Self-commissioning algorithm for matrix converter, nonlinearity compensation

Abstract

Matrix converter nonlinear errors due to voltage drop and commutation delay introduce a distortion between voltage reference signals and output phase voltages. In current controlled applications, the current regulators are capable of compensating for such voltage command error. However, where output voltage estimation is required such as in state observers used for sensorless control of ac drives, the converter error reduces the accuracy of the voltage estimate, especially at low speeds. This work proposes a simple and accurate technique for the identification of converter parameters before the drive startup. Based on the identified parameters, the nonlinearities are compensated. The feasibility and effectiveness of the presented method is shown in simulation. Experimental results are also reported.

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

“…The schematic diagram of a three-phase to three-phase matrix converter is illustrated in Fig.1, where each bidirectional switch can connect one of the input phases to one of the output phases. Indirect space vector modulation (ISVM) is adopted in this paper [21]. The aim of ISVM is to synthesize the output voltage vectors and the phase angle of input current vectors at the same time.…”

“…The equation 5can be extended for all input sectors and output phase currents as (6), where j and i denote for input and output phases,respectively [16], [21]. As seen, the EU voltage is dependent on the magnitude of input voltage and the sign of output phase current.…”

“…However, to compensate the effect of parasitic capacitors along with commutation and ON-state voltage errors, accurate knowledge of power devise is required. A self-commissioning technique was proposed in [21] capable of identifying MC voltage error before drive startup and not requiring IGBT datasheet. Then, a compensation technique was proposed in stationary αβ frame to omit nonlinear voltage errors.…”

A Current Control Approach for an Abnormal Grid Supplied Ultra Sparse Z-Source Matrix Converter with a Particle Swarm Optimization Proportional-Integral Induction Motor Drive Controller

“…The MC family is still categorized as a laboratory AC/DC driver with little reliable potential for industrial use [6,7] because of the control complexity [8], sensitivity in the face of abnormal input [9], limitation of the voltage transfer ratio up to 86.6% [10], and excess semiconductor switches [11]. These are the most critical obstacles to overcome, and, hence, solutions would be welcomed by manufacturers and industrial developers.…”

“…These are the most critical obstacles to overcome, and, hence, solutions would be welcomed by manufacturers and industrial developers. Furthermore, a direct matrix converter has a flow power path in the bidirectional mode for transmitting the power [10], either from the grid to the load…”