Patent application number | Description | Published |
20090250943 | SYSTEMS AND METHODS INVOLVING OPERATING VARIABLE SPEED GENERATORS - A method for operating an asynchronous generator comprising receiving an indication that a power grid frequency is reduced. Responsive to the receiving the indication, reducing a speed of the asynchronous generator from a first speed to a second speed for a first time period, wherein the reduction of the speed of the asynchronous generator results in a momentary increase in a total power output of the asynchronous generator. Increasing the speed of the asynchronous generator from the second speed to a third speed responsive to the end of the first time period. | 10-08-2009 |
20090251109 | SYSTEMS AND METHODS INVOLVING STARTING VARIABLE SPEED GENERATORS - An exemplary method for starting a generator, the method comprising, starting a rotor with an AC voltage across the rotor. Starting a stator. Increasing a speed of the rotor. | 10-08-2009 |
20100141193 | TORSIONAL MODE DAMPING APPARATUS - A torsional-mode damping system includes a torque sensor, a torsional damper connected to the torque sensor, a VFD controller connected to the torsional damper, and a VFD converter connected to the VFD controller, the VFD converter being configured to control an electric power supplied to the electric motor based on VFD signals generated by the VFD controller, the VFD signals being modified by a torque-correcting signal so as to dampen torsional vibrations at a natural frequency of a compression train. | 06-10-2010 |
20100332045 | Regulation of Generating Plant - A method and system are disclosed that enable the regulation of the temperature of transmission equipment connected to a generating plant. In one embodiment, a method includes obtaining a temperature of transmission equipment connected to a generating plant and regulating the output of the generating plant in response to the temperature exceeding a threshold level to reduce the temperature of the transmission equipment to below the threshold level. | 12-30-2010 |
20110141641 | CIRCUIT BREAKER WITH OVERVOLTAGE PROTECTION - A circuit breaker is provided for protecting dynamoelectric machinery. The circuit breaker includes a feeder input connection connected to a feeder line. The feeder line is connected to a dynamoelectric machine. A substation connection is connected to a substation bus. An interrupting breaker is connected between the feeder input connection and the substation connection. A shorting switch is connected to the feeder input connection, and an impedance device is connected to the shorting switch and a ground or neutral. The impedance device, shorting switch and ground/neutral reduces excessive voltages on the feeder line when the feeder line is isolated from the substation by the circuit breaker, and the impedance device is selected to reduce a torque transient experienced by the dynamoelectric machine. | 06-16-2011 |
20120243129 | SHORTING PROTECTION FOR SYSTEMS HAVING ELECTRIC MACHINES - Shorting protection for systems having electric machines is provided. A protective device is put in shunt with an electric power system and an electric machine. The protective device is in an open state during normal operation and in a closed state in response to detection of a fault. In the closed state, the protective device forms a short circuit that isolates the electric power system from the electric machine. | 09-27-2012 |
20130079945 | METHOD AND SYSTEM FOR OPERATING A POWER GENERATION AND DELIVERY SYSTEM - A method for controlling operation of a power generation and delivery system while increasing a power output of the power generation and delivery system is described. The method includes, monitoring an output parameter of the power generation and delivery system and determining a rate of change of the output parameter as a function of time. A reactive current command signal is generated a as a function of the determined rate of change of the output parameter. Operation of a power converter is controlled based at least partially on the reactive current command signal to facilitate maintaining a substantially constant terminal voltage as the power output of the power generation and delivery system is increased. | 03-28-2013 |
20130270916 | SYSTEMS AND METHODS FOR LIMITING VOLTAGE ON AN AUXILIARY BUS - Systems and methods for limiting voltage on an auxiliary bus are described. The voltage-limited auxiliary bus may be comprised of a DC auxiliary bus comprised of a positive conductor and a negative conductor; a chopper, wherein the chopper is normally in a non-conducting state; a resistor in series with the chopper, wherein the chopper and the resistor are connected between the positive conductor and the negative conductor of the DC auxiliary bus; and a chopper control, wherein an overvoltage on the DC auxiliary bus causes the chopper control to cause the chopper to begin conducting and the conducting limits the voltage on the DC auxiliary bus and dissipates energy from the overvoltage. | 10-17-2013 |
20140043080 | METHODS AND SYSTEMS FOR CONTROLLING A POWER CONVERTER - A line angle shift logic controller for use with a power generation system coupled to an electrical grid is disclosed. The line angle shift controller includes a line angle shift controller configured to receive a phase locked loop (PLL) error signal representative of a difference between a phase angle of the power generation system and a phase angle of the electrical grid, receive a threshold phase from the electrical grid, and generate a PLL shift signal based at least partially on the PLL error signal and the threshold phase. | 02-13-2014 |
20140062424 | SYSTEM AND METHOD FOR CONTROLLING A DUAL-FED INDUCTION GENERATOR IN RESPONSE TO HIGH-VOLTAGE GRID EVENTS - In one aspect, a method for controlling a dual-fed induction generator (DFIG) during a high-voltage grid event is provided. The method includes setting, by a controller, an output of a closed-loop portion of a rotor current regulator to a fixed value such that a predictive feed-forward path sets an internal voltage for the DFIG; and detecting, by the controller, a condition of high dc voltage on a dc link or a condition predictive of high dc voltage on the dc link, and in response reduce a rotor torque producing current command to approximately zero, wherein the dc link connects a line-side converter connected to a system bus and a rotor-side converter connected to a rotor of the DFIG. | 03-06-2014 |
20140070535 | METHOD AND SYSTEMS FOR OPERATING A WIND TURBINE USING DYNAMIC BRAKING IN RESPONSE TO A GRID EVENT - A method and system for dissipating energy in a direct current (dc) bus of a doubly-fed induction generator (DFIG) converter during a grid event is described. In one aspect, the method comprises monitoring operating conditions of an electrical system, the electrical system comprising at least a DFIG generator and a line side converter and a rotor side converter connected by a dc bus having a dynamic brake connected thereto; detecting an overvoltage on the dc bus or a condition indicative of an overvoltage on the dc link is detected, the overvoltage on the dc bus or condition indicative of the overvoltage caused by a grid event; and causing energy in the dc link to be dissipated using the dynamic brake. | 03-13-2014 |
20140152010 | METHOD AND SYSTEMS FOR OPERATING A WIND TURBINE WHEN RECOVERING FROM A GRID CONTINGENCY EVENT - A method for controlling operation of a wind turbine included within a power generation and delivery system is described. The method includes receiving, by a controller, a power command signal, wherein the power command signal indicates recovery from the grid contingency event; and increasing, in a non-uniform manner, power injected into a grid by a power conversion assembly in response to the power command signal wherein the controller controls the power conversion assembly. | 06-05-2014 |