53 results about "Rotor side converter" patented technology

The invention discloses an impedance characteristic remodeling method, device and equipment and a medium, and is applied to the field of wind turbine generators. Wherein the corresponding rotor reference current is determined according to the electromagnetic reactive power, the active power and the corresponding power reference value; correcting the rotor current according to the rotor reference current by adopting a virtual admittance control mode, and generating a corresponding rotor voltage given value; sequentially performing differentiation, filtering and signal extraction processing on the rotor reference current and the rotor current to obtain an impedance remodeling signal; and correcting the rotor voltage given value based on the impedance remodeling signal so as to enable the corrected rotor voltage given value to serve as the control voltage of a rotor side converter in the medium-voltage doubly-fed wind turbine generator after impedance characteristic remodeling. The virtual admittance control mode and the impedance remolding signal mode are adopted to suppress the negative resistance effect of the rotor side converter in the medium-voltage doubly-fed wind turbine generator under voltage disturbance, and therefore the damping effect on external excitation in the sub-super-synchronous frequency band and the high frequency band is higher.

The invention provides a zero-voltage ride-through control method for a self-synchronizing voltage source doubly-fed wind turbine generator, which comprises the following steps that: when the self-synchronizing voltage source doubly-fed wind turbine generator is in a transient state, a grid-side converter adopts vector control, and a rotor-side converter adopts additional virtual impedance and annular current limiting; the transient overcurrent of the grid-side converter and the rotor-side converter can be effectively suppressed, so that the continuous operation capability of the wind turbine generator in the zero-voltage ride-through period can be maintained; meanwhile, by improving the transient capacity and the transient reactive current amplitude of the converter, the transient voltage supporting capacity of the wind turbine generator during the zero voltage ride-through period can be effectively provided; when the self-synchronizing voltage source doubly-fed wind turbine generator set is in a transient state, overvoltage of direct-current bus voltage is limited by a Chopper circuit, active-priority current amplitude limiting control is adopted by a grid-side converter, parameters of a current inner ring PI controller of a rotor-side converter are optimized, energy balance of a direct-current side can be achieved in the zero-voltage ride-through period, and stability of the direct-current bus voltage is maintained.

The invention provides a damping boosting method for a high-inertia energy storage type synchronous phase modifier based on stator voltage feed-forward compensation, which is used for respectively calculating d-axis compensation modulation voltage and q-axis compensation modulation voltage of a grid-side converter and a rotor-side converter, and is used for enhancing small-disturbance stability in an HIESSC wide-slip operation range. Under a weak power grid connection condition, the method feeds HIESSC stator voltage disturbance forward to a rotor side converter and a grid side converter controller output voltage through a transfer function, so that reduction of a negative resistance region of HIESSC impedance characteristics can be realized, and adverse effects of grid-connected point voltage disturbance are inhibited, thereby improving the HIESSC impedance characteristics and enhancing small disturbance stability of an HIESSC grid-connected system.

The invention discloses a single-loop droop control method and system for a wind generating set, and the method comprises the following steps: constructing a doubly-fed fan-power converter-power grid three-module coupling model, and completing the dynamic adaptation of the characteristics of a doubly-fed fan of a single-loop droop control architecture without inner-loop current control; based on the input signal-model collaborative integration body and the adaptive architecture, MIMO-GBC is adopted to analyze a phase margin and a resonance peak value of an open-loop transfer function matrix eigenvalue of a dynamic small signal model, and double risks are identified in a full slip rate interval; aiming at the resonance risk, a current induction type virtual impedance strategy is adopted; aiming at insufficient phase margin, adopting a transient phase calibration strategy; and according to the real-time slip ratio of the DFIG and the stator power change, inter-partition linkage optimization is carried out on the virtual resistance and the phase calibration angle so as to minimize a dual-power step response fluctuation square mean value, a parameter setting period and a rotor side converter control period are synchronously matched, and all-working-condition stable control is realized.

