en>Compsonheir: /* Practical assembly of the stiffness matrix */ fixed an error, D matrix is 2x3

2013-10-10T19:58:33Z

Practical assembly of the stiffness matrix: fixed an error, D matrix is 2x3

← Older revision		Revision as of 21:58, 10 October 2013
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	~~If an existing Word - Press code~~ is ~~found vulnerable, Word - Press will immediately issue an update for that. Also, you may want~~ to ~~opt for a more professioanl theme if you are planning on showing your site off~~ to ~~a high volume of potential customers each day. Should you go with simple HTML~~ or ~~use a platform like Wordpress~~. In the ~~recent years~~, ~~there has been a notable rise in~~ the ~~number~~ of ~~companies hiring Indian Word - Press developers~~. ~~You can easily customize~~ the ~~titles~~ of the ~~posts in Word - Press blog~~ in a ~~way that only title comes~~ in ~~the new post link and not the date~~ or ~~category of posts~~. ~~<br><br>~~		{{merge\|Maximum_power_point_tracking\|target=Maximum power transfer theorem\|discuss=talk:Maximum power transfer theorem\|date=September 2013}}
			A '''power optimizer''' is a [[DC to DC converter]] technology developed to maximize the energy harvest from solar [[photovoltaic]] or wind turbine systems. They do this by individually tuning the performance of the panel or wind turbine through [[maximum power point tracking]], and optionally tuning the output to match the performance of the [[string inverter]]. Power optimizers are especially useful when the performance of the power generating components in a distributed system will vary widely, differences in equipment, shading of light or wind, or being installed facing different directions or widely separated locations.

	~~Right starting from social media support~~ to ~~search engine optimization~~, ~~such plugins are easily available within~~ the ~~Word - Press open source platform~~. ~~If you wish~~ to ~~sell your services~~ or ~~products via internet using your website~~, ~~you have to put together~~ on the ~~website~~ the ~~facility~~ for ~~trouble-free payment transfer between customers~~ and ~~the company~~. ~~It allows Word - Press users~~ to ~~easily use HTML5~~ the ~~element enable native video playback within~~ the ~~browser~~. ~~If you liked~~ this ~~report~~ and ~~you would like to acquire far more details about~~ [http://~~www~~.nt-~~protect~~.~~host~~.~~sk/?wordpress_backup_plugin_586473 wordpress backup~~] ~~kindly pay~~ a ~~visit to our own site~~. ~~This~~ is ~~identical to doing~~ a ~~research as in depth above~~, ~~nevertheless you can see various statistical details like~~ the ~~number~~ of ~~downloads and when~~ the ~~template was not long ago updated~~. ~~W3C compliant HTML and~~ a ~~good open source powered by Word - Press CMS site is regarded~~ as the ~~prime minister~~. <br><br>~~The entrepreneurs can easily captivate their readers by using these versatile themes~~. ~~Note~~: ~~at a first glance WP Mobile Pro themes do not appear to be glamorous or fancy~~. ~~You~~'~~ve got invested~~ a ~~great cope~~ of ~~time developing and producing up~~ the ~~topic substance~~. ~~In crux~~ the ~~developer must have a detailed knowledge not only about~~ the ~~marketing tool but also~~ about ~~the ways~~ in ~~which it~~ can be applied ~~profitably~~. ~~After~~ that the ~~developer adds~~ the ~~unordered list for navigations~~. <br><br>~~The next thing I did after installing Wordpress was~~ to ~~find myself~~ a ~~free good-looking Wordpress-theme offering~~ the ~~functionality~~ I ~~was after~~. ~~php file in the Word - Press root folder and look~~ for ~~this line~~ (~~line 73 in our example~~):. ~~Normally~~, the ~~Word~~ - ~~Press developers make~~ a ~~thorough research on your website goals and then ingrain the most suitable graphical design elements~~ to ~~your website~~. So, ~~we have to add our social media sharing buttons in website~~. ~~The popularity of Word~~ - ~~Press has increased the demand for Word~~ - ~~Press themes and these themes sells like hot cake~~ on ~~the internet~~. <br>~~<br>Internet~~ is ~~not only~~ the ~~source for information~~, it is ~~also one~~ of ~~the source for passive income~~. ~~I'm~~ a ~~large fan~~ of ~~using Word - Press~~ to ~~create pretty much any sort~~ of ~~web page~~. This allows ~~updates~~ to ~~be sent anyone who wants them via an RSS reader~~ or ~~directly~~ to ~~their email~~. It is a ~~fact~~ that ~~Smartphone using online customers do not waste much~~ of ~~their time in struggling with drop down menus~~. ~~Likewise~~, ~~professional publishers with a multi author~~ and ~~editor setup often find that Word~~ - ~~Press lack basic user~~ and ~~role management capabilities.~~		Power optimizers for solar applications, can be similar to [[microinverter]]s, in that both systems attempt to isolate individual panels in order to improve overall system performance. A [[smart module]] is a power optimizer integrated into a solar module. A microinverter essentially combines a power optimizer with a small inverter in a single case that is used on every panel, while the power optimizer leaves the inverter in a separate box and uses only one inverter for the entire array. The claimed advantage to this "hybrid" approach is lower overall system costs, avoiding the distribution of electronics.

