1. bookVolume 6 (2021): Issue 1 (January 2021)
Journal Details
License
Format
Journal
eISSN
2543-4292
First Published
16 Apr 2016
Publication timeframe
1 time per year
Languages
English
access type Open Access

Grid-Tied Neutral Point Clamped based Centralised Photovoltaic Inverter with Improved DC Link Voltage Balancing and Harmonic Minimisation Control

Published Online: 15 Nov 2021
Volume & Issue: Volume 6 (2021) - Issue 1 (January 2021)
Page range: 185 - 203
Received: 29 Jul 2021
Accepted: 14 Sep 2021
Journal Details
License
Format
Journal
eISSN
2543-4292
First Published
16 Apr 2016
Publication timeframe
1 time per year
Languages
English
Abstract

This paper proposes an improved space vector pulse width modulation (SVPWM) based DC link voltage balancing control of a three-phase three-level neutral point clamped (NPC) centralised inverter supplying the generated power from photo voltaic (PV) array to a three-phase utility grid. Two possible schemes have been developed based on the power conversion stage between PV array and the utility grid namely, two-stage (three-level boost converter three-phase three-level NPC inverter) and single-stage (three-phase three-level NPC inverter alone). The comparison between these two schemes has been thoroughly discussed in terms of the control strategies employed, power loss analysis and efficiency. The performance of the centralised inverter under different modes of operation has been investigated by developing the required control strategies for smooth operation. Using the proposed control strategy, the centralised inverter can be operated as a static synchronous compensator (STATCOM) during night time, if needed. The power loss incurred in the power-electronic converters has been analysed for constant and also for variable ambient temperature. The effectiveness of the centralised inverter as an active filter (AF) has also been verified when a three-phase non-linear load is considered in the system.

Keywords

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