203results about "Synchronous generator control" patented technology

The present invention discloses a charging and discharging control method and system for an electric vehicle based on virtual synchronization, and relates to the technical field of virtual synchronization. The method includes: establishing connection between a power grid and the electric vehicle, and acquiring a charging and discharging operation demand; acquiring, according to the charging and discharging operation demand, a corresponding control instruction and constraint condition, and executing a charging and discharging operation; and providing a human-computer interaction interface for measuring and settling charging and discharging energy, along with authentication. The present invention achieves efficient and coordinated charging and discharging control, precise measurement and convenient authentication, and improves availability and reliability of the system.

The invention discloses a VSG transient stability control method based on PSS power angle compensation and integral reactive loop cooperation, and the method comprises the steps: constructing an improved rotor motion equation compensation mechanism based on a power system stabilizer, and based on the dynamic parameters of the voltages vabc and pcc at a PCC point and the currents iabc and pcc flowing into the PCC point which are collected in real time, carrying out the compensation of the current iabc and pcc at the PCC point under the condition that the working condition is that the voltage of a power grid drops greatly. The dynamic characteristic of active power is ensured; constructing a PSS parameter optimization method based on zero point position constraint; an integral link is embedded in the traditional voltage-reactive droop characteristic, integral reactive loop control is constructed, and steady-state voltage deviation is eliminated; the output compensation power angle delta and the output voltage amplitude E are cooperatively applied and converted into dq-axis voltage components Ed and Eq, the dq-axis voltage components Ed and Eq are sent to a voltage and current double closed loop, a driving signal is generated through SVPWM, and the stability of the system is enhanced.

The invention discloses an active control method and system for suppressing torsional vibration of a permanent magnet synchronous wind driven generator, and the method comprises the steps: building a dual mass-rigidity-damping model through a lumped mass method based on transmission chain parameters and pneumatic torque, and obtaining a transmission chain dynamic equation; performing torsional vibration characteristic analysis on the natural wind speed, the pneumatic torque and the transmission chain dynamic equation to obtain a torsion angle, an eigenfrequency, a damping ratio equation and electromagnetic torque influence evaluation; and controller design is carried out on the torsional vibration mathematical model and the active disturbance rejection controller parameters to obtain an electromagnetic torque compensation amount, and active suppression of torsional vibration is realized. According to the invention, through cooperation of a physical model and intelligent control, a sensing-analysis-compensation closed loop is formed; a high-precision mathematical model is constructed, and a wind-machine-electricity coupling effect is captured; the ADRC regards unknown parameters and external disturbance as total disturbance, real-time estimation and compensation are carried out through a tracking differentiator, and an accurate system model is not needed; torsional vibration is restrained, and adaptability is enhanced.

The invention relates to an optimal proportioning method for a grid-constructing type wind turbine generator and a grid-following type wind turbine generator in a wind power plant, solves the problem of subsynchronous oscillation of the grid-following type wind turbine generator in the wind power plant under a weak power grid, and belongs to the technical field of electrical equipment. The method comprises the following steps: respectively establishing state space models of single machines and power grid lines of a network-constructing type wind turbine generator and a network-following type wind turbine generator; according to the established state space model, single-machine port frequency domain impedance in the grid-forming type wind turbine generator set and the grid-following type wind turbine generator set is obtained, black box processing is conducted on all the generator sets, and the equivalent impedance of a whole grid-connected port of the wind power plant is calculated in combination with the connection mode between the wind turbine generator sets and the connection mode between the wind turbine generator sets and a power grid line; positive and negative resistance and capacitive-inductive reactance characteristics of the subsynchronous frequency band are obtained according to the equivalent impedance, the overall interference stability of the wind power plant is judged according to the characteristics, if the stability is not stable, the proportion of the net-forming type wind turbine generator is increased, the equivalent impedance is calculated again till the stability is achieved, and the proportion is output.

The invention discloses a current compensation type three-vector model prediction control method for an off-grid doubly-fed wind turbine generator, belongs to the technical field of doubly-fed wind turbine generator control, and aims to solve the problems of voltage sag and high total harmonic distortion rate of a micro-grid system caused by sudden load change during off-grid operation of the doubly-fed wind turbine generator. The control method comprises the steps that on the basis of virtual synchronous networking control, an off-grid doubly-fed wind turbine generator rotor current prediction model is established, load current, stator side converter current and stator voltage are introduced into three-vector model prediction control, and the voltage coupling effect and current change caused by load abrupt change are compensated in real time, so that the rotor current of the off-grid doubly-fed wind turbine generator is predicted. Obtaining a compensated rotor current reference; a cost function is designed by taking the minimum prediction error of the rotor current as a target, so that accurate prediction of the rotor current during sudden load change is realized, a voltage sag phenomenon caused by sudden load change is effectively inhibited, the harmonic content of output voltage is reduced, and meanwhile, quick response to system frequency and load power is realized.

