178results about How to "Improve dynamic characteristics" patented technology

The invention discloses a follow-up type superhard grinding wheel outer circle reciprocating grinding force measuring device and method, relates to the technical field of grinding machining, and solves the problem that grinding force follow-up measurement in a reciprocating grinding mode cannot be achieved in grinding force measurement in the prior art. The device comprises a driving tool, wherein the driving tool is used for clamping one end of a workpiece and driving the workpiece to rotate; a Z-axis moving assembly is fixedly arranged on the driving tool, a moving supporting table is arranged at the moving end of the Z-axis moving assembly, and the Z-axis moving assembly can drive the moving supporting table to move in the axial direction of the workpiece. A tangential telescopic measuring mechanism and a normal telescopic measuring mechanism which are perpendicular to each other are arranged on the movable supporting table, and the tangential telescopic measuring mechanism and the normal telescopic measuring mechanism can be in contact with the outer wall of the workpiece on the same normal plane perpendicular to the axis of the workpiece to measure force; the driving tool is adjustably provided with a Z-axis force measurement supporting tip, and the Z-axis force measurement supporting tip can be matched with the other end of the workpiece. Grinding force measurement in the reciprocating grinding machining process is achieved, and the grinding process can be monitored timely and accurately.

The invention discloses an active damping control system for improving the output impedance of a current source type inverter, which comprises a current loop control loop, an active damping branch and an improved phase-locked loop, and is characterized in that the difference value of reference current and feedback network access current passes through a current controller to form the current loop control loop; the voltage of the grid-side inductor is fed back to the output of the current loop through the virtual resistor link to form a damping branch, and the voltage of the common coupling point enters the traditional phase-locked loop link through the low-pass filter and forms an improved phase-locked loop through phase compensation. The optimal feedback coefficient of the damping branch is designed according to the optimal damping ratio, the low-pass filter parameters are designed according to the phase at the maximum resonant frequency, the reasonable proportional gain link is designed according to the improvement of the output impedance amplitude, the resonance of the current source type inverter can be effectively inhibited, the output impedance of the inverter is increased, and the output impedance of the inverter is improved. And the quality of the network access current of the current source type inverter and the stability margin of the current source type inverter in a weak power grid are improved, and the stability of the system is improved.

The invention discloses a double-face machining grinding machine which comprises a box body part, a lower grinding head assembly, a feeding part, an upper grinding head assembly, an upper main shaft driving device, a Z-axis feeding part, a finishing mechanism and a lower main shaft driving device. The upper grinding head assembly and the lower grinding head assembly are symmetrically arranged up and down and are supported and mounted on the box body part by adopting a hard rail and sliding rail pair; the feeding part is mounted in front of the box body part; the upper main shaft driving device and the lower main shaft driving device are symmetrically arranged on the back of the box body part up and down and respectively provide grinding power for the upper grinding head assembly and the lower grinding head assembly; the two groups of Z-axis feeding parts are respectively arranged behind the upper grinding head assembly and the lower grinding head assembly, are fixed in the box body component and are used for providing Z-axis feeding force for the upper grinding head assembly and the lower grinding head assembly; the finishing mechanism is installed on the back face of the box body part and located between the upper grinding head assembly and the lower grinding head assembly. The box body part comprises an upper box body, a lower box body and a base. The invention has the advantages of good dynamic rigidity of the whole machine and stable performance.

The invention discloses an angular frequency correction-based active power control method and device for a virtual synchronous generator of a network-forming converter, and the method comprises the steps: correcting the angular frequency outputted by the virtual synchronous generator through an active power error; the contradictory problem that the active power control dynamic state has oscillation and the steady state has power deviation under the control of the virtual synchronous generator of the conventional grid-forming converter is solved. According to the method, a proportional controller is introduced on the basis of a control strategy of a virtual synchronous generator of a conventional grid-forming converter, and an active power error is adjusted by the proportional controller and then is used for correcting an angular frequency output by the virtual synchronous generator, so that the target of adjusting the active power is achieved; therefore, the improved active power control of the virtual synchronous generator of the grid-forming converter not only has inertia and damping characteristics, but also has no power steady-state error.

