668 results about "Inner loop" patented technology

Disclosed in the present invention are a grid-connect control method and apparatus for a grid-connect inverter. The method comprises: on the basis of a control structure of a grid-connect inverter in a dp domain, passing a deviation signal of a power outer loop through power outer loop controllers, so as to generate reference values of a current inner loop, and comparing the reference values of the current inner loop with an actual output current, so as to obtain error signals, wherein the control structure comprises a PQ power control outer loop and a current control inner loop, and the actual output current is obtained by means of performing phase tracking, on the basis of a synchronous reference frame phase-locked loop, on the voltage of a point of common coupling; and adjusting the error signals by means of a current inner loop controller, so as to generate modulation signals, performing pulse width modulation (PWM) on the modulation signals, so as to generate an on-off signal of an inverter bridge power semiconductor device, and controlling the state of connection and disconnection between the grid-connect inverter and a power grid on the basis of the on-off signal. In the present embodiment, the connection and disconnection between a grid-connect inverter and a power grid are controlled, so as to improve the stability of the grid-connect inverter in weak power grids.

The invention discloses a fault ride-through hierarchical control method for a network-constructed converter, and the method comprises the steps: introducing a virtual resistor formed by fault current negative feedback into the voltage and current inner loop control of the network-constructed converter based on VSG control through a current inner loop dynamic amplitude limiting control layer after the converter enters a fault ride-through state, the size of the virtual resistor is adjusted in real time along with the amplitude of the fault current so as to carry out dynamic current limiting control on the virtual resistor; and the power outer loop dynamic compensation control layer dynamically adjusts an active power instruction value and a reactive power instruction value of the network construction type converter based on VSG control during the fault ride-through period according to the voltage drop degree of the power grid after the converter enters the fault ride-through state. And respectively performing active-frequency control and reactive-voltage control based on the active power instruction value and the reactive power instruction value. In addition, the method also comprises a state coupling and parameter self-adaption module. According to the method, the GFM converter can have better dynamic performance in the fault recovery stage.

The invention discloses an equipment temperature adjusting method fusing a long short-term memory network, and particularly relates to the technical field of temperature control, which comprises the following steps: determining the deployment position of a sensor through thermal simulation, collecting multi-source heterogeneous data, dynamically adjusting the sampling frequency in combination with the temperature and the load current change rate, and adjusting the temperature of the sensor; after data preprocessing, an attention mechanism enhanced LSTM prediction model is constructed, a time sequence sample data set is divided according to equipment thermal response characteristics, training is carried out, and an optimal model is obtained through early stop mechanism optimization; predictive feedback double-closed-loop regulation and control is achieved based on the optimal model, outer loop PI control is combined with an integral separation mechanism to generate a basic control quantity, an inner loop outputs a correction quantity through fuzzification, reasoning and defuzzification, an actuator is driven after superposition, and safety linkage is triggered synchronously; constructing an incremental data buffer pool to screen effective samples, and adaptively updating model parameters by adopting a layered fine tuning strategy; the temperature regulation and control precision and the long-term self-adaptive capability are obviously improved, and the over-temperature risk of equipment is reduced.

The invention discloses an SLCC control method and system based on similar network type SVF assistance, and the method comprises the steps: generating a first SVF voltage instruction value through an active outer ring and a reactive outer ring, processing the first SVF voltage instruction value through a voltage ring, and obtaining a fundamental frequency reactive compensation current instruction value; processing the LCC output current by using a multi-synchronous rotation coordinate method to obtain a harmonic compensation current reference value; and superposing the fundamental frequency reactive compensation current instruction value and the harmonic compensation current reference value, obtaining a second SVF voltage instruction value in combination with a current inner loop controller, and processing the second SVF voltage instruction value by using a voltage-sharing control strategy and a carrier phase-shifting modulation strategy to obtain a switching signal for controlling the SVF. According to the method, the dependence of the SVF on an alternating current system is reduced, stable and independent operation of the SVF in the SLCC by virtue of the self regulation capability is favorably realized, and the operation reliability and stability of the SLCC are improved.

