84 results about "Doubly fed electric machine" patented technology

The invention provides a multi-mode control method and system for a brushless doubly-fed motor, and relates to the technical field of motor control, and the method comprises the steps: extracting torque-rotating speed slopes and dynamic response time constants of two points based on a steady-state working point of a current mode and an expected working point of a target switching mode, and constructing a linear correction function; fusing an output value of the linear correction function with an optimization result to generate a modal transition compensation coefficient, and injecting the compensation coefficient into a rotor side voltage control ring based on a feedforward control channel to generate an anti-disturbance dynamic compensation control strategy; and for a non-smooth adjustment item in the dynamic compensation control strategy, performing smoothing processing on a discontinuous boundary of a control quantity by adopting a subgradient projection algorithm, verifying continuous conductivity of a control curved surface in combination with a Lyapunov stability criterion, and generating a final control instruction. According to the invention, adaptive smooth switching control of the brushless doubly-fed motor can be realized.

The invention belongs to the technical field of power system operation and motors, and particularly relates to an energy storage type phase modifier control method which comprises the steps that a rotating shaft of a double-fed motor is connected with a flywheel to serve as an energy storage type phase modifier; the rotor winding is connected to a power grid through an excitation system and a transformer in sequence, and the excitation system is electrically connected by a reactor, a back-to-back converter and a filter in sequence; the stator winding is directly connected to a power grid; the control system decouples reactive power and active power, vector control is carried out on exciting current to absorb or release power, and reactive power-voltage support and active power-frequency support of the power grid are completed. The method overcomes the defects that a traditional direct-current excitation phase modulation mode can only modulate phase and cannot modulate frequency, or is cumbersome and slow in response. The system can meet the requirement of wide-range variable-speed operation, quickly store / release a large amount of rotor kinetic energy, inhibit the voltage and frequency fluctuation of a power grid, and is especially suitable for stations with high new energy occupation ratio. The invention also provides a non-transitory readable recording medium storing the program of the method and a system comprising the medium, and the program can be called through a processing circuit to execute the method.

The invention belongs to the field of brushless doubly-fed motor control, and particularly discloses a low-bus-capacitor brushless doubly-fed direct-current power generation system direct-current voltage ripple suppression device which comprises a brushless doubly-fed direct-current power generation system, a machine-side converter control system and a direct-current voltage ripple suppression control system. The machine-side converter control system is connected with the machine-side converter and is used for controlling the direct-current bus voltage and suppressing harmonic voltage of a first target number of times of the direct-current bus voltage by adopting a control winding harmonic current compensation method; the direct current voltage ripple suppression control system is connected with the direct current bus and is used for separating harmonic voltage of a first target number of times of the direct current bus voltage and obtaining a harmonic current reference value of a second target number of times of the control winding; the active suppression of the direct-current bus voltage ripple is realized by integrating the harmonic voltage and the harmonic current reference value of the direct-current bus voltage. According to the invention, the system power density is ensured, and the electric energy quality is improved.

The invention relates to the technical field of power system equipment, in particular to a flywheel energy storage phase modifier system based on a brushless doubly-fed motor, which comprises a large-inertia flywheel, the brushless doubly-fed motor, a switch, a converter, a transformer and a power grid, according to the integrated system, the advantages of the synchronous phase modifier, the brushless doubly-fed motor and the flywheel energy storage technology are combined, the good inertia response capability is achieved, an electric brush and a sliding ring are omitted for the brushless doubly-fed motor, the reliability of high-rotating-speed operation is improved, and the operation and maintenance cost is reduced. Through flexible control of winding alternating current excitation and wide-range rotation speed interval operation, rapid active and reactive power support can be provided for a power grid, and multiple functions of power generation, energy storage, phase adjustment and the like can be realized. According to the method, the inherent inertia level of the power system can be remarkably improved, transient active-frequency support is realized in a strong disturbance scene, meanwhile, the dynamic reactive-voltage compensation capability is realized, and the frequency and voltage stability of the power system can be effectively maintained.

