115results about "Generation protection through control" patented technology

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.

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 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 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.

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 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 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.

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 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.

The invention relates to a method for controlling wind turbine transients. The wind turbine generator includes a power converter including a machine-side converter and a line-side converter and a DC link. A grid voltage reference for controlling the line-side converter is determined, and the power (PLsc) supplied to the grid is controlled by the line-side converter using a grid formation controller. The machine-side converter and the generator are controlled according to the power reference (PMsc). An error between the measured DC link voltage value and a DC link reference value is determined, and a voltage correction component is derived in response to the error signal. The voltage correction component is added to an output voltage of the grid formation control, and the line-side converter is operated according to the combined output voltage.

The invention discloses a control method and system for adaptive commissioning of main steam pressure under various working conditions of an energy storage generator set. The system comprises a first greater comparison module, a first non-module, a first AND module, a third non-module, a fourth non-module, a third AND module, a first SR module, a third OR module and the like. The method comprises the steps that the actual working state of main steam pressure protection input of the energy storage generator set is judged, and when the main steam pressure of the energy storage generator set meets the preset value of a first larger comparison module, the main steam pressure limiting set value is wrongly 0, the main steam pressure limiting protection input is 1, and the main steam pressure is smaller than the main steam pressure low limit value and is 0, the actual working state is judged; when the main steam pressure is larger than the main steam pressure high limit value which is 0, the main steam pressure protection input of the energy storage generator set is 1, the state shows that the main steam pressure protection of the energy storage generator set is input, and the change condition of the main steam pressure can be comprehensively monitored at any time. According to the invention, regular inspection and maintenance of the unit are realized so as to ensure long-term stable operation of the unit.

A method (200) for operating a permanent magnet electric machine of an engine includes (202, 204) determining a fault condition of the permanent magnet electric machine; and (206) reducing a magnetism of one or more permanent magnets of the permanent magnet electric machine by increasing a temperature of the one or more permanent magnets in response to determining the fault condition of the permanent magnet electric machine.

The invention relates to a variable-speed pumped storage unit stator grounding and rotor grounding fault arc extinction method and device based on machine end injection. The method comprises the following steps: acquiring and determining a phase corresponding to a minimum actual voltage in three phases of the variable-speed pumped storage unit as a fault phase under the condition that a ground fault of the variable-speed pumped storage unit is monitored, and acquiring a first electric signal under the condition that the ground fault is a stator ground fault; according to the first electric signal, a first arc extinction compensation amount is determined, and the first arc extinction compensation amount is injected into a stator winding from the machine end of the variable-speed pumped storage unit, so that effective arc extinction of a stator grounding fault is achieved; and when the grounding fault is the rotor grounding fault, acquiring an injection signal and a second electric signal, then determining a second arc extinction compensation amount according to the injection signal, the fault phase and the second electric signal, and injecting the second arc extinction compensation amount to the rotor winding from the machine end of the variable-speed pumped storage unit so as to realize effective arc extinction of the rotor grounding fault.

This application belongs to the field of generator relay protection, and specifically discloses a generator differential protection method for a rod-controlled power supply system in a nuclear power plant. The method includes: obtaining the ratio braking characteristic differential protection action criterion, the dual-generator internal short-circuit fault main protection mode, and the current phasors at the neutral point and the machine end of each phase stator winding of each generator; using the current values ​​at the neutral point and the machine end of the corresponding phase stator winding of the dual generator, and according to the dual-generator internal short-circuit fault protection mode, calculating the differential current and braking current of each phase; for each phase stator winding, using the phase differential current, braking current, and ratio braking characteristic differential protection action criterion to determine whether the phase stator winding has a fault; for a faulty stator winding, using the negative sequence power direction criterion of the phase stator winding to determine the generator to which the fault belongs. This application can effectively identify inter-turn short circuits, inter-phase short circuits, and stator welding faults in rod-controlled power supply generators, and determine the faulty unit.

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.

The invention discloses an energy consumption speed reduction device and method of an impact short-circuit generator. The energy consumption speed reduction device comprises an impact short-circuit generator system, an isolating switch in a loop, a closing switch, a protection circuit breaker, an operation circuit breaker, an electric reactor and an energy consumption resistor. The impact short-circuit generator system comprises an impact short-circuit generator body, a variable-frequency speed regulation system and an excitation system. The energy consumption speed reduction device loop is formed by connecting a plurality of devices in series; comprising an isolating switch used as a visible fracture, a closing switch for switching on an energy consumption loop, a protection circuit breaker and a reactor for protecting a test loop, an operation circuit breaker for cutting off a load, and an energy consumption resistor connected to a load side. According to the energy-consuming speed reducer for the impact short-circuit generator, the rotating speed of the generator can be instantaneously reduced to 2000 revolutions from 3000 revolutions until the rotating speed is zero, the problems of emergency shutdown in an emergency situation and long free shutdown time after a test can be solved, the operation safety risk of the impact generator is reduced, and meanwhile the test efficiency 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 wind turbine assembly comprising a rotor system (2), a generator (4), a first converter (61), a second converter (62), and a controller system (909). The first converter (61) comprises a first bridge circuit having a plurality of switch members each having a controllable switch. The second converter (62) comprises a second bridge circuit having a plurality of switch members each having a controllable switch. The controller system (909) is adapted to provide a drying operation for second converter comprising short circuiting the second converter (62) with the controllable switches of the second bridge circuit, and supplying power from the generator (4) through the first converter (61) to the short circuited second converter (62) for drying the second converter (62).

A method for isolating faults in an electrical power system connected to a power grid includes dividing the electrical power system into a plurality of power modules each including a plurality of electrical power subsystems and a substation. Each of the electrical power subsystems defines a stator power path and a converter power path for providing power to the power grid and having a partial power transformer. The method also includes coupling each of the power modules to the power grid via a primary electrical line. Further, the method includes monitoring the electrical power system for faults. In response to detecting a fault in one of the power modules, the method includes isolating the fault to the power module experiencing the fault. In contrast, if the fault is detected in the primary electrical line or the power grid, the method includes tripping the electrical power system.

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.