换器与上述从功率变换器通过该串口通信模块进行通信。
结合第二方面，在第五种可能的实现方式中，每个功率变换器中均包括至少一个电压平移模块；上述主功率变换器和上述从功率变换器通过该电压平移模块进行模拟通信。
结合第二方面或结合第二方面上述任意一种可能的实现方式，在第六种可能的实现方式中，各个上述光伏子串包括两个并联的子串单元，该两个并联的子串单元之间的并联点为该两个并联的子串单元所在光伏子串的输出端。
结合第二方面或结合第二方面上述任意一种可能的实现方式，在第七种可能的实现方式中，各个功率变换器均具有正输出端和负输出端；上述第一从功率变换器包括第一从功率变换器和第二从功率变换器；上述各个功率变换器的输出端串联耦合具体实现为：该第一从功率变换器的正输出端耦合上述逆变器的正极输入端，该第一从功率变换器的负输出端耦合上述主功率变换器的正输出端，该主功率变换器的负输出端耦合上述第二从功率变换器的正输出端，该第二从功率变换器的负输出端耦合上述逆变器的负极输入端。
结合第二方面，在第八种可能的实现方式中，上述主功率变换器可以采集该主功率变换器对应的光伏子串信息；上述从功率变换器可以采集该从功率变换器对应的光伏子串的状态信息，并将该从功率变换器对应的光伏子串的状态信息发送至上述主功率变换器；该主功率变换器可以获取上述从功率变换器对应的光伏子串的状态信息，并通过上述PLC通信模块，将上述从功率变换器对应的光伏子串的状态信息和上述主功率变换器对应的光伏子串的状态信息发送至逆变器。
第三方面，本申请实施例提供了一种光伏系统，该光伏系统包括至少两个光伏子串、逆变器以及结合第一方面或结合第一方面任意一种可能的实现方式中的功率变换器盒，其 中，该至少两个光伏子串位于同一光伏组件中。
第四方面，本申请实施例提供了一种光伏系统，该光伏系统包括至少两个光伏子串、逆变器以及结合第二方面或结合第二方面任意一种可能的实现方式中的功率变换器盒；其中，该至少两个光伏子串位于同一光伏组件中。
应理解的是，本申请上述多个方面的实现和有益效果可以相互参考。
附图说明
图1为现有技术的三分体功率变换器的结构框图；
图2为本申请实施例提供的光伏系统的一结构框图；
图3为本申请实施例提供的光伏系统的一部分结构框图；
图4为本申请实施例提供的光伏系统的又一部分结构框图；
图5为本申请实施例提供的功率变换器盒的一结构框图；
图6为本申请实施例提供的光伏系统的一通信流程图；
图7为本申请实施例提供的光伏系统的又一通信流程图；
图8为本申请实施例提供的功率变换器盒的一通信结构框图；
图9为本申请实施例提供的功率变换器盒的又一通信结构框图；
图10为本申请实施例提供的功率变换器盒的又一通信结构框图；
图11为本申请实施例提供的功率变换器盒输出端的波形示意图；
图12为本申请实施例提供的功率变换器盒的又一通信结构框图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
下面结合附图对本申请实施例的实施作进一步的详细描述。
参见图2，图2为本申请实施例提供的光伏系统的一结构框图。如图2所示，光伏系统包括至少一个光伏组件(例如光伏组件201、光伏组件202、光伏组件203和光伏组件204等)和逆变器21，各个光伏组件相互之间可以串并联形成光伏组件阵列，以向逆变器21提供直流电，逆变器21可以将直流电转换为交流电。
示例性的，光伏组件201与光伏组件202串联耦合至逆变器21，向逆变器21输出第一直流电；光伏组件203与光伏组件204串联耦合至逆变器21，向逆变器21输出第二直流电。
需要指出的是，本申请中所描述的“耦合”指的是直接或间接连接。例如，A与B连接，既可以是A与B直接连接，也可以是A与B之间通过一个或多个其它电学元器件间接连接，例如可以是A与C直接连接，C与B直接连接，从而使得A与B之间通过C实现了连接。
比如说，在一些可行的实施方式中，各个光伏组件与逆变器21之间可以设置有开关、配电柜等。
在一些可行的实施方式中，每个光伏组件均可以对应设有功率变换器盒，例如光伏组件201的背板设有功率变换器盒1、光伏组件202的背板设有功率变换器盒2、光伏组件203的背板设有功率变换器盒3以及光伏组件204的背板设有功率变换器盒4等。示例性的，各个功率变换器盒可以包括至少两个功率变换器。
可选的，在一些可行的实施方式中，光伏系统中的部分光伏组件可以对应设有功率变换器盒，例如光伏组件201背板设有功率变换器盒1，光伏组件202、光伏组件203和光伏组件204背板没有设有功率变换器盒(图中未示出)。换句话来说，本申请实施例不对光伏系统中设有功率变换器盒的光伏组件的数量进行限制。
在一些可行的实施方式中，本申请实施例中的光伏组件为三分片，即每个光伏组件中包括三个光伏子串。例如，各个光伏子串的输出端与功率变换器的输入端一一耦合。又例如，多个光伏子串的输出端可以耦合至一个功率变换器的输入端，即多个光伏子串共用一个功率变换器。本申请实施例不对功率变换器对应光伏子串的数量进行限制。
本申请实施例中的功率变换器盒可以对光伏组件中的光伏子串进行最大功率跟踪(Maximum Power Point Tracking，MPPT)。具体实现中，功率变换器可以对光伏子串输出的电流电压进行检测，通过调节功率变换器中DC/DC变换电路(例如BUCK电路、BOOST电路或BUCK-BOOST电路等)的占空比来控制光伏子串输出最大功率。
