Abstract
This paper proposes a Fault Ride-Through (FRT) operation for a single-phase grid-tied inverter with an active power decoupling capability. The power decoupling circuit achieves the double-line-frequency power pulsation compensation with a small capacitance; consequently, a transient response with a sudden load change becomes worsen because a large energy buffer, i.e. bulky electrolytic capacitors, does not apply. In particular, high overshoot voltages occur in a DC-link voltage when the grid voltage sag of the single-phase grid occurs, resulting in the interrupt of the FRT operation due to the over voltage protection. In order to solve this problem, the buffer capacitance is designed in the consideration of the overshoot amount of the DC-link voltage. The theoretical value of the overshoot amount is verified with a l-kW prototype. As an experimental result, The error between the experimental and the calculation value is within 10%. Furthermore, the proposed control achieved both the FRT operation and the active power decoupling capability.
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