A portion of the disclosure of this patent document contains material which is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the patent and trademark office patent file or records, but otherwise reserves all copyright rights whatsoever.
The present invention relates to the field of preventing theft of solar panels.
The protocol of the local management unit (LMU) in a photovoltaic energy system is very important. In particular, the protocol must be able to recover from all kinds of errors. It must be self-adjusting, for example, in the case of errors and other problems, and it must maintain certain safety aspects at all times, such as maximum voltage and other desired parameters.
As communications between local controllers and the master controller in a photovoltaic energy system are important to maintain optimal MPPT (maximum power point tracker), it is important to ensure that these communications, as well as the components of the system, are secure.
Most theft-protection systems for solar panels require power. However, at night, the solar panels are dark, and therefore they generate no power. Hence, in many cases, theft protection systems may not work.
A solar panel system includes one or more solar panels interconnected to one or more local management units. A controller is interconnected to a power supply which is independent of the panels, with the power supply feeding power to the local management units. This enables the local management units to operate during periods of panel shutdown (e.g., during nighttime) and to query the respective panels. If one or more of the panels do not respond, then the local management unit raises an alarm.
These and other objects and advantages of the present invention will become clear to those skilled in the art in view of the description of the best presently known mode of carrying out the invention and the industrial applicability of the preferred embodiment as described herein.
The embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings in which like references indicate similar elements.
The following description and drawings are illustrative and are not to be construed as limiting. Numerous specific details are described to provide a thorough understanding. However, in certain instances, well known or conventional details are not described in order to avoid obscuring the description. References to one or an embodiment in the present disclosure are not necessarily references to the same embodiment; and, such references mean at least one.
The use of headings herein are merely provided for ease of reference, and shall not be interpreted in any way to limit this disclosure or the following claims.
Reference in this specification to “one embodiment” or “an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the disclosure. The appearances of the phrase “in one embodiment” 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. Moreover, various features are described which may be exhibited by some embodiments and not by others. Similarly, various requirements are described which may be requirements for some embodiments but not other embodiments.
What is needed is a system and method to fail-safe the operations of distributed local management units in a photovoltaic energy system.
An error treatment protocol may include one or more of various approaches. One typical approach would reset the LMU and start again at step 301. Another approach would shut down the LMU; while yet another would loop back to step 305 and try again. Appendix A shows an example of the protocol of communications between an exemplary distributed LMU and an exemplary MMU. It shows how a system can self detect elements, available channels etc, greatly reducing setup efforts. This is particularly important with the use of wireless communications, as channels may be blocked by outside sources of interference, and the system has to be able to self reconfigure.
In
What is needed is a system and method that secures communications and verifies that the panels are legitimate, registered panels for use in a photovoltaic energy system, while at the same time securing the components of said photovoltaic system, such as the local controllers on the panels and the master controller, from mischief and mistakes such as, for example, interference by an outside entity or using incorrect panels in the system.
What is needed is a system and method that can help theft prevention by feeding power from a source such as, for example, an auxiliary power supply, into the solar panel system. Such a power feed could be, for example, a reverse dc low-voltage feed that could wake up the local management units (LMUs) or other theft-protection units (TPUs), the latter of which may be separate local units, or integrated into the former at the panels for interaction with a central control unit. In some cases the units could be always on; in other cases the units could wake up from time to time. In yet other cases, to further save power, the auxiliary power would only be injected from time to time as needed, or even on a segment-by-segment basis. In some cases this auxiliary power may be a much lower voltage than the normal operational voltage is, just sufficient to operate the LMUs. In other cases, it may be the normal operational voltage, but the inverter is inhibited or shut-off by the MMU. Also, in some cases, an additional signal maybe injected on top of the voltage as a signal of a special state. Additional hardware may be needed to inject power only into one or more selected sections of a system. Should a panel be disconnected from the string in the process of a theft attempt, said panel obviously could not participate in an interaction, and therefore an alarm would be set off, for example, so a security guard could investigate in person, or look at video camera feeds, or use other inspection measures.
