TECHNICAL PAPER ON SOLAR PV INSTALLATION & DESIGN AT IIT BHUBANESWAR

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1 TECHNICAL PAPER ON SOLAR PV INSTALLATION & DESIGN AT IIT BHUBANESWAR 1. INTRODUCTION Sun is an amazing resource which radiates energy and provides us both heat and light by fusing hydrogen into helium at its core. We call this as solar radiation. Sunlight, or solar energy, can be used directly for heating and lighting homes and businesses, for generating electricity, and for hot water heating, solar cooling, and a variety of other commercial and industrial uses. Most critical, given the growing concern over climate change, is the fact that solar electricity generation represents a clean alternative to electricity from fossil fuels, with no air and water pollution, no global warming pollution, no risks of electricity price spikes. IIT Bhubaneswar as part of green campus initiative has installed 490kWp of solar installations (grid connected mode) on various buildings as per the details given below. This paper gives brief overview about the project. S. No Building Description Capacity in kwp 1 Grade-C Staff Quarters Community Centre Guest House Grade-A Faculty Quarters Seater Girl s Hostel Seater Boy s Hostel School of Electrical Science st Year Lab complex numbers Workshop shed TECHNICAL DESCRIPTION OF THE PROJECT After site survey on each identified building rooftop and based on the available space, capacity of solar rooftop generation on each building has been calculated for installing panels. It is based on the fact that average solar panel is around 17.6 square feet and produces 265 watts under direct sunlight per day, equaling out to 15 watts per square foot. To explain the project details, guest house building is taken as the reference as shown in the figure 1. Stringing design S1, S2 and S3 consists of 2 strings of 17 no s 300Wp modules with MPPT (Max Power Point Tracking) capability. These 3 strings with suitable single core cables has been connected to 3 number of Delta make inverters with 10KW rating. The

2 inverter has communication capability to communicate with data logger device on either GSM modem or LAN interface to cloud computing system where daily generation data is logged. All the strings and inverters are earthed to ground. Figure 1: Grid connected solar PV system The inverter output is connected to AC sub junction box using 3-phase 4-wire copper cables. The AC sub junction box helps in connecting AC output to 3-phase bus bars with neutral using 32 A 4-pole MCB for safety and protection. The bus bar terminals are further connected to meter box with 100 A 4-pole MCCB. This MCCB can connect/disconnect the entire solar PV generation unit from grid based on the conditions on grid side. The energy meter installed by CESU measures the amount of solar generation for accounting purpose using a 100/5 A 0.5 class CT with a burden of 10VA. The solar PV output is connected to the grid at 400A incomer using AC distribution box with suitable protection mechanism. In nut shell, The sun shines on the solar panels generating DC electricity The DC electricity is fed into a solar inverter that converts it to 240V 50Hz AC electricity.

3 6/1/2018 6/2/2018 6/3/2018 6/4/2018 6/5/2018 6/6/2018 6/7/2018 6/8/2018 6/9/2018 6/10/2018 6/11/2018 6/12/2018 6/13/2018 6/14/2018 6/15/2018 6/16/2018 6/17/2018 6/18/2018 6/19/2018 6/20/2018 6/21/2018 6/22/2018 6/23/2018 6/24/2018 6/25/2018 6/26/2018 6/27/2018 6/28/2018 6/29/2018 6/30/2018 The 240V AC electricity is used to power appliances in building. Surplus electricity is fed back into the main grid. At the heart of small-scale, grid-tied energy-harvesting systems the inverter delivers excess power to the grid during periods of high energy from PV sources. The grid-tied inverters ensure that this excess power is tightly synchronized to the grid, typically through the use of sophisticated phase-locked loop (PLL) implementations. When driving power to the grid, grid-tied inverters provide a stable, sinusoidal AC waveform that matches grid voltage and frequency according to utility standards. Poor synchronization can lead to load imbalances, damage to connected equipment, instability in the grid, and even power outages in the grid itself. In power-utility facilities, grid synchronization relies on control of the speed of massive turbines and generator motors used to generate power. In an energyharvesting system, however, grid synchronization relies on control of the inverter s full-bridge output stage used to produce the required AC waveform. In most inverter designs, a PLL provides the mechanism at the heart of this synchronization process. In its basic form, a grid-synchronization PLL combines a phase detector (PD), filter, and voltage-controlled oscillator (VCO) SOLAR GENERATION DETAILS The solar generation was commissioned on 22 May 2018 for testing purpose and successfully integrated with grid on 4 th June The generation profile of the June month is given below in figure 2, 500 TOTAL 490KWp ENERGY METER READING 0 Figure 2: Solar Generation Details for the month of June 2018

4 The total units generated for the month of June 2018 are kwh which accounts to Rs. 2,69,407 at 5.35 Rs per unit. The highest generation was observed on 16 June with 2603 units generated and least on 26 June with 436 units where there was a continuous rain fall on that day. The detailed generation report is shown in below table,

5 4. CONCLUSION Photovoltaic and solar-thermal panels generate free electricity by converting sunlight into electricity or transferring the sun's heat to heating and ventilation systems. The use of solar panels to generate energy provides many benefits, which include reductions in the costs associated with generating electricity. Solar panels also provide pollution-free power sources and afford new levels of independence to energy consumers. Every campus should strive to be green and IIT Bhubaneswar sets an example in this context by being the first solar generation institution in Odisha at 33kV level consumer under CESU jurisdiction.

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