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This paper discusses the performance of a single-phase induction motor drive under nominal load in a closed-loop vector-controlled system. The control strategy to be applied is known as indirect field oriented control. Single-phase induction motor when operating as two-phase motor has its dynamic performance increased. With the use of a standard three-phase voltage-source inverter, space vector pulse...
Several works have been reported in the literature on multilevel inverters topologies, control techniques and applications. However, there are few works that actually discuss or evaluate the performance of induction motor drives associated to three-phase multilevel inverter. This paper presents then a comparison study for a cascaded H-bridge multilevel DTC induction motor drive. In this case, symmetrical...
Multilevel converters offer good quality load waveforms, which is clearly beneficial to its operation. A significant drawback that affects to all multilevel topologies is the high number of components required, which is related to a high fault probability. Among all the multilevel topologies, cascade multicell converters (CM), characterized by high modularity, allow for power to be easily increased...
This paper presents a performance analysis of a permanent magnet synchronous motor in a direct torque controlled drive under different faulty operating conditions. Considering the voltage source inverter, single power switch open-circuit faults and single phase open-circuit faults are introduced and their effects are investigated trough the analysis of some key parameters such as motor efficiency,...
In order to lower the cost and expand the working range of PWM inverter fed AC motor drives, the control methods under over-modulation conditions with only a DC link current sensor are investigated. A basic phase current reconstruction algorithm is developed for PWM inverters. Taking the over-modulation into account, the space vector PWM strategy and the switching state distribution for PWM inverter...
Three-level neutral-point-clamped (NPC) inverters are very appropriate for high-power adjustable-speed drive applications. Direct torque control is characterized by the merits of fast response, simple structure and strong robustness to motor parameters variations. This paper presents a 3-level inverter-fed direct torque controlled (DTC) induction motor (IM) drive based on optimized switching table...
In this paper, a hybrid filter topology is proposed to minimize voltage harmonics, current harmonics and EMI noises in PMSM with hysteresis direct torque control (HDTC). The filter topology consists of IGBT active filter (AF), high frequency LC filter and trap filter. The coupling of the AF compensated voltage and the motor main voltage is achieved through series 1:1 transformer. The AF detects the...
Frequency converters are used to increase the controllability and efficiency of electric motor drives. Induction motors may experience an insulation failure caused by an overvoltage at the motor terminals. The overvoltage is caused by an impedance mismatch between the motor terminals and the motor cable. Fast pulse rise times compared with the propagation delay in the motor cable will make the terminal...
This paper describes a control scheme for direct torque and flux control (DTC) of induction machines based on the stator flux orientation method. With the proposed hybrid control scheme, an inverter duty cycle is calculated via Lyapunov stability issue each switching period based on the torque and flux errors. The direct method of Lyapunov is used to analyze stability of the system and an hybrid control...
This paper describes a fast torque control system of permanent magnet synchronous motor (PMSM) based on model predictive control (MPC). This torque controller selects directly one of the voltage vector of voltage source PWM inverter considering voltage saturation explicitly. To obtain the fast torque response at the transient state and the stable current response at the steady state, the problem with...
Industrial applications often require two or more variable-speed electric drives, which have to be controlled independently. Over the past decade research efforts have been made to reduce the number of power electronic devices required in multi-motor drive systems in order to reduce the complexity and hence cost of the drive. One such drive system comprises n three-phase motors supplied by a (2n+1)-leg...
A decoupled parallel control of PWM inverters for AC motor drives is proposed in this paper. The control for sinusoidal reference synchronization, with variable frequency, and the control for load current sharing are decoupled by a local feedback. At first, the phase angle of the sinusoidal reference of each inverter is represented as a square signal and shared among the inverters. And the phase angle...
The objective of this paper is to propose a simple emulator of variable speed wind turbine generator, which consists of two inverters control two squirrel cage induction motors. One acts as prime mover and other acts as variable speed generator. As prime mover, the manual speed command is used to simulate as close as possible of wind turbine. As generator, the variable speed self excited induction...
This paper presents a new model for three level inverter using dual two level inverter. A space vector PWM technique is developed based on the combination of space vector from dual inverter feeding open end winding induction motor (OEWIM). A total of ??64?? combinations produce ??19?? operating vectors which make a hexagon shape similar to that produced by neutral point clamped three - level inverter...
This paper presents the practical implementation of three-level inverter using dual two-level inverter. A space vector PWM technique (SVPWM) is developed based on the combination of space vector from dual inverter feeding open end winding induction motor (OEWIM). A total of ??64?? combinations produce ??19?? operating vectors which make a hexagon shape similar to that produced by neutral point clamped...
As a novel electrical variable transmission (EVT) in hybrid electric vehicles (HEV), the dual mechanical port electric machine (DMPM) has been being researched and developed recently. In this paper, a control and drive system for permanent magnetic DMPM (PM-DMPM), consisting of the inverter unit and the control unit, is designed and developed. The inverter unit adopts a back-to-back inverter topology...
This paper presents the results obtained from testing of a direct torque controlled (DTC) field excited synchronous motor. The results obtained from testing will be compared to their equivalents obtained from simulation of the machine model using finite element method (FEM) software.
This paper proposes a square wave control strategy for a new boost-up converter which uses the leakage inductance of a motor instead of a boost up reactor. Since the power supply is connected to the neutral point of the motor, the current distortion in the power supply occurs when the inverter outputs square waveforms. First, this paper describes the characteristic of the proposed circuit and the...
This paper investigates the opportunity for energy saving in a 3-phase induction motor (IM) driving pump load and proposes an improved loss model control (LMC). Compared with other power loss reduction algorithms for IM, the presented one has the advantages of fast response, high accuracy, and simplicity of implementation. The performance of LMC depends mainly on the accuracy of modeling the motor...
The objective of this paper is to present an analytical method allowing large signal stability analysis of an electric system constituted by a DC power supply and its output filter connected to a constant power load. Here, the load is realized by a voltage source inverter motor mechanical load actuator system. We suppose that proper controllers are used to drive the actuator. Then, a large signal...
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