Title :
Single stage inverter for PV applications with One Cycle Sampling technique in the MPPT algorithm
Author :
Ribeiro, Hugo ; Silva, Fernando ; Pinto, Sonia ; Borges, Beatriz
Author_Institution :
lnst. de Telecomun., Inst. Super. Tecnico, Lisbon, Portugal
Abstract :
This paper introduces a single-stage, single-phase, inverter, for maximum efficient photovoltaic grid connection. The inverter is based in a full-bridge converter where a few diodes and one inductor have been added to enable single stage operation. The new topology provides an additional buck-boost converter function at the bridge level in order to extract the maximum power from photovoltaic (PV) panel. Non linear control is used to regulate the sinusoidal current injected in the grid and the PV voltage, so that maximum power point tracker, MPPT, is obtained. The new MPPT algorithm uses one cycle sampling technique to obtain the average value of the voltage and current in the panel with a small time delay. This technique eliminates errors introduced in the MPPT calculation, due to the switching ripple. The proposed algorithm also allows the operation of the control circuit at a lower frequency than the high switching frequency of the bridge converter transistors.
Keywords :
invertors; maximum power point trackers; nonlinear control systems; photovoltaic power systems; power generation control; MPPT algorithm; PV applications; bridge converter transistors; buck-boost converter; full-bridge converter; maximum efficient photovoltaic grid connection; maximum power point tracker; nonlinear control; one cycle sampling technique; photovoltaic panel; single stage inverter; Bridge circuits; Delay effects; Diodes; Inductors; Inverters; Photovoltaic systems; Sampling methods; Solar power generation; Topology; Voltage control;
Conference_Titel :
Industrial Electronics, 2009. IECON '09. 35th Annual Conference of IEEE
Conference_Location :
Porto
Print_ISBN :
978-1-4244-4648-3
Electronic_ISBN :
1553-572X
DOI :
10.1109/IECON.2009.5415029