In some cases, in addition to a dc voltage wake-up signal, a low-frequency pilot signal may be overlaid, such as, for example, 400 Hz or similar, to indicate that this power feed from the auxiliary power unit or MMU is the theft alert wake-up and not the regular solar panel operation. Such an indication would eliminate the need to check for power from the solar panel and would immediately let the LMUs and TPUs know that this is a theft test operation.
In addition to the situation in which the LMU is disconnected from the solar array, there is a possible scenario where a solar panel is disconnected while leaving the LMU connected to the MMU. To account for this case, the LMU can be configured to monitor respective solar panels and strings for a change in resistance or capacitance. Such a change may indicate that a solar panel has been disconnected from the array and in this event, the LMU could actively notify the MMU.
A. Message Level
Command Summary
0x02—data request
0x03—data response
0x04—request NO DATA response
0x05—no data response
0x06—general parameter error response
0x08—send broadcast request
0x09—send broadcast response
0x0a—send version request
0x0b—send version response
0x0c—set channel
0x0d—set channel response
0x0e—read channel
0x0f—read channel response
0x10—Hard reset of Gateway
0x11—Response to hard reset
0x12—STORE settings
0x13—Response to STORE settings
0x14—Set unit ID
0x15—Set unit ID response
0x16—Get unit ID
0x17—Get unit ID response
B. Packet Level
It is clear that many modifications and variations of the system and method disclosed herein may be made by one skilled in the art without departing from the spirit of the novel art of this disclosure. These modifications and variations do not depart from its broader spirit and scope, and the examples cited here are to be regarded in an illustrative rather than a restrictive sense.
The present application claims priority to U.S. Provisional Application Ser. No. 61/343,154, filed Apr. 22, 2010, entitled “ENHANCED SYSTEM AND METHOD FOR THEFT PROTECTION IN A SOLAR POWER ARRAY DURING NONOPERATIVE PERIODS,” by Avrutsky et al., the entire contents of which application are incorporated by reference in their entirety as if fully set forth herein. The present application is a continuation-in-part of U.S. patent application Ser. No. 12/895,745, filed Sep. 30, 2010, entitled “SYSTEMS AND METHODS FOR A COMMUNICATION PROTOCOL BETWEEN A LOCAL CONTROLLER AND A MASTER CONTROLLER,” by Makhota et al., the entire contents of which application are incorporated by reference as if fully set forth herein. The present application is a continuation-in-part of U.S. patent application Ser. No. 12/985,883, filed Jan. 6, 2011, entitled “SYSTEMS AND METHODS FOR AN IDENTIFICATION PROTOCOL BETWEEN A LOCAL CONTROLLER AND A MASTER CONTROLLER,” by Eizips et al., the entire contents of which application are incorporated by reference as if fully set forth herein.
Number | Name | Date | Kind |
---|---|---|---|
4888702 | Gerken et al. | Dec 1989 | A |
5235266 | Schaffrin | Aug 1993 | A |
5268832 | Kandatsu | Dec 1993 | A |
5604430 | Decker et al. | Feb 1997 | A |
5923158 | Kurokami et al. | Jul 1999 | A |
6275016 | Ivanov | Aug 2001 | B1 |
6448489 | Kimura et al. | Sep 2002 | B2 |
6650031 | Goldack | Nov 2003 | B1 |
