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1 – 2 of 2Merzak Aimene, Alireza Payman and Brayima Dakyo
The purpose of this paper is to propose a new nonlinear control algorithm to control a wind turbine based on permanent magnet synchronous generator (PMSG) connected to the grid…
Abstract
Purpose
The purpose of this paper is to propose a new nonlinear control algorithm to control a wind turbine based on permanent magnet synchronous generator (PMSG) connected to the grid via a back-to-back converter. The control algorithm is composed of a flatness-based method for the machine side convertor (MSC) and a voltage-oriented method for the grid side converter (GSC).
Design/methodology/approach
For the MSC control, the output variable is chosen properly to prove that the system is flat at first. Then, the appropriate reference trajectories are planned on its components. The reference trajectories are such designed that the system operates in maximum power point tracking (MPPT) mode. Finally, state feedback regulators are used to force the system output to follow its reference. To control the GSC, a classical voltage-oriented control method is used.
Findings
The simulation results obtained with a random wind speed are presented in order to prove the validity of the proposed control algorithm. These results show that the system is controlled successfully while it operates in the MPPT mode or in its maximum power limitation mode.
Originality/value
In this paper, a new algorithm based on flatness property is presented to control a variable speed wind turbine based on a PMSG. The proposed control method allows the system to operate in optimal operating modes.
Details
Keywords
Payman Joudzadeh, Alireza Hadi, Bahram Tarvirdizadeh, Danial Borooghani and Khalil Alipour
This paper aims to deal with the development of a novel lower limb exoskeleton to assist disabled people in stair ascending.
Abstract
Purpose
This paper aims to deal with the development of a novel lower limb exoskeleton to assist disabled people in stair ascending.
Design/methodology/approach
For this purpose, a novel design of a mixture of motors and cables has been proposed for users to wear them easily and show the application of the system in stair climbing.
Findings
One of the prominences of this study is the provided robot design where four joints are actuated with only two motors; each motor actuates either the knees or ankles. Another advantage of the designed system is that with motors placed in a backpack, the knee braces can be worn under clothes to be concealed. Finally, the system performance is evaluated using electromyography (EMG) signals showing 28 per cent reduction in energy consumption of related muscles.
Originality/value
This investigation deals with the development of a novel lower limb exoskeleton to assist disabled people in stair ascending.
Details