The invention relates to an inertia synchronization PMSG self-adaptive control method based on online impedance estimation, and belongs to the field of new energy grid connection. The method comprises the following steps: S1, constructing an RLS-GA hybrid strategy algorithm to quickly and accurately identify power grid impedance, and determining the strength type of a power grid; s2, establishing a direct-drive fan grid-connected system control strategy, and adopting a power control ring, a current control ring and an inertia transmission control ring at a machine side; the grid side adopts a direct-current voltage synchronous loop, a reactive voltage control loop and a stabilization control loop; s3, linearizing the control equation, and based on a linearized small signal equation, obtaining a state variable of the direct-current voltage synchronous control grid-connected system of the grid-forming type direct-driven wind turbine generator; s4, calculating control parameters of a reactive voltage control loop and a direct-current voltage synchronous loop; and S5, carrying out adaptive parameter setting on an existing permanent magnet fan inertia synchronization strategy so as to adapt to the change of strong and weak power grids and improve the stability performance of the PMSG under different power grid short circuit ratios.

The disclosure relates to a four-phase motor and generator device with increased efficiency for generating electrical energy. The device features a stator wall with eight stator slots and four pole groups, and an armature rotatable within the stator wall. The eight stator slots are divided into four pole groups of opposing stator slots; the two opposing stator slots include an N (North) stator slot and an S (South) stator slot. N and S stator slots are alternatively activated in response to the rotation of the armature. The activation of the armature pole groups results in armatures rotating the magnetic field within the stator wall, and only four of the eight poles are actively coupled in any given configuration. The disclosure also includes a method of operating the motor for generating electrical energy with increased efficiency and in an environmentally friendly manner compared to conventional motors.

An electric drive unit (1A, 1B) for an aircraft (2) comprises an electric machine (10A, 10B) with at least one stator (100A, 100B) and at least one rotor (101A, 101B) rotatable relative to it about an axis of rotation (D), wherein the electric machine (10A, 10B) has several sub-machines (M1-M4) each with an electrical winding system (W1-W4), wherein the winding systems (W1-W4) can be energized independently of each other to set the at least one rotor (101A, 101B) into rotation about the axis of rotation (D), wherein the power of an energization of the winding systems (W1-W4) can be adjusted differently from each other.

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 a method for controlling an electrical generator of a wind turbine, the generator having a rotor and a stator, the stator being controlled by means of a stator current, the stator current having a main component being characterized by a fundamental signal with a fundamental frequency and a fundamental phase angle and a fractional harmonic current component being characterized by a fractional harmonic signal having a fractional harmonic frequency and a fractional harmonic phase angle, comprising the steps providing a compensation current having a compensation amplitude and a compensation phase angle, and determining the compensation phase angle depending on an absolute rotational position of the rotor.

This invention relates to a voltage limiting control method for a series-type offshore wind power DC collector system, comprising: superimposing a low-voltage DC link voltage control loop on the power control loop of the wind turbine generator-side converter, and obtaining a reference value for the d-axis component of the generator-side converter voltage. umsd_ref and q-axis component reference value umsq_ref The control signal for the generator-side converter is generated through sinusoidal pulse width modulation to maintain stable low-voltage DC link voltage while ensuring stable power output. The grid-side converter of the wind turbine adopts voltage / frequency control to obtain the d-axis reference value of the grid-side converter output voltage. uod _ ref and q-axis reference value uoq _ ref The grid-side converter control signal is generated by sinusoidal pulse width modulation. By setting the d-axis setpoint of the grid-side converter output voltage, the AC output voltage of the grid-side converter is limited, thereby controlling the DC output voltage of the wind turbine generator within the limit value.

A gas turbine engine having a first pressure spool and a second pressure spool includes a power transfer system to transfer mechanical power between the first pressure spool and the second pressure spool. The first pressure spool can include a first electric machine to convert mechanical power from the first pressure spool to a first electric power. A coupled electric machine having a first coupled rotor and a second coupled rotor can be rotatingly coupled to the first pressure spool and the second pressure spool, respectively. The coupled electric machine is configured to receive an output power (e.g., an output power from an AC / AC converter) to drive a winding of the coupled electric machine to enable power transfer between the first pressure spool and the second pressure spool. An AC / AC converter can be electrically disposed between the first pressure spool and the second pressure spool.

