22results about How to "Achieve smooth switching" patented technology

The invention discloses a buck-boost converter and a mode switching method and circuit thereof, and the mode switching method comprises the steps: selecting a driving signal from a third driving signal and a first driving signal of a first switching tube according to a boost-buck mode signal and a third driving signal of a third switching tube, filtering the selected driving signal or the voltage division signal of the selected driving signal, comparing the filtered signal with a first reference voltage, and obtaining a closed-loop voltage reduction mode signal according to a comparison result; comparing the output voltage of the buck-boost converter with a second reference voltage, and obtaining an open-loop buck mode signal according to a comparison result; and when both the closed-loop voltage reduction mode signal and the open-loop voltage reduction mode signal are effective, outputting an effective voltage reduction mode signal so as to switch the working mode of the buck-boost converter into the voltage reduction mode in the next switching period, thereby improving the accuracy of judging the working mode of the buck-boost converter and improving the reliability of the buck-boost converter. And smooth switching between the working modes of the buck-boost converter is realized.

The invention relates to a three-phase four-bridge-arm flexible interconnection device and a switching control method, the three-phase four-bridge-arm flexible interconnection device in a back-to-back design is adopted, a main converter station adopts UdcQ control, a slave converter station adopts transient damping VSG control, a power difference value is obtained through a power instruction value and a feedback value of the slave converter station, and the three-phase four-bridge-arm flexible interconnection device and the switching control method are used for switching the three-phase four-bridge-arm flexible interconnection device. An engine power angle is obtained through a rotor mechanical equation, a function relation between the power angle and inverter output is obtained based on a linearization model, a VSG active loop closed-loop transfer function is obtained, a VSG signal model is established, and output power is controlled through an input power instruction and an input system frequency of the VSG signal model. When the operation mode of the flexible interconnection device is switched, smooth transition of voltage and current on the direct current side can be achieved, and inertia and damping support can be provided for a power grid during steady-state operation. Compared with the prior art, the method has the advantages of high stability, high reliability and the like.

The invention provides a working mode switching method of a series-parallel hybrid distribution transformer and a related device. The working mode switching method comprises the following steps: acquiring an electric power parameter; the electric power parameters comprise a current parameter and a voltage parameter; determining a first switching action of the working mode change-over switch based on the current parameter, wherein the first switching action is to switch the working mode from a current and voltage compensation mode to a double-current compensation mode; determining a second switching action of the working mode change-over switch based on the voltage parameter, wherein the second switching action is to switch the working mode from a double-current compensation mode to a current and voltage compensation mode; through the method, smooth switching of the working modes of the series-parallel hybrid distribution transformer can be realized; switching does not depend on control cooperation of a current converter, and the method has the advantages of being simple, reliable and effective.

The application discloses a kind of walking tape deviation correction method, device, equipment and computer readable storage medium, applied to industrial equipment field, the polar piece position data sent by the first sensor working in composite critical region is mirrored and copied and flips to obtain mirror polar piece position data;The diaphragm position data sent by the second sensor working in diaphragm critical region is mirrored and copied and flips to obtain mirror diaphragm position data;In switching region, using the mirror flipping data copied and polar piece position data or diaphragm position data in real time transmission are weighted average to calculate feedback value, to realize the smooth switching of sensor.It avoids the problem that the feedback value of the sensor data calculated in the process of switching the sensor in the prior art may change suddenly, resulting in excessive swing of the deviation corrector and poor deviation correction effect.

An image processing method and device based on multiple cameras, and a computer-readable storage medium, wherein the multiple cameras include a wide-angle camera and a telephoto camera, and the method includes: when focusing is completed, determining the requested zoom ratio and obtaining the current image to be shot; when the requested zoom ratio is in the wide-angle section, obtaining an initial transformation matrix, wherein the initial transformation matrix is ​​used to represent the mapping relationship between the initial wide-angle image and the initial telephoto image, wherein the initial wide-angle image is an image shot by the wide-angle lens at a calibrated distance, and the initial telephoto image is an image shot by the telephoto lens at a calibrated distance; determining the current shooting distance; adjusting the initial transformation matrix according to the current shooting distance and the requested zoom ratio to obtain the current transformation matrix, and processing the image to be shot according to the current transformation matrix. There is no obvious visual jump at the zoom switching point of different cameras, thereby improving the user experience.

