152results about "Generation protection through control" patented technology

The invention relates to the technical field of new energy automobile generator performance detection, and discloses an automobile generator performance detection method and device. The method comprises the steps of collecting working condition data such as voltage, current, rotating speed and internal temperature of a generator in real time through a multi-source sensor, establishing a correlation model among the voltage, the current, the rotating speed and the internal temperature based on a regression analysis method, and dynamically adjusting safety thresholds of the voltage and the current according to the model. Compared with the prior art that monitoring depends on a fixed threshold value, especially under complex working conditions such as high load, rapid acceleration and high temperature conditions, the technical problem that working condition changes cannot be adapted in real time is solved, real-time monitoring is achieved by dynamically adjusting the voltage and current threshold values and combining the rotating speed and the internal temperature change rate, and the real-time monitoring efficiency is improved. The stable operation of the generator under the multi-dimensional working condition is ensured, so that the problem of equipment damage caused by overload is avoided, the safety of the system is improved, and the service life of the system is prolonged.

The invention discloses a generator field loss protection impedance circle checking method and related equipment, and belongs to the technical field of field loss protection, working parameters of a generator, a main transformer and a power system are simply obtained, after the parameters are obtained, the system automatically checks the field loss protection impedance circle, convenience and rapidness are achieved, different types of units are selected, and the working efficiency is improved. The system can adapt to different impedance circle calculation methods of a thermal power generating unit, a hydroelectric generating unit and the like, the intersection area of a 100% equal active impedance circle and an asynchronous boundary impedance circle and the intersection area of a static stability limit impedance circle on an impedance plane are calculated respectively, a comparison algorithm is set, and calculation results are given. And the suitability of a system calculation model is greatly expanded.

Systems and methods are provided for braking a translator of a linear multiphase electromagnetic machine. The system detects a fault event. A polarity indicative of an electromotive force in determined in at least one phase of the linear multiphase electromagnetic machine caused by a motion of the translator. In response to detecting the fault event, the system causes, based on the polarity, a current to be applied to a respective phase of the at least one phase to cause a force acting on the translator that opposes an axial motion of the translator to cause the translator to brake. Braking includes causing the translator to reciprocate at a reduced velocity by opposing axial motion over one or more cycles. The system may use one or more of position information, current information, operating parameters, to brake, or may brake the translator independent of such information.

A gas turbine generator system configured to be electrically interconnected to an electrical grid via a first circuit breaker. The gas turbine generator system includes a compressor configured to output a pressurized gas flow to an electrically heated thermal energy storage system which outputs a heated and pressurized gas flow to a gas turbine to cause the gas turbine to rotate and drive an electrical generator. The electrical generator outputs electric power to the electrical grid via the first circuit breaker, operating in a normally closed position. There is a controller to detect an opening of the first circuit breaker and to close a first switch, in response to the opening of the first circuit breaker. The first switch is connected to the output of the electrical generator and to the electrical input of the electrically heated thermal energy storage system, connecting the generator to the thermal energy storage system.

The invention discloses an excitation carbon brush and collecting ring digital monitoring operation and maintenance system, method and device and a medium, and belongs to the technical field of power equipment monitoring, and the method comprises the steps: obtaining the real-time current data of a plurality of carbon brushes, and determining the deviation degree of each carbon brush current relative to a reference current; according to the generator operation condition parameters, determining a deviation threshold value used for judging carbon brush current abnormity; when it is detected that the current deviation degree of the target carbon brush exceeds a deviation threshold value, an adjustment control signal is generated; and responding to the adjustment control signal, performing mechanical stimulation operation on the target carbon brush, and changing the contact state of the target carbon brush and the collector ring. Automatic balance adjustment of the current of the carbon brush is realized through mechanical stimulation operation, and the service life of the carbon brush is prolonged.

An aircraft includes an internal combustion engine and an electrical power system. The electrical power system includes a permanent magnet machine and an inverter coupled to the permanent magnet machine. The permanent magnet machine includes a stator and a rotor configured to rotate relative to the stator.

