| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 322019000 | Antihunting or rate of change | 17 |
| 20080224671 | Electric power generation control apparatus for vehicle alternator - An electric power generation control apparatus for a vehicle alternator mounted on a motor vehicle performs one of a constant output voltage control a constant torque control and a constant exciting current control in order to suppress a hunting phenomenon of the vehicle alternator. First of all, the electric power generation control apparatus performs the constant output voltage control when a rotation speed is within an idling rotation speed range or a periodic change of the rotation speed is not less than a predetermined value. After completion of the constant output voltage control, when judging that the idle hunting phenomenon is not adequately suppressed, the electric power generation control apparatus performs one of the constant torque control and the constant exciting current control. | 09-18-2008 |
| 20090039838 | Device for controlling power generated in vehicle - A device for controlling vehicle power generation that controls duty cycle of an excitation winding in a vehicle power generator and controls an output voltage from the vehicle power generator to a predetermined value includes a power generation controlling circuit that, when the output voltage from the vehicle power generator is less than the predetermined value, gradually increases the value of a gradual excitation duty and gradually increases the excitation current, the gradual excitation duty being a limit value for increasing and decreasing an excitation drive duty intermittently controlling the electrification of the excitation winding, and in an opposite situation, gradually decreases a value of the excitation drive duty and gradually decreases the excitation current. The power generation controlling circuit changes the rate at which the value of the gradual excitation duty is decreased. | 02-12-2009 |
| 20090072797 | LOAD-OFF TRANSIENT ACCELERATION GENERATOR CONTROL SYSTEM - An electric generator is operated under conditions in which rapid off-loading may occur. A generator control unit (GCU) employs a detector to detect rates of change of output of the generator. In response to a rapid change of output, e.g. an off-loading, an overvoltage protection system is activated. Excess energy stored is an excited winding is directed into an impedance circuit thus precluding overvoltage that may have been produced by the excess energy. | 03-19-2009 |
| 20100225284 | VOLTAGE CONTROL APPARATUS FOR AUTOMOTIVE ELECTRIC GENERATOR - A voltage control apparatus for an electric generator includes a load response controller and a voltage response controller. The electric generator includes a field winding and is driven by an engine of a motor vehicle. When the output voltage of the generator decreases below a threshold voltage upon the application of an electrical load, the rotational speed of the engine fluctuates to repeatedly increase and decrease until it is stabilized. During the time periods in which the rotational speed of the engine decreases, field current supplied to the field winding of the generator is gradually increased under a load response control performed by the load response controller. During the time periods in which the rotational speed of the engine increases, the field current is gradually increased under a voltage response control by the voltage response controller. | 09-09-2010 |
| 20100289460 | ALTERNATOR CONTROLLING APPARATUS - Provided is an alternator controller that sets a target current value based on a target voltage as a control reference of an alternator mounted on a vehicle, and controls the alternator based on the set target current value. The alternator controller includes a filter processing unit that performs filter processing of a target power generation torque as a conversion physical amount used until the target current value is set from the target voltage. The filter processing unit performs a filter processing that attenuates or removes a frequency component f of the pitch resonance frequency of the vehicle among the waveforms of the target power generation torque. Thus, it is possible to surely suppress fluctuations of a vehicle behavior attributed to torque fluctuations of an alternator load torque. | 11-18-2010 |
| 20110074364 | CONTROL DEVICE FOR VEHICLE POWER CONVERTER - The control device detects the B-terminal voltage by a B-terminal voltage detection section. When an abnormal voltage detection section detects that a voltage value of the detected B-terminal voltage is equal to or higher than a predetermined voltage value, all switching elements of the negative pole-side arm in a power conversion section are brought into conduction by a negative pole-side arm short-circuiting section, whereas all switching elements of a positive pole-side arm are interrupted. In addition, a field current is limited to zero or to a limit value by a field current control section. | 03-31-2011 |
| 20110115444 | ELECTRIC LOAD DAMPER FOR DAMPING TORSIONAL OSCILLATION - An electric load damper assembly includes a synchronous generator operable to provide a plurality of phases of electrical output in response to a mechanical input from a rotating shaft. An electric load damper includes a phase leg for each of the plurality of phases. Each phase leg includes a resistive load, a snubber and at least one solid state switch. The at least one solid state switch is in parallel with the snubber, and the at least one solid state switch and snubber are collectively in series with the resistive load. A controller is operable to receive a signal indicative of a rotational speed oscillation of the synchronous generator, and is operable to selectively reduce a torsional oscillation of the shaft by diverting electrical current from the synchronous generator through the resistive load of each of the plurality of phases in response to the signal exceeding a predefined threshold. | 05-19-2011 |
| 20110309804 | CONTROL DEVICE OF WIND TURBINE GENERATOR AND CONTROL METHOD THEREOF - A control device of a wind turbine generator capable of controlling an active power based on an instruction value, includes a measurement means configured to measure a frequency of a utility grid. The instruction value for controlling the active power is generated to a direction suppressing a variation of the frequency of the utility grid based on conversion information which indicates a predetermined relation between the variation of the frequency and the instruction value when the variation of the frequency of the utility grid measured by the measurement means exceeds a predetermined standard. A wind turbine generator which controls suppression of a disturbance of a grid in its initial stage is realized. | 12-22-2011 |