The invention discloses a control system for a phase-locked loop-free synchronous tracking mode of a hybrid network following-construction system, and belongs to the technical field of virtual synchronous generator control, phase angle information generated by network construction type control is used for synchronization of a network following type inverter, and synchronization of the network following type inverter is realized without a phase-locked loop. According to the control technology, potential unstable factors caused by the dynamic state of the phase-locked loop can be avoided, and meanwhile, the two inverters of the following network and the constructing network have better transient performance. According to the improved scheme, an ideal voltage source on the direct current side of the inverter is replaced by a boost circuit controlled by a single current loop, and a direct current voltage loop is added to an active loop controlled by a network constructed on the alternating current side. Compared with the control technology provided by the invention, the improvement enables the control technology to have no frequency steady-state deviation and have better transient and steady-state performance.

The invention provides a dynamic double-closed-loop control method for a magnetic suspension energy storage flywheel rotor based on LADRC. The dynamic double-closed-loop control method is used for realizing stable suspension and dynamic control of the magnetic suspension energy storage flywheel rotor. Firstly, a mathematical model of each degree of freedom of a flywheel rotor and a linearization model of a power amplifier-electromagnet coil under a magnetic bearing coordinate system are established; then, defining an electromagnetic coupling term, a gyroscope coupling term and an unbalance term in the flywheel rotor mathematical model as external disturbance, deducing a flywheel rotor and power amplifier-electromagnet coil mathematical model for controller design, and designing a position loop second-order LADRC controller and a current loop first-order LADRC controller; and finally, setting controller parameters of a position loop and a current loop by adopting a pole assignment method. Simulation results show that the double-closed-loop control strategy can realize effective decoupling among degrees of freedom under static and high-speed suspension working conditions of the flywheel rotor, and compared with PID control, the double-closed-loop control strategy is good in dynamic characteristic and strong in anti-interference capability. The method is of great significance in guaranteeing stable and reliable operation of the magnetic suspension energy storage flywheel rotor.

The invention discloses a virtual synchronous machine active low-frequency oscillation suppression method based on power feedback compensation, and belongs to the field of new energy grid-connected converter control under large-scale new energy access. According to the method, the output voltage and current of the new energy converter are sampled, the instantaneous output active power and reactive power are calculated, and the average output active power and reactive power are obtained through a first-order low-pass filter; and then virtual synchronous machine active outer loop control based on output power feedback compensation and reactive outer loop control based on reactive-voltage droop are adopted to obtain reference values of a d-axis voltage amplitude and a voltage phase angle of new energy converter voltage inner loop control, and output voltage closed loop control is carried out. Under the condition that the output active control order and the steady-state characteristic are not increased, the output active dynamic overshoot and low-frequency oscillation suppression of the new energy converter based on the network construction control type virtual synchronous machine are effectively realized, the parameter value range is slightly constrained by the system stability, and the engineering application is simple.

The invention discloses a hybrid energy storage-based virtual synchronous generator inertia adaptive control method, which comprises the following steps of: acquiring three-phase voltage and three-phase current signals output by an alternating current side of a virtual synchronous generator, and calculating the output power of the virtual synchronous generator, constructing a virtual rotor mechanical model and a virtual excitation regulator model of the virtual synchronous generator; a Phillips-Heffron model of the virtual synchronous generator is constructed, and a design principle of virtual inertia is obtained; the output frequency of the virtual synchronous generator is used as a control target to carry out traditional self-adaptive adjustment on the virtual inertia, the charge state of the super capacitor is used as a control target on this basis to secondarily adjust the virtual inertia, the virtual inertia is converted into modulation voltage through a virtual impedance environment and a voltage and current double-closed link, PWM modulation is carried out on the obtained modulation voltage, and the modulation voltage is obtained. The inverter can be controlled to track the given voltage, and the inverter can adjust the frequency and the voltage of the power grid.

