solar pv – balance of systems
TRANSCRIPT
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Solar PV – Balance of Systems
Madhavan Nampoothiri, IPLON GmbH
Meenakshi College, Chennai – February 2, 2012
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Overview
• About iPLON GmbH• What is BOS?• Inverters• Mounting structures• Cables and connectors• Performance monitoring systems• Conclusion
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About iPLON GmbH
German company with a strong Indian connection!
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- Founded by Mr. Victor Thamburaj
- Alumnus of IIT Madras
- Worked in senior positions in German companies before starting iPLON
- Trained Electrical Engineer
The Indian connection
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Schwäbisch Hall – A charming small town in South Germany
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iPLON GmbH- Total lifecycle management
of Solar farms
- Installed more than 150 MWp in Germany and Italy
- Located in Schwäbisch Hall, North of Stuttgart
- India office in Chennai
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Products and Services of iPLON
EPC
Solar Infranet(iAT, iMT, Internet connectivity)
String Monitoring
Inverter Monitoring
Environ-mental Sensors Monitoring
AC Power Metering (Evc. Point)
Trans-former / Grid connected comp. Monitoring
System Engineering Reviews Document. Project Mgmt.
Services O&M
Comissioning
Training & Workshops
Application and Application Support
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What is BOS?
Everything in the “gap” between PV modules & the Grid
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PV System
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PV modules – The most visible part of a PV system
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BOS – The unglamorous cousins of PV modules
– Power Electronics• Inverters
– Mounting Structures• Racking - Fixed tilt• Tracking systems
– Single axis– Dual axis
– Cables and connectors– Performance monitoring systems
• Weather stations• Local monitoring(SCADA – PC based)• Remote monitoring(Web based)
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PV SystemPV modules
Inverter
MountingStructure
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Inverters
DC to AC Converter
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What Inverters are good for..
• Converting DC to ACFancy Fourier
Transformation
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Inverter features
• High Efficiency• Low standby loss• Frequency regulation(50 Hz in India)• Harmonic distortion control• Ease of servicing• Reliability• Power correction factor
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Type of Inverters
• Central Inverters(Dominant in emerging markets)
• String Inverters(Preferred in European markets)
• Micro- Inverters(Still in development)
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Central-Inverters vs.
String-Inverters
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PVModul
e
Field Termin
al
Field Termin
al
Central Inverter
Central Inverter
Still on DC Level!
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PVModule
Inverter
Inverter
Grid
Already on AC level!
String Inverter
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Typical String-Inverters
Source: SMA, Power One, Kaco
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Typical Technical Data
Source: SMA
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Typical Central Inverters
Source: SMA, Power One
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Typical Technical Data
Source: SMA
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Topology
• Two options:–Design for „Central Inverters“–Design for „String Inverters“
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Central Inverters
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Central Inverters
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String Inverters
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String Inverters
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ComparisonCentral String
Costs + +
Maintenance + ++
Size of plant Large scale only Small to very large
Efficiency + ++ (individual MPP tracking)
MPP Tracking O ++
Cables O ++
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Mounting Structures
Modules’ long lasting companion
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The support..
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Mounting structures
• The structuring that supports the modules• Typically aluminum, galvanised iron• Should be corrosion resistant• Choose depending on soil, wind and weather
conditions!• Overwhelming majority : Fixed tilt• Rare: Single or double-axis trackers
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Mounting Structures
• Fixed Tilt• Single Axis• Double Axis
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Fixed tilt in Open Areas
Source: Schletter
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Fixed tilt in Open Areas
Source: Schletter
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Fixed tilt in Open Areas(Adjustable)
Source: Schletter
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Tracking systems
Type of Tracking systems– Manually operated
– Motor operated• Single Axis• Dual axis
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Manually operated
Available in both single axis and dual axis modes
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Motor Operated
Source: Linak AS
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Motor Operated
Source: Linak AS
Single axis
Dual axis
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Cable and Connectors
The electricity carriers
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Cables
Source: LAPP
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Source: Amphenol
Source: MC
Source: MC
Connectors
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Performance monitoring systemsOperation and Maintenance
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Remote Monitoring
• Remote Monitoring– Gain insights into string current– String voltage– Inverter performance– Error-messages– Weather conditions
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Weather measurement
• Energy output directly related to ambient conditions like
– Amount of sunlight(Irradiation)
– PV Module temperature
– Ambient temperature
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Irradiation sensors
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Module and ambient temperature meaurement
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Data logging and energy metering
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iPLON Systems
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Performance Monitoring Systems
– Weather stations– Local monitoring(SCADA – PC based)– Remote monitoring(Web based)
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PERFORMANCE RATIO
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Performance Ratio
• Performance Ratio = Most important factor of a Solar PV System!– Performance independent from weather condition– True efficiency of the plant
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Installation
Concept – to - reality
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Installation – Also part of BOS
– Engineering and Design– Project Management– Civil work
– Laying foundation for mounting structures and installation of modules on mounting structures
– DC/AC cabling– Transformer and switch yard construction
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Conclusion
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Appendix
• Resources– SMA.com?– Sunchaser.com?– Others?
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Typical Technical Data(String Inverter)
Source: Power One
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Typical Technical Data(String Inverter)
Source: Kaco
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Typical Technical Data(Central Inverter)
Source: Power One