39results about "Generation protection through control" patented technology

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 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.

The invention provides a control method for reactive power output of a converter, which comprises the following steps: an online generator set outputs reactive power according to a target reactive power value of power grid dispatching, if the temperature of the online generator set exceeds a first temperature value, an offline generator set outputs reactive power and shares reactive power demand, and if the temperature of the online generator set does not exceed the first temperature value, the offline generator set outputs reactive power and shares reactive power demand; and when the target reactive power demand value of the on-line unit is greater than the reactive power threshold of the machine-side converter, the grid-side converter of the on-line unit outputs reactive power and bears part of the reactive power demand, so that the load of the machine-side converter can be reduced while the reactive power demand of power grid dispatching is met, and the reactive power generation capability of the converter is improved.

A method for operating a multi-stage bridge power converter in an electrical power system includes connecting multiple phases of the power converter to a common terminal on the DC side of the power converter to effectively make the multiple phases equal at a common potential. The method may further include fault monitoring of multiple devices of the power converter via a controller. Upon detecting a fault in one or more of the multiple devices, the method includes activating one or more protective devices of the power converter via the controller to prevent further faults in the remaining devices by diverting energy from the remaining devices.

The invention discloses a generator torsional vibration protection action control method and system based on fuzzy control, and relates to the technical field of generator torsional vibration protection. Respectively inputting the torsional vibration sensing signal into a judgment path with fuzzy reasoning capability and a judgment path adopting a fixed threshold value criterion, synchronously carrying out data processing on the two judgment paths, and recording a historical input value and a corresponding judgment result in an operation period to form a data structure for state inheritance; in a continuous judgment period, results of the two judgment paths are compared and analyzed through logic criteria, if a switching triggering condition is met, master control logic switching is executed between the two judgment paths, and a signal value and a judgment state stored in an original master control path are converted into an initialization input state required by a new path; and introducing a preset time sequence delay processing and nonlinear function transition processing process, and carrying out time slow change adjustment on the action amplitude.

A switching arrangement (30) for arc quenching in a wind turbine (1), the wind turbine (1) having a generator (11) and a machine-side converter (12). The switching arrangement (30) comprises a set of switches (34) electrically coupled to power lines (13) of a connection (13) between the generator (11) and the machine-side converter (12). At least one power line (36, 38) of the connection (13) is permanently connected to multiple switches (34) of the switching arrangement (30).

A method for detecting an electrical fault in a stator of an electrical machine, wherein the stator comprises a plurality of sets of windings, wherein each set of windings is assigned to a respective phase of the electrical machine, the method comprising the steps of determining a respective current: first, between a subset of one of the sets of windings and a different further subset of the same set of windings, and / or second, between a subset of one of the sets of windings and a neutral point, and / or third, between the neutral point and a further neutral point or at least a common neutral point connected to the neutral point and the further neutral point, evaluating a fault condition, wherein a fulfillment of the fault condition depends on the respective determined current, and outputting a fault signal to a person and / or a device when the fault condition is fulfilled.

A voltage regulator for a generator having a dynamic voltage-to-frequency (V / F) ratio includes a memory, a voltage calculator, and a selection module. The memory is configured to store a plurality of voltage-to-frequency curves for the generator. The voltage calculator is configured to receive data indicative of an output of the generator and to determine a resistance value from the output of the generator and to determine a voltage value from the output of the generator. The selection module is configured to select a voltage-to-frequency curve from the plurality of voltage-to-frequency curves responsive to the resistance value and to select a voltage-to-frequency ratio from the selected voltage-to-frequency curve responsive to the voltage value. An output regulation for the generator is determined responsive to the selected voltage-to-frequency ratio.

The invention relates to a system (0) for controlling a 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 a voltage of an 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 a freewheeling mode,-by asynchronous pulse width modulation,-a regulation unit (43); in the event of a short circuit, the control system (4) controls the power converter (2) in order to supply a direct current equal to a predetermined value to the electrical network (3).

The invention discloses a fault distinguishing method of a generator and a protection device, and aims to solve the technical problem that it is difficult to accurately distinguish a voltage measurement loop fault and a bus system fault in the prior art. The fault distinguishing method comprises the steps that when it is judged that at least two paths of generator terminal voltage signals have faults, stator current characteristics of a generator are obtained, and whether the fault type is a voltage signal collection fault or a bus fault is judged based on whether a stator current absolute value in the stator current characteristics is abnormal or not. The protection device provided by the invention comprises corresponding function modules for executing the method. By introducing the stator current characteristics for judgment, the fault source can be accurately discriminated, and the protection system misoperation caused by the measurement loop fault is effectively prevented, so that the stability and the safety of the operation of the generator set are improved.