The present application relates to the technical field of storage rack, especially to a multifunctional storage rack, comprising a mounting frame, a plurality of storage plates for placing materials are arranged in the mounting frame, the storage plates are hollow structures, and a plurality of through holes are arranged on the top plates of the storage plates, a desiccant circulation system is further included, the desiccant circulation system comprises a storage tank, the storage tank is fixedly connected to the top of the mounting frame, a first feeding pipe is communicated with one side of the storage plate and communicated with the storage tank, a discharging pipe is communicated with the other side of the storage plate, a return pipe is fixedly connected to the side of the mounting frame, the top of the return pipe is communicated with the storage tank through a pipeline, and the bottom of the return pipe is communicated with the discharging pipe, the present application realizes close contact between the desiccant and the materials, breaks the limitation of traditional static placement of the desiccant, and significantly improves the dehumidification efficiency.

The application discloses a control method, device and computer program product of an intelligent mobile terminal, wherein the method comprises: driving a first servo motor through a PID controller of the first servo motor to control the rotating speed and direction of a wheel; driving a second servo motor through a PID controller of the second servo motor to adjust the position of a carrying platform in a horizontal direction; and driving a third servo motor through a PID controller of the third servo motor to adjust the horizontal balance of the carrying platform; wherein the PID controllers of a plurality of first servo motors are connected in series to form a series PID control structure; the PID controller of the second servo motor is connected in parallel, and is connected in parallel with the PID controller of the third servo motor to form a parallel PID control structure. The application significantly improves the accurate controllability of a plurality of servo systems of the intelligent mobile terminal by innovatively applying a series-parallel PID control mode, and ensures the stable performance, maneuverability, flexibility and environmental adaptability of the intelligent mobile terminal under various motion modes.

The invention relates to a vehicle control method, a controller, a system, a related device and a vehicle, and the method comprises the step of carrying out rotating speed control or torque control on a motor of the vehicle based on driving information of the vehicle. According to the method, the appropriate control mode needed by the vehicle is judged according to the driving information of the vehicle, smooth switching between the rotating speed control mode and the torque control mode is achieved, complex driving environment and working condition changes can be dealt with, and stable control over the whole vehicle is facilitated.

The application discloses a carousel and rotating shaft working mode switching control circuit and switching control method, which is characterized in that after the carousel and the rotating shaft are controlled to be in a mechanical zero position, a brake holding control circuit and a carousel rotating shaft signal switching circuit are used to make a multi-component injection molding machine enter a carousel working mode or a rotating shaft working mode based on the opening and closing states of a mode selection switch; when the mode selection switch is in an open state, the brake holding control circuit is used to control a rotating shaft servo motor brake to be in a power-on state, and the carousel rotating shaft signal switching circuit is used to control a carousel 0-degree detection electric eye and a carousel 180-degree detection electric eye in the signal switching module to be in an output state; when the mode selection switch is in a closed state, the brake holding control circuit is used to control a power module to stop outputting power to the rotating shaft servo motor brake, and the carousel rotating shaft signal switching circuit is used to control a rotating shaft servo motor driver to be in an output state, thereby realizing smooth switching of the carousel and the rotating shaft in two different working modes.

The present invention discloses a control method for a four-switch buck-boost converter for a self-generating system, including a converter and a digital controller, wherein the converter samples the input voltage and transmits it to the digital processor, wherein the digital processor determines the current working mode according to the received input voltage, and calculates the small signal input voltage feedforward amount, and feeds the feedforward amount to the duty cycle control amount output by the control loop to suppress voltage disturbance; the controller determines whether the current working mode has changed, and if so, sets the duty cycle control amount to zero and calculates the steady-state duty cycle under the current working mode and assigns it to the duty cycle control amount to achieve stable regulation of the output voltage. The present invention not only eliminates the influence of the input voltage disturbance on the output voltage by introducing dual input voltage feedforward in the control loop, but also achieves smooth switching between four working modes, effectively improving the stability of the output voltage of the four-switch buck-boost converter.

The present application relates to the technical field of equipment collaboration, and discloses a system and method for collaborative work between power supply and communication equipment. The method includes: functional configuration and time slot division of multiple nodes to obtain a power communication collaborative network; real-time monitoring and parameter processing of power grid parameters to obtain comprehensive power grid status information; role allocation and switching control of multiple nodes based on comprehensive power grid status information to obtain a node time slot function allocation scheme; optimization analysis and strategy generation to obtain a global energy allocation plan and its execution strategy; dynamic adjustment of the voltage and power of the node to obtain a dynamic adjustment execution result; based on the dynamic adjustment execution result, distributed collaborative optimization of the multi-node energy management strategy in the power communication collaborative network to obtain a global optimal energy use scheme. The present application can continuously optimize its energy use efficiency and adapt to the ever-changing power grid environment and communication needs.

