Estimation of tip speed ratio using an adaptive perturbation and observation method for wind turbine generator systems

Variable speed control of wind turbine generator systems have been developed to get maximum output power at every wind speed variation, also called Maximum Power Points Tracking (MPPT). Generally, MPPT control system consists of MPPT algorithm to track the controller reference and generator speed controller. In this paper, MPPT control system is proposed for low speed wind turbine generator systems (WTGs) with MPPT algorithms based on optimum tip speed ratio (TSR) and generator speed controller based on field oriented control using type-2 fuzzy system (T2FS). The WTGs are designed using horizontal axis wind turbines to drive permanent magnet synchronous generators (PMSG). The simulation show that the MPPT system based optimum TSR has been able to control the generator output power around the maximum point at all wind speeds.

Download Full-text

Comparisons between the Wake of a Wind Turbine Generator Operated at Optimal Tip Speed Ratio and the Wake of a Stationary Disk

Modelling and Simulation in Engineering ◽

10.1155/2011/749421 ◽

2011 ◽

Vol 2011 ◽

pp. 1-7 ◽

Cited By ~ 6

Author(s):

Takanori Uchida ◽

Yuji Ohya ◽

Kenichiro Sugitani

Keyword(s):

Numerical Simulations ◽

Wind Turbine ◽

Speed Ratio ◽

Turbine Generator ◽

Velocity Deficit ◽

Wind Turbine Generator ◽

Tip Speed Ratio ◽

Stationary Disk ◽

Eddy Simulation ◽

Les Model

The wake of a wind turbine generator (WTG) operated at the optimal tip speed ratio is compared to the wake of a WTG with its rotor replaced by a stationary disk. Numerical simulations are conducted with a large eddy simulation (LES) model using a nonuniform staggered Cartesian grid. The results from the numerical simulations are compared to those from wind-tunnel experiments. The characteristics of the wake of the stationary disk are significantly different from those of the WTG. The velocity deficit at a downstream distance of (: rotor diameter) behind the WTG is approximately 30 to 40% of the inflow velocity. In contrast, flow separation is observed immediately behind the stationary disk (), and the velocity deficit in the far wake () of the stationary disk is smaller than that of the WTG.

Download Full-text

An offshore hydraulic wind turbine generator with variable-diameter rotor: Design, modeling and experiment

Proceedings of the Institution of Mechanical Engineers Part M Journal of Engineering for the Maritime Environment ◽

10.1177/1475090216661449 ◽

2016 ◽

Vol 231 (2) ◽

pp. 521-532 ◽

Cited By ~ 2

Author(s):

Weixing Chen ◽

Feng Gao ◽

Xiangdun Meng ◽

Anye Ren ◽

Songlin Zhou

Keyword(s):

Energy Conversion ◽

Wind Turbine ◽

Wind Power ◽

Offshore Wind ◽

Speed Ratio ◽

Turbine Generator ◽

Recovery Method ◽

Offshore Wind Power ◽

Wind Turbine Generator ◽

Variable Diameter

Offshore wind power is more abundant and stronger than the onshore, and more and more research enthusiasms have been raised in recent years. However, there are still many issues in the utilization of the offshore wind power such as the cost of installations and maintenance and the ability to resist extreme weather conditions. In this article, an offshore hydraulic wind turbine generator with variable-diameter rotor is presented. The diameter of the rotor can be regulated according to the wind speeds to achieve the maximum power coefficient. The hydraulic energy working as the transmission medium can improve the output power quality. The high-speed gearbox is removed, and the generator is installed on the platform, which facilitates the installations and maintenance. Here, the power conversion principle of the wind turbine generator was introduced first. Then, the dynamics and performance of the wind turbine generator was obtained. The relationship between the diameter of the rotor and the wind speed was established according to the dynamics and the optimum tip-speed ratio. Relying on the specific parameters, the dynamic response was calculated in Simulink. The results show that the instantaneous output of the wind turbine generator is relatively stable. Based on the power recovery method, the test platform was built, and the efficiency of the energy conversion device was tested. The experimental results demonstrate that the efficiency of the energy conversion device can be 88%. Finally, the total efficiency of the offshore hydraulic wind turbine generator was predicted to be 33.7%.

Download Full-text

Maximum Wind Energy Capturing of Wind Turbine Generator Based on Adaptive Inverse Controller

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.494-495.1825 ◽

2014 ◽

Vol 494-495 ◽

pp. 1825-1828

Author(s):

Wan Zhao Wang ◽

Jie Wang

Keyword(s):

Wind Energy ◽

Wind Turbine ◽

Speed Ratio ◽

Control Effect ◽

Turbine Generator ◽

Adaptive Inverse Control ◽

Inverse Control ◽

Wind Turbine Generator ◽

Maximum Wind ◽

Control Scheme

The variable speed wind turbine generator exhibits serious nonlinearity, uncertainty and difficulty accurate modeling, conventional PID controller can't achieve ideal control effect. In this paper, an adaptive inverse control scheme based on neural network identification technology is proposed to solve the above problem. The scheme firstly uses online identification of one DRNN to obtain the Jacobian information of plant. On this basis, another DRNN identifies the inverse plant model which constitutes adaptive inverse control system as controller. The simulation results verify that the adaptive inverse control scheme has excellent adaptability and robustness, which can make the actual rotational speed of wind turbine rapidly track the set point to maintain the best tip-speed ratio in order to get maximum wind energy capture in the random wind conditions.

Download Full-text