The application relates to a permanent magnet synchronous generator power generation voltage stabilization control strategy considering high-resistance contact faults, and steps are as follows: based on a dq rotating coordinate system, a permanent magnet synchronous generator mathematical model considering high-resistance contact faults is established; combined with the permanent magnet synchronous generator mathematical model considering high-resistance contact faults, an instantaneous power equation considering high-resistance contact faults is derived based on instantaneous power theory; combined with the instantaneous power equation considering high-resistance contact faults, a quantitative relationship between a direct-current terminal voltage double-frequency ripple and a cross-axis current is derived based on a small signal analysis method; combined with the quantitative relationship between the direct-current terminal voltage double-frequency ripple and the cross-axis current, a cross-axis current integral average compensation method is designed by taking the characteristic that a sine signal is integrated to zero in an integral period, and a compensated current is obtained to perform permanent magnet synchronous generator power generation voltage stabilization control. The application can inhibit the double-frequency ripple of the cross-axis current, and further reduce the double-frequency ripple of the direct-current terminal voltage, so that the purpose of voltage stabilization control is achieved.

The invention relates to a protection method and system for shutdown of a medium-voltage generator based on reverse power, and the method comprises the steps: collecting three-phase voltage and current signals of the medium-voltage generator, and carrying out the preprocessing of the three-phase voltage and current signals; calculating real-time power based on the preprocessed three-phase voltage and current signals; judging whether the current medium-voltage generator generates reverse power or not based on a reverse power generation judgment rule and the real-time power, if so, calculating a reverse power quantized value, and comparing the reverse power quantized value with a reverse power grading threshold value to obtain a reverse power grade; executing corresponding shutdown protection measures of the medium-voltage generator based on the reverse power level; wherein the reverse power grading threshold value is optimized through reinforcement learning. The method is high in response speed, high in control precision, high in adaptability and suitable for safety protection requirements of the medium-voltage generator in multiple scenes.

A zero dynamic attack defense method for an automatic voltage regulator comprises the following steps: (1) system initialization and parameter configuration of the automatic voltage regulator; (2) candidate controller loading: configuring multiple groups of controller parameters capable of independently stabilizing the operation of the automatic voltage regulator in a control system in advance to form a candidate controller set; the candidate controllers are kept consistent in control structure, but control parameters are different, so that the corresponding closed-loop dynamic characteristics are different; (3) controller switching triggering and execution; and (4) performing operation and continuous defense after switching. According to the method, a dynamic switching mechanism of a controller is introduced in a system operation process, so that dynamic characteristics of a closed-loop system change along with time, and therefore, system uncertainty which is difficult for an attacker to accurately model and a fixed model assumption on which zero dynamic attack is destroyed to be established are actively constructed; on the premise of ensuring stable operation of the automatic voltage regulator, effective defense and suppression of zero dynamic attacks are realized.

A converter brake control method, comprising: in response to a wind turbine triggering a fault shutdown, controlling a converter to enter a brake load-reduction mode, wherein the brake load-reduction mode comprises: controlling a brake circuit of the converter to be closed, and controlling the torque at a rectification side of the converter to be reduced to a preset range; in response to meeting a brake load-reduction mode end condition, controlling the converter to exit the brake load-reduction mode; and controlling a safety chain of the converter to be disconnected. When a wind turbine triggers a fault shutdown, the energy consumption of a brake circuit of a converter is controlled and the torque of the converter is controlled to be reduced to a preset range, so that torque support of a shutdown process can be achieved, and the shutdown load of the wind turbine can be reduced. In addition, the present invention also relates to a controller and a wind turbine.

This invention relates to the field of power plant data acquisition and control technology, specifically to a data communication control method and system for pumped storage power plants. The invention first acquires temperature data at each preset measuring point on the excitation winding under different operating conditions. Then, combining the location distribution of the preset measuring points, it obtains the temperature distribution non-uniformity of each excitation winding under each operating condition, thereby screening out suspected short-circuit excitation windings. Next, it obtains the short-circuit coefficient of the suspected short-circuit excitation winding under each operating condition, assessing the communication necessity coefficient of generator short-circuit information at the current moment to control communication transmission. This invention combines the distribution of the excitation winding and the coil distribution on the excitation winding to analyze the temperature distribution of the excitation winding at different power generation stages, and then comprehensively assesses the temperature distribution of the excitation winding at all power generation stages to accurately evaluate its short-circuit fault probability and communication necessity. Through targeted communication transmission of fault-related information, it reduces communication burden while minimizing fault losses.