The invention discloses a high-precision linear vibration feedback motor system, and relates to the technical field of precise electromagnetic driving, and the system comprises a core driving module which is a moving magnet type linear motor of a Halbach array magnetic circuit structure, and is integrated with a multi-physics field sensing unit; the dynamic parameter tracking module is used for acquiring a reed rigidity coefficient, a damping coefficient and a magnetic constant in real time when the motor runs, and establishing a dynamic displacement model based on a recursive least square method; a double-closed-loop control framework is adopted, an inner loop adopts field-oriented control, and an outer loop is based on model prediction control; the aging prediction unit activates a temperature rise compensation algorithm when the accumulated number of vibration times is greater than a set threshold value; the self-adaptive calibration engine is used for injecting a sweep frequency excitation signal when the system is started, and automatically compensating individual difference parameters according to the harmonic peak offset; and the digital twin mapping unit is used for establishing a real-time mapping relationship between the physical parameters of the motor and the virtual model, and dynamically correcting the model parameters by comparing the actual displacement with the model displacement.

A low voltage ride through control method for a grid-forming inverter based on dynamic internal potential adjustment comprises the following steps: detecting a voltage per unit value of a grid-connected point in real time, and comparing the voltage per unit value with a threshold value to judge a voltage drop event and trigger low voltage ride through control; dynamically calculating active and reactive power reference values through a reactive compensation equation and an active current limiting equation according to the voltage amplitude and the power reference value before falling during the ride-through period; inputting the active reference value into a virtual rotor motion equation to generate a reference phase, and outputting a phase reference signal in combination with a dual-mode phase compensation controller; superposing the reactive reference value with the reference voltage through a reactive voltage regulating ring to generate a voltage amplitude reference signal; synthesizing an internal potential according to the phase and the amplitude reference signal, and obtaining an inductive current reference value through virtual impedance control and current amplitude limiting; and finally, a driving signal is generated through the current inner loop controller and the modulation module. According to the invention, overcurrent can be effectively inhibited, rapid reactive power support is provided, and synchronous stability and smooth transition in a fault period and a recovery process are ensured.

The invention discloses a dual-ring active-disturbance-rejection trajectory tracking control method for a four-rotor unmanned aerial vehicle, and the method comprises the steps: representing a dynamic coupling effect of the unmanned aerial vehicle caused by the load mass change and dynamic center-of-gravity shift through a six-degree-of-freedom flight dynamic model containing an asymmetric inertia matrix; an outer ring position control loop and an inner ring attitude control loop are constructed on the basis of an active disturbance rejection controller, and the following control cycles are executed in real time on the basis of integrating an extended state observer: the outer ring position control loop generates a position control signal and an attitude expected angle according to an expected track; the inner loop attitude control loop generates a control quantity for driving the unmanned aerial vehicle according to the attitude expected angle, and the two loops cooperatively work through decoupling logic to realize expected trajectory tracking; estimating and compensating unmodeled dynamics and external interference of the unmanned aerial vehicle in real time through the extended state observer; and dynamically adjusting parameters of the active-disturbance-rejection controller by adopting a particle swarm optimization algorithm.

The invention discloses a high-precision power supply output correction method based on a digital pre-distortion technology, and relates to the technical field of power electronics, and the method comprises the steps: integrating an electricity-heat-magnetism real-time combined observer, and inputting parameters including a power supply output voltage, a current, a power device junction temperature, a magnetic element surface temperature, an environment temperature, and an input voltage ripple; using a hierarchical memory depth pre-distortion compensator to generate an anti-phase pre-distortion signal containing long time domain thermal constant compensation and short time domain capacitance energy storage compensation based on modeling engine output; based on a double-ring adaptive updating module, an inner ring updates electrical parameters, including on resistance and dead time, by taking a switching period as a reference, and an outer ring updates thermomagnetic parameters, including thermal resistance and a magnetic core saturation point, in a minute-level period; and the DAC is connected in series with a pre-distortion signal output end through an anti-interference execution channel, and comprises a noise shaping DAC and a driving stage for delay matching. According to the invention, through an electric-thermal-magnetic three-field combined observation architecture, the limitation of traditional single physical field monitoring is broken through.

