136results about "Generator control of frequency and voltage" patented technology

Disclosed herein are a variety of different electrical system topologies intended to mitigate the impact of large intermittent loads on a 12 volt vehicle power distribution system. In some embodiments the intermittent load is disconnected from the remainder of the system and the voltage supplied to this load is allowed to fluctuate. In other embodiments, the voltage to critical loads is regulated independently of the voltage supplied to the remainder of the system. The different topologies described can be grouped into three categories, each corresponding to a different solution technique. One approach is to regulate the voltage to the critical loads. A second approach is to isolate the intermittent load that causes the drop in system voltage. The third approach is to use a different type of alternator that has a faster response than the conventional Lundell wound field machine.

A controller (28) for a doubly fed induction generator (12,20) adjusts control signals to a rotor side converter (24) and line side converter (22) to adjust rotor current when a voltage transient on a utility grid (10) occurs, so that the doubly fed induction generator can ride through the transient. The controller can also turn off the transistors of the rotor side converter (24) to reduce rotor current and / or activate a crowbar (42) to reduce the voltage of the DC link (26) connecting the converters (22, 24) when significant voltage transients occur on the grid (10). This permits continued operation of the DFIG system without disconnecting from the grid.

The present invention relates to a method and to a device for adapting the alternating current generated by a generator (1) and the alternating voltage generated by a generator (1) to a grid (8), whereby the generator (1) has at least one excitation coil (2). The power fed into the grid (8) can be flexibly adapted while entailing low switching losses in that a static frequency converter (9) is employed for the adaptation between the generator (1) and the grid (8), and in that, in order to control the power fed into the grid (8), means (3) are provided with which, on the one hand, the strength of the excitation field generated by the at least one excitation coil (2) is regulated and, on the other hand, the phase angle between the frequency converter voltage and the generator or grid voltage is appropriately controlled.

A power generating system includes a high-frequency alternator, a rectifier, a capacitor in each phase line extending between an output terminal of the alternator and the rectifier, and an auxiliary power supply, providing auxiliary power for use within the power generating system, which is also connected to the output terminals of the alternator.

In a power generation apparatus equipped with an AC energization synchronous generator, when energization of a secondary winding starts to conduct connecting to the network of the AC energization synchronous generator to a network voltage, energization of the secondary winding starts at a fixed frequency and a slip frequency is calculated from a difference between a frequency of the network voltage and a resultant stator voltage frequency. Thereafter, energization starts at the calculated slip frequency and a voltage having a frequency generally coincident with the network frequency is output to the stator to incorporate the generator to the network. A phase is adjusted to make zero a phase difference when the rotation speed changes or the phases become different.

Vibrations at harmonic frequencies are reduced by injecting harmonic balancing signals into the armature of a linear motor / alternator coupled to a Stirling machine. The vibrations are sensed to provide a signal representing the mechanical vibrations. A harmonic balancing signal is generated for selected harmonics of the operating frequency by processing the sensed vibration signal with adaptive filter algorithms of adaptive filters for each harmonic. Reference inputs for each harmonic are applied to the adaptive filter algorithms at the frequency of the selected harmonic. The harmonic balancing signals for all of the harmonics are summed with a principal control signal. The harmonic balancing signals modify the principal electrical drive voltage and drive the motor / alternator with a drive voltage component in opposition to the vibration at each harmonic.

A generating device including a magneto generator, wherein: an AC control voltage is applied to an armature coil of the magneto generator from a battery via an inverter to change a phase angle of the AC control voltage, thus increase / reduce an output of the magneto generator and match the output of the generator with a target value; it is determined that a characteristic, in which the output of the magneto generator increases when the phase angle of the AC control voltage is delayed, is a normal control characteristic, and a characteristic, in which the output of the magneto generator decreases when the phase angle of the AC control voltage is delayed, is a reciprocal control characteristic; and it is determined whether a present control characteristic of the output of the generator relative to the phase angle of the AC control voltage is the normal control characteristic or the reciprocal control characteristic to decide, based on a determination result, a changing direction of the phase angle of the AC control voltage when the output of the generator is controlled and brought close to the target value.