Aspects of the present invention relate to a method (100) for reducing high torque levels and / or high rates of change of torque in a wind turbine generator (10) that comprises a machine-side converter (28) and a line-side converter (30) connected by a DC link (32), and, wherein the line-side converter (30) is operated according to a virtual synchronous machine control scheme. The method (100) comprises: determining (102) a generator torque (Tref); determining (104) a torque surplus (Tsurplus) indicating the amount that the generator torque (Tref) exceeds a torque limit; determining (106) an active power surplus (Psurplus) corresponding to the torque surplus (Tsurplus); controlling (108) the line-side converter (30) according to the virtual synchronous machine control scheme using an input parameter configured to reduce the active power output of the line side converter (30) by the active power surplus (Psurplus).

The embodiment of the application provides a self-checking method and system of a household air conditioner motor, and belongs to the technical field of motor self-checking. The method comprises the following steps: in response to a self-checking request of a user for the air conditioner motor, obtaining working voltage and actual rotating speed of the air conditioner motor at subsequent multiple time points since the request; obtaining a rotating speed limit threshold corresponding to each of the working voltage of the air conditioner motor at the multiple time points, and when the actual rotating speed at the multiple time points is all within the corresponding rotating speed limit threshold, calculating a difference between the actual rotating speed of the air conditioner motor at the multiple time points and a minimum value in the rotating speed limit threshold; obtaining a current change value of the multiple differences, determining a current air conditioner motor maintenance strategy corresponding to the current change value according to a corresponding relationship between the change value and the air conditioner motor maintenance strategy, and prolonging the use time of the air conditioner motor. The self-checking method and system of the household air conditioner motor can give a warning for the use state of the air conditioner motor, timely check out existing problems, execute corresponding operations, and avoid faults.

This invention relates to a control method and system for real-time optimization of the excitation system of a dual-shaft generator. The method establishes control parameters for the dual-shaft generator excitation system, including active power control parameters and reactive power control parameters. It also obtains the real-time response of the dual-shaft generator after disturbance, the real-time response including the active power deviation e. P Active power deviation change rate (ec) P and reactive power deviation e Q Reactive power deviation change rate (ec) Q Adjust the active power control parameters until the active power deviation e P Active power deviation change rate (ec) P The reactive power control parameters are set to zero to obtain the optimized active power control parameters; the reactive power control parameters are then adjusted until the reactive power deviation e is zero. Q Reactive power deviation change rate (ec) Q The reactive power control parameters are obtained by setting the value to zero. This invention enables real-time optimization of the excitation system parameters, improving the control effect of the excitation system and enhancing the stability of the power system.

The application discloses a kind of temperature closed-loop control high-efficiency energy-saving generator, comprising: temperature detection unit, it includes multiple temperature detectors, multiple temperature detectors are respectively installed at the both ends of the stator assembly of generator, and respectively with the stator coil of the both ends of stator assembly is connected;Temperature control regulator, it includes controller, and temperature acquisition module, voltage acquisition module, rotor excitation current adjustment module, voltage adjustment module connected therewith, the temperature acquisition module is connected with each temperature detector, for collecting the temperature at the both ends of stator assembly, the voltage acquisition module is used to collect the voltage of generator power generation output end, the rotor excitation current adjustment module is used to control and adjust the size of rotor excitation current, the voltage adjustment module is used to adjust the voltage of generator.The application can realize the output voltage and current of closed-loop self-control generator, so that generator is always in the best state to meet the power demand of whole vehicle, reduce the heat loss of motor, energy-efficient.

This application provides a generator controller control method for a constant frequency AC power system to solve the engagement problem caused by the weak constant load capacity of the constant frequency AC power system at low speeds. The method includes: periodically acquiring the generator excitation voltage, frequency, generator control switch signal, main contactor signal, and generator three-phase current obtained through the current transformer; when it is determined that the generator excitation voltage and frequency are less than predetermined values, and the generator control switch signal and main contactor signal are both on, and any current in the three-phase current transformer is less than a predetermined value, a chopping indicator is generated; based on the chopping indicator, the voltage regulator is controlled to disable operation, so that the excitation current in the generator excitation circuit undergoes a chopping process to adjust the duty cycle of the excitation current, thereby reducing the generator three-phase AC output voltage, reducing the load power, increasing the generator frequency, and causing the constant frequency AC power system to enter underfrequency protection, thus solving the main contactor engagement problem.

A method of controlling a wind turbine (1) having a generator (10) and a machine-side converter (12). The method comprises detecting an arc in or on a connection (13) between the generator (10) and the machine-side converter (12), and operating the machine-side converter (12) to quench the arc.

