Using a Magnetic Continuously Variable Transmission for Synchronization of Wind Turbine Generators Under a Variable Wind Speed

The paper considers the principle of stabilization for the rotation speed with the use of a magnetic CVT in the form of a magnetic gearbox providing the required reduction coefficient. The paper is devoted to investigations of transients in a autonomous power system consisting of wind turbines with synchronous generators with permanent magnets under sudden change wind speed. The investigation involves the change of wind turbine power under the conditions of inconsistent increase of a wind speed due to remote position of wind turbines. Nowadays, this problem is being solved by the use of DC-links. There is a number of problems concerned with DC-links. One of them is generation of higher harmonics to the network. The paper considers the use of a magnetic continuously variable transmission for coupling of parallel operating turbines without a DC-link. The purpose of the study is dynamic stability stoke increase of local wind energy system by usage magnetic continuous variable transmission. However, there are problems concerned with resonance occurrence conditions that should be considered as constraints. Synthesis of this system with consideration of the magnetic coupling was performed with the development of the algorithm for stabilization of the specified rotation speed with above mentioned constraints. A tandem algorithm of rotation speed stabilization for an electric generator is presented. Note that a magnetic reducer represents a two-mass electromechanical system that may reduce the influence of a turbine torque on a transient process. The first section of the paper states the problem. The second section describes the proposed solution. The third section is concerned with investigations of transients under a variable wind speed.