A power converter system includes an asynchronous induction generator electrically coupled to an inverter / converter / controller (ICC). The ICC is coupleable to an electrical load. The ICC can include an AC-DC converter and a DC-DC converter. The DC-DC converter is configured to operate at a duty cycle substantially equal to 1 in a first operating mode. In the event of a short-circuit fault in the electrical load, the DC-DC converter is configured to operate at a duty cycle less than 1 in a second operating mode.

The invention provides a wind turbine generator power dynamic control method and device, electronic equipment and a storage medium, and relates to the technical field of wind turbine generators, and the method comprises the steps: obtaining target operation data of a wind power plant unit, and carrying out the preprocessing of the target operation data, the target operation data comprises a generator temperature value and a converter temperature value; according to the target operation data and a preset temperature threshold value, whether limited power is triggered or not is judged; if the limited power is triggered, determining a limited power value; and performing fault protection on the wind power plant unit according to the limited power value and the power fault threshold value. A flexible power control mode is adopted, a power value is dynamically controlled based on the temperature of a large component, and compared with a traditional fixed value or table look-up power reduction control strategy, the temperature level of the large components of a generator and a converter can be more accurately controlled.

The present invention provides a method for estimating the subtransient reactance of a surface-mounted permanent magnet motor based on the finite element method, which relates to the technical field of motors. The method includes constructing a finite element model, setting the rotor angular frequency, and calculating the back electromotive force amplitude and synchronous reactance under specific working conditions; performing at least two groups of parameter settings on the model, short-circuiting the three-phase winding circuit, and calculating the three-phase short-circuit current waveform; for the three-phase short-circuit current waveforms under different groups of parameters, selecting a specific phase to calculate the waveform difference; performing a spectral analysis on the waveform difference, and calculating the subtransient reactance parameter under the initial rotor position condition according to the relevant parameters of specific spectral components, the back electromotive force amplitude, and the synchronous reactance; changing the initial rotor position, and taking the average value of the subtransient reactance parameters at multiple positions as the final result. The present invention considers the influence of rotor eddy currents, and based on the finite element method, accurately and efficiently estimates the subtransient reactance through multi-step calculations and parameter adjustments, helping to optimize the power system.

The invention relates to an aircraft turbine engine comprising at least one propeller shaft and an electric machine (1), the rotor (3) of which is rigidly connected to the propeller shaft, the electric machine (1) comprising at least three power channels (C1-C4), a control device (4) designed to determine a control parameter for each power channel (C1-C4) as a function of a control command (Com), and a correction device (5) designed to correct the control parameter for each power channel (C1-C4) as a function of the control command (Com). And a correction device (5) designed to correct a precession movement of the rotor (3) relative to the stator (2), the correction device (5) being designed to determine a control command (Com) of the control device (4) as a function of the setpoint command (Comcons) and the precession level (NP), the control command (Com) being designed to generate a total magnetic force (FG) in the opposite direction to the precession movement (P +) of the rotor (3) in order to achieve damping of the precession movement.

The present invention relates to a short-circuit current control system (0) for an electrical network (3), comprising a power converter (2) controlled by a control system (4) and configured to rectify and regulate the voltage of the electrical machine (1). The control system (4) comprises: a synchronization unit (41); a control unit (42): - in active short-circuit mode, - in "freewheeling" mode, - by asynchronous pulse-width modulation; a regulation unit (43); such that, in the event of a short circuit, the control system (4) commands the power converter (2) to deliver to the electrical network (3) a direct current equal to the predetermined value. Figure for the abstract: Fig. 1

The invention discloses a method for correcting a V-shaped characteristic curve of a large generator, and belongs to the technical field of large generators. The problem that in the prior art, a V-shaped characteristic curve generated in a traditional testing experiment has a large offset error is solved. The method comprises the following steps: acquiring original data obtained in a V-shaped characteristic test process; carrying out a no-load characteristic test on the generator to obtain a test result of stator voltage and exciting current, and drawing a no-load characteristic curve; according to the deviation value of the rated stator voltage, the deviation value of the excitation current is obtained through auxiliary solving of the no-load characteristic curve; and correcting the stator current and the exciting current by taking the rated stator voltage as a reference to obtain the corrected stator current and the corrected exciting current, and drawing a corrected V-shaped characteristic curve under each load. The method effectively solves the problem of deviation of an original test V-shaped characteristic curve, and can be applied to calibration of a reference curve for generator operation.

