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Maximum power point tracking (MPPT) has been widely studied since it is closely related to the efficiency of wind harvesting. Generally, there are two major approaches to realize MPPT. One is to reach the optimal power point by perturbing and observing the extracted wind power; the other is to reach the optimal power output by tracing the turbine power curve. Each approach has its pros and cons and...
This paper proposes a multi-objective optimal control and switching strategy for floating offshore wind turbines when the wind speed can be approximately predicted. The system is modeled as a hybrid automaton with two modes corresponding to the turbine operation in low- and high-speed wind profiles. The main control objective in the low-speed wind mode is to maximize the total captured power in a...
The stochastic nature of wind speed, time-varying of system parameters, system lagging and nonlinearities can lead to instability of the power generated by wind turbines. In order to improve the dynamic performance in the operation region of constant power output, multivariable control strategy using a sliding mode control technique is proposed based on analysis of the pitch-controlled system research...
This paper deals with the modeling and control of a Wind Energy Conversion System (WECS) based on a Permanent Magnet Synchronous Generator (PMSG). The WECS operate at variable speed and the control algorithm is based on Direct Power Control (DPC) with an AC/DC conversion system with a PI controller for the DC bus output. The laboratory test system is developed with an emulator of a wind turbine and...
This paper deals with direct control technique to control Permanent Magnet Synchronous Generator (PMSG) based variable speed Wind Energy Conversion System (WECS). This control technique is simple and has many advantages over indirect vector control technique like dependency on lesser parameters, number of controllers required will be less and there is no requirement of rotor position sensor. Furthermore,...
This paper aims to design a pitch control system for wind turbine to improve system dynamic performances. As winds turbines are a nonlinear, strong coupling systems, the sliding mode control is the best approach for its control. At first, a simple sliding mode controller has been developed and implemented on the turbine. Then, an improving sliding mode controller has been implemented in order to reduce...
The efficiency of the wind power conversions systems can be greatly improved using an appropriate control algorithm. In this work, an adaptive robust control for a variable speed wind power generation is described. A robust aerodynamic torque observer is also designed in order to avoid the wind speed sensors. The proposed adaptive robust control law is based on a sliding mode control theory, that...
Control system for wind turbine will operate with different objectives throughout its complete wind speed regions: from cut-in speed to cut-out speed. This paper presents a method for smoothly switching of controllers between these operating regions. The controllers designed in this paper are based on Pseudo Derivative Feedback (PDF), which provides smoother dynamic and simpler tuning of parameters...
This paper analyzes a topology consisting of a permanent-magnet synchronous generator and a Vienna rectifier for a wind energy conversion system. A control strategy leading to maximum efficiency is proposed. Simulation results reveal that this configuration is advantageous with respect to energy efficiency compared to a traditional six-switch two-level converter. Experimental results are provided...
Commercial wind driven electrical generation turbines are well engineered systems that economically extract power from the wind. These systems often restrict the range of turbine rotational speeds so as to facilitate connection of the generator to the electrical power grid. Recently research attention is turning to the possibility of operating the turbine and generator with a wide range of speeds...
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