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

The invention discloses a large-temperature-difference wide-temperature-range generator operation stability guarantee system, and belongs to the technical field of steam power generation. The environment and state sensing module is electrically connected with the central control unit and used for collecting temperature, pressure, vibration, rotating speed and environment parameters of key parts of the steam turbine generator in real time and predicting the future short-time environment temperature change trend; the intelligent control center module is connected with the environment and state sensing module, and a digital twinborn model and a thermal stress prediction algorithm are built in the intelligent control center module; the system can realize real-time high-precision sensing and prediction of the global thermal state of the generator, actively stabilizes harmful temperature gradient through intelligent cooperation of multiple execution mechanisms, controls thermal stress within a safe range by using a hydrogen inner cooling mode, and improves the safety of the generator. Therefore, the starting speed, the load response capability, the operation stability and the service life of the generator in a severe temperature environment are obviously improved.

Sensor device (10) comprising the following: at least one first sensor element (13) with a first detection direction configured to generate at least one first sensor signal (Sx, Sx1) based on the detection of a first magnetic field component of a varying magnetic field oriented in the first detection direction; at least one second sensor element (14) with a second detection direction, configured to generate at least one second sensor signal (Sy, Sx2) based on the detection of a second magnetic field component of the varying magnetic field, which is oriented in the second detection direction; a signal processing circuit (15, 16) configured to generate a first pulse signal (S1) based on the at least one first sensor signal (Sx, Sx1) and to generate a second pulse signal (S2) based on the at least one second sensor signal (Sy, Sx2); a fault detector (18) configured to detect at least one fault and to generate a fault signal indicating the at least one fault in response to the detection of the at least one fault; and an output generator (17) configured to receive the first pulse signal (S1) and the second pulse signal (S2), the error signal based on a first condition that the error detector (18) detects the at least one error, and simultaneously output a first output signal (OUT1) and a second output signal (OUT2), wherein, based on a second condition that the fault detector (18) does not detect the at least one fault, the output generator is configured to output the first pulse signal (S1) as the first output signal (OUT1) and to output the second pulse signal (S2) as the second output signal (OUT2), and wherein, in response to the first condition being satisfied, the output generator (18) is configured to keep the first output signal (OUT1) in a steady state and to output the second pulse signal (S2) as the second output signal (OUT2), wherein: the first pulse signal (S1) comprises several transition edges that define several first pulses, the second pulse signal (S2) comprises several transition edges that define multiple second pulses, and the first several transition flanks are synchronized with the second several transition flanks.

The invention relates to a method for monitoring and protecting an electrical hybridization system for an aircraft (400), the system comprising a first reversible electric machine (100), a second reversible electric machine (200), and two electrical power distribution units (330, 340), each electrical power distribution unit (330, 340) comprising a high-voltage busbar (335, 345), a first controlled switch, and a second controlled switch (334, 344), the method comprising, for each controlled switch: - determining the operating mode of the electric machine coupled to the controlled switch; - measuring the current (Imes1) at the input of the controlled switch; and - a step of opening the controlled switch if both: - the measured current (Imes1) is in a direction opposite to the direction of the expected nominal current; and - the value of the measured current (Imes1) is higher than at least one current threshold (Iseuil1).

Method for monitoring and protecting an electrical hybridization system. The invention relates to a method for monitoring and protecting an electrical hybridization system for an aircraft (400), the system comprising a first reversible electrical machine (100), a second reversible electrical machine (200), and two electrical power distribution units (330, 340), each electrical power distribution unit (330, 340) comprising a high-voltage distribution busbar (335, 345), a first controlled switch, a second controlled switch (334, 344), the method comprising for each controlled switch: - a determination of the operating mode of the electrical machine coupled to the controlled switch, - a measurement of the current (Imes1) at the input of the controlled switch, and - a step of opening the controlled switch if, simultaneously: - the measured current (Imes1) is in the opposite direction to the expected nominal current,and - the measured current value (Imes1) is greater than at least one current threshold (Iseuil1). Figure for the abbreviation: Fig.3,

Aspects of the invention relate to a method (100) for reducing a high torque level and / or a high rate of change of torque in a wind turbine generator (10) comprising a machine-side converter (28) and a line-side converter (30) connected by a DC link (32), and the line-side converter (30) operating according to a virtual synchronous machine control scheme. The method (100) comprises: determining (102) a generator torque (T ref ); determining (104) a torque surplus (T surplus ) indicative of an amount by which the generator torque (T ref ) exceeds a torque limit; determining (106) an active power surplus (P surplus ) corresponding to the torque surplus (T surplus ); controlling (108) the line-side converter (30) according to the virtual synchronous machine control scheme, the virtual synchronous machine control scheme using input parameters and being configured to reduce an active power output of the line-side converter (30) by the active power surplus (P surplus ).