Title :
A novel control strategy to suppress DC current injection to the grid for three-phase PV inverter
Author :
Tao Zhang ; Guofeng He ; Min Chen ; Dehong Xu
Author_Institution :
Coll. of Electr. Eng., Zhejiang Univ., Hangzhou, China
Abstract :
The limitation of DC current injection to grid is critical for transformerless grid-connected PV inverter. In this paper a novel control strategy for three phase PV inverter is proposed in order to suppress DC current injection to the grid. It is based on idea of accurately sensing the DC offset voltage of three-phase PV inverter output. Since each one of the DC components in the three-phase inverter output can be eliminated, DC injection current to the grid can be effectively suppressed. The control scheme is verified on a 20kW three phase PV inverter.
Keywords :
electric current control; invertors; photovoltaic power systems; power generation control; power grids; DC components; DC current injection suppression; DC offset voltage; control strategy; power 20 kW; three-phase PV inverter output; transformerless grid-connected PV inverter; Accuracy; Capacitors; Digital signal processing; Integrated circuits; Inverters; Phase locked loops; DC current injection; DC offset voltage; DC suppression loop; Park transformation; Three-phase PV inverter;
Conference_Titel :
Power Electronics Conference (IPEC-Hiroshima 2014 - ECCE-ASIA), 2014 International
Conference_Location :
Hiroshima
DOI :
10.1109/IPEC.2014.6869628
