An Accurate Self-Commissioning Technique for Matrix Converters Applied to Sensorless Control of Synchronous Reluctance Motor Drives

Abstract

The compensation of converters' nonlinear voltage error is crucial in encoder-less control of ac motor drives. In this paper, a new self-commissioning and compensation method is proposed for matrix converters (MC). Similar to what done in the past for voltage source inverters, the MC voltage error is identified before the drive start and stored in a look-up table (LUT), later used for error compensation and accurate voltage estimate. Different from what observed in the past, the effect of parasitic capacitors on nonlinear voltage error of MCs in four-step current based commutation is observed and studied. Eventually, this method is applied to the sensorless control of a synchronous reluctance (SyR) motor drive, using the direct flux vector control (DFVC) concept. Experimental results are presented to validate the effectiveness of proposed self-commissioning in improving the performance of sensorless control at standstill and low speed.

Torque calculation of five-phase synchronous reluctance motors with shifted-asymmetrical-salient-poles under saturation condition

“…For the sake of reducing the torque ripple of SynRMs, many methods have been presented. Some papers focus on optimized control [3], [4], while the majorities are absorbed in the design of parameters of SynRMs or the structure of SynRMs [5], [6]. On the basis of multi-objective genetic optimization and finite elements method (FEM), the optimal design of SynRMs was proposed in [6].…”

Direct Power Control of Matrix Converter-Fed DFIG with Fixed Switching Frequency

“…Due to their lack of bulky electrolytic dc-link capacitors, matrix converters are attractive alternatives for the applications where low volume and high reliability are important. Due to these advantages, the application of MCs are extended from electrical drives to grid-connected renewable resources [14][15][16][17]. In [14] a comprehensive review has been done for matrix converter technology including different modulation schemes and commutation methods.…”

“…A self-commissioning technique was proposed in [16] capable of identifying the matrix converter nonlinear voltage errors. In [17], the application of matrix converters in sensorless control of synchronous reluctance motor drives was investigated and the effect of nonlinear voltage errors on the control was analyzed. Also, the application of matrix converters in wind turbine based generators have attracted researchers' attention in recent years [18][19][20][21].…”

Self‐regulated DC‐link control of synchronous reluctance motor‐driven solar water pumping system

“…In the last few years, sensorless speed control algorithms have drawn the researcher's attention in both industry and academia [14][15][16][17][18][19][20][21][22]. A simple and robust rotor estimation technique is proposed in [14], in which the position estimation is based only on the rate of change of stator currents and there is no effect of other parameters.…”

“…In this technique, the problem of position drift because of rotor oscillation is solved. An exact self-commissioning method for position estimation is reported in [20]. Here, the converter voltage error compensation is utilised for accurate estimation.…”