Abstract: A method is described for detecting a malfunction stage of an electric machine including a rotor, a stator and a rectifier circuit connected to the stator. A temporal progress of a voltage value of the electric machine is recorded. An evaluation value is determined from the recorded temporal progress of the voltage value. The determined evaluation value is compared to a reference value, and it being evaluated as a function of a result of this comparison whether or not a malfunction state of the electric machine is present.

Abstract: An in-vehicle power control system includes a first load control unit and a power control device. In the power control device, switch units respectively switch the second conductive paths between an electrically connected state and a not-electrically connected state. A second load control unit predetermines types of switch units, and, if the second load control unit has received, from the first load control unit, a power reduction instruction in which a control method is designated by type, controls the switch units for each type thereof based on the control methods designated by type by the power reduction instruction.

Abstract: A method for charging an energy storage element of a vehicle using a charging apparatus which provides a charging current (IL) and a charging voltage (U) at an operating point. The charging apparatus has a plurality of energy supply modules connected in parallel, having the following method steps: in an optimization step, a distribution of the charging current (IL) to the energy supply modules connected in parallel, in the case of which the charging apparatus has a maximum overall efficiency, is respectively determined for a plurality of predefined operating points; in a charging step which follows the optimization step, a distribution of the charging current (IL) to the individual energy supply modules of the charging apparatus, in the case of which the charging apparatus has a maximum overall efficiency, is selected on the basis of a predefined charging current (IL) and a predefined charging voltage (U).

Abstract: The invention relates to a method and to a safety circuit for safe limiting of consumption of electrical power in an electrical component of a field device. The consumption of the electrical power is controlled by separating the input path from a superordinated unit by the safety circuit according to a predetermined clocking, wherein the clocking is controlled by a control signal. In the case of no control signal, the power limiting is assured by separating the input path from the superordinated unit. In the case of a defective control signal, the power is limited by the safety circuit to a maximum power. Due to this type of control, the operating temperature of the electrical component remains always below a critical temperature. The field device may thus be used in explosion-endangered regions.

Abstract: A propulsion system for an unmanned underwater vehicle includes a turbine engine, a generator mechanically coupled to an output shaft of the turbine engine, an electrical motor mechanically decoupled from the turbine engine and electrically coupled to the generator via a power bus architecture, and a propulsor mechanically coupled to a rotational output of the electrical motor. The power bus architecture includes a pair of AC buses and a DC bus.

Abstract: The disclosed embodiments aim to improve upon existing multi stage generators for providing power to a load. In particular, embodiments of the invention include a regulator situated between the output of a pilot exciter and the main exciter of a multi stage generator system, the regulator arranged to limit the voltage available to a field current control element which sets the field current supplied to the main exciter.

Abstract: An in-vehicle system includes a power supply box provided in a vehicle, and having a plurality of device connectors and a controller that supplies, to the plurality of device connectors, power received from a power supply, and a switch that switches between a cut off and a permission of power supplied to the plurality of device connectors in the power supply box. When power supplied to the device connectors is permitted by the switch, the controller performs a connection target validation process of identifying a type of a connection target device connected to each of the device connectors and a position of the device connector to which the connection target device is connected.

Abstract: A fault ride-through circuit with a variable frequency transformer (VFT) and a control method thereof are provided, and the control method comprises: pretreating acquired voltages of grids, a voltage of a stator interface and a voltage of a rotor interface to obtain a rotor voltage DC component and a rotor voltage DC component; testing and treating a voltage frequency of a first grid and a voltage frequency of a second grid; carrying out a reference voltage calculation for a stator voltage DC component, a rotor voltage DC component, the voltage frequencies of the first grid and the second grid to obtain a positive voltage reference value of the first PWM convertor and the second PWM convertor; and processing the voltage reference values to obtain the switch signals for controlling the first PWM convertor and the second PWM convertor.