The invention discloses a data-driven calculation method, device and equipment for hydrogen storage capacity of a solid-state hydrogen storage device, and belongs to the technical field of solid-state hydrogen storage. The method comprises the steps that distributed parameters of the solid-state hydrogen storage device are obtained through a multi-physical-field full-coupling model of the solid-state hydrogen storage device, and the multi-physical-field full-coupling model is constructed based on structural characteristics of the solid-state hydrogen storage device; obtaining a dynamic response database of the multi-physics field full-coupling model, wherein the dynamic response database is used for representing a corresponding relation between distributed parameters of the multi-physics field full-coupling model and the hydrogen storage capacity of the solid hydrogen storage device; performing dynamic identification on the multi-physical field full-coupling model through a dynamic response database to obtain an identification model of the solid hydrogen storage device; and inputting the target distributed parameters of the solid-state hydrogen storage device into the identification model, and performing data driving calculation on the target distributed parameters through the identification model so as to output the predicted hydrogen storage amount of the solid-state hydrogen storage device. According to the method, the calculation cost and the solving time can be reduced.

The invention provides a wide bandgap semiconductor trench gate MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) structure and a manufacturing method thereof. In the structure, an N + current expansion layer is positioned in an upper region of an N-epitaxial layer; the P-well region is located on the N + current expansion layer, and the source N + region is located on the P-well region; the plurality of trench gate electrodes are arranged at intervals along the horizontal direction, and a first source P + region is arranged between every two adjacent trench gate electrodes in the middle region; the trench gate electrode penetrates through the source N + region, the P-well region and the N + current expansion layer in the longitudinal direction and extends into the N-epitaxial layer; a second source P + region is arranged at the bottom of the trench gate electrode; the P-type connection region is connected with the plurality of second source P + regions in the second direction; an interlayer dielectric layer is arranged above the trench gate electrode; the N + contact region is arranged at the first source P + region in an extending mode in the first direction, and the Schottky contact region is located above the N + contact region. The structure can improve the current density of the device, improves the conduction characteristic of the device, can also form a net-shaped P-type region protection gate electrode, and improves the dynamic reliability of the gate electrode of the device.

The invention discloses a barium titanate-based leadless piezoelectric ceramic material and a preparation method and application thereof, and relates to the technical field of functional materials, the chemical formula of the barium titanate-based leadless piezoelectric ceramic material is Ba0. 9Sr0. 1Ti1-xSnxO3, x = 0-0.10, and x represents a mole fraction. By regulating and controlling the concentration of Sn ions in the BT-based lead-free piezoelectric ceramic, a multiphase structure with flat free energy is formed near the room temperature, meanwhile, an unconventional short-range disorderly-arranged polar snow-mud-state domain structure is induced, an extremely good domain change dynamic behavior is shown under the action of an external field, and the piezoelectric ceramic is prepared. Meanwhile, excellent piezoelectric property, electrostrictive property, electrocaloric property and mechanical property are obtained, and a candidate material is provided for a new generation of multifunctional high-precision electronic information devices.

The invention discloses a control method and device for a high-voltage direct-current transformer of a full-direct-current system. The control method comprises the following steps: on the basis of a traditional double-closed-loop control method, the voltage on an inductor is fed back to a current inner loop through a state observer to influence the generation of dq-axis reference voltage, that is, the secondary side modulation wave voltage is obtained through state observation; subtracting the secondary side modulation wave voltage from the primary side modulation wave voltage to obtain a voltage on an inductor, and feeding back the voltage on the inductor to the output of a current inner loop controller as a superposition term for generating a dq-axis reference voltage; the voltage outer ring enhances DC side damping by introducing a DC side virtual resistor, and corrects the reference current of the current inner ring. The voltage on the inductor is fed back to the current inner ring through the state observer to improve the current inner ring, the direct current side damping is enhanced by introducing the direct current side virtual resistor, cooperative control of the current inner ring and the voltage outer ring is achieved, the dynamic characteristic and stability of the current inner ring are improved, and the oscillation problem is solved.

