Yan Liu

US Patent:

6819087, Nov 16, 2004

Filed:

Dec 27, 2002

Appl. No.:

10/329684

Inventors:

Robert Delmerico - Clifton Park NY
Gautam Sinha - Clifton Park NY
Yan Liu - Schenectady NY

Assignee:

General Electric Company - Schenectady NY

International Classification:

H02P 910

US Classification:

322 58, 322 19, 322 23

Abstract:

A power electronic based DR (distributed resource e. g. , a UPS (uninterrupted power supply), Fuel Cell or Microturbine) is controlled to emulate a voltage source behind an impedance and behave as a power system stabilizer. The impedance in the DR is emulated and an estimate of impedance at the power/electronic interface is derived and applied to the control of the DR in a manner wherein the power and voltage swings on systems (loads) that otherwise would have difficulty with dynamic loads, are stabilized. Damping and synchronizing power are provided measuring only voltage, current and frequency at the interface between the DR and the load. The DR may include some energy storage.

US Patent:

7016793, Mar 21, 2006

Filed:

Oct 1, 2003

Appl. No.:

10/677559

Inventors:

Zhihong Ye - Clifton Park NY, US
Vinod John - Montpelier VT, US
Changyong Wang - Shanghai, CN
Luis Jose Garces - Schenectady NY, US
Rui Zhou - Clifton Park NY, US
Lei Li - Shanghai, CN
Reigh Allen Walling - Clifton Park NY, US
William James Premerlani - Scotia NY, US
Peter Claudius Sanza - Niskayuna NY, US
Yan Liu - Schenectady NY, US
Mark Edward Dame - Niskayuna NY, US

Assignee:

General Electric Company - Schenectady NY

International Classification:

G01R 21/00
H02J 1/00
H02M 7/00

US Classification:

702 60, 702 65, 290 40 B, 290 40 C, 307 30, 307 45, 318762, 318763, 318767, 361 60, 361 62, 363109, 363116, 363120, 700286, 700292

Abstract:

An apparatus for anti-islanding protection of a distributed generation with respect to a feeder connected to an electrical grid is disclosed. The apparatus includes a sensor adapted to generate a voltage signal representative of an output voltage and/or a current signal representative of an output current at the distributed generation, and a controller responsive to the signals from the sensor. The controller is productive of a control signal directed to the distributed generation to drive an operating characteristic of the distributed generation out of a nominal range in response to the electrical grid being disconnected from the feeder.

US Patent:

7180300, Feb 20, 2007

Filed:

Dec 10, 2004

Appl. No.:

11/009111

Inventors:

William James Premerlani - Scotia NY, US
Rui Zhou - Clifton Park NY, US
Yan Liu - Niskayuna NY, US
Gregory Paul Lavoie - Bristol CT, US
Marcelo Esteban Valdes - Burlington CT, US
Michael Gerard Pintar - Burlington IA, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

G01R 31/08
G01R 31/14
H02H 3/00

US Classification:

324512, 324509, 324527, 361 64

Abstract:

A method for locating a ground fault in an electrical power distribution system includes providing a plurality of current sensors at a plurality of locations in the electrical power distribution system. The method further includes detecting a ground fault in the electrical power distribution system. Current is monitored at a plurality of locations in the electrical power distribution system via the current sensors and a test signal is introduced into the electrical power distribution system via a test signal generating device. The plurality of locations are monitored to locate the ground fault between a location at which the test signal is detected and a downstream location at which the test signal is not detected.

US Patent:

7239035, Jul 3, 2007

Filed:

Nov 18, 2005

Appl. No.:

11/282378

Inventors:

Luis Jose Garces - Niskayuna NY, US
Yan Liu - Ballston lake NY, US
Sumit Bose - Niskayuna NY, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

F03B 17/00

US Classification:

290 43, 290 54, 60398

Abstract:

An integrated, wind-pumped hydro power generation system includes at least one wind turbine generator device configured to generate output power for a common bus, and at least one hydro generator device configured to generate output power for the common bus. The hydro generator device is powered by water flow. The wind turbine generator device and the hydro generator device include corresponding local controls associated therewith, and a set of supervisory controls is in communication with the common bus and each of the local controls.

US Patent:

7315769, Jan 1, 2008

Filed:

Oct 31, 2005

Appl. No.:

11/263420

Inventors:

Chellappa Balan - Niskayuna NY, US
Sumit Bose - Niskayuna NY, US
Zhihong Ye - Austin TX, US
Jovan Bebic - Clifton Park NY, US
Juan de Bedout - West Glenville NY, US
Yan Liu - Ballston Lake NY, US
Luis Garces - Niskayuna NY, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

G05D 17/00
H02J 3/38

US Classification:

700286, 700291

Abstract:

A plurality of power generating assets are connected to a power grid. The grid may, if desired, be a local grid or a utility grid. The power grid is connected to a plurality of loads. The loads may, if desired, be controllable and non-controllable. Distribution of the power to the loads is via a controller that has a program stored therein that optimizes the controllable loads and the power generating assets. The optimization process is via multi-tier benefit construct.

US Patent:

7378820, May 27, 2008

Filed:

Dec 19, 2005

Appl. No.:

11/311050

Inventors:

Yan Liu - Ballston NY, US
Luis Jose Garces - Niskayuna NY, US
Sumit Bose - Niskayuna NY, US
Jovan Bebic - Clifton Park NY, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

F03D 9/00
H02P 9/04
H02P 9/00
H02P 11/00

US Classification:

322 44, 290 55, 290 44, 322 37

Abstract:

An electrical power generation system and method for generating electrical power are provided. The electrical power generation system utilizes a master controller for controlling operation of devices coupled to an AC electrical grid and DC electrical grid based on parameter values associated with a renewable power generator.

US Patent:

7391126, Jun 24, 2008

Filed:

Jun 30, 2006

Appl. No.:

11/427883

Inventors:

Yan Liu - Ballston Lake NY, US
Luis Jose Garces - Niskayuna NY, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

H02P 9/00

US Classification:

290 44

Abstract:

Various embodiments relate to systems and methods related to an integrated electrically-powered sub-system and wind power system including a wind power source, an electrically-powered sub-system coupled to and at least partially powered by the wind power source, the electrically-powered sub-system being coupled to the wind power source through power converters, and a supervisory controller coupled to the wind power source and the electrically-powered sub-system to monitor and manage the integrated electrically-powered sub-system and wind power system.

US Patent:

7560906, Jul 14, 2009

Filed:

May 20, 2008

Appl. No.:

12/123535

Inventors:

Yan Liu - Ballston Lake NY, US
Luis Jose Garces - Niskayuna NY, US
Sumit Bose - Niskayuna NY, US
Jovan Bebic - Clifton Park NY, US

Assignee:

General Electric Company - Niskayuna NY

International Classification:

H02J 1/00
H02J 3/00
H02P 9/00

US Classification:

322 7, 322 44

Abstract:

An electrical power generation system and method for generating electrical power are provided. The electrical power generation system utilizes a master controller for controlling operation of devices coupled to an AC electrical grid and DC electrical grid based on parameter values associated with a renewable power generator.