CN111555261B - Photovoltaic module based on passive connector - Google Patents
Photovoltaic module based on passive connector Download PDFInfo
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- CN111555261B CN111555261B CN202010397283.3A CN202010397283A CN111555261B CN 111555261 B CN111555261 B CN 111555261B CN 202010397283 A CN202010397283 A CN 202010397283A CN 111555261 B CN111555261 B CN 111555261B
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- 230000005540 biological transmission Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000000295 complement effect Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000010354 integration Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/12—Parallel operation of dc generators with converters, e.g. with mercury-arc rectifier
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/36—Electrical components characterised by special electrical interconnection means between two or more PV modules, e.g. electrical module-to-module connection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The application discloses a photovoltaic module based on a passive connector, wherein the negative electrode of a first photovoltaic sub-module is sequentially connected with the positive electrode of a second photovoltaic sub-module and one end of an inductor, one end of a first capacitor is connected with the public end of a photovoltaic unit of the first photovoltaic sub-module, the other end of the first capacitor is sequentially connected with the other end of the inductor and one end of a second capacitor, the other end of the second capacitor is connected with the public end of the photovoltaic unit of the second photovoltaic sub-module, the first capacitor, the second capacitor and the inductor form the passive connector, when power of each photovoltaic unit is lost due to different local shadows, ageing degrees, installation angles and the like, the passive connector realizes differential power transfer when power of different photovoltaic sub-modules is lost, the different sub-modules are guaranteed to have equal output currents, the power acquisition rate of a photovoltaic system is improved, and the loss of the system where the photovoltaic module is located is reduced.
Description
Technical Field
The application relates to the technical field of power electronic converters and control, in particular to a photovoltaic module based on a passive connector.
Background
A photovoltaic module is a device for converting solar energy into electric energy, and is used in applications where solar energy is used to generate electricity, such as a solar power plant, a solar street lamp, and the like. The main current use form of the photovoltaic is centralized power generation, namely photovoltaic modules (PV modules) are connected in series and in parallel to obtain a photovoltaic array (PV array), and after high enough output voltage and current are ensured, a high-power centralized grid-connected inverter is used for carrying out Maximum Power Point Tracking (MPPT) and grid-connected control. However, the method has obvious disadvantages that the input voltage with extremely wide variation range requires a device with high withstand voltage and high on-resistance, and the DC voltage utilization rate of the inverter at the later stage is low, so that the efficiency of the inverter is low; in addition, due to the influences of factors such as local shadows, deviation of installation angles of photovoltaic cell modules, dust, electric parameter differences and the like, in the photovoltaic array, voltage and current at the Maximum Power Point (MPP) of each cell module output cannot be consistent, so that the output power of the photovoltaic array is limited to the photovoltaic module with the minimum power, the phenomenon is called power mismatch, the loss of power is more than 30% when serious, hot spots are generated on the photovoltaic module after long-term operation, and the module is burnt.
Considering the issues of power transmission paths and device withstand voltage, photovoltaic cell-based structures preferably constitute photovoltaic sub-modules within a limited number of cells. At present, researches on photovoltaic DPP mainly focus on DPP converter processing power optimal control, sub-module distributed MPPT and module level DPP converter minimum power tracking, flexible multi-target MPPT, reliability analysis, topology structure optimization, control strategy optimization and the like, and no literature is found to specially study how to connect sub-modules to realize independent control between the sub-modules and reduce energy coupling relation with other sub-modules. Some researchers respectively connect photovoltaic modules and DPP converters in series to obtain voltages matched with loads, but when power mismatch occurs between two sub-modules separated by a plurality of units, the switch capacitance efficiency becomes very low, so the method is only suitable for occasions with low voltages and fewer serial sub-modules. In addition, the DPP scheme of a photovoltaic-isolated bus (PV-IB) is adopted for research, each photovoltaic module is connected in series, the output ends of the DPP converters are connected in parallel, when the power of the photovoltaic sub-modules is in power mismatch, energy only flows in the DPP converters corresponding to the photovoltaic sub-modules with different powers, the DPP converters are smaller in processing power, but the reference voltage of each photovoltaic sub-module is 1/N of the total output voltage of the photovoltaic (N is the total quantity of the sub-modules), and the complexity of control is increased sharply along with the increase of the quantity of the cascaded photovoltaic modules. In addition, there are studies on the scheme that the photovoltaic sub-module is connected in series with the DPP converter and is connected in series with other units as a whole. When the power of the photovoltaic cell is mismatched, the processing power of the DPP converter is smaller, but because of the serial connection relation of the DPP converter and the photovoltaic cell, even if the power mismatch exists between the photovoltaic sub-modules, the DPP converter can flow the current equal to the photovoltaic sub-modules, and the loss of the system where the corresponding photovoltaic modules are located is increased.
