Journal ArticleDOI
An Adaptive Control for UPS to Compensate Unbalance and Harmonic Distortion Using a Combined Capacitor/Load Current Sensing
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TLDR
This paper investigates the control of an uninterruptible power supply (UPS) using a combined measurement of capacitor and load currents in the same current sensor arrangement, and proposes a voltage controller based on resonant harmonic filters in order to compensate for unbalance and harmonic distortion on the load.Abstract:
This paper investigates the control of an uninterruptible power supply (UPS) using a combined measurement of capacitor and load currents in the same current sensor arrangement. The purpose of this combined measurement is, on one hand, to reach a similar performance as that obtained in the inductor current controller with load current feedforward and, on the other hand, to easily obtain an estimate of the inductor current for overcurrent protection capability. Based on this combined current measurement, a voltage controller based on resonant harmonic filters is investigated in order to compensate for unbalance and harmonic distortion on the load. Adaptation is included to cope with uncertainties in the system parameters. It is shown that after transformations the proposed controller gets a simple and practical form that includes a bank of resonant filters, which is in agreement with the internal model principle and corresponds to similar approaches proposed recently. The controller is based on a frequency-domain description of the periodic disturbances, which include both symmetric components, namely, the negative and positive sequence. Experimental results on the output stage of a three-phase three-wire UPS are presented to assess the performance of the proposed algorithmread more
Citations
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Journal ArticleDOI
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Journal ArticleDOI
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Journal ArticleDOI
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Patricio Cortes,Gonzalo Costales Ortiz,Juan I. Yuz,Jose Rodriguez,Sergio Vazquez,Leopoldo G. Franquelo +5 more
TL;DR: A new and simple control scheme using predictive control for a two-level converter using a model of the system to predict the behavior of the output voltage for each possible switching state is presented.
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Journal ArticleDOI
Design and Implementation of a Robust Current Controller for VSI Connected to the Grid Through an LCL Filter
TL;DR: In this paper, the authors describe the design and implementation of a discrete controller for grid-connected voltage-source inverters with an LCL filter usually found in wind power generation systems.
References
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Journal ArticleDOI
Stationary frame current regulation of PWM inverters with zero steady-state error
D.N. Zmood,Donald Grahame Holmes +1 more
TL;DR: In this article, the P+Resonant regulator is proposed, which achieves the same transient and steady-state performance as a synchronous frame PI regulator and is applicable to both single-phase and three-phase inverters.
Proceedings ArticleDOI
Stationary frame current regulation of PWM inverters with zero steady state error
D.N. Zmood,Donald Grahame Holmes +1 more
TL;DR: In this paper, a new type of stationary frame controller is proposed, which achieves the same steady state performance as a synchronous frame controller, and is applicable to both single phase and three phase inverters.
Journal ArticleDOI
Control topology options for single-phase UPS inverters
TL;DR: In this paper, four control topologies for single-phase uninterruptible power system (UPS) inverters are presented and compared, with the common objective of providing a dynamically stiff, low total harmonic distortion (THD), sinusoidal output voltage.
Journal ArticleDOI
Synchronous-frame harmonic control for high-performance AC power supplies
TL;DR: In this paper, a synchronous-frame controller for each selected frequency in addition to a conventional control is proposed to regulate the fundamental output voltage, as well as that of some low-order harmonics.
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