DE19838230A1 - Operating point optimization for photo-voltaic or thermo-voltaic energy converter with variable internal resistance, changing load current periodically around operating point at high frequency - Google Patents
Operating point optimization for photo-voltaic or thermo-voltaic energy converter with variable internal resistance, changing load current periodically around operating point at high frequencyInfo
- Publication number
- DE19838230A1 DE19838230A1 DE19838230A DE19838230A DE19838230A1 DE 19838230 A1 DE19838230 A1 DE 19838230A1 DE 19838230 A DE19838230 A DE 19838230A DE 19838230 A DE19838230 A DE 19838230A DE 19838230 A1 DE19838230 A1 DE 19838230A1
- Authority
- DE
- Germany
- Prior art keywords
- energy converter
- current
- operating point
- voltaic
- internal resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000005457 optimization Methods 0.000 title 1
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims description 4
- 230000000737 periodic effect Effects 0.000 claims description 3
- 230000004913 activation Effects 0.000 claims 2
- 230000006978 adaptation Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/66—Regulating electric power
- G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
-
- 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
- H02S99/00—Subject matter not provided for in other groups of this subclass
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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
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Realisierung des Betriebes fotovoltaischer (Solarzellen) oder thermovoltaischer (Seebeck, Peltierelemente) Energiewandler mit stark variablem Innenwiderstand im Punkt maximaler Leistung (MPP).The invention relates to a method for implementing photovoltaic operation (Solar cells) or thermovoltaic (Seebeck, Peltier elements) energy converter with strong variable internal resistance in the point of maximum power (MPP).
Es ist bekannt, die Auffindung bzw. die Ermittlung des MPP bei Solarzellen, Peltierelementen u. a. durch verschiedene Verfahren zu erreichen.It is known to find or determine the MPP for solar cells, Peltier elements u. a. to achieve through different processes.
Es ist ebenfalls bekannt, daß der MPP dann exakt eingestellt ist, wenn der Außenwiderstand der Belastung des Energiewandlers dem Innenwiderstand des Energiewandlers entspricht (sog. Anpassungsfall). Sofern der Innenwiderstand jedoch selbst belastungsabhängig ist, kann der MPP nur durch dynamische Anpassung gewonnen werden. Das ist der Fall, wenn der Außenwiderstand der Belastung des Energiewandlers demjenigen Innenwiderstand des Energiewandlers entspricht, der der Neigung der Belastungskennlinie der Spannung in Abhängigkeit vom Strom im MPP entspricht (differenzieller Innenwiderstand).It is also known that the MPP is set exactly when the external resistance the load on the energy converter corresponds to the internal resistance of the energy converter (so-called adjustment case). If the internal resistance itself depends on the load, the MPP can only be obtained by dynamic adaptation. That is the case if the external resistance of the load of the energy converter that internal resistance of the Energy converter corresponds to the inclination of the load characteristic of the voltage in Corresponds to the current in the MPP (differential internal resistance).
Da der differenzielle Innenwiderstand bei verschiedenen Belastungsverhältnissen des Energiewandlers stark veränderlich ist und andererseits im stationären Betrieb meßtechnisch nicht zugänglich ist, wird mit bekannten Verfahren näherungsweise versucht, den MPP empirisch, teilweise mikrorechnergestützt, einzustellen.Since the differential internal resistance at different load conditions of the Energy converter is highly variable and, on the other hand, measurement technology in stationary operation is not accessible, the MPP is attempted using known methods empirically, partly supported by microcomputers.
Der Nachteil aller dieser Verfahren besteht darin, daß eine maximale Energieübertragung und -ausbeute, die exakt nur im MPP gegeben wäre, nur näherungsweise möglich ist. The disadvantage of all of these methods is that maximum energy transfer and yield, which would only exist in the MPP exactly, is only approximately possible.
Das Problem der Erfindung ist es, den Fall der dynamischen Anpassung des Außenwiderstandes an den differenziellen Innenwiderstand im laufenden Betrieb des belasteten Energiewandlers zu ermitteln und durch elektronische verzögerungsfreie Einstellung des Belastungsstromes ständig aufrecht zu erhalten.The problem of the invention is the case of dynamic adaptation of the External resistance to the differential internal resistance during operation of the to determine loaded energy converter and electronic delay-free Maintaining the load current constantly.