Disclosure of Invention
Aiming at the problem that when power is lost to photovoltaic sub-modules, the photovoltaic modules formed by directly connecting the photovoltaic sub-modules in series can have power loss.
A photovoltaic module based on a passive connector comprises a first photovoltaic sub-module, a second photovoltaic sub-module, a first capacitor, a second capacitor and an inductor;
the negative electrode of the first photovoltaic sub-module is sequentially connected with the positive electrode of the second photovoltaic sub-module and one end of the inductor, one end of the first capacitor is connected with the photovoltaic unit public end of the first photovoltaic sub-module, the other end of the first capacitor is sequentially connected with the other end of the inductor and one end of the second capacitor, and the other end of the second capacitor is connected with the photovoltaic unit public end of the second photovoltaic sub-module.
Specifically, the positive electrode of the first photovoltaic sub-module is the positive electrode of the photovoltaic module; the negative electrode of the second photovoltaic sub-module is the negative electrode of the photovoltaic module.
Specifically, the first photovoltaic sub-module and the second photovoltaic sub-module each comprise 8 switching tubes, and driving signals of the switching tubes keep adjacent complementary principles.
In the photovoltaic module based on the passive connector, the negative electrode of the first photovoltaic sub-module is sequentially connected with the positive electrode of the second photovoltaic sub-module and one end of the inductor, one end of the first capacitor is connected with the photovoltaic unit common end of the first photovoltaic sub-module, the other end of the first capacitor is sequentially connected with the other end of the inductor and one end of the second capacitor, the other end of the second capacitor is connected with the photovoltaic unit common end of the second photovoltaic sub-module, the first capacitor, the second capacitor and the inductor form the passive connector, when power of each photovoltaic unit is lost due to different local shadows, ageing degrees, installation angles and the like, the passive connector realizes differential power transfer when power is lost among different photovoltaic sub-modules, equal output currents of different sub-modules are guaranteed, the power acquisition rate of a photovoltaic system is improved, and the loss of the system where the photovoltaic module is located is reduced.
Drawings
FIG. 1 is a schematic diagram of a photovoltaic sub-module;
FIG. 2 is a schematic diagram of a passive connector-based photovoltaic module structure according to one embodiment;
FIG. 3 is a circuit block diagram of a passive connector-based photovoltaic module of one embodiment;
fig. 4 is a passive connector-based photovoltaic module simulation waveform of one embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
In one embodiment, a passive connector-based photovoltaic module is provided that includes a first photovoltaic sub-module, a second photovoltaic sub-module, a first capacitor, a second capacitor, and an inductance;
the negative electrode of the first photovoltaic sub-module is sequentially connected with the positive electrode of the second photovoltaic sub-module and one end of the inductor, one end of the first capacitor is connected with the photovoltaic unit public end of the first photovoltaic sub-module, the other end of the first capacitor is sequentially connected with the other end of the inductor and one end of the second capacitor, and the other end of the second capacitor is connected with the photovoltaic unit public end of the second photovoltaic sub-module.
Specifically, the positive electrode of the first photovoltaic sub-module is the positive electrode of the photovoltaic module; the negative electrode of the second photovoltaic sub-module is the negative electrode of the photovoltaic module.
Specifically, the first photovoltaic sub-module and the second photovoltaic sub-module each comprise 8 switching tubes, and driving signals of the switching tubes keep adjacent complementary principles.
In the photovoltaic module based on the passive connector, the negative electrode of the first photovoltaic sub-module is sequentially connected with the positive electrode of the second photovoltaic sub-module and one end of the inductor, one end of the first capacitor is connected with the photovoltaic unit common end of the first photovoltaic sub-module, the other end of the first capacitor is sequentially connected with the other end of the inductor and one end of the second capacitor, the other end of the second capacitor is connected with the photovoltaic unit common end of the second photovoltaic sub-module, the first capacitor, the second capacitor and the inductor form the passive connector, when power of each photovoltaic unit is lost due to different local shadows, ageing degrees, installation angles and the like, the passive connector realizes differential power transfer when power is lost among different photovoltaic sub-modules, equal output currents of different sub-modules are guaranteed, the power acquisition rate of a photovoltaic system is improved, and the loss of the system where the photovoltaic module is located is reduced.