To operate a turbine type flow volume control device in a stable manner at an early stage even when a state in which a flow volume of a fluid is low occurs.SOLUTION: A main circuit 91 of a turbine type flow volume control device 10 recovers a regenerative electric power generated by a rotation of a turbine 31 of a generator 30, and controls a rotation of the turbine 31 by inputting an electric power to the generator 30. The main circuit 91 includes a DC link capacitor 91A and outputs the regenerative power according to a DC link voltage Vm. Circuits 92A to 92E control the operation of the main circuit 91 and operate by the regenerative power output from the main circuit 91. When the DC link voltage Vm is lower than Vm2, a first power supply part 95C supplies a power stored in a first power storage unit 95B to the main circuit 91 to charge the DC link capacitor 91A. A second power supply part 96D operates the circuits 92A to 92E by supplying the power stored in a second power storage part 96B to the circuits 92A to 92E when the DC link voltage Vm is lower than Vm2.SELECTED DRAWING: Figure 2

The invention discloses a wind power generation and energy storage integrated system based on an open winding motor and a control method of the wind power generation and energy storage integrated system. The system comprises an open winding permanent magnet synchronous wind driven generator, a controller, an energy storage device, a machine side converter, a network side converter, a three-phase diode rectifier bridge, a capacitor, a three-phase power grid and a filter. Compared with a traditional direct-drive type permanent magnet synchronous wind power generation system, the wind power generation system has the advantages that the structural characteristic of double-end feed of the open winding motor is utilized, the capacity of the system for absorbing wind energy can be brought into full play, and the problem of low electric energy quality caused by intermittent wind power generation and generated power fluctuation is solved. The invention can effectively reduce the cost of the open winding permanent magnet synchronous wind power generation system, improve the energy utilization rate, reduce the system control complexity and improve the power quality of the power grid.

This invention discloses a method for configuring phase-shifting parameters of a STATCOM controller to suppress subsynchronous resonance, comprising: determining the target generator set to be suppressed by the STATCOM controller, its target torsional vibration mode, and typical operating modes; for each typical operating mode in the set of typical operating modes, using the modal waveform envelope attenuation constant comparison method, calculating the effective range of phase-shifting angles in which the STATCOM controller can provide positive electrical damping for the target torsional vibration mode in electromagnetic transient simulation; performing an intersection operation on the effective ranges of phase-shifting angles of all typical operating modes to obtain a common safe configuration range; selecting phase-shifting angle values ​​from the safe configuration range and configuring them into the damping control channel of the corresponding key shaft torsional vibration mode in the STATCOM controller.

The objective is to provide a control device for a rotating electric machine that can prevent the generation of gate command signals that attempt to perform synchronous rectification during an abnormal period, even when the diode on-timing or diode off-timing cannot be correctly detected. [Solution] The control device 100 includes a synchronous rectification permission signal generation unit that generates synchronous rectification permission signals Swp and Swn based on the conduction state of the diodes; a switching signal generation unit 54 that generates switching signals Qp and Qn by setting the ON interval of the switching element within the range of the synchronous rectification permission intervals Tp and Tn indicated by the corresponding synchronous rectification permission signals Swp and Swn; an assumed permission interval setting unit that sets assumed permission intervals Tp* and Tn* of the synchronous rectification permission signals Swp and Swn based on the operating state of the rotating electric machine 1; and an abnormality determination unit 56 that determines whether or not there is an abnormality by comparing the synchronous rectification permission intervals Tp and Tn with the assumed permission intervals Tp* and Tn*.

An electric machine assembly comprising an electric machine (5) having a stator (9) and a rotor (10) rotatable about an axis (A); and at least one detecting device (6) housed inside the stator (9) and comprising a magnetic probe (41) for measuring a magnetic induction (B) value of the electric machine (5), and a temperature probe (42) for measuring a temperature (T) value of the electric machine (5).

The invention relates to the technical field of energy storage unit control, and discloses a method, a device and equipment for controlling the wide short-circuit ratio of a full-power pumped storage unit, and a medium. The method comprises the following steps of: controlling a grid-side converter by using a wide short-circuit ratio network construction type control strategy; wherein the control strategy of the wide short-circuit ratio network construction type comprises the following steps: tracking a reference voltage obtained according to a first output voltage output by a network-side current inner loop and a network-side three-phase current transmitted by a network-side converter by using a voltage and current double closed-loop control strategy, and obtaining a second output voltage of a network-side current loop; generating a first switching signal according to grid-side phase information of operation of the grid-side converter and the second output voltage so as to drive the grid-side converter; acquiring voltages at two ends of the direct-current capacitor to obtain a capacitor voltage actual value; and generating a second switching signal according to the capacitor voltage actual value and the capacitor voltage reference value so as to drive the machine-side converter. Therefore, the stability of the full-power pumped storage unit is improved.

