Modeling and Control of a Flexible Input Boost Chopper Linked to AC Drive System

2011 ◽  
Vol 383-390 ◽  
pp. 4352-4357
Author(s):  
Ze Yun Chao ◽  
Wei Jia Fang
Keyword(s):  
Dynamic Performance ◽  
Mathematic Model ◽  
Input Voltage ◽  
Drive System ◽  
Modeling And Control ◽  
Ac Drive ◽  
Ac Motor ◽  
Battery Packs ◽  
Constant Output ◽  
And Control

In order to assure the inverter could operate either from rectifier utility power or battery packs to provide regulated sinusoidal power for ac motor, a boost chopper with flexible input voltages and constant output voltage usually used to offer the link dc voltage to ac drive system. In this paper, the objective is to propose a new control scheme to assure the boost chopper has good dynamic performance under the disturbance of input voltage and load. The mathematic model of the boost chopper based on PWM three-terminal switch device is discussed. The test results show that the proposed control system has robust performance with whether the disturbance of input voltage or loads.

Control Strategies for AC Motor of Electric Vehicles

2013 ◽  
Vol 724-725 ◽  
pp. 1409-1412
Author(s):  
Da Fang Wang ◽  
Zhen Fei Hu ◽  
Na Li ◽  
Yi Jin ◽  
Bo Wen Yang
Keyword(s):  
Electric Vehicles ◽  
Control Strategies ◽  
Dynamic Performance ◽  
Direct Torque Control ◽  
Drive System ◽  
Torque Control ◽  
Ac Drive ◽  
Ac Motor ◽  
Control Schemes ◽  
Speed Performance

Electric Vehicles (EVs) have been the important tendency of future vehicle development. This paper discusses the performance and features of EVs with AC drive system, and analyzes two dominating control schemes of AC motor dynamic model, i.e., Vector Control (VC) and Direct Torque Control (DTC). Principles, advantages, disadvantages, research hot spots and developing directions of the two control schemes were carefully presented. Moreover, the paper points out that the two difficulties of AC drive system are improving low-speed performance and dynamic performance.

Research on Modeling and Control Strategy for Two-Stage Photovoltaic Grid-Connected System

2014 ◽  
Vol 1008-1009 ◽  
pp. 16-21
Author(s):  
Xia Dong ◽  
Li Na Zhang ◽  
Yu Ying Fu ◽  
Cui Lian Ji
Keyword(s):  
Control Strategy ◽  
High Performance ◽  
Dynamic Performance ◽  
Mathematic Model ◽  
Two Stage ◽  
Lcl Filter ◽  
Modeling And Control ◽  
Point Tracking ◽  
Power Point ◽  
And Control

This paper has built the mathematic model of the single-phase two-stage photovoltaic(PV) grid-connected system. The model consists of a boost DC/DC converter and a DC/AC inverter with LCL filter. On the basis of the variable step perturbation and observation method(P&O), the boost converter changes the output voltage of the PV array by adjusting the duty cycle to realize the PV maximum power point tracking(MPPT). The inverter system restrains the voltage fluctuation effectively by using feed-forward of the grid voltage and current tracking control technology, which has the high performance in both sinusoidal reference tracking and disturbance rejection. LCL filter improves the dynamic performance and restrains the high harmonics efficiently. The simulation with Matlab soft confirms the effectiveness of the model and control strategy.

