Manuel Castro - Academia.edu (original) (raw)
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Papers by Manuel Castro
IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society, 2013
ABSTRACT This article presents a study on the application of distributed fault-tolerant real-time... more ABSTRACT This article presents a study on the application of distributed fault-tolerant real-time control for the parallel operation of single-phase inverters integrated in modular uninterruptible power supplies (UPS) or Battery Energy Storage Systems (BESS). The inverter controllers run the fundamental control tasks in synchronization with each other to create a replica determinate set. Control of the parallel inverters follows an active load sharing scheme supported over a digital real-time fault-tolerant control layer. Each inverter applies a Smith predictor for delay compensation and a Kalman observer to estimate output current. Thus the set of parallel inverters behaves as an AC source with low output impedance, whereas the output current is shared equally between the inverters, avoiding circulating currents. Variants and extensions of the method are also proposed. The paper concludes by discussing grounds for standardizing a distributed real-time control layer for modular converter systems.
Electric Power Systems Research, 2014
The first part of this work introduced a control architecture for a low-voltage AC microgrid with... more The first part of this work introduced a control architecture for a low-voltage AC microgrid with distributed battery energy storage working in isolated mode. A primary control layer, based on applying decoupled droop control methods to the inverters, was proposed and analyzed, demonstrating its capability to share power and keep frequency and voltage within prescribed ranges under load changes. This second part of the work extends the analysis of the primary control actuation and proposes a secondary control layer, supported over a communications network, to add improvements such as local reactive power dispatching and nominal frequency and voltage restoration.
IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society, 2013
ABSTRACT This article presents a study on the application of distributed fault-tolerant real-time... more ABSTRACT This article presents a study on the application of distributed fault-tolerant real-time control for the parallel operation of single-phase inverters integrated in modular uninterruptible power supplies (UPS) or Battery Energy Storage Systems (BESS). The inverter controllers run the fundamental control tasks in synchronization with each other to create a replica determinate set. Control of the parallel inverters follows an active load sharing scheme supported over a digital real-time fault-tolerant control layer. Each inverter applies a Smith predictor for delay compensation and a Kalman observer to estimate output current. Thus the set of parallel inverters behaves as an AC source with low output impedance, whereas the output current is shared equally between the inverters, avoiding circulating currents. Variants and extensions of the method are also proposed. The paper concludes by discussing grounds for standardizing a distributed real-time control layer for modular converter systems.
Electric Power Systems Research, 2014
The first part of this work introduced a control architecture for a low-voltage AC microgrid with... more The first part of this work introduced a control architecture for a low-voltage AC microgrid with distributed battery energy storage working in isolated mode. A primary control layer, based on applying decoupled droop control methods to the inverters, was proposed and analyzed, demonstrating its capability to share power and keep frequency and voltage within prescribed ranges under load changes. This second part of the work extends the analysis of the primary control actuation and proposes a secondary control layer, supported over a communications network, to add improvements such as local reactive power dispatching and nominal frequency and voltage restoration.