1,721,007 research outputs found
Optimum control of N-input K-output matrix converters
No full textSignificant developments of the general optimum control theory presented in a previous paper by the authors (1988) are discussed for the specific case of multiphase matrix converters. Results hold, regardless of system configuration, input and output voltage waveforms, and loads. Applications to the most practical converter structures are illustrated, and implementation criteria of the optimum control method are derived. Simulated results confirm the flexibility and effectiveness of the approach
Active power filter with hybrid energy storage
No full textAn active power filter that uses an impressed current converter and an inductive-capacitive energy storage circuit is presented. This storage includes a switching section to interface the inductive and capacitive element. This solution allows independent choice of the converter configuration and of the type of storage system which, in this particular case, is mainly capacitive. The theory of operation is analyzed, together with control strategy and design criteria. Experimental results are reporte
Optimum control of PWM multiconverter systems
No full textA general representation of multi-input-multi-output voltage-fed PWM (pulsewidth-modulated) converter systems is presented. This representation is used to solve the optimum control problem in analytical, closed form. The synthesis procedure and implementation criteria of a general-purpose optimum controller are then discussed. An application example showing the flexibility of the proposed approach is reported, and simulated results are given
High-performance hysteresis modulation technique for active filtersProceedings of Applied Power Electronics Conference. APEC '96
No full text
On the Applications of Active Filters to Generic Loads
No full textThe paper discusses the application of parallel active filters to the compensation of generic loads. In particular, attention is focused on the potential instability which can occur in the compensating system in the presence of a capacitive load impedance. This problem is illustrated in the case of a typical active filter implementation but the analysis is extended also to other control strategies discussed in the literature. Some of these are shown to improve the system's stability, although at the expense of an increased interaction with the utility grid. The modulation technique of the power converter implementing the active filter also plays a key role in determining the system's robustness and the quality of the compensation. The last part of the paper discusses the effectiveness of the more common current control strategies both from the stability and from the compensation quality standpoint
Comparison of Current Control Techniques for Active Filter Applications
No full textThis paper presents the comparative evaluation of the performance of three state-of-the-art current control techniques
for active filters. The linear rotating frame current controller, the fixed-frequency hysteresis controller, and the digital deadbeat controller are considered. The main control innovations, determined by industrial applications, are presented, suitable criteria for the comparison are identified, and the differences
in the performance of the three controllers in a typical parallel
active filter setup are investigated by simulations
Robust Dead-Beat Current Control for PWM Rectifiers and Active Filters
No full textThis paper analyzes the stability limitations of the digital dead-beat current control applied to voltage-source threephase
converters used as pulsewidth modulation rectifiers and/or active filters. In these applications, the conventional control algorithm,
as used in drive applications, is not sufficiently robust, and stability problems may arise for the current control loop. The current loop is, indeed, particularly sensitive to any model mismatch and to the possibly incorrect identification of the model
parameters. A detailed analysis of the stability limitations of the
commonly adopted dead-beat algorithm, based on a discretetime
state-space model of the controlled system, is presented. A modified line voltage estimation technique is proposed, which increases the control’s robustness to parameter mismatches. The
results of the theoretical analysis and the validity of the proposed
modification to the control strategy are finally verified both by
simulations and by experimental tests
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