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Projekt „ESSNBS“ Niš, November 4 th 7 th , 2012 - 1 - DAAD Experimental verification of Experimental verification of single-phase PLL with novel two- single-phase PLL with novel two- phase generator for grid-connected phase generator for grid-connected converters converters Slobodan Lubura, Milomir Šoja, Srđan Lale, Marko Ikić The Faculty of Electrical Engineering, University East Sarajevo, East Sarajevo, Bosnia and Herzegovina

Slobodan Lubura, Milomir Šoja, Srđan Lale, Marko Ikić

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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. - PowerPoint PPT Presentation

Text of Slobodan Lubura, Milomir Šoja, Srđan Lale, Marko Ikić

Kein Folientitel- * -
Experimental verification of single-phase PLL with novel two-phase generator for grid-connected converters
Slobodan Lubura, Milomir Šoja, Sran Lale, Marko Iki
The Faculty of Electrical Engineering, University East Sarajevo, East Sarajevo, Bosnia and Herzegovina
Projekt „ESSNBS“
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The general structure of single-phase PLL based on SRF theory
Projekt „ESSNBS“
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The new two-phase generator with DC offset rejection realized in
Simulink environment
Projekt „ESSNBS“
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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.
Projekt „ESSNBS“
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Experimental results of proposed PLL
Block-diagram of proposed PLL topology realized in Simulink using Real Time Windows Target library
Projekt „ESSNBS“
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The response of two-phase generator on grid voltage with noise
Projekt „ESSNBS“
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Experimental results of proposed PLL – continuous model of PLL
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
a)
b)
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Experimental results of proposed PLL – continuous model of PLL
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
a)
b)
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Experimental results of proposed PLL – continuous model of PLL
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Input grid voltage with 30% DC offset and generated reference
voltage.
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Tustin approximation
Schneider approximation
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(step changes of grid parameters)
Ts=50μs
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(step changes of grid parameters)
Ts=50μs
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DAAD
Conclusion
The results show that proposed PLL (both continual and discrete) can solve important issues of presence of DC offset and noise in measured values of grid voltage.
Proposed PLL can be used for both, grid-connected systems (e.g. Photovoltaic and Wind turbines) and power condition equipment (uninterruptible power supply (UPS), active filters) which rely on PLL based synchronization.
The further work should be implementation of proposed PLL topology on digital platform (using dsPIC).
Two-phase
generator
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grid_measured
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α
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β