scholarly journals Optimal Sliding Mode Control of Permanent Magnet Direct Drive Linear Generator for Grid-Connected Wave Energy Conversion

2021 ◽  
Vol 6 (2) ◽  
pp. 50-57
Author(s):  
Adel Elgammal ◽  
Curtis Boodoo
Keyword(s):  
Optimal Control ◽  
Control System ◽  
Sliding Mode Control ◽  
Permanent Magnet ◽  
Wave Energy ◽  
Control Method ◽  
Sliding Mode ◽  
Direct Drive ◽  
Wave Energy Conversion ◽  
Ocean Wave Energy

the key goal of this article is on the design and optimum sliding mode control for Grid-Connected direct drive extraction method of ocean wave energy by Multi-Objective Particle Swarm Optimization (MOPSO). A Linear Permanent Magnet Generator simulates the ocean wave energy extraction system, driven by an Archimedes Wave Swing. Uncontrolled three-phase rectifiers, a three-level buck-boost converter and 3 level neutral point clamped inverter are planned grid integration of Wave Energy Conversion device. The technique monitors the three-level buck-boost converter service cycle linked to the PMLG output terminals and decides the optimum switching sequence of 3 level neutral point clamped inverter to enable the grid relation. Simulations using Matlab/Simulink were carried out to test working of the wave energy converter after the suggested optimal control method was applied under various operating settings. Various simulation test results indicate that the proposed optimum control system is tested in both normal and irregular ocean waves. And it has been shown that the control method of the MOPSO sliding mode is ideal for maximizing energy transfer efficiency. Better voltage management at the DC-link and for achieving greater controllability spectrum was accomplished by the proposed Duty-ratio optimal control system.

scholarly journals An Optimal Control Method for Maximizing the Efficiency of Direct Drive Ocean Wave Energy Extraction System

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Zhongxian Chen ◽  
Haitao Yu ◽  
Cheng Wen
Keyword(s):  
Optimal Control ◽  
Wave Energy ◽  
Pid Control ◽  
Control Method ◽  
Ocean Wave ◽  
Extraction System ◽  
Energy Extraction ◽  
Direct Drive ◽  
Ocean Wave Energy ◽  
Optimal Control Method

The goal of direct drive ocean wave energy extraction system is to convert ocean wave energy into electricity. The problem explored in this paper is the design and optimal control for the direct drive ocean wave energy extraction system. An optimal control method based on internal model proportion integration differentiation (IM-PID) is proposed in this paper though most of ocean wave energy extraction systems are optimized by the structure, weight, and material. With this control method, the heavy speed of outer heavy buoy of the energy extraction system is in resonance with incident wave, and the system efficiency is largely improved. Validity of the proposed optimal control method is verified in both regular and irregular ocean waves, and it is shown that IM-PID control method is optimal in that it maximizes the energy conversion efficiency. In addition, the anti-interference ability of IM-PID control method has been assessed, and the results show that the IM-PID control method has good robustness, high precision, and strong anti-interference ability.

Simulation of Control System for Permanent Magnet Synchronous Machine

2011 ◽  
Vol 66-68 ◽  
pp. 1422-1427
Author(s):  
Ting You ◽  
Pei Jiang Li
Keyword(s):  
Control System ◽  
Sliding Mode Control ◽  
Permanent Magnet ◽  
Disturbance Rejection ◽  
Sliding Mode ◽  
Synchronous Machine ◽  
Permanent Magnet Synchronous Machine ◽  
Mode Control ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control

For optimal control of synchronous machine, chattering phenomenon will appear if traditional slider control is adopted because permanent magnet synchronous machine is a complex nonlinear time-dependent system with strong coupling of current and rotational speed to cause the deterioration of system control performance with load or load disturbance. In this article, based on the mathematical model of permanent magnet synchronous machine, a control system for it, which combines sliding mode control and active disturbance rejection control, is proposed to improve the dynamic performance and robustness of control system. In the control system, sliding mode control is adopted to control the inner current of machine and active disturbance rejection control is adopted to control the outer speed. The load disturbance of system is also estimated and offset. The results of matlab simulation show that the control system can eliminate serious chattering phenomenon existing in sliding mode control, improves the robustness of system for load and system parameter disturbance as well as has great dynamic and static performance.

scholarly journals A Study on a Linear Magnetic-Geared Interior Permanent Magnet Generator for Direct-Drive Wave Energy Conversion

Energies ◽  
2016 ◽  
Vol 9 (7) ◽  
pp. 487 ◽  
Author(s):  
Ningjun Feng ◽  
Haitao Yu ◽  
Minqiang Hu ◽  
Chunyuan Liu ◽  
Lei Huang ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Permanent Magnet ◽  
Wave Energy ◽  
Direct Drive ◽  
Wave Energy Conversion ◽  
Interior Permanent Magnet ◽  
Permanent Magnet Generator

Design of a Linear Generator for Wave Energy Conversion in Peninsular Malaysia

2015 ◽  
Vol 793 ◽  
pp. 363-367
Author(s):  
Mohd. Aizuddin Firdaus Mohmad Hamim ◽  
Taib Ibrahim ◽  
Nursyarizal Mohd Nor
Keyword(s):  
Energy Conversion ◽  
Permanent Magnet ◽  
Wave Energy ◽  
Flux Distribution ◽  
Open Circuit ◽  
Maintenance Cost ◽  
Direct Drive ◽  
Wave Energy Conversion ◽  
Linear Generator ◽  
Permanent Magnet Generator

Malaysia is a small country surrounded by numerous oceans that can provide sufficient renewable energy for utilization. This work is to propose a design and modeling of a portable linear permanent magnet generator for the Wave Energy Conversion system that suits with the local wave parameters. Linear generator is preferable as compared to the rotary generator due to the direct drive technology that promises low maintenance cost. Three linear permanent magnet generator designs with different types of permanent magnet layout have been proposed as the permanent magnet used can provide better flux density compared to other topologies. Preliminary results for the air gap flux distribution and open-circuit flux distribution are demonstrated and discussed are shown to be as expected.

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