Power generation system using synchronous generator

A power generation system using a synchronous generator, a converter connected to a stator of said synchronous generator, a capacitor connected to an output side of said converter, and an inverter connected to said capacitor, wherein

• said inverter is connected to a power system via a transformer, and
• said converter includes a voltage detector for detecting a terminal voltage of the stator of said synchronous generator, a current detector for detecting a current flowing through the stator of said synchronous generator, and rotor position estimating means for estimating a rotor position of said synchronous generator from a voltage detected by said voltage detector and a current detected by said current detector, and wherein
• said rotor position estimating means calculates a d-axis component of a voltage induced in said synchronous generator in a d-q axis coordinate system determined by a rotor position during estimation and controls the d-axis component of said induced voltage to zero to estimate the rotor position, said rotor position estimating means includes an active power detector for detecting an active power of an output of said synchronous generator and a reactive power detector for detecting a reactive power of the output of said synchronous generator or a terminal voltage detector for detecting an effective value of the terminal voltage of the stator of said synchronous generator, said rotor position estimating means also includes a reactive power controller for controlling the active power of the output of said synchronous generator with use of the active power value detected by said active power detector and an active power controller for controlling the reactive power of the output of said synchronous generator or a terminal voltage controller for controlling the terminal voltage of said synchronous generator with use of the terminal voltage value detected by said terminal voltage detector, said active power controller adjusts a q-axis current command on the d-q axis coordinate system determined by said rotor position estimating means to control the active power of said synchronous generator, said reactive power controller or said terminal voltage controller adjusts a d-axis current command on the d-q axis coordinate system determined by said rotor position estimating means to control the reactive power or terminal voltage of said synchronous generator.