EFY Times  
Sunday, November 23, 2014

 
GO
 
 

Power From 'Solar Grid'
 
Home >> Electronics >> Trends
 
Power From 'Solar Grid'  
 
There is an urgent need to modify policies under Jawaharlal Nehru National Solar Mission to speedily solve power problem in small towns and rural areas while the productive life of people ends with sunset. Here are the reasons and suggestions...   
Rate this news:  (4 Votes)
Wednesday, June 23, 2010 The most attractive and fascinating features of solar energy are its omnipresence and that it is available for free. The current photo voltaic solar cell may work only with just about 17 per cent to 18 per cent efficiency but what matters is its ability to transform solar energy into usable electrical power from a ‘free non-polluting’ energy source.

solar grid




Currently PV Solar is indeed the best option since no better technology breakthrough is in sight usable on a mass scale for the next few years. The credit therefore goes to the current government for taking a bold initiative and setting an ambitious target of 2500 megawatts of solar electric Power by 2012 and 20000 megawatts by 2020. The primary aim of Jawaharlal Nehru National Solar Mission (JNNSM) is to speedily augment inadequate electrical power hurting our inclusive development.

The Sun delivers more energy to the earth in one hour than what the world currently uses in a year! Therefore, it is our innovation in structuring policies that will enable us to realise our dream of extending productive life of our rural folks that today sadly ends with sunset.

Power Shortage Blues:
The people worst affected by power shortage and its quality from the copper grid are people in smaller towns and those in rural regions like farmers, artisans and their children. Working people suffer from productivity loss since rural economic activity currently stops at sunset and thereby each rural household loses close to 15 man-hours each day. Children also suffer since they can’t study at night or learn by watching television. Women suffer due to their inability to get informed from a wide variety of info-entertainment available non-stop via television.

Solar power can correct this since, unlike a copper grid, a solar Grid is available even in deep hinterlands. Only right policies from the government will allow us to use the solar grid to achieve inclusive development rather than waiting for the copper grid that indeed is a long term project with its associated operational delays.

Unfortunately however, our objective to improve power reliability and quality in small towns will not be realised unless the current policy undergoes important changes in order to quickly exploit and benefit from omnipresent “Solar Grid” to augment weakest links in the “Copper Grid”. For realising immediate rural productivity gains the current policy needs a modification.

With this change we can quickly meet the mission objective to make available stable, reliable and uninterrupted power to a vast population that lives outside metros and big cities. Let us examine why in depth.

Policy Lacunae:
The current policy allows only large solar energy plants of over one megawatt capacity to feed power into a 33kV grid. This portion of the grid basically is a ‘low impedance node’ and therefore has more stable power than the power available in small towns and fringe rural areas served from 3.3KV and a lower voltage grid primarily since these have high line impedance.

The feeder capacity is mostly inadequate as one goes down to 440V feeders. Most huge losses of power in the grid are at these fag end delivery points. An impedance analysis of the power grid done by the IEEE reveals that injecting alternative power at high impedance nodes improves the resultant power quality than feeding solar power at low impedance nodes.

That’s why in nearly every country like Germany, Spain, US and China, grid feed is allowed even in 230V line from even 5kW solar power generators. The biggest hardship and problem of all consumers in these areas is the blackout as well as poor quality fluctuating power.

Big industrial customers drawing power from 33kV or higher grid point generally receive good quality power. Those receiving power from low voltage feeders today suffer the most. It is true that the solar energy delivered into the 33kV grid will provide additional power from solar plants but this addition of 1 or 2 per cent power into these low impedance grid nodes will not unfortunately improve the quality of power that people in non-metro areas chronically suffer from.

Unlike India, every other country in the world allows solar power to be fed into the grid even at 230V. We need to understand why. The first important reason for this is to ensure adequate return on investment in every plant above 5 to 10kW capacity. This is possible only when the plant is fully loaded at all times due to the harvesting capacity of the plant throughout the time the sun is available.

This is never possible in off-grid plants since self-use power needs are widely variable and rated capacity is kept high to primarily meet peak demand. Thus all such plants have a large portion of their peak capacity available to feed into the grid and thereby harvest full energy.

Only when all such excess power is injected in a grid than one can harvest more solar power from investments made by the country under the scheme.