可选的，本申请实施例中的功率变换器可以不具有上述MPPT功能，但具有关断功能。在光伏子串的工作出现异常时可以将该光伏子串与光伏系统的连接切断，避免该光伏子串影响光伏系统的工作。此时，该功率变换器可以理解为关断器。
需要说明的是，本申请实施例中的功率变换器盒包括至少两个功率变换器，该至少两个功率变换器包括一个主功率变换器和至少一个从功率变换器。
在本申请实施例中，主功率变换器与各个从功率变换器之间可以进行通信。比如说，逆变器向光伏组件下发控制信息时，先由主功率变换器接收逆变器下发的控制信息，再由主功率变换器将该控制信息发送至各个从功率变换器。又比如说，各个功率变换器向逆变器发送对应的光伏子串的状态信息时，各个从功率变换器先把对应的光伏子串的状态信息发送至主功率变换器，再由主功率变换器将光伏组件中所有光伏子串的状态信息发送至逆变器。实施本申请实施例，从功率变换器中无需配备对外通信模块，也无需连接通信线缆到逆变器，只需主功率变换器配备对外通信模块，从而可以降低功率变换器盒的制备成本。
下面以光伏组件201中设置功率变换器盒1为例对本申请实施例进行详细介绍。参见图3至图7。
首先参见图3，图3为本申请实施例提供的光伏系统的一部分结构框图。如图3所示，光伏组件201包括至少两个光伏子串(例如光伏子串2011、光伏子串2012和光伏子串2013等)；功率变换器盒1包括至少两个功率变换器，该至少两个功率变换器包括一个主功率变换器12和至少一个从功率变换器(例如从功率变换器11和从功率变换器13等)。
功率变换器与至少一个光伏子串之间具有对应关系，图3以一个光伏子串对应一个功率变换器为例。例如，光伏子串2011对应从功率变换器11，光伏子串2012对应主功率变换器12，光伏子串2013对应从功率变换器13。
各个功率变换器的输入端与各自对应的光伏子串的输出端耦合。其中，各个光伏子串分别具有两个输出端，各个功率变换器分别具有两个输入端。具体的，从功率变换器11的正输入端耦合光伏子串2011的正输出端，从功率变换器11的负输入端耦合光伏子串2011的负输出端。主功率变换器12的正输入端耦合光伏子串2012的正输出端，主功率变换器12的负输入端耦合光伏子串2012的负输出端。从功率变换器13的正输入端耦合光伏子串2013的正输出端，从功率变换器13的负输入端耦合光伏子串2013的负输出端。
在一些可行的实施方式中，参见图4，图4为本申请实施例提供的光伏系统的又一部分结构框图。如图4所示，各个光伏子串包括两个并联的子串单元，该两个并联的子串单元之间的并联点为该两个并联的子串单元所在光伏子串的输出端。示例性的，光伏子串2011包括子串单元2011-1和子串单元2011-2，子串单元2011-1与子串单元2011-2并联。子串单元2011-1的正输出端与子串单元2011-2的正输出端耦合至从功率变换器11的正输入端，子串单元2011-1的负输出端与子串单元2011-2的负输出端耦合至从功率变换器11的负输入端。同理的，子串单元2012-1的正输出端和子串单元2012-2的正输出端耦合至主功率变换器12的正输出端，子串单元2012-1的负输出端与子串单元2012-2的负输出端耦合至主功率变换器12的负输出端。子串单元2013-1的正输出端和子串单元2013-2的正输出端耦合至从功率变换器13的正输出端，子串单元2013-1的负输出端与子串单元2013-2的负输出端耦合至从功率变换器13的负输出端。实施本申请实施例，将光伏子串分为两个并联的子串单元，可以在保证相同功率输出的情况下，减少光伏子串的发热量。
各个功率变换器的输出端串联耦合，其中各个功率变换器分别具有正负两个输出端。可以理解的是，功率变换器的串联耦合为一个功率变换器的负输出端耦合另一个功率变换器的正输出端。示例性的，各个功率变换器的输出端串联耦合后的两端可以耦合至光伏系统中的逆变器21。在一些可行的实施方式中，可以是多个光伏组件中的多个功率变换器串联耦合后的两端耦合至光伏系统中的逆变器21。
在一些可行的实施方式中，以光伏系统中包括3个功率变换器为例，即光伏系统包括图3和图4中示出的从功率变换器11(即第一从功率变换器)、主功率变换器12和从功率变换器13(即第二从功率变换器)。具体的，第一从功率变换器的正输出端耦合光伏组件201的正输出端子PV1+(即逆变器21的正极输入端)，第一从功率变换器的负输出端耦合主功率变换器12的正输出端，主功率变换器12的负输出端耦合第二从功率变换器的正输出端，第二从功率变换器的负输出端耦合至光伏组件201的负输出端子PV1-(即耦合至逆变器21的负输入端)。换句话说，主功率变换器12位于光伏系统中各个功率变换器的中间位置。实施本申请实施例，可以减少主功率变换器与各个从功率变换器之间的通信距离，提高通信效果。
需要说明的是，本申请实施例中的主功率变换器也可以位于光伏系统中各个功率变换器的两侧位置(图中未示出)，本申请实施例不对主功率变换器的设置位置进行限制。
参见图5，图5为本申请实施例提供的功率变换器盒的一结构框图。如图5所示，各个功率变换器均具有两个输入端和两个输出端，例如从功率变换器11的正输入端为Vin1+，从功率变换器11的负输入端为Vin1-，从功率变换器11的正输出端为OUT1+，从功率变换器11的负输出端为OUT1-；主功率变换器12的正输入端为Vin2+，主功率变换器12的 负输入端为Vin2-，主功率变换器12的正输出端为OUT2+，主功率变换器12的负输出端为OUT2-；从功率变换器13的正输入端为Vin3+，从功率变换器13的负输入端为Vin3-，从功率变换器13的正输出端为OUT3+，从功率变换器13的负输出端为OUT3-。