The invention provides a multi-input and multi-output frequency coupling admittance modeling method for a follow-up network fan, and belongs to the technical field of large-scale follow-up network type and follow-up network type fan frequency coupling admittance modeling. The technical problem that a network following type GFL and network constructing type GFM doubly-fed fan series-parallel system in a wind power plant lacks an accurate small-signal modeling and analysis method is solved. According to the technical scheme, the method comprises the following steps: S1, establishing an open-loop doubly-fed motor self admittance considering stator and rotor flux linkage dynamics; s2, obtaining frequency domain multiple-input multiple-output admittances of the following network type doubly-fed fan and the constructed network type doubly-fed fan; s3, obtaining a unified multiple-input multiple-output admittance frequency domain model containing a closed loop interconnection system formed by the following network type doubly-fed fan admittance YGFL and the construction network type doubly-fed fan admittance YGFM; and S4, quantitatively evaluating a phase-locked loop parameter and a virtual synchronous control parameter. According to the invention, accurate determination of frequency coupling oscillation is realized.

The invention discloses a doubly-fed induction motor parameter identification method based on adaptive extended Kalman filtering, and aims to solve the problems of low doubly-fed induction motor parameter identification precision and integrity, sensitive noise and the like in the prior art. According to a dq-axis flux linkage equation and a voltage equation of the doubly-fed induction motor, a state space model with dq-axis current of a stator and a rotor as state variables is built, the dimension of the state space model is expanded, the full-parameter observability of resistance Rs and Rr and inductance Ls, Lr and Lm of the motor is judged by utilizing a self-adaptive extended Kalman filtering theory and combining a rank criterion, and the accuracy and accuracy of the state space model are improved. All-parameter identification of inductance and resistance of the motor is realized, and the robustness of the system is improved through a method of adaptively adjusting noise covariance. The parameter coupling influence can be effectively eliminated, and the identification precision is improved; the self-adaptive noise suppression mechanism enhances the anti-interference capability, and meets the dynamic on-line parameter identification requirements of the doubly-fed motor.

The invention discloses a doubly-fed motor rotor end annular cooling channel structure and a heat dissipation method, and relates to the field of motor heat dissipation, the doubly-fed motor rotor end annular cooling channel structure specifically comprises a motor shell and a rotor rotationally arranged in the motor shell, and a rotating shaft is fixedly arranged at the center of the rotor; the rotating shaft rotates to drive the supporting pipe to enable cooling liquid in the annular cooling pipe to rotate at a high speed, strong turbulent flow is formed through stirring of the interference plate, heat dissipation of the end of the rotor is enhanced, air speed generated by high-speed rotation of the heat dissipation fan shrinks an airflow channel through the gathering cover, airflow is forced to pass through the middle of the rotor in a concentrated mode, and airflow leakage at the end is reduced; multiple sets of inclined fan blades on the outer side wall of the annular cooling pipe generate airflow through rotation of the rotating shaft, air flow on the outer side of the rotor is enhanced, and in other words, heat dissipation of the ends of the rotor, heat dissipation of the middle of the rotor and heat dissipation of the outer side of the rotor are started; therefore, the heat dissipation effect of the doubly-fed motor rotor is improved.

The invention discloses a high-inertia multi-port composite motor for new energy grid connection. The high-inertia multi-port composite motor comprises a brushless doubly-fed motor, an axial permanent magnet motor and a magnetic gear structure. The brushless doubly-fed motor comprises a radial stator and a squirrel cage rotor, a power winding and a control winding are arranged in the stator and serve as a first electric port and a second electric port respectively, the axial permanent magnet motor comprises an axial stator and an axial permanent magnet rotor, and an armature winding is arranged in the stator and serves as a third electric port. The magnetic gear structure is arranged on the inner side of the squirrel cage rotor and the outer side of the rotating shaft, a brushless doubly-fed motor rotor magnetic field is used as a modulation magnetic source, the phase and amplitude of the magnetic field are adjustable, dynamic adjustment of the transmission ratio of the magnetic gear is achieved through a control winding, and electromagnetic and mechanical dual coupling is achieved. The equivalent rotational inertia of the composite motor is obviously higher than that of a single machine, stronger inertia support and frequency stability can be provided for a power grid in a new energy grid connection process, and the composite motor is provided with three independent electric ports, realizes multi-mode operation, and is compact in structure and high in power density.

