METHODS FOR REDUCING ACTIVE POWER OSCILLATIONS BETWEEN GENERATOR UNITS AND PROSPECTS FOR USING GENERATORS WITH LONGITUDINAL-TRANSVERSE EXCITATION IN AUTONOMOUS POWER PLANTS

Abstract

The paper investigates methods of reducing the level of exchange oscillations of active power between generators in autonomous power plants. Studies prove that such oscillations lead to unstable operation of synchronous generators, reduce the economic efficiency of the power plant, provoke accelerated wear of system parts, and also become prerequisites for emergency situations and accidents. An analysis is conducted, indicating the advantages and disadvantages of common theoretical and practical methods. Methods related to increasing the inertial masses of units (flywheels of stationary and dynamic design), the use of damping devices, improving the generator excitation system, the use of massive damping windings, and increasing the static characteristic of generators are considered. It is proposed to use longitudinal-transverse excitation synchronous machines with an appropriate control system as a complex system that will eliminate exchange oscillations as generator units. Vector diagram of the longitudinal-transverse excitation generator is constructed. A brief description of the principle of measuring instantaneous active power based on a sensor on an analog integrated circuit for multiplying input voltages is given. The development of a control system for such a system based on an excitation regulator in the dq-axes of the inductor is identified as a promising direction of research. Longitudinal-transverse excitation generators with control units based on signals from instantaneous active power sensors will eliminate the influence of active power oscillations and improve the system for regulating the distribution of active power generation between units of autonomous power plants.