各个功率变换器中均包含有功率变换模块和辅助电源，例如从功率变换器11中包括功率变换模块111和辅助电源113；主功率变换器12中包括功率变换模块121和辅助电源123；从功率变换器13中包括功率变换模块131和辅助电源133。
各个功率变换器中的功率变换模块可以是DC/DC变换电路，例如可以是BUCK电路、BOOST电路或BUCK-BOOST电路中的任意一种。各个功率变换器之间的功率变换模块的电路结构可以相同也可以不同，本申请实施例不对功率变换模块的具体电路结构进行限制。
各个功率变换器中的辅助电源的输入为各个功率变换器中的功率变换模块的输出。各个功率变换器中的辅助电源用于向各个功率变换器中的通信模块进行供电。
进一步的，各个功率变换器中还包括通信模块。例如，从功率变换器11中还包括第一通信模块112，主功率变换器12中还包括第二通信模块122，从功率变换器13中还包括第三通信模块132。则各个功率变换器中的电源供给关系如下：第一通信模块112由辅助电源113供电，辅助电源113的输入电源来自于功率变换模块111；第二通信模块122由辅助电源123供电，辅助电源123的输入电源来自于功率变换模块121；第三通信模块132由辅助电源133供电，辅助电源133的输入电源来自于功率变换模块131。
主功率变换器12可以通过第二通信模块122与各个从功率变换器进行通信。具体通信方式可以包括zigbee、WIFI、蓝牙或红外等无线通信方式；具体通信方式还可以包括电力线载波(power line communication，PLC)、RS485或集成电路总线(Inter-IntegratedCircuit，IIC)等有线通信方式。
在一些可行的实施方式中，参见图6，图6为本申请实施例提供的光伏系统的一通信流程图。如图6所示，本申请实施例中光伏系统的通信流程可以包括如下步骤：
S601、从功率变换器将自身对应的光伏子串的状态信息发送至主功率变换器。
光伏系统中的各个从功率变换器(例如从功率变换器11或从功率变换器13)采集各自对应的光伏子串的状态信息，比如该光伏子串的输出电流和/或输出电压等。
在一些可行的实施方式中，从功率变换器11将采集到光伏子串2011的状态信息发送至主功率变换器12时，还将从功率变换器11的身份标识向主功率变换器12发送；同理的，从功率变换器12将采集到光伏子串2012的身份标识向主功率变换器12发送。主功率变换器12可以基于各个从功率变换器发送的身份标识来识别各个从功率变换器对应的光伏子串的状态信息。
可选的，在一些可行的实施方式中，主功率变换器12可以按照预设的规则接收各个从功率变换器发送的光伏子串的状态信息。示例性的，主功率变换器12以查询的方式接收各个从功率变换器发送的光伏子串的状态信息。例如，主功率变换器12将光伏子串2011的状态信息记录在第一目标区域；主功率变换器12将光伏子串2013的状态信息记录在第二目标区域。主功率变换器12还进一步地将自身采集到的光伏子串2012的状态信息记录在第三目标区域。此时，主功率变换器12可以查询相应的目标区域来识别各个光伏子串的状态信息。
S602、主功率变换器将光伏组件中所有光伏子串的状态信息发送至逆变器。
主功率变换器12经过步骤S601可以获取到各个从功率变换器对应的光伏子串的状态信息，并且主功率变换器12还可以采集主功率变换器12对应的光伏子串2012的状态信息。换句话来说，主功率变换器12可以获取光伏组件中所有光伏子串的状态信息。需要说明的是，主功率变换器12采集光伏子串2012的状态信息可以在步骤S601之前，也可以在步骤S601与步骤S602之间，本申请实施例不对主功率变换器采集主功率变换器对应的光伏子串的状态信息的时间进行限制。
进一步的，主功率变换器中还包括对外通信模块124，主功率变换器12通过对外通信模块124将光伏组件中所有光伏子串(例如光伏子串2011、光伏子串2012和光伏子串2013等)的状态信息发送至逆变器。在一些可行的实施方式中，该对外通信模块124可以是电力线载波(power line communication，PLC)通信模块，主功率变换器12如何通过PLC通信模块向逆变器发送光伏组件中所有光伏子串的状态信息可以参考现有的PLC通信方式，此处不作赘述。
在本申请实施例中，主功率变换器与各个从功率变换器之间可以进行通信。各个功率变换器把各自对应的光伏子串的状态信息发送至主功率变换器，再由主功率变换器将该光伏组件的所有光伏子串的状态信息发送至逆变器。
进一步的，逆变器可以基于主功率变换器12发送的任意一个或多个光伏子串的状态信息生成控制信息，并将该控制信息下发至主功率变换器12。主功率变换器12可以基于该控制信息对主功率变换器12对应的光伏子串2012的输出功率进行控制。主功率变换器12还可以将该控制信息发送至各个从功率变换器，各个从功率变换器可以根据该控制信息对各自对应的光伏子串的输出功率进行控制。
可选的，在一些可行的实施方式中，参见图7，图7为本申请实施例提供的光伏系统的又一通信流程图。如图7所示，本申请实施例中光伏系统的通信流程可以包括如下步骤：
S701、主功率变换器接收逆变器发送的控制信息。
具体实现中，主功率变换器12通过对外通信模块124接收逆变器发送的控制信息。
在一些可行的实施方式中，逆变器可以接收光伏系统中的电站调度指令，并基于该电站调度指令生成控制信息。示例性的，该控制信息可以是光伏系统中各个光伏组件的目标功率参数，比如各个光伏组件的输出功率为目标有功功率100kw。
