CN108233405B - Current self-tracking photovoltaic module - Google Patents
Current self-tracking photovoltaic module Download PDFInfo
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- CN108233405B CN108233405B CN201711191458.XA CN201711191458A CN108233405B CN 108233405 B CN108233405 B CN 108233405B CN 201711191458 A CN201711191458 A CN 201711191458A CN 108233405 B CN108233405 B CN 108233405B
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 40
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 40
- 239000010703 silicon Substances 0.000 claims abstract description 40
- 238000004146 energy storage Methods 0.000 claims abstract description 34
- 239000003990 capacitor Substances 0.000 claims abstract description 33
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 230000000903 blocking effect Effects 0.000 claims 1
- 230000005611 electricity Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 230000000737 periodic effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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- H02J3/385—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Photovoltaic Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a current self-tracking photovoltaic module, which comprises a solar silicon wafer string Vc, an energy storage capacitor C, a controllable switch n and a logic control unit of a fly-wheel diode D, LCU, wherein the energy storage capacitor C, the controllable switch n and the logic control unit of the fly-wheel diode D, LCU form a CMU unit together, and the CMU unit can automatically track the current of a main loop when the current of the solar silicon wafer string Vc is mismatched under special conditions through the reasonable arrangement of the connection of electronic devices and the periodic charging and discharging work, so that the current self-matching among the modules is realized, and the MPPT function of a system is realized. The solar silicon wafer string Vc does not need molecular string protection, is completely compatible with the existing centralized junction box assembly manufacturing process, reduces the number of aluminum wiring lines in the actual process and improves the production efficiency.
Description
Technical Field
The invention relates to a novel photovoltaic power generation assembly photo-generated current intelligent tracking and matching assembly based on a photovoltaic cell intelligent management unit (CMU), in particular to a current self-tracking photovoltaic assembly.
Background
The crystalline silicon (single crystal and polycrystal) photovoltaic power generation is widely applied, the photovoltaic power generation is based on PN junction, the photovoltaic voltage of a single cell is only 0.55v-0.75v, so that the standard component is mainly formed by connecting a plurality of cells in series. The existing 60 pieces of 156mm (156.75 mmx156.75mm +/-0.25 mm) modules are connected in series by 20 pieces to form a group of strings, and the three groups of strings are connected in series to form 60 pieces of serial modules; the current 72-piece modules are also connected in series by 24 pieces to form a group of strings, and the three groups of strings are connected in series to form 72 pieces of series modules. And the assembly is reversely added with a bypass diode from head to tail so as to provide a current path of a main loop in series connection when the string current is mismatched.
Fig. 5 of the accompanying drawings belongs to a conventional photovoltaic module structure, in which, when some cells in a certain string are smaller than a main loop current due to factors such as shading, contamination, or performance attenuation, and a bypass diode is turned on, the cells in the string with mismatching of the photo-generated current will bear a reverse voltage bias superimposed on the other cells in the string, as shown in fig. 6, taking a bias of a certain cell in a 20-string, Vs +19Vc = -Vd, Vs = - (19 Vc + Vd), and depending on the shading degree, the Vs value is about-12V, and the reverse bias voltage causes the cell to leak reversely and generate heat, forming a hot spot phenomenon, and the thermal stress will cause the performance attenuation and the effective life of the cell to decrease; if the voltage causes the reverse breakdown of the battery plate, the battery plate is burnt, and serious fire hazard is caused. That is to say, in the conventional assembly structure, when the power loss of each group of strings is caused by factors such as shielding, the shielded group of strings cannot generate power, but hot spots are caused, and light people can cause performance attenuation in different degrees and serious fire hidden trouble.
Meanwhile, due to the limitation of the reverse withstand voltage value of the battery piece (the withstand voltage of a single crystal 156 battery piece is tested by-12V/-50 mA from a factory), the serial number of the sub-string battery pieces of the traditional assembly cannot be too large, when the serial number exceeds a certain number (for example, 40 battery pieces, the reverse voltage value of the shielded battery piece is-24V), the PN junction of the shielded battery piece can be broken down by the overhigh reverse voltage, so that the battery piece is permanently disabled, and a great fire hazard is generated. At present, no current self-tracking photovoltaic module is designed through a photovoltaic cell group inter-string intelligent management unit (CMU), so that when photovoltaic power loss of a group string occurs, the group string does not enter a hot spot state, mismatch current is stored and then led into a main loop, and the generated energy of the system under the factors of shielding and the like is increased.
Disclosure of Invention
The invention aims at the technical problems, and provides a current self-tracking photovoltaic module which prevents a hot spot state from entering when photovoltaic power loss of a string is distributed through the design of a CMU (complementary processing unit) between photovoltaic cell strings, stores mismatched current and then guides the mismatched current into a main loop, and increases system power generation amount under factors such as shielding.
