The main achievements and methods in studying adaptive control, deferential geometric control used in the stability of wind energy conversion system, speed control system and maximum-power transfer are surveyed in this paper, and certain of problems remained to be solved are proposed simultaneously.

The main achievements and methods of variable structure control, deferential geometric control, H_(∞) robust control ,linear optimal control, adaptive control, fuzzy logic control, neural network control, Expert system control and synthesis intelligent control were used in the control of wind energy conversion system stability, speed control system and maximum-power point tracking were surveyed in this paper, and some of problems to be solved were proposed simultaneously.

The main achievements and methods in studying adaptive control, deferential geometric control used in the stability of wind energy conversion system, speed control system and maximum-power transfer are surveyed in this paper, and certain of problems remained to be solved are proposed simultaneously.

The main achievements and methods of variable structure control, deferential geometric control, H_(∞) robust control ,linear optimal control, adaptive control, fuzzy logic control, neural network control, Expert system control and synthesis intelligent control were used in the control of wind energy conversion system stability, speed control system and maximum-power point tracking were surveyed in this paper, and some of problems to be solved were proposed simultaneously.

The Askervein Hill project was a collaborative study of boundary-layer flow over low hills carried out under the auspices of the International Energy Agency Programme of R >amp;amp; D on Wind Energy Conversion Systems.

Wind Energy Conversion A process that uses energy from the wind and converts it into mechanical energy and then electricity.

Wind energy conversion systems convert the kinetic energy of the wind into electricity or other forms of energy.

The objective of the project was to investigate a means of enhancing wind energy conversion efficiency.

The paper also describes the recent R>amp;D programs in wind energy conversion systems.

In order to strengthen the energy density of wind flowing through the wind turbine, a system which can highly collect wind energy is presented and the author analysed the optimal conversion rate of wind energy under various working conditions. It also gives the: theoretical and practical maximal value of the nominal utility coefficient of wind ener-gy Theoretical analysis and experiments show that the optimal conver-sion rate of wind energy of the system depends on the stagnant state of nature wind, exit pressure...

In order to strengthen the energy density of wind flowing through the wind turbine, a system which can highly collect wind energy is presented and the author analysed the optimal conversion rate of wind energy under various working conditions. It also gives the: theoretical and practical maximal value of the nominal utility coefficient of wind ener-gy Theoretical analysis and experiments show that the optimal conver-sion rate of wind energy of the system depends on the stagnant state of nature wind, exit pressure of the system and the adiabatie exponent of air. The nominal utility coefficient of wind energy of the system can exceed that of conventional wind energy conversion system (WECS) by several times or even over ten times. The condusion is that the system will be able to increase the output power of wind turbine of the same size by several times to over ten times.

In this paper, one new type wind energy conversion system called "Inclined Axis Wind Turbine" is introduced and brief analyses of its characteristics and behaviour are presented. It has a great future, and espetially suits to the specific areas which are not suitable for installing the Horizontal Axis Wind Turbine, such as the water, the beach and the desert. The Momentum-Blade theory is deduced which is widely used to calculate performances of Horizontal Axis Windjurbine. A concept of Thrust...

In this paper, one new type wind energy conversion system called "Inclined Axis Wind Turbine" is introduced and brief analyses of its characteristics and behaviour are presented. It has a great future, and espetially suits to the specific areas which are not suitable for installing the Horizontal Axis Wind Turbine, such as the water, the beach and the desert. The Momentum-Blade theory is deduced which is widely used to calculate performances of Horizontal Axis Windjurbine. A concept of Thrust Linear-density is led into so that the Momentum-Blade theory can be used in the case that the induced velocity in-homogeneous ly distributes along the actutor, for example, the Inclined Axis Wind Turbine. With the help of analytic Geometry of Three Dimensions, relations among all variables are deduced, an aerodynamic model of the IAWT thus can be established by use of the deduced Momentum-Blade theory. This model can computer performances of the IAWT, design and optimize blades and provide the theoretical foundation to plan the whole turbine. Otherwise, the model can count performances of HAWT in crabbing to limit rotating speed. At last, several relationship curves are presented.

This paper gives a brief outline of the research activities of wind engineering in China in the past fifteen years. Important results obtained by means of laboratory simulation test, in-situ studies as well as analytical and numerical methods are indicated. It covers wind characteristics, bluff body aerodynamics, wind effects on buildings and structures, atmospheric diffusion and dispersion of pollutants, aerodynamic characteristics of transportation systems, wind energy conversion and other aspects of...

This paper gives a brief outline of the research activities of wind engineering in China in the past fifteen years. Important results obtained by means of laboratory simulation test, in-situ studies as well as analytical and numerical methods are indicated. It covers wind characteristics, bluff body aerodynamics, wind effects on buildings and structures, atmospheric diffusion and dispersion of pollutants, aerodynamic characteristics of transportation systems, wind energy conversion and other aspects of wind engineering. A number of wind tunnels designed specifically to generate simulated atmospheric boundary layer stream are listed. Seventy references are provided at the end of the paper for details.