In one embodiment, the first photovoltaic sub-module and the second photovoltaic sub-module are both photovoltaic sub-modules based on a capacitance-free voltage equalizer. The photovoltaic sub-module based on a capacitance-free voltage equalizer is shown in fig. 1, and the meaning of the symbol name in fig. 1 includes: pvs+ represents the photovoltaic sub-module anode; PVS-represents the photovoltaic sub-module negative pole; PV (photovoltaic) system C1 -PV C16 Representing a first photovoltaic unit through a sixteenth photovoltaic unit in the photovoltaic sub-module; s is S C1 -S C8 Representing a first switching tube to an eighth switching tube in the photovoltaic sub-module; pvsa+ represents the first photovoltaic sub-module anode; PVSa-represents the first photovoltaic sub-module negative electrode; PVSb+ represents the positive electrode of the second photovoltaic submodule; PVSb-represents the second photovoltaic sub-module negative electrode; l (L) 1 Representing inductance; PV (photovoltaic) system Ca -PV Ch Representing first to eighth photovoltaic units in the photovoltaic sub-module; PV (photovoltaic) system Ca1 -PV Ca16 Representing first through sixteenth photovoltaic units in the first photovoltaic sub-module; s is S Ca1 -S Ca8 Representing first to eighth switching tubes in the first photovoltaic sub-module; PV (photovoltaic) system Cb1 -PV Cb16 Represent the firstThe first photovoltaic unit to the sixteenth photovoltaic unit in the two photovoltaic sub-modules; s is S Cb1 -S Cb8 Representing the first switching tube to the eighth switching tube in the second photovoltaic sub-module; i.e PVa Representing the current flowing through the first photovoltaic sub-module; i.e PVb Representing the current flowing through the second photovoltaic sub-module; i.e L1 Representing the current through the inductor. The photovoltaic sub-module comprises 16 photovoltaic units and 8 switching tubes, wherein the 16 photovoltaic units are divided into 8 groups, namely PV C1 -PV C2 First photovoltaic unit group and PV C3 -PV C4 Second photovoltaic unit group and PV C5 -PV C6 Third photovoltaic unit group and PV C7 -PV C8 Fourth photovoltaic unit group and PV C9 -PV C11 Fifth photovoltaic unit group and PV C12 Sixth photovoltaic unit group and PV C13 Seventh photovoltaic unit group and PV C14 -PV C16 And forming an eighth photovoltaic unit group. The drive signals of two adjacent switching tubes are complementary, and the duty ratio is 50%. When power mismatch exists between any two groups of photovoltaic units, the two groups of photovoltaic units with differential power form a loop channel for transmitting the differential power through a switching tube, and when the power mismatch exists between the photovoltaic unit groups, each group of photovoltaic units operates at the respective maximum power point.
When two photovoltaic sub-modules are required to be connected in series to obtain a photovoltaic module with higher voltage, if the two sub-modules with power mismatch are directly connected in series, the whole photovoltaic module can generate larger power loss for external output, and in order to solve the problem, the embodiment provides the photovoltaic module based on the passive connector shown in the figure 2, which comprises a first photovoltaic sub-module, a second photovoltaic sub-module and the passive connector; the passive connector includes a first capacitor (e.g., capacitor C in FIG. 2) 1 ) A second capacitor (e.g. capacitor C in FIG. 2) 2 ) And an inductance; the first photovoltaic sub-module and the second photovoltaic sub-module respectively comprise 3 connecting ends, namely a positive electrode, a negative electrode and a photovoltaic unit common end; the negative electrode of the first photovoltaic sub-module, the positive electrode of the second photovoltaic sub-module and one end of the inductor are connected together; one end of the first capacitor is connected toA photovoltaic cell common of the first photovoltaic sub-module; the other end of the first capacitor, the other end of the inductor and one end of the second capacitor are connected together; the other end of the second capacitor is connected to the common end of the photovoltaic units of the second photovoltaic sub-module; the anode of the first photovoltaic sub-module and the cathode of the second photovoltaic sub-module are respectively used as the anode and the cathode of the photovoltaic module.
The passive connector utilizes the capacitance to transmit differential power between the sub-modules on one hand, and utilizes the inductance to balance instantaneous current difference between the two sub-modules on the other hand, so that the normal operation of the photovoltaic module is ensured.