The invention realizes the purpose through the following technical scheme:
the current self-tracking photovoltaic module comprises a solar silicon wafer group string voltage Vc, an energy storage capacitor C, a controllable switch n and a fly-wheel diode D, LCU logic control unit, and is characterized in that the energy storage capacitor C is connected with the solar silicon wafer group string voltage Vc in parallel and then connected with the controllable switch n in series, the LCU logic control unit is powered by the solar silicon wafer group string voltage Vc in series, and samples the voltage Vc change of the solar silicon wafer group string voltage to form a logic control signal (on/off) to drive the controllable switch n (on/off). The energy storage capacitor C, the controllable switch n and the logic control unit of the follow current diode D, LCU jointly form a CMU unit. The number of the solar silicon wafer group string voltage Vc is N = 10-100. Under a normal state, the photovoltaic current Vc of the solar silicon wafer group string is consistent with the current Ic of the main loop, the controllable control n switch is connected, and the module follows the system MPPT to generate power and output normally. When the voltage Vc of the solar silicon wafer group string Is blocked and the like to cause the reduction of the photo-generated current Is of the solar silicon wafer group string Is smaller than the main loop current Ic, Vinl Is obtained when the voltage Vin at two ends of the parallel energy storage capacitor C Is reduced to a preset voltage value, the controllable switch n Is timely disconnected, the freewheeling diode D provides a freewheeling path for the main loop current Ic, and after the controllable switch n Is disconnected, the voltage Vc of the solar silicon wafer group string which Is blocked and the like to cause the reduction of the photo-generated current Is continuously charges and stores energy by taking the current Is as the energy storage capacitor C. When the charging voltage Vin of the energy storage capacitor C Is close to the normal voltage of the string (Vinh = N × Vc), the control switch N Is communicated again, the energy storage capacitor C discharges by Ics and Is connected in parallel with the photo-generated current Is of the voltage Vc of the solar silicon wafer string, the energy storage capacitor C discharges along with the main loop current Ic, and Ics + Is = Ic; when the voltage Vin of the energy storage capacitor C Is reduced to the preset voltage value Vinl after discharging, the controllable switch n Is switched off timely, and the voltage Vc of the solar silicon wafer set charges the energy storage capacitor C again by using the current Is for storing energy.
According to the invention, the energy storage capacitor C, the controllable switch n and the logic control unit of the freewheeling diode D, LCU are combined to form the CMU, the connection of each electronic device is reasonably set, and the CMU can automatically track the main loop current when the current mismatch caused by the solar silicon wafer string Vc under special conditions is completed through periodic charging and discharging work, so that the current self-matching among the components is realized, and the MPPT function of the system is realized. The series voltage Vc of the solar silicon wafer group does not need molecular series protection, is completely compatible with the existing centralized junction box assembly manufacturing process, reduces the number of aluminum wire lines in the actual process and improves the production efficiency.
Drawings
FIG. 1 is a schematic view of the interconnect structure of the device of the present invention.
FIG. 2 is a diagram illustrating a normal state of the present invention.
Fig. 3 is a schematic diagram illustrating the charging state of the energy storage electric energy C under an abnormal condition of the present invention.
FIG. 4 is a schematic diagram of the discharge state of the stored energy C under abnormal conditions of the present invention.
Fig. 5 is a diagram of a current standard string structure.
Fig. 6 is a heat spot phenomenon of a certain group of battery plates in a string of a conventional assembly.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The current self-tracking photovoltaic module comprises a solar silicon wafer group string voltage Vc, an energy storage capacitor C, a controllable switch n and a follow current diode D, LCU logic control unit, and is characterized in that the energy storage capacitor C is connected with the solar silicon wafer group string voltage Vc in parallel and then connected with the controllable switch n in series, the LCU logic control unit is powered by the solar silicon wafer group string voltage Vc in series, and the voltage change of the solar silicon wafer group string voltage Vc is sampled to form a logic control signal (on/off) to drive the controllable switch n (on/off). The energy storage capacitor C, the controllable switch n and the logic control unit of the continuous current diode D, LCU jointly form a CMU unit. The number of the solar silicon wafer group string voltage Vc is N = 10-100. Under a normal state, the photovoltaic current Vc of the solar silicon wafer group string is consistent with the current Ic of the main loop, the controllable n switch is communicated, and the module follows the system MPPT to generate power and output normally. When the voltage Vc of the solar silicon wafer set string Is blocked and the like to cause the reduction of the photo-generated current Is of the solar silicon wafer set string Is smaller than the current Ic of the main loop, Vinl Is formed when the voltage Vin at two ends of the parallel energy storage capacitor C Is reduced to a preset voltage value, the controllable switch n Is timely disconnected, the freewheeling diode D provides a freewheeling path for the current Ic of the main loop, and after the controllable switch n Is disconnected, the voltage Vc of the solar silicon wafer set string which Is blocked and the like to cause the reduction of the photo-generated current Is continues to charge and store energy for the energy storage capacitor C by using the current Is. When the charging voltage Vin of the energy storage capacitor C Is close to the normal voltage of the string (Vinh = N × Vc), the control switch N Is communicated again, the energy storage capacitor C discharges by Ics and Is connected in parallel with the photo-generated current Is of the voltage Vc of the solar silicon wafer string, the energy storage capacitor C discharges along with the main loop current Ic, and Ics + Is = Ic; when the voltage Vin of the energy storage capacitor C Is reduced to the preset voltage value Vinl after discharging, the controllable switch n Is switched off timely, and the solar silicon wafer string Vc charges the energy storage capacitor C again to store energy by using the current Is.
