STRING INVERTERS IN ROOFTOP SOLAR Anish Wastrad Fronius India Pvt Ltd.
SCHEME OF A GRID CONNECTED PV SYSTEM / 1. PV generator floating (no connection to ground) / 2. Inverter (with or without transformer) / 3. Circuit braker for overcurrent protection / 4. RCD to protect from residual fault currents on the AC lines / 5. Energy meter to measure the produced energy 1 2 3 4 5 = NL L1 N L2 L3 ~ PE 2
WHAT TASKS DOES THE INVERTER HAVE? / Transforming of energy Converting direct current generated in the solar modules into alternating current / Flexibility in sizing & Finding the best operating point Tracking the point of maximum power (MPP) of the PV generator / Providing DC + AC safety and Anti-islanding...according to norms and regulations (depending on country, region, power supplier, ) safe and fast disconnection in case of a failure / Monitoring center Information interface between PV system and customer via Display or additional Hardware (e.g. Fronius DATCOM)
FLEXIBILITY IN SYSTEM SIZING MULTI MPPT East-West different tilt angles partly shaded small side system MPPT1 MPPT1 / Should be able to cover 50-60% of P nom / U dcmax should be as high as possible MPPT2 / Should be able to cover 50-60% of P nom / U dcmax should be as high as possible / Should be able to cover 80-90% of P nom / U dcmax should be as high as possible MPPT2 / Should be able to cover 10-20% of P nom / U dcmin should be as low as possible 4 Fronius International GmbH / Fronius Service Partner Training Fronius SnapINverter / Februar 2015
DYNAMIC PEAK MANAGER / Example: Typical morning shade (e.g. chimney) 5 Fronius International GmbH / Fronius Symo 10-20 kw Service Training / February 2015
MAXIMUM FLEXIBILITY IN SYSTEM DESIGN P [kw] 4 3 P DC U DC P DC U DC without Dynamic Peak Manager With Dynamic Peak Manager 2 1,3 kw 1 Surplus energy Daily yield without DPM: Daily yield with DPM: ~0,5 kwh 26 kwh 26,5 kwh 0,3 kw 0 time = + 1,9 % yield 10:30 Example: Typical morning shade (e.g. chimney) 6 Fronius International GmbH / Fronius Service Partner Training Fronius SnapINverter / Februar 2015
PRODUCT OVERVIEW Safety features / Isolation measurement Active only before switching on (=in the morning) / RCMU / Anti Islanding / Polarity protection Via diodes in the DC semiconductor module short circuit / Overvoltage protection Overvoltage category 2 / 3 as usual Possibility to integrate external overvoltage protection (DIN rail) / Power derating (protection against overload and overtemperature)
ANTI-ISLANDING / Islanded operation means that a PV system energizes the grid even if the mains supply is shut down. / Typical reasons would be: / Grid is shut down for maintenance work / Grid outage due to broken lines (thunder storm, earthquake, ) / Such a situation would cause danger for people working on the grid 8 / Therefore a so called Anti-Islanding function is required in the inverter
INTEGRATED MONITORING Solutions for PV-systems with > 1 Inverters Solar Net WLAN/LAN
COMPREHENSIVE DATA COMMUNICATION / The Fronius Datamanager connects the inverter to the Internet, which allows the PV system to be accessed from any device with an Internet connection. / The Internet connection allows a wide range of monitoring and visualisation applications to be used both from Fronius and third-party suppliers. / Possibility of connection to sensors / Connection to the smart meter / implement a faster and more accurate feed-in control than with S0. / visualise and analyse power consumption in the home, as well as the self-consumption and supply rates on Fronius Solar.web. 10 Fronius International GmbH / first name and surname / Fronius Datamanager 2.0 / 0x.0x.20xx - v01
SELF-CONSUMPTION DISPLAY / Actual view of energy flows 11 Fronius International GmbH / first name and surname / Fronius Datamanager 2.0 / 0x.0x.20xx - v01
SELF-CONSUMPTION DISPLAY / Daily graphs DM2 screenshots 12 Fronius International GmbH / first name and surname / Fronius Datamanager 2.0 / 0x.0x.20xx - v01
EASY INSTALLATION & SERVICIBILITY / Identical installation procedure for every power class / Quick and easy servicibility on site to ensure reduced down time. / Ease to stock spares on site capability to replace any component. 13 Fronius International GmbH / first name last name / Titel of presentation / xx.xx.201x - v01
FRONIUS THREE DIVISIONS PERFECT CHARGING PERFECT WELDING SOLAR ENERGY 14 Fronius International GmbH / Fronius Service Partner Training Fronius SnapINverter / Februar 2015
THE SEEDS OF OUR NEW IDEAS 21 international Fronius subsidiaries Sales partners / representatives in more than 60 countries / As of December 31 st, 2013 15 Fronius International GmbH / Fronius Service Partner Training Fronius SnapINverter / Januar 2015
WHERE WE MANUFACTURE USA / Portage CZECH REPUBLIC / Český Krumlov AUSTRIA / Sattledt, Pettenbach Wels, Steinhaus / As of September 2014 16 Fronius International GmbH / Fronius Service Partner Training Fronius SnapINverter / Januar 2015
FRONIUS INDIA SOLAR DIVISION / Subsidiary formed in 2014 / Solar Energy division total inverter installations until Q1 2016 >16MW in India / 20 Service partners strategically located in key regions / In-house service & repair center ready to cater to quick resolutions 17 Fronius International GmbH / August 2015/ Preliminary proposal pv plant KnorrBremse
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