grid connected rooftop solar power plant at silicon

Grid Connected Solar Power Plant at Silicon

Seminar ByNavneet Das1301209054

Under The Guidance ofNivedita Pati

Contents IntroductionGreen Campus InitiativeNecessity of rooftop power plant in Silicon Rooftop plantsGeneral aspectsBlock diagramComponents usedPerformance DetailsCost benefit analysisConclusion

IntroductionNon renewable energy sources will become exhausted

by the year 2050.No other notable energy source has been invented yet

or will take time to commercialize on a global scale. Pollution is being a major factor against non

renewable energy sources.So under the green campus initiative, Silicon installed a

30 KW solar power plant for meeting its local loads.

Green Campus Initiative Student initiative of University of Cape Town( South Africa) for

sustainable and environment friendly campus.

This has also been taken up by universities such as Havard University (Massachusetts, USA) MIT ( USA) IIT Powai KIIT University

Silicon Bhubaneswar has also joined the legacy by installing an on grid30kW rooftop solar power plant.

Necessity of Solar Power Plant in Silicon

Monthly electrical energy requirement is 1 lakh units (KWh).

Monthly bill :8-10 lakh Rupees.

Fine is imposed due to over consumption of reactive power.

Hence to ease some load off the grid, the power plant was installed to cater local needs.

Rooftop Solar Power PlantOFF GRID: Here power is stored in batteries which

are later inverted and sent to loads.

ON GRID: The inverter associated with solar plant is directly connected to local grid with suitable frequency.

Silicon has on grid power system.

General Aspects

30 KW on-grid solar power plant at Silicon Institute Of Technology, Bhubaneswar

Contd…

No. of panels: 117 Panel rating: 315 Wp ,24 V No. of DC strings: 6 Estimated annual power output:40-45 MW Inverter: Delta RPI string inverter Inverter capacity: 30 KW. Cost of installation: INR 1.75 Million

Block Diagram

Components Used

Solar PV cell

Material:Mono Crystalline( Silicon cut into wafers)

Maximum output:315KWp Arranged in 6 rows(3x19 & 3x20) Efficiency: 15% So ideal power output=

315KW*117 panels

=36.8KWh

Components UsedInverter

• String Inverter: Single inverter connected for whole system connected in series and parallel.

• Input DC voltage:480-800 V• Max input Current:68 A• 2 internal MPPT’s.• Output Power: 30KVA• Output Voltage: 3Ph, 440V, 50Hz• Efficiency: 98%• Reactive Power: 0.8cap-0.8ind

Components Used

Distribution Panel• Consists of 3 Phase

connection to local grid of Silicon.

Protection Devices

• Fuses• Surge Protectors

Components Used

Net Meter• Bidirectional• Measures both imported

and exported energy

Data Logger Used for monitoring RJ45 connector to LAN

Output Power CalculationSolar Resource Data-India• Satellite data of a location for estimated solar radiation• Details of power plant (Capacity, Azimuth, Tilt, Losses)• Annual output power: 44 MW

Calculation using Capacity Utilization Factor(CUF)

• CUF of Bhubaneswar is 14%• Output= Power rating x CUF x 24hours x 365 days

= (30 KW ) x (0.13) x (24) x (365) ~42 MW annually

•

Performance Details Graph

Fig 3 Power output for 16/03/2016

Performance Details

Performance Details

Month Avg Daily Units(KWh)

Total Units(KWh) Money saved(INR)

March 159 4938 38,000

April 160 4803 37,000

May 149 4614 34,000

Cost Benefit Analysis

Total cost ~ 17.5 lakhs (30% subsidy) Annual power generated ~ 41 MW Financial equivalent ~ 3.28 lakhs(INR 8 per unit) Break even ~ 7 Years (8% interest) Life Span ~ 25 Years

Direct Profit ~ INR 6 million

Future Expansions

If whole rooftop of Silicon is utilized

• The total area covered would be 7-8 times the present area.

• Total generation would be 328 MW

• Almost one-fourth of total load demand can be met by solar plant.

Solar at your Home 1 m sq. of solar panel gives around 200 W For a 10 m sq area, total power= 2000 W (or 2KW) So monthly power generated= 200 units

Almost half the load demand of a normal home(without AC)

Alternatively, DC output from PV panel can be connected to the charging circuit of inverter.

Conclusion Total power produced annually is ~42 Mega Watts.

Profit of ~3 lakhs per year after break-even.

Clean source of energy.

One time investment, long term returns.

Government subsidies available.

References www.pvwatts.nrel.gov/

For calculation of power generation. www.energysage.com/

For basic solar energy know hows Digital Digest

For statistical data: Prof. R. P. Panda

Queries are welcome

Thank You