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In this paper, the way to compensate for flux error caused by estimated stator resistance error will be suggested when PLPF is utilized as flux estimator, which is used for sensorless vector control of induction motor. For the highly efficient sensorless control, flux estimation method using PLPF has been widely used. To accurately obtain flux using PLPF, it is significant to estimate synchronous...
Asynchronous motor indirect vector control system has been widely used in industry, the system is simpler than the other vector control systems, but it's influenced by the motor's parameters, especially the rotor resistance, there is an error between the estimation of the rotor flux's position and the actual position. This paper analyses the influence of rotor resistance to the system and presents...
Due to its great potential value in theory and application, nonlinear control strategies of synchronous motors (SM), especially passivity-based control (PBC) methods, have been a focus in the literature. A PBC strategy for SM with time-varying load torque to track flux and speed trajectories is proposed in this paper. The key point of this method is the identification of terms, known as workless forces,...
This paper presents a high precision calculation of d-axis stator current, id to improve the performance of interior permanent magnet synchronous motor (IPMSM) drive over wide speed range for high performance industrial drive applications. The Newton-Raphson method (NRM) is used for computation of flux component of stator current, id. Traditionally, the stator resistance is neglected to calculate...
Inter-turn short circuit fault (ISCF) detection, in permanent magnet synchronous machines (PMSM) was developed using a physics-based back electromotive force (EMF) estimator. The electro-thermal saturation-dependent model of the machine was employed in the heart of the open loop estimator. The fault detection system works based on the difference between the estimated EMF and a reference EMF. A 0.8...
In vector control system of PMSM, the change of temperature and electrical current in different operating conditions would cause variation in the machine parameters. This will lead to the current loop PI parameters and the actual operating conditions do not match, as a result the system performance would have a serious decline. To solve this problem, the Recursive Least Squares method with forgetting...
This paper presents the design process of a slotted TORUS axial-flux permanent-magnet motor suitable for direct drive of an electric vehicle through sizing equation and Finite Element Analysis. AFPM motor is a high torque density motor which can be easily and compactly mounted into the automobile's wheel fitting the rim perfectly. A double-sided slotted AFPM motor with 6 rotor poles for high torque...
This paper describes online method of synchronous motor parameter identification (online improved frequency analysis). Paper mainly describes the identification harmonic signal injection in the online mode, and various adjustments that have been made on the original offline methods for using in the online mode. These adjustments increase the sensitivity and speed of identification, however various...
In this paper, a method for estimating the rotor speed of induction motor is proposed. The proposed method is based on the state observer theory. By applying the proposed method, the induction motor control system owns the ability to estimate both the rotor speed and the stator resistance of the induction motor simultaneously. The speed sensorless controlled system based on the proposed method has...
Oil field pumping load unit has a very high demand on the drive motor with starting capability and the maximum torque, so when we design the motor parameters, how to coordinate the relationship between pull-in performance and the maximum torque becomes very meaningful. Based on the dq0 coordinate system mathematical model, this paper do a digital simulation on the starting process of an energy efficient...
An off-line parameter identification of induction motor based on RLS algorithm was presented in the dissertation. Figuring out the Bart wirth digital filter state equation through improved euler numerical solution, the filtering value of signal was got, and the first-order derivative and the second-order derivative also were got directly. It avoids the error influence of derivative discretization...
In case of three-phase short circuit fault occurring at the terminal of a doubly-fed induction generator (DFIG), the rotor current characters of DFIG are analyzed from the viewpoint of the flux linkage, and the expression of the rotor current is deduced together with the estimated expression of the maximum rotor current. Based on above analysis, the max rotor currents and their appearing times with...
This paper presents a method for estimation of induction motor parameters. The proposed approach uses analytical relations to identify the 3rd order model parameters. The method transforms the 3rd order nonlinear model to a linear regression equation. In this study, the field voltage is considered as the input and the active and reactive output power and the rotor speed are considered as the outputs...
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...
The real thermal condition knowing inside the machine is very important for the exploitation and control of induction motor (IM). This paper provides the reasons for parameter changes which cause problems of IM control. Here are presented various methods of IM parameters estimation as a way for better control of IM. Various methods of IM parameters change are presented as a way for better control...
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...
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...
Nonlinear control strategies of variable speed constant frequency(VSCF) wind power generator systems, especially passivity-based control(PBC) methods, have been a focus in the literature. The main purpose of this paper is to develop a control algorithm that forces the wind driven doubly fed induction generator(DFIG) to track reference flux and speed trajectories with time-varying load torque. To achieve...
This paper proposes a method to estimate the electrical parameters of Induction Motors, The electrical parameters are obtained by solving a least squares minimization problem, the method conceived to be used estimate parameters with the vector control strategy and the M sequence disturbing on the reference voltage. And experimental results are used to demonstrate the feasibility of the propose method.
This paper purposes an adaptive parameter estimation algorithm which is basis on the decoupled vector control modeling of DFIG. Through designing state observer and selecting a proper Lyapunov function, the parameters of DFIG can be estimated, the simulation and experiment shows the feasibility of this method.
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