The invention discloses an energy storage type phase modifier with a damping structure and a system, and belongs to the technical field of electric power equipment. The brush doubly-fed motor comprises a stator and a rotor. An air gap is formed between the stator and the rotor; three-phase symmetrical windings are arranged in the stator and the rotor; the damping structure is made of an electric conductor material and is arranged along the circumference of the notch of the rotor; the damping structure can be equivalent to a three-phase winding, and in the equivalent three-phase winding of the damping structure, each phase is self-short-circuited. The damping structure optionally comprises at least one of the following structures: a slot wedge made of an electric conductor, a cage bar and an end ring. According to the invention, the energy storage type phase modifier has the capabilities of suppressing the excitation current peak value and improving the short-circuit current on the premise of ensuring the high inertia supporting function, so that an excitation system is effectively protected, and the short-circuit voltage supporting capability of the motor is enhanced.

The application provides a brushless doubly-fed motor power winding inter-turn short circuit fault diagnosis method and system, and belongs to the technical field of driving equipment, which comprises the following steps: obtaining the fault characteristic frequency corresponding to each winding according to the basic electromagnetic relationship of the brushless doubly-fed motor; obtaining the signal of the fault phase; performing Fourier decomposition on the signal of the fault phase to obtain the current fundamental content of the current signal; performing discrete wavelet transform on the signal of the fault phase, extracting the detail signal according to the detail signal layer where the fault characteristic frequency is located, and performing Fourier transform again to extract the fault characteristic signal, thereby obtaining the harmonic content of the fault characteristic signal; when the current fundamental content of the power winding increases and the signal harmonic content obtained through the discrete wavelet transform increases, it is determined that the power winding has an inter-turn short circuit fault. The method utilizes the converter signal on the control winding side to diagnose the inter-turn short circuit fault of the power winding of the brushless doubly-fed motor without adding additional sensors, and effectively deals with the winding insulation fault of the motor caused by high voltage.

The invention provides a double-fed gravity energy storage system synchronous phase locking control method and device under unbalanced power grid voltage, and the method comprises the steps: obtaining related parameters of a double-fed motor, carrying out the band-pass filtering, Clarke transformation and dynamic filtering, generating a positive sequence component, generating a synchronous rotation angle through a phase-locked loop, and carrying out the dynamic filtering of the positive sequence component, thereby achieving the synchronous phase locking control of the double-fed gravity energy storage system. A rotor excitation voltage is generated through coordinate transformation, PI control and a composite regulator, and a switching signal is generated through space vector modulation after superposition excitation compensation, so that the rotating speed and reactive power stable control of the double-fed motor is realized, and the stable operation of the system when the power grid voltage is unbalanced is guaranteed.

The invention relates to a power prediction control method of a doubly-fed motor converter under a three-phase imbalance condition. The power prediction control method comprises the following steps: step 1, constructing a power prediction model of a three-phase voltage source converter under a three-phase power grid voltage imbalance state; 2, predicting a six-power component change value of the three-phase voltage source converter in the next control period based on the power prediction model; step 3, setting a value function and calculating the action duration of the voltage vector in the next control period by minimizing the function; and 4, realizing power switch control of the three-phase voltage source converter by adopting a space vector pulse width modulation technology. The method has the advantages that the active power, the reactive power and the harmonic components of the three-phase voltage source converter with the alternating-current-to-direct-current conversion function in the doubly-fed motor speed regulation system can be controlled under the condition that the three-phase power grid voltage is unbalanced, and the purpose of improving the efficiency and the control performance of the doubly-fed motor speed regulation system is achieved.

The invention discloses a doubly-fed motor loss and temperature digital twin model establishment method and system based on finite element simulation, and relates to the field of motor loss simulation, and the method comprises the steps: constructing a finite element simulation model of a doubly-fed motor; carrying out electromagnetic loss calculation based on the finite element simulation model; performing temperature loss calculation based on the finite element simulation model; and based on a result of the electromagnetic loss calculation and a result of the temperature loss calculation, constructing a digital twin model of the loss and the temperature of the doubly-fed motor. According to the method, a finite element simulation model of a motor is established, loss and temperature distribution data under limited working conditions are used for establishing a data set, a reduction method is used for extracting space information of a loss field and a temperature field, flow field characteristics of a three-dimensional flow field are described through a few modes and mode coefficient combinations, and the flow field characteristics of the three-dimensional flow field are analyzed. Meanwhile, the invention provides a simulation order reduction method in which the POD-KAN algorithm is combined with the ARBF algorithm, so as to achieve the rapid prediction of the physical quantity to be researched of the equipment.