Abstract: A system may include an independent speed variable frequency (ISVF) generator and an excitation source configured to provide an excitation signal to rotor field windings of the ISVF generator to produce a rotating magnetic flux that is independent of a shaft speed of the ISVF generator. The system may include a bus configured to receive an output voltage of the ISVF generator. A generator control unit may be configured to generate a first excitation voltage reference component based on a shaft frequency of the ISVF generator, generate a second excitation voltage reference component based on a difference between a reference voltage and a measured output voltage of the ISVF generator, and generate an excitation voltage control signal based on a combination of the first excitation voltage reference component and the second excitation voltage reference component, the excitation voltage control signal usable to control a voltage magnitude of the excitation signal.

Abstract: A controllable voltage-generating apparatus includes a mechanically driven, separately excited generator. An electric output voltage of the generator is rectified by a rectifier. The voltage-generating apparatus can be controlled by a control system. A voltage-control device of the control system has a calculation device, by way of which an electric excitation signal for the generator can be calculated by way of a defined interpolation from measurement values of the electric excitation signals of the voltage-generating apparatus.

Abstract: A synchronous machine (100) has a frame (110), a shaft (115), a main section (120), and an exciter section (125). The main section (120) has a stator winding (130) which is mounted on the frame, and a rotor winding (135) which is mounted on the shaft. The exciter section has a transformer (140) and a rectifier (145). The transformer has a primary winding (140A) mounted on the frame and a secondary winding (140B) mounted on the shaft. The rectifier is mounted on the shaft and rectifies an output of the secondary winding to provide a rectified output to the rotor. A control unit (170) provides a high-frequency control signal to the primary winding. This signal is magnetically coupled to the secondary winding, rectified, and then applied to the rotor to control the operation of the synchronous machine.

Abstract: A system includes one or more synchronous generators and one or more corresponding exciters. The exciter is configured to output a field current for exciting the synchronous generator to produce a voltage and a current at an output of the synchronous generator. The system may also include one or more electric motors electrically coupled to the synchronous generator and configured to drive one or more mechanical loads. A controller included in the system is configured to identify power angle oscillations between the voltage and the current and control an exciter voltage of the exciter to damp the identified power angle oscillations.

Abstract: Disclosed is a method for controlling an alternator of a vehicle that can change a Pulse Width Modulation (PWM) duty cycle change rate to reach a target PWM duty cycle after completion of an initial engine stabilization. According to the method, PWM duty cycle is increased using an initial rate received from an ECU to prevent an engine overload from occurring when a current PWM duty cycle is less than a predetermined reference duty cycle. When the current PWM duty cycle becomes higher than the predetermined reference duty cycle, PWM duty cycle change rate can be adjusted to flexibly suppress engine RPM fluctuation and vibration in real time and to improve a response speed of an alternator output voltage.

Abstract: A monitoring system for an electric power-assisted steering system comprising a DC power supply; an inverter bridge including a plurality of bridge switches selectively connecting phases of a multi-phase electric motor to the DC power supply, the multi-phase electric motor being configured to provide power-assistance to a steering system of a vehicle; a bridge driver circuit for providing control signals to the inverter bridge; and a DC link capacitor circuit interposed between the DC power supply and the inverter bridge, the DC link capacitor circuit at least one DC link capacitor. The monitoring system comprises a monitoring circuit configured to monitor the integrity of the DC link capacitor circuit, and outputting a ripple value indicative of a ripple voltage in an output of the DC power supply; and comparison means for comparing the ripple value with at least one ripple parameter indicative of a fault in the DC link capacitor circuit and determining whether a fault is present.

Abstract: A first optimal CPU frequency that produces minimal power consumption for a CPU/platform combination may be calculated by using an Efficiency Aware Race to Halt (EARtH) algorithm, which ignores the power efficiency curve of the voltage regulator (VR). These results may then be modified by applying the power efficiency curve of the associated VR to determine a second optimal CPU frequency that produces power consumption that is less than the value calculated by the EARtH algorithm.

Abstract: A voltage drop compensation control system and method of a power supply device are provided. The voltage drop compensation control system of the power supply device, for compensating for a voltage drop generated in an electric connection line between a direct current (DC)-DC converter and a battery includes a controller that generates a compensation voltage command that is obtained by compensating for an output voltage command of the DC-DC converter by applying a first control value for compensating for the voltage drop to the output voltage command. The controller also determines the first control value, based on an error between the compensation voltage command or an output voltage detection value of the DC-DC converter and a voltage of the battery.