Fig. 3 shows a circuit diagram of a photovoltaic module formed by two complete photovoltaic sub-modules and a passive connector, wherein the two photovoltaic sub-modules are respectively provided with 8 switching tubes, and the driving signals of the switching tubes still keep adjacent complementation principle; the 16 switching tubes in the two groups of photovoltaic sub-modules are still each divided into 8 groups of photovoltaic modules, namely PV Ca1 -PV Ca2 First sub-module first photovoltaic unit group and PV Ca3 -PV Ca4 First sub-module second photovoltaic unit group and PV Ca5 -PV Ca6 First sub-module third photovoltaic unit group and PV Ca7 -PV Ca8 First sub-module, fourth photovoltaic unit group and PV Ca9 -PV Ca11 First sub-module, fifth photovoltaic unit group and PV Ca12 First sub-module sixth photovoltaic unit group and PV Ca13 Seventh photovoltaic unit group and PV of first submodule Ca14 -PV Ca16 An eighth photovoltaic unit group of the first sub-module is formed; PV (photovoltaic) system Cb1 -PV Cb2 Second sub-module first photovoltaic unit group and PV Cb3 -PV Cb4 Second sub-module second photovoltaic unit group and PV Cb5 -PV Cb6 A second sub-module, a third photovoltaic unit group and a PV Cb7 -PV Cb8 Second sub-module fourth photovoltaic unit group and PV Cb9 -PV Cb11 A fifth photovoltaic unit group and a PV of a second sub-module Cb12 Second sub-module sixth photovoltaic unit group and PV Cb13 Seventh photovoltaic unit group and PV of second submodule Cb14 -PV Cb16 And the second sub-module and the eighth photovoltaic unit group are formed. S in two sub-modules Cai (i＝1,3,5,7)、S Cbi When the switching tubes in (i=1, 3,5, 7) are simultaneously turned on, 16 differential power transmission loops can be formed between the submodules, and the differential power transmission loops are respectively as follows:
1. the second sub-module, the fifth photovoltaic unit group, the first switching tube of the second sub-module, the fourth photovoltaic unit group of the first sub-module, the seventh switching tube of the first sub-module, the eighth photovoltaic unit group of the first sub-module, the first capacitor and the second capacitor;
2. the second sub-module fifth photovoltaic unit group, the second sub-module first switch tube, the first sub-module fourth photovoltaic unit group, the first sub-module third photovoltaic unit group, the first sub-module fifth switch tube, the first sub-module seventh photovoltaic unit group, the first capacitor and the second capacitor;
3. the second sub-module fifth photovoltaic unit group, the second sub-module first switching tube, the first sub-module fourth photovoltaic unit group, the first sub-module third photovoltaic unit group, the first sub-module second photovoltaic unit group, the first sub-module third switching tube, the first sub-module sixth photovoltaic unit group, the first capacitor and the second capacitor;
4. the second sub-module fifth photovoltaic unit group, the second sub-module first switching tube, the first sub-module fourth photovoltaic unit group, the first sub-module third photovoltaic unit group, the first sub-module second photovoltaic unit group, the first sub-module first switching tube, the first sub-module fifth photovoltaic unit group, the first capacitor and the second capacitor;
5. the second sub-module, the sixth photovoltaic unit group, the third switching tube of the second sub-module, the first photovoltaic unit group of the second sub-module, the fourth photovoltaic unit group of the first sub-module, the seventh switching tube of the first sub-module, the eighth photovoltaic unit group of the first sub-module, the first capacitor and the second capacitor;
6. the second sub-module, the sixth photovoltaic unit group, the second sub-module, the third switching tube, the second sub-module, the first photovoltaic unit group, the first sub-module, the fourth photovoltaic unit group, the first sub-module, the third photovoltaic unit group, the first sub-module, the fifth switching tube, the first sub-module, the seventh photovoltaic unit group, the first capacitor and the second capacitor;
7. the second sub-module, the sixth photovoltaic unit group, the second sub-module, the third switching tube, the second sub-module, the first photovoltaic unit group, the first sub-module, the fourth photovoltaic unit group, the first sub-module, the third photovoltaic unit group, the first sub-module, the second photovoltaic unit group, the first sub-module, the third switching tube, the first sub-module, the sixth photovoltaic unit group, the first capacitor and the second capacitor;
8. the second sub-module sixth photovoltaic unit group, the second sub-module third switching tube, the second sub-module first photovoltaic unit group, the first sub-module fourth photovoltaic unit group, the first sub-module third photovoltaic unit group, the first sub-module second photovoltaic unit group, the first sub-module first switching tube, the first sub-module fifth photovoltaic unit group, the first capacitor and the second capacitor;
9. the second sub-module, the seventh photovoltaic unit group, the second sub-module, the fifth switching tube, the second sub-module, the second photovoltaic unit group, the first sub-module, the fourth photovoltaic unit group, the first sub-module, the seventh switching tube, the first sub-module, the eighth photovoltaic unit group, the first capacitor and the second capacitor;
10. the second sub-module, the seventh photovoltaic unit group, the second sub-module, the fifth switching tube, the second sub-module, the second photovoltaic unit group, the second sub-module, the first photovoltaic unit group, the first sub-module, the fourth photovoltaic unit group, the first sub-module, the third photovoltaic unit group, the first sub-module, the fifth switching tube, the first sub-module, the seventh photovoltaic unit group, the first capacitor and the second capacitor;