The invention provides a doubly-fed wind turbine generator sub-hyper-synchronous frequency band dominant parameter identification method and system, and the method comprises the steps: dividing a doubly-fed wind turbine generator into two subsystems: a grid-side converter GSC and a rotor-side converter RSC, respectively building impedance analysis models, connecting the two subsystems in parallel at a PCC, and carrying out the impedance analysis of the two subsystems; the port impedance of the doubly-fed wind turbine generator is equivalent to the parallel connection of the grid-side converter impedance and the rotor-side converter impedance; respectively taking the control parameters as variables, scanning in a range of 5Hz-100Hz at a step length of 1Hz, and calculating partial derivatives of the port impedance amplitude of the doubly-fed wind turbine generator to each control parameter to obtain a sensitivity index; screening out the control parameters of which the sensitivity indexes exceed a preset threshold value in the frequency band width of continuous N step lengths as the guide parameters of the frequency band; and finally, sorting the screened control parameters according to sensitivity indexes, and determining the first M control parameters which have the maximum influence on the frequency band as dominant parameters of the synchronous frequency band as subsequent setting priorities.

The invention discloses a multi-frequency subsynchronous oscillation self-adaptive suppression method for a doubly-fed wind power generation system, and belongs to the technical field of power system stability control. The invention aims to solve the problem that an existing method only suppresses single oscillation frequency and cannot guarantee stable operation of a wind turbine generator and a power grid. Comprising the steps that discrete current signals of the double-fed wind power generation system are collected, a sparse Fourier observer is used for sequentially conducting frequency spectrum rearrangement, window function filtering, frequency domain down-sampling and fast Fourier transformation, positioning circulation and valuation circulation on the discrete current signals, and the frequency and amplitude of subsynchronous oscillation components of the double-fed wind power generation system are obtained; a parallel multi-frequency self-adaptive wave trap is connected into a rotor side converter control loop of the doubly-fed wind power generation system, parameters of the wave trap are dynamically adjusted, and a suppression signal opposite to a subsynchronous oscillation component is output to filter out the subsynchronous oscillation component. According to the invention, the subsynchronous oscillation of the power system can be effectively suppressed under the condition of high-proportion new energy access.

The application discloses a double-fed wind farm subsynchronous oscillation suppression method based on intelligent learning and predictive control. First, based on double-fed wind farm dominant oscillation mode analysis, double-fed wind turbine rotor side converter outer ring damping control prediction model and inner ring damping control prediction model are analyzed; a damping optimization function approximator is constructed based on a robust model predictive control, and a double-fed wind turbine outer ring damping optimization control module and an inner ring damping optimization control module are established; then, based on Q learning optimization, optimal control laws of the double-fed wind turbine outer ring damping optimization control module and the inner ring damping optimization control module are solved, and the optimal control laws are stored based on data cubes; finally, the double-fed wind turbine outer ring damping optimization control module and the inner ring damping optimization control module are incorporated into the inner and outer ring control of the rotor side converter, and double-fed wind farm subsynchronous oscillation suppression is realized. The application considers the uncertain influence of the control system parameters, can realize double-fed wind farm subsynchronous oscillation suppression, and avoids oscillation propagation.

The application discloses a kind of based on q-axis voltage orientation's doubly-fed fan rotor side converter control method, the method is as follows: controller will the mechanical power of wind turbine output as active reference signal, obtain generator stator voltage and stator rotor current by voltage and current sensor, after coordinate transformation, stator voltage is aligned to q-axis, the active power and reactive power of stator side output are calculated, then by feedforward compensation and decoupling control, generate rotor voltage modulation signal under dq axis, by coordinate inverse change is sent to SVPWM link input end, exports the switch tube control signal of doubly-fed generator machine side converter, to realize the independent control of active power and reactive power by rotor current.It can effectively solve the problems such as large flux linkage measurement error, active and reactive power coupling, limited reactive power compensation in traditional stator flux linkage orientation control, without observing stator flux linkage, can improve the power supply quality of doubly-fed wind power system.