Abstract: A system stabilization system (101) is provided with: at least one of a power flow state database (DB2) and a system configuration database (DB3); a device state database (DB1) in which the device states of a stabilizing device are recorded; a stabilizing effect index calculation function (204) for indexing the stabilizing effect of the stabilizing device on the basis of a device state and one or both of a power flow state and a system configuration; and a display means for displaying or outputting a stabilizing effect index obtained by the stabilizing effect index calculation function, in contrast with contrasted elements included in the device state, the power flow state, and the system configuration.

Abstract: A system includes one or more synchronous generators and one or more corresponding exciters. The exciter is configured to output a field current for exciting the synchronous generator to produce a voltage and a current at an output of the synchronous generator. The system may also include one or more electric motors electrically coupled to the synchronous generator and configured to drive one or more mechanical loads. A controller included in the system is configured to identify power angle oscillations between the voltage and the current and control an exciter voltage of the exciter to damp the identified power angle oscillations.

Abstract: A drive train comprising an electric machine including a rotor and a stator, the stator being electrically connected to an alternating grid and having a stator frequency, and a bidirectional system for converting an alternating current into another alternating current. The conversion system is connected between the grid and the rotor, and comprises an ac/dc converter connected to the network, and an inverter connected between the ac/dc converter and the rotor, the inverter and the rotor being interconnected at an intermediate point for each phase of the alternating voltage. The drive train comprises a band-stop filter for a target interval of between 0.6 times the stator frequency and 1.4 times the stator frequency, said band-stop filter being connected between the intermediate points and attenuating the voltage at the intermediate point for the frequencies of the target interval.

Abstract: In one embodiment, an automatic voltage regulator includes a detection instruction unit configured to monitor a generator output voltage, and output an instruction signal when the output voltage of the generator 12 deviates from a predetermined range, the instruction signal being a signal of instructing detection of a specifying parameters generated in a generator field circuit of a generator excitation system; a field-parameter detection unit configured to detect the specifying parameters following to the instruction signal; and a comparison calculator configured to calculate a comparison value between the specifying parameters and a predetermined allowable upper-limit voltage-value of each component constituting the generator excitation system.

Abstract: A synchronized laser system for illuminating a sample with first and second laser light pulses, said system comprising: a trigger, said trigger being operative to issue first and second trigger signals, said first and second trigger signals being emitted at an adjustable frequency with a predetermined delay therebetween; a first tunable mode-locked laser operative for emitting said first laser light pulses in response to receiving a train of said first trigger signals, a first wavelength of said first laser light pulses being dependent on said adjustable frequency in accordance with a first wavelength-frequency relationship; a second tunable mode-locked laser operative for emitting said second laser light pulses in response to receiving a train of said second trigger signals, a second wavelength of said second laser light pulses being dependent on said adjustable frequency in accordance with a second wavelength-frequency relationship; wherein said predetermined delay is such that said first and second laser l

Abstract: Systems and methods for managing appliance power consumption. In one embodiment, an appliance can include a plurality of microcontrollers. Each of the microcontrollers can be associated with at least one appliance component. The appliance can further include one or more low power management microcontrollers. The low power management microcontrollers can be configured to monitor a state of each of the microcontrollers. The low power management microcontrollers can be further configured to determine that one or more of the microcontrollers of the plurality of microcontrollers are in an inactive state. The low power management microcontrollers can be configured to send one or more command signals to place the one or more microcontrollers in the inactive state in a lower power mode based at least in part on the determination that the microcontroller is in the inactive state. The respective microcontroller can consume less power in the lower power mode than while in an active state.

Abstract: An integrated welding system is described that includes an engine-driven power supply, control circuitry for regulating power from the power supply and for delivering power suitable for welding, and a wire feeder driven by the generated power for delivering a continuous feed of wire electrode. The system is suitable for MIG and flux core welding applications, and may further include an optional gas supply for a shielding gas. Other power is available in the system, such as for running conventional 120V and 240V power tools, lights and so forth. The unit may also be operated from an external power source, typically the power grid. The unit may be designed to permit selective operation in accordance with constant voltage and constant current regimes for MIG, TIG and stick welding.