I am sure huge private investments will be made only when an identical subsidised rate per unit is paid to smaller grid fed solar plants for excess power that such plants will have.

This is how it happens in advanced nations like US, Germany, Spain, and China etc. The Energy needed in small non-industrial towns is at night. So, say, a 50kW plant with grid fed capability can deliver its power into the local high impedance grid during the day and draw that power at night. This will then sharply reduce the need for storing all power in batteries.

Grid Points
The second relates to the power delivery point of a grid. Studies in Spain reveal that feeding even 100kW of solar power in a low voltage grid immediately improves the power delivered to local people. So for bringing about quick improvement in availability of quality power in energy starved areas, our best option is to follow the Europeans and Americans and feed solar power into a local low voltage grid. The technology of measuring such energy feed is universally well established and used everywhere else in the world enabling the power utility to pay those who feed solar power into the grid.

There are many more reasons to promote distributed solar power generations than buying solar power only from big plants of one megawatt and above.

The first and the foremost reason is the fact that there is practically no financial advantage in having just large plants. The investment in a solar power plant is the same per watt of solar power. A 10kW plant will cost just 10 per cent of the cost of 100kW plant or the cost of 1 megawatt plant will be 10 times the cost of a 100kW plant. This is because the basic PV panel is the most important part of the plant cost and its power capacity is about 250Wp to 300Wp.

One just has to add even more panels to build a larger plant. Since the economy of scale doesn’t give any advantage, distributed generation is considered to be a better concept by experts than generating in bulk. This in turn means that such smaller but more effective solar energy plants could be created by medium size enterprises for local areas creating local jobs.

The second reason relates to the location of the feed into the copper grid. Feeding power at high impedance nodes will cause immediate power quality improvement. Consider say ten 10 to 50kW solar plants in areas near a town feed their power into the local lower voltage grid.

This will immediately improve the stability and reliability of the power available to the local people served from that feeder. In such a case, many local investors will come forward to invest in several smaller power plants within a town or a village. Investment in all these plants will be also profitable if the government buys power from these plants at the same rate that they currently pay to big plants feeding power into the 33kV grid.

Benefits Of Change
Feeding excess surplus power into the grid from ‘self use’ solar generators will also improve the power quality in the neigbourhood. If an industry in a small town sets up say a 50 or 100kW plant for its own captive use, it always has some excess power to feed to the grid. If this excess solar power is fed into the grid, it will not only help the country harvest more power but also load such plants to their full capacity so long as the sun is shining. Once this happens a large number of local entrepreneurs will set up such small plants. Experiences of solar power installations in the world also show that smaller solar power plants are easier to maintain than bigger plants. This also helps in facilitating local employment.

The third reason relates to a large open space that solar power plants need. One major problem with solar power plant is an unusually large ground space that it needs per kilowatt of power. As much as one square meter of area is needed for generating 100W of peak power! Location has to be such that there are now trees and structures casting shadows on a solar array. The place also needs to be secure and free from distractions like birds and monkeys. It is easier to find such place on terraces and barren non-arable lands in towns and fringe rural areas each accommodating 10 to 100kW plants. SMEs can therefore get into power generation business. The ministry of SME should seriously use this opportunity to ensure that SMEs benefit from this as much as big corporate enterprises.

Is it Unfair Policy for Small Enterprises?
Finally the government should not forget that one can challenge the current policy of buying power only from big solar plants in which only large corporations can invest money.

Suppose in a remote village local people invest and develop power with a 20kW plant to provide power to 50 to 100 hamlets, how can they be denied subsidies at the same rate that a big corporation gets for producing over one megawatt power.

No court will allow the government to discriminate in such a high-handed manner. In fact, such a village that invests in their own power plant needs to be encouraged since the state has been unable to invest and feed power to that village. Before the matter reaches that legal tangle, it is better that the government looks at its subsidy policy and ensures that there is justice for all.