The invention provides a doubly-fed induction stator current control method and system based on a resonance controller, and the method comprises the steps: collecting a stator current and a rotor current of a doubly-fed induction generator in real time, and separating a negative-sequence component and a harmonic component of the stator current; inputting the separated negative sequence component and harmonic component into a composite resonance controller, and outputting a compensation voltage signal; a compensation voltage signal output by the composite resonance controller and a fundamental wave voltage instruction output by a traditional PI controller are superposed, and a total voltage instruction of the rotor side converter is generated; after the total voltage instruction is subjected to PWM modulation, an IGBT switching device of a rotor side converter is driven, suppression of a negative sequence component and harmonic waves is achieved, and stator current is balanced. The second-order resonance controller is adopted for the 100 Hz negative sequence component, the sixth-order resonance controller is adopted for the fifth-order harmonic component and the seventh-order harmonic component, and the operation performance of the doubly-fed wind turbine generator under the condition of unbalanced power grid voltage is improved through a composite control strategy.

The present invention relates to the field of wind turbine control technology, and more particularly to a method for suppressing stator current oscillations during fault ride-through and recovery of a doubly-fed wind turbine. The present invention addresses the fault ride-through and recovery processes of a doubly-fed wind turbine, coordinates the switching of a stator-side fault current limiter, and aims to minimize the amplitude of the stator current oscillation component of the doubly-fed wind turbine. The method solves for current optimization control reference values ​​of the rotor-side converter and the grid-side converter during the fault ride-through and recovery processes, thereby fully suppressing stator current oscillations of the doubly-fed wind turbine during both the fault ride-through and fault recovery processes.

The invention discloses a new energy positive and negative sequence voltage coordinated optimization method adaptive to high-power fault impact, which comprises the following steps of: constructing an optimal unbalanced voltage suppression model of a doubly-fed wind turbine generator under an asymmetric fault of a power grid, and taking the minimum voltage unbalance degree of a grid-connected point as a target function by the model to suppress the optimal unbalanced voltage of the doubly-fed wind turbine generator under the asymmetric fault of the power grid; the capacity constraint of the rotor side converter and the synchronous stability constraint of the system are included; based on the optimal unbalanced voltage suppression model, reconstructing a double-sequence synchronous rotating coordinate system; carrying out convexity processing on the reconstructed model, relaxing the capacity constraint of the rotor-side converter into a second-order cone form, and introducing an auxiliary variable to convert a target function and related constraints into a standard second-order cone programming problem; and solving the second-order cone programming problem, obtaining an optimal voltage dynamic control instruction, and controlling the new energy generator set. According to the method, the inter-sequence coupling effect can be accurately considered, so that the optimal suppression of the voltage imbalance is realized on the premise of ensuring the safety and stability of a machine-network system.

The invention provides a doubly-fed fan rotor side converter current loop LADRC parameter setting method and device. The method comprises the steps that control gain parameters of a doubly-fed fan rotor side converter current loop LADRC are acquired; increasing the bandwidth of the linear expansion state observer and the bandwidth of the controller in proportion until the noise causes the output fluctuation or oscillation of the system; finely adjusting the bandwidth of the linear expansion state observer and the bandwidth of the controller; finely adjusting the proportional gain parameter and the second linear parameter until the closed-loop dynamic performance of the system reaches the expected dynamic performance, and recording an undetermined parameter set under the current control gain parameter; after the control gain parameter is changed, the steps are repeated to obtain multiple sets of undetermined parameters; and LADRC parameters meeting the requirements are selected according to a preset standard. The parameter setting method is simple and easy to implement, gives full play to the immunity and damping capacity of LADRC, and is superior to an existing additional damping control strategy.

