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Impact of PV-inverters, associated products and service on ... · ISFH, Hameln, Germany, September...
Transcript of Impact of PV-inverters, associated products and service on ... · ISFH, Hameln, Germany, September...
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Impact of PV-inverters,
associated products and service
on the performance of grid-tied PV-Systems
Mike Meinhardt,Marko Werner
SMA Technologie AG Niestetal, Germanywww.SMA.de
PVPS Task 2 / ISFH Workshop:High Quality PV systems
ISFH, Hameln, Germany, September 28, 2005
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SMA Technologie AG
n Founded in 1981
n Technology leader and trend-setter in PV system technology
n More than 800 MVAAC PV inverter power installed
n Headquartered in Niestetal, Germany
n Approx. 1,000 employees worldwide, more than 15 % are engineers
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Over 800 MWAC power installed since 1981 with SMA Sunny Boy® PV-Inverters
Federal Ministry of Economics, Berlin Airport, MunichTraining Center, Herne
Shenzhen, China White House, Washington DCOlympia Boulevard, Sydney
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Outline of Presentation
1. Introduction
2. Holistic and integral approach to responsibility of PV inverter manufacturer for the performance of PV systemso PV-invertero Additional components / Accessorieso Training, Support and Service
3. Possibilities for a inverter manufacturer to impact on the PV system performance in different phases o Designo Commissioningo Operationo Optimisation
4. Conclusion
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PV inverter is heart and brain of PV system
Solar-ModuleDC Cabeling AC Cabeling
MainsPV inverter
=
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n The inverter is the heart (and the brain) of a PV system and therefore has a huge impact on the PV system performanceo energy yield, performance ratio, profitability …
n But …
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Holistic and integral approach to responsibility of PV-inverter manufacturer
n The responsibility of the PV inverter manufacturer goes far beyond the very manufacturing of the inverter.
n In the sense of a holistic point of view the PV inverter manufacturer’s impact on an optimum system performance comprises:
o High quality inverter with optimum customers benefit– Reliability, lifetime, efficiency, feature set …
o Associated products and additional components for an overall system design
– Communication, monitoring, data-logging …
o Support and Service
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Four phases for PV inverter manufacturer’s con-tribution to an optimum PV system performance
n The inverter manufacturer can contribute to an optimum system performance in the following four phases of PV system life
1. PV system design– A proper PV system design is the foundation for an optimum
performance and yield
2. PV system commissioning– Skilled and well-trained personnel supported by plug-and-play
and failure-tolerant inverters on-site
3. PV system operation– Robust, long life inverter with high efficiency and low failure rate
4. PV system optimization– Data-logging, monitoring, visualisation, evaluation, know-how
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1. PV-System Design Phase
n PV-System design can positively influence the performance in respect ofo Broad product range for selection of the inverter with the most
appropriate nominal AC power (opt. ratio: nom. inverter AC power / PV MPP power = 0.9)
o Wide input voltage for flexible system design using variety for PV-Modules
o (Multi-)String concept for most flexible PV system design (shading, number of modules per string)
o PV-System design tool comprising all PV-modules and knowledge about local weather conditions
o Training of planner and installer of PV-system
!
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SMA Training of planners and installers
n Tutorials and practical training courses in the field of:
o Sunny Family (PV-system design, commissioning and optimisation usingString inverters …)
o Sunny Central (design, commissioning of PV systems using central inverters)
o Sunny Communication (interfaces, serial and wireless communication,data-logging, visualisation ...)
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2. PV system commissioning phase
n PV-System commissioning can positively influence the performance in respect of
o Complexity of DC-cabling reduced to the minimum with String-Technology
o Inverter interfaces: easy to use Plug-and-play
o Failure-tolerant inverter design– reverse polarity protection, miswiring protection (DC vs. AC connection),
o Installation manual (focusing on practical aspects, easy understandable)
o Training on the job
o Competent and experienced service and support (hot-line) for trouble shooting on-site
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Easy to use inverter interfaces - Plug-and-play
n Simplification of System InstallationoMulti-Contact®-Plugs (or others) for connection of PVo Plug for communication connection or
wireless communicationo AC-Plug
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3. PV system operation phase
n PV-System operationo High efficiency of Inverter
o Local, intelligent and adaptive MPP-Tracking per String
o Robust inverter design – Over-voltage protection (DC- and AC-Side)– Over-temperature protection
o Low failure rate of inverter
o Redundant PV-system concept (String-Concept)
o Diagnosis capability of inverter and associated products– Failure indication, warnings, data-logging, remote access
o 24-hour-Service (replacement of inverter)
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Robust inverter design
n Over-voltage protection n Over-temperature protection
thermal fused varistors temperature sensor
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Low failure rate of inverter
n Actions taken for highest reliability if PV inverterso R&D-focus “Design-for-reliability”
o Minimum number of components (high level of integration)
o Inverter design optimised for manufacturability
o Cable-free assembly of inverter components
o Comprehensive test program – Climate chamber tests– Temperature tests – Salt spray testing– Drop tests – Vibration tests– EMI tests (radiated, conducted)– Visual inspection for each inverter– Functional test for each inverter– Burn-in for each inverter– Surge tests for each inverter
[Source: www.EUPEC.com]
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4a. PV system optimisation by customer
n PV System optimisation by customero After commissioning a optimisation and monitoring phase for
a limited duration (e.g. 3 months) is typical
o Monitoring, Data-aquisition and storage
o Comparison of energy yield and behaviour with other systems or based on experience / weather data
o Evaluation and optimisation of PV system performance carried out by owner or installer
o SMA-Tools: Sunny Beam®, Sunny Portal®, Sunny WebBox®
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4b. PV system optimisation by SMA
n PV system optimisation and supervision by SMAo Continuous monitoring, evaluation and optimisation of PV
system performance by SMA Service Centre
o Fastest possible identification of failures and response of service
o Identification of very slow and hardly noticeable changes in PV system performance and preventive service
o Identification of hidden failures or defects
o Analysis of failures causes e.g. grid, generator, inverter …
o SMA-Tools: Sunny WebBox®, Sunny Portal®, Service
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Conclusion
n The inverter has a big influence on the performance and behaviour of PV systems
n Beside the inverter, additional components and service together make a good energy yield possible in the four different phases of PV system life:o Design, Commissioning, Operation, Optimization
n Quality of products and services is the key to satisfied customers
n Feedback of customers and third parties is vital for future progress in the field of quality