The present invention discloses a method for parameter identification of a doubly-fed induction motor based on an adaptive extended Kalman filter, which addresses the problems of low accuracy and integrity, noise sensitivity, and other issues in the prior art of doubly-fed induction motor parameter identification. Based on the dq-axis flux equation and voltage equation of the doubly-fed induction motor, the present invention constructs a state space model with the stator and rotor dq-axis currents as state variables, expands the dimension of the state space model, utilizes the adaptive extended Kalman filter theory, and combines the rank criterion to determine the motor resistance R s 、R r and inductor L s , L r , L m The full observability of all parameters enables full parameter identification of the motor inductance and resistance, and enhances system robustness through adaptive adjustment of noise covariance. This invention effectively eliminates the effects of parameter coupling and improves identification accuracy. The adaptive noise suppression mechanism enhances anti-interference capabilities, meeting the requirements for dynamic online identification of doubly-fed motor parameters.

The invention discloses an inverse time limit overload protection method and device for a doubly-fed motor rotor winding. The method comprises the following steps: acquiring three-phase current of the doubly-fed motor rotor winding; rectifying the three-phase current signal of the rotor winding, and converting the three-phase current signal into a rectified current signal with six pulsating waveforms; converting an overload reference current; calculating a heat accumulation value in real time by adopting an inverse time limit heat accumulation equation based on the overload reference current and the rectified current; whether the heat accumulation value is larger than or equal to a heat accumulation threshold value or not is judged, and if yes, the protection system sends out a tripping signal. According to the technical scheme of the invention, the three-phase AC signal is rectified, and the overload heat accumulation value of the rectified output signal is calculated and discriminated by converting the overload reference current, so that the problem that the conventional inverse time limit protection method cannot meet the requirements of accuracy and timeliness when processing the extremely-low-frequency rotor current is solved. And accurate and timely inverse time limit overload protection is provided for the doubly-fed motor.

The application provides a non-invasive detection method and system for dynamic eccentricity fault of a brushless doubly-fed motor, and the method comprises the following steps: according to the basic electromagnetic relationship of the brushless doubly-fed motor, when the rotor dynamic eccentricity occurs, the fault characteristic frequency of the control winding connected with the frequency converter of the motor is calculated; the motor current is detected by using the FFT decomposition method, if the fault characteristic frequency signal appears, the current signal X(t) changing with time in the current transformer directly connected with the control winding in a certain time period of motor operation is recorded; the dynamic signal decomposition is performed on the current signal X(t), and the natural mode function of the current signal is obtained; the natural mode function of the current signal is fitted, and compared with the curve in the non-eccentric working state, if the fitted curve is offset compared with the curve in the non-eccentric working state, it is judged that the dynamic eccentricity fault occurs. The application detects the fault without adding additional sensors, and greatly improves the system reliability.

The invention relates to the technical field of production of brushless doubly-fed motors, and discloses a brushless doubly-fed motor assembly process, which comprises the following steps of: performing insulation treatment on the surface of a bent electromagnetic wire, and mounting the electromagnetic wire into a groove of a stator or a rotor; welding the end part, outside the groove, of the electromagnetic wire, winding an insulating tape on the welding part at a first set tension, and fixing the insulating tape to form a first insulating layer B; and forming a second insulating layer on the surface of the welding part with the first insulating layer B. When insulation treatment is carried out on a welding part, first set tension can be kept when an insulating tape is wound by utilizing an auxiliary tool, the situation that the insulating tape is loosened after being wound is prevented, and the situation that the winding quality cannot be guaranteed and the insulation effect is affected due to pure manual operation is avoided; moreover, a second insulating layer is also formed on the surface of the first insulating layer B, so that the insulation reliability is further ensured, the safety fault risk of the motor is reduced, and the maintenance cost is reduced.