The application belongs to the technical field of power electronic converter control, and discloses a control method of a grid-connected double-fed asynchronous wind power generation system with power control capability, which comprises a control process of a rotor-side converter and a control process of a grid-side converter, wherein the rotor-side converter forms a grid-connected characteristic at the motor stator winding port and controls the energy injected into the DC bus capacitor; the grid-side converter maintains the input and output energy balance of the DC bus capacitor, thereby controlling the DC bus capacitor voltage to be constant; the control process of the rotor-side converter comprises a frequency support control loop, a power control loop, a voltage and current inner loop and pulse width modulation control, and the control process of the grid-side converter comprises a DC voltage control loop, a reactive power control loop, an AC current control loop and pulse width modulation control. The application can realize the grid-connected power dynamic index and provide the output power control capability.

The application discloses a kind of inhibiting overvoltage disturbance of double-fed wind turbine's collaborative control method belonging to wind power system control field.The rotor side converter control law of double-fed wind turbine is deduced by defining double-fed wind turbine machine side macro variable, the rotor side converter control law of double-fed wind turbine is deduced by defining double-fed wind turbine network side macro variable, and collaborative controller is constructed, above-mentioned control law replaces the current inner ring structure of classic double-loop control, parameter vector is selected using the parameter selection method of collaborative controller, and the collaborative control of inhibiting overvoltage disturbance of double-fed wind turbine is realized.The method disclosed by the application can reduce the influence of overvoltage impact on DFIG, reduce the reactive current output by DFIG, achieve the effect of inhibiting overvoltage, ensure the stable operation of DFIG, and has significant advantages in inhibiting overvoltage peak value and peak value duration and reducing electrical quantity overshoot, and has good control effect on high-dimensional nonlinear wind power system.

The invention relates to the technical field of offshore wind power inertia control, in particular to an offshore wind power inertia supporting method considering frequency deviation. According to the method, virtual inertia control is added to offshore wind turbine generator rotor side converter control, and rotation kinetic energy stored in a fan is temporarily released to compensate for active power loss of a system; according to the method, a self-defined virtual inertia coefficient is calculated by considering the participation of a fan in inertia support potential, rapid system inertia support is actively provided, active inertia support control of an offshore wind plant is realized under different operation conditions, and the virtual inertia coefficient is fully amplified under high-frequency deviation to make up for active power loss and suppress frequency fluctuation; under the low frequency deviation, the virtual inertia coefficient is appropriately amplified to compensate the active power vacancy of the system, and the problem of system frequency instability is avoided at the same time.

This invention discloses a transient stability modeling method for doubly-fed induction generator (DFIG) wind turbines that considers the characteristics of dual-port grid connection. In constructing the mathematical model, this method considers the coupling relationship between the input voltages of the phase-locked loops (PLLs) of the rotor-side converter and the grid-side converter, using the mutual impedance voltage drop as a bridge for the mutual coupling of the two PLLs. The constructed fourth-order transient synchronization model, compared to the traditional second-order transient synchronization model based on a single PLL, can reveal the transient synchronization and stability mechanism of DFIG wind turbines more deeply.

This application belongs to the field of new energy technology, specifically disclosing a multi-objective cooperative transient control method for an energy storage-type AC excitation synchronous condenser. It includes: determining the fault stage of the energy storage-type AC excitation synchronous condenser in real time based on real-time operating parameters, and dynamically determining the control objective; considering the controllability constraints of the rotor-side converter output voltage, rotor current safety constraints, and flux linkage stability decay constraints, calculating the port positive-sequence inductance value, negative-sequence inductance value, and transient inductance value corresponding to the control objective at the current stage; and substituting the obtained port positive-sequence inductance value, negative-sequence inductance value, and transient inductance value into the solution to obtain the corresponding current command value. This application fully considers the different transient characteristics at different stages of fault development and sets differentiated optimization objectives to achieve multi-objective cooperative control throughout the fault process; it introduces the port three-sequence inductance as a decision variable, and by dynamically adjusting the inductance value, achieves multi-objective cooperative fault ride-through throughout the entire process of the AC excitation synchronous condenser.

