Abstract: A super-resolution three-dimensional optical storage focusing servo device and servo method thereof are provided. The device integrates a light source shaping module, a beam combining module, a zoom layer-selection module, a servo signal detection module, and a drive control module. A coaxial recording beam is formed by combining a solid excitation beam and a hollow inhibition beam, and signals generated by reflection of the solid servo beam from the servo guiding layer are utilized to control the axial movement of the servo objective lens and the recording objective lens. During reading and writing processes, the centers of the dual beams remain consistently aligned, enabling high-speed nanoscale focusing servo.

Abstract: Provided are fault current-limiting control method and device for photovoltaic grid-forming system. The method includes: obtaining voltage amplitude of the common-coupling point and voltage signal and current signal in a stationary synchronous frame system based on voltage signal and current signal of converter at the common-coupling point; determining a fault depth based on the voltage amplitude of the common-coupling point to determine active power reference of the inverter; generating voltage reference value and phase reference value of the inverter based on the voltage signal and the current signal in the stationary synchronous frame system and the active power reference of the inverter, to obtain current reference value through fixed virtual impedance; and obtaining inverter modulating wave based on the current reference value, and obtaining control signal of each switch transistor of the inverter after modulating the inverter modulating wave through SPWM.

Abstract: Provided are fault current-limiting control method and device for photovoltaic grid-forming system. The method includes: obtaining voltage amplitude of the common-coupling point and voltage signal and current signal in a stationary synchronous frame system based on voltage signal and current signal of converter at the common-coupling point; determining a fault depth based on the voltage amplitude of the common-coupling point to determine active power reference of the inverter; generating voltage reference value and phase reference value of the inverter based on the voltage signal and the current signal in the stationary synchronous frame system and the active power reference of the inverter, to obtain current reference value through fixed virtual impedance; and obtaining inverter modulating wave based on the current reference value, and obtaining control signal of each switch transistor of the inverter after modulating the inverter modulating wave through SPWM.

Abstract: A radial servo control device for a super-resolution optical disc includes an excitation light source, a servo light source, an integrated optical path, focusing units, a servo light detecting unit and a drive control unit; the drive control unit presets N detection error reference values with respect to each guide layer trench irradiated by servo light, and controls corresponding positions of the focusing units in N data tracks below each guide layer trench according to a comparison result between a detection result of servo reflected light and the detection error reference values. The device is applicable to a variety of super-resolution optical discs on the basis of stimulated radiation loss microscopy technology, a two-photon absorption technology, and the like, and achieves accurate radial