			==Description==
			===Maximum power point tracking (MPPT)===
			Most energy production or storage devices have a complex relationship between the power they produce, the load placed on them, and the efficiency of the delivery. A conventional battery, for instance, stores energy in chemical reactions in its electrolytes and plates. These reactions take time to occur, which limits the rate at which the power can be efficiently drawn from the cell.<ref>Venkat Srinivasan, [http://gigaom.com/cleantech/the-three-laws-of-batteries-and-a-bonus-zeroth-law/ "The Three Laws of Batteries"], GigaOm, 18 March 2011</ref> For this reason, large batteries used for power storage generally list two or more capacities, normally the "2 hour" and "20 hour" rates, with the 2 hour rate often being around 50% of the 20 hour rate.<ref> Isidor Buchmann, [http://batteryuniversity.com/partone-16.htm "Discharge methods"], Battery University</ref>

			[[Image:Solar-Cell-IV-curve-with-MPP.png\|thumb\|Typical cell I-V curves showing the relationship between current, voltage and total output for differing amounts of incoming light.]]

			Solar panels have similar issues due to the speed at which the cell can convert solar [[photon]]s into [[electron]]s, ambient temperature, and a host of other issues. In this case there is a complex non-linear relationship between voltage, current and the total amount of power being produced, the "I-V curve".<ref>N. Shenck, [http://alumni.media.mit.edu/~nate/AES/PV_Theory_II.pdf "PV Power Systems: PV Theory II"], MIT</ref> In order to optimize collection, modern solar arrays use a technique known as "[[maximum power point tracking]]" (MPPT) to monitor the total output of the array and continually adjust the presented load to keep the system operation at its peak efficiency point.<ref>[http://www.innovativesolar.com/images/File/BSE_What_is_MPPT.pdf "What is Maximum Power Point Tracking and How Does it Work?"], BlueSky Energy</ref>

			Traditionally, solar panels produce voltages around 30 V.<ref>[http://www.backwoodssolar.com/catalog/Spec_Sheets/SolarWorld_245_Spec.pdf SolarWorld's SW 245] is a typical modern panel, using 6" cells in a 6 by 10 arrangement and a <math>V_{oc}</math> of 30.8 V</ref> This is too low to be effectively converted into [[alternating current\|AC]] to feed to the [[power grid]]. To address this, panels are strung together in series to increase the voltage to something more appropriate for the inverter being used, typically about 600 V.<ref>[http://www.sma-america.com/en_US/products/grid-tied-inverters/sunny-boy/sunny-boy-3000-us-3800-us-4000-us.html SMA's SunnyBoy] series comes in US and European versions, and generally suggest 500 to 600 VDC inputs.</ref>

			The drawback to this approach is that MPPT system can only be applied to the array as a whole. Because the I-V curve is non-linear, a panel that is even slightly shadowed can have dramatically lower output, and greatly increase its internal resistance. As the panels are wired in series, this would cause the output of the entire string to be reduced due to the increased total resistance. This change in performance causes the MPPT system to change the operation point, moving the rest of the panels away from their best performance.<ref>[http://eiqenergy.com/parallel_solar/increase_power.php "Increase Power Production"], eIQ Energy</ref>

			Because of their sequential wiring, power mismatch between PV modules within a string can lead to a drastic and disproportionate loss of power from the entire solar array, in some cases leading to complete system failure.<ref>Chaintreuil, N. et al. “Effects of Shadow on Grid Connected PV System” INES R.D.I. Laboratory for Solar Systems (L2S), Le Bourget-du-Lac, France. Bruendlinger, R. et al. “Maximum Power Point Tracking Performance Under {{sic\|hide=y\|Partially\|-}}Shaded PV Array Conditions” Paper submitted to the 21st European Photovoltaic Solar Energy Conference, 4-8 September 2008, Dresden, Germany.</ref> Shading of as little as 9% of the entire surface array of a PV system can, in some circumstances, lead to a system-wide power loss of as much as 54%.<ref>Muenster, R. [“Shade Happens”] Renewable Energy World.com http://www.renewableenergyworld.com/rea/news/article/2009/02/shade-happens-54551 2009-02-02. Retrieved on 2009-03-09.</ref> Although this problem is most notable with "large" events like a passing shadow, even the tiniest differences in panel performance, due to dirt, differential aging or tiny differences during manufacturing, can make the array as a whole operate away from its best MPPT point. "Panel matching" is an important part of solar array design.