Abstract: A battery-driven electronic device includes a battery for outputting a battery voltage, a plurality of loads, a system unit, and a battery energy manager which is electrically connected with the battery, the loads and the system unit. The battery energy manager is adapted for detecting the battery voltage and set with a cutoff threshold, and a low-voltage threshold higher than the cutoff threshold. When the battery voltage is equal to or lower than the low-voltage threshold, the battery energy manager stops supplying power from the battery to at least one of the loads, and outputs a suspension command for the system unit to perform suspension process. When the battery voltage is equal to or lower than the cutoff threshold, the battery energy manager stops supplying power to the loads and the system unit.

Abstract: A system for allocating power generation between a constant speed generator set and a variable speed generator set. A controller determines an operating power demand from on-line consumers, and determines an anticipated transient power demand from a new consumer or one with an increasing power demand. The controller allocates the electrical power response between the generator sets to meet both the operating power demand prior to a transient condition and the total power demand upon the occurrence of the transient condition. The allocation may be based upon operating modes of the system.

Abstract: 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.

Abstract: A voltage detection circuit includes: a transistor; a switch coupled to a drain terminal of the transistor; the drain terminal is coupled to an one end of the switch; a first driver that controls the switch in synchronization with a second driver that drives a gate terminal of the transistor; and a plurality of resistors coupled in series and coupled to an another end of the switch.

Abstract: The excitation circuit according to the invention controls an excitation current (lexc) in an excitation winding (2) of an alternator by means of an on-board network voltage control loop (Vbat+, 3) of the vehicle, and comprises a first MOS power transistor (9) which is connected between a first positive supply terminal Vbat+ (6), and a first excitation terminal (7), and is controlled by the control loop by means of a first control circuit (10), a second MOS power transistor (11), which is connected between the first excitation terminal and a second excitation terminal (8) which is connected to a ground terminal (5) and acts as a free wheel diode, whilst being controlled by means of a second control circuit (12). According to the invention, the circuit additionally comprises a control loop (15) of a drain-source voltage (Vds) of the second transistor.

Abstract: A three phase regulator rectifier for automotive battery charging applications of a two wheeled vehicle having a few discrete components and providing programmable feedback control for improved efficiency in battery charging applications.

Abstract: A welding system includes an engine-driven welder generator that produces welding power. A welding torch receives the welding power and applies it to a stick electrode to initiate and maintain a welding arc. A parameter of the welding power, such as voltage, is monitored, such as to determine whether spikes occur during a short time after arc initiation. Based upon the monitored parameter, the engine speed is controlled. The engine speed may be increased or maintained at an elevated level if the monitored parameter indicates that particular types of electrode are being used, such as XX10 or cellulose electrodes.

Abstract: A voltage regulator includes: a difference amplifier with first input terminal connected to a reference voltage; a first transistor having a first terminal connected to a supply voltage, a control terminal connected to the output terminal of the difference amplifier, and a second terminal configured to supply a regulated voltage to a load; a feedback circuit connected to the second terminal of the first transistor and configured to supply a feedback voltage to a second input terminal of the difference amplifier; and a current compensator configured to draw a compensation current from the first transistor when a load current supplied by the first transistor to the load is less than a threshold current, thereby increasing the first current through the first transistor, and configured to draw substantially no compensation current from the first transistor when the load current is greater than or equal to the threshold current.

Abstract: A power distribution system is described that does not rely on a fixed frequency and which therefore allows prime movers to run at different speeds in response to load demand, typically so that fuel consumption and/or harmful exhaust emissions is/are minimised. A marine power distribution and propulsion system can include an ac busbar adapted to carry a variable-frequency ac distribution voltage. A plurality of ac generators are connected to the busbar, each having an associated prime mover such as a diesel engine, turbine etc. A power management controller is adapted to vary the rotational speed of the prime movers with reference to the electrical load on the ac busbar such that the generators provide a variable frequency output during normal operation of the power distribution system. Such operation is to be contrasted with conventional distribution systems which have a fixed frequency.

