75results about How to "Reduce control delay" patented technology

The invention discloses a communication method of a master-slave system and the master-slave system and relates to the master-slave system technology field. The master-slave system comprises one piece of master equipment and a plurality of slave equipment. The master equipment successively sends a roll-call message used for carrying out roll call on the plurality of slave equipment according to a polling time interval and based on a polling sequence, and receives response data sent by the named slave equipment. In an idle period of the polling time interval, a priority communication application period is divided. The master equipment detects whether the slave equipment sends first data in the priority communication application period. If the slave equipment sends the first data in the priority communication application period, the master equipment receives the first data and carries out corresponding processing. By using the communication method and the system, the slave equipment can send data in the idle period of the polling time interval, can apply for priority communication, and can preferentially complete data interaction with a high real-time requirement through adjusting a polling sequence; control time delay generated because communication real-time performance of the master-slave system is not high can be reduced; and a user experience degree is increased.

The invention belongs to the technical field of spatial information, and discloses a hierarchical network operation and maintenance and resource management and control system and method for a giant satellite constellation, and the system comprises a service layer, a global organization layer, a local coordination layer, and a resource layer. The business layer serves as input to drive the operation of the whole system; the global organization layer realizes measurement, operation and control integrated control and decision-making of the whole network; the local coordination layer realizes local management and control decision and management and control slice generation; and the resource layer provides physical resources and physical equipment and realizes resource virtualization. According to the method, the local coordination layer controllers are arranged on the high-orbit satellites or the medium-orbit satellites, so that the arrangement of the local coordination layer controllers is not limited by global station arrangement, the management and control of a large-scale low-orbit satellite constellation are realized, and an approximate calculation formula of the number of the local coordination layer controllers under the scale of the low-orbit satellite constellation is given; and a theoretical basis is provided for satellite constellation system design and controller layout.

The invention discloses a Slip form and repeation-based DFIG control method. The d-axis rotor current and the q-axis rotor current of a DFIG are directly controlled in the slip form control manner. In this way, the decoupling control over the active power and the reactive power of the DFIG is realized, so that the dynamic response capability of the system is greatly improved. According to the technical scheme of the invention, the stator current is adjusted in the repeated control manner, so that the harmonic component of an arbitrary order in the stator current, caused by the harmonic wave of an arbitrary order in the voltage of a power grid, can be eliminated. Therefore, the sinusoidal three-phase stator current output can be balanced. Compared with the conventional control method, the method is better in dynamic adjustment capability, and can inhibit the harmonic stator current of an arbitrary order. Furthermore, the control effect of the DFIG is enhanced. The method can be better applied to the actual condition of the power grid with the harmonic contamination condition thereof to be difficult to forecast.

The invention provides an air conditioner control method and an air conditioner control system. The air conditioner control method and the air conditioner control system obtain posture change data through a user terminal device; the obtained posture change data are sent to a server; the server adjusts the work state of an air conditioner according to the posture change data, a user does not need to manually set parameter adjusting, and control delay is reduced; the user can control the air conditioner to change the air outlet direction by directly adjusting the inclination angle of the user terminal device, the larger the inclination angle is, the larger the air outlet direction change is, the method and the system can meet the user operation habits, meanwhile, the control operation flow is simplified, the tedious control operation is not needed, and the user experience is improved.

The invention discloses a method of suppressing the resonance of a photovoltaic grid-connected system based on improved deadbeat, including the following steps: analyzing the cause of resonance; constructing an improved deadbeat control strategy according to the result of analysis, wherein the improved deadbeat control strategy is to predict the sampling current at a time k+2, calculate the PWM duty ratio Dk+1 of an inverter at a time k+1, and implement the PWM duty ratio Dk+1 in the photovoltaic grid-connected system at the time k+1; and combining the improved deadbeat control strategy with a virtual harmonic impedance method to suppress the resonance of the photovoltaic grid-connected system. The method can be used to suppress the resonance of the system.