A starter-generator system supplies a controllable torque to a gas turbine engine, to thereby assist in starting the gas turbine engine, by independently controlling excitation frequency and / or voltage magnitude. The starter-generator includes a multi-phase exciter stator, a rotationally mounted multi-phase exciter rotor, a multi-phase main stator, a rotationally mounted multi-phase main rotor, and an exciter controller. The rotationally mounted multi-phase exciter rotor has a plurality of exciter rotor windings wound thereon that, upon excitation thereof with a rotating electromagnetic exciter flux generated by the exciter stator, have non-rectified excitation currents induced therein. The rotationally mounted multi-phase main rotor has a plurality of main rotor windings wound thereon that are electrically connected to receive the non-rectified excitation currents induced in the exciter rotor windings and that, upon excitation thereof with a rotating electromagnetic flux and in response to the non-rectified excitation currents supplied thereto, have currents induced therein that generate a main rotor torque to thereby cause the multi-phase main rotor and the multi-phase exciter rotor to rotate. The exciter controller is electrically coupled to at least the exciter stator and is configured to selectively supply the electrical excitation thereto, to thereby selectively control the generated main rotor torque.

A rotating electrical machine, such as an aircraft starter-generator, that may be operated in either a DC motor mode or an AC generator mode. The machine includes a conventionally wound main stator that is selectively configurable as a multi-pole AC stator and a multi-pole DC stator. The machine also includes rotor windings that are configured to be selectively coupled to either an exciter or a plurality of commutator segments, and DC brushes that are selectively moveable into, and out of, electrical contact with the commutator segments, to thereby electrically couple and decouple a DC power source to and from, respectively, the rotor windings.

The invention relates to a structure of an excitation control system of a brushless doubly-fed shaft generator used for a marine diesel and a control method thereof. The structure comprises a contactor, a step-up transformer, a rectification feedback unit, a direct current compensation unit, a inverter unit, an operation panel, an excitation controller, an AB phase voltage sensor, a CA phase voltage sensor, and a BC phase voltage sensor; the method based on the control system structure can realize the excitation, constant-voltage control, constant-frequency control, under-voltage protection and over-voltage protection of the brushless doubly-fed shaft generator of the marine diesel.

The invention relates to a procedure of connecting a polyphased asynchronous generator on a polyphased alternating voltage network. The connecting is carried out by means of an adjustable, electronic connecting based on thyristors or similar variable (adjustable) connecting items, the connecting degree of which is varied during a controlled connecting course, which is controlled in consideration of the wish of a "soft" connecting on the network and a limitation of the maximum amperage during the connecting course. During the whole connecting course a continuous determination of the generator phase angle phi is carried out, and on basis of this determination a continuous adjustment of thyristors-the aperture angle is carried out, thus the aimed, successive load connection of the generator on the network (soft-connecting) is obtained. Furthermore the procedure include a new method to determine the generator phase angle phi by registering the time of zero circulation on the phase voltage, and at the same time detection of the respective thyristor voltage zero circulation point at a measuring method based on measuring of the thyristor voltage. The novelty of the invention consists in adjusting the ignition point of the thyristors successively to the phase angle phi, thus the connecting degree resulted to the thyristors is increased in a controlled speed regardless of the variations registered in the phase angle during the connecting course, i.e. in the principle the thyristor aperture angle is reduced, when phi increases and so on.

An electrical system and apparatus for a turbine / alternator comprising a gas driven turbine and a permanent magnet alternator rotating on a common shaft includes an inverter circuit connectable either to an output circuit or the stator winding of the alternator. A control circuit during a start-up mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the output circuit. The operating parameters of the turbine are monitored during start-up and / or the power out mode.

The invention provides a digital comprehensive regulation device for hydroelectric generating sets, and a control method thereof. The device comprises a controller, wherein the controller is respectively connected with a Hall current sensor, a Hall voltage sensor, a current conditioning circuit, a voltage conditioning circuit A and a voltage conditioning circuit B through analog input interfaces, and is respectively connected with a shaping circuit A, a shaping circuit B, a circuit-breaker auxiliary contact and a shaping circuit C through high-speed digital input interface; the controller is respectively connected with a pulse amplification circuit and a circuit breaker through high-speed digital output interfaces; and the controller is also respectively connected with a digital mixing module and an analog input module. The device can control and regulate the dynamic performances of generating sets by measuring and calculating the parameters of power networks and generators. The device integrates synchronization, speed regulation and excitation, has the characteristics of high control performance, short response time, programming easiness, debugging convenience, high execution speed and the like, and is particularly applicable to the comprehensive control over medium / small-size hydroelectric generating sets.