The embodiment of the invention provides an oxidation kettle temperature self-adaptive control system and a control method. The control system comprises a temperature detection module; the self-adaptive control algorithm module is used for dynamically adjusting the output of the heating or cooling device through data provided by the temperature detection module based on a self-adaptive control algorithm of a snow ablation algorithm; the feedback control module compares the output of the temperature detection module with a set temperature, the feedback control module adjusts control parameters and ensures that the temperature reaches a set value, the feedback control module adopts a double-closed-loop PID control system, and the double-closed-loop control structure comprises a self-adaptive PID controller of an outer loop and a rapid PID controller of an inner loop which are combined; and the man-machine interaction module allows an operator to set a target temperature and a control parameter, and displays a temperature change curve in real time. Through dynamic adjustment of PID controller parameters combined with real-time monitoring, intelligent analysis and an intelligent optimization algorithm and design of a double-closed-loop feedback system, quick response and stable control of temperature control are realized.

The invention provides a collaborative suppression method for short-circuit current-subsynchronous oscillation of an offshore wind power flexible direct current system, and the method comprises the steps: 1, determining a common parameter for a broadband coupling problem: determining the common parameter through a system topological structure and theoretical analysis of offshore wind power which is directly connected to a receiving-end power grid through flexible direct current for the short-circuit current and subsynchronous oscillation problem; 3, an upper optimization layer based on the DDQN outputs an optimal adjustment instruction for the generality parameters according to the system state, a lower execution layer receives the adjustment instruction of the upper layer, a new generality parameter value is obtained and output to a current inner loop controller, and a current inner loop controller is constructed; the current inner loop controller generates a modulation signal to control the output of the converter. According to the invention, the dynamic damping controller is designed to optimize common parameters, so that collaborative suppression of short-circuit current and subsynchronous oscillation is realized.

The invention discloses an airborne low-detectability photoelectric long-distance stable tracking and aiming method based on a time-sensitive opposite target, and belongs to the technical field of airborne photoelectric detection and target tracking. The method comprises the following steps: step 1, target detection and miss distance calculation: in a level flight section of an airplane, imaging a target in a field of view, carrying out target detection by adopting an optical flow method, and detecting a moving target by analyzing a motion vector of pixel points in an image sequence; and resolving the deviation amount of the target image relative to the visual axis in real time, namely the target pixel miss distance. 2, designing a stable tracking loop: designing a two-layer control structure for the stable tracking loop, stably inhibiting high-frequency disturbance by a gyroscope of an inner loop, performing tracking correction on low-frequency deviation by an outer loop based on pixel miss distance, and finally realizing high-precision tracking. On the basis of real-time pixel miss distance feedback, a two-layer control structure is designed, the miss distance fed back by an outer ring tracking loop is converted into an inner ring control instruction, and the tracking precision and stability are improved.

The invention relates to the technical field of advertisement marketing analysis, in particular to a data diversity identification advertisement marketing system, which comprises a data diversity identification module, a double-loop control module and a cross-layer information sharing channel module, and is characterized in that the data diversity identification module is used for calculating dynamic diversity indexes of multi-source heterogeneous data in real time; the double-circulation control module comprises an outer circulation strategy optimization layer unit and an inner circulation real-time control layer unit, the outer circulation strategy optimization layer unit operates at an hour-level time scale, a reinforcement learning algorithm is adopted to carry out long-term advertisement marketing strategy optimization, and an optimization objective function of the outer circulation strategy optimization layer unit is fused with a dynamic diversity index; the internal circulation real-time control layer unit operates at a second-level time scale, and adopts a parameter self-adaptive control algorithm to adjust an advertisement putting strategy in real time; and the cross-layer information sharing channel module is used for realizing strategy parameter transmission between the outer circulation and the inner circulation and applying strategy consistency constraint conditions so as to collaboratively optimize an advertisement marketing strategy.

The invention relates to the technical field of motor control, and particularly provides a permanent magnet synchronous motor predictive current control method, which comprises the following steps of: establishing a basic mechanism equation of an inner ring and an outer ring in permanent magnet synchronous motor MPCC control, and introducing a lumped disturbance term and a current ripple term into a cost function of the inner ring, the robustness of the MPCC to mismatch of inductance, permanent magnet flux linkage and resistance parameters is improved; and a strong tracking dimension expansion Kalman filtering torque observer is designed on an outer ring, so that the influence of load torque disturbance and sensor measurement noise on the control performance of the motor is reduced. According to the method, the robustness of the MPCC on disturbance such as model internal parameter mismatch and model external uncertain load torque can be enhanced at the same time.