可选的，在一些可行的实施方式中，逆变器可以基于主功率变换器12发送的光伏组件中任意一个或多个光伏子串的状态信息生成控制信息。示例性的，逆变器可以根据光伏子串的输出电压/输出电流的大小，确定该光伏子串是否发生故障。比如说，在正常情况下光伏子串的输出电压为30V，若光伏子串的输出电压为10V，则表明该光伏子串发生故障，逆变器可以生成关断信号。
S702a、主功率变换器根据控制信息对主功率变换器对应的光伏子串的输出功率进行控制。
示例性的，主功率变换器12可以根据控制信息中携带的主功率变换器的身份标识获取逆变器下发给主功率变换器12的控制信息；或者，主功率变换器12可以从第二目标区域获取逆变器下发给主功率变换器12的控制信息。
在一些可行的实施方式中，主功率变换器12根据上述控制信息，调整功率变换器模块121中开关管的占空比，从而调整主功率变换器12对应的光伏子串2012的输出电压和/或输出电流。
可选的，在一些可行的实施方式中，主功率变换器12具有关断功能，当光伏子串2012发生故障时，逆变器生成控制信息(即第一关断信号)。主功率变换器12根据该第一关断信号将光伏子串2012向功率变换模块121输出直流电的回路关断，可以避免光伏子串2012对光伏系统产生影响。
S702b、主功率变换器将上述控制信息发送至各个从功率变换器。
需要说明的是，主功率变换器12执行步骤S702a和执行步骤S702b没有先后顺序，步骤S702a可以是与步骤S702b同时执行，步骤S702a也可以是在步骤S702b之前执行，步骤S702a也可以是在步骤S702b之后执行。
具体实现中，主功率变换器12将从逆变器接收到的控制信息转发至各个从功率变换器。
在一些可行的实施方式中，该控制信息中携带有各个功率变换器的身份标识，各个从功率变换器可以根据控制信息中携带的身份标识获取逆变器下发给各自的控制信息。
可选的，在一些可行的实施方式中，各个从功率变换器按照预设的规则从各自对应的目标区域获取逆变器下发给各自的控制信息。示例性的，从功率变换器11从第一目标区域获取逆变器下发给从功率变换器11的控制信息；从功率变换器13从第三目标区域获取逆变器下发给从功率变换器13的控制信息。
S703、从功率变换器根据上述控制信息对该从功率变换器对应的光伏子串的输出功率进行控制。
在一些可行的实施方式中，从功率变换器11可以根据上述控制信息，调整功率变换模块111中开关管的占空比，从而调整从功率变换器11对应的光伏子串2011的输出电压和/或输出电流。同理的，从功率变换器13也可以根据上述控制信息，调整功率变换模块131中开关管的占空比，从而调整从功率变换器13对应的光伏子串2013的输出电压和/或输出电流。
可选的，在一些可行的实施方式中，从功率变换器11和从功率变换器13具有关断功能。当光伏子串2011发生故障时，逆变器生成控制信息(即第二关断信号)，从功率变换器11根据该第二关断信号将光伏子串2011向功率变换模块111输出直流电的回路关断，可以避免光伏子串2011对光伏系统产生影响。同理的，当光伏子串2013发生故障时，逆变器生成控制信息(即第三关断信号)，从功率变换器13根据该第三关断信号将光伏子串2013向功率变换模块131输出直流电的回路关断，可以避免光伏子串2013对光伏系统产生影响。
在本申请实施例中，主功率变换器与各个从功率变换器之间可以进行通信。逆变器向光伏组件下发控制信息时，先由主功率变换器接收逆变器下发的控制信息，再由主功率变换器将该控制信息发送至各个从功率变换器。
综上所述，本申请实施例中的主功率变换器与各个从功率变换器之间可以进行通信，由主功率变换器负责对外通信(即与逆变器进行通信)，从功率变换器中无需配备对外通信模块，也无需连接通信线缆到逆变器，只需主功率变换器配备对外通信模块，连接通信线 缆到逆变器，可以降低功率变换器的制备成本，还可以降低光伏系统中线缆的使用成本。
本申请实施例中的主功率变换器与各个从功率变换器之间的通信方式可以是zigbee、WIFI、蓝牙或红外等无线通信方式，或者可以是PLC、RS485或IIC等有线通信方式。进一步的，主功率变换器与各个从功率变换器之间的通信方式还可以是无线通信方式与有线通信方式之间的组合，比如说主功率变换器与第一从功率变换器之间采用WIFI通信，主功率变换器与第二从功率变换器之间采用PCL通信等等。
以接线盒包括本申请实施例中的一个主功率变换器和两个从功率变换器为例，结合图8至图12对功率变换器盒中主功率变换器与各个从功率变换器之间的通信方式进行示例性介绍，而非穷举，应当理解为除了本申请实施例中记载的通信方式，还可以有其他的方式来实现主功率变换器与各个从功率变换器之间的通信。
在一些可行的实施方式中，参见图8，图8为本申请实施例提供的功率变换器盒的一通信结构框图。如图8所示，每个功率变换器中均包括至少一个红外模块，则主功率变换器与从功率变换器通过该红外模块进行通信。
示例性的，第一从功率变换器中包括第一红外模块81，主功率变换器中包括两个红外模块(例如第二红外模块82和第三红外模块83)，第二从功率变换器中包括第四红外模块84。其中第一红外模块81与第二红外模块82建立通信，第三红外模块83与第四红外模块84建立通信。
具体实现中，每个红外模块中分别包括红外发射模块和红外接收模块。