A method for controlling an electrical converter is disclosed. First, an average flux reference is determined from a reference torque and an estimated torque. At least one difference flux reference is determined from at least one difference current reference. A winding flux reference for each winding system is determined from the average flux reference and the at least one difference flux reference by adding and / or subtracting the at least one difference flux reference to the average flux reference. Switching commands for each converter branch are determined from the winding flux reference and an estimated winding flux for the winding system, which is connected to the respective converter branch. The winding flux reference and the estimated winding flux are provided to a dedicated model predictive controller for the respective converter branch, which determines the switching commands; and applying the switching commands to each converter branch.

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.

To provide a hydroelectric power generation device, a hydroelectric power supply system, a hydroelectric power supply method, and a program that can stably supply DC power while keeping costs down. [Solution] The hydroelectric power generation device according to the present disclosure comprises a water turbine that converts the potential energy of water into kinetic energy, a rotating shaft connected to the water turbine, a generator that converts the kinetic energy from the rotation of a rotor connected to the rotating shaft into DC power, a dummy load section equipped with a resistor that consumes power, and a dummy load control section that controls the connection of the dummy load section to the output of the generator so that the rotational speed of the rotating shaft is within a predetermined range.

The application provides a kind of generator speed measurement method, device, equipment, medium and software product, for static frequency converter SFC device, in the energy storage stage of pumped storage power station, the SFC device is controlled by the generator to the generator with output drive current to start in electric mode, wherein the method comprises: collecting the real-time terminal voltage data of the generator, and determining the real-time speed of the generator according to the real-time terminal voltage data;Sending step: the real-time speed is sent to the controller of the SFC device, and the real-time speed is used to determine the current value of the drive current output to the generator at the next time by the controller.The application avoids the need to lay multiple sets of sensors and multiple sets of corresponding sensor signal transmission lines in the prior art, with small installation workload, less maintenance workload and low engineering cost.

The invention relates to a maximum power control system and method for an oscillating water column type wave energy power generation device. The maximum power control system for the oscillating water column type wave energy power generation device comprises a turbine-permanent magnet generator, a battery charger, a battery pack, an inverter, an adjustable load box and a main controller. The maximum power control method for the oscillating water column type wave energy power generation device comprises the specific steps that a wave energy power generation device power curve is established, a battery charger outputs electric energy to charge a battery pack according to the wave energy power generation device power curve, and a battery pack voltage state machine control algorithm is designed to adjust the resistance value of an adjustable load box. Therefore, the maximum power output of the wave power generation device is ensured.

The invention discloses a phase-locked loop control method of a permanent magnet synchronous generator, which belongs to the technical field of motor control and wind power generation, and comprises the following steps: acquiring two-phase current and two-phase voltage under a static coordinate system, and calculating through a sliding-mode observer to obtain a shaft and an extended counter electromotive force estimated value of the shaft; designing a finite position set phase-locked loop based on Taylor series and a Newton iteration method, performing quadrant judgment and correction processing on a rotor position estimation value after primary iteration to obtain a final rotor position estimation value, performing differential operation on the final rotor position estimation value, and processing a differential result by using a low-pass filter to obtain a final rotor position estimation value; obtaining a rotating speed estimation value of a rotor, and integrating the sliding-mode observer and a finite position set phase-locked loop to a motor vector control system to realize position sensorless control; according to the phase-locked loop control method of the permanent magnet synchronous generator, the calculation burden is greatly reduced while the precision is ensured.

The invention provides an electric and power generation integrated synchronous motor, relates to the technical field of new energy electric power engineering equipment, and solves the limitation problems of insufficient frequency stability and inertia and the like during grid connection of an existing new energy system. The synchronous motor comprises a base, a stator core, a rotor and a rotating shaft, the stator core and the rotating shaft are both mounted on the base, and the rotor sleeves the rotating shaft; a stator winding is arranged on the stator core, the stator winding comprises an electric winding and a power generation winding which are mutually independent, the positions of the electric winding and the power generation winding are correspondingly arranged, and the neutral points of the electric winding and the power generation winding are not connected; the electric winding is connected with the output side of the new energy system, and the power generation winding is connected with the external power grid side. And an excitation winding is arranged on the rotor and is used for generating a main magnetic field under the action of an externally input excitation current. The device integrates electric and power generation functions, has high inertia capability and frequency stability, and also has the advantages of small size and high efficiency.

