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This paper describes fuzzy cooperative coevolution adaptive control which uses a common genetic algorithm to obtain the coefficients of the adaptive fuzzy regulator. The plant under consideration is multi-mass drive system with elastic couplings. A comparison between systems with fuzzy control and conventional PID-control is considered. It is shown that fuzzy method allows to suppress torsional vibrations...
This paper presents an anisotropy-based position estimation approach taking advantage of saturation effects in permanent magnet synchronous machines (PMSM). Due to magnetic anisotropies of the electrical machine, current responses to high-frequency voltage excitations contain rotor position information. Therefore, the rotor position can be estimated by means of these current responses. The relation...
This paper presents results of simulation research of off-line trained, feedforward neural-network-based state estimator. The investigated system is the mechanical part of electrical drive characterized by elastic coupling with working machine, modeled as dual-mass system. The aim of the research was to find a set of neural networks structures giving useful and repeatable results of the estimation...
In this work is presented predictive speed controller for induction motor. It is proposed to divide the control process into two parts: coarse adjustment and regulation in the area of steady state. This allows to reduce the pulsations in obtained waveforms in steady state.
In this paper, a highly efficient drive system for constant rotational speed applications, including a doubly fed permanent magnet synchronous machine (DFPMSM), will be presented. Due to loss minimization, most of the stator windings of the DFPMSM are directly fed by the electrical grid, while only some of the stator windings are fed by a low-power inverter to stabilize the complete drive system.
The power and torque density of transverse flux machines could be advantageous in many applications. However, until now a widespread use of TFMs is restricted by concernings with manufacturing as well as control and sensorics hardware. The first point is resolved by the construction of the TFM DYNAX, which is suitable for series production. Thus the next step is to simplify control hardware. This...
This paper will present a simplified control algorithm for synchronous reluctance machines (SynRM) in low-voltage applications. In this specific case, the entire drive train, including the battery, is considered. The difficulty of the non-linearity of the SynRM is estimated using an adapted model, based on the measured values. The model parameters have been determined through a repeatable method and...
Due to simple mechanical design, resulting in low manufacturing costs, combined with high efficiency and power density, the synchronous reluctance machine (SynRM) is continuously establishing itself as an important machine type for inverter-fed electrical drives. Especially in high volume applications, e.g. traction drives, the SynRM could replace induction machines (IM) by means of significant reduction...
The main topic of this article was to evaluate control structure with reference model for control of electric drive. The well known cascade control structure is used in industrial electric drives control units, where current, speed and position loops are encapsulated together. The control theory knows the advanced control structures where reference model and real plant behavior is compared to obtain...
This paper presents preliminary results in the frame of the development of a very high speed synchronous drive with a rated power of 6 kW at the rated speed of 180 krpm taking place in the context of a university-industry partnership. Due to the very high speed, direct sensors, for speed and position, must be avoided. This paper presents the use of very sensitive back-emf based position and speed...
Usually, electrical propulsion vehicles are driven by highly dynamic drive controls. To make this possible, it is important to know electrical parameters such as inductances, flux and stator resistance as exactly as possible. In particular, the ohmic stator resistance Rs changes during operation due to temperature changes. Therefore, it is not possible to achieve a high precision over a wide operating...
Practical accommodation of a gain scheduling mechanism for the current controllers in the field oriented vector control scheme for PMSM drives is discussed in this paper. Real time adaptation of the compensator parameters relies on information extracted from the torque linearity curves of motors. The motor electrical equivalent model has been considered as a nonlinear control object. The nonlinearity...
This paper presents a model predictive current controller and its application to the inner current control loop of a field oriented controller. In a stationary reference frame, the proposed control scheme keeps the α and β currents within given hysteresis bounds while minimizing the switching frequency of the inverter. Based on an internal model of the drive, the controller predicts the drive's future...
This paper presents a novel solution to the sliding mode output feedback control for uncertain discrete-time systems, which is aimed at electronic embedded motion control of implementation designs. The uncertainty is considered mismatched and with an unknown bound, which is identified by the proposed dead-zone adaptive law. The uncertain discrete-time system is made asymptotically stable under the...
Interior permanent magnet synchronous machines (IPMSM) are preferably used for traction drives in electric vehicles. These are characterized by high efficiency and high torque as well as power density. The generation of reference currents for the field-oriented control is realized by look up tables (LUT). In these LUT the entire machine characteristic is described. The reference currents are selected...
This paper introduces a novel approach to identifying the ohmic stator resistance Rs of permanent magnet synchronous machines (PMSM) based on low frequency signal injection. The identification does not depend on specific speed or load conditions. Besides the value of Lq(id, iq), no further electrical parameter is needed for the identification algorithm. The proposed stator resistance identification...
This paper presents a comparative analysis of two Model Direct Predictive Controllers (MDPC), which are applied to the inner loop current control of a field-oriented control scheme for an ac drive. A model of the controlled system which includes the dynamics of the inverter (boolean and discrete) and also of the machine (continuous) is employed to predict the future stator currents for a pre-defined...
This paper describes design of a new control and PWM algorithms for a main drive of a multisystem locomotive with special focus on investigation into the trolley-wire current which could disturb railway safety systems. Designed control is based on rotor flux oriented vector control in Cartesian coordinates which is unusually operated due to specific PWM in whole speed range. We employ a synchronous...
A model predictive DTC algorithm used for the Lyapunov stability function based DTC of induction motor control is presented in the paper. It is proposed as an alternative to the classical approaches based on the look-up tables, where the contribution of electromotive force is not considered. An appropriate Lyapunov function is chosen and, based on its derivative, optimal stator voltage vector is determined...
Challenges and proven solutions dedicated to the field oriented vector control (FOVC) of magnetically saturated permanent magnets synchronous motors (PMSM) are discussed in this paper. It has been noticed that in case a PMSM operating in magnetic saturation the feedback currents in the d- q-reference frame oscillate at six times the electrical frequency. The oscillation mechanism has been analyzed...
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