| Title |
Synchronization Techniques for Single-Phase and Three-Phase Grid Connected Inverters using PLL Algorithm |
| Authors |
Tae-Won Chun ; 李Hong-Hee Lee ; Heung-Geun Kim ; 魯Eui-Cheol Nho |
| DOI |
10.6113/TKPE/2011.16.4.309 |
| Keywords |
PLL; synchronization; Grid-connected inverter; Proportional controller |
| Abstract |
A PLL system has widely used for synchronizing the grid voltage at the grid-connected inverter for supplying power from the PV generation systems. In this paper, a PLL algorithm without both the loop filter and PI controller is suggested for improving the performance of synchronization at the single-phase and three-phase grid connected inverters. In order that the output voltage of a phase detector in the PLL has only a dc voltage, and it approaches to 0 when the synchronization signal is locked to the grid voltage, the feedback signals are determined by using two-phase voltages. After the PLL system with a proportional controller is modelled with the small signal analysis, the stability and steady-state error are investigated. Through the simulation studies and experimental results, the performances of the proposed PLL algorithm are verified. |