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This paper introduces two torque ripple suppression control methods for permanent magnet synchronous motor. With a system identification technique, the system model from compensating current input to torque detection output can be expressed as the speed-adjustable 1-dimension complex vector in the coordinate system synchronizing with the torque ripple frequency. The first method introduces a periodic...
Automatic generation control (AGC) is an important function for frequency control which is being implemented in the EMS system for the stable operation of power systems. The key feature of AGC is to back up governors for the control of system frequency of multi-machine systems. The governor has a role to regulate system frequency in several to ten seconds. But, the droop control concept which is applied...
Winding function method is adopted in this paper basing on air-gap magnetic flux density equations, and a new equivalent circuit is presented so as to analyze single linear induction motor (SLIM) applied in linear metro. Steady and dynamic performances of SLIM can be predicted by this circuit considering end effects, half filled slots, saturated iron and skin effect. To begin with, dynamic situation...
The doubly fed asynchronous machine is among the most used electrical machines due to its low cost, simplicity of construction and maintenance. In this paper, we present a method to synthesize a robust controller of doubly fed asynchronous machine which is the main component of the wind turbine system (actually the most used model), indeed : there is different challenges in the control of the wind...
This paper introduces a new fast speed regulation control strategy for HVF (high voltage frequency-converters) to facilitate the squirrel cage AC-motor reacting possibly fastest to the speed commands without over-current and instability. The basic principal is to regulate the frequency to follow the target currents which again follow the desired torques determined by the mechanical character of the...
Mathematical model of steady state operation of a unit consisted from frequency-controlled induction motor and centrifugal pump has been created. Influences of control strategies of frequency control on modal characteristics of the unit were investigated and recommendations on utilization of various control strategies are proposed.
This paper adopts winding function method in linear induction motor performance study and presents a new equivalent circuit. It can predict stable and transient performances considering end effects, half filled slots, saturated iron and skin effect. Furthermore, the model is able to analyze different working states considering various control schemes, such as scalar control, vector control, direct...
This paper describes the application of indirect adaptive fuzzy control to the speed controller of permanent magnet synchronous motor (PMSM) under external load disturbances and parameter variations in the plant. The proposed indirect adaptive fuzzy speed controller is based on feedback linearization and its parameters are updated by both speed tracking error and filtered prediction error, designed...
This paper proposes a dead-time compensation method with a disturbance observer and a current controller for V/f control. Dead-time compensation is very important to improve motor drive performances in the low speed region. The proposed compensation method is composed in the d-q rotational frame. The ripple of the d-axis current caused by the dead-time is suppressed by an auto current regulator, the...
A phase-difference angle (PDA) controlled pulse width-modulated (PWM) inverter instead of phase voltage modulation and/or frequency changing is proposed to control the speed, and position of a two-phase induction motor. Several characteristics of a two-phase induction motor driven by the PDA inverter are studied to verify the improvement of the motor performances. Also, speed, and position tracking...
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