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Resonant control is one of the highest performance alternatives for ac current/voltage control. The implementations based on two integrators are a widely employed choice in order to provide frequency adaptation to these regulators without substantial computational burden. However, the discretization of these schemes causes a significant error both in the resonant frequency and in the phase lead provided...
Harmonic detection is a very important factor in control of active power filters, since it generates the reference signal for the current controller. The performance of the whole system will be affected by the suitability of the implemented harmonic identification method. In this work, the equivalences and advantages of the discrete cosine transform with respect to other Fourier based algorithms are...
The actual lines have many operation problems like power flow distribution, oscillations, etc. A bad power flow distribution on the network lines appears for example during a fault, in this case is possible that some lines of the network would be overloaded and other lines under their thermal value. A possible solution of the problem is using series compensators to redistribute the power flow, the...
This paper presents the particularization of a recent multilevel multiphase space vector pulse-width modulation algorithm for three-phase converters. This modulation technique takes advantage of the switching state redundancy, which permits to achieve different goals like extending the modulation index range and reducing the number of switchings. The particularized algorithm is then compared with...
This paper analyzes the tuning of the phase locked loops (PLLs) employed in the control of power converters when there is distortion in the AC mains. The pros and cons of different optimization approaches are studied. In a general way, PLLs with a low bandwidth (low-gain PLLs) are required when handling with distorted. This paper proves that the tuning of low-gain PLLs have more than one trade-off...
Multilevel technology achieves high power ratings with voltage limited devices. Recently a new space vector pulse-width modulation algorithm for multilevel multiphase voltage source converters with low computational cost has been presented. This algorithm can be used with any number of phases; therefore, it can be also used with classical three-phase topologies. In this paper, the multiphase algorithm...
Four-leg voltage-source converters provide an effective neutral connection in three-phase systems with neutral wire. They can be applied to inverters, rectifiers or active filters to control the neutral current caused by unbalanced or nonlinear loads as well as unbalanced sources. From the modulation point of view, the four-leg converters can be considered as four-phase systems. Hence, the modulation...
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