DEVELOPMENT AND APPLICATION OF THE ADJUSTABLE LOAD SHARING COEFFICIENTS METHOD FOR LOAD SHARING CONTROL BETWEEN PARALLEL OPERATING GENERATORS IN ISOLATED POWER GENERATION SYSTEMS

An isolated hydroelectric power-generating system of 400 V/50 Hz is studied. The system is built using hydroelectric units equipped with regulated hydraulic turbines and induction generators, a power electronic AC/DC voltage converter, a dump load and a bank of compensating capacitors. The stator windings of the generators in the system under consideration were connected in parallel. The power electronic converter, implemented on fully controlled semiconductor switches, performs the functions of a static synchronous compensator and an active rectifier in the system. A new method for frequency, voltage and load sharing control between generators is proposed. Based on the proposed method, frequency, voltage and load sharing controllers for the discussed system are developed. The converter control is implemented using stator voltage oriented vector control technique and space-vector pulse-width modulation of stator voltage. Verification of the proposed method for frequency, voltage and load sharing control between generators is carried out using the developed dynamic simulation model of the system under consideration. The obtained simulation results were analyzed and further research directions were formulated. Bibl. 23, Fig. 3, Table.