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Inverter RD and Testing Activities at arsenal research

Renewable Energy Technologies. Contents. Lab testing as R

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Inverter RD and Testing Activities at arsenal research

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    1. Inverter R&D and Testing Activities at arsenal research Roland Bründlinger Business Unit Renewable Energy Technologies IEA PVPS Task 2 Meeting, 19.9.2006

    2. Renewable Energy Technologies

    3. Renewable Energy Technologies Why is lab testing necessary? During product development Feedback Concept Validation of prototypes and specs Research Performance of products Synergy with simulations: Calibration and validation of models Conformity assessment of new products

    4. Renewable Energy Technologies Safety Grid interface Safety of persons DC injection … Power Quality and EMC Emission and Immunity Performance during network disturbances Compatibility assessment …

    5. Renewable Energy Technologies

    6. Renewable Energy Technologies Factors Strong competition between inverter companies Efficiency as key argument for product selection Issues: ?=f(P,UDC,…) Efficiency – under which conditions? Unclear specifications by manufacturers Difficult to compare products Design factors (Input voltage window) Precise and meaningful measurements

    7. Renewable Energy Technologies

    8. Renewable Energy Technologies Climbing the hill

    9. Renewable Energy Technologies MPPT: Key component of the PV system First stage during energy conversion Direct influence on energy yield MPPT Characterisation Steady State accuracy: Straightforward to determine Dynamic accuracy: Difficult, no commonly accepted methods available Impact of irregularities in the I/V curve on the MPPT – partial shading of PV arrays

    10. Renewable Energy Technologies

    11. Renewable Energy Technologies Existing approaches not satisfactory

    12. Renewable Energy Technologies Results: Accurate weighing of steady state and dynamic conditions ?G_1s < 50 W/m2; ?G_5s < 160 W/m2 Test sequence

    13. Renewable Energy Technologies

    14. Renewable Energy Technologies Background: How much does partial shading impact the energy yield? Investigation of the performance of the MPPT under partially shaded conditions Examples for results: Whole day test ?Video1 MPPT Algorithm ?Video2

    15. Renewable Energy Technologies Examples for typical I/V curves: Comparison of tested MPPTs integrated into state-of-the-art inverters

    16. Renewable Energy Technologies

    17. Renewable Energy Technologies DISPOWER Project – Impact of Voltage harmonics Voltage dips and interruptions (most critical PQ events) Background (Causes, statistics, relevance) Voltage dips and DG – Open questions: Loss of energy and returns Dissatisfaction (Operators) Burden on components PQ events Voltage stability (at high generation density) Tests at 12 WR (~1500 Tests)

    18. Renewable Energy Technologies

    19. Renewable Energy Technologies Fast disconnection 85 % - 20 ms, Inv 4

    20. Renewable Energy Technologies Influence on MPPT 60 % - 40 ms, Inv 3

    21. Renewable Energy Technologies „Ride-thru“ 60 % - 80 ms, Inv 8

    22. Renewable Energy Technologies Generally high sensitivity against voltage dips – Reasons Grid monitoring Problems with current control at voltage recovery Dynamic performance determined by Current control MPPT Implementation of grid monitoring Lack of awareness Unclear requirements in standards – Immunity not concerned

    23. Renewable Energy Technologies

    24. Renewable Energy Technologies

    25. Renewable Energy Technologies Roland Bründlinger arsenal research Giefinggasse 2 A-1210 Wien ph: +43 (0) 50550-6355, f: +43 (0) 50550-6390 roland.bruendlinger@arsenal.ac.at

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