COMPARATIVE EVALUATION OF THE FORCING MODES OF THE SYNCHRONOUS GENERATOR OF AUTONOMOUS GENERATING UNIT

Abstract

The influence of capacitive energy storage in the excitation circuit of synchronous generator on the process of voltage output regulation of autonomous generating unit by means of consumer comparable capacity connection has been investigated in the article. Control criteria of excitation circuit, which should be carried out not only as a function of voltage on the stator but also as a function of the derivative of the electromagnetic torque angle of a synchronous generator have been analyzed. The influence of capacitive energy storage in the circuit of a synchronous generator excitation on increasing the life activities of independent generating units has been studied. It has been proved that the limited capacity of existing thyristor exciters and devices of automatic excitation regulation can be significantly expanded. The most effective way to implement the given problem is excitation forcing with a capacitive compensation of excitation circuit inertia by discharging of a precharged capacitive energy storage in this circuit while supplying the forced voltage from thyristor converter. The developed device with capacitive energy storage will allow automatic regulation of the excitation of synchronous machines, providing high quality transient processes, and improvement of synchronous machines reliability at undervoltage on the stator or at supplying the consumers of commensurate power. The brought mathematical models and algorithm of control over to the contour of excitation. The adequacy of forcing excitation processes in existing and developed circuits has been studied by proposed device that provides the modes of forcing taking into account the operation mode of synchronous generator. It has been proved that the speed performance of the forcing process of the excitation current with energy storage is much higher in comparison with existing excitation systems.