The present invention relates to an electric power producing plant that is distributed along the path of existing power lines, and which is connected to the electric grid at multiple locations along the power lines.
Renewable energy with low carbon dioxide profile is becoming increasingly important, as the world works to reduce the carbon dioxide emission and preserve the Earth. In many cases smaller renewable energy plants, like solar photovoltaic farms, wind turbines farms, solar thermal plants, etc. are selling their excess energy into the existing external electric power grids. The current mode of operation consists of concentrating the power sources from the entire farm and combining their outputs into one, which is then connected to the grid. There are obvious advantages in this approach main of which is the ease of maintenance. Nevertheless, there are a number of disadvantages, which this invention is addressing.
One of major requirements for an energy plant is the availability of a sufficiently large parcel of land to locate the plant. In busy and densely populated areas this requirement can be a big obstacle, since the land can be very expensive or unavailable.
A new method of supplying energy from power generators to an energy grid is provided. In accordance with the present invention, the electric power generators are distributed along the grid and each individual energy generator is directly connected to the grid at these locations. Such an arrangement can be referred to as a distributed energy plant. One of the advantages of a distributed plant is that it can be located in areas were a traditional plant could not otherwise be located.
In contrast to the present invention, when an energy farm is positioned outside the area of use, the transmission losses can be quite significant. Moreover, the energy farm is usually connected to the energy grid at a single connection point. Thus, the entire supply of energy is only as robust as this connection point. The present invention reduces the risk of complete failure by providing multiple points of connection to the energy grid. This arrangement also advantageously reduces transmission losses, since the energy generators are in close proximity to the electric power lines in the energy grid.
a and 2b show specific examples of an energy generator that includes a solar photovoltaic cell with and without a concentrator, respectively.
The proposed scheme is illustrated in
While this approach could potentially require a larger initial investment to implement, as compared to a traditional localized energy farm and therefore may not look attractive, the main contributors to the initial cost would be the voltage converters. However, future developments in solar cells and other power generators should lead to integrated converters of much lower cost, removing this potential limitation.
Furthermore, inverters and other electrical components that may be needed may be located in other more readily accessible parts of the overall electrical grid, which would dramatically reduce both the installation and maintenance costs of a distributed power plant. For example, a large number of solar panels each positioned on a different electrical pole could be electrically connected to a single inverter. The electrical connection could be provided by either dedicated electrical lines or existing electrical lines. In the former case, a large number of solar cells are first connected to a small or medium size DC electrical grid, which directs solar-derived electricity into a large AC electrical grid through a connection point containing a single inverter. In the latter case shown in
This concept of multiplexing different types of electrical energies into the same electrical power line could be used along with other AC-based renewable energy sources as long as the characteristic frequency of such electrical generators is different from that of the main power line frequency. In this case, electrical bandpass filters could be used to isolate different energy sources from each other and allow electrical connection to the same power line. Thus, a power line 501 with a multitude of different energy sources can be envisioned as shown in
A number of potential implementation of the above idea can be envisioned. The energy generator can be a solar cell, a wind turbine, a solar thermoelectric mini-turbine, etc. An example of an implementation with a solar cell and wind turbine are given below. Most attractive implementations of a distributed power plant are those involving maintenance free components such as solar cell panels or modules.
An individual energy generator of small enough size, such as a solar cell, can be positioned directly on the utility pole and connected to the grid.
In this example a wind turbine is positioned on the utility pole and connected to the grid.
Although various embodiments and examples are specifically illustrated and described herein, it will be appreciated that modifications and variations are covered by the above teachings.
This application is a continuation of co-pending U.S. patent application Ser. No. 13/351,075, filed Jan. 16, 2012, which is a continuation of U.S. patent application Ser. No. 11,860,450, filed Sep. 24, 2007, now U.S. Pat. No. 8,097,980, issued Jan. 17, 2012. The aforementioned related patent applications are herein incorporated by reference in their entireties.
