135results about "Generator control of frequency and voltage" patented technology

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.

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.

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.

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 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.