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1. (WO2005108749) A METHOD FOR SYNCHRONIZING AN INDUCTION GENERATOR OF AN ORC PLANT TO A GRID

Pub. No.:    WO/2005/108749    International Application No.:    PCT/US2005/016009
Publication Date: Nov 17, 2005 International Filing Date: May 6, 2005
IPC: F01K 13/02
F01K 25/08
Applicants: UNITED TECHNOLOGIES CORPORATION
COGSWELL, Frederick, James
KANG, Pengju
Inventors: COGSWELL, Frederick, James
KANG, Pengju
Title: A METHOD FOR SYNCHRONIZING AN INDUCTION GENERATOR OF AN ORC PLANT TO A GRID
Abstract:
The invention is a system and method for synchronizing an induction machine to an electrical grid (170). The embodiment described is an ORC power plant having a motor-generator (150) in mechanical communication with a turbine (140). The motor-generator (150) is operated with open windings (e.g., freewheeling) by driving the turbine with a variable speed pump (120) . The rotational speed of the motor-generator (150) is sensed. When the motor-generator (150) is operating at a rotational speed near the steady state rotational speed that corresponds to operation of the ORC power plant, the contacts between the motor-generator windings and the grid (170) are closed, and the motor is synchronized with the grid (170).