The invention discloses a doubly-fed motor loss and temperature simulation system and method based on finite elements, and belongs to the technical field of motor simulation, and the system comprises a model construction module which is used for constructing a 3D motor model of a motor, carrying out the motion domain setting and rotor speed setting of the 3D motor model, and carrying out the current excitation of a winding of the 3D motor model; the first grid division module is used for carrying out surface layered grid division on a winding of the 3D motor model and calculating the layer grid depth; the loss set total value is used for dividing a winding in the 3D motor model into a plurality of winding areas, and the loss set total value of each winding area is obtained; the loss simulation module calculates the equivalent alternating-current resistance of the winding based on the loss set total value, and calculates the iron core loss in the motor based on the equivalent alternating-current resistance; the second mesh generation module is used for importing the 3D motor model into PeraSim and performing mesh generation on the 3D motor model; and the fluid thermal simulation module performs motor fluid thermal simulation by using the k-e turbulence model.

The embodiment of the invention relates to the field of fan testing, and discloses a doubly-fed motor testing method and system and a rotor testing method and system. In the invention, a stator winding of the doubly-fed motor is configured to be in an open circuit state, a rotor shaft of the doubly-fed motor is mechanically connected with a dragging device, and a rotor slip ring of the doubly-fed motor is electrically connected with a variable-frequency power supply device; the method comprises the following steps: controlling the dragging device to drive a rotor of the doubly-fed motor to rotate so as to apply a mechanical load, and controlling the variable-frequency power supply device to inject alternating current into the rotor so as to apply an electric heating load; wherein the mechanical load and the electric heating load of the rotor are mutually decoupled based on the open circuit state of the stator winding; and monitoring state parameters of the doubly-fed motor. Therefore, the problems that the test cost is high, the energy consumption is large, the test working condition simulation of a single part is not real, and the fatigue failure risk of the rotor system cannot be fully identified in the prior art are solved.

The invention relates to the technical field of large-scale gravity energy storage system control, in particular to a gravity energy storage system charging and discharging switching method based on a doubly-fed motor and model prediction, and the method comprises the steps: obtaining a smooth non-overshoot power reference trajectory based on a five-order S-shaped curve algorithm through the real-time operation data of a power grid; obtaining an optimal control instruction sequence in a future period according to the smooth non-overshoot power reference trajectory; acquiring a switching signal of the power converter based on a flux linkage directional vector control strategy by using the optimal control instruction sequence in the future time period; according to the power converter switching signal, charging and discharging switching of the gravity energy storage system is carried out, through the multi-step look-ahead optimization capability of a model prediction control algorithm and in combination with a smooth reference trajectory generation method of an S-shaped curve, power and torque abrupt changes in the mode switching process are eliminated fundamentally, and the mode switching efficiency is improved. The key technical problem in charging and discharging mode switching of the gravity energy storage system is effectively solved, and important technical support is provided for large-scale application of the gravity energy storage technology.

The invention provides an efficient power generation system for a low wind speed section of a doubly-fed generator, and the system comprises a stator short-circuit contactor which is connected between a stator of the doubly-fed generator and a stator grid-connected contactor. When the wind speed is low and the rotating speed of the generator is lower than a doubly-fed power generation range, a motor stator is short-circuited through a stator short-circuit contactor, and a unit is grid-connected to generate power in an asynchronous motor mode. And when the wind speed is high and the rotating speed of the generator enters a doubly-fed power generation range, the stator short-circuit contactor is disconnected, and the unit performs grid-connected power generation in a doubly-fed motor mode. The stator short-circuit contactor is connected between the stator of the doubly-fed generator and the stator grid-connected contactor, when the rotating speed of the low-wind-speed generator is lower than the doubly-fed power generation range, the stator of the motor is short-circuited through the stator short-circuit contactor, and the unit is in grid-connected power generation in an asynchronous motor mode. The power generation capacity of the wind turbine generator set under the low-wind-speed condition can be fully released, the overall power generation benefit of a wind power plant is improved, and efficient and stable operation of the wind turbine generator set under the low-wind-speed condition is achieved.