6844739 | Kasai et al. | Jan 2005 | B2 |
6894911 | Telefus et al. | May 2005 | B2 |
6984970 | Capel | Jan 2006 | B2 |
6996741 | Pittelkow et al. | Feb 2006 | B1 |
7061214 | Mayega et al. | Jun 2006 | B2 |
7161082 | Matsushita et al. | Jan 2007 | B2 |
7248946 | Bashaw et al. | Jul 2007 | B2 |
7256566 | Bhavaraju et al. | Aug 2007 | B2 |
7276886 | Kinder | Oct 2007 | B2 |
7518346 | Prexl | Apr 2009 | B2 |
7595616 | Prexl | Sep 2009 | B2 |
7602080 | Hadar et al. | Oct 2009 | B1 |
7605498 | Ledenev et al. | Oct 2009 | B2 |
7719140 | Ledenev et al. | May 2010 | B2 |
7991378 | Lindoff et al. | Aug 2011 | B2 |
8179147 | Dargatz et al. | May 2012 | B2 |
8271599 | Eizips et al. | Sep 2012 | B2 |
8304932 | Ledenev et al. | Nov 2012 | B2 |
8380126 | Ma et al. | Feb 2013 | B1 |
8473250 | Adest et al. | Jun 2013 | B2 |
8581441 | Rotzoll et al. | Nov 2013 | B2 |
8773236 | Makhota et al. | Jul 2014 | B2 |
20040056768 | Matsushita et al. | Mar 2004 | A1 |
20050057214 | Matan | Mar 2005 | A1 |
20050057215 | Matan | Mar 2005 | A1 |
20060001406 | Matan | Jan 2006 | A1 |
20060174939 | Matan | Aug 2006 | A1 |
20060185727 | Matan | Aug 2006 | A1 |
20070273351 | Matan | Nov 2007 | A1 |
20080097655 | Hadar et al. | Apr 2008 | A1 |
20080121272 | Besser et al. | May 2008 | A1 |
20080122449 | Besser et al. | May 2008 | A1 |
20080122518 | Besser et al. | May 2008 | A1 |
20080179949 | Besser et al. | Jul 2008 | A1 |
20080191560 | Besser et al. | Aug 2008 | A1 |
20080191675 | Besser et al. | Aug 2008 | A1 |
20080303503 | Wolfs | Dec 2008 | A1 |
20090012917 | Thompson et al. | Jan 2009 | A1 |
20090066357 | Fornage | Mar 2009 | A1 |
20090179662 | Moulton et al. | Jul 2009 | A1 |
20090242011 | Proisy et al. | Oct 2009 | A1 |
20090283130 | Gilmore et al. | Nov 2009 | A1 |
20090309727 | Rice | Dec 2009 | A1 |
20100115093 | Rice | May 2010 | A1 |
20100139734 | Hadar et al. | Jun 2010 | A1 |
20100191383 | Gaul | Jul 2010 | A1 |
20100207764 | Muhlberger et al. | Aug 2010 | A1 |
20100295680 | Dumps | Nov 2010 | A1 |
20100301991 | Sella et al. | Dec 2010 | A1 |
20100321148 | Gevorkian | Dec 2010 | A1 |
20110012430 | Cheng et al. | Jan 2011 | A1 |
20110105094 | Hassan et al. | May 2011 | A1 |
20110161722 | Makhota et al. | Jun 2011 | A1 |
20110172842 | Makhota et al. | Jul 2011 | A1 |
20110173276 | Eizips et al. | Jul 2011 | A1 |
20110210612 | Leutwein | Sep 2011 | A1 |
20110246338 | Eich | Oct 2011 | A1 |
20110260866 | Avrutsky et al. | Oct 2011 | A1 |
20120215367 | Eizips et al. | Aug 2012 | A1 |
20130332093 | Adest et al. | Dec 2013 | A1 |
Number | Date | Country |
---|---|---|
2005262278 | Jul 2005 | AU |
2704605 | May 2009 | CA |
4232356 | Mar 1994 | DE |
19961705 | Jul 2001 | DE |
1388774 | Feb 2004 | EP |
2061088 | May 2009 | EP |
2249147 | Mar 2006 | ES |
03012569 | Feb 2003 | WO |
WO 2007048421 | May 2007 | WO |
2009056957 | May 2009 | WO |
WO 2009056957 | May 2009 | WO |
Entry |
---|
Canadian Patent Application No. CA 2704605 English Title: Anti-Theft Monitoring Device and a Method for Monitoring an Electrical Appliance, Especially a Solar Module, Abstract, Patent Details, Images, All Claims included & available at URL http://brevets-patents.ic.gc.ca/opic-cipo/cpd/eng/patent/2704605, See Item N, p. 1, PTO-892 above. |
