Synchronous reluctance machine controller
View Patent ↗The present invention provides an electro-mechanical energy exchange system with a variable speed synchronous reluctance motor-generator having an all-metal rotor. A bi-directional AC-to-DC electric power converter interconnects the motor-generator with a DC bus. First and second hybrid controllers provide current regulation for the motor-generator and voltage regulation for the DC bus. Use of both feedback and feedforward control elements provides a controller particularly suited for operating high speed devices.
1. An energy conversion system comprising:
a bi-directional AC-to-DC electric power converter;
the converter electrically interconnecting and bi-directionally exchanging electric power between a variable speed synchronous reluctance motor-generator and a DC bus;
the motor-generator bi-directionally exchanging mechanical power with a flywheel;
the power exchange being controlled by a plurality of current controllers;
the current controllers operably coupled to the converter;
the current controllers including a feedforward controller and a feedback controller;
a synchronous reluctance motor-generator machine dynamics predictor utilized by the feedforward controller; and,
wherein the predictor includes an input variable estimating an air-gap flux.
2. An energy conversion system comprising:
a bi-directional AC-to-DC electric power converter;
the converter electrically interconnecting and bi-directionally exchanging electric power between a variable speed synchronous reluctance motor-generator and a DC bus;
the motor-generator bi-directionally exchanging mechanical power with a flywheel;
the power exchange being controlled by at least one current controller operably connected to the converter;
a feedback controller operable for regulating the DC bus voltage;
the feedback controller incorporating a feedforward term for the DC bus current;
a synchronous reluctance motor-generator machine dynamics predictor utilized by the feedforward controller; and,
wherein the predictor includes an input variable estimating an air-gap flux.