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Slobodan Lubura, Milomir Šoja, Srđan Lale, Marko Ikić

Experimental verification of single-phase PLL with novel two-phase generator for grid-connected converters. Slobodan Lubura, Milomir Šoja, Srđan Lale, Marko Ikić The Faculty of Electrical Engineering, University East Sarajevo, East Sarajevo, Bosnia and Herzegovina. Introduction.

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Slobodan Lubura, Milomir Šoja, Srđan Lale, Marko Ikić

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  1. Experimental verification of single-phase PLL with novel two-phase generator for grid-connected converters Slobodan Lubura, Milomir Šoja, Srđan Lale, Marko Ikić The Faculty of Electrical Engineering, University East Sarajevo, East Sarajevo, Bosnia and Herzegovina

  2. Introduction The general structure of single-phase PLL based on SRF theory

  3. Novel two-phase generator with noise and DC offset rejection The new two-phase generator with DC offset rejection realized in Simulink environment

  4. Novel two-phase generator with noise and DC offset rejection • Proposed structure of novel two-phase generator can be presented with following transfer functions: • Both (1) and (2) represent transfer functions of band-pass filters.

  5. Experimental results of proposed PLL Block-diagram of proposed PLL topology realized in Simulink using Real Time Windows Target library

  6. Experimental results of proposed PLL – continuous model of PLL The response of two-phase generator on grid voltage with noise

  7. Experimental results of proposed PLL – continuous model of PLL a) b) • Input grid voltage with 30% DC offset and estimated grid amplitude, without control loop for DC offset rejection • Input grid voltage with 30% DC offset and estimated grid frequency, without control loop for DC offset rejection

  8. Experimental results of proposed PLL – continuous model of PLL a) b) • Input grid voltage with 30% DC offset and estimated grid amplitude, with control loop for DC offset rejection • Input grid voltage with 30% DC offset and estimated grid frequency, with control loop for DC offset rejection

  9. Experimental results of proposed PLL – continuous model of PLL Estimated grid frequency (top) and amplitude (bottom) forki = 10, 100 and 500 (robustness against step changes of grid frequency and amplitude)

  10. Experimental results of proposed PLL – continuous model of PLL Input grid voltage with 30% DC offset and generated reference voltage.

  11. Experimental results of proposed PLL – discrete model of PLL • Discretization of proposed PLL was performed in two ways: Tustin approximation Schneider approximation

  12. Experimental results of proposed PLL – discrete model of PLL Ts=50μs Estimated grid amplitude for two discrete models of PLL (step changes of grid parameters)

  13. Experimental results of proposed PLL – discrete model of PLL Ts=50μs Estimated grid frequency for two discrete models of PLL (step changes of grid parameters)

  14. Conclusion • The results show that proposed PLL (bothcontinual and discrete) can solveimportant issues of presence of DC offset and noise inmeasured values of grid voltage. • Proposed PLL can be used for both, grid-connected systems (e.g.Photovoltaic and Wind turbines) and power conditionequipment (uninterruptible power supply (UPS), activefilters) which rely on PLL based synchronization. • The further work should be implementation of proposed PLL topology on digital platform (using dsPIC).

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