The utility model relates to the technical field of power grids, and discloses a horizontal flywheel energy storage system, which is characterized in that a flywheel energy storage module is rigidly or flexibly connected with a rotor of a double-fed motor through a primary connector; a stator of the double-fed motor is electrically connected with an alternating current power grid; the system controller is electrically connected with the flywheel energy storage module, the primary connector and the double-feed motor; the flywheel energy storage module, the first-stage connector and the double-fed motor are all horizontally arranged, and the flywheel energy storage module is sealed in a vacuum mode. By adopting the horizontal arrangement, a larger and heavier flywheel rotor can be supported, so that the rotational inertia of the flywheel rotor is increased, and the capability of providing the rotational inertia for an alternating current power grid by the system is further improved; vacuum sealing is adopted, air resistance of a flywheel rotor of the flywheel energy storage module is reduced, energy conversion efficiency is improved, energy loss caused by air friction is avoided, the service life of the flywheel energy storage module is prolonged, corrosion of external air is avoided, and corrosion and oxidation of the flywheel rotor are reduced.

The application discloses a motor control method based on real-time monitoring and belongs to the technical field of double-fed motor control. The application obtains power generation data of a double-fed motor, controls an image acquisition device to shoot brush image data of the double-fed motor, determines temperature state information of the brush according to the brush image data and an image recognition algorithm, generates a motor monitoring result according to the temperature state information and the power generation data, and controls the double-fed motor according to the motor monitoring result, so that the detection efficiency of the brush is improved, and the beneficial effect of reducing the risk of double-fed motor operation is achieved.

The invention provides a composite rotor brushless doubly-fed motor with cage bars with unequal areas, and belongs to the technical field of motors, the brushless doubly-fed motor comprises a composite rotor and a stator, an air gap is arranged between the composite rotor and the stator, the composite rotor comprises a salient pole reluctance rotor and conductive cage bars, the conductive cage bars are embedded in the axial direction of the salient pole reluctance rotor, and the stator and the salient pole reluctance rotor are connected through the air gap. The conductive cage bars comprise a first group of cage bars, a second group of cage bars and a third group of cage bars, and the three groups of conductive cage bars are unequal in area; the stator comprises a stator core and windings, the windings are wound on the stator core in a double-layer arrangement mode, the windings comprise power windings and control windings, the power windings are arranged on the upper layer of the stator core and close to the air gap, and the control windings are arranged on the lower layer of the stator core and away from the air gap. The combined type rotor brushless doubly-fed motor adopting the cage bars with the unequal areas solves the problems that a traditional brushless doubly-fed motor is insufficient in rotor magnetic field coupling capacity, high in air-gap magnetic field harmonic content and low in electromagnetic energy conversion efficiency.

The invention belongs to the technical field of phase modifier control, and particularly relates to a system suitable for starting a phase modifier and a control method.The system comprises a brushless doubly-fed motor or a doubly-fed motor coaxially connected with a high-capacity phase modifier, and the motor comprises a set of high-voltage windings and a set of low-voltage windings; the high-voltage winding and the low-voltage winding are respectively connected with a high-voltage power grid and a low-voltage power grid through contactors; the contactor connected with the low-voltage winding is connected with an inversion unit of a low-voltage four-quadrant frequency converter, and the inversion unit of the low-voltage four-quadrant frequency converter is connected with a step-down transformer. The method aims to assist in solving a series of problems existing in the turning, starting and synchronous grid connection processes of the current high-capacity phase modifier, and meanwhile, corresponding control strategies are formulated according to working conditions such as restarting at any rotating speed in the turning, static state starting and stopping processes of the phase modifier, so that the reliability of a phase modifier system is improved.

The invention provides a double-fed gravity energy storage system synchronous phase locking control method and device. The method comprises the steps that stator three-phase voltage, a rotor position angle, stator current and rotor current of a double-fed motor are acquired; after carrying out band-pass filtering on the stator three-phase voltage, converting the stator three-phase voltage into an alpha-beta static coordinate system to obtain alpha-beta axis voltage components; the stator current and the rotor current are also converted to the coordinate system to generate alpha-beta axis current components. Based on the alpha-beta axis voltage component, a phase-locked loop is utilized to synchronize a power grid phase, and a synchronous rotation angle is generated; and converting the alpha-beta-axis current component into a dq rotating coordinate system to obtain stator dq current and rotor dq current. The method comprises the following steps: generating a d-axis current reference value and a q-axis current reference value of a rotor according to a rotor rotating speed error and a voltage demand, calculating a voltage compensation value through a proportional-integral controller, generating a rotor voltage reference value, and finally generating a converter switching signal through space vector modulation to realize power control. The method can improve the stability and efficiency of the system and enhance the anti-interference capability.

