| Abstract |
The dispersed generations (DGs) are expected to increase. The output power of DGs fluctuates, making AC system interconnection problematic. As DC-to-AC converters of DGs generate harmonics, the harmonics lead to degradation of power quality, too. In the paper, we explain the control method for smoothing power fluctuations and the principle and operation of the active filter function of PQC. We also describe the results of operational verification tests we conducted using a 7-kVA prototype in a simulated transmission. The test results show that the PQC held system voltage fluctuations to under 8\% even in large power changes and reduced 5th and 7th harmonics by less than 30\%. Finally, the power quality controller is confirmed to be useful for improving power quality of AC grid systems introduced dispersed generations. |
