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The paper presents for the first time the use of a low cost Hall effect position sensor for a synchronous reluctance machine (SynRM). The use of vector control for a SynRM requires information of the rotor position. Already the SynRM is independent of the use of permanent magnets (PMs) which results in reduced cost of the SynRM. Hence the use of a low cost position sensor contributes to an additional...
The paper is a result of the authors' researches in the field of energy area. The objective is to develop a power grid converter which includes all fundamental drive systems being capable to regenerate the energy into the grid. The topology fits very well to the hybrid renewable power systems, in order to control the green energy. Three-types of the electrical drives were included: the dc drive, the...
Based on previous research experience proved by simulated and experimental results a comparative discussion about advantages and disadvantages of using Vector Control or Direct Torque Control for PM-SM drives is presented.
This paper presents a new method of simultaneous estimation of speed and rotor resistance of an induction motor, from a sensorless vector control system. The simultaneous estimation of the speed, rotor flux and of rotor resistance is done by using an adaptive estimator, called the COS observer. To ensure the persistent excitation condition, in the vector control system, over the rotor flux reference,...
This paper analyzes the unbalance problem of a standalone cascaded doubly-fed induction generator feeding unbalanced three-phase load. Under this working condition, the output voltages become un-balanced and give rise to a negative sequence component. The classic vector control strategy does not provide the desired performance. A compensation method is proposed to balance the stator voltages. The...
A multiphase machine is more reliable than a three-phase one, but it usually shows reduced performance under faulty behaviour. In this paper, the performance in case of open-phase fault is analyzed, and two fault tolerant control algorithms, which aim to minimize the Joule losses in the remaining healthy phases, are compared. The proposed control techniques are validated by numerical simulations,...
Flux-switching permanent magnet machines (FSPM) show high-reliability and are quite suitable for the fields such as new energy, electric vehicle and aerospace. In this paper, the id=0 vector control strategy based on SVPWM was proposed. Besides, the high frequency signal injection method was used to identify the initial rotor position of FSPM. The experimental results proved the feasibility of the...
To enhance the reliability, sensorless vector control strategy based on sliding mode observer was adopted in flux-switching permanent magnet machine. The rotor position and speed estimation algorithm was obtained according to the voltage equation on αβ coordinate system of flux-switching permanent magnet machine, which contains the information of rotor positron. Further, a flux-switching permanent...
The switching frequency of high power traction driving system is very low. Aiming to improve the performance of speed sensor-less vector control in the case of low switching frequency (for example, it is low to 500 Hz), this paper introduces these technologies, such as multi-mode modulation strategy based on space vector pulse width modulation(SVPWM), design of the current regulator based on complex...
This paper presents a new slip compensation method for the traditional scalar control (V/f) of induction motors. Based on the level of q-axis component of stator current, the steady-state slip of motor speed is estimated by means of flux-oriented current tracking that is usually applied in vector control. The method features both the simplicity of scalar control and improvement on the performance...
In this paper, a new approach for achieving speed control of induction motor and three phase inverter output balanced currents under unbalanced grid voltage condition are presented. The proposed method is based on vector control of induction motor by using field oriented control. In unbalanced grid voltage condition, negative sequence components appear on the grid voltage vector, leading to distorted...
Recently, multiphase induction machines are proposed to replace traditional three-phase drives in low-voltage large power applications with high fault-tolerance ability. This paper concentrates on their speed sensorless vector control algorithm of multiphase induction machine. A full-order adaptive observer is adopted to observe the rotor flux and rotor speed, and a harmonic suppression method combined...
The article deals with a detailed description of phase control provided for the synchronous motor with permanent magnets basing on the simultaneous regulation of the motor supply voltage amplitude and phase. The phase control method makes it possible to implement a variety of motor control strategies at the expense of voltage vector purposeful formation, for example, setting to the maximum efficiency...
In this paper, a model of Permanent Magnet Synchronous Motor (PMSM) using vector control algorithm is built and simulated by MATLAB/Simulink based on TMS320F28035 DSP chip. Firstly, the principle of vector control theory and the mathematical models are expounded clearly. Then, the simulation system model is established according to the method adopted by motor and the target board type, moreover, the...
This paper discusses application of Multilevel Inverter (MLI) in closed loop control of induction motor. This topology of MLI is called Nested topology which helps in reducing harmonics thereby increasing & improving the level and quality of voltages respectively. Proposed topology increases efficiency of output by reducing the losses effectively. The work mainly focuses on Matlab simulation and...
An interior permanent magnet synchronous motor (IPMSM) model using the extended electromotive force (EMF) is one of the simple models and is used in sensorless vector control systems. This paper proposes a simplified system which takes into account a cross coupling compensation to estimate the rotor position without using observer. The effectiveness of proposed method is verified by simulation and...
Interior permanent magnet (IPM) brushless machines are widely used in various applications due to the advantages of high efficiency, high power density and wide constant power operating range and so on. However, the conventional vector control based on Park transformation with digital PI current controller can only serve for the control of fundamental current. This paper proposes a novel vector control...
IPMSM have attracted attention for its high efficiency. Extended electro motive force (EMF) based sensorless vector control system is one of the representative methods. In this paper, we propose a simplified sensorless vector control system without using an observer on the basis of the extended EMF. In order to verify the effectiveness of the proposed system, we perform stability analysis and comparison...
This paper presents a new compensation method about speed sensorless vector control of induction motor(IM). The proposed method calculates a direction of the flux by reducing the q-axis flux to zero which is obtained a flux observer. In order to stabilize the system at regenerating operation, a new compensation method is proposed. The effectiveness of proposed compensation method is confirmed by stability...
In the low speed sensorless control technology for permanent magnet synchronous motors, the traditional high frequency signal injection method cannot observe the rotor position accurately under the load. Therefore, in this paper, a novel sensorless control strategy based on the improved phase-locked loop and fluctuating high-frequency voltage signal injection method of observation is proposed, aiming...
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