11. the second sub-module, the seventh photovoltaic unit group, the second sub-module, the fifth switching tube, the second sub-module, the second photovoltaic unit group, the second sub-module, the first photovoltaic unit group, the first sub-module, the fourth photovoltaic unit group, the first sub-module, the third photovoltaic unit group, the first sub-module, the second photovoltaic unit group, the first sub-module, the third switching tube, the first sub-module, the sixth photovoltaic unit group, the first capacitor and the second capacitor;
12. the seventh photovoltaic unit group of the second sub-module, the fifth switching tube of the second sub-module, the second photovoltaic unit group of the second sub-module, the first photovoltaic unit group of the second sub-module, the fourth photovoltaic unit group of the first sub-module, the third photovoltaic unit group of the first sub-module, the second photovoltaic unit group of the first sub-module, the first switching tube of the first sub-module, the fifth photovoltaic unit group of the first sub-module, the first capacitor and the second capacitor;
13. the second sub-module eighth photovoltaic unit group, the second sub-module seventh switching tube, the second sub-module third photovoltaic unit group, the second sub-module second photovoltaic unit group, the second sub-module first photovoltaic unit group, the first sub-module fourth photovoltaic unit group, the first sub-module seventh switching tube, the first sub-module eighth photovoltaic unit group, the first capacitor and the second capacitor;
14. the second sub-module eighth photovoltaic unit group, the second sub-module seventh switching tube, the second sub-module third photovoltaic unit group, the second sub-module second photovoltaic unit group, the second sub-module first photovoltaic unit group, the first sub-module fourth photovoltaic unit group, the first sub-module third photovoltaic unit group, the first sub-module fifth switching tube, the first sub-module seventh photovoltaic unit group, the first capacitor and the second capacitor;
15. the second sub-module eighth photovoltaic unit group, the second sub-module seventh switching tube, the second sub-module third photovoltaic unit group, the second sub-module second photovoltaic unit group, the second sub-module first photovoltaic unit group, the first sub-module fourth photovoltaic unit group, the first sub-module third photovoltaic unit group, the first sub-module second photovoltaic unit group, the first sub-module third switching tube, the first sub-module sixth photovoltaic unit group, the first capacitor and the second capacitor;
16. the second sub-module eighth photovoltaic cell group, the second sub-module seventh switching tube, the second sub-module third photovoltaic cell group, the second sub-module second photovoltaic cell group, the second sub-module first photovoltaic cell group, the first sub-module fourth photovoltaic cell group, the first sub-module third photovoltaic cell group, the first sub-module second photovoltaic cell group, the first sub-module first switching tube, the first sub-module fifth photovoltaic cell group, the first capacitor and the second capacitor;
s in two sub-modules Cai (i＝2,4,6,8)、S Cbi When the switching tubes in (i=2, 4,6, 8) are simultaneously turned on, 16 differential power transmission loops can be formed between the submodules (the first photovoltaic submodule and the second photovoltaic submodule), and the differential power transmission loops are respectively as follows:
1. the second sub-module, the fifth photovoltaic unit group, the second sub-module, the second switching tube, the second sub-module, the first photovoltaic unit group, the eighth switching tube, the first sub-module, the eighth photovoltaic unit group, the first capacitor and the second capacitor;
2. the second sub-module, the fifth photovoltaic unit group, the second sub-module, the second switching tube, the first photovoltaic unit group of the second sub-module, the fourth photovoltaic unit group of the first sub-module, the sixth switching tube of the first sub-module, the seventh photovoltaic unit group of the first sub-module, the first capacitor and the second capacitor;
3. the second sub-module fifth photovoltaic unit group, the second sub-module second switching tube, the second sub-module first photovoltaic unit group, the first sub-module fourth photovoltaic unit group, the first sub-module third photovoltaic unit group, the first sub-module fourth switching tube, the first sub-module sixth photovoltaic unit group, the first capacitor and the second capacitor;
4. the second sub-module fifth photovoltaic unit group, the second sub-module second switching tube, the second sub-module first photovoltaic unit group, the first sub-module fourth photovoltaic unit group, the first sub-module third photovoltaic unit group, the first sub-module second switching tube, the first sub-module fifth photovoltaic unit group, the first capacitor and the second capacitor;
5. the second sub-module, the sixth photovoltaic unit group, the fourth switching tube of the second sub-module, the second photovoltaic unit group of the second sub-module, the first photovoltaic unit group of the second sub-module, the eighth switching tube of the first sub-module, the eighth photovoltaic unit group of the first sub-module, the first capacitor and the second capacitor;
