| Title |
Characteristics of Utility Transformer on Household Single-Phase ESS-PCS According to LC Filter Location |
| Authors |
Yong-Jung Kim ; Hyosung Kim |
| DOI |
https://doi.org/10.6113/TKPE/2018.23.2.101 |
| Keywords |
ESS(Energey Storage System) ; PCS(Single-phase Power Conditioning System) ; Transformer ; LC filter ; Voltage transfer ratio |
| Abstract |
Shortage of electric power occurs frequently along with increased electric power demand. ESS is a precaution to solve this issue. Household ESS has a capacity of approximately 3 kW/7 kWh. Household ESS batteries are typically designed with nominal voltages between 40 and 50 V. To connect household ESS with a 220 V AC system, low battery voltages in power conditioning system (PCS) should be boosted. To boost low battery voltage and match it with AC grid voltage, the use of a transformer for a commercial frequency can be considered. To attenuate switching harmonics of the household single-phase ESS-PCS, LC filter can be installed in two positions: on the primary side or on the secondary side of a transformer. A method has been used generally in single-phase inverters for the ESS-PCS. In another method, however, the output efficiency of the ESS-PCS may be decreased. Parasitic components of the transformer can affect voltage losses, when the square wave with the switching frequency in the ESS-PCS is passed through the transformer windings. In this work, the characteristics of the transformer according to the position of an LC filter are investigated for household single-phase ESS-PCS. |