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A self-tuning two degree of freedom (2-DOF )PID controller based on fuzzy inference is presented. In view of the deficiency of conventional 2-DOF PID controller in the parameter time varying system, integrate the two-degree-of-freedom PID control with fuzzy techniques, a self-tuning PID controller based on fuzzy inference is designed. On-line automatically tuned parameters are realized at different...
A correction factor fuzzy-PID control method is adopted in order to solve the vibration of elevator cab because of the edge effect in the linear elevators driven by the permanent magnet linear synchronous motor (PMLSM). The fuzzy control has the characteristics of being not completely dependent on the mathematics model, but the fuzzy control rules are obtained by experiences of authors or knowledge...
By using MATLAB to simulate various speed control system, and uniting the GUI, the VL system for the movement control system is built, it can be used in INTRENET based on Dream-weave, ASP and Database technologies. The VL (virtual laboratory) system used as experiment teaching platform can solve the problems of limited experiment resources, and provide a convenient assistances for extensive study...
To solve the problems of torque ripple and inconstant switch frequency of inverter in the conventional direct torque control (DTC) for permanent magnet synchronous motor (PMSM) drive, a novel DTC method using space vector pulse width modulation (SVM) is proposed based on analysis of PMSM mathematical model. In this novel DTC system of PMSM , traditional torque hysteresis controller and flux hysteresis...
A new method of the model reference adaptive control for servo system what contains crawl phenomenon in a very low speed is presented based on hyperstability theory. In this paper, the mathematics model of the PMSM is studied, and basic hypothesizes is defined. The model reference adaptive controller is designed, and its stability is proved. Finally, the method is validated by simulating. Simulation...
A simplified predictive current controller for the three-phase bidirectional voltage source PWM rectifier is proposed. Firstly, the mathematic model in synchronous d-q coordinate is founded in the discrete-time domain. Then the simplified predictive current controller with state feedback decoupling is designed and analyzed. To overcome the drawbacks of the conventional predictive current controller...
The vertical motion control system and robust two-degree-of-freedom (2DOF) control for high rise/high speed elevators were discussed. The control aim is to realize robust tracking and re-leveling and let the system have good robustness for uncertainties under desirable control performances. A kind of robust 2DOF control method is proposed for elevators on the basis of vertical motion control. The...
The motor is the workhorse of industry. The control and identification of induction motor with artificial intelligence is the key point for high performance electrical drives. A novel architecture of nonlinear autoregressive moving average (NARMA) model based on wavelet neural networks (WNN) is presented for enhancing the performance of induction motor. The Akaikepsilas final predication error (AFPE)...
Through analyzing the shortcomings of the control system on the traditional cutting inverter, this paper presents the double close loop control system based on pole assignment for cutting inverter, which based on phase shift full bridge zero voltage switched (PS-FB-ZVS). This paper builds the small signal mode of PS-FB-ZVS PWM converter, and assigns the double close loop PI parameters by pole assignment...
A dynamic decoupling control approach based on neural network inverse system theory is developed for the AC-DC 3 degrees of freedom hybrid magnetic bearing (AC-DC 3-DOF HMB), which is a multivariable, nonlinear, strong coupled system. The configuration of AC-DC 3-DOF HMB is introduced briefly. The mathematics equations of radial and axial suspension forces are deduced. The analytical inverse system...
PWM control and one pulse control methods are useful in SPSRM(single phase switched reluctance motor). PWM method has safety for the low speed range to control SRM. And one pulse control method is proper to operate on high speed range in SRM for good energy efficiency and a considering switch frequency. Because PWM method is more safety than one pulse method, conversion of those is best choice according...
Adaptive front lighting system(AFS) is most advanced vehicle lighting system, which can greatly reduce driverpsilas fatigue degree when driving on curve road at night, make driver clearly see actual road surface at turn around, make driver have abundant time to deal with emergency, and evidently promote safety at night. Most high class vehicles have been fixed AFS in Japan, meanwhile AFS will be used...
This paper presents a modified direct power control (DPC) strategy for a doubly fed induction generator (DFIG) based wind power generation system under unbalanced grid-voltage conditions. The strategy is based on the investigation of the mathematic model and the composition of the instantaneous active and reactive power outputted by DFIG. It is found that, by applying a notch filter of two times of...
In order to improve the simulation efficiency, this paper presents a kind of switch-averaged model for the energy storage system to analyze its stability. This energy storage system is applied in metro vehicles that use supercapacitors as the energy storage elements to provide desired management of the power flows. In order to achieve quick response, an effective and simple control method using state...
A nonlinear adaptive robust speed tracking controller is presented for a three-phase surface permanent magnet synchronous motor (SPSMS) considering the control strategy of maximum torque control (MTC) related to this motor. Ignoring the motor iron losses, the proposed controller is designed based on combination of input-output feedback linearization (IOFL) control and adaptive sliding mode technique...
At present series decoupling and state feedback decoupling are commonly used decoupling control methods. In the three-phase voltage-source converter, decoupling control can effectively improve the dynamic and steady-state performance, but the performance of decoupling controller has great relations with the system parameters detection precision, and the robustness and dynamic performance of series...
A new kind of excitation control scheme in which the fuzzy control and neural network technique is integrated to the design of the generator nonlinear control is proposed. Based on the theory of the synchronous generator excitation control system, one machine-infinity power system nonlinear mathematical model expressed by state equation is established. A fuzzy RBF (Radial Basis Function) neural network...
Virtually all proposed vehicle control systems for highway automation must include a steady-state car-following mode. This mode was intensively investigated for various situations where headway and relative velocity inputs were used. In addition, a fundamental relationship between the flow capacity of an automated highway and the small-signal longitudinal response of a vehicle was investigated. The...
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