			=== Isolating panels ===
			These problems have led to a number of different potential solutions that isolate panels individually or into much smaller groups (2 to 3 panels) in an effort to provide MPPT that avoids the problems of large strings.

			One solution, the [[microinverter]], places the entire power conversion system directly on the back of each panel. This allows the system to track the MPPT for each panel, and directly output AC power that matches the grid. The panels are then wired together in parallel, so even the failure of one of the panels or microinverters will not lead to a loss of power from the string. However, this approach has the disadvantage of distributing the power conversion circuitry, which, in theory, is the expensive part of the system. Microinverters, at least as late as early 2011, had significantly higher [[price per watt]].

			This leads, naturally, to the power optimizer concept, where only the MPPT system is distributed to the panels. In this case the conversion from DC to AC takes place in a single inverter, one that lacks the MPPT hardware or has it disabled. According to its supporters, this "hybrid" approach produces the lowest-cost solution overall, while still maintaining the advantages of the microinverter approach.

			== Major players ==
			According to an IMS Research report from September 2012, [[BMSolar]], [[Tigo Energy]], [[SolarEdge]] Technologies Inc. and [[Enphase Energy]] accounted for more than 90 percent of micro inverter and power optimizer shipments in 2011.<ref>[http://www.pvmarketresearch.com/press-release/Microinverters_Power_Optimizers_Outpace_PV_Inverters_in_2011_70_percent_Growth_Predicted_in_2012/4 ]</ref>

			== Notes and references ==
			{{reflist}}

			{{DEFAULTSORT:Power Optimizer}}
			[[Category:Electrical power control]]
			[[Category:Photovoltaics]]

en>Justincheng12345-bot: r2.7.3) (Robot: Adding it:Matrice di rigidezza, zh:刚度矩阵

2012-08-31T09:40:09Z

r2.7.3) (Robot: Adding it:Matrice di rigidezza, zh:刚度矩阵

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If an existing Word - Press code is found vulnerable, Word - Press will immediately issue an update for that. Also, you may want to opt for a more professioanl theme if you are planning on showing your site off to a high volume of potential customers each day. Should you go with simple HTML or use a platform like Wordpress. In the recent years, there has been a notable rise in the number of companies hiring Indian Word - Press developers. You can easily customize the titles of the posts in Word - Press blog in a way that only title comes in the new post link and not the date or category of posts. 

Right starting from social media support to search engine optimization, such plugins are easily available within the Word - Press open source platform. If you wish to sell your services or products via internet using your website, you have to put together on the website the facility for trouble-free payment transfer between customers and the company. It allows Word - Press users to easily use HTML5 the element enable native video playback within the browser. If you liked this report and you would like to acquire far more details about [http://www.nt-protect.host.sk/?wordpress_backup_plugin_586473 wordpress backup] kindly pay a visit to our own site. This is identical to doing a research as in depth above, nevertheless you can see various statistical details like the number of downloads and when the template was not long ago updated. W3C compliant HTML and a good open source powered by Word - Press CMS site is regarded as the prime minister. The entrepreneurs can easily captivate their readers by using these versatile themes. Note: at a first glance WP Mobile Pro themes do not appear to be glamorous or fancy. You've got invested a great cope of time developing and producing up the topic substance. In crux the developer must have a detailed knowledge not only about the marketing tool but also about the ways in which it can be applied profitably. After that the developer adds the unordered list for navigations. The next thing I did after installing Wordpress was to find myself a free good-looking Wordpress-theme offering the functionality I was after. php file in the Word - Press root folder and look for this line (line 73 in our example):. Normally, the Word - Press developers make a thorough research on your website goals and then ingrain the most suitable graphical design elements to your website. So, we have to add our social media sharing buttons in website. The popularity of Word - Press has increased the demand for Word - Press themes and these themes sells like hot cake on the internet. Internet is not only the source for information, it is also one of the source for passive income. I'm a large fan of using Word - Press to create pretty much any sort of web page. This allows updates to be sent anyone who wants them via an RSS reader or directly to their email. It is a fact that Smartphone using online customers do not waste much of their time in struggling with drop down menus. Likewise, professional publishers with a multi author and editor setup often find that Word - Press lack basic user and role management capabilities.

Stiffness matrix - Revision history

en>Compsonheir: /* Practical assembly of the stiffness matrix */ fixed an error, D matrix is 2x3

en>Justincheng12345-bot: r2.7.3) (Robot: Adding it:Matrice di rigidezza, zh:刚度矩阵