Disclosed are a system and method for protecting a generator set from magnetic pole slip. The system may include a generator, a prime mover, and a controller. The generator includes a stator and a rotor. The prime mover is configured to drive the rotor to rotate. The controller may be configured to: determine a mechanical state of the generator based on data related to translational displacement of the rotor; determine an electrical state of the generator based on (a) a load angle or (b) a load angle and a rate of change of the load angle associated with rotation of the rotor in the stator; determine an operating state of the generator based on a fusion of the mechanical state and the electrical state; if the operating state is a magnetic pole slip warning, activate an output member to display or issue a warning; and if the operating state is a magnetic pole slip, activate a protective action.

A power generation system includes a rotating machine having a mechanical rotational output. An electrical generator is connected to the mechanical rotational output, and has an electrical output electrically connected to a power distribution system. A generator control unit is controllably coupled to at least the electrical generator. The generator control unit includes a memory and a processor. The generator control unit is configured to operate in conjunction with an overvoltage protection unit including a redundant overvoltage operational test system. The redundant overvoltage operational test system includes an operational amplifier configured to operate as a voltage follower during a first mode of operations, and as a point of regulation gain amplifier during a redundant overvoltage operational test.

The invention relates to a power converter and a system for an engine starter generator. A power converter system includes an asynchronous induction generator electrically coupled to an inverter / converter / controller (ICC). The ICC may be coupled to an electrical load. The ICC may include an AC-DC converter and a DC-DC converter. The DC-DC converter is configured to operate at a duty cycle substantially equal to 1 in a first mode of operation. In the event of a short-circuit fault in the electrical load, the DC-DC converter is configured to operate at a duty cycle of less than 1 in the second mode of operation.

A power generation system includes a rotating machine having a mechanical rotational output. An electrical generator (30) is connected to the mechanical rotational output, and has an electrical output electrically connected to a power distribution system. A generator control unit (40) is controllably coupled to at least the electrical generator (30). The generator control unit (40) includes a memory and a processor. The generator control unit (40) is configured to operate in conjunction with an overvoltage protection unit including a redundant overvoltage operational test system. The redundant overvoltage operational test system includes an operational amplifier configured to operate as a voltage follower during a first mode of operations, and as a point of regulation gain amplifier during a redundant overvoltage operational test.

A distributed multi-phase generator includes a plurality of generator subsystems, with each generator subsystem including a respective processor and rotor. The plurality of generator subsystems is configured to generate a combined voltage output that is in one of a plurality of different phases. The plurality of generator subsystems are configured to communicate operating parameters to each other, and in some embodiments, can control another generator subsystem or compensate for changes in operation of another generator subsystem (including faults). As part of dynamic generator operation, each generator subsystem can adjust its field angle modulation scheme based on feedback received from other generator subsystems as well as its own operation.

A power generation device (1) includes: a power generator (10), a power conversion circuit (21), a first interruption circuit (23), a second interruption circuit (24), a first monitoring circuit (25) which monitors an output current flowing from the power generator (10) to the power conversion circuit (21) and outputs a first interruption signal when an absolute value of the output current exceeds a first predetermined value, and a second monitoring circuit (26) which monitors a total value of output voltages of respective phases of the power generator (10) and outputs a second interruption signal when an absolute value of the total value exceeds a second predetermined value. A first interruption circuit (23) electrically interrupts a connection between the power generator (10) and the power conversion circuit (21) in accordance with the output of the first or second interruption signal, and the second interruption circuit (24) electrically interrupts the connection between the three-phase coils (Lu, Lv, Lw) and the neutral point (N) in accordance with the output of the first or second interruption signal.

