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This paper presents an active-clamp flyback microinverter for grid connected photovoltaic (PV) ac module system. The active-clamp circuit achieves the soft switching by allowing a negative current that discharges the output capacitor of the primary switch and zero voltage switching (ZVS) turn on is achieved. The active-clamp switch is also operated in ZVS. Therefore the switching losses of the high...
Feedforward control is reliable for rejecting fast and dynamic voltage disturbances in the grid. Mainly this scheme is implemented based on phase voltages of the wye connected configuration. Under unbalanced and distorted grid-condition, the online conversion of line-to-line values into the phase values is unworkable. In order to exploit full advantages of feedforward controller, an appropriate modulator...
This paper presents the performance evaluations of a zero current soft-switching pulse width modulation (ZCS-PWM) boost dc-dc converter with a practical active edge-resonant cell (AERC). The AERC treated and discussed herein has auxiliary diodes for suppressing voltage surges and current ringings at the commutations of active switches in the dc-dc converters. The voltage surges together with the current...
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