Preselection algorithm based on predictive control for direct matrix converter

Abstract

This paper presents an enhanced predictive control strategy to reduce the calculation effort for direct matrix converters.The main idea is to preselect the switching states to decrease the calculation effort during each sample period. The proposed preselection algorithm enables a predefined cost function to consider only the preselected switching states to perform the expected control. On the basis of the preselection of switching states at each sample period, the proposed method can effectively reduce the calculation effort as well as show a good performance. The proposed predictive control scheme using only preselected switching states needed to generate the desired source/load current waveforms and control the input power factor. The feasibility of the proposed method is experimentally verified and results are presented in the paper.

Original Approach Toward Three-Phase Indirect Matrix Converters Through Hybrid PWM Modulation and DSP Implementation

“…The converter is connected to the grid through an LC filter and supplies a three-phase star-connected The last block computes first the reference output voltages (U AN , U BN , U BN ) , from the target references U * α and U * β which are usually generated by an outer loop. Then, it computes the modulating signals U * A , U * B , and U * C according to (18) and the duty ratios d A , d B , and d C as reported in (19). Finally, the opportune values of CMPA and CMPB registers of each epwm module are determined as explained above in section IV-A.…”

“…Fig. 14 displays the waveform of a modulation signal computed according to (18) where the voltage transfer ratio is set to:…”

“…1, the main electrical power is delivered from the grid, which is considered the input to the topologic rectifier. Assign letters (a, b, c) to the three-phase input source where grid voltages are sinusoidal, symmetrical, and balanced denoted by (U a , U b , U c ) and specified in Equation (1) [16]- [18]:…”

Hybrid predictive control strategy for a low‐cost converter‐fed IM drive

“…As well known, the traditional model predictive control (MPC) has the advantage of handling constraints [17]. However, the general MPC is not much suitable for power electronic circuits which demands high performance of real time [18]. Recently, a finite set MPC (FS-MPC) scheme has been proposed for power converters [18][19][20].…”

“…However, the general MPC is not much suitable for power electronic circuits which demands high performance of real time [18]. Recently, a finite set MPC (FS-MPC) scheme has been proposed for power converters [18][19][20]. The FS-MPC algorithm, which is easy to understand and flexible to control, can fully consider the constraint conditions of system and easily deal with them.…”