Novel low voltage ride through strategy of single-stage grid-tied photovoltaic inverter with supercapacitor coupled

This paper proposes a control method for improving the performance of single-stage photovoltaic (PV) inverter with supercapacitor coupled. Connecting by a bidirectional DC-DC converter, supercapacitor is then indirectly coupled to the common dc-link of whole inverter. Transient maximum power point tracking (Transient MPPT) method is employed to realize fast MPP tracking without causing obvious output distortion. At the same time, the operational performance of low voltage ride through (LVRT) is improved with the assistant of fast energy storage which helps inverters recover from voltage dip fault fast. All these theoretical findings are verified by Matlab simulation and constructed laboratory prototype.

[1]  Jae-Eon Kim,et al.  Design and control of Proportional-Resonant controller based Photovoltaic power conditioning system , 2009, 2009 IEEE Energy Conversion Congress and Exposition.

[2]  Friedrich W. Fuchs,et al.  Low voltage ride through capability of a 5 kW grid-tied solar inverter , 2010, Proceedings of 14th International Power Electronics and Motion Control Conference EPE-PEMC 2010.

[3]  G. Joos,et al.  Supercapacitor Energy Storage for Wind Energy Applications , 2007, IEEE Transactions on Industry Applications.

[4]  Poh Chiang Loh,et al.  Transient maximum power point tracking for single-stage grid-tied inverter , 2009, 2009 IEEE Energy Conversion Congress and Exposition.

[5]  Staffan Norrga,et al.  Grid integration aspects of large solar PV installations: LVRT capability and reactive power/voltage support requirements , 2011, 2011 IEEE Trondheim PowerTech.