6. the second sub-module, the sixth photovoltaic unit group, the fourth switching tube of the second sub-module, the second photovoltaic unit group of the second sub-module, the first photovoltaic unit group of the second sub-module, the fourth photovoltaic unit group of the first sub-module, the sixth switching tube of the first sub-module, the seventh photovoltaic unit group of the first sub-module, the first capacitor and the second capacitor;
7. the second sub-module sixth photovoltaic unit group, the second sub-module fourth switching tube, the second sub-module second photovoltaic unit group, the second sub-module first photovoltaic unit group, the first sub-module fourth photovoltaic unit group, the first sub-module third photovoltaic unit group, the first sub-module fourth switching tube, the first sub-module sixth photovoltaic unit group, the first capacitor and the second capacitor;
8. the second sub-module sixth photovoltaic unit group, the second sub-module fourth switching tube, the second sub-module second photovoltaic unit group, the second sub-module first photovoltaic unit group, the first sub-module fourth photovoltaic unit group, the first sub-module third photovoltaic unit group, the first sub-module second switching tube, the first sub-module fifth photovoltaic unit group, the first capacitor and the second capacitor;
9. the second sub-module, the seventh photovoltaic unit group, the sixth switching tube of the second sub-module, the third photovoltaic unit group of the second sub-module, the second photovoltaic unit group of the second sub-module, the first photovoltaic unit group of the second sub-module, the eighth switching tube of the first sub-module, the eighth photovoltaic unit group of the first sub-module, the first capacitor and the second capacitor;
10. the second sub-module, the seventh photovoltaic unit group, the second sub-module, the sixth switching tube, the second sub-module, the third photovoltaic unit group, the second sub-module, the second photovoltaic unit group, the second sub-module, the first photovoltaic unit group, the first sub-module, the fourth photovoltaic unit group, the first sub-module, the sixth switching tube, the first sub-module, the seventh photovoltaic unit group, the first capacitor and the second capacitor;
11. the second sub-module, the seventh photovoltaic unit group, the second sub-module, the sixth switching tube, the second sub-module, the third photovoltaic unit group, the second sub-module, the second photovoltaic unit group, the second sub-module, the first photovoltaic unit group, the first sub-module, the fourth photovoltaic unit group, the first sub-module, the third photovoltaic unit group, the first sub-module, the fourth switching tube, the first sub-module, the sixth photovoltaic unit group, the first capacitor and the second capacitor;
12. the second sub-module, the seventh photovoltaic unit group, the second sub-module, the sixth switching tube, the second sub-module, the third photovoltaic unit group, the second sub-module, the second photovoltaic unit group, the second sub-module, the first photovoltaic unit group, the first sub-module, the fourth photovoltaic unit group, the first sub-module, the third photovoltaic unit group, the first sub-module, the second switching tube, the first sub-module, the fifth photovoltaic unit group, the first capacitor and the second capacitor;
13. the second sub-module eighth photovoltaic unit group, the second sub-module eighth switching tube, the second sub-module fourth photovoltaic unit group, the second sub-module third photovoltaic unit group, the second sub-module second photovoltaic unit group, the second sub-module first photovoltaic unit group, the first sub-module eighth switching tube, the first sub-module eighth photovoltaic unit group, the first capacitor and the second capacitor;
14. the second sub-module eighth photovoltaic unit group, the second sub-module eighth switching tube, the second sub-module fourth photovoltaic unit group, the second sub-module third photovoltaic unit group, the second sub-module second photovoltaic unit group, the second sub-module first photovoltaic unit group, the first sub-module fourth photovoltaic unit group, the first sub-module sixth switching tube, the first sub-module seventh photovoltaic unit group, the first capacitor and the second capacitor;
15. the second sub-module eighth photovoltaic unit group, the second sub-module eighth switching tube, the second sub-module fourth photovoltaic unit group, the second sub-module third photovoltaic unit group, the second sub-module second photovoltaic unit group, the second sub-module first photovoltaic unit group, the first sub-module fourth photovoltaic unit group, the first sub-module third photovoltaic unit group, the first sub-module fourth switching tube, the first sub-module sixth photovoltaic unit group, the first capacitor and the second capacitor;
16. the second sub-module eighth photovoltaic cell group, the second sub-module eighth switching tube, the second sub-module fourth photovoltaic cell group, the second sub-module third photovoltaic cell group, the second sub-module second photovoltaic cell group, the second sub-module first photovoltaic cell group, the first sub-module fourth photovoltaic cell group, the first sub-module third photovoltaic cell group, the first sub-module second switching tube, the first sub-module fifth photovoltaic cell group, the first capacitor and the second capacitor;
the 16 loops in each of the two switching modes ensure that the photovoltaic module can perform energy balance transmission when the power of the submodule is not matched, thereby ensuring that the photovoltaic module has higher power acquisition rate.