The invention discloses a VSG control method for oscillation instability, and relates to the technical field of wind power control, and the method comprises the steps: determining the sequence impedance of a VSG grid-connected system according to a VSG inverter structure and a control circuit model; generating and analyzing a Bode diagram according to the sequence impedance of the VSG grid-connected system and the equivalent impedance of the power grids with different intensities to obtain a phase margin set; when at least one phase margin which is corresponding to the power grid intensity meeting the first preset condition and is a negative value exists, voltage and current tracking errors are calculated; calculating a current inner loop control rate according to a sliding mode surface function corresponding to the integral sliding mode surface, the voltage and current tracking errors and an exponential reaching law; when it is judged that the sliding mode surface function meets a second preset condition, an actual current measurement value is obtained; when the actual current measurement value does not conform to a third preset condition, the VSG grid-connected system sequence impedance is deduced again until no negative phase margin exists in the phase margin set; the steady-state error can be effectively eliminated, and the control performance is improved.

The invention discloses a converter grid following-grid construction control mode smooth switching method suitable for wide-range source-grid state change. The method comprises the following steps: constructing a phase-locked loop control loop, a power outer loop control loop and a current inner loop control loop of a grid following type converter based on constant power control; constructing a voltage control loop, a phase control loop and a voltage and current double-closed-loop control loop of the network construction type converter based on the virtual synchronous generator VSG; calculating real-time output active power P and reactive power Q of the converter; constructing a voltage phase synchronization loop switching control loop and a current instruction tracking loop, and realizing smooth switching of dq-axis current instruction values output by a power outer loop of a following network type and a voltage outer loop of a construction network type; and the output dq-axis current instruction value is transmitted to a current inner loop to generate a final voltage signal, and a PWM wave is output to the converter through a modulation link. According to the method, a voltage phase synchronous switching compensation mechanism is adopted, a voltage amplitude and a phase signal are synchronously corrected in the mode switching process, and smooth change of an inner ring current reference signal is achieved.

The embodiment of the invention discloses a converter fault ride-through method and system based on a dynamic virtual impedance parameter, and relates to the technical field of power electronics, and the method comprises the steps: latching the virtual internal potential amplitude of a converter and the angular velocity of a system before a fault when the voltage amplitude of a grid-connected point is detected to be lower than a preset voltage threshold value; calculating d-axis and q-axis fault current components which are expected to flow through the converter by using latch data, a current grid-connected point voltage amplitude, a virtual impedance initial value before a fault and controller output delay, calculating to obtain a three-phase fault current maximum peak value, comparing the three-phase fault current maximum peak value with a maximum current which can be borne by the converter, and determining the current value of the converter. And according to a comparison result, an adjustment coefficient and an impedance proportionality coefficient, a virtual resistor and a virtual inductor are dynamically calculated and updated, new d-axis and q-axis current reference values are calculated together with a latched virtual internal potential amplitude and d-axis and q-axis voltages of the current grid-connected point, and the new d-axis and q-axis current reference values are input into a current inner loop controller to control the output of the converter.

The invention discloses an off-grid and grid-connected smooth switching control method for a virtual synchronous generator based on adaptive parameters, and the method achieves the efficient switching and smooth transition of an off-grid and grid-connected mode through the dynamic adjustment of virtual impedance, rotational inertia and a damping factor based on a virtual synchronous generator control architecture of the adaptive parameters. The control architecture is divided into an inner loop current and voltage control module, an outer loop power-frequency control module and a self-adaptive parameter adjustment module, and comprises virtual impedance design, dynamic rotational inertia adjustment, self-adaptive damping factor switching and parameter optimization and modal analysis. In this way, the concept of virtual impedance is introduced into VSG control to improve the decoupling effect of active power and reactive power; a parameter alternating VSG is provided, singular value decomposition analysis and modal analysis are considered, and better performance is provided in the aspect of suppressing oscillation caused by disturbance by improving control parameters; and stable resynchronization between the converter and the power grid after grid connection and grid disconnection is realized.

