NDLI: Voltage recovery influence on three-phase grid-connected inverters under voltage sags

Content Provider	IET Digital Library
Author	Rolán, Alejandro Giménez, Pablo Yagüe, Sauro J. Bogarra, Santiago Saura, Jaume Bakkar, Mostafa
Abstract	Faults in power systems cause voltage sags, which, in turn, provoke large current peaks in grid-connected equipment. Then, a complete knowledge of the inverter behaviour is needed to meet fault ride-through capability. The aim of this study is to propose a mathematical model that describes the behaviour of the currents that a three-phase inverter with RL filter injects to a faulty grid with symmetrical and unsymmetrical voltage sags. The voltage recovery process is considered, i.e. the fault is assumed to be cleared in the successive zero-cross instants of the fault current. It gives rise to a voltage recovery in different steps (discrete voltage sag), which differs from the usual model in the literature, where the voltage recovers instantaneously (abrupt voltage sag). The analytical model shows that the fault-clearing process has a strong influence on the injected currents. Different sag durations and depths have also been considered, showing that there exist critical values for these magnitudes, which provoke the highest current peaks. The analytical study is validated through simulations in MATLABTM and through experimental results.
Starting Page	435
Ending Page	443
Page Count	9
ISSN	17518687
Volume Number	13
e-ISSN	17518695
Issue Number	Issue 3, Feb (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/13/3
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2018.5607
Journal	IET Generation, Transmission & Distribution
Publisher Date	2018-11-15
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Abrupt Voltage Sag Control of Electric Power System Different Steps Discrete Voltage Sag Fault Current Fault Ride-through Capability Fault-clearing Process Faulty Grid Grid-connected Equipment Harmonics Highest Current Peaks Injected Current Inverter Behaviour Invertors Mathematical Model Power Converter Power Generation Fault Power Grid Power Supplies to Apparatus Power Supply Quality Power System RL Filter Injects Symmetrical Voltage Sags Three-phase Grid-connected Inverter Three-phase Inverter Unsymmetrical Voltage Sags Voltage Recovers Voltage Recovery Influence Voltage Recovery Process
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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