The application discloses a method for suppressing subsynchronous resonance of a doubly-fed wind turbine based on additional electromagnetic torque, and the method comprises the following steps: constructing a transfer function between a rotor-side electromagnetic torque variation and a rotor speed disturbance by a flux linkage equation of a three-phase asynchronous motor and a rotor-side electromagnetic torque expression of the three-phase asynchronous motor; deriving a generation mechanism of the subsynchronous resonance from a physical layer according to the transfer function; and adding a subsynchronous resonance damping control strategy for additional electromagnetic torque of a target doubly-fed wind turbine in a d-axis controller of a rotor-side converter according to the generation mechanism of the subsynchronous resonance, so that the target doubly-fed wind turbine generates an electromagnetic torque which is opposite in phase to the rotor speed disturbance, thereby effectively suppressing the subsynchronous resonance of a power transmission system for transmitting wind power from the doubly-fed wind turbine to outside through a series compensation transmission line.

The application provides a high-inertia double-fed motor unit and a control method thereof. The corresponding control method comprises the following steps: when an alternating current system in which the high-inertia double-fed motor unit is located is in a normal operation state, determining a first active instruction value of a rotor side converter according to a pre-set rotating speed instruction value of a double-fed motor; when the alternating current system is in a fault operation state, determining a second active instruction value of the rotor side converter according to a rated power of the double-fed motor; when the alternating current system is switched from the fault operation state to the normal operation state, determining a third active instruction value of the rotor side converter according to a current rotating speed of the rotor of the double-fed motor. The application relies on the double-fed motor with a high rotating inertia rotor to reserve high rotor kinetic energy, and provides active frequency support for the system by releasing the rotor kinetic energy when the system fails.

The application discloses a power coordination recovery control method for inhibiting repeated low voltage ride through of a doubly-fed wind turbine. The application proposes to coordinate the recovery slope of active current and reactive current aiming at the repeated low voltage ride through problem of the doubly-fed wind turbine after fault clearance. Firstly, a phase-locked loop second-order underdamped model is established to estimate the peak time and valley time in the voltage recovery process; then, the current recovery expression is substituted into the grid connection point voltage equation to construct a voltage constraint inequality, so that the peak time does not trigger high voltage ride through and the valley time does not trigger low voltage ride through; finally, the feasible range of the active recovery slope and the reactive recovery slope is determined according to the constraint inequality, the optimal active and reactive current recovery slope is determined by combining the current limiting or recovery time matching constraint, and the current reference instruction is input to the rotor side converter. The application can effectively inhibit voltage oscillation when exiting the low voltage ride through stage and improve the transient stable operation ability of the wind turbine under weak grid conditions.

The invention discloses a method, a system, equipment and a medium for adaptively improving an inertial response effect and frequency damping based on a phase-locked error, and relates to the technical field of power grid inertial response, and the method comprises the following steps: representing the phase-locked error through a q-axis voltage component obtained through coordinate transformation of a grid-connected point three-phase voltage signal; inputting the q-axis voltage component into an inertia control link to obtain an additional torque or active power instruction value; adaptively adjusting the damping coefficient T based on the absolute value of the q-axis voltage component; superposing the additional torque or active power instruction value with active power or torque instruction values generated in other links to obtain a target instruction value at the next moment; and d-axis and q-axis components of the excitation voltage are calculated through a proportional-integral controller, and a control signal of the rotor-side converter is generated through inverse coordinate transformation. A q-axis component in three-phase voltage of a grid-connected point is extracted to accurately represent a phase locking error, and in combination with adaptive damping adjustment, rapid identification and active response to power grid frequency disturbance are realized.

