Information supply of the power control system of the synchronous generator of the autonomous wind unit

Abstract

This paper deals with information supply of automatic maximum power control system of synchronous hybrid excited generator for the autonomous wind unit. The power supply system based on an autonomous wind turbine consists of an electric generator, a battery charging controller, a battery pack and an inverter, which provides the required frequency and value of the consumer's supply voltage. Three phase permanent magnet synchronous generator that have high technical and economic indicators are most widely used as electric generator of autonomous wind turbines. The main disadvantage of these generators is the lack of effective methods of magnetic flux control, limiting the optimization of the energy balance of the wind turbine. The paper discusses the application of synchronous generator with hybrid excitation system that consists of permanent magnets and additional field excitation winding located on the stator. Mathematical model of a hybrid excited synchronous generator is presented. Also, an output maximum power control system in a case of wind speed change by varying field excitation current is developed. Control system is developed based on concept of reverse task of dynamics in combination with minimization of local functionals of instantaneous values of energies. In the basics of the control method is put an idea of the reversibility of the Lyapunov direct method for the stability analysis. Obtained control law provides the system stability in whole, which allows solving control tasks of interrelated objects via mathematical models of local loops. Control law also provides low sensitiveness to parametric disturbances and gives dynamic decomposition of interrelated non linear system that ensures its practical implementation. The study of the proposed power control system based on parameters of hybrid excited synchronous generator experimental sample has been carried out. The graphs of transient process of armature power, voltage and current in a case of wind speed change from 3 to 8 m/s were obtained, as well as in a case of active resistance load change. The results of study showed high efficiency of power control of a wind turbine with hybrid excited synchronous generator.