VARIABLE-SPEED OPERATION CONTROL APPARATUS AND HYDROELECTRIC POWER GENERATION SYSTEM

摘要

According to one embodiment, there is provided a variable-speed operation control apparatus of a hydroelectric power generation system including a power generator (3) interconnected to a power system (P) through a main circuit (11) and a water turbine (4) directly connected to the power generator (3). The apparatus includes a branch circuit (12) branched from the main circuit (11) and including a frequency converter (5) which performs conversion between an output frequency of the power generator (3) and a system frequency of the power system (P), wherein the power generator (3) is interconnected to the power system (P) through the branch circuit (12) when a flow rate of water is less than a fixed level.