-- P. S. Deodhar, ex-chairman, Electronics Commission, Govt of India and advisor to Rajiv Gandhi



Print Email Post Comment 
(Total Views: 4034)
 
Share

 
 
Electronics News
   
IR’s µHVIC Family Of Easy-To-Implement Building Blocks Simplifies Design
Giraffic Accelerates MPEG-DASH, Bringing The Industry Closer To True HD And UHD 4K TV Everywhere
WiTricity Announces Industry’s First Development Kit For Building Rezence-Certified Wireless Charging Systems
Extendable Platform Kits For MIPS Released By Imperas
IAR Systems Updates High-Performance Development Tools For The 8-Bit STM8 Core
 
 
 
     
     
     
     
     
     
Most popular
 

Daily

The Advantages Of Managing An Organization With Cloud Business Process Management (BPM)
Top 5 Hot Tech Deals This Week For You! Grab The Offers Now
MotionElements Sponsors Japan Post Production Conference In Conjunction With Inter BEE 2014
Tyto Announces Latest Version Of Sahi Pro Software
ABOVE Develops Deepak Chopra ‘Non-Local’ Meditation App DTS
Elitecore Wins Deloitte Technology Fast 50 Award
Square Replaces The Cash Register With Free Software To Empower The World's Entrepreneurs
Samsung Galaxy Alpha's Silver Variant To Be Available In India Soon
SanDisk Co-Founder And Retired CEO Receives United States’ Highest Honor For Scientific Achievement And Innovation At White House Ceremony
SkyVision Provides Cable & Wireless Seychelles With State-Of-The-Art IP Trunking And Managed Private Network Solution
 
   

Weekly

8 Killer Tools To Make Your App Development Experience Best Ever!
Know 7 Best Ways To Land A Job Opportunity At A Coding Contest
10 Best JavaScript Libraries For Building Charts And Graphs
15 Amazing Open Source Alternatives For Expensive Software
A Guide For Beginners, Planning To Start First Electronics Project
5 Reasons Why Fedora 21 Is So Keenly Awaited!
Here Comes A New Software To Detect And Auto-Repair Any Malware Damage
Microsoft Announces Shut-Down Of Windows Server 2003 By July 2015
Oracle Advances Data Integration Portfolio With Major Enhancements To Oracle GoldenGate 12c
Microsoft Leapfrogs Exxon To Become World’s Second Most Valuable Company
8 Must-Know Email Security Tips
Now An App Is Here To Tell You Why A Call Has Been Made!
Dell Introduces Voice-Enabled Venue 7 and Venue 8 Tablets In India
7 Tips To Make Your Online Search Experience Better
10 Cool Raspberry Pi Projects You Can Involve With!
Swipe 'Ultimate' Tablet-Cum-Laptop Hybrid With Windows 8.1 Unveiled!
 
   

Overall

Features
8 Most Useful Ajax And PHP Based Webmail Clients
These clients offer excellent user interface and sophisticated privacy protection and it allows users view HTML formatted email messages easily....
7 Best Free Archive Managers For Linux
Here we have compiled a list of seven best archive managers which can be used on daily basis....
8 Cyber-Crime Predictions For The Year To Come – 2015
So let's take a look at what are the most critical trends for 2015 when it comes to cyber-security....
12 Major Applications To Be Shipped With Linux Mint 17.1 “Rebecca” Cinnamon
Let's have a look at 12 major applications integrated in the Cinnamon version of Mint 17.1 Rebecca....
8 Killer Music Streaming Clients For Linux Users
If you are both a lover of Linux and music, you must be aware of the best music streaming services on the Linux platform....
10 Cool Raspberry Pi Projects You Can Involve With!
Here we will list down what are the 10 best Raspberry Pi projects which you can involve with....
15 Amazing Open Source Alternatives For Expensive Software
We have a list of fifteen open source applications, for enterprises, small businesses as well as average users....
7 Most Useful Debian Goodies For Debian/Ubuntu Administrators And Users
There are some commands which will let you know which packages are occupying most disk space on your system or to get your hands upon the most recent ...
A Guide For Beginners, Planning To Start First Electronics Project
Take a look at what are most required to begin your first electronics project....
Learn The Best Ways To Scan And Delete Duplicate Files On Your Linux System
Duplicate files consume the maximum portion of the disk space and if a similar file is located in two different locations, then a symbolic link or a h...
5 Reasons Why Fedora 21 Is So Keenly Awaited!
So why are we waiting so eagerly for Fedora 21? Let's take a look at five reasons behind the excitement factor....
8 Must-Know Email Security Tips
We have eight tips for you to keep your email secure, and to follow these tips, you don't need to be tech-savvy. ...
Learn The Steps To Launch Minecraft On Your Linux System
You first need to get your Linux system ready to install Minecraft and the process remains almost same for all the Linux distributions....
10 Best JavaScript Libraries For Building Charts And Graphs
Most of these libraries are free and open source, but if you require some additional features, then there are paid versions too....
8 Killer Tools To Make Your App Development Experience Best Ever!
We have listed here eight most cutting-edge and coolest tools for app developers which will definitely improve your experience of mobile app creations...
 