This invention discloses a control method for improving the transient stability of doubly-fed induction generator (DFIG) wind turbine systems connected to the grid, belonging to the fields of wind power grid connection technology and power system stability control technology. First, a reduced-order model of the system is established to accurately reflect the dynamic behavior during low-voltage ride-through. Based on this model, the attraction domain boundary and maximum power angle constraint are obtained, and then adaptive current reference control is proposed: the rotor d-axis current limit is calculated based on the maximum power angle constraint and the grid voltage, and compared with the original reference generated by maximum power point tracking. The smaller value is taken as the command to achieve adaptive limiting of the rotor current. Simultaneously, transient pitch collaborative control is proposed: the rotor speed is monitored in real time, and when the speed exceeds the safe upper limit, a transient load reduction power command is calculated and the pitch angle is rapidly increased to reduce mechanical torque. This invention can significantly enhance the fault ride-through capability and grid-connected operation reliability of DFIG wind turbines during transient processes such as voltage dips.

The invention discloses an HMM-based indoor and outdoor seamless positioning switching method, and relates to the technical field of navigation positioning, and the positioning switching method comprises the following steps: S1, deploying an outdoor positioning system and an indoor positioning system; s2, dividing a daily activity scene into an indoor scene, an indoor and outdoor mixed area scene and an outdoor scene, namely an optimal hidden state required by the HMM; step S3, establishing an HMM model; s4, the posterior probability distribution of each hidden state in each time step is calculated through Bayesian Inference, and the hidden state with the maximum probability is the optimal hidden state, namely scene state recognition is carried out; step S5, when scene switching is detected, performing auxiliary constraint through angular velocity data provided by a gyroscope sensor by adopting a state keeping mechanism and a motion trail unidirectional constraint method to achieve real-time and high-precision indoor and outdoor seamless positioning; and S6, determining whether to trigger network switching.

The invention relates to a new and old system switching system and method, and the system comprises a global server load balance which is used for carrying out the global load balance of a received service access request; the plurality of first load balancing devices are used for carrying out first load balancing processing on the service access requests sent by the global server load balancing devices; the plurality of second load balances are used for carrying out second load balancing processing on the service access requests sent by the first load balances; and the new system gateway is used for sending the service access request forwarded by each second load balance to a new system server or an old system server for processing. According to the scheme provided by the invention, through double-layer load balancing, when the peripheral system accesses the service system through the old system, the service access request can be automatically forwarded to the new system server or the old system server for processing through the new system gateway carried on the second layer of load balancing, so that smooth switching between the new system and the old system is realized.

The invention provides an emergency power supply control method, a control terminal and a storage medium. The method is applied to the emergency power supply. The emergency power supply comprises a DC power supply module, an AC power supply module, a photovoltaic module, an energy storage module and an inverter. The output end of the direct-current power supply module, the output end of the alternating-current power supply module, the output end of the photovoltaic module, the output end of the energy storage module and the input end of the inverter are all connected to a direct-current bus, and the output end of the inverter is used for supplying power to a load; the control method comprises the steps of determining whether the direct-current power module and the alternating-current power module are connected to a direct-current bus; if the direct-current power supply module is connected to the direct-current bus, or the alternating-current power supply module is connected to the direct-current bus, the photovoltaic module is controlled to operate in a maximum power point tracking mode; and if the direct current power supply module and the alternating current power supply module are not connected to the direct current bus, controlling the photovoltaic module to operate in a constant voltage mode. According to the invention, the photovoltaic module adaptively switches the working modes, so that smooth switching is realized, and the stability of the emergency power supply is improved.

The invention relates to a clutch control method and device, a storage medium and a program product, and relates to the technical field of vehicle control. The method is implemented by a vehicle with an automatic engine start-stop system, and comprises the following steps: predicting uprush rotating speed information of engine restart according to vehicle operation condition information under the conditions that the automatic engine start-stop system works and an engine automatically flames out; determining first oil pressure according to the uprush rotating speed information; the first oil pressure is used for making the output torque of the clutch not larger than the perceptible minimum impact transmission torque; under the condition that the engine automatic start-stop system works and the engine is restarted, the clutch is controlled to be in a semi-linkage state through the electronic pump according to the first oil pressure; acquiring second oil pressure; the second oil pressure is the oil pressure output by the mechanical pump after the engine is restarted; and under the condition that the second oil pressure is equal to the first oil pressure, the clutch is controlled to be in a pressed state through the mechanical pump. According to the invention, the stability of moving forward again after the vehicle stops can be improved.

