NDLI: To study unplanned islanding transient response of microgrid by implementing MSOG and SRF-PLL based hierarchical control in the presence of non-linear loads

Content Provider	IET Digital Library
Author	Niazi, Ahmad Norozpour Vasegh, Nastran Birjandi, Ali Akbar Motie
Abstract	This study considers the hierarchical control of microgrid and harmonic compensation of non-linear load specially in transition from grid-connected to unplanned islanding. The proposed controllers are based on the stationary reference frame with hierarchical control levels (inner, primary, and secondary). In the inner control loop, proportional and multi-resonant voltage and current controllers for three-phase voltage source inverters are proposed. Moreover, a droop control is used to share active and reactive power in the primary control loop. To achieve decoupled active and reactive power sharing, virtual impedance loop is implemented, too. The mentioned procedure increases the total impedance and consequently reduces the initial current and subsequently facilitates the continuous connection of DGs to the MG. To attain smoother transition, selective harmonic virtual impedance is applied by multiple second-order generalised integrator module to extract the fundamental positive sequence and harmonic components of the output current of the DGs. In secondary control level, synchronisation procedure is considered to make connection and restoration by the advanced three-phase synchronous reference frame PLL with in-loop moving average filter which significantly enhances its disturbance rejection capability. The results are shown smoother transition, robustness, and high performance of the proposed hierarchical control VSIs during variation of system configuration.
Starting Page	881
Ending Page	890
Page Count	10
ISSN	17521416
Volume Number	14
e-ISSN	17521424
Issue Number	Issue 5, Apr (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rpg/14/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2019.0506
Journal	IET Renewable Power Generation
Publisher Date	2019-11-21
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Continuous Connection Control of Electric Power System Current Control Current Controller Decoupled Active Power Sharing Demodulator Discriminators And Mixers Distributed Power Generation Distribution Network Droop Control Electric Current Control Harmonic Compensation Harmonic Component Hierarchical Control Levels Hierarchical Control VSIs In-loop Moving Average Filter Inner Control Loop Invertors Modulator Nonlinear Load Phase Locked Loop Power And Energy Control Power Converter Power Distribution Fault Power Generation Control Power Grid Power Supplies to Apparatus Power System Control Primary Control Loop Procedure Increases Reactive Power Control Reactive Power Sharing Second-order Generalised Integrator Module Secondary Control Level Selective Harmonic Virtual Impedance Smoother Transition Stationary Reference Frame Study Unplanned Islanding Transient Response Synchronisation Three-phase Synchronous Reference Frame PLL Three-phase Voltage Source Inverter Total Impedance Transient Response Virtual Impedance Loop Voltage Control
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment

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