Abstract
When Neutral Point Clamped (NPC) three-level photovoltaic grid-connected inverter is overloaded or in short state, the control by software could not judge immediately, but the power switch components of the inverter would be broken. The technology of Pulse by Pulse is an important method to protect the power switch components. This paper studies the principle of traditional technology of Pulse by Pulse, then analyzes a new technology of Pulse by Pulse based on Complex Programmable Logic Device (CPLD), finally a 3KW NPC three-level grid-connected inverter is set up with the new technology of Pulse by Pulse and the feasibility is demonstrated through the experiments.
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