The invention belongs to but is not limited to the technical field of alternating current motors and driving control, and discloses a series winding motor winding phase sequence switching topological system, a modulation method and an inverter, the series winding motor winding phase sequence switching topological system comprises a first bridge arm L1, a second bridge arm L2, a third bridge arm L3, a fourth bridge arm L4 and bipolar diodes TR1, TR2, TR3 and TR4, the four bipolar diodes are turned on or turned off, and the series winding motor winding phase sequence switching topological system is formed. And the phase sequence of the series winding motor can be changed. And then, a corresponding modulation strategy is switched to realize that the three-phase series winding motor uses a torque output topological structure at low speed and heavy load and uses a rotating speed output topological structure at high speed and light load. By means of switching of the topological structure of the series winding motor, the working interval and efficiency of the series winding motor can be optimized so as to adapt to different operation conditions, and the torque-rotating speed operation domain of the three-phase series winding motor is effectively expanded.

The application relates to the computer technical field, and provides a mode switching method and related device, which are used for improving mode switching efficiency, the method comprises the following steps: in response to a mode configuration operation of a target object on a target authorization mode in a target application program, a mode configuration operation interface containing an initial authorization range and an authorized object adding component is presented; in response to a trigger operation of the target object on the authorized object adding component, an authorized object is acquired, and in the mode configuration operation interface, the target authorization range containing the authorized object is presented; in response to a mode switching operation of the target object on the target authorization mode, a switching success response interface is presented, and the switching success response interface is used for indicating that the authorization mode of the target application program is switched to the target authorization mode. In this way, the smooth switching of the authorization mode is realized by adding the authorized object into the authorization range of the target application program.

The invention discloses an improved droop control method and system based on an energy storage converter and a medium, and relates to the technical field of power electronic micro-grid control. The system comprises an energy storage device port, a power conversion module, an LCL output filter, a power grid port, at least one load port and a system control module, the LCL output filter is connected with a power grid port through a common coupling point; the energy storage converter converts alternating current of the power grid port into direct current and transmits electric energy to the energy storage battery port and the load port; the system control module detects the difference value between the module output power and the reference power through the improved droop control module. The method has good active and reactive power tracking performance, and can provide inertia and damping links for the system, thereby improving the stability of the system. Meanwhile, the control method can realize smooth switching of the energy storage converter between an off-grid operation mode and a grid-connected operation mode.

The invention relates to an industrial automation technology, and provides a task scheduling method and device, electronic equipment and a computer readable storage medium, and the method comprises the steps: obtaining description information of a target algorithm, and an execution demand and a data processing mode for completing a target task; determining a target node according to the execution demand; determining a target driving type according to the node type of the target node and the data processing mode, wherein the target driving type represents an algorithm operation mode matched with the data processing mode; and generating a target instruction according to the description information and the target driving type, and issuing the target instruction to the target node, so that the target node constructs a running environment based on the target instruction and executes a target algorithm in the running environment according to the target driving type to complete the target task. According to the invention, smooth switching of the same set of algorithm logic among different operation environments can be realized.

The invention discloses a steady-state operation control method for an offshore direct-current wind turbine generator. The method comprises the steps that in the first stage, medium-voltage direct-current collection voltage is established and maintained through an offshore direct-current wind turbine generator; and in the second stage, after the offshore centralized booster station is started and takes over the control of the medium-voltage direct-current collection voltage, the offshore direct-current wind turbine generator set is switched to a power output mode, and a lead-lag link is added to a power control link of the machine-side converter, so that the power output is stable. According to the method, the problem of coordination control between the offshore direct-current wind turbine generator and the centralized booster station adopting diode uncontrolled rectification is solved, and stable operation of the system under starting and wind speed fluctuation is realized through two-stage coordination and additional control links.

The invention provides an identity authentication networking method between a low earth orbit satellite and a ground control center. The method mainly comprises three parts of system initialization, networking authentication and key switching. In a system initialization process, a low-orbit broadband satellite can interact with a node of a ground control center through a secure channel to complete registration of identity information, and a secret key is preset between the satellite and a satellite networking authentication system; in the satellite-ground networking authentication stage, the low-orbit broadband satellite and the satellite networking authentication system perform identity authentication through preset key information. In the key switching process, a strict switching time sequence process is designed to provide guarantee for key switching.