| Title |
DC link Ripple Voltage Compensation of a Single-phase Grid-Connected PV System |
| Authors |
Jae-Geun Lee ; Jong-Woo Choi |
| DOI |
10.6113/TKPE/2012.17.5.377 |
| Keywords |
DC link; ripple voltage; single-phase grid-connected; PV system |
| Abstract |
A single-phase grid-connected PV system is known as suitable for housing of less than 3 kW. The DC link voltage in a single-phase PV system has necessarily twice component of fundamental wave. It makes high THD in the grid current. According to the problem, power quality is lower. Many engineers have studied about this problem. The most simple method is to use low pass filter on DC link voltage control. However it is affected by DC link voltage control bandwidth. If cutoff frequency is reduced to increase the performance of low pass filter, it also lowers DC link voltage control bandwidth. Second method is using band stop filter, it works good on steady state but not good on transient state. This paper proposes the new method for removing ripple voltage to get an exact current reference. It improves the responses on steady state and transient state. The performance was verified through computer simulation using MATLAB and actual experiments. |