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Ultra-low speed control strategy is a difficult problem in the single gimbal control moment gyro (SGCMG) gimbal servo system. Speed detection resolution and disturbance torque attenuation are two major factors that restrict further improvements on the ultra-low speed control performance. In this paper, a novel ultra-low speed control strategy is proposed, including a multi-cycle backward difference...
This paper deals with the observer design for the Lur'e differential inclusion system with Markovian jump parameters. The information of transition probabilities is partially unknown. The stochastic observer is designed to make the error system exponentially stable in mean square. The condition for the existence of the stochastic observer is given by a set of linear matrix inequalities and linear...
The safe and stable operation of the large capacity thermal power unit must be seriously affected by the rapidly changed load when the unit participates in peak regulation. This paper takes a domestic 600MW steam turbine unit as an example, sets up a mass-spring model with lumped parameter method and calculates the torsional vibration responses of the shafts with the method combined Riccati transfer...
Aiming at the chattering problem of sliding mode control systems for brushless double-fed machines (BDFM), a control strategy named as high order sliding control with chattering avoidance is presented. A feedback linearization technology was adopted for the nonlinear model of BDFM. The results show that compared with traditional sliding mode control, high order sliding control can remove system chattering...
Two classical high frequency voltage injection methods based on saliency-tracking were introduced for initial rotor position identification in permanent magnet synchronous motors (PMSMs): high frequency rotating voltage (HFRV) injection and high frequency pulsating voltage (HFPV) injection. However, the injected voltage resulted in rotor movement, which was not allowed in some high accuracy applications...
In induction motor vector control system, the obtaining of accurate rotor flux is of essential significance. Based on the “assumed inherent sensor” reverse principle, a new method for observing flux is proposed. It firstly assumes that there exists a subsystem inside the induction motor, whose inputs are just the to-be-estimated variables while outputs the measurable variables and establishes the...
In this paper, a robust sliding-mode controller is proposed for a small-scale helicopter. The controller is designed by sliding-mode concept combining with an extended state observer. Sliding mode technique is adopted to derive the control law, and the extended state observer is applied to estimate the neglected items and disturbances. Together with these two approaches, attitude controller is designed...
This paper provides an improvement in sensorless control performance of surface permanent magnet synchronous motor(SPMSM). One method of the rotor position estimation by the complex number model based position estimator is proposed for the sensorless control of SPMSM. And, in order to eliminate the position estimation error that may be occurred by the uncertainty of motor parameters, a position type...
Based on Lyapunov stability theory, a holistic analysis approach is proposed for self-excited induction generator under no-load in the stationary reference frame with the transient mathematic model. Through analysis for initial transient states, a sufficient condition is fixed to be the limit cycle. The analytic formulas of the stator frequency, critical excitation capacitance and critical rotor speed...
Induction machines are critical components in several industrial processes and are frequently integrated in commercially available equipments. The reliability of an induction motor is of great Importance in industrial as well as commercial, aerospace and military applications. in This paper two kinds of induction motor faults, stator short circuit and broken rotor bar fault, are investigated. The...
This paper studies the Linear Parameter Varying (LPV) Takagi-Sugeno (T-S) fuzzy gain scheduling control of Wind Turbine Generation System (WTGS) below rated wind speed. The T-S fuzzy linearization approach is used to deal with the Affine Nonlinear Parameter Varying (ANPV) model of WTGS and the LPV T-S fuzzy model with required accuracy is obtained. Considering the maximum utilization of wind energy...
To suppress the phase current distortions of the inverter in permanent-magnet synchronous motor (PMSM) drive, an effective online approach for dead-time compensation of the inverter control using a simple disturbance voltage estimator is proposed. The dead-time elimination scheme does not depend on some undesirable characteristics of inverter, such as dead-time, turn-on/off time of switching devices,...
Microvibrations produced by high speed momentum wheels can highly degrade the performance of precision instruments in satellites. To suppress such microvibrations, one of the promising methods is to utilize the magnetically suspended momentum wheel (MSMW) due to the convenient and effective control strategy. However, little research is dedicated to the microvibrations caused by MSMW. This paper focuses...
Path optimization for the eddy-current on the surface of conductor is of great importance because the transmission efficiency of the permanent magnetic driver depends on the excitation level generated by the induced current. In this paper we focus on a kind of permanent magnetic driver with notched conductive plate with which the current path is optimized, the current is made to flow radically and...
A novel dynamic decoupling control method based on Linear Extended State Observer(LESO) for attitude stabilization of coaxial tri-rotor UAV is presented. Coaxial tri-rotor UAV system is a strong coupling, susceptible to disturbance, and multi-input multi-output (MIMO) system. High performance stabilization of such UAV is effected by virous uncertainties and disturbances which are difficult to measure...
The problem of designing transition flight controller via improved adaptive neural network dynamic inversion for Canard Rotor/Wing (CRW) UAV is studied. The transition control strategy from rotary-wing mode to fixed-wing mode is derived according to the flight characteristic analysis. The controller is composed of trajectory outer-loop and attitude inner-loop. The dynamic inversion method is used...
Control Method of Sensorless Brushless DC motor Based Neural Network is proposed by analysis of indirect position detection of DC Brushless motors' principles. Dynamical BP neural network model is built to identify the relation of phase voltage, phase current and rotor position of Brushless DC Motor. Network parameters gradient descent is employed to rectify error method in order to update the network...
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