Asynchronous conversion method and apparatus for use with variable speed turbine hydroelectric generation
Patent 5742515 Issued on April 21, 1998. Estimated Expiration Date: 
October 31, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 31, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3471708 3694728 3701938 3836837 Energy transmission system with a common main for direct current Rotary electric machine and power conversion system using same Controllable electrical single-armature of rotary converter Rotary phase converter Method for controlling power flow between an electrochemical cell and a power grid Method for switching operation of water wheel or pump water wheel InventorsAssigneeApplicationNo. 550940 filed on 10/31/1995US Classes:700/287, Turbine or generator control290/40C, Control in response to generator and prime mover conditions290/52TURBOGENERATORSExaminersPrimary: Ramirez, Ellis B.Assistant: Stamber, Eric W. Attorney, Agent or FirmForeign Patent References
International ClassF01D 015/10AbstractA hydroelectric power generation system (20) generates electrical power for an electrical utilization system (72). A controller (42) obtains a requested output electrical power level from a hydro-turbine unit (70) by using a signal indicative of water head (hmeas) to control speed of an asynchronous rotary converter (50) coupled to the hydro-turbine unit and to control gate position of the hydro-turbine unit. The requested output electrical power level is applied from the hydro-turbine unit via the rotary converter to the electrical utilization system. In one embodiment, the controller (42B) accesses an updatable memory wherein Hydraulic Hill Chart information is stored. In another embodiment, the controller (42C) also includes a real-time automatic governor which uses a signal indicative of ac transmission frequency to the electrical utilization system to control the output electrical power level of the rotary converter.Other References
Field of SearchControl in response to generator and prime mover conditionsTURBOGENERATORS FLUID-CURRENT MOTORS Fluid pressure, density, level, velocity or humidity Speed, centrifugal or kinetic force Attainment of voltage, frequency or phase relationship Responsive to speed or rotation phase angle With controlled power conversion Condition responsive Fluid/granular material flow rate, pressure, or level METHOD OF OPERATION WITH CONTROL MEANS RESPONSIVE TO NON-CYCLIC CONDITION SENSING, CENTRIFUGAL ACTUATION OR TORQUE Responsive to liquid level or weight | |