第一红外模块81中包括第一红外发射模块81a和第一红外接收模块81b；第二红外模块82中包括第二红外发射模块82a和第二红外接收模块82b。在一些可行的实施方式中，第一从功率变换器可以通过第一红外发射模块81a将第一从功率变换器对应的光伏子串的状态信息发送至主功率变换器中的第二红外接收模块82b。可选的，主功率变换器可以通过第二红外发射模块82a将逆变器下发的控制信息发送至第一从功率变换器中的第一红外接收模块81b。
同理的，第三红外模块83中包括第三红外发射模块83a和第三红外接收模块83b；第四红外模块84包括第四红外发射模块84a和第四红外接收模块84b。在一些可行的实施方式中，第二从功率变换器通过第四红外发射模块84a将第二从功率变换器对应的光伏子串的状态信息发送至主功率变换器中的第三红外接收模块83b。可选的，主功率变换器可以通过第三红外发射模块83a将逆变器下发的控制信息发送至第二从功率变换器中的第四红外接收模块84b。红外模块之间通信的具体实现可以参考现有技术，此处不作赘述。
可选的，在一些可行的实施方式中，参见图9，图9为本申请实施例提供的功率变换器盒的又一通信结构框图。如图9所示，每个功率变换器中均包括至少一个串口通信模块，其中各个功率变换器之间的串口通信模块通过隔离电容耦合，则主功率变换器与从功率变换器之间通过该串口通信模块进行通信。
示例性的，第一从功率变换器中包括第一串口通信模块901，主功率变换器中包括两个串口通信模块(例如第二串口通信模块902和第三串口通信模块903)，第二从功率变换器中包括第四串口通信模块904。其中第一串口通信模块901与第二串口通信模块902建 立通信，第三串口通信模块903与第四串口通信模块904建立通信。
具体实现中，第一串口通信模块901与第二串口通信模块902通过隔离电容C1和隔离电容C2耦合。可以理解的是，隔离电容C1和隔离电容C2在不同的通信回路上。比如说，隔离电容C1是在第一从功率变换器向主功率变换器发送信息的通信回路上，则隔离电容C2是在主功率变换器向第一从功率变换器发送信息的通信回路上，反之亦然。主功率变换器与各个从功率变换器分别位于独立的盒体里，即主功率变换器与各个从功率变换器不在同一参考地上，隔离电容(例如C1和C2)用于使第一从功率变换器与主功率变换器位于同一个参考地。
在一些可行的实施方式中，第一从功率变换器可以通过第一串口通信模块901将第一从功率变换器对应的光伏子串的状态信息发送至主功率变换器中的第二串口通信模块902。可选的，主功率变换器可以通过第二串口通信模块902将逆变器下发的控制信息发送至第一从功率变换器中的第一串口通信模块901。串口通信的具体实现可以参考现有技术，此处不作赘述。
同理的，第三串口通信模块903与第四串口通信模块904通过隔离电容C3和隔离电容C4耦合。隔离电容C3和隔离电容C4在不同的通信回路上，比如说，隔离电容C3是在第二从功率变换器向主功率变换器发送信息的通信回路上，则隔离电容C4在主功率变换器向第一从功率变换器发送信息的通信回路上，反之亦然。隔离电容(例如C3和C4)用于使第二从功率变换器与主功率变换器位于同一个参考地。
在一些可行的实施方式中，第二从功率变换器可以通过第四串口通信模块904将第二从功率变换器对应的光伏子串的状态信息发送至主功率变换器中的第三串口通信模块903。可选的，主功率变换器可以通过第三串口通信模块903将逆变器下发的控制信息发送至第二从功率变换器中的第四串口通信模块904。串口通信的具体实现可以参考现有技术，此处不作赘述。
可选的，在一些可行的实施方式中，参见图10，图10为本申请实施例提供的功率变换器盒的又一通信结构框图。如图10所示，每个功率变换器中均包括脉宽调制模块，则主功率变换器与从功率变换器之间通过该脉宽调制模块进行通信。
例如，第一从功率变换器中包括第一脉宽调制模块1015和第一开关模块1012。第一从功率变换器通过第一脉宽调制模块1015将从功率变换器对应的光伏子串的状态信息生成第一脉宽信号，并将该第一脉宽信号发送至第一开关模块1012，以控制第一开关模块1012的输出电压；第一开关模块1012的输出电压携带第一从功率变换器对应的光伏子串的状态信息。主功率变换器通过采集第一从功率变换器中的第一开关模块1012的输出电压来获取第一输出阻抗模块分别获取第一从功率变换器对应的光伏子串的状态信息。
具体实现中，第一从功率变换器中还包括第一输入阻抗模块1011、第一输出阻抗模块1013和第一功率调节模块1014，其中第一功率调节模块1014和第一脉宽调制模块1015为第一控制单元中的模块。第一从功率变换器对应的光伏子串的状态信息由第一输入阻抗模块1011感知，并传递至第一控制单元。第一控制单元中的第一功率调节模块1014用于调节第一从功率变换器对应的光伏子串的输出功率，实现该光伏子串的MPPT。可以理解的是，第一开关模块1012的输出电压由第一输出阻抗模块1013传递至耦合模块，该耦合模 块用于耦合所有功率变换器的输出电压从而进行信息传递。