The invention discloses a joint quantification method and system for flexibility of an adjustable energy system in a building. The method comprises the following steps: establishing an adjustable energy system simulation platform; flexible response parameters are input into the simulation platform, parallel simulation is carried out on the baseline working condition, the independent response working condition and the combined response working condition, and simulation data corresponding to each working condition are obtained; comparing energy consumption parameters in the simulation data under other response working conditions by taking the simulation data of the baseline working condition as a reference, and segmenting time periods; respectively calculating flexibility parameters of each system under each response working condition according to the segmented time periods; and the gain rates of the flexibility parameters of the air conditioning system under the two response working conditions serve as joint effect indexes. According to the method, a set of building energy flexibility quantification framework for two systems is adopted, and multi-dimensional quantitative characterization is carried out on the joint effect. And the dynamic power change of the air conditioning system under the internal disturbance flexible action can be reflected.

The utility model provides a volume holographic optical waveguide display device with high uniformity. The volume holographic optical waveguide display device comprises an optical-mechanical system, a waveguide system and a control system, the waveguide system comprises a waveguide substrate and a grating structure arranged in the waveguide substrate, and specifically, the grating structure is a switchable Bragg grating array formed by holographic polymer dispersed liquid crystals. According to the utility model, the on-off state of the sub-grating is controlled by applying an electric field through the control electrode, and the sub-grating is controlled to be in a state with the maximum diffraction efficiency when being opened, so that the grating can couple most light energy in one-time diffraction, and the brightness and the uniformity of single-time light emission are improved; meanwhile, different coupling areas are switched in the grating structure through the control system, and the output view field freely moves in different grating areas, so that the same view field effect of opening all grating view fields is constructed, the basically uniform brightness of the whole coupling area is obtained, and the overall light effect utilization rate and the overall light brightness are improved.

The invention provides a prediction control method and system for a three-port DC-DC converter, and the method comprises the steps: solving a transmission relation between a current and a phase shift angle based on the structure parameters of the three-port DC-DC converter; a feedforward decoupling network is adopted, and a decoupled voltage ring is obtained through the transfer relation between the current and the phase shift angle; performing predictive control by adopting a predictive controller based on the output voltage of the decoupled voltage loop; according to the three-port DC-DC converter, the feed-forward decoupling network is adopted, decoupling control of the three-port DC-DC converter is achieved through decoupling of the transfer relation between the current and the phase shift angle, the decoupled voltage ring is obtained, and when prediction control is conducted on the decoupled voltage ring through the prediction controller, balance control over the load voltage and the power flow can be achieved; and better dynamic characteristics are obtained, so that smaller voltage fluctuation is obtained at the moment of load switching, and the efficiency of the whole machine is improved.

This invention belongs to the field of robot joint technology, specifically relating to a rope-driven, decoupled, dual-parallel five-DOF bionic shoulder joint, including a scapulothoracic joint mechanism, a glenohumeral joint mechanism, a drive base device, and drive ropes. The scapulothoracic joint mechanism and the glenohumeral joint mechanism are internally rotatably connected. The drive base device is used to fix the scapulothoracic joint mechanism and to provide drive ropes for both mechanisms. The scapulothoracic joint mechanism is constrained by a first constraint branch, a second constraint branch, and a decoupling through-line branch, satisfying the pure rolling two-DOF rotation requirement, driven by two sets of antagonistic drive ropes. The glenohumeral joint mechanism is driven by four independent drive ropes to achieve three-DOF rotational motion. The decoupling through-line branches distribute the drive ropes of the glenohumeral joint mechanism, achieving physical decoupling and ensuring that the drives of the two mechanisms do not interfere with each other. Through rope-driven and dual-parallel passive mechanisms, a larger range of motion can be achieved, improving the stiffness and load-bearing capacity of the mechanism.