A power station comprises a power-consuming shaft run on which a motor and a compressor are arranged, as well as a power-emitting shaft run on which a generator and an expansion machine are arranged. The compressor feeds a compressed fluid into a storage volume. The compressed storage fluid is expanded in the expansion machine, producing work. The generator and the motor are connected to the electrical grid system via frequency converters. This makes it possible to operate the electrical machines at a rotation speed which is asynchronous with respect to the grid system. A method and apparatus is disclosed that allows the net power output of the power station to be matched to the demands of the electrical grid system by varying the rotation speed of at least one of the shaft runs.

A power station comprises a power-consuming shaft run on which a motor and a compressor are arranged, as well as a power-emitting shaft run on which a generator and an expansion machine are arranged. The compressor feeds a compressed fluid into a storage volume. The compressed storage fluid is expanded in the expansion machine, producing work. The generator and the motor are connected to the electrical grid system via frequency converters. This makes it possible to operate the electrical machines at a rotation speed which is asynchronous with respect to the grid system. A method and apparatus is disclosed that allows the net power output of the power station to be matched to the demands of the electrical grid system by varying the rotation speed of at least one of the shaft runs.

The invention consists of a ring motor, in which a first ring forms a toroidally wound stator and a second ring forms the rotor. A turbine is fixed to the rotor ring. The invention is specifically targeted towards the environment inside a gas turbine, in which hot gases may permeate the space between rotor and stator.

A method for controlling an inverter controlled generator set which comprises a DC power source section having as a power source a generator driven by an engine and an inverter which converts an output of said DC power source section into an AC output, the method comprising a step of controlling a rotational speed of the engine so that the AC output suitable for driving a load is output from the inverter; wherein, after the engine is started, the rotational speed of the engine is controlled by a constant speed control mode for maintaining the rotational speed of the engine at a set rotational speed, and the rotational speed of the engine is increased to the set rotational speed; and wherein an operation of the inverter is started after the rotational speed of the engine reaches the set rotational speed.

An output control device of a generation device including: a rectifier circuit that rectifies an output of an AC generator and applies the output across a battery; an inverter circuit provided between the battery and the generator; inverter control means for controlling the inverter circuit to convert a voltage across the battery into an AC control voltage and apply the voltage to an armature winding of the generator; and phase detection means for detecting a phase of a phase current flowing through the armature winding of the generator as a maximum output current phase, wherein the inverter control means is comprised to control a phase of the AC control voltage so as not to be delayed with respect to the maximum output current phase, and thus prevent a reduction in the output of the generator caused by an excessive delay of the phase of the AC control voltage.

A controller for controlling an actuator device which is installed on a vehicle and operated by a motor. The controller includes: a motor control portion operable to control the motor on the basis of a target value; and a target-value determining portion operable to determine the target value on the basis of a wave intensity characteristic. The wave intensity characteristic is represented by a relationship between (A) a propagated wave intensity indicative of an intensity of a wave which is generated as a result of activation of the actuator device and which is propagated to occupant of the vehicle, and (B) an output index indicative of an amount of an output of the motor. Also disclosed is a wave-intensity-characteristic obtainer for obtaining the wave intensity characteristic by measuring the intensity of the wave.

A rotating electrical machine, such as an aircraft starter-generator, that may be operated in either a motor mode or an generator mode. The machine includes a main rotor that is selectively configurable as an M-pole rotor or an N-pole rotor. The machine can also include DC brushes that are selectively moveable into, and out of, electrical contact the main rotor, to thereby electrically couple and decouple a DC power source to and from, respectively, the rotor windings.

A method in a frequency converter provided with a voltage intermediate circuit in connection with interference in a network (5) to be supplied and a frequency converter (2), which comprises a network converter part (4) and an inverter part (3) and a DC intermediate circuit (7) between them. The method comprises steps of controlling the intermediate circuit voltage at the beginning of network interference by limiting the torque on the inverter side, detecting interference in the network voltage, setting a torque reference to a predetermined value in response to the network interference, detecting network voltage recovery, and controlling the torque reference to a normal value in response to the network voltage recovery.

