Optimization of Gas Engine Power Plant Operation Based on Study of Starting Conditions of a Powerful Motor Load

摘要

The issues of transient stability and other disturbances caused by direct and smooth (reduced-current) starts of powerful induction motors in autonomous electric power system that supplies to oil pumping station and has generators and gas engine units, which are commensurate with the load, are considered. Analysis to determine maximum power of induction motor during direct starts is performed. It is noted that direct start-up of powerful induction motors is accompanied with large currents, which in turn cause significant decrease of voltages on load buses. The options based on step change of voltage and smooth start using polynomial functions of speed are proposed. Algorithm has been developed to optimize soft start of motor, based on minimum electromagnetic torque, taking into account values of current limits and starting time.