进一步的，在从功率变换器向主功率变换器发送该从功率变换器对应的光伏子串的状态信息时，第一控制单元可以按照预先设置好的通信频率，控制第一脉宽调制模块1015基于该光伏子串的状态信息生成第一脉宽信号。比如说，在第一从功率变换器正常工作的情况下，输入电压为10V，占空比为50％，输出电压为5V。以光伏子串的状态信息是输出电流5A为例，第一控制单元可以按照预设通信频率例如1KHz在49％的占空比与51％的占空比之间切换，则第一开关模块1012的输出电压在4.9V与5.1V之间切换，切换时间为1ms切换一次。第一控制单元可以预先设置好触发切换的规则，例如光伏子串的状态信息为输出电流是5A，则第一从功率变换器需要向主功率变换器传输“0101”的二进制信号。若二进制信号为“1”则触发占空比切换，否则保持原来的50％的占空比。占空比的切换时长由主功率变换器的第二控制单元的采样频率确定。参见图11，图11为本申请实施例提供的功率变换器盒输出端的波形示意图。如图11所示，图11以第二控制单元的采样频率是200Hz为例，在主功率变换器采集到第一开关模块1012的输出电压在4.9V与5.1V之间切换时，确定此时信号为“1”，若主功率变换器采集到第一开关模块1012的输出电压是5V，则确定此时信号为“0”。则如图11中示出的波形携带的信号即为“0101”，可以表示第一从功率变换器对应的光伏子串的输出电流为5A。以图中第一从功率变换器为例对本申请实施例的从功率变换器进行示例性说明，可以理解为本申请实施例中其他功率变换器也可以实现如第一从功率变换器的功能。
又例如，主功率变换器中包括第二脉宽调制模块1025和第二开关模块1022。主功率变换器通过第二脉宽调制模块1025将逆变器下发的控制信息生成第二脉宽信号，并将该第二脉宽信号发送至第二开关模块1022，以控制第二开关模块1022的输出电压；第二开关模块1022的输出电压携带该控制信息。第一从功率变换器通过采集主功率变换器中的第二开关模块1022的输出电压来获取该控制信息。
具体实现中，主功率变换器中还包括第二输入阻抗模块1021、第二输出阻抗模块1023、第二功率调节模块1024、远程通信阻抗模块1026和远程通信模块1027，其中第二功率调节模块1024和第二脉宽调制模块1025为第二控制单元中的模块。第二控制单元中的第二功率调节模块1024可以调节主功率变换器对应的光伏子串的输出功率。
第二输入阻抗模块1021可以感知主功率变换器对应的光伏子串的状态信息，并传递至第二控制单元。
逆变器下发的控制信息先由远程通信阻抗模块1026感知，然后远程通信阻抗模块1026发送至远程通信模块1027(例如PLC通信模块)。远程通信模块1027将该控制信息传递至第二控制单元，第二控制单元可以按照预先设置好的通信频率控制第二脉宽调制模块1025基于该控制信息生成第二脉宽信号，控制第二开关模块1022的输出电压，第二开关模块1022的输出电压经过第二输出阻抗模块1023传递至耦合模块。具体的控制过程类似于前面结合图11所描述的第一从功率变换器的过程，此处不作赘述。第一从功率变换器的第一控制单元通过从耦合模块中获取第二开关模块1022的输出电压来获取上述控制信息。
参见图12，图12为本申请实施例提供的功率变换器盒的又一通信结构框图。如图12所示，每个功率变换器中均包括至少一个电压平移模块，例如第一从功率变换器中包括第 一电压平移模块1212，主功率变换器中包括第二电压平移模块1222，以及第二从功率变换器中包括第三电压平移模块1232。
示例性的，各个功率变换器中的电压平移模块可以耦合至同一通信线上，即第一电压平移模块1212、第二电压平移模块1222和第三电压平移模块1232耦合至同一通信线上。各个功率变换器中的电压平移模块可以按照目标电平值对接收到的模拟通信信号进行抬升。比如说，主功率变换器对应的光伏组串的输出电压为20V，则第一从功率变换器中的第一电压平移模块1212和第二从功率变换器中的第三电压平移模块1232将各自对应的光伏组串的状态信息的模拟通信信号抬升30V之后再向主功率变换器传输。又比如说，第一从功率变换器对应的光伏子串的输出电压为20V，则主功率变换器中的第二电压平移模块1222将逆变器下发的控制信息的模拟通信信号抬升30V之后再向第一从功率变换器发送。
可选的，各个功率变换器中的电压平移模块也可以耦合至不同的通信线上。即可以理解为各个功率变换器抬升的电压值不是同一个电压值。换句话来说，主功率变换器和从功率变换器可以通过电压平移模块进行模拟通信，而电压平移模块之间如何实现模拟通信可以参考现有技术中的电平移位通信，此处不作赘述。
可以理解的是，各个功率变换器中还包括功率变换模块，例如第一从功率变换器中包括第一功率变换模块1211，主功率变换器中包括第二功率变换模块1221，第二从功率变换器中包括第三功率变换模块1231。各个功率变换器中的功率变换模块可以对各自对应的光伏子串进行子串级别的MPPT。并且，主功率变换器中还包括远程通信模块1223(例如PLC通信模块)，可以接收逆变器下发的控制信息。
需要说明的是，上述术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性。
在本申请对单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，如：多个单元或组件可以结合，或可以集成到另一个系统，或一些特征可以忽略，或不执行。
上述作为分离部件说明的单元可以是、或也可以不是物理上分开的，作为单元显示的部件可以是、或也可以不是物理单元，即可以位于一个地方，也可以分布到多个网络单元上；可以根据实际的需要选择其中的部分或全部单元来实现本实施例方案的目的。
另外，在本发明各实施例中的各功能单元可以全部集成在一个处理单元中，也可以是各单元分别单独作为一个单元，也可以两个或两个以上单元集成在一个单元中；上述集成的单元既可以采用硬件的形式实现，也可以采用硬件加软件功能单元的形式实现。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以所述权利要求的保护范围为准。

