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This paper deals with Wind Energy Conversion System (WECS) control equipped by Doubly-Fed Induction Generator (DFIG). Based on variable speed wind turbine and aerodynamic torque estimation, high order sliding mode controller is developed to improve the dynamic performances of WECS by producing the required electromagnetic torque generator. The desired DFIG torque is directly tracked using the proposed...
According to the mathematic model of induction motor, a new method of speed estimation based on the neural network was presented in this paper. Based on the traditional adaptive system, the neural network replaces the original organization used in the speed-sensorless vector control system. A kind of new method of speed estimation based on the neural network, and the structure and learning algorithm...
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...
A sensorless method for the direct detection of the slip position of the wound-rotor induction machine is described in this paper. The slip position is necessary for the implementation of control by flux orientation. The method proposed is based on the phase comparison of estimated and measured rotor currents. The estimation of rotor currents is implemented in the field reference frame with the aid...
Recently, interior permanent magnet synchronous motor (IPMSM) drives are getting more popular in many applications such as electrical vehicles. In order to achieve maximum torque per ampere (MTPA), knowledge of the motor parameters is necessary. Due to the saturation effect, variation of the motor parameters such as inductances is not avoidable. The main contribution of this paper is to use the well...
This paper deals with the design of MRAS-based observer in speed sensorless induction motor drive. The option of reference coordinate of current model is focused on, for there exists an unstable region when the model is expressed in discrete form. An option of voltage model and current model in stationary and synchronous coordinate respectively, is proposed to allow the system to run stable in the...
In this article, we propose a field oriented control scheme of two stages. The first stage keeps the tracking of the angular velocity and simultaneously, regulates the flux modulus by means of the stator currents. These designed current signals are used as reference trajectories for the second stage. Both stages use observer based controllers of Generalized Proportional Integral (GPI) nature. The...
This paper investigates the problem of single-phase induction motor (SPIM) sensorless speed control. A discrete time PI controller and a sensorless technique are implemented on a PC-based platform using a standard three-phase inverter drive and vector control. An indirect rotor flux oriented control technique is developed based on a sensorless technique. A MRAS with a Kalman filter algorithm is developed...
This paper presents a sensorless predictive torque control. The predictive torque control is based on pre-calculation of the best switching state in order to keep the state variables close to desired values. The control scheme uses a proportional-integral controller inside of predictive control in order to improve the steady state response. The stator flux that determines the stator voltage is pre-calculated...
This paper investigates a sensorless direct torque and flux control (DTFC) scheme for IPM synchronous motor (IPMSM) drives at low speed and standstill. Closed-loop control of both the torque and stator flux linkage are achieved using two proportional-integral (PI) controllers. A high frequency signal injection technique is utilized at low speeds to obtain the rotor position information. The hybrid...
In this paper, we studied the vector control with orientation of rotor-flux by using PI regulators for an induction machine without speed sensor, and with adaptation of the rotor resistance. The rotor speed is estimated by using the model reference adaptive system approach (MRAS). This method consists of using two models. The first one is the reference model and the second is an adjustable one in...
This paper presents an online-correction method for current measurement errors for a pure-integration-based flux estimation down to a stator frequency of 1 Hz. A measurement- disturbance-observer (MDO)-based approach is taken as one possible solution for eliminating the dc offset and the additional negative-sequence component due to unbalanced current measurement gains in the synchronous coordinate...
This paper presents an improved speed sensorless vector control method for general-purpose induction motors (IMs). The proposed method is based on the d-q axis dynamic model of the induction motor and an improved closed-loop flux observer, which can achieve precise rotor and stator flux estimation over a wide speed range. And then, a rotor-speed-estimation method, based on fuzzy control theory, is...
A stator flux field oriented vector control design and implementation of sensorless three phase induction motor (IM) is presented in this paper. In proposed control scheme, the reference values of speed and stator flux are delivered to the nonlinear controller which consists of 5 separate PI controllers. A two level space vector modulation (SVM) inverter is employed to generate the required stator...
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