A motor device prevents electrolytic corrosion of a bearing. The motor device is mounted on a vehicle and has a stator installed in a housing and provided with a concentrated winding coil, a rotor housed in the center of the stator and provided with a permanent magnet, a bearing installed in the housing and supporting a rotating shaft of the rotor, an inverter provided between the stator and a power storage body and controlling an energization state of the concentrated winding coil, and an energization control section that outputs a control signal to the inverter and executes field weakening control that generates a magnetic flux of the concentrated winding coil in a direction to weaken a magnetic flux of the permanent magnet. The energization control section executes the field weakening control to make a potential difference between the housing and the rotating shaft, i.e., shaft voltage Va1, lower than a withstand voltage Vb1 of the bearing when a motor revolution number Nm is greater than a threshold value Nx.

A power converter system (101) includes an asynchronous induction generator (102) electrically coupled to an inverter / converter / controller (ICC (104)). The ICC (104) is coupleable to an electrical load (110). The ICC (104) can include an AC-DC converter (106) and a DC-DC converter (120). The DC-DC converter (120) is configured to operate at a duty cycle substantially equal to 1 in a first operating mode. In the event of a short-circuit fault in the electrical load (110), the DC-DC converter (120) is configured to operate at a duty cycle less than 1 in a second operating mode.

The present invention relates to a system (0) for controlling the short-circuit current of an electrical network (3) comprising a power converter (2) controlled by a control system (4) and configured to rectify and regulate the voltage of the electric machine (1), the control system (4) comprising: - a synchronization unit (41); - a control unit (42) for controlling: - in an active short-circuit mode, - in free-wheeling mode, - by asynchronous pulse width modulation, - a regulation unit (43); such that, in the event of a short circuit, the control system (4) controls the power converter (2) in order to deliver to the electrical network (3) a direct current equal to the predetermined value.

The invention relates to a method for controlling a power generating unit. The method includes determining a virtual impedance value (Zvir), determining a virtual grid power (Pvsm) based on the virtual resistance value (Rvir) and the grid current (Igrid), determining a virtual synchronous machine rotational speed (ωVSM) and / or a synchronous machine angle (θVSM) of a virtual synchronous generator, and determining a voltage reference (Vabc) for controlling a line side converter to generate the desired reactive power (Qgrid) based on the virtual synchronous machine rotational speed or angle (ωVSM, θVSM), a virtual voltage (ΔVαβ, ΔVdq) and the voltage magnitude reference (Vqref).

System (100), comprising: a generator (105) having a field winding (110) configured to generate a magnetic field in response to receiving a field excitation current, and a generator terminal (115) configured to generate an output voltage that is a function of the field excitation current applied to the field winding (110); a generator step-up transformer (120) connected to the generator terminal (115) of the generator (105) and configured to adapt the output voltage generated by the generator terminal (115) for connection to an electricity distribution network, the generator step-up transformer (120) operating at a maximum selection of taps; an excitation system (135) configured to supply the field excitation current to the field winding (110) of the generator (105); and an excitation system compensator (145) configured to regulate the field excitation current supplied by the excitation system (135) to the generator (105), wherein the regulated field excitation current causes a change in the output voltage at the generator terminal (115) as a function of the reactive power generated by the generator (105) to reduce the fault current contribution from the generator to the electricity distribution network.

A power generation device (1) includes: a power generator (10), a power conversion circuit (21), a first interruption circuit (23), a second interruption circuit (24), a first monitoring circuit (25) which monitors an output current flowing from the power generator (10) to the power conversion circuit (21) and outputs a first interruption signal when an absolute value of the output current exceeds a first predetermined value, and a second monitoring circuit (26) which monitors a total value of output voltages of respective phases of the power generator (10) and outputs a second interruption signal when an absolute value of the total value exceeds a second predetermined value. A first interruption circuit (23) electrically interrupts a connection between the power generator (10) and the power conversion circuit (21) in accordance with the output of the first or second interruption signal, and the second interruption circuit (24) electrically interrupts the connection between the three-phase coils (Lu, Lv, Lw) and the neutral point (N) in accordance with the output of the first or second interruption signal.