Claims (20)

  1. 一种功率变换器盒，其特征在于，所述功率变换器盒适用于包括至少两个光伏子串的光伏系统；所述功率变换器盒包括至少两个功率变换器，其中，各个功率变换器的输入端与各自对应的光伏子串的输出端耦合，各个功率变换器的输出端串联耦合，且各个功率变换器的输出端串联耦合后的两端耦合至所述光伏系统中的逆变器；所述至少两个功率变换器包括一个主功率变换器和至少一个从功率变换器；
    所述主功率变换器，用于采集所述主功率变换器对应的光伏子串的状态信息；
    所述从功率变换器，用于采集所述从功率变换器对应的光伏子串的状态信息，并将所述从功率变换器对应的光伏子串的状态信息发送至所述主功率变换器；
    所述主功率变换器，还用于获取所述从功率变换器对应的光伏子串的状态信息，并通过所述主功率变换器中的电力线载波PLC通信模块，将所述从功率变换器对应的光伏子串的状态信息和所述主功率变换器对应的光伏子串的状态信息发送至所述逆变器。
  2. 根据权利要求1所述的功率变换器盒，其特征在于，每个功率变换器中均包括脉宽调制模块；所述主功率变换器与所述从功率变换器通过所述脉宽调制模块进行通信。
  3. 根据权利要求2所述的功率变换器盒，其特征在于，所述从功率变换器中还包括第一开关模块，其中，
    所述从功率变换器，用于通过所述从功率变换器中的脉宽调制模块将所述从功率变换器对应的光伏子串的状态信息生成第一脉宽信号，并将所述第一脉宽信号发送至所述第一开关模块，以控制所述第一开关模块的输出电压；所述第一开关模块的输出电压携带所述从功率变换器对应的光伏子串的状态信息；
    所述主功率变换器，用于通过采集所述从功率变换器中的第一开关模块的输出电压来获取所述从功率变换器对应的光伏子串的状态信息。
  4. 根据权利要求1所述的功率变换器盒，其特征在于，每个功率变换器中均包括至少一个红外模块；所述主功率变换器与所述从功率变换器通过所述红外模块进行通信。
  5. 根据权利要求1所述的功率变换器盒，其特征在于，每个功率变换器中均包括至少一个串口通信模块；其中，各个功率变换器之间的串口通信模块通过隔离电容耦合；
    所述主功率变换器与所述从功率变换器通过所述串口通信模块进行通信。
  6. 根据权利要求1所述的功率变换器盒，其特征在于，每个功率变换器中均包括电压平移模块；所述主功率变换器和所述从功率变换器通过所述电压平移模块进行模拟通信。
  7. 根据权利要求1-6任一项所述的功率变换器盒，其特征在于，各个所述光伏子串包括两个并联的子串单元；
    所述两个并联的子串单元之间的并联点为所述两个并联的子串单元所在光伏子串的输出端。
  8. 根据权利要求1-7任一项所述的功率变换器盒，其特征在于，各个功率变换器均具有正输出端和负输出端；所述至少一个从功率变换器包括第一从功率变换器和第二从功率变换器；
    所述各个功率变换器的输出端串联耦合为：
    所述第一从功率变换器的正输出端耦合所述逆变器的正极输入端，所述第一从功率变换器的负输出端耦合所述主功率变换器的正输出端，所述主功率变换器的负输出端耦合所述第二从功率变换器的正输出端，所述第二从功率变换器的负输出端耦合所述逆变器的负极输入端。
  9. 根据权利要求1所述的功率变换器盒，其特征在于，所述主功率变换器，还用于通过所述PLC通信模块接收所述逆变器发送的控制信息，并根据所述控制信息对所述主功率变换器对应的光伏子串的输出功率进行控制；所述控制信息为所述逆变器根据所述光伏组件中的至少一个光伏子串的状态信息生成的；
    所述主功率变换器，还用于将所述控制信息发送至所述从功率变换器；
    所述从功率变换器，还用于根据所述控制信息对所述从功率变换器对应的光伏子串的输出功率进行控制。
  10. 一种功率变换器盒，其特征在于，所述功率变换器盒适用于包括至少两个光伏子串的光伏系统；所述功率变换器盒包括至少两个功率变换器，其中，各个功率变换器的输入端与各自对应的光伏子串的输出端耦合，各个功率变换器的输出端串联耦合，且各个功率变换器的输出端串联耦合后的两端耦合至所述光伏系统中的逆变器；所述至少两个功率变换器包括一个主功率变换器和至少一个从功率变换器；
    所述主功率变换器，用于通过所述主功率变换器中的电力线载波PLC通信模块接收所述逆变器发送的控制信息，并根据所述控制信息对所述主功率变换器对应的光伏子串的输出功率进行控制；
    所述主功率变换器，还用于将所述控制信息发送至所述从功率变换器；
    所述从功率变换器，用于根据所述控制信息对所述从功率变换器对应的光伏子串的输出功率进行控制。
  11. 根据权利要求10所述的功率变换器盒，其特征在于，每个功率变换器中均包括脉宽调制模块；所述主功率变换器与所述从功率变换器通过所述脉宽调制模块进行通信。
  12. 根据权利要求11所述的功率变换器盒，其特征在于，所述主功率变换器中还包括第二开关模块，其中，
    所述主功率变换器，用于通过所述主功率变换器中的脉宽调制模块将所述控制信息生 成第二脉宽信号，并将所述第二脉宽信号发送至所述第二开关模块，以控制所述第二开关模块的输出电压；所述第二开关模块的输出电压携带所述控制信息；
    所述从功率变换器，用于通过采集所述主功率变换器中的第二开关模块的输出电压来获取所述控制信息。
  13. 根据权利要求10所述的功率变换器盒，其特征在于，每个功率变换器中均包括至少一个红外模块；所述主功率变换器与所述从功率变换器通过所述红外模块进行通信。
  14. 根据权利要求10所述的功率变换器盒，其特征在于，每个功率变换器中均包括至少一个串口通信模块；其中，各个功率变换器之间的串口通信模块通过隔离电容耦合；
    所述主功率变换器与所述从功率变换器通过所述串口通信模块进行通信。
  15. 根据权利要求10所述的功率变换器盒，其特征在于，每个功率变换器中均包括电压平移模块；所述主功率变换器和所述从功率变换器通过所述电压平移模块进行模拟通信。
  16. 根据权利要求10-15任一项所述的光伏系统，其特征在于，各个所述光伏子串包括两个并联的子串单元；
    所述两个并联的子串单元之间的并联点为所述两个并联的子串单元所在光伏子串的输出端。
  17. 根据权利要求10-16任一项所述的光伏系统，其特征在于，各个功率变换器均具有正输出端和负输出端；所述至少一个从功率变换器包括第一从功率变换器和第二从功率变换器；
    所述各个功率变换器的输出端串联耦合为：
    所述第一从功率变换器的正输出端耦合所述逆变器的正极输入端，所述第一从功率变换器的负输出端耦合所述主功率变换器的正输出端，所述主功率变换器的负输出端耦合所述第二从功率变换器的正输出端，所述第二从功率变换器的负输出端耦合所述逆变器的负极输入端。
  18. 根据权利要求10所述的光伏系统，其特征在于，所述主功率变换器，还用于采集所述主功率变换器对应的光伏子串信息；
    所述从功率变换器，还用于采集所述从功率变换器对应的光伏子串的状态信息，并将所述从功率变换器对应的光伏子串的状态信息发送至所述主功率变换器；
    所述主功率变换器，还用于获取所述从功率变换器对应的光伏子串的状态信息，并通过所述PLC通信模块，将所述从功率变换器对应的光伏子串的状态信息和所述主功率变换器对应的光伏子串的状态信息发送至所述逆变器。
  19. 一种光伏系统，其特征在于，所述光伏系统包括至少两个光伏子串、逆变器以及 如权利要求1-9任一项所述的功率变换器盒；其中，所述至少两个光伏子串位于同一光伏组件中。
  20. 一种光伏系统，其特征在于，所述光伏系统包括至少两个光伏子串、逆变器以及如权利要求10-18任一项所述的功率变换器盒；其中，所述至少两个光伏子串位于同一光伏组件中。
PCT/CN2021/091739 2021-04-30 2021-04-30 一种功率变换器盒及光伏系统 WO2022227083A1 (zh)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP21938556.4A EP4322400A4 (en) 2021-04-30 2021-04-30 POWER CONVERTER BOX AND PHOTOVOLTAIC SYSTEM
PCT/CN2021/091739 WO2022227083A1 (zh) 2021-04-30 2021-04-30 一种功率变换器盒及光伏系统
CN202180096847.2A CN117157875A (zh) 2021-04-30 2021-04-30 一种功率变换器盒及光伏系统
US18/496,226 US20240063754A1 (en) 2021-04-30 2023-10-27 Power Converter Box and Photovoltaic System