| 20130009610 | CONTROL SYSTEM FOR DOUBLY-FED INDUCTION MACHINE - A method and arrangement for controlling a doubly-fed induction machine by a frequency converter including a rotor side converter (INU) connected to a rotor circuit of a doubly-fed induction machine (DFIG) and having a control system with rotor flux as a feedback variable, a grid side converter (ISU) connected to an AC power network, and a direct voltage intermediate circuit (DC) connected between the rotor side converter (INU) and the grid side converter (ISU). The method includes forming a rotor flux reference (ψ | 01-10-2013 |
| 20130320935 | METHOD FOR DAMPING TORSIONAL OSCILLATIONS IN A DRIVE TRAIN COMPONENT - A method for damping torsional oscillations in a drive train component, in particular a gearbox, in particular in a power production plant, includes adjusting a load on the output side in the drive train as a function of a difference between a rotational speed of an input shaft of the drive train component and a rotational speed of an output shaft of the drive train component. | 12-05-2013 |
| 20140103884 | RESONANT MODE DAMPING SYSTEM AND METHOD - A control system for increasing the damping of a resonant mode of a rotor drive train is provided. A control loop is introduced in parallel with the free turbine speed governing control loop. The control loop receives a feedback signal from the free turbine and rotor drive train, the feedback signal representative of the free turbine speed. The control loop extracts the resonant component from the feedback signal to generate a resonant signal containing the resonant component and estimates a derivative of the free turbine speed from the resonant signal. The control loop then outputs a request for damping the resonant mode on the basis of the derivative. A narrow-band reject filter is introduced in the free turbine speed governing loop to filter out the resonant component from the feedback signal, thereby ensuring that the free turbine speed governing loop does not interfere with the control loop. | 04-17-2014 |
| 20140320092 | Power Supply System of Marine Vessel - A power supply system configured to couple to a power distribution bus of a marine vessel and to power a plurality of electric motors coupled to the power distribution bus. The power supply system includes a generator configured to generate electric power and a control system coupled to the generator and configured to control the output voltage of the generator based on a voltage setpoint. The control system includes a measuring unit configured to measure a parameter of the electric power generated by the generator and a control unit configured to control the voltage setpoint for the output voltage of the generator based on the measured parameter. | 10-30-2014 |
| 20140340055 | METHOD AND SYSTEM FOR CONTROLLING A MOTOR VEHICLE ALTERNATOR, AND MOTOR VEHICLE ALTERNATOR INCLUDING SUCH A SYSTEM - A method for controlling a motor vehicle alternator, in which an error value, resulting from the comparison between the voltage produced by the alternator and a set value, is processed in a filtering means by applying a transfer function, which determines a gain to be associated with the error value on the basis of the rotational frequency of the alternator, in order to control the adjustment of the field current allowed by the alternator. The transfer function of the filtering means is modified on the basis of the rotational speed of the alternator by attenuating the gain over a given frequency range when the rotational speed decreases. | 11-20-2014 |
| 20140375281 | USING STATIC EXCITATION SYSTEM TO REDUCE THE AMPLITUDE OF TORSIONAL OSCILLATIONS DUE TO FLUCTUATING INDUSTRIAL LOADS - Controlling a shaft of a turbine generator, wherein the turbine generator includes a static excitation system and wherein the shaft is being driven in a first rotational direction at a predetermined speed. Controlling the shaft includes detecting a torsional oscillation of the shaft, calculating a control signal based on the torsional oscillation, and using the control signal, controlling an amount of power drawn by the static excitation system from the turbine generator. | 12-25-2014 |
| 20150326161 | CIRCUIT AND METHOD FOR FREQUENCY SYNTHESIS FOR SIGNAL DETECTION IN AUTOMATIC VOLTAGE REGULATION FOR SYNCHRONOUS GENERATORS - Automatic voltage regulation is shown involving full wave rectifying a power signal and generating a reference corresponding to an operating voltage level, line sampling the power signal and comparing it to the reference to generate a line sync signal synchronized to the power signal. Producing 90° out of phase signals synchronized to the line sync signal with a PLL locked onto the line sync signal that outputs a phase error signal. Generating a quadrature signal from the phase signals. Sampling the peaks of the rectified power signal using the quadrature signal to produce a control signal. Subtracting the error signal and damping signal from the reference to produce a duty cycle modulation signal. The duty cycle modulation signal controls a duty cycle of a field voltage control signal that oscillates at a predetermined frequency. The field voltage control signal is low-pass filtered to produce the damping signal. | 11-12-2015 |
| 20160141991 | POWER SYSTEM SUB-SYNCHRONOUS OSCILLATION DAMPER - A control circuit for power system sub-synchronous oscillation dampening is described. The control circuit is configured to provide low impedance at sub-synchronous frequencies and high impedance at the fundamental frequency. The control circuit includes an input configured to receive a direct voltage value and a quadrature voltage value. Both the direct voltage value and the quadrature voltage value are based on a three-phase voltage. At least one controller configured to determine a direct current value and a quadrature current value based at least in part on the direct voltage value and the quadrature voltage value is included. The control circuit also includes an output configured to send the direct current value and the quadrature current value as feed forward signals to a control loop for the three-phase voltage. | 05-19-2016 |
| 20160164444 | Method and System for Eliminating Low Frequency Oscillation Between Generators - A method and system for eliminating the low-frequency oscillation between generators. By way of measuring the absolute rotor angle of a generator and controlling the rotor rotational speed, the absolute rotor angles obtained through measurement are the same when each GPS pulse per second signal arrives. The absolute rotor angles are angles of the internal potential Eq of the generator leading a GPS reference vector. Through the absolute rotor angle, zero steady state error control of the frequency and the rotor angle is achieved and the position of the generator rotor can remain unchanged in the PPS determined rotating coordinate system, thus suppressing the low-frequency oscillation better even without the need of remote measurement and achieving automatic local balance of active power during variation of loads. Accordingly, the power fluctuation on transmission lines is decreased while safe and stable operation of a large-scale interconnected power grid is achieved. | 06-09-2016 |