  View All
Dialogue
 
10 Questions That Google Never Asks While Hiring!
Here is a list of 10 questions that Google just banned from their interviews....
For Enjay, Open Source Technology Is A Way Of Life
An entirely open source-based company, Enjay IT Solutions, has built itself a reputation in the OSS domain....
Switching To Tizen Doesn’t Mean We Are Abandoning Android: Samsung
The company has worked to build Tizen up from scratch and has now introduced it to developers and the general public with its latest range of wearable...
Venturing Into The Cloud? Develop A Customised Cloud Strategy First!
Diksha P Gupta speaks to Rushikesh Jadhav, cloud evangelist, ESDS Software Solution Pvt Ltd, on how the cloud has changed the way compan...
HTC Is Strong And There Are No Plans Of Sale Now Or In Future, Says HTC's Senior Director-Marketing
Atithya Amaresh from EFYTimes had an exclusive chat with Sirpa H. Ikola, senior director, Marketing, South Asia, HTC about its devices and its plans w...
   
  View All
Videos
 
First Look: LG Optimus G
The phone sports a high-end display and comes powered by a powerful processor. ...
Create QR-Codes For Free
TEC-IT releases the freeware QR-Code Studio to provide a quick and convenient way of QR code creation for every application scenario....
DoT Secretary Shares Plans For Growth Of Telecom Sector
M.F. Farooqui has recently taken charge as secretary, Department of Telecom....
Hands-On: Sony Xperia Z
Xperia Z is Sony's first entrant model in the big-screen smartphone category. ...
Hands On: Videocon A30 Smartphone
Videocon, the consumer electronics company which is known for its refrigerators, washing machine and air-conditioner has unveiled its Android-based sm...
   
View All
   
 
IFA 2014
 
IFA 2014: LG Launches 34-Inches Curved Monitor
The company is yet to confirm price and availability of the device....
IFA 2014: Intel Launches First Core M Range Of Processors
This range of processors is tailor-made for 2-in-1 devices which include a tablet and a laptop....
MWC 2014: Tablet Lets People Feel Textures On Its Screen
Now feel what you see on your tablet, by way of ultrasonic waves....
MWC 2014: 4K Android Tablet Games To Kill Consoles, iPad
Tablet makers like Samsung want to beat the iPad by making 4K tabs. ...
MWC 2014: This Vodafone Backpack Helps Get Network In Disaster Situations
Two engineers of Vodafone New Zealand displayed the "mini" mobile network by Vodafone substructure in a backpack. ...
MWC 2014: Wilocity Chipset To Bring 'Lightening' Speed To Mobile Phones
Wilocity has developed a WiGig chipset for mobile phones that will bring lightning-fast wireless capability ...
MWC 2014: Samsung Introduces Octacore, Hexacore Chipsets
The Korean giant, Samsung unveiled two new octacore and hexacore chipsets at MWC 2014, in Barcelona. The company previously used Exynos 5 Octa 5410 ch...
   
View All
   
 
Events
 
19th Consumer Electronic Imaging Fair To Be Held On ...

View All
   
   
 
 

home archives contact us advertise with us
           
Magazines Portals Directories Events News Verticals Educational Institute  
Electronics for You
Open Source for You
Electronics Bazaar
electronicsforu.com
efytimes.com
opensourceforu.com
electronicsb2b.com
Electronics Annual Guide
EFY EXPO INDIA
EFY EXPO WEST
ELECTRONICS ROCKS
EFY Awards
OSIDAYS Expo
Electronics
Infotech
Linux & Open Source
Consumer Electronics
Science & Technology
BPO
EFY Techcenter

Educational Kits
Kitsnspares.com  
 
 
© Copyright 2014 EFY Enterprises Pvt. Ltd.
All rights reserved. Reproduction in whole or in part in any form or medium without written permission is prohibited.
Usage of the content from the web site is subject to Terms and Conditions