The invention discloses a three-phase hybrid rectifier model predictive current control method based on a variable exponential sliding mode. An inner ring active rectifier adopts a rapid optimal three-vector model predictive controller; the inner ring passive rectifier adopts a three-order extended state observer-model prediction controller; and a voltage outer loop adopts variable exponential reaching law sliding mode control. According to the method, the variable exponential reaching law sliding mode control can effectively restrain violent buffeting caused by large gain. The fast optimal three-vector model predictive controller can determine the optimal vector combination through only two times of optimization, so that the calculation complexity is greatly reduced. According to the input voltage observation method based on the third-order extended state observer, the number of used sensors is reduced, and meanwhile the input current quality is improved. The research of the method has important significance for improving the reliability of the industrial equipment power supply.

The invention discloses a control method of an interleaved parallel bidirectional DCDC converter. A circuit of the converter comprises three pairs of MOSFET switch tubes, three inductors and an output capacitor. The phase difference of PWM waves of the three pairs of MOSFET switch tubes is 120 degrees, and the phase difference is used for effectively reducing current ripples through staggered complementation of currents of all phases. Double closed-loop control is adopted, the DSP chip is responsible for current inner loop control, and the FPGA chip is responsible for voltage outer loop and power outer loop control. The current sharing precision is high, through flexible configuration of multiple proportionality coefficients and zero points, input fluctuation and load abrupt change interference can be accurately restrained, oscillation is avoided, stable output is ensured, and when load abrupt change or mode switching is carried out, output can be rapidly adjusted, transition time can be shortened, and overshoot can be reduced. And high dynamic response and strong robustness of the system are realized, so that complex and changeable application requirements are met.

The invention relates to an autonomous agent-oriented large language model element cognitive correction self-updating reward method, which comprises the following steps of: firstly, automatically generating an initial reward function by utilizing a large language model (LLM) according to high-level task description by using the AURA; then, meta-cognition on calculation is realized through a double-loop architecture: a rapid internal loop carries out collaborative evolution of strategies and rewards through a layered attention reward synthesizer; a slower outer cycle serves as a meta-cognitive layer, and a multi-dimensional diagnosis vector composed of strategy dynamics, value-authenticity alignment and reward architecture adaptability is continuously monitored so as to recognize anomalies in the learning process. The closed-loop feedback mechanism endows the autonomous agent with the capability of carrying out introspection and self-correction on the award function of the autonomous agent, and normal form transformation from static target specification to dynamic target correction is formed. And the robustness, the sample efficiency and the final performance of the intelligent agent in the face of sparse rewards, protocol vulnerabilities and environment uncertainty are enhanced.

The invention provides a control method and system for a quad-rotor unmanned aerial vehicle for random pulse spoofing attacks, and relates to the technical field of unmanned aerial vehicle control. Establishing inner and outer ring error equations under the random pulse spoofing attack based on the inner and outer ring system dynamics models and random pulse injection error data; a continuous outer ring controller and a continuous inner ring controller are constructed, controller gains are designed according to the intensity and frequency of random pulse spoofing attacks, the outer ring controller performs continuous control on a leading-following task of the quad-rotor unmanned aerial vehicle, and an expected control quantity is issued to the inner ring controller; and the inner ring controller performs actual control on the quadrotor unmanned aerial vehicle according to the expected control quantity, and when the error between the expected control quantity and the actual control quantity of the inner ring controller tends to 0, the leader-following task of the quadrotor unmanned aerial vehicle is controlled to be realized. According to the invention, the quad-rotor unmanned aerial vehicle can resist the random pulse spoofing attack when carrying out the leader-following task.

