A Grid-compatible Virtual Oscillator Controller: Analysis and Design

In this paper, we present a virtual oscillator control (VOC) strategy for power inverters to operate in either grid-connected or islanded settings. The proposed controller is based on the dynamics of the nonlinear Andronov-Hopf oscillator and it provides voltage regulation, frequency support in isla...

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Bibliographic Details
Published inIEEE Energy Conversion Congress and Exposition pp. 2643 - 2649
Main Authors Lu, Minghui, Dutta, Soham, Purba, Victor, Dhople, Sairaj, Johnson, Brian
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.09.2019
Subjects
Frequency control
Harmonic analysis
Inverters
Limit-cycles
Oscillators
Power system dynamics
Voltage control
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ISSN2329-3748
DOI10.1109/ECCE.2019.8913128

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Summary:In this paper, we present a virtual oscillator control (VOC) strategy for power inverters to operate in either grid-connected or islanded settings. The proposed controller is based on the dynamics of the nonlinear Andronov-Hopf oscillator and it provides voltage regulation, frequency support in islanded mode. It also features the potential to respond to real- and reactive-power setpoints for dispatchability in grid-connected mode. In contrast to early VOC incarnations which exhibit undesirable harmonics, the proposed controller offers a sinusoidal ac limit cycle as well as improved dynamic performance. Moreover, the proposed controller intrinsically generates orthogonal signals which facilitate implementation in three-phase systems. We study the controller dynamical model and outline a systematic design procedure such that the inverter satisfies standard ac performance specifications. Numerical simulations validate the analytical developments.
ISSN:2329-3748
DOI:10.1109/ECCE.2019.8913128