J. Keller and B. Kroposki, titled, “Understanding Fault Characteristics of Inverter-Based Distributed Energy Resources”, in a Technical Report NREL/TP-550-46698, published Jan. 2010, pp. 1 through 48. |
Canadian Patent Application No. CA 2704605, Title: Anti-Theft Monitoring Device and a Method for Monitoring an Electrical Appliance, Especially a Solar Module, Abstract, Patent Details, Images, All Claims included & available at URL http://brevets-patents.ic.gc.ca/opic-cipo/cpd/eng/patent/2704605, See Item O and K, p. 1, PTO-892 above. |
International Patent Application No. PCT/US2011/020591, International Search Report and Written Opinion, Aug. 8, 2011. |
International Patent Application No. PCT/US2011/033544, International Search Report and Written Opinion, Nov. 24, 2011. |
Alonso, R. et al., “A New Distributed Converter Interface for PV Panels,” 20th European Photovoltaic Solar Energy Conference, Barcelona, Spain, pp. 2288-2291, Jun. 6-10, 2005. |
Alonso, R. et al., “Experimental Results of Intelligent PV Module for Grid-Connected PV Systems,” 21st European Photovoltaic Solar Energy Conference, Dresden, Germany, pp. 2297-2300, Sep. 4-8, 2006. |
Basso, Tim, “IEEE Standard for Interrconnecting Distributed Resources With the Electric Power System,” IEEE PES Meeting, Jun. 9, 2004. |
Boostbuck.com, “The Four Boostbuck Topologies,” located at http://www.boostbuck.com/TheFourTopologies.html, 2003. |
Enslin, Johan H.R., et al., “Integrated Photovoltaic Maximum Power Point Tracking Converter,” IEEE Transactions on Industrial Electronices, vol. 44, No. 6, pp. 769-773, Dec. 1997. |
Gautam, Nalin K. et al., “An Efficient Algorithm to Simulate the Electrical Performance of Solar Photovoltaic Arrays,” Energy, vol. 27, No. 4, pp. 347-361, 2002. |
Linares, Leonor et al., “Improved Energy Capture in Series String Photovoltaics via Smart Distributed Power Electronics,” 24th Annual IEEE Applied Power Electronics Conference and Exposition, pp. 904-910, Feb. 15, 2009. |
Nordmann, T. et al., “Performance of PV Systems Under Real Conditions,” European Workshop on Life Cycle Analysis and Recycling of Solar Modules, The “Waste” Challenge, Brussels, Belgium, Mar. 18-19, 2004. |
Palma, L. et al., “A Modular Fuel Cell, Modular DC-DC Converter Concept for High Performance and Enhanced Reliability,” 38th IEEE Power Electronics Specialists Conference (PESC'07), pp. 2633-2638, Jun. 17, 2007. |
Quaschning, V. et al., “Cost Effectiveness of Shadow Tolerant Photovoltaic Systems,” Euronsun 96, pp. 819-824, Sep. 16, 1996. |
Roman, Eduardo, et al., “Intelligent PV Module for Grid-Connectred PV Systems,” IEEE Transactions on Industrial Electronics, vol. 53, No. 4, pp. 1066-1073, Aug. 2006. |
Uriarte, S. et al., “Energy Integrated Management System for PV Applications,” 20th European Photovoltaic Solar Energy Conference, Jun. 6, 2005. |
Walker, G. R. et al., “Cascaded DC-DC Converter Connection of Photovoltaic Modules,” 33rd IEEE Power Electronics Specialists Conference (PESC'02), vol. 1, pp. 24-29, 2002. |
Walker, Geoffrey R. et al., “Cascaded DC-DC Converter Connection of Photovoltaic Modules,” IEEE Transactions on Power Electronics, vol. 19, No. 4, pp. 1130-1139, Jul. 2004. |
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Child | 13092099 | US | |
Parent | 12985883 | Jan 2011 | US |
Child | 12895745 | US |