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Induction motors are efficient in rated load, but its efficiency is reduced in light loads. Some controllers and techniques are presented in literature as a method to improve this performance, such the Search Controller (SC) and Loss Model Based Controller (LMC). To compare the response of efficiency controllers, the motor model is presented with current, speed and flux PI controllers. It is also...
Usually the estimation of speed is achieved by assuming that the rotor resistance is constant throughout the operating range. In practice, the variation of this resistance depends on the temperature inside the machine. This paper proposes a simultaneous rotor speed and rotor resistance estimation method for a conventional indirect stator flux oriented controlled (ISFOC) induction motor drive. In order...
Vector control is a most effective strategy to achieve rapid and accurate torque/speed control of AC motors. Its principle is to identify the machine rotor flux axis, and to then use this knowledge to control in-phase and quadrature current components to achieve precise torque control under varying load conditions. Accurate current regulation is essential for good vector control. However, while AC...
In this paper, we proposed methods of computing Proportional, Integral and Derivative (PID) parameters controller for vector control of induction motor. The optimal parameters for current loop, flux loop, and speed loop as function of required settling time and motor parameters will be computed by the proposed method. The significant of the proposed method is that one factor (settling time) is the...
Within this work we present a method of choosing the proportionality coefficient between the eigenvalues of the motor and the eigenvalues of the Luenberger Observer. The choosing of this coefficient is made based on the Routh-Hurwitz criterion considering that the controller within the adjustment mechanism is an adaptive type one. The tuning of the PI controller within the adjustment mechanism is...
High resolution optical encoders are used in industrial servo drives with position and/or speed control for providing the respective feedback signals. In applications with lower accuracy requirements resolvers are used as feedback sensors with respect to lower cost. As a resolver is nothing else than an electrical AC machine of special design, there is the basic idea to operate the servo motor itself...
A new speed sensorless control system for an induction motor with predictive current controller is presented. An adaptive observer system with high robustness against parameters variation is used for the control approach. The new observer computes a back EMF correctly even at zero speed and zero frequency. The current predictive controller is improved by utilizing the new observer system for different...
This paper presents a new maximum torque per ampere (MTPA) control method for Interior Permanent Magnet Synchronous Machine (IPMSM) drives. The proposed method uses the conventional speed control scheme, where speed control loop produces the magnitude of the stator current reference. According to the current angle in the rotor reference frame, ??, the current reference is decomposed to the d-/q-axis...
This study deals with the design of H∞ controllers for speed control of rotor flux-oriented current-controlled induction motors. The mixed sensitivity problem (robust stability and performance) is initially revisited, and is shown, based on practical experiments, that when the rotor time constant is the uncertain parameter, it is necessary to deploy conflicting weighting functions, therefore invaliding...
This paper presents a novel control technique for fault ride through of a DFIG-based wind energy system. Both unbalanced faults and balanced faults are considered. For unbalanced faults, a close to 120 Hz component will be present in the rotor currents. For balanced faults, the rotor currents will experience a surge. The control technique presented in this paper is effective in mitigating the high...
The modeling of wind power plants incorporating synchronous generator and full-converters for using in power system simulations is presented in this paper. In other words, all components of the above-mentioned power plant using typical values as well as their corresponding control systems are in details modeled and also simulated. The control strategy of the variable-speed wind turbine is the maximum...
This paper investigates the impact of the voltage source converter (VSC) current controller of a converter driven synchronous generator on the transient stability of a power system. The transient disturbance which the power network is exposed to is that of a three-phase short circuit. The transient response of the power system is firstly observed with system controllers' i.e. Automatic voltage regulator...
This paper introduces a genetic-algorithm-based PI controller for position control of permanent magnet synchronous motor. The algorithm is proposed for optimizing the PI controller gains in the position control. Different controllers' strategies are applied for the cascaded-loop position controller, speed controller and current controllers. The controllers are compared together to select the best...
This paper presents the use of a predictive technique to control the currents in a PMSM, driven by a voltage source inverter. This method allows for a high quality current control without using linear controllers and modulators, resulting in a conceptually simple solution. Simulation an experimental results confirm the good performance of the drive controlled by this method.
The purposes of this study are developed a servo drive system with fuzzy neural network (FNN) for a permanent magnet synchronous motor (PMSM) drive system based on digital signal processor (DSP). First, a field-oriented PMSM drive system which consists of a hysteresis-band current-controlled PWM VSI, a coordinate translation and sin/cos lookup table generation are implemented using DSP control system...
This paper presents a new control strategy for three-phase induction motor which includes independent speed & torque control loops and the current regulation thereby overcoming the limitation (i.e. sluggish response) of volts per hertz controlled industrial drives. For close-loop control, the feedback signals including the rotor speed, flux and torque are not measured directly but are estimated...
A novel structure of backstepping control has been proposed for indirect field oriented control of induction motor drive. Voltage and current signals are usually contaminated with high frequency switching noises due to SVPWM inverter. The proposed structure avoids real time integration and its associated drift problems, which in practice are the source of generation of unwanted noise. These problems...
This paper presents a new approach for hardware in the loop testing of voltage source inverters for drive applications. For this purpose the inverter is not connected to a real machine, but to a second power inverter instead, which acts like an electrical machine. Thereby the inverter under test can operate in its normal mode, which in the most of the cases is a field oriented current control with...
This paper focuses to apply the RST controller on the indirect-rotor-field-oriented-control (IRFOC) of a double star induction machine (DSIM). After fixing the reference models, some algebraic conditions permits to design the current and speed controllers. This step consists to find three polynomials R, S, T of the controllers by solving the Diophante equation. The RST controllers can ensure robustness...
BLDC motors have been gaining attention from various industrial and household appliance manufacturers, because of its high efficiency, high power density and low maintenance cost. After many research and developments in the fields of magnetic materials and power electronics, their applications to electric drives have increased to a significant extent. In this paper, the modeling of Brushless DC motor...
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