The invention relates to the technical field of rectification circuit control, in particular to a three-phase rectification circuit control method based on sliding-mode predictive control and a charging pile, and the method comprises the steps: obtaining a sliding-mode control law through employing a super-spiral sliding-mode control algorithm in outer-loop voltage regulation, and taking the sliding-mode control law as an active power reference value; in inner loop current control, voltage components and current components of three-phase alternating voltage in a two-phase rotating coordinate system are obtained through coordinate system transformation, and active power and reactive power at the future moment are obtained through a discretization prediction model; and performing rolling optimization by the cost function to obtain the optimal switching state at the current moment, updating the controller according to the optimal switching state, and performing prediction control on each switching device of the three-phase rectification circuit through the updated controller. According to the three-phase rectification circuit control method based on sliding mode predictive control, stable reference voltage can be provided, output is stable, the disturbance suppression capacity is high, and quick response and multivariable optimization control are achieved.

The invention discloses a joint strengthening contour control method of a robot milling machining system. The joint strengthening contour control method comprises the steps that the robot edge milling machining system is built; a contour error solving strategy based on a switching geometric method and projection factors is established to obtain a contour error compensation target point and a contour error in the motion process of the mechanical arm; an inner ring and outer ring double-layer cascade contour error control strategy is established, a flexible joint mechanical arm system is decomposed into a fast subsystem and a slow subsystem, mechanical arm dynamic system parameters are predicted, an inner ring guarantees the tracking precision of the flexible joint mechanical arm in a joint space based on the fast subsystem and slow subsystem control laws, and an outer ring corrects contour errors. The contour motion precision of the Cartesian space of the mechanical arm is ensured; and adopting a contour error solving strategy and an inner ring and outer ring double-layer cascade contour error control strategy to carry out double-ring cascade contour control on the robot edge milling processing system. The dynamic tracking precision is improved, and the contour precision of the mechanical arm in the moving process is effectively improved.

The invention relates to a DSTATCOM harmonic current detection and tracking control method, which comprises the steps of collecting instantaneous current and instantaneous voltage of a load side of a power distribution network, processing a power distribution network instruction current signal detected in real time through an improved dq0 compensation amount detection algorithm, obtaining a to-be-compensated negative-sequence frequency doubling component and a to-be-compensated specific subharmonic component, and carrying out harmonic current tracking on the to-be-compensated negative-sequence frequency doubling component and the to-be-compensated specific subharmonic component. The obtained negative sequence frequency doubling component and the specific sub-harmonic component to be compensated are sent into a current inner loop, three-phase reference voltage is obtained through a PIR controller, generation of PWM pulses is controlled, then on-off of a DSTATCOM bridge arm switching tube is controlled, and a closed-loop control system is formed. A path for extracting an orthogonal component in instruction current is reconstructed, the positive sequence fundamental current detection error under the three-phase imbalance working condition is remarkably reduced, a compensation current control strategy based on a PIR controller is adopted in a current inner loop, and zero-static-error tracking of a frequency doubling component and a low-frequency harmonic component in compensation current is achieved.

The invention discloses a fault networking operation control method and system under SVI power grid voltage phase jump. The control method comprises the steps of frozen active integral output, equivalent internal potential phase compensation and transient over-current suppression. And if the difference value between the power grid voltage angular frequency and the self-generated angular frequency is greater than a threshold triggering mark position 1, restoring to 0 after keeping for a set time. When the mark position is 1, 1) the active integral output is frozen, so that the self-generated angular frequency keeps the angular frequency unchanged at the moment before the fault; and 2) equivalent internal potential phase angle compensation: calculating a difference value between a power grid phase angle and a self-generated phase angle in real time, generating a compensation phase angle, and further generating an equivalent internal potential phase angle. During the fault ride-through period, transient overcurrent is suppressed, according to the overcurrent multiple, the original virtual impedance set multiple is increased, and / or additional virtual impedance is input and multiplied by inductive current to obtain compensation voltage, and virtual impedance and current inner loop control is carried out after the compensation voltage and the grid-connected voltage are subtracted from the remolded internal potential instantaneous value at the same time.

The invention discloses a current prediction control method based on a permanent magnet synchronous motor. A control system of the permanent magnet synchronous motor comprises a storage unit in which various parameter tables are preset; the control method comprises the following steps: performing temperature prediction according to current sampling data; dividing a temperature operation interval, judging the temperature operation interval according to the predicted temperature prediction value, and carrying out current amplitude limiting; unifying various temperature limiting amplitudes and voltage limiting amplitudes, establishing constraint conditions of the permanent magnet synchronous motor, and converting equality constraints into a target function through the constraint conditions; eliminating a voltage inequality constraint and a dynamic current inequality constraint in the target function; and finally, calculating to obtain a current reference value at the next moment, and processing the current reference value by the inner loop controller to output a switching signal to the inverter. The control system can adjust constraint conditions and objective functions on line according to actual working conditions such as temperature and motor parameter changes, and robust control over environment disturbance and non-linear influences is achieved.

