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Energy Balancing Improvement of Modular Multilevel Converters under Unbalanced Grid Conditions
(Institute of Electrical and Electronics Engineers, 2017-08)
This paper presents a feedback/feed-forward control strategy to improve the voltage balancing of modular multilevel converters (MMCs) under unbalanced grid conditions. The inclusion of a feed-forward compensation improves ...
Improved Energy Conversion Process With Coupling Induction Motors And Invastigate Unbalanced Operation With Definition Of The Voltage Unbalance
(Universidade Federal de Santa Maria, 2015)
Single-phase consensus-based control for regulating voltage and sharing unbalanced currents in 3-wire isolated AC microgrids
(Institute of Electrical and Electronics Engineers (IEEE), 2020)
A distributed control strategy is proposed to share unbalanced currents in three-phase three-wire isolated AC Microgrids (MGs). It is based on a novel approach where, rather than analysing the MG as a three-phase system, ...
Evaluation of Volts/Hertz and over-excitation limiters acting under unbalanced load conditions.
(IEEEPiscataway, 2013)
Currently, a worldwide tendency of decentralization
of electric energy production (called Distributed Generation) is
observed, where small generators – sometimes composed by
synchronous machines – are connected mainly ...
Active and reactive power control during unbalanced grid voltage in pv systems
(2016)
This paper presents a control strategy for a grid connected photovoltaic (PV) system aiming to regulate the active and reactive power injected to the electric system during asymmetrical voltage faults. The active power ...
An overview of four-leg converters: topologies, modulations, control and applications
(IEEE, 2022)
In three-phase unbalanced systems, where the circulation of zero sequence current is necessary, four-leg converters provide a neutral connection for single-phase or other unbalanced loads typically utilized in three-phase ...
Observer-Based Grid-Voltage Sensorless Synchronization and Control of a VSI-LCL Tied to an Unbalanced Grid
(Institute of Electrical and Electronics Engineers, 2019-07)
This paper proposes an observer-based grid-voltage sensorless strategy that allows to implement the synchronization and control of an LCL grid-tied voltage source inverter. By using exclusively the measurement of the current ...
Análise e controle de aerogeradores com conversor pleno durante afundamentos de tensão
(Universidade Federal de Santa MariaBREngenharia ElétricaUFSMPrograma de Pós-Graduação em Engenharia Elétrica, 2012-09-28)
This thesis addresses the main issues regarding the operation of full power converters
wind turbines connected to the grid under balanced and unbalanced voltage sags.
In the past, the grid codes allowed wind turbines to ...
Software Sensor-Based STATCOM Control under Unbalanced Conditions
(Institute of Electrical and Electronics Engineers, 2009-07-24)
A new control strategy for static compensators (STATCOMs) operating under unbalanced voltages and currents is presented in this paper. The proposed strategy adopts a state observer (software sensor) to estimate ac voltages ...