# Carlos OrtegaEscola Universitària Salesiana de Sarrià | EUSS · Electronics

Carlos Ortega

PhD

## About

28

Publications

2,695

Reads

**How we measure 'reads'**

A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more

473

Citations

Citations since 2017

Introduction

Additional affiliations

January 2006 - December 2010

**Escola Universitària Salesiana de Sarrià**

## Publications

Publications (28)

This paper presents the study of an alternative space vector modulation (SVM) implementation for matrix converters (MCs), which reduces the output common mode (CM) voltage. The strategy is based on replacing the MC zero vectors with rotating ones. In doing this, the CM voltage (CMV) can be reduced, which, in turn, reduces the CM leakage current. By...

A predictive Direct Torque Control method for Matrix Converters fed Permanent Magnet Synchronous Machines drives is proposed in this paper. The voltage vector from the Matrix Converter which ensures minimum torque ripple is selected based on a predictive algorithm. A look-up table for Direct Torque Control using Matrix Converters has been developed...

Permanent Magnet Synchronous Machines (PMSMs) have several advantages, such as high efficiency and low volume and weight, which make them attractive for aerospace applications and high performance servo drives.Matrix Converters (MCs) are an all-silicon alternative, with no bulky reactive elements, to the standard voltage source inverter.The most co...

This paper is focused on the validation of a previously presented method to obtain conducted EMI in direct matrix converters (MC). Such model is based on a frequency domain equivalent circuit, which is applied to two different prototypes of MC in order to validate such method. This paper starts with a review of the EMI method and follows obtaining...

This paper presents an electromagnetic interference (EMI) model to evaluate the conducted common mode (CM) disturbances produced by matrix converters (MCs). The model is based on obtaining a high frequency (HF) equivalent circuit with HF sources representing the switching devices. The circuit resolution in the frequency domain allows the calculatio...

This paper deals with the validation of an EMI model to predict electromagnetic interferences (EMI) produced by direct AC/AC matrix converters (MC). The method is based on obtaining a high frequency equivalent circuit, using a combined time and frequency domain approach based on: "EMI source identification→ propagation path impedance→ derived distu...

This paper presents a new model for simulation of Electromagnetic Interference (EMI) in power converters. Despite the fact that a Matrix Converter (MC) has been selected, such methodology can be applied to other converter topologies. The EMI model relies on a combination of time and frequency domain techniques in order to not only reduce the comput...

This paper deals with the validation of an EMI model to predict electromagnetic interferences (EMI) produced by power converters. A direct AC to AC matrix converter (MC) has been selected as experimental setup for the paper, but the modeling method can be applied to other converter topologies. The method is based on obtaining a high frequency equiv...

The work presented in this paper proposes an approach to reduce the common mode voltage at the output of matrix converters when a direct torque control scheme is employed to drive a permanent magnet synchronous motor. A mathematical analysis of the common mode voltage at the output of matrix converters is ﬁrstly carried out which is then corroborat...

Despite the ability of matrix converters (MCs) to generate a higher number of voltage vectors compared with standard voltage-source inverters, most of the applications reported in the literature utilize only those having larger amplitudes. This paper investigates the use of MC input voltages with different amplitudes in order to reduce the inherent...

An alternative Space Vector Modulation (SVM) strategy which reduces the Common Mode (CM) perturbations when using Matrix Converters (MC) is presented in this work. The proposed method maintains the conventional SVM pattern but the zero vectors, which have been shown to introduce not only high CM voltage values but also high CM voltage time derivati...

In this paper, a direct torque control method for matrix converters fed induction motors is proposed. A predictive algorithm which ensures minimum torque ripple is employed for the selection of the appropriate voltage vector from the matrix converter. A new look-up table for direct torque control using matrix converters has been developed which del...

This paper presents an alternative space vector modulation (SVM) implemented in matrix converters (MC) which improves and reduces the common mode (CM) voltage and current output waveforms. The strategy is based on replacing the MC zero vectors for the rotating ones, which reduces the CM voltage derivative and therefore the leakage CM current. By re...

