Modular wind generators for autonomous power supply to remote mining areas mineral resources

Abstract

The use of renewable energy sources to supply power to energy-isolated areas is an urgent topic. The simplicity of the design and high reliability of inductor generators create good prospects for their use in wind power plants as an alternative to synchronous and asynchronous electric machines that are currently in use. An obstacle to such an application is the specifics of the design, construction, and execution of modular machines with magnetic switching, concentrated windings, and a distributed magnetic system integrated into the wind turbine design. The purpose of the study is to consider cause-effect relationships and establish relationships between magnetic flux, EMF, the geometry of electric and magnetic circuits, the structural arrangement of electric windings, and circuit solutions of an automatic electromagnetic excitation system for the design of a new type of generators. The current issues of the effective use of an exciting magnetic flux for voltage regulation in power supply systems powered by power plants, the main generators of which contain a distributed magnetic system with concentrated electric windings, are considered. The optimal structural compositions and geometry of the ratios of electric and magnetic circuits are determined from the machine's basic calculation equation, which is obtained under the condition of maximum magnetic flux. The reasons for the induction of variable EMF in the DC excitation windings, which prevent the effective magnetization of the machine, have been established. The location of the electric windings is proposed, which makes it possible to weaken or completely compensate for the pulsations of the magnetic flux coupled with the exciting circuits. It is established that in order to eliminate parasitic EMF in the exciting windings, it is necessary to use two-circuit circuits for alternating switching of the magnetic flux in the circuits, with sequential activation of the sections of the windings of the exciting circuits. To completely eliminate these EMFs, performing two-circuit magnetic flux switching circuits with a common exciting winding is advisable. The methods and features of the circuit implementation of the conditions of electromagnetic excitation and maintenance of voltage constancy at the output of generators of a new type are considered.