This paper presents a new predictive control algorithm for grid-connected current-controlled inverters. The control combines a two-sample deadbeat control law with a Luenberger observer to estimate the future value of the grid currents. The resulting control offers robustness against the computational delay inherent in the digital implementation and considerably enhances the gain and phase margins of the previous predictive controls while maintaining the high-speed response typical of the deadbeat controllers.

This paper presents an adaptive robust predictive current control (RPCC) for grid-connected three-phase inverters that exhibit zero steady-state current error. The error correction is achieved by means of an adaptive strategy that works in parallel with the deadbeat algorithm, therefore preserving the typical fast response of the predictive law. The resulting control adapts to any particular L or LCL filter by estimation of the resistive part of the filter. As a variety of the RPCC class of control, it offers the best tradeoff between robustness and speed.

This paper presents a new predictive current control for three-phase grid-connected inverters in the synchronous reference frame. The control combines a deadbeat control law with a diagonal Luenberger observer to estimate the future value of the grid currents. It provides a decoupled control of the active and reactive power and offers robustness against the computational delay inherent in the digital implementation and against filter and grid-impedance uncertainties. This control exhibits a very fast current response while widely improving the gain and phase margins of the traditional predictive controllers.

The main objective of this study was to test a structural theoretical model of the effects of self-regulated learning on academic stress, subjective well-being, and academic achievement in Secondary Education, considering academic procrastination as a mediator. An additional aim was to explore whether these relationships were moderated by gender and educational level. Participants were 728 students in compulsory and post-compulsory secondary education in a large city in Eastern Spain. Path analysis results indicated that the proposed model showed satisfactory fit, with the three dimensions of self-regulated learning significantly predicting the educational outcomes considered, and that procrastination mediated these relationships. Overall, the model is able to predict 9.8% of the variance of academic stress, 23.1% of students wellbeing, and 14% of academic achievement. Moreover, the multi-group routine revealed no moderation effects due to gender, but educational level moderated two relationships, between self-efficacy and academic achievement and between metacognitive strategies and procrastination. Additionally, supplementary models were tested for three specific subjects (Spanish Language, Foreign Language and Mathematics), which showed an improvement in explained variance, being respectively: 29%, 28% and 27%. Results are discussed in light of previous research and in terms of their impact on educational practice.

A bidirectional-power-flow three-phase rectifier with high-frequency isolation and all-digital control, based on the matrix converter topology, is analyzed in this paper. The selected topology consists of a bidirectional three-phase-to-single-phase reduced matrix converter with power-factor correction and a bidirectional active rectifier. The inclusion of the isolation transformer at the switching frequency permits the reduction of volume and weight. By synchronizing the commutation of both converters and adding a saturable inductor and a blocking capacitor it is possible to achieve soft commutation for most of the semiconductor elements. An all-digital control based on a digital-signal-processor and a field-programmable gate array was used to implement space-vector modulation and output current regulation. This power converter is intended to feed the low-energy correction magnet of a particle accelerator. Experimental results of a 1.5-kW 20-kHz prototype are presented to illustrate the performance of the proposed topology.