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A decentralised approach is proposed in this paper for an optimal tracking control (OTC) of a hydrostatic transmission, which is commonly used in working machines. An unknown leakage volume flow and a resulting load torque have been taken into account as lumped disturbances. Together with unmeasurable system states, the normalised swashplate and the normalised bent axis angles, the proposed controller...
Paper presents an integrated kinematics and dynamic modeling of the swing, hoist and crowd movements of an electric mining shovel driven by regenerative vector controlled ac drives through ropes and gear reducers. The shovel is modeled as a 4-dof articulated mechanical system with three rotating joints and one prismatic joint. Using the developed models a typical truck loading cycle of digging, swinging,...
In this paper, two modulation strategies for a three level neutral point clamped inverter SynRM drive are compared. The inverter uses two different algorithms called Mod-1 and Mod-2 for balancing the two dc bus capacitor voltages (suppression of the neutral point voltage). These modulation strategies are of the nearest three vector (NTV) family. Mod-1 chooses certain vector states to suppress the...
This paper presents a new 3-level direct self-control (DSC) scheme for induction motor drive by selecting proper voltage vector for different speed operational. In conventional DTC two different voltage vectors are assigned to vary flux for low speed, medium speed and high speed motor operational. This paper proposed a scheme where only a single voltage vector is applied during low speed, medium speed...
In this paper, the advantage of using open-end inverter topology which can provide greater number of vector selection in minimizing the output torque ripple of Direct Torque Control (DTC) of 5-phase induction machine was proposed. By employing Dual Inverter Fed Open-End winding topology, it provides 132 effective voltage vectors where each vector may give different effect on controlling performance...
The performance of our SDRE-based controller in the face of various extended uncertainties and disturbances was shown in our previous work to be highly successful. In our previous investigation we have taken the material of the workpiece to be of one phase (austenite) and of medium and low carbon equivalents. However, it is recognized that a disturbance such as a greater decrease in temperature while...
This paper presents about the control switching strategies of switching frequency by using the multilevel inverter. In previous topology inverter, 2-level inverter is commonly implemented by using direct torque control technique. However, this inverter has some major problem issues which occur due to the limitation of capability the semiconductor device. Basically, there exist two problems; Firstly,...
Methods for attitude & orbit control of the information satellites with economical expending of the energy and fuel onboard resources are presented. We consider the land-survey mini-satellites with an orbit altitude from 600 up to 800 km when their lifetime must be up to 10 years and economical control is actual problem.
The interest of Direct Torque Control (DTC) methods in conventional three-phase induction motor drives has been stated by the scientific community and the industry in the very recent decades. Multiphase electric drives have also been recently proposed for applications where the highest overall system reliability and power distribution per phase are required, being transportation systems one of these...
In this paper, a direct torque hysteresis controller (DTHC) driving a permanent magnet synchronous machine is discussed. A two-level, three-phase conventional inverter is used as means of power conversion. Advantages such as a low switching frequency as well as further opportunities of the DTHC are specified. The simulation results show a high degree of potential for the DTHC in future applications.
Electric Vehicles (EVs) are increasingly used nowadays, and different powertrain solutions can be adopted. This paper describes the control system of an axial flux Permanent Magnet Synchronous Motor (PMSM) for EVs powertrain. It is described the implemented Field Oriented Control (FOC) algorithm and the Space Vector Modulation (SVM) technique. Also, the mathematical model of the PMSM is presented...
This paper presents a novel DC-link voltage balancing algorithm for a 3-level DC/AC traction inverter drive. In this topology, two DC-link capacitor voltages and three-phase line currents are measured, to generate the control pulses for the traction inverter, based on space-vector pulse width modulation (SV-PWM) scheme. Depending on the states of the two DC-link capacitors, redundant voltage vector...
In this paper, the problem of grid integration of a kite generator system (KGS), is handled. The mechanical power generated by the kite's traction is translated into an electrical one via a permanent magnet synchronous machine. This power is then injected in the grid or used to supply an isolated load after passing a power electronics interface. Control schemes have been developed for grid connected...
Electrical airplanes (EAs) have become practical in the recent years. Considering the increase of demand on smaller aircraft and the attention to environmental issues, the demand on small EAs is expected to grow in the coming decade. However, the accident rate of small aircrafts is higher than that of larger aircrafts, so ensuring higher safety of EA is very urgent. Modeling and thrust control of...
This work proposes a new control scheme for electrical drives system, named cascaded predictive speed control (PSC). The strategy seeks to maintain the simplicity of the classic predictive control while excluding linear or other controllers. The control strategy has a cascade architecture, similar to the techniques of classical control (FOC or DTC). The outer loop controls the speed of the machine,...
Direct matrix Converter is considered as a powerful tool for AC/AC power conversion providing AC output voltage and frequency control It also has many features such as a bidirectional power flow, a compact size and a direct conversion capability In this paper, matrix converter is used to convert a five phase input voltage into three phase output voltage with controlling output current amplitude and...
The paper proposes an implementation of a motion sensorless control system in a very wide speed range — from zero speed operation, based on direct and quadrature inductance components of the stator flux linkage for the interior permanent magnet synchronous motor-IPMSM, without signal injection. The proposed observer is developed using the Lyapunov design, resulting a scheme with a full observer for...
An original analytical expression is presented in this paper to obtain optimal currents minimizing the copper losses of a multi-phase Permanent Magnet Synchronous Motor (PMSM) under fault conditions. Based on the existing solutions [i]opt1 (without zero sequence of current constraint) and [i]opt2 (with zero sequence constraint), this new expression of currents [i]opt3 is obtained by means of a geometrical...
This paper investigates a control strategy for grid-connected wind energy conversion systems with doubly-fed induction generators, that employs a novel d-q hysteresis current regulator in the inner control loops. Although the current control is implemented in a rotating reference frame synchronous to the positive sequence space vector of the grid voltage, it can be used to generate negative sequence...
A modified DC-link voltage balancing scheme for a three-level neutral point clamped inverter (NPC) with an interior permanent magnet machine (IPMSM) is presented. It uses two DC-link voltage sensors to take care of the voltage differences, and keep it to a required tolerance level. Switching control strategy is developed using a space-vector pulse width modulation (SV-PWM) scheme. Number of switching...
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