The invention discloses a doubly-fed wind power converter and a control method thereof. The control method comprises the following steps: acquiring current of a grid-connected point and rotor current of a rotor side; calculating a deviation current between the current of the grid-connected point and the rotor current, and introducing the deviation current as a feedforward quantity into a current loop of a rotor-side converter; and generating a control signal for the rotor-side converter based on the given current output by the power loop and the feed-forward quantity. According to the invention, the dependence on motor parameters is effectively reduced, and the control precision and the parameter error-tolerant rate of the excitation current are improved.

This invention presents a crowbar reversal strategy based on rotor fault current and grid voltage. This method is an improved crowbar protection strategy, adding a series protection resistor between the original crowbar circuit and the rotor-side converter. It employs a fast switching criterion based on grid connection point voltage vector drop detection, which can simultaneously limit the current surge flowing through the RSC and the rotor windings. For different fault clearing times, a crowbar reversal strategy based on rotor fault current and grid voltage is designed, which can reduce the crowbar activation time to a certain extent, thereby reducing the absorbed reactive power, and also offers greater flexibility.

The invention relates to the technical field of pumped storage, and particularly discloses a double-fed pumped storage low-voltage ride-through method based on a dynamic demagnetization coefficient, and the method comprises the following steps: detecting whether a power grid has a low-voltage fault or not; when a low-voltage fault is detected, determining a demagnetization coefficient initial value according to a stator flux linkage transient component; based on the attenuation characteristic of the transient component of the stator flux linkage, a demagnetization coefficient dynamically changing along with time is calculated; generating a rotor current reference value according to the dynamic demagnetization coefficient; according to the method, the dynamic distribution strategy of the capacity of the rotor side converter during the fault period is optimized, the demagnetization coefficient is calculated and adjusted in real time based on the transient component of the stator flux linkage through dynamic demagnetization coefficient control, the generated dynamic demagnetization current can effectively inhibit the overcurrent and overvoltage of the rotor, and the over-current and over-voltage of the rotor can be effectively inhibited along with the attenuation of the transient component. And the capacity is gradually released to provide timely reactive power support for the power grid, so that the safety of the converter is protected, and the power grid voltage recovery is assisted.

The invention discloses a staged grouping method and system for a whole wind power plant fault process and electronic equipment, and the method comprises the steps: carrying out the grouping equivalence of a whole wind power plant group based on a slip ratio and an rsc inner ring proportionality coefficient of a rotor-side converter in an unreacted stage of a converter; when at least one fan action enters a crowbar protection Crowbar input-asynchronous machine stage, performing initial classification on a whole fan group based on whether the fan action exists, and performing grouping equivalence based on a slip ratio and an inner ring proportionality coefficient of a rotor side converter on the basis of an initial classification result; and when the Crowbar exits and all the fans return to the rsc control stage, keeping the grouping result until the fault is removed. According to the method, the wind power plant short-circuit current dynamic characteristics in the whole fault process can be accurately described, accurate calculation of the wind power plant short-circuit current is achieved, and technical support is provided for high-proportion new energy power system short-circuit calculation and wind power plant equivalent grouping.

The present application belongs to the technical field of power system oscillation suppression, and specifically discloses an oscillation suppression method and system based on high-inertia energy storage type phase modifier impedance remodeling, which comprises the following steps: identifying a target suppression frequency band; obtaining the active power signal of a grid-connected new energy unit or new energy station, and performing band-pass filtering to obtain the subsynchronous and / or supersynchronous oscillation component of the target suppression frequency band; performing asymmetric complex number lead correction on the oscillation component; after amplitude shaping and safety limiting of the phase-compensated signal, the signal is injected into the rotor-side converter power outer ring of the high-inertia energy storage type phase modifier as an additional control signal to form an additional power deviation; the deviation is output as a rotor-side current reference value after PI regulation, and then a damping power opposite to the oscillation component is formed on the stator side to remodel the equivalent output impedance of the point of common coupling. The present application can suppress the subsynchronous and / or supersynchronous oscillation of the new energy station.