In addition, the role of the inductance in the passive connector is mainly to balance the instantaneous power difference between the two sub-modules. In order to verify the effectiveness of the photovoltaic module based on the passive connector on the balanced differential power, a photovoltaic module corresponding to the circuit structure of fig. 3 in this embodiment is established, the average value of the current waveforms of the two modules is shown in fig. 4, and when the simulation is performed, the output power between the two sub-modules is different. It can be seen that at steady state, the average of the output currents of the two sub-modules is equal, indicating that the passive connector of the present application can balance the mismatch power between the sub-modules.
In summary, according to the embodiment, on the basis of the photovoltaic sub-modules, only two capacitors and one inductor are added, so that the photovoltaic sub-modules can be integrated into the photovoltaic module, the photovoltaic module can automatically balance mismatch power among the sub-modules, a higher photovoltaic power acquisition rate is ensured, and the cost recovery period of the photovoltaic system is shortened; the passive element is matched with the switch tube in the photovoltaic sub-module, so that the integration of the photovoltaic module is facilitated, and the integration cost can be reduced.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
It should be noted that, the term "first\second\third" related to the embodiment of the present application is merely to distinguish similar objects, and does not represent a specific order for the objects, it is to be understood that "first\second\third" may interchange a specific order or sequence where allowed. It is to be understood that the "first\second\third" distinguishing aspects may be interchanged where appropriate to enable embodiments of the application described herein to be implemented in sequences other than those illustrated or described.
The terms "comprising" and "having" and any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, apparatus, article, or device that comprises a list of steps or modules is not limited to the particular steps or modules listed and may optionally include additional steps or modules not listed or inherent to such process, method, article, or device.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (1)
1. The photovoltaic module based on the passive connector is characterized by comprising a first photovoltaic sub-module, a second photovoltaic sub-module and the passive connector, wherein the passive connector consists of a first capacitor, a second capacitor and an inductor;
the negative electrode of the first photovoltaic sub-module is sequentially connected with the positive electrode of the second photovoltaic sub-module and one end of the inductor, one end of the first capacitor is connected with the public end of the photovoltaic unit of the first photovoltaic sub-module, the other end of the first capacitor is sequentially connected with the other end of the inductor and one end of the second capacitor, and the other end of the second capacitor is connected with the public end of the photovoltaic unit of the second photovoltaic sub-module;
the first photovoltaic sub-module comprises a first photovoltaic unit, a second photovoltaic unit, a third photovoltaic unit, a fourth photovoltaic unit, a fifth photovoltaic unit, a sixth photovoltaic unit, a seventh photovoltaic unit, an eighth photovoltaic unit, a ninth photovoltaic unit, a tenth photovoltaic unit, an eleventh photovoltaic unit, a twelfth photovoltaic unit, a thirteenth photovoltaic unit, a fourteenth photovoltaic unit, a fifteenth photovoltaic unit and a sixteenth photovoltaic unit, a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, a sixth switching tube, a seventh switching tube and an eighth switching tube; the anode of the first photovoltaic unit and the drain electrode of the first switch tube are connected and used as the anode of the whole first photovoltaic sub-module, the cathode of the first photovoltaic unit is connected with the anode of the second photovoltaic unit, the source electrode of the second switch tube and the drain electrode of the third switch tube are connected together, the source electrode of the first switch tube, the drain electrode of the second switch tube and the anode of the ninth photovoltaic unit are connected together, the cathode of the third photovoltaic unit is connected with the anode of the fourth photovoltaic unit, the cathode of the fourth photovoltaic unit, the anode of the fifth photovoltaic unit, the source electrode of the fourth switch tube and the drain electrode of the fifth switch tube are connected together, the source electrode of the third switch tube, the drain electrode of the fourth switch tube and the anode of the twelfth photovoltaic unit are connected together, the cathode of the fifth photovoltaic unit is connected with the anode of the sixth photovoltaic unit, the cathode of the sixth photovoltaic unit, the anode of the seventh photovoltaic unit, the source of the sixth switching tube and the drain of the seventh switching tube are connected together, the source of the fifth switching tube, the drain of