Abstract: An engine-driven welder generator is controlled based upon power draw for welding and other applications. Once a welding arc is initiated, the power draw is monitored. The engine speed, and therefore the power output of the generator, may be increased or maintained based upon the power draw. The power draw may include both welding power draw and auxiliary power draw. The engine speed is increased in increments. The initial engine speed and subsequent increments may depend upon particular welding processes or regimes.

Abstract: A system includes an excitation system. The excitation system includes a memory configured to store an adaptive power system stabilizer (PSS) system configured to dynamically stabilize the operation of a generator system, and a processor communicatively coupled to the memory and configured to utilize the adaptive PSS system according to a value for one or more operational parameters of the generator system. The derived value is applied by the processor to operate the generator system when the generator system exhibits oscillations at least one of a plurality of operating frequency ranges associated with an oscillation of a power angle of the generator system. The derived value is configured to attenuate the oscillation of the power angle over the at least one of the plurality of interval operating frequency ranges.

Abstract: The present invention relates to a method for controlled shutdown of wind turbines. The method involves using a generator side converter, and optionally a DC chopper, as a generator load during controlled shutdown. In this way gearbox back-lashing and drive train oscillations can be avoided. The present invention also relates to a wind turbine capable of performing controlled shutdown in accordance with the before-mentioned method.

Abstract: A brushless field exciter for wound synchronous machines that uses the resonance of the leakage inductance and a capacitor in a resonant field exciter to transfer energy to the rotating field winding. By resonating at frequencies greater than 50 kHz, this exciter reduces the overall size and weight of synchronous wound field motors at all power levels and extends the practical and economic power limits of synchronous wound field machines down to low integral and fractional HP applications, eliminating the permanent magnets now used in high efficiency motors and generators in that power range.

Abstract: A brushless field exciter for wound synchronous machines that uses the resonance of the leakage inductance and a capacitor in a resonant field exciter to transfer energy to the rotating field winding. By resonating at frequencies greater than 50 kHz, this exciter reduces the overall size and weight of synchronous wound field motors at all power levels and extends the practical and economic power limits of synchronous wound field machines down to low integral and fractional HP applications, eliminating the permanent magnets now used in high efficiency motors and generators in that power range.

Abstract: Systems, methods, and a voltage regulator are provided for tuning reactive droop compensation of a generator in a parallel power generation system. The voltage regulator is configured to compute a simulated droop compensation voltage for the generator and control an excitation signal to the generator based at least in part on the simulated droop compensation voltage.

Abstract: A system includes an n-phase separately excited electrical machine, wherein n?1, and a controllable first energy store that has n parallel energy supply branches. Every energy supply branch includes a first connection that is connected to a respective phase connection of the electrical machine, and a second connection that is connected to a common reference bus. The reference bus is connected to a neutral point of the electrical machine via an exciter winding of the electrical machine.

Abstract: A vehicle AC generator control apparatus, the rotor of an vehicle AC generator 1 of which is coupled through a torque transfer member with the output axle of an internal combustion engine mounted in a vehicle, is provided with a magnetic-field current control system that can control the value c of a magnetic-field current flowing in a magnetic-field winding 3 of the vehicle AC generator 1 so that the magnetic-field current value c coincides with a magnetic-field current command value b; it is made possible to make the rotation torque of the vehicle AC generator 1 depend only on the rotation speed and to stabilize control of the internal combustion engine.

Abstract: An on-vehicle power generation control unit includes current detecting unit; communication unit; holding unit; maximum current determining unit; and current control unit. The current detecting unit detects the excitation current at the field winding. The communication unit communicates with an external equipment to receive a first upper limit. The holding unit holds a second upper limit. The maximum current determining unit determines a maximum current to be the second upper limit when the first upper limit has not received by the communication unit or when the received first upper limit is more than or equal to the second upper limit. Further, the maximum current determining unit determines the maximum current value to be the first upper limit when the received first upper limit is less than the second upper limit. The current control unit controls the detected excitation current to be within the maximum current value.

