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Motor torque control is a key feature in force centered robotic applications such as haptics, force amplification and telemanipulation with force feedback. Most of the actually applied control schemes for this type of applications are based on 3 levels cascade control: high level force/torque loop, inner velocity loop, inner current loop. The two inner loops are respectively of P and PI type. The...
The switch-mode operation of dc to ac inverters produces undesirable harmonics in the voltage and current outputs. Pulse Width Modulation (PWM) schemes based on Selective Harmonic Elimination (SHE) and carrier-based modulation are commonly used to address the harmonic reduction problem, and to provide adjustable inverter output fundamental components. The implementation of each scheme requires introduction...
This paper presents a new schematic for three phase seven-level inverters. The proposed topology minimizes switching, reduces short circuiting, is easy to control, and can mask through upper-level switches the work of lower levels. System improvements include low ripple-current, high power conversion and minimized switching, which are verified in simulations using the Matlab/Simulink software package...
This paper proposes a low switching frequency predictive control scheme for the induction machine, employing a 3L-NPC. The mismatch between sampled and average current is modeled and compensated. The control strategy is implemented as an explicit model predictive controller with PWM, considering a sampling time of 1[ms], which results in a 500[Hz] switching frequency. The results show that the controller...
This paper studies the performance of the switching frequency signal injection (SFSI) algorithm to estimate the rotor position in permanent magnets synchronous machines (PMSM) intended for electric vehicle (EV) propulsion. A simple and effective demodulation algorithm is proposed to carry out this estimation by using only current measurements. As opposed to recent literature on the subject, the proposed...
This paper proposes a new rotor position estimating method by detecting the stator currents under each PWM switching state for an interior permanent magnet synchronous motor drive system. The proposed sensorless drive system can be applied in an air conditioner without injecting any high-frequency sinusoidal or cosine voltage signal. The operating speed range can be effectively extended because the...
This paper presents the vector control design of an axial-flux permanent magnet motor (AFPM) driven by a current source inverter (CSI), which is considered as having many advantages over the voltage source inverter. The control system consists of a 2-DOF speed controller, a multi-loop current controller, and an SVPWM modulation block, which can offer a faster dynamic response, an instantaneous adjustment...
This paper focuses on state estimation of DC-DC converters in the presences of a biased duty-cycle which is very common in practice. It is shown that the commonly used Proportional (P-) observer fails to estimate the state of the converter when an unknown biased duty-cycle is present. To address this issue, a Proportional-Integral (PI-) observer is proposed, and its design is formulated as a H∞/L2...
Field Oriented Control (FOC) technique is one of the mostly applied algorithm to control the speed and the flux of a three-phase electric drive. The paper focuses on high speed or high-pole count motor FOC drives when both the sampling over reference frequency ratio F and the carrier over reference frequency mf is low. The paper presents that the stability range of a speed sensor-less FOC motor drive...
This paper proposes an all-digital general pulse-xwidth modulator (ADGPWM) that is an improvement of the general pulse-width modulator (GPWM). The ADGPWM allows overmodulation and negative carrier and reference signals to be managed. The proposed all-digital implementation is suited both to serial/concurrent data processing platforms and to integrated circuit implementation, to realize several control...
Multiple Output Converters (MOCs) are widely used in electronic equipment for industrial, commercial, and military application such as the voltage regulator modules in portable electronic devices, multiple output power supplies, and multiple output charger due to their advantages in cost, volume, and efficiency. However, most of the MOCs developed so far have limitations in terms of the number of...
This paper presents the application of carrier phase-shifted PWM technology in the position detection for permanent magnet synchronous motor at standstill position. At the same time, it gives the polarity identification in the rotary frame with detected position from the neutral voltage. The new technique describes the method of carrier phase-shifted PWM technology with neutral voltage. It can detect...
This paper presents a novel seven-phase open-end winding drive system supplied by the dual non-square matrix converter. The input to each of the matrix converter is three phase utility grid system and the output is seven phase voltages with variable voltage and frequency. The two matrix converters feeding the seven-phase open-end load are supplied from a common single three-phase utility source of...
Multilevel inverters generate low harmonic waveforms at the output, which makes them suitable for high voltage energy conversion scheme to deliver efficient high power to the loads from renewable energy sources like photovoltaic systems which are penetrating to the electric grid nowadays, significantly. In this paper a single-phase hybrid multilevel inverter based on cascading full bridge and half...
Distributed generation (DG) interfaced to the grid through power electronic (PE) interface can be used to provide reactive power for voltage stability in a power system they are part of. Furthermore, they can be used to minimize the harmonic issues caused by the PE non-linear loads present at the distribution level. This article investigates the possibility of using a generation side PE interface...
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