the sixth switching tube and the cathode of the thirteenth photovoltaic unit are connected together, the cathode of the seventh photovoltaic unit is connected with the anode of the eighth photovoltaic unit, the source of the seventh switching tube, the drain of the eighth switching tube and the cathode of the fourteenth photovoltaic unit are connected together, the cathode of the ninth photovoltaic unit is connected with the anode of the tenth photovoltaic unit, the cathode of the tenth photovoltaic unit is connected with the anode of the eleventh photovoltaic unit, the cathode of the eleventh photovoltaic unit, the anode of the thirteenth photovoltaic unit and the anode of the sixteenth photovoltaic unit are connected together and serve as a common terminal of the photovoltaic units of the first photovoltaic submodule, the cathode of the fifteenth photovoltaic unit is connected with the anode of the fourteenth photovoltaic unit, the negative electrode of the sixteenth photovoltaic unit is connected with the positive electrode of the fifteenth photovoltaic unit, and the negative electrode of the eighth photovoltaic unit and the source electrode of the eighth switching tube are connected together and serve as the negative electrode of the whole first photovoltaic sub-module;
the second photovoltaic sub-module comprises a first photovoltaic unit, a second photovoltaic unit, a third photovoltaic unit, a fourth photovoltaic unit, a fifth photovoltaic unit, a sixth photovoltaic unit, a seventh photovoltaic unit, an eighth photovoltaic unit, a ninth photovoltaic unit, a tenth photovoltaic unit, an eleventh photovoltaic unit, a twelfth photovoltaic unit, a thirteenth photovoltaic unit, a fourteenth photovoltaic unit, a fifteenth photovoltaic unit and a sixteenth photovoltaic unit, a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, a sixth switching tube, a seventh switching tube and an eighth switching tube; the cathode of the first photovoltaic unit is connected with the anode of the second photovoltaic unit, the anode of the first photovoltaic unit and the drain electrode of the first switch tube are connected and serve as the anode of the whole second photovoltaic sub-module, the cathode of the second photovoltaic unit, the anode of the third photovoltaic unit, the source of the second switch tube and the drain electrode of the third switch tube are connected together, the source of the first switch tube, the drain electrode of the second switch tube and the anode of the ninth photovoltaic unit are connected together, the cathode of the third photovoltaic unit is connected with the anode of the fourth photovoltaic unit, the cathode of the fourth photovoltaic unit, the anode of the fifth photovoltaic unit, the source of the fourth switch tube and the drain electrode of the fifth switch tube are connected together, the source of the third switch tube, the drain electrode of the fourth switch tube and the anode of the twelfth photovoltaic unit are connected together, the cathode of the fifth photovoltaic unit is connected with the anode of the sixth photovoltaic unit, the cathode of the sixth photovoltaic unit, the anode of the seventh photovoltaic unit, the source of the sixth switching tube and the drain of the seventh switching tube are connected together, the source of the fifth switching tube, the drain of the sixth switching tube and the cathode of the thirteenth photovoltaic unit are connected together, the cathode of the seventh photovoltaic unit is connected with the anode of the eighth photovoltaic unit, the source of the seventh switching tube, the drain of the eighth switching tube and the cathode of the fourteenth photovoltaic unit are connected together, the cathode of the ninth photovoltaic unit is connected with the anode of the tenth photovoltaic unit, the cathode of the tenth photovoltaic unit is connected with the anode of the eleventh photovoltaic unit, the cathode of the eleventh photovoltaic unit, the anode of the thirteenth photovoltaic unit and the anode of the sixteenth photovoltaic unit are connected together and serve as the common end of the photovoltaic units of the second photovoltaic sub-module, the cathode of the sixteenth photovoltaic unit is connected with the anode of the fifteenth photovoltaic unit, the negative electrode of the fifteenth photovoltaic unit is connected with the positive electrode of the fourteenth photovoltaic unit, and the negative electrode of the eighth photovoltaic unit and the source electrode of the eighth switching tube are connected together and serve as the negative electrode of the whole second photovoltaic sub-module;
the positive electrode of the first photovoltaic sub-module is the positive electrode of the photovoltaic module; the negative electrode of the second photovoltaic sub-module is the negative electrode of the photovoltaic module.
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| CN105227128A (en) * | 2015-09-25 | 2016-01-06 | 中国电力科学研究院 | A kind of Novel photovoltaic Modular multilevel converter and control method thereof |
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| CN106169874A (en) * | 2016-08-24 | 2016-11-30 | 上海交通大学 | The commutator transformer of buck conversion can be realized |
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