Performance evaluation of transformerless photovoltaic inverter

ABSTRACT

The instantaneous power of 1-$\varphi$ solar photovoltaic system comprising of high-gain DC-DC converter and 1-$\varphi$ photovoltaic inverter has a twice line frequency that creates the undesirable second order harmonic current. This paper provides topological changes in both DC-DC converter and DC-AC inverter to mitigate the undesirable second-order harmonic current. Re-boost converter is used instead of boost converter, and power decoupling-based 1-$\varphi$ inverter is used for the inverter purpose. To provide adequate DC-link voltage, standard maximum power point tracking scheme is used. To control the output of inverter, fixed-frequency sliding mode controller is used that provides better response in steady state as well as transient state conditions.

KEYWORDS:

• Second order harmonic
• DC-DC converter
• DC-AC inverter
• sliding mode controller

Disclosure statement

No potential conflict of interest was reported by the author(s).