Number | Name | Date | Kind |
---|---|---|---|
3300570 | Spiece et al. | Jan 1967 | A |
4200904 | Doan | Apr 1980 | A |
4224082 | Jacobson | Sep 1980 | A |
4281369 | Batte | Jul 1981 | A |
4291233 | Kirschbaum | Sep 1981 | A |
4357542 | Kirschbaum | Nov 1982 | A |
5040948 | Harburg | Aug 1991 | A |
6400039 | Wobben | Jun 2002 | B1 |
6455767 | Muller | Sep 2002 | B1 |
6559371 | Shingleton et al. | May 2003 | B2 |
6784357 | Wang | Aug 2004 | B1 |
6930237 | Mattiuzzo | Aug 2005 | B2 |
7071579 | Erdman et al. | Jul 2006 | B2 |
7075189 | Heronemus et al. | Jul 2006 | B2 |
7180270 | Rufer et al. | Feb 2007 | B2 |
7239044 | Atcitty et al. | Jul 2007 | B1 |
7253537 | Weng et al. | Aug 2007 | B2 |
7317405 | Green et al. | Jan 2008 | B2 |
7321173 | Mann | Jan 2008 | B2 |
7339287 | Jepsen et al. | Mar 2008 | B2 |
7479774 | Wai et al. | Jan 2009 | B2 |
7501713 | Fein et al. | Mar 2009 | B2 |
7518266 | Eckroad | Apr 2009 | B2 |
7731383 | Myer | Jun 2010 | B2 |
7793467 | Melton et al. | Sep 2010 | B1 |
7834485 | Park | Nov 2010 | B2 |
7976180 | Haun et al. | Jul 2011 | B1 |
8007124 | Kim | Aug 2011 | B2 |
8077437 | Mumtaz et al. | Dec 2011 | B2 |
8253273 | Fredette et al. | Aug 2012 | B2 |
8275489 | Devine | Sep 2012 | B1 |
20020103745 | Lof et al. | Aug 2002 | A1 |
20050078491 | Song et al. | Apr 2005 | A1 |
20050081908 | Stewart | Apr 2005 | A1 |
20050121214 | Gould | Jun 2005 | A1 |
20050230980 | Brunet | Oct 2005 | A1 |
20060062034 | Mazumder et al. | Mar 2006 | A1 |
20070013194 | Calley | Jan 2007 | A1 |
20070052244 | Hudson | Mar 2007 | A1 |
20070100506 | Teichmann | May 2007 | A1 |
20070117017 | Sugiyama et al. | May 2007 | A1 |
20080137327 | Hodulik | Jun 2008 | A1 |
20080266922 | Mumtaz et al. | Oct 2008 | A1 |
20100139735 | Anderson | Jun 2010 | A1 |
20110017256 | Stevens | Jan 2011 | A1 |
20110305010 | Leadford et al. | Dec 2011 | A1 |
20120280570 | Smythe et al. | Nov 2012 | A1 |
20120302228 | Gray | Nov 2012 | A1 |
20130000632 | Lundahl et al. | Jan 2013 | A1 |
Number | Date | Country |
---|---|---|
1 612 906 | Jan 2006 | EP |
WO 9606481 | Feb 1996 | WO |
WO 03036688 | May 2003 | WO |
WO 2006119649 | Nov 2006 | WO |
Entry |
---|
International Search Report and Written Opinion mailed Nov. 25, 2008 for PCT Application No. PCT/US2008/075123. |
Extended European Search Report dated May 2, 2013 for European Application No. 08834431.2-1804/2238522; PCT/US2008075123. |
“Electrical Engineering Between Energy and Information”, Werner Leonhard, Technical University Braunshweig, pp. 197-202. |
Number | Date | Country | |
---|---|---|---|
20130342021 A1 | Dec 2013 | US |
Number | Date | Country | |
---|---|---|---|
Parent | 13351075 | Jan 2012 | US |
Child | 14015372 | US | |
Parent | 11860450 | Sep 2007 | US |
Child | 13351075 | US |