The present invention belongs to the technical field of motor system control, and specifically relates to a slip control system of a high-power pulse generator set and a control method thereof. The slip control system comprises: a 2500kw motor, a slip device, a main monitoring PC, a PLC master station and a slip control cabinet and a plurality of slip control devices arranged in the slip control cabinet. The present invention realizes high-parameter and high-precision slip starting mode control, can meet the technical requirements of frequent starting of a high-power pulse generator set and interlocking control of multiple slip control devices, can meet the safety of the unit starting and stably accelerate according to a given current.

The present invention pertains to a method for detecting an onset of a pole slip in a generator as well as a corresponding control unit and generator, in particular to predict a pole slip prior to an actual occurrence of a pole slip in order to enable required safety measures. Accordingly, a method for detecting an onset of a pole slip in a generator is suggested, comprising the steps of detecting subsequent zero cross points (20; 110) from a voltage measurement received from said generator and determining a voltage phase by interpolating said zero cross points (20; 120). The voltage measurement is received from an auxiliary winding (12; 100) of the rotor (10) that is electrically isolated from the main windings (14) of the rotor (10), wherein a relative rotor angle is determined (16; 130) based on the determined voltage phase of the auxiliary winding (12) and a relative voltage phase change of the main windings (14; 125). A signal is output, when a relative rotor angle change is determined that exceeds a predefined angle change threshold (18; 140).

The invention discloses a generator rectifying device which comprises a rectifying device and a generator, the rectifying device comprises a rectifying module, a centrifugal fan and a shaft connector, the centrifugal fan comprises an impeller, an impeller shaft, a first end plate and a second end plate, and the first end plate and the second end plate are connected through a plurality of supporting columns to form a centrifugal fan shell. The impeller is coaxially installed between the first end plate and the second end plate, the impeller shaft is coaxially and integrally arranged on the side, close to the first end plate, of the impeller, and the end, away from the impeller, of the impeller shaft penetrates through the first end plate and is coaxially connected with a generator rotor rotating shaft through a shaft connector. The two rectification modules are installed on the side, away from the first end plate, of the second end plate of the centrifugal fan in a mirroring mode, and when a rotor of the generator rotates, the centrifugal fan conducts heat dissipation on the generator and the rectification modules at the same time. The centrifugal fan is arranged on the rectifier module, so that the aim of performing air-cooling heat dissipation on the rectifier module and the generator at the same time is fulfilled.

An aircraft turbine engine including at least a propulsion shaft and an electric motor. A rotor is rigidly connected to the propulsion shaft. The electric motor includes at least three power channels, a control device designed to determine a control parameter for each power channel on the basis of a control command, and a correction device designed to correct a precession movement of the rotor relative to the stator. The correction device being designed to determine the control command of the control device from a setpoint command and a precession level. The control command being designed to generate a global magnetic force opposing the precession movement of the rotor so as to damp said movement.

The invention discloses a double-fed wind turbine generator network-related performance optimization method adaptive to high-power fault impact. The method comprises the following steps: step 1, constructing a multi-sequence domain model of a double-fed wind turbine generator under high-power fault impact; 2, constructing a double-layer optimization model taking the minimum de-excitation time constant as an upper layer and the minimum voltage unbalance degree as a lower layer; and step 3, solving the multi-sequence-domain model based on the double-layer optimization model to obtain rotor de-excitation and positive and negative sequence current instructions. According to the method, rotor multi-sequence domain finger current instructions can be coordinated on the premise that stress constraint is met, the unbalanced voltage suppression capability of the doubly-fed fan is remarkably improved while rapid de-excitation is considered, and a reference is provided for improving the grid-related performance of the doubly-fed fan.

A safety module for an inverter of a motor vehicle. The inverter including at least two power circuits. The safety module including a control unit and at least two safety switches, each safety switch being associated with a power circuit and being connected between the power circuit and a point referred to as the “measurement” point. The control unit being capable of controlling each safety switch and being configured to detect a closing malfunction of a safety switch if: a) a closing command has been sent to the safety switch, the other safety switches being open, b) and the voltage at the measurement point is negative.