The work presented in this paper addresses the unwanted windup phenomenon reviewing and comparing different PI anti-windup strategies employed in speed control of electric drives. The tuning process of PI controllers is usually carried out considering the system as linear and therefore disregarding its physical limits such as maximum current and vo...

When facing real systems PI tuning, the plant is modeled disregarding its physical limitations. Consequently, the PI output may increase indefinitely its value; phenomenon called Windup. This paper presents a review and a comparison between different Anti-Windup PI strategies used in speed motion and position control for Matrix Converter PMSM servo...

This paper investigates the use of a Current Regulator to control Matrix Converters in Field Oriented Control of Permanent Magnet Synchronous Machines Drives. Most of the Field Oriented Control Schemes are used with the standard Voltage Source Inverters and a feed forward Space Vector Modulator. This paper, however, addresses the use of a four quad...

This paper deals with the rotor angle estimation for further sensorless field oriented control of permanent magnet synchronous machines using voltage matrix converters test vectors. The Angle estimation is based on the machine saliency (difference between Ld and Lq), which is properly tracked by the application of pulse voltage test vectors. For al...

The paper analyzes the common mode voltage at the output of matrix converters. Based on the theoretical analysis, an approach to reduce the common mode voltage for direct torque control drives using matrix converter is then proposed. The proposed method can be easily implemented without increasing computational requirements and it has been shown to...

This paper deals with the sensorless field oriented control of permanent magnet synchronous machines using test matrix converters voltage vectors. The novelty of this paper is the fact that a matrix converter is used instead of the conventional voltage source inverter and that the uncommon shorter matrix converter vectors are used as a test signals...

The common mode voltage at the output of matrix converters is firstly analyzed in this paper. An approach to reduced it, when a direct torque control scheme is employed to drive a permanent magnet synchronous motor, is then proposed. Simulation results are shown to demonstrate the theoretical background. Experimental results corroborating the effec...

This paper deals with the rotor angle estimation for further Sensorless Field Oriented Control of Permanent Magnet Synchronous Machines using voltage Matrix Converters test vectors. The angle estimation is based on the machine saliency (difference between Ld and Lq), which is properly tracked by the application of pulse voltage test vectors. For al...

The paper investigates the use of the small voltage vectors of matrix converters (MC) in order to reduce the inherent torque ripple that appears when direct torque control (DTC) is used to control permanent magnets synchronous motors (PMSM). The new approach will differentiate between small and large torque errors, thus reducing the electromagnetic...

A sensorless Direct Torque Control (DTC) of a Permanent Magnet Synchronous Motor (PMSM) drive using a high frequency hf hf voltage injection technique without compromising the simplicity of the original DTC algorithm, is proposed in this paper. A new hf hf injection algorithm, in which the hf hf carrier is introduced by the direct modification of t...

The effects on torque performance when using small voltage vectors of Matrix Converters is investigated in this paper. These vectors are used in order to reduce the electromagnetic torque ripple which appears when Direct Torque Control technique is used in Induction Motors. Direct Torque Control for Induction Motors using Matrix Converters is revie...

This paper proposes the high frequency (hf) voltage injection technique to DTC drives with the objective of extending their performance to the low and zero speed region. The simplicity of the original DTC algorithm is not compromised. The hf carrier is introduced by the direct modification of the fundamental voltage vectors. The position signal is...

This paper investigates the use of short voltage vectors of matrix converters to reduce the electromagnetic torque ripple which appears when direct torque control technique is used in induction motors. Direct torque control for induction motors using matrix converters is reviewed and it is pointed out the problem of the electromagnetic torque rippl...

A new digital current controller with active-null state modulation for voltage source inverter systems (VSI) is presented. The major advantages of the proposed current controller system are: minimisation of the total harmonic distortion (THD) of the output current waveform and maximisation of the time of application of the voltage vectors