Abstract: The invention relates to a method for operating a thermal power plant, which includes a gas turbine and a generator driven directly by the gas turbine by means of a shaft and being connected to an electrical grid having a grid frequency (FG) via an electronic decoupling apparatus and a step-up transformer. A synthetic inertia response is achieved by said method includes the steps of: sensing said grid frequency (FG); detecting if in case of an excursion of said grid frequency (FG) additional inertial power is required or not; if inertial power is required, calculating the magnitude and duration of the additional inertial power; and releasing additional inertial power to said electrical grid in accordance with said calculations via said electronic decoupling apparatus.

Abstract: An engine-driven welder generator is controlled based upon power draw for welding and other applications. Once a welding arc is initiated, the power draw is monitored. The engine speed, and therefore the power output of the generator, may be increased or maintained based upon the power draw. The power draw may include both welding power draw and auxiliary power draw. The engine speed is increased in increments. The initial engine speed and subsequent increments may depend upon particular welding processes or regimes.

Abstract: A current sensor includes input modules each including an amplifier having a first input coupled to a respective winding of a regulator; a transistor having a control input coupled to the amplifier output, a first terminal coupled to a second input of the operational amplifier, and a second terminal configured to provide a sense current representing an unbalance of a phase current with respect to an average current of a winding; a current generator configured to bias the transistor; and an output resistor coupling the first terminal to an intermediate node. An output stage includes an output amplifier having a first input coupled to the intermediate node, and an output transistor having a control terminal coupled to the output amplifier output, a first terminal coupled to a second input of the output amplifier, and a second terminal providing another sense current representing a total current of the regulator.

Abstract: Various embodiments of the invention include systems, computer program products, and related methods for managing the purging of a hydrogen-cooled dynamoelectric machine. In various embodiments, a system is disclosed including at least one computing device configured to perform the following: obtain an indication of a fault in an alternating current (AC) power supply to a hydrogen-cooled dynamoelectric machine system; determine a reserve power characteristic of a reserve energy storage device in response to obtaining the indication of the fault in the AC power supply; and extend a pre-purge cycle for the hydrogen-cooled dynamoelectric machine system based upon the reserve power characteristic of the reserve energy storage device.

Abstract: A distributed electrical power system includes a first AC generator configured for supplying an AC voltage; a second AC generator configured for supplying the AC electrical voltage; an AC power distribution network connected to the first AC generator and the second AC generator for receiving the AC voltage, the AC power distribution network including a two or four-wire AC power distribution circuit; at least one (solid state circuit breaker (SSCB) module remotely located for receiving the AC voltage from the power distribution network; a system controller connected to a data bus for controlling operation of the at least one power distribution module; and at least one contactor for selectively switching supply of the AC voltage to the at least one power distribution module from either the first AC generator or the second AC generator upon failure of either of the first AC generator or the second AC generator.

Abstract: A welding system includes an engine-driven welder generator that produces welding power. A welding torch receives the welding power and applies it to a stick electrode to initiate and maintain a welding arc. A parameter of the welding power, such as voltage, is monitored, such as to determine whether spikes occur during a short time after arc initiation. Based upon the monitored parameter, the engine speed is controlled. The engine speed may be increased or maintained at an elevated level if the monitored parameter indicates that particular types of electrode are being used, such as XX10 or cellulose electrodes.

Abstract: A method for adjusting the power output of a wind turbine (10) based on component operating temperatures is disclosed. The method may generally include receiving a signal associated with an operating temperature of the wind turbine (402), determining a desired power output range of the wind turbine at the operating temperature (404), comparing a power output of the wind turbine to the desired power output range (406) and adjusting the power output when the power output is outside the desired power output range (408).

Abstract: A system for and method of for detecting a non-functional battery back-up unit (BBU) of an optical network terminal is presented. The system and method may include receiving power outage data associated with a plurality of customer sites, receiving, from each of the plurality of customer sites, discharge time data associated with a battery via a network, calculating a mean discharge time based on the discharge time data, comparing the discharge time data associated with each battery to the mean discharge time, determining that each battery that is associated with discharge time data that indicates a discharge time value that is less than the mean discharge time is faulty, and outputting a data signal that indicates that a battery is faulty.

Abstract: A generator includes a stationary portion and a rotating portion. The stationary portion includes a main armature winding and the rotating portion includes a main field winding a main field rotating power converter that selectively controls current supplied to the main field winding.