Novel Unified Control Strategies for Seamless Transfer of Operation of Three-Phase PV-Inverter from Grid-tied to Islanded Mode

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Paper number

0113

Working Group Number

Conference name

CIRED 2018 Ljubljana Workshop

Conference date

7 - 8 June 2018

Conference location

Ljubljana, Slovenia

Peer-reviewed

Yes

Short title

Convener

Authors

Kannan, Shrinath, Indian Institute of Technology - Madras, India
Gnanasekar, Rohit Kumar, HTW Berlin school of Applied sciences, Germany
Vasudevan, Krishna, Indian Institute of Technology - Madras, India

Abstract

In this paper, an adaptive unified control topology for seamless transfer of operation of a three-phase inverter in distributed generation systems from grid-tied to islanding mode of operation is proposed. The inverter is controlled in the synchronous reference frame and is connected to the Point of Common Coupling through an LCL filter. It is assumed that a signal indicating islanding is available. Continued operation in the island requires a method of maintaining the output voltage that avoids phase jumps and dramatic system transients. At the same time, power requirement for the load has to be met which may be varying with time. Two methods to achieve this operation are proposed which differ in the manner in which the angle of the voltage phasor generated by the inverter is arrived at. In one approach, the phase angle (𝜃) is self-determined, while in the other the phase angle transitions to an independent reference. In both approaches however, the system frequency is maintained constant at 50 Hz upon islanding. The performance of the proposed strategy in seamless transfer of operation and continuous operation of three-phase inverter in islanded mode supplying linear loads is validated through simulation and hardware.

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Keywords

Publisher

AIM

Date

2018-06-07

Permanent link to this record

https://www.cired-repository.org/handle/20.500.12455/1199
http://dx.doi.org/10.34890/308

ISSN

2032-9628

ISBN

978-2-9602415-1-8