This book puts forward a method to improve the stability of grid-connected wind farms. It makes a thorough and detailed study of wind turbine from two aspects: mechanical aspect, focusing on the improvement of transmission chain model and pitch control; In electrical aspect, various control methods suitable for wind farm are mainly introduced. In this book, the constant-speed wind turbine, variable-speed wind turbine, variable-pitch controller and hydrogen generator are introduced in detail, and the application of energy storage devices such as superconducting energy storage, capacitor energy storage, flywheel energy storage and static synchronous compensator/battery in wind farm is deeply discussed. This book is suitable for engineers, researchers and students working in the field of wind power technology, as well as anyone who wants to become a wind power expert with a good foundation in mathematics and physics.