According to the invention, the energy storage capacitor C, the controllable switch n and the logic control unit of the freewheeling diode D, LCU are combined to form the CMU, the connection of each electronic device is reasonably set, and the CMU can automatically track the main loop current when the current mismatch caused by the solar silicon wafer string Vc under special conditions is completed through periodic charging and discharging work, so that the current self-matching among the components is realized, and the MPPT function of the system is realized. The series voltage Vc of the solar silicon wafer group does not need molecular series protection, is completely compatible with the existing centralized junction box assembly manufacturing process, reduces the number of aluminum wire lines in the actual process and improves the production efficiency.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may include only a single embodiment, and such description is for clarity only, and those skilled in the art will be able to make the description as a whole, and the embodiments may be suitably combined to form other embodiments as will be apparent to those skilled in the art.
Claims (1)
1. The current self-tracking photovoltaic module comprises a solar silicon wafer group string voltage Vc, an energy storage capacitor C, a controllable switch N and a fly-wheel diode D, LCU logic control unit, and is characterized in that the energy storage capacitor C is connected with the solar silicon wafer group string voltage Vc in parallel and then connected with the controllable switch N in series, the LCU logic control unit is powered by the solar silicon wafer group string voltage Vc in series, the voltage change of the solar silicon wafer group string voltage Vc is sampled to form a logic control signal (on/off) to drive the controllable switch N (on/off), the energy storage capacitor C, the controllable switch N and the fly-wheel diode D, LCU logic control unit jointly form a CMU unit, the number of cells in the solar silicon wafer group string voltage Vc is N = 10-100, under a normal state, the photovoltaic Vc current generated by the solar silicon wafer group string voltage is consistent with the main loop current Ic, and the controllable control N switch is communicated, the module follows the normal electricity generation output of the system MPPT, when the voltage Vc of the solar silicon wafer string Is blocked and the like to cause the reduction of the photo-generated current Is of the solar silicon wafer string Is smaller than the current Ic of the main loop, Vinl Is reduced when the voltage Vin at two ends of the parallel energy storage capacitor C Is reduced to a preset voltage value, the controllable switch N Is timely disconnected, the freewheeling diode D provides a freewheeling path for the current Ic of the main loop, after the controllable switch N Is disconnected, the voltage Vc of the solar silicon wafer string with the reduction of the photo-generated current Is caused by the blocking and the like continues to charge and store energy by taking the current IS as the energy storage capacitor C, when the charging voltage Vin of the energy storage capacitor C Is close to the normal voltage Vinh = N × Vc of the string, the control switch N Is connected again, the energy storage capacitor C Is connected with the photo-generated current Is of the voltage Vc of the solar silicon wafer string in parallel by the discharge of the Ics, and Is = Ic of the current Ic of the main loop; when the voltage Vin of the energy storage capacitor C Is reduced to the preset voltage value Vinl after discharging, the controllable switch n Is switched off timely, and the voltage Vc of the solar silicon wafer set charges the energy storage capacitor C again by using the current Is for storing energy.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101431246A (en) * | 2008-12-19 | 2009-05-13 | 北京理工大学 | Apparatus and method for improving output efficiency of low-power photovoltaic battery |
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| TW533614B (en) * | 2001-08-06 | 2003-05-21 | Jin-Shing Luo | Solar energy power source supplier using power capacitor |
| TWI357203B (en) * | 2007-08-08 | 2012-01-21 | Solar energy charging/discharging system | |
| CN104506132B (en) * | 2015-01-26 | 2017-05-31 | 深圳市永联科技股份有限公司 | A kind of control method of the hardware circuit of the low-loss photovoltaic battery panel optimization output power device of high efficiency |
| CN106533163A (en) * | 2016-01-22 | 2017-03-22 | 东莞市清能光伏科技有限公司 | Photovoltaic power converter |
| CN106452344B (en) * | 2016-10-27 | 2019-04-12 | 西安交通大学 | A kind of distribution maximal power tracing integrated control system and method |
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| CN101431246A (en) * | 2008-12-19 | 2009-05-13 | 北京理工大学 | Apparatus and method for improving output efficiency of low-power photovoltaic battery |
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