Application of Cooperative Control to Petroleum Plants Using Fuzzy Supervisory Control and Model Predictive Multi-variable Control

This paper describes hierarchical control with fuzzy supervisory control and model predictive multivariable control (MPC) in a petroleum plant. MPC is effective in time delay, interference, and handling constraints. Fuzzy logic controllers are effective for plants with large time delay and non-linearity. Our proposed hierarchical control combines their advantages. Fuzzy supervisory control, which determines set points for MPC, consists of an estimation block and a compensation block. We use a statistical model with multi-regression analysis for the estimation block to estimate parameters of plant operation, and fuzzy logic for the compensation block to correct output of the statistical model. Hierarchical control has been applied to an actual plant in an oil refinery, and showed satisfactory performance.

Download Full-text

The Design of LQR and Fuzzy Logic Controller for a Thermal System with Large Time Delay

Proceedings of the 2010 International Conference on Mechanical, Industrial, and Manufacturing Technologies (MIMT 2010) ◽

10.1115/1.859544.paper47 ◽

2010 ◽

pp. 293-298 ◽

Cited By ~ 1

Author(s):

Seiyed Zareh ◽

Ali Jahromi ◽

Atabak Sarafan ◽

Amir Khayyat

Keyword(s):

Fuzzy Logic ◽

Time Delay ◽

Fuzzy Logic Controller ◽

Large Time ◽

Thermal System

Download Full-text

Eigenvalue, Robustness and Time Delay Analysis of Hierarchical Control Scheme in Multi-DER Microgrid to Enhance Small/Large-Signal Stability Using Complementary Loop and Fuzzy Logic Controller

Journal of Circuits System and Computers ◽

10.1142/s0218126617500992 ◽

2017 ◽

Vol 26 (06) ◽

pp. 1750099 ◽

Cited By ~ 25

Author(s):

Hamid Reza Baghaee ◽

Mojtaba Mirsalim ◽

Gevork B. Gharehpetian ◽

Heidar Ali Talebi

Keyword(s):

Fuzzy Logic ◽

Time Delay ◽

Fuzzy Logic Controller ◽

Reactive Power ◽

Hierarchical Control ◽

System Stability ◽

Delay Analysis ◽

Large Signal ◽

Control Scheme ◽

Real Time Digital Simulator

In this paper, the proposed hierarchical control scheme adds new control loop to control the reactive power reference by a fuzzy logic controller to have the benefit of increasing the system stability margins and moreover, eigenvalue, robustness and time delay analysis of proposed control scheme are presented. The reported droop-based control methods of VSI-based microgrids including hierarchical droop-based control scheme are limited to primary and secondary control levels while the proposed control scheme is completely analyzed so that the three hierarchical control levels modeled for both grid-connected mode and islanded mode. This scheme maintains the stability of microgrids not only for the small-signal events, but also for large-signal disturbances such as three phase and single phase to ground faults, heavy motor starting, etc. However, power sharing to loads and network is sufficiently done. To demonstrate the effectiveness of the proposed hierarchical controller, simulation studies have been performed on a microgrid consisting of four units of distributed generation with local loads and in presence of main grid using MATLAB/SIMULINK software and validated using OPAL RT real-time digital simulator.

Download Full-text