The present invention relates to a wind power plant, with at least one wind turbine generator, where each of the at least one wind turbine generator has a first voltage controller with a first bandwidth, arranged for controlling a voltage level, and where the wind power plant has a power plant controller with a second voltage controller with a second bandwidth also arranged for controlling the voltage level, the first bandwidth is larger than the second bandwidth. The invention also relates to a method for controlling the voltage level of a wind power plant, by using multi bandwidth voltage controllers.

The invention discloses a controller of a small wind-driven generator, and belongs to the technical field of controllers of clean energy. A small wind power generation power controller comprises the wind-driven generator, a rectifying module, a boosting step-down direct current (DC) / direct current (DC) convertor, a rotating speed detection module, an all-digital controller, a storage battery and a direct-current load. The small wind power generation power controller achieves a speed detection function by detecting a line voltage frequency of the wind-driven generator, and is low in cost, high in reliability, and free from an extra speed sensor which is added to the wind-driven generator, thereby being capable of accurately conducting tracking and controlling of a maximum power spot. The small wind power generation power controller utilizes a target power curve to calculate the maximum power spot, and is high in accuracy, fast in response, free from generating oscillation, and beneficial to improvement of generating efficiency of a system.

The invention discloses a maximum power point tracking method of a wind power generation system under the condition of a variable wind speed, and relates to the technical field of natural wind power generation automatic control. According to the method, when a draught fan is started or at the stage of a low wind speed, if output power of the draught fan is less than one half of rated power at the moment, a disturbance observation method is adopted; when the draught fan is at an operating stage and the wind speed becomes higher and rapidly changes, if the output power is higher than one half of the rated power and continues to rise at the moment, a particle swarm optimization algorithm is adopted; if the wind speed begins to reduce during operation, the output power of the draught fan is lower than one half of the rated power but still larger than a quarter of the rated power, the particle swarm optimization algorithm is still adopted until the output power is lower than a quarter of the rated power, and then the disturbance observation method is adopted. The method has the advantages that wind energy maximum power point tracking control can be well achieved, the tracking speed and the output power of the system are effectively improved, an output curve is relatively smooth, output vibration is reduced, and quality of electric energy is improved.

A method for the active damping of a drive train in wind energy plant, with the following steps: the actual value of the generator rotational speed is acquired and amplified via an oscillatory delay element, the oscillatory delay element has a predetermined natural oscillation frequency (ωE), which is smaller than the smallest natural frequency of the drive train, and a difference between the actual value of the rotational speed and the amplified value for the rotational speed is connected to a controller as actuating variable, which determines a correction moment for a generator control.

A generation device, having a magneto generator, in which an AC control voltage is applied from a battery charged with a rectified output of the magneto generator to an armature winding of the generator through an inverter to control a battery voltage to a limit value or less, comprising: fixed point detection means for detecting a fixed point on a waveform of a phase current of the generator; phase current phase detection means for detecting a phase angle of the fixed point in relation to a reference phase; arithmetical operation means for arithmetically operating timing for generating the AC control voltage with reference to the phase of the fixed point; and inverter control means for controlling switch elements of the inverter so as to generate the AC control voltage at the timing arithmetically operated by the arithmetical operation means.

The invention discloses an electric excitation double-salient pole motor loss-of-magnetic fault fault-tolerant power generation system and a control method thereof. The system is characterized in that two capacitors are introduced based on an original three-phase full-bridge topology to form a split capacitor type topology, moreover, the two capacitors further act as storage capacitors, before an excitation fault occurs, the power is generated in a traditional uncontrolled rectifier power generation mode through the three-phase full-bridge topology, after the excitation fault occurs, switching to a fault-tolerant power generation mode is performed to achieve fault-tolerant power generation through the split capacitor type topology. The system is advantaged in that the system realizes fault-tolerant power generation after the loss-of-magnetic fault of the electric excitation double-salient pole motor, improves the fault-tolerant capability of the system and is suitable for aerospace and other fields with high reliability requirements.

A hybrid voltage regulator controls the voltage of three phases of alternating electricity produced by an alternator. A digital voltage regulator produces an average of the RMS voltage for each phase and produces an error value based on a ratio of the voltage to the frequency of the alternating electricity. The RMS voltage average and the error value are used to modify a voltage command designating a desired voltage level. The modified voltage command is processed by an analog voltage regulator that rectifies the alternator output voltage which then is averaged over an period of time. The resultant average voltage value is utilized to modify the voltage command to produce a regulated voltage command that determines a level of current to apply to excite the alternator.