Hybrid switch use for light load efficiency improvement of a power inverter for stand-alone residential renewable energy system

Hybrid solar inverter for grid synchronization

“…It eliminates the dc component in the signals from one circuit to the other but allows the ac components in signals to pass [15]. The primary and secondary winding can be designed as step up or step down transformer to match the load in electrical system.…”

Analysis of a Power Inverter Design Considering The Demand Characteristics of a House With Renewable Energy Sources

“…Ancak, bir sonraki bölümde ele alınacağı gibi tekil bir evin elektrik güç talebi geniş bir aralıkta değişmekte ve büyük oranda düşük güçlerde kalmaktadır [1]. Bu nedenle, yenilenebilir enerji kaynaklarından beslenen bir evde kullanılacak inverter devresinin veriminin özellikle düşük güç bölgesinde iyileştirilmesi gereklidir [1]- [3]. Bu amaçla, bu çalışmada evsel güç talebi karakteristiğini dikkate alarak inverter devresinin çıkışında kullanılan LC filtre devresindeki L değerinin yük akımına göre değişken olması durumunun inverter devresinin düşük güç bölgesindeki verimi üzerine etkisi incelenmiştir.…”

Improving inverter efficiency at low power by reducing switching frequency

“…The choice of the switching frequency involves a trade-off between requirements for high efficiency, sinusoidal output power quality, and low cost [3]. Switch conduction losses will decrease as the power level drops, however switching losses can remain high enough to decrease the efficiency of the inverter during light load conditions which is the case for most of the time of the day and even night for inverters used in residential applications [4], [5]. The power quality is an issue in grid connected inverters and there may be a need to comply with standards such as IEEE Std 1547 [6], but in stand-alone systems power quality is not subject to these constraints.…”

“…The ZVS and ZCS techniques have some drawbacks such as a significant voltage stress on the antiparallel diode of the switch, which increases the conduction losses. The use of a parallel IGBT-MOSFET switch combination, referred to as a hybrid switch, is analyzed for efficiency improvement at light load conditions (400-500W) in [18] but the improvement was found insignificant by the researchers. Hence, there is a lack of study on inverter efficiency improvement at very light load profiles (i.e.…”