To provide a power storage and discharge system capable of efficiently supplying appropriate auxiliary power at low cost as needed according to changes in power transmission demand as a whole power system even if power generation failure occurs at one power receiving point. A power storage and discharge system includes one or more power receiving points of an AC source supplied from a predetermined power system, and an AC-DC converter 2 for converting the AC source supplied from the predetermined power system into a DC source. Any of two or more equally dividable storage battery groups 6A and 6B is charged based on the DC source converted by the AC-DC converter 2. AC power is discharged or generated due to discharging by a discharge resource using the charged DC source. The power receiving points of the AC source include one or more power receiving points, disposed from an upper side toward a lower side with respect to the predetermined power system, other than a point where the power discharged or generated due to discharging by the discharge resource is interconnected to the power system.

The invention discloses a synchronous generator rotor position sensor fault detection method, device and equipment, and the method comprises the steps: estimating the counter electromotive force of a generator through a second-order generalized integral sliding-mode observer, extracting the estimation values of the rotor position and the rotating speed from the counter electromotive force, and enabling the estimation values to serve as the standby output of a position sensor, when the sensor is abnormal, the abnormality can be found in time by judging the magnitude of the residual error, a standby signal is switched, and safe and stable operation is realized in a position-sensor-free state, so that the safety and reliability of the system are effectively improved; the second-order generalized integral sliding mode observer is a back electromotive force observer, a transfer function of the observer shows band-pass filtering characteristics, indifference estimation of the rotor position can be achieved, meanwhile, the system does not need to be additionally provided with a low-pass filter, and the control structure is simplified.

The invention discloses a virtual synchronous machine control method based on active fractional order high-pass filter feedback, and the method comprises the steps: introducing a power dynamic compensation link based on the active fractional order high-pass filter feedback into a conventional virtual synchronous machine grid-connected control structure; according to the method, the dynamic response performance of the active power and the output frequency of the virtual synchronous machine grid-connected system is improved, and the parameters of a fractional order high-pass filter and a feedback compensation coefficient are adjusted; the method can effectively suppress dynamic oscillation and overshoot of active power and output frequency of the virtual synchronous machine grid-connected system caused by active reference instruction change or power grid frequency disturbance, and has the advantages of higher control degree of freedom, more flexible parameter adjustment and smaller output frequency response overshoot amplitude compared with a traditional virtual synchronous machine grid-connected control method. The method can be applied to the field of virtual synchronous machine grid-connected control in the power electronic technology.

The application discloses a double-fed wind power flexible DC transmission system DC overvoltage suppression method and device, and the method comprises the following steps: collecting the DC line voltage of the flexible DC system, calculating the surplus power by using the charging effect of the converter submodule; determining the dynamic voltage reduction coefficient of the wind farm side flexible DC converter station WFMMC according to the surplus power amount; determining the value range of the dynamic voltage reduction coefficient to ensure that the double-fed wind farm enters the low voltage ride-through interval; after the double-fed wind farm enters the low voltage ride-through interval, determining the reduction amount of the power output according to the surplus power amount; and distributing the reduction amount to each wind turbine connected to the AC side of the WFMMC according to the power reduction distribution coefficient; detecting the DC voltage of the wind turbine converter, and if the DC voltage exceeds the action value, the DC voltage of the converter is suppressed. The application effectively suppresses the DC system overvoltage problem from the DC system converter and the double-fed wind turbine generator set side.

The present invention provides a self-generating strength training device, comprising: a permanent magnet motor (1) providing an electronic counterweight, a strength output and input structure (2) connected to the permanent magnet motor (1), a motor driver (3), a capacitor (5), an energy storage component (6), an electric quantity monitor (7), a charge and discharge circuit (8) and a controller (9), wherein the controller (9) is configured to determine which training modes can be provided according to the electric quantity in the energy storage component. When the electric quantity in the energy storage component is less than a specified first electric quantity, the strength training device can only provide an aerobic training mode as a power generation mode. When the electric quantity in the energy storage component is greater than or equal to a specified second electric quantity, the aerobic training mode and other training modes can be provided until the electric quantity in the energy storage component is less than the first electric quantity, wherein the second electric quantity is greater than the first electric quantity. Thus, the strength training function of the device can be provided while self-generating.