The invention relates to the technical field of data processing, and discloses a virtual synchronous machine control method and device of a photovoltaic power station. The method comprises the steps that virtual synchronous calculation is conducted on a virtual inertia parameter and a virtual damping coefficient through a double-closed-loop controller, a PWM control signal of an inverter is obtained, an outer loop is power angle control, and an inner loop is current proportional resonance control; performing coordination control on the power grid frequency change data and the virtual inertia parameters through a dynamic adjustment algorithm to obtain a system power reserve control strategy and a seamless switching strategy; and performing performance evaluation and parameter optimization on the system operation data through a fuzzy adaptive algorithm to obtain optimized virtual synchronous machine parameters and MPPT control parameters. According to the invention, the efficiency and accuracy of virtual synchronous machine control of the photovoltaic power station are improved.

The invention belongs to the technical field of grid-connected inverter harmonic analysis, and particularly discloses a grid-connected inverter harmonic closed-loop transmission analysis method and system considering broadband coupling. The method comprises the following steps: respectively establishing a harmonic component transfer function of each module; based on the harmonic component transfer function of the sampling module, calculating to obtain harmonic active power and harmonic reactive power input to the power outer loop control module; based on a harmonic component transfer function of the power outer loop control module, calculating to obtain a harmonic current component in a reference current signal output by a power outer loop; based on a harmonic component transfer function of a current inner loop control module, obtaining a three-phase modulation voltage harmonic component and an inverter port voltage harmonic component through coordinate inverse transformation; on the basis of the inverter port voltage harmonic component, a main circuit harmonic transfer equation is combined, and a grid-connected point harmonic current component is obtained through calculation; the method overcomes the defects that a traditional analysis method cannot consider the control of a whole loop by a closed loop, and the broadband coupling is insufficiently considered.

The invention relates to a ripple suppression PI loop control method, a storage medium and a device, and the method comprises the steps: extracting a frequency doubling component in an inversion power flow based on the filtering and Park transformation of a secondary second-order generalized integrator, determining the reverse compensation amount at each moment based on the frequency doubling component and a battery connected with a DC circuit, and carrying out the control of the ripple suppression PI loop. And finally, based on the sum of the reverse compensation amount at each moment and an original reference current value output by a voltage outer ring on each bridge arm of the DC circuit, determining a current reference instantaneous value after reverse compensation of a current inner ring input to each bridge arm at each moment. According to the method, a pure frequency doubling component with very high dynamic performance and related to ripple information is obtained, then according to the extracted frequency doubling component and battery parameters, the reverse compensation amount used for suppressing ripple in loop control is obtained, and then the reverse compensation amount is accumulated to a voltage outer loop, so that the ripple information is suppressed. Therefore, ripple suppression with good dynamic performance and good suppression effect in loop control is realized.

The invention discloses a tilt rotorcraft decoupling flight control method based on model compensation. The tilt rotorcraft decoupling flight control method comprises the steps that a flight control system reads airborne sensor data in real time; according to control input acquired in real time and airborne sensor data, superposing force and torque generated by each component by utilizing a nonlinear dynamic model of the tilt rotorcraft to obtain the stress condition of the rotorcraft body; determining a first-order differential of the model state quantity of the tilt rotorcraft; linearizing the nonlinear dynamic model, extracting a control matrix and constructing attitude inner ring virtual control input; on the basis of inversion of the transfer function, constructing an inverse model expression of each channel of the tilt rotorcraft; constructing an error compensation link of each channel to compensate a model error; and minimizing an increment norm of the compensated virtual control quantity through a weighted pseudo-inverse control distribution model to obtain an increment of the control quantity, and forming a final execution command in combination with the current total pitch and the helm deflection angle to be sent to a rotor and control surface execution mechanism of the tilt rotorcraft.