Mitigation of lower order harmonics in a grid-connected single-phase PV inverter

Kulkarni, Abhijit and John, Vinod (2013) Mitigation of lower order harmonics in a grid-connected single-phase PV inverter. In: IEEE Transactions on Power Electronics, 28 (11). pp. 5024-5037.

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Abstract

In this paper, a simple single-phase grid-connected photovoltaic (PV) inverter topology consisting of a boost section, a low-voltage single-phase inverter with an inductive filter, and a step-up transformer interfacing the grid is considered. Ideally, this topology will not inject any lower order harmonics into the grid due to high-frequency pulse width modulation operation. However, the nonideal factors in the system such as core saturation-induced distorted magnetizing current of the transformer and the dead time of the inverter, etc., contribute to a significant amount of lower order harmonics in the grid current. A novel design of inverter current control that mitigates lower order harmonics is presented in this paper. An adaptive harmonic compensation technique and its design are proposed for the lower order harmonic compensation. In addition, a proportional-resonant-integral (PRI) controller and its design are also proposed. This controller eliminates the dc component in the control system, which introduces even harmonics in the grid current in the topology considered. The dynamics of the system due to the interaction between the PRI controller and the adaptive compensation scheme is also analyzed. The complete design has been validated with experimental results and good agreement with theoretical analysis of the overall system is observed.

Item Type:	Journal Article
Publication:	IEEE Transactions on Power Electronics
Publisher:	IEEE-Inst Electrical Electronics Engineers Inc
Additional Information:	Copyright of this article belongs to IEEE-Inst Electrical Electronics Engineers Inc.
Keywords:	Adaptive Filters; Harmonic Distortion; Inverters; Solar Energy
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	05 Aug 2013 11:44
Last Modified:	05 Aug 2013 11:44
URI:	http://eprints.iisc.ac.in/id/eprint/46893

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