Compensation of the Nonlinear Effect on Anelectro Hydrostatic Cylinder Driver for the Transit and Rotating Motion Using Bilinear System

2014 ◽  
Vol 875-877 ◽  
pp. 2097-2106
Author(s):  
Rai Wung Park
Keyword(s):  
High Performance ◽  
Nonlinear Behavior ◽  
Bilinear System ◽  
Mathematic Model ◽  
Modeling And Control ◽  
Extended Application ◽  
Physical Information ◽  
Complete Form ◽  
And Control ◽  
Operating Points

The transit motion and the rotating motion have highly different effects in a technical systems and have almost nonlinear system behaviors. For the descriptions of their dynamical causes and effects on system, the physical information, which is concerned as a nonlinear mathematic model, has been used. But the corresponding equations are generally not easy to solve in complete form or their solutions are so complicated to see through the coherence. A common way to settle such a problem is to linearize system exactly in a state space or on a operating points with Taylor's series approximately. An advanced method to an approximation is a bilinear system that offers global separations principle. In this paper, an extended application of this theory is given in a modeling and control on the electro hydrostatic cylinder driver with both the transit and rotating motions for the keel system that mostly have not only advantage of high performance, small volume of building and weight but also high nonlinear behavior.

The Modeling and Control of the Hydraulic Servo System by Using On-Off Valve

2000 ◽  
Author(s):  
Xuanyin Wang
Keyword(s):  
Servo System ◽  
Mathematic Model ◽  
Hydraulic Cylinder ◽  
Servo Control ◽  
Linear Quadratic ◽  
Modeling And Control ◽  
Hydraulic Servo ◽  
Self Tuning ◽  
Hydraulic Servo System ◽  
And Control

Abstract This paper researches on the hydraulic servo system by using ordinary on-off valves. The mathematic model of an asymmetric hydraulic cylinder servo control system is built, and its characteristic is analysed here. To reduce the static and dynamic characteristic differences between forward and reverse motion of asymmetric cylinder, and improve system’s performance, a self-tuning linear quadratic gaussian optimum controller (SLQG) is designed successful. In the end, an asymmetric hydraulic cylinder servo system of paint robot is researched. The result shows that the above method is effective.

Dynamic Modeling and Control Techniques for a Quadrotor

2019 ◽  
pp. 20-66
Author(s):  
Heba Elkholy ◽  
Maki K. Habib
Keyword(s):  
Pid Controller ◽  
Degrees Of Freedom ◽  
Sliding Mode ◽  
Dynamic Performance ◽  
Simulation Environment ◽  
Modeling And Control ◽  
Controller Gain ◽  
Aerial Vehicle ◽  
And Control ◽  
The Mathematical Model

This chapter presents the detailed dynamic model of a Vertical Take-Off and Landing (VTOL) type Unmanned Aerial Vehicle (UAV) known as the quadrotor. The mathematical model is derived based on Newton Euler formalism. This is followed by the development of a simulation environment on which the developed model is verified. Four control algorithms are developed to control the quadrotor's degrees of freedom: a linear PID controller, Gain Scheduling-based PID controller, nonlinear Sliding Mode, and Backstepping controllers. The performances of these controllers are compared through the developed simulation environment in terms of their dynamic performance, stability, and the effect of possible disturbances.

Modeling, Control, and Validation of Electrohydrostatic Shock Absorbers

2015 ◽  
Vol 137 (1) ◽  
Author(s):  
Renato Galluzzi ◽  
Andrea Tonoli ◽  
Nicola Amati
Keyword(s):  
Dynamic Performance ◽  
Working Environment ◽  
Modeling And Control ◽  
Active Devices ◽  
Shock Absorbers ◽  
Damping Control ◽  
Variable Damping ◽  
And Control ◽  
Damping Systems

The implementation of variable damping systems to increase the adaptability of mechanical structures to their working environment has been gaining increasing scientific interest, and numerous attempts have been devoted to address vibration control by means of active and semi-active devices. Although research results seem promising in some cases, the proposed solutions are often not able to fulfill requirements in terms of compactness and simplicity on one hand, and dynamic performance on the other. In this context, the present paper discusses the modeling and control of an electrohydrostatic actuation (EHA) system for its implementation as a damping device. A model of the device is proposed and analyzed for design purposes. Subsequently, a damping control strategy is presented. Finally, a case study introduces and validates an EHA prototype for helicopter rotor blade lead–lag damping.

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