The application belongs to the technical field of wind power generation control, and particularly relates to a power equivalent energy storage type double-fed fan double-virtual synchronous machine control method and system. According to a scheduling instruction or a preset condition, the method determines a unit equivalent inertia target and a unit primary frequency droop coefficient. Through rotor speed, energy storage state of charge, current active power of a grid-side converter and grid-side converter power, the inertia support bearing amount of a stator channel and a grid-side converter channel and the primary frequency droop coefficient distribution proportion are determined, and the unit equivalent inertia target is decomposed into respective equivalent inertia targets of the two channels. The power response equivalent method is used to determine the stator channel virtual synchronous machine control parameter and the grid-side converter channel virtual synchronous machine control parameter, and the rotor-side converter and the grid-side converter are controlled accordingly. The stability and controllability of the active power response of the wind turbine during the frequency support period under different operating conditions can be improved.

The application discloses a two-stage frequency modulation method, device, equipment and medium of a variable-speed pumped storage unit, and belongs to the field of power system operation control, and comprises the following steps: dividing a primary frequency modulation process of the unit into first-stage frequency modulation control and second-stage frequency modulation control; when the frequency of a power system deviates and triggers a primary frequency modulation response of the unit, the first-stage frequency modulation control is performed; the electromagnetic torque is adjusted under operation constraints through coordinated control of a rotor-side converter and guide vanes; the switching condition is determined according to the frequency variation characteristics of the system, and the first-stage frequency modulation control is switched to the second-stage frequency modulation control; the frequency support of the unit to the power system is maintained, the rotor speed is adjusted, and the rotor speed is restored to the rated speed or a stable operation interval. The application can coordinate the improvement of the frequency regulation performance of the power system and the operation safety of the variable-speed pumped storage unit without relying on additional energy storage devices, and is suitable for a power system with a high proportion of new energy access.

The application discloses an alternating-current excitation phase modifier transient performance improving method and system, wherein the method is applied to a rotor side converter in an alternating-current excitation phase modifier excitation system, and the method comprises the following steps: constructing a double closed-loop control model of a power outer ring and a current inner ring according to a mathematical model of the alternating-current excitation phase modifier excitation system; based on the double closed-loop control model, respectively outputting reference values of d-axis rotor current and q-axis rotor current according to reference values of active power and reactive power by using PI controllers on the d-axis and the q-axis of the power outer ring, and respectively outputting d-axis rotor voltage and q-axis rotor voltage according to the reference values of the d-axis rotor current and the q-axis rotor current by using linear active disturbance rejection controllers on the d-axis and the q-axis of the current inner ring; and generating pulse width modulation waves according to the d-axis rotor voltage and the q-axis rotor voltage and outputting the pulse width modulation waves to the alternating-current excitation phase modifier. Through the application, the rapid stability and control precision of current control of the alternating-current excitation phase modifier in a large-scale new energy station under power grid voltage failure are effectively improved.

The application discloses a kind of not controlled rectification sends out lower doubly-fed fan fast power regulation control method and device.The application is aimed at the problem of long power regulation link and slow dynamic response of existing not controlled rectification sends out lower doubly-fed fan, constructs active power-air gap flux linkage control and reactive power-frequency control loop, generates air gap flux linkage amplitude and frequency / phase reference value;According to the flux linkage equation of doubly-fed fan, obtain rotor current reference value;According to the discrete mathematical model of doubly-fed fan, calculate the predicted value of rotor current and stator active power under different switching states;Select rotor current, stator active power as the control item of cost function, find out the switching state that makes the cost function minimum, and apply it to the rotor side converter of doubly-fed fan in the next control period.The application method is suitable for power control of not controlled rectification sends out lower doubly-fed fan or similar topology, and can improve active power tracking speed and system dynamic performance.