Synchronous machine starting device

摘要

In a synchronous machine starting device, a timing detection unit outputs a first position signal indicating a timing at which a value of an armature voltage passes a prescribed reference level. A feedback operation unit calculates an error of an estimated phase based on the estimated phase, an estimated rotational speed of a rotor, an armature voltage, and an armature current, updates the estimated phase and the estimated rotational speed based on the calculated phase error, and outputs a second position signal indicating the updated estimated phase. A frequency detection unit detects a current rotational speed of the rotor based on the first position signal, as an initial value of the estimated rotational speed. A selector circuit selects the first position signal and the second position signal in this order, and outputs a selected position signal to the power conversion control unit.

主权项

1. A synchronous machine starting device comprising:
a power conversion unit for converting supplied power into AC power and supplying the AC power to an armature of a synchronous machine; an AC voltage detection unit for detecting AC voltage supplied to or generated at the armature of said synchronous machine; an AC current detection unit for detecting AC current supplied to or generated at the armature of said synchronous machine; a rotor position detection unit for detecting a rotor position of said synchronous machine, based on said detected AC voltage and AC current; and a power conversion control portion for controlling said power conversion unit, based on said detected rotor position, said rotor position detection unit including: a timing detection unit for outputting a first position signal indicating a timing at which a value of said detected AC voltage passes a prescribed reference level; a feedback operation unit for calculating an error of an estimated phase based on said estimated phase indicating said rotor position, an estimated rotational speed of the rotor of said synchronous machine, as well as said detected AC voltage and AC current, updating said estimated phase and said estimated rotational speed based on said calculated phase error, and outputting a second position signal indicating said updated estimated phase; a frequency detection unit for detecting a first frequency corresponding to a rotational speed of the rotor of said synchronous machine at the time of starting of said synchronous machine starting device based on said first position signal, for use as an initial frequency corresponding to an initial value of said estimated rotational speed; and a selector circuit for selecting said first position signal or a position signal obtained based on said first position signal, outputting the selected signal to said power conversion control portion as a signal indicating the rotor position of said synchronous machine, releasing selection of said first position signal or the position signal obtained based on said first position signal, and thereafter selecting said second position signal for output to said power conversion control portion as a signal indicating the rotor position of said synchronous machine.