Oscillator-Based Inverter Control for Islanded Three-Phase Microgrids

Author

Johnson, Brian B. ; Dhople, Sairaj V. ; Cale, James L. ; Hamadeh, Abdullah O. ; Krein, Philip T.

Author_Institution

Distrib. Energy Syst. Integration group, Nat. Renewable Energy Lab., Golden, CO, USA

Volume

4

Issue

1

fYear

2014

fDate

Jan. 2014

Firstpage

387

Lastpage

395

Abstract

A control scheme is proposed for an islanded low-inertia three-phase inverter-based microgrid with a high penetration of photovoltaic (PV) generation resources. The output of each inverter is programmed to emulate the dynamics of a nonlinear oscillator. The virtual oscillators within each controller are implicitly coupled through the physical electrical network. The asymptotic synchronization of the oscillators can be guaranteed by design, and as a result, a stable power system emerges innately with no communication between the inverters. Time-domain switching-level simulation results for a 45-kW microgrid with 33% PV penetration demonstrate the merits of the proposed technique; in particular they show that the load voltage can be maintained between prescribed bounds in spite of variations in incident irradiance and step changes in the load.

Keywords

distributed power generation; invertors; oscillators; power generation control; synchronisation; control scheme; incident irradiance; inverter output; islanded low-inertia three-phase inverter-based microgrid; load voltage; nonlinear oscillator dynamics; oscillator asymptotic synchronization; oscillator-based inverter control; photovoltaic generation resource penetration; physical electrical network; power 45 kW; stable power system; step changes; time-domain switching-level simulation; virtual oscillators; Inverters; Maximum power point trackers; Microgrids; Oscillators; Steady-state; Synchronization; Voltage control; Microgrids; oscillators; photovoltaic inverter control; synchronization;

fLanguage

English

Journal_Title

Photovoltaics, IEEE Journal of

Publisher

ieee

ISSN

2156-3381

Type

jour

DOI

10.1109/JPHOTOV.2013.2280953

Filename

6620994