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2021/091739 WO2022227083A1 (zh) 2021-04-30 2021-04-30 一种功率变换器盒及光伏系统

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US18/496,226 Continuation US20240063754A1 (en) 2021-04-30 2023-10-27 Power Converter Box and Photovoltaic System

Publications (1)

Publication Number Publication Date
WO2022227083A1 true WO2022227083A1 (zh) 2022-11-03

Family

ID=83847549

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2021/091739 WO2022227083A1 (zh) 2021-04-30 2021-04-30 一种功率变换器盒及光伏系统

Country Status (4)

Country Link
US (1) US20240063754A1 (zh)
EP (1) EP4322400A4 (zh)
CN (1) CN117157875A (zh)
WO (1) WO2022227083A1 (zh)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110245989A1 (en) * 2010-04-02 2011-10-06 Tigo Energy Systems and Methods for Mapping the Connectivity Topology of Local Management Units in Photovoltaic Arrays
CN106487422A (zh) * 2016-09-07 2017-03-08 国家电网公司 用于光伏组件之间的直流单导线载波通信方式
CN106817075A (zh) * 2017-02-28 2017-06-09 阳光电源股份有限公司 一种光伏接线盒和光伏系统
CN108199747A (zh) * 2018-01-04 2018-06-22 哈尔滨理工大学 一种直流光伏电力载波通讯装置
CN109245712A (zh) * 2017-07-03 2019-01-18 北京信邦同安电子有限公司 太阳能组件及其分体式功率优化接线盒
CN110190672A (zh) * 2019-06-05 2019-08-30 南京智睿能源互联网研究院有限公司 一种基于LoRa通讯的智能用电检测装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009032288A1 (de) * 2009-07-09 2011-01-13 Kostal Industrie Elektrik Gmbh Photovoltaikanlage
US9431825B2 (en) * 2011-07-28 2016-08-30 Tigo Energy, Inc. Systems and methods to reduce the number and cost of management units of distributed power generators
DE102014105985A1 (de) * 2014-04-29 2015-10-29 Sma Solar Technology Ag Wandlermodul zur Umwandlung elektrischer Leistung und Wechselrichter für eine Photovoltaikanlage mit mindestens zwei Wandlermodulen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110245989A1 (en) * 2010-04-02 2011-10-06 Tigo Energy Systems and Methods for Mapping the Connectivity Topology of Local Management Units in Photovoltaic Arrays
CN106487422A (zh) * 2016-09-07 2017-03-08 国家电网公司 用于光伏组件之间的直流单导线载波通信方式
CN106817075A (zh) * 2017-02-28 2017-06-09 阳光电源股份有限公司 一种光伏接线盒和光伏系统
CN109245712A (zh) * 2017-07-03 2019-01-18 北京信邦同安电子有限公司 太阳能组件及其分体式功率优化接线盒
CN108199747A (zh) * 2018-01-04 2018-06-22 哈尔滨理工大学 一种直流光伏电力载波通讯装置
CN110190672A (zh) * 2019-06-05 2019-08-30 南京智睿能源互联网研究院有限公司 一种基于LoRa通讯的智能用电检测装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4322400A4 *

Also Published As

Publication number Publication date
EP4322400A4 (en) 2024-09-11
US20240063754A1 (en) 2024-02-22
EP4322400A1 (en) 2024-02-14
CN117157875A (zh) 2023-12-01

Similar Documents

Publication Publication Date Title
US20200144933A1 (en) Distributed voltage source inverters
CN102810909B (zh) 一种可实现分布式电源与负载匹配的能量管理方法
AU2019262602B2 (en) Systems and methods of DC power conversion and transmission for solar fields
WO2011008944A4 (en) Smart and scalable power inverters
CN102780267B (zh) 一种电能路由器
US11323786B2 (en) General purpose single chip controller
WO2021057268A1 (zh) 一种逆变器、汇流箱以及光伏系统
CN101551446A (zh) 一种能馈型电源老化系统
CN105576814A (zh) 直流电源备援系统
CN104734181B (zh) 光伏并网系统
CN203466837U (zh) 一种网络摄像机的供电装置
CN210007670U (zh) 光伏功率优化系统
WO2022217457A1 (zh) 一种供电系统及拓扑检测方法
CN105720913A (zh) 太阳能光伏组件用安全断开接线盒及电站系统
WO2022227083A1 (zh) 一种功率变换器盒及光伏系统
KR101703727B1 (ko) 태양광발전의 최대효율을 위한 출력 보상시스템
CN105353821A (zh) 光伏功率优化器和光伏发电系统
CN104682859A (zh) 一种基于直流光伏模块的光伏发电系统拓扑结构
CN105429587B (zh) 一种太阳能电站组串级功率优化器
CN104377827B (zh) 一种光伏直流电源
CN105226921B (zh) 隔离型dc/dc控制器、双向变换器控制系统及控制方法
CN210629545U (zh) 通信协议转换器、能量变换装置和新能源电厂
WO2018146556A1 (en) A general purpose single chip controller
CN204188999U (zh) 基于校园用电设备的智能化供电系统
CN214674940U (zh) 模块化逆变系统

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21938556

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2021938556

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2021938556

Country of ref document: EP

Effective date: 20231107

NENP Non-entry into the national phase

Ref country code: DE