The invention provides a doubly-fed motor control method and device based on a residue method, and relates to the field of power system maintenance, and the method comprises the steps: carrying out the blocking processing of a predetermined actual value of the AC / DC current of a doubly-fed motor rotor, and obtaining a blocking current; performing phase compensation on the blocking current by using a pre-constructed residue damping controller to obtain a phase compensation current; wherein the residue damping controller is constructed according to residues in a system transfer function; performing gain amplitude limiting processing on the phase compensation current to obtain a compensation value of alternating current and direct current of the doubly-fed motor rotor; and controlling the doubly-fed motor according to the target value of the AC / DC current of the doubly-fed motor rotor and the compensation value of the AC / DC current of the doubly-fed motor rotor. According to the method, the parameters of the damping controller can be optimized according to the residue information of the system state equation so as to suppress the subsynchronous oscillation phenomenon of the system.

The application discloses a torque ripple suppression method for a brushless doubly-fed motor, which comprises the following steps: firstly, a current loop and a rotating speed loop model of the brushless doubly-fed motor are established; then, an active disturbance rejection controller is established according to the current loop and the rotating speed loop model, wherein the active disturbance rejection controller comprises a d-axis improved current controller, a q-axis current loop active disturbance rejection controller and a rotating speed loop active disturbance rejection controller; the d-axis improved current controller comprises a d-axis current loop active disturbance rejection controller and an improved repetitive controller connected in parallel with the d-axis current loop active disturbance rejection controller; and then, the brushless doubly-fed motor is controlled by using the established active disturbance rejection controller. The active disturbance rejection controller is combined with the improved repetitive controller, the extended state observer is used for disturbance estimation, and the disturbance contains a coupling term, so that the current dynamic response is faster, and the parameter robustness is stronger; meanwhile, the improved repetitive controller connected in parallel can overcome the high-frequency current harmonics introduced by uncontrolled rectification, and can also limit the dynamic response to not produce excessive overshoot when the working condition is suddenly changed.

The invention belongs to the technical field of wind power generation, and relates to a double-fed motor vertical slip ring frame mounting structure and application thereof. The structure comprises: a slip ring chamber vertically fixed on a frame, wherein the slip ring chamber comprises a slip ring and a slip ring brush holder; the upper part of the slip ring is provided with a grounding ring, the grounding ring is connected with a motor rotating shaft, the grounding ring is provided with a mounting spigot surface for mounting an encoder assembly, the encoder assembly is fixed above a grounding brush through a fastener, and the grounding brush is pressed on the grounding ring; the bottom of the slip ring is also provided with three rotor outgoing line connecting blocks which are used for fixedly connecting the rotor outgoing line with the slip ring brush carrier. An insulating plate is further installed below the slip ring brush holder, and a sealing piece is arranged between the insulating plate and the slip ring brush holder. The slip ring brush holder can be applied to the fields of vertical axis wind power generation, pumped storage power generation and the like, can effectively solve the installation problem of the slip ring brush holder in the vertical installation process of the doubly-fed motor, is favorable for adjusting the power factor of a power grid and enhancing the stability of the power grid, and expands the application range of the doubly-fed motor.

The application discloses a full-order terminal sliding mode control method for a brushless doubly-fed motor independent power generation system, and belongs to the field of motor control. The application solves the problem that the traditional full-order terminal sliding mode control algorithm does not simultaneously consider the matching and non-matching uncertainty caused by motor parameter perturbation in the motor model, resulting in low system output voltage precision, poor system anti-interference ability and control effect. According to the brushless doubly-fed motor mathematical model, the application considers the matching and non-matching uncertainty caused by brushless doubly-fed motor parameter perturbation, determines the voltage loop state equation of the non-matching power winding outer ring voltage subsystem and the current loop state equation of the matching control winding inner ring current subsystem, and designs corresponding inner and outer loop full-order terminal sliding mode controllers for the subsystems to compensate the uncertainty, so that the tracking error of the power winding voltage amplitude converges to zero, and the tracking error of the control winding current amplitude converges to zero. The application is mainly suitable for independent power generation control when the brushless doubly-fed motor is connected to a balanced load.