The application provides a high-dynamic force measuring device and method for a gas actuator, and relates to the technical field of force measurement of the gas actuator. The application discloses a high-dynamic force measuring device and method for a gas actuator, and relates to the technical field of force measurement of the gas actuator. The application discloses a high-dynamic force measuring device and method for a gas actuator, and relates to the technical field of force measurement of the gas actuator. The application discloses a high-dynamic force measuring device and method for a gas actuator, and relates to the technical field of force measurement of the gas actuator. The application discloses a high-dynamic force measuring device and method for a gas actuator, and relates to the technical field of force measurement of the gas actuator. The application discloses a high-dynamic force measuring device and method for a gas actuator, and relates to the technical field of force measurement of the gas actuator. The application discloses a high-dynamic force measuring device and method for a gas actuator, and relates to the technical field of force measurement of the gas actuator. The application discloses a high-dynamic force measuring device and method for a gas actuator, and relates to the technical field of force measurement of the gas actuator. The application discloses a high-dynamic force measuring device and method for a gas actuator, and relates to the technical field of force measurement of the gas actuator. The application discloses a high-dynamic force measuring device and method for a gas actuator, and relates to the technical field of force measurement of the gas actuator. The application discloses a high-dynamic force measuring device and method for a gas actuator, and relates to the technical field of force measurement of the gas actuator. The application discloses a high-dynamic force measuring device and method for a gas actuator, and relates to the technical field of force measurement of the gas actuator. The application discloses a high-dynamic force measuring device and method for a gas actuator, and relates to the technical field of force measurement of the gas actuator. The application discloses a high-dynamic force measuring device and method for a gas actuator, and relates to the technical field of force measurement of the gas actuator. The application discloses a high-dynamic force measuring device and method for a gas actuator, and relates to the technical field of force measurement of the gas actuator. The application discloses a

The present invention discloses a mold locking mechanism for a bottle blowing machine, comprising a mold frame support, a left mold frame and a right mold frame respectively rotatable around a first axis and arranged on the mold frame support, a driving assembly arranged on the mold frame support and used for driving mold opening and closing, a left fastener arranged on the left mold frame, a right fastener rotatable around a second axis and arranged on the right mold frame, a movable mold locking member arranged on the right fastener, and a locking assembly used for locking the mold locking member on the right fastener; when the left mold frame and the right mold frame are in a mold closing position, the left fastener and the right fastener are interlocked with each other; the mold locking member is used to hook against or disengage from the left fastener when moving relative to the right fastener; the driving assembly is used to drive the right fastener to rotate relative to the right mold frame away from the left fastener when opening the mold, and is also used to drive the right fastener to rotate relative to the right mold frame close to the left fastener when closing the mold. The present invention discloses a mold locking mechanism for a bottle blowing machine, which can take out bottles at a relatively small mold opening angle, has a relatively small mold frame rotation angle, and has good dynamic characteristics.

This invention discloses a variable-wave arc welding power supply control method, arc welding equipment, control device, and storage medium. Applied to an arc welding equipment, the equipment includes a coordination control module and at least two power conversion modules. The coordination control module is connected to the controlled terminals of each power conversion module to control the switching of the power conversion modules to form and output pulse power. The output terminals of each power conversion module are connected in parallel to superimpose the electrical energy of the arc welding power supply. The variable-wave arc welding power supply control method includes: the coordination control module outputting its corresponding control commands to each power conversion module; and each power conversion module adjusting the pulse width and on / off timing of the pulse power according to the control commands to increase the power or voltage amplitude of the arc welding power supply. This design optimizes the output waveform of the welding power supply, enabling it to provide excellent dynamic characteristics and improve welding performance.

