Open-loop controller

About: Open-loop controller is a research topic. Over the lifetime, 16148 publications have been published within this topic receiving 224014 citations. The topic is also known as: non-feedback controller & open-loop control law.

Analysis and implementation of a real-time predictive current controller for permanent-magnet synchronous servo drives

Abstract: A real-time predictive current controller for PWM inverter feeding PM synchronous motor is presented in which the accuracy and the robustness of the control are improved by integral compensation. In the proposed control scheme, a parallel control loop is used to compensate for the inaccuracy of the model and the variations in the motor parameters and in the DC voltage source. The proposed current control scheme is described and analyzed. The performance is studied and evaluated by computer simulation. The implementation of a real-time EPROM-based predictive controller is considered and discussed. The performance of the controller is evaluated using a prototype 1 kW PM synchronous servo drive. Experimental results are given and discussed. >

Implementation of adaptive fuzzy logic and PI controllers to regulate the DC bus voltage of shunt active power filter

Abstract: The output gain of the adaptive fuzzy controller (AFC), it is considerate as a fuzzy variable.This gain is adapted as a function of the voltage error and its variation.The comparative at PI controller study, shows that the adaptive fuzzy controller can be enhance the performances the DC voltage control at various operating.Experimental results validate the design methodology. Active power filter (APF) performance is entirely dependent on capacitor voltage. DC voltage optimization is one of the key aspects in harmonics compensation. This paper presents an experimental comparative study of new adaptive fuzzy controller (AFC) and proportional integral (PI) regulator, applied to regulate the DC bus voltage of three phase shunt APF. The proposed AFC for APF, consist to adapt the output gain of this controller at every situation of the system as a function of the voltage error and its variation. The algorithm used to identify the reference currents is based on the Self Tuning Filter (STF). The firing pulses of the insulated-gate bipolar transistors (IGBTs) inverter are generated using a hysteresis current controller; which is implemented on an analog card. Finally, the above study, under steady state and transient conditions, is illustrated with signal-flow graphs and corresponding analysis. This study was verified by experimental tests on hardware prototype based on dSPACE-1104.

Fuzzy PID Controller: Design, Tuning and Comparison with Conventional PID Controller

Abstract: In this paper, a fuzzy proportional integral derivative (PID) controller is proposed which can be tuned by carrying the tuning rules from PID domain to fuzzy domain. As a nonlinear controller can control a nonlinear process more efficiently, fuzzy controller can provide better performance in terms of rise time and smaller overshoot. The proposed controller is evaluated using some simulations. The simulation results show that both the transitory performance and the steady state performance are better than that of conventional PID controller.

Method and system for offline code validation

Abstract: A method of offline code validation and a process control system are provided. The system includes a plurality of sensors each configured to generate a sensor output value representative of a respective sensed parameter in a process plant, at least one process controller configured to receive one or more of the sensor output values and to generate a controller output value using the one or more of the sensor output values and a control algorithm associated with the at least one process controller, a plurality of controlled components configured to receive an associated controller output value, and an offline computing environment including a selectable model controller configurable to represent the at least one process controller, the model controller selectable by a user from code representing the at least one process controller and displayed on a user interface.

A Hybrid of Fuzzy and Proportional-Integral-Derivative Controller for Electro-Hydraulic Position Servo System

Abstract: Problem statement: While classical PID controllers are sensitive to variations in the system parameters, Fuzzy controllers do not need precise information about the system variables in order to be effective. However, PID controllers are better able to control and minimize the steady state error of the system. To enhance the controller performance, hybridization of these two controller structures comes to one mind immediately to exploit the beneficial sides of both categories. Approach: A hybrid fuzzy PID controller for the Electro-Hydraulic Position Servo System (EHPSS) was proposed in this study. The proposed control scheme was separated into two parts, fuzzy controller and PID controller. Fuzzy controller was used to control the piston when the piston locates far away from the target position. PID controller is applied when the piston is near the desired position. Results: We demonstrated the performance of control scheme via experiments performed on the EHPSS. Conclusion: The results from the experiments showed that the proposed hybrid fuzzy PID controller has superior performance compared to individual PID controller and fuzzy controller.