1
Steven J Fredette, Rishi Grover: Quality power from induction generator feeding variable speed motors. UTC Power, M P Williams, May 2, 2006: US07038329 (11 worldwide citation)

A prime mover (28) in a heat recovery system drives an induction generator (8) which feeds power to a utility grid (9) through a breaker (10) but also powers a load including auxiliary induction motors (11, 12). To provide acceptable waveform and power factor, the auxiliary equipment is driven throu ...


2
Steven J Fredette, Wesley E Sedlacek Jr: Power system having AC and DC power sources. UTC Power Corporation, Stephen A Schneeberger, August 28, 2012: US08253273 (5 worldwide citation)

A power system (110; 210; 310) combines a power source (14) having a DC output (20A, 20B) with an AC supply from the AC grid (12) to provide AC to customer's loads (16) and DC to various DC auxiliary loads (134, 134A). The DC output of the DC power source (14) is connected in steady-state to the DC ...


3
David G Converse, Steven J Fredette: Electric storage augmentation of fuel cell system transient response. UTC Fuel Cells, M P Williams, August 8, 2006: US07087329 (3 worldwide citation)

A fuel cell stack (7) with output lines (8, 9) has a bank of supercapacitors (10) or batteries (10a) connected across the output lines, either directly or through a DC/DC converter (22). The fuel cell stack receives fuel either from a reformer (13) or a source (13a) of hydrogen. Power is supplied th ...


4
Steven J Fredette: Storage of fuel cell energy during startup and shutdown. UTC Fuel Cells, M P Williams, January 31, 2006: US06991864 (2 worldwide citation)

During startup or shutdown of a fuel cell power plant, the electric energy generated by consumption of reactants is extracted by a storage control (200) in response to a controller (185) as current applied to an energy storage system 201 (a battery). In a boost embodiment, an inductor (205) and a di ...


5
Steven J Fredette: Storage of fuel cell energy during startup and shutdown or other power transitions. UTC Power Corporation, M P Williams, September 7, 2010: US07790303 (1 worldwide citation)

During fuel cell startup and shutdown or other power reduction transitions of a fuel cell power plant, the excess electric energy generated by consumption of reactants is extracted by a storage control (200) in response to a controller (185) as current applied to an energy storage system 201 (a batt ...


6
Steven J Fredette: Storage of fuel cell energy during startup and shutdown or other power transitions. UTC Power Corporation, M P Williams, June 7, 2011: US07955746 (1 worldwide citation)

During fuel cell startup and shutdown or other power reduction transitions of a fuel cell power plant, the excess electric energy generated by consumption of reactants is extracted by a storage control (200) in response to a controller (185) as current applied to an energy storage system 201 (a batt ...


7
Steven J Fredette: State of charge calculator for multi-cell energy storage system having cell balancing. UTC Power Corporation, Stephen A Schneeberger, January 22, 2013: US08358136

An arrangement for monitoring the current or state of charge (SOC) of an energy system (230) having one or more series-connected strings (S1, S2, . . . Sn) of battery cells (C1, C2, . . . Cn). The battery cells each have respective dissipative devices (D1, D2, . . . Dn) selectively connectable in pa ...


8
Steven J Fredette, Rishi Grover: Harmonic filter with integrated power factor correction. United Technologies Corporation, Stephen A Schneeberger, March 5, 2013: US08390149

A distributed electrical power generating and utilizing system includes an induction generator driven by a prime mover requiring reactive power to operate for providing electrical power on a bus. The bus has a gross load and is also connectable to a utility power grid by a switch. The gross load inc ...


9
Steven J Fredette: Storage of fuel cell energy during startup and shutdown. M P Williams, March 24, 2005: US20050064258-A1

During startup or shutdown of a fuel cell power plant, the electric energy generated by consumption of reactants is extracted by a storage control (200) in response to a controller (185) as current applied to an energy storage system 201 (a battery). In a boost embodiment, an inductor (205) and a di ...


10
Steven J Fredette: Electric storage augmentation of fuel cell response to AC system transients. MP Williams, August 25, 2005: US20050184594-A1

A fuel cell power plant (9) provides DC power to an inverter (12) which provides power to three-phase power lines (16) which are connectable to a power grid (18) by switches (17), and which are connected to a critical customer load (30). An energy storage device (40) provides DC power to a bidirecti ...