The invention provides a control method and device for a network-forming type grid-connected converter. According to the output voltage stable value of the grid-connected converter under the two-phase rotating coordinate system and the current reference value of the filter inductor under the two-phase static coordinate system, the voltage and current inner loop control of the grid-connected converter is realized, the control performance of the grid-connected converter can be improved, and the stable operation of the grid-connected converter is ensured. According to the invention, the actual value of the output voltage of the grid-connected converter under the two-phase static coordinate system is calculated according to the actual value of the current of the filter inductor and the actual value of the voltage of the primary winding, so that the state feedback control of the grid-connected converter is realized, and the dynamic characteristics of the grid-connected converter can be improved. And the control dimension of the network construction type grid-connected converter can be effectively increased.

The utility model discloses a semiconductor device. The semiconductor device includes: a substrate; the buffer layer is positioned on one side of the substrate; the channel layer is located on the side, away from the substrate, of the buffer layer; the composite barrier layer comprises a first barrier layer and a second barrier layer, the first barrier layer is located on the side, away from the buffer layer, of the channel layer, and the second barrier layer is located on the side, away from the channel layer, of the first barrier layer; the band gap of the second barrier layer is larger than that of the first barrier layer; the dielectric layer is located on the side, away from the channel layer, of the composite barrier layer; the grid is located on one side, away from the composite barrier layer, of the dielectric layer; the source electrode is located on the side, away from the channel layer, of the composite barrier layer; and the drain electrode is positioned on one side, far away from the channel layer, of the composite barrier layer. According to the technical scheme, the dynamic characteristics of the depletion type gallium nitride semiconductor device are improved.

The invention relates to a super-junction vertical double-diffused metal oxide semiconductor device and a preparation method thereof. The super-junction vertical double-diffused metal oxide semiconductor device comprises a substrate structure; the super junction structure is arranged in the substrate structure; the super junction structure comprises first doped regions and second doped regions which are sequentially and alternately arranged along a first direction; the first direction is perpendicular to the thickness direction of the substrate structure; the body region is arranged in the substrate structure and located on the side, close to the front face of the substrate structure, of the first doping region; the source region is arranged in the body region; the grid electrode is arranged on the substrate structure; wherein the first doped region comprises a first sub-doped region connected with the body region, and the doping concentration of at least part of the first sub-doped region is gradually increased from the edges of the two sides of the first sub-doped region in the first direction to the center of the first sub-doped region; the substrate structure, the second doped region and the source region are of a first conductive type, and the first doped region and the body region are of a second conductive type. The dynamic characteristics of the device can be improved.

The invention provides a wafer claw using a flexible hinge, and relates to the technical field of silicon wafer conveying devices. The sheet claw comprises a driving assembly and an adsorption assembly, the driving assembly comprises a base and a driving piece, the driving piece is used for driving the adsorption assembly to ascend and descend, the driving piece comprises a fixed part and a movable part, the fixed part is fixedly connected with the base, and the movable part is fixedly connected with the adsorption assembly; the sheet claw further comprises a plurality of fixing bases which are evenly arranged around the axis of the movable part, and a flexible hinge is connected between each fixing base and the movable part. The flexible hinge comprises at least one branch chain, each branch chain comprises at least one flexible piece, and the flexible pieces extend in the direction perpendicular to the lifting direction of the adsorption assembly. The wafer claw can achieve the guiding effect of a linear bearing, does not use a lubricant, can avoid the situation that grease volatilizes in high-vacuum and ultrahigh-vacuum environments to generate particles to pollute the environment and silicon wafers, and does not have the problem of gas leakage.

The present invention provides a pilot hydraulic angle self-servo valve, comprising a connecting plate, a steering gear cover, a left end cover, a cylinder body, a steering gear, a pilot valve, a main valve and a right end cover, wherein the pilot valve comprises a pilot valve sleeve, a pilot valve core, a pilot valve body, a pilot fixed stopper and a pilot blade, and the main valve comprises a main valve sleeve, a main valve core, a main valve body, a fixed stopper and a main blade, the connecting plate is mounted on the left end of the steering gear cover, the pilot valve body is concentrically mounted in a cylindrical cavity opened in the left end cover, the right end of the left end cover is mounted on the left end of the cylinder body, the right end cover is mounted on the right end of the cylinder body, and the output shaft of the main valve body passes through the right end cover and extends outward; the present invention has the characteristics of simple structure, easy processing, balanced force on the valve core, large output torque, high transmission ratio efficiency, good dynamic characteristics, linear flow gain, fast response speed and high control accuracy.