The invention provides a method and a device for load balancing of a controller, which is applied to the SDN (Software Defined Network) technology field. The method for load balancing of a controller includes: the controller detects the load information of its own; according to the local load information list, the controller judges whether itself is the most heavily overloaded controller; if the controller is judged as the most heavily overloaded controller, the controller utilizes the load balancing strategy of its own to transmit a load transfer request to the target controller; the controller receives the response of executing switch transfer made by the target controller according to the load transfer request; when the response is judged as permitting the transfer, the controller transfers its own load to the target controller. The invention shortens the time used to realize the load balancing of the controller, and improves the efficiency of load balancing.

The invention relates to a control method and device of electronic equipment, the electronic equipment and a storage medium. The control method of the electronic equipment comprises the following steps: displaying scintillation light corresponding to a preset object; wherein the flicker frequencies of the flicker light corresponding to different preset objects are different; brain waves of a target user are obtained when the preset object is displayed, and the brain waves comprise alpha brain waves and Berda brain waves; determining a concentration value according to the amplitude of the alpha brainwave whose frequency has a first relationship with the flicker frequency and the amplitude of the Bedda brainwave whose frequency has a second relationship with the flicker frequency; and controlling the electronic equipment to execute an operation associated with the corresponding preset object according to the concentration degree value.

This invention discloses a method and a system for permanent magnet synchronous motor high-dynamic response current control. The method comprises: preferably adopting an improved dutyfactor updating strategy, namely updating and calculating a new dutyfactor at the peak value of a calculator in first half control cycle and combining the fact that adopting various current inner ring adjustment strategies according to the characteristics of a q axis and a d axis, realizing feedback values following upper command by half a control cycle ahead of time; adopting predictive control in a torque current ring to connect the pure integration to eliminate the influence caused by inaccurate parameters and adopting PI control in exciting current to grantee the stability and easy reliability of the system. As a result, the invention can further shorten control delay and sensitivity of system parameters.

The invention discloses a multi-sampling method for a single-phase cascaded H-bridge multi-level converter. On the basis of a carrier phase shift pulse width modulation strategy, voltage and current sampling is carried out at the top points and the bottom points of all triangular carriers and the intersection points of all the triangular carriers through the algorithm, and the minimization of thesampling period can be achieved on the premise that volt-second balance in the pulse width modulation process is guaranteed. The algorithm effectively improves the sampling rate of the system, reducesthe control delay of the system, and improves the dynamic characteristics of the cascaded H-bridge multi-level converter. The method is high in flexibility and can be combined with various linear control strategies to improve the performance of the converter controller.

The embodiment of the invention discloses a control method and a portable terminal for a configurable peripheral device. The portable terminal comprises at least two subsystems and at least one configurable peripheral device, when obtaining a right of controlling the configurable peripheral device at first time, a first subsystem of the two subsystems initializes the configurable peripheral device and uses the configurable peripheral device according to distributive first configuration information. The method comprises the following steps of backing up the first configuration information, restoring configuration of the configurable peripheral device according to the first configuration information when the right of controlling the configurable peripheral device is switched from a second subsystem to the first subsystem so as to enable the first subsystem to use the configurable peripheral device. The control method and the portable terminal for the configurable peripheral device just need to implement initialization when the subsystem obtains the right of control at first time, configuration information backed up in the process of initialization is used for configuration of the configurable peripheral device in the following time, therefore control time delay of a system is shortened, and occupation of system resources is reduced.

The invention discloses a switchover device for power distribution, which comprises: a base, in which are provided an accommodation cavity, a support pad, a sliding plate, a follower of a control handle, and three relays corresponding to each phase line of a three-phase power supply line , the first terminals of the controlled ports of the three relays are used to connect the phase lines of the three-phase power supply lines respectively; the second terminals of the controlled ports of the three relays are used to connect to the single-phase power supply lines; The control coil is used to connect the power distribution controller to automatically switch the power distribution state; a mechanical anti-short circuit mechanism for interlocking the actions of the three relays is formed in the base. There is no need for the control delay caused by the confirmation of the electronic control logic by the power distribution controller, thus solving the contradiction between the control delay and the confirmation of the correctness of the control logic during the power supply switching process of the unbalanced three-phase load, and ensuring the correctness of the control logic In addition, the control delay caused by electronic detection during the power distribution switching process is omitted, and the control is reliable and efficient.