Ausgehend von der Tatsache, daß die Ausgangsspannung einer (reaktanzlosen) Spannungsquelle bei Belastung um den Betrag des Spannungsabfalls über dem Innenwiderstand abfällt, kann man den differenziellen Innenwiderstand in einem bestimmten Arbeitspunkt der Belastungskennlinie aus einer genügend kleinen Belastungsänderung und der daraus folgenden Ausgangsspannungsänderung berechnen.Based on the fact that the output voltage of a (non-reactive) Voltage source when loaded by the amount of voltage drop above the Internal resistance drops, you can see the differential internal resistance in a particular Working point of the load characteristic from a sufficiently small change in load and calculate the resulting output voltage change.
Erfindungsgemäß wird das Problem der Realisierung des Betriebes fotovoltaischer oder thermovoltaischer Energiewandler mit stark variablem Innenwiderstand im Punkt maximaler Leistung (MPP) dadurch gelöst, daß der Belastungsstrom mit hoher Frequenz periodisch um einen Arbeitspunkt (MPP) geändert wird und daß die Stromänderung, bezogen auf den stationären Wert (arithmetischer Mittelwert) des Stromes, gleich der durch die Stromänderung hervorgerufenen Spannungsänderung, bezogen auf den stationären Wert (arithmetischer Mittelwert) der Spannung, ist.According to the invention, the problem of implementing the operation is photovoltaic or thermovoltaic energy converter with highly variable internal resistance in the point of maximum Power (MPP) solved in that the load current periodically with high frequency is changed by an operating point (MPP) and that the current change, based on the stationary value (arithmetic mean) of the current, equal to that through the Current change caused voltage change, based on the stationary value (arithmetic mean) of the voltage.
Der Vorteil des Verfahrens besteht darin, daß bei Beschaltung des Energiewandlers mit einem Pufferkondensator und periodischer Aufschaltung auf einen Konstantstromkreis die relative Einschaltdauer der Aufschaltung dem Mittelwert der Spannung am Pufferkondensator, die der Ausgangsspannung des Energiewandlers entspricht, proportional eingestellt werden kann, wodurch der meßtechnische Aufwand zur Feststellung des MPP sehr gering gehalten werden kann.The advantage of the method is that when switching the energy converter with a buffer capacitor and periodic connection to a constant current circuit relative duty cycle of the connection to the mean value of the voltage at Buffer capacitor, which corresponds to the output voltage of the energy converter, proportional can be set, whereby the metrological effort to determine the MPP can be kept very low.
Ein weiterer Vorteil des Verfahrens besteht darin, daß bei einer In-Reihe-Schaltung des Energiewandlers mit einer Speicherinduktivität und periodischer Aufschaltung auf einen Konstantspannungskreis die relative Einschaltdauer der Aufschaltung dem Mittelwert des Stromes des Energiewandlers, der dem Strom durch die Speicherinduktivität entspricht, proportional eingestellt werden kann, wenn jeweils in der Zeit der Nichtaufschaltung die Speicherinduktivität energetisch vom Energiewandler aufgeladen wird, wodurch ebenfalls der meßtechnische Aufwand zur Feststellung des MPP sehr gering gehalten werden kann.Another advantage of the method is that in an in-series connection of the Energy converter with a storage inductance and periodic connection to one Constant voltage circuit the relative duty cycle of the intrusion the average of the Current of the energy converter, which corresponds to the current through the storage inductance, can be set proportionally if the Storage inductance is energetically charged by the energy converter, which also the metrological effort to determine the MPP can be kept very low.
Das Ausführungsbeispiel ist o. a. Darstellung entsprechend.The embodiment is above. Representation accordingly.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19838230A DE19838230A1 (en) | 1998-08-22 | 1998-08-22 | Operating point optimization for photo-voltaic or thermo-voltaic energy converter with variable internal resistance, changing load current periodically around operating point at high frequency |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19838230A DE19838230A1 (en) | 1998-08-22 | 1998-08-22 | Operating point optimization for photo-voltaic or thermo-voltaic energy converter with variable internal resistance, changing load current periodically around operating point at high frequency |
Publications (1)
Publication Number | Publication Date |
---|---|
DE19838230A1 true DE19838230A1 (en) | 2000-02-24 |
Family
ID=7878412
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19838230A Withdrawn DE19838230A1 (en) | 1998-08-22 | 1998-08-22 | Operating point optimization for photo-voltaic or thermo-voltaic energy converter with variable internal resistance, changing load current periodically around operating point at high frequency |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE19838230A1 (en) |
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-
1998
- 1998-08-22 DE DE19838230A patent/DE19838230A1/en not_active Withdrawn
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