The present invention proposes a control method for an LCL type single-phase grid-connected inverter based on circuit energy state, comprising: step 1, obtaining an energy state model of the circuit according to the energy storage law of an energy storage element and selected circuit parameters; step 2, establishing a finite state machine controller for the LCL type single-phase grid-connected inverter, setting an effective state and an initial state, and obtaining a convergence condition and a switching condition of the finite state machine controller based on sliding mode control; step 3, establishing a finite state machine controller according to the finite state machine controller based on sliding mode control, and under a finite frequency condition, making the control variable converge to an equilibrium point within a finite time, that is, the output current of the single-phase grid-connected inverter tracks a given value without deviation.

The invention discloses a virtual synchronous machine active power control method based on angular frequency error proportional feedforward, which is characterized in that an angular frequency error output by a virtual synchronous machine is used for correcting an angle output by the virtual synchronous machine after being subjected to a proportional link, so that transient damping of a system is improved, and the stability of the system is improved. And therefore, active power dynamic oscillation suppression can be realized on the premise that the virtual damping is zero. Due to the fact that the virtual damping can be zero, the active power deviation generated when the power grid frequency deviates can be eliminated, and the active power control precision is improved. Therefore, the method can be applied to the field of virtual synchronous machine control so as to solve the contradiction problem between dynamic oscillation and steady-state deviation existing in conventional virtual synchronous machine active power control, and the active power control precision is improved.

The invention discloses a new energy collection area short circuit capacity demand quantitative analysis method and device. The method comprises the following steps: establishing a new energy delivery system equivalent model; the new energy delivery system equivalent system is obtained from a to-be-analyzed large-scale new energy delivery system equivalent value; analyzing the influence of power distribution on the voltage drop range after the new energy system fails by using the model; generating a thermal power generating unit delivery system equivalent model with the same capacity according to the circuit parameters obtained by the new energy delivery system equivalent model; according to the principle that the steady-state voltage drop range of the same fault is consistent, determining a reactive demand model of the new energy station during the low-voltage ride-through period; and considering the current constraint, and determining the short-circuit capacity demand of the new energy station. According to the new energy collection area short-circuit capacity demand quantitative analysis method and device, the short-circuit capacity demand can be quantified, and the system fault extension range can be effectively reduced.

The present invention discloses a differential flat system design method for staggered parallel Buck converter based on extended state observer, converts the DC system into a differential flat system with a double closed-loop structure through coordinate transformation, performs error feedback control on the differential term in the flat system, and observes and compensates the load current in the outer loop through the extended state observer ESO, thereby suppressing the impact of load side fluctuation on the system, wherein the differential flat system with double closed-loop structure includes a current inner loop differential flat system and a voltage outer loop differential flat system. The present invention improves the system stability and dynamic characteristics, and significantly improves the system stability and ability to resist internal and external disturbances while ensuring current sharing of each phase.

The invention discloses a super-junction MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) device, relates to the technical field of semiconductor power devices, and can improve the anti-interference capability and dynamic characteristics of the super-junction MOSFET device. The super-junction MOSFET device comprises a wafer substrate, a column structure located on the wafer substrate, a polycrystalline silicon gate layer located on the column structure and a source electrode region formed in the column structure, wherein the width of the polycrystalline silicon gate layer is 1. The column structure comprises first columns of a first conductive type and second columns of a second conductive type, and the first columns and the second columns are alternately arranged; a first injection region on the inner ring and a second injection region on the outer ring are arranged below the polycrystalline silicon gate layer, and the first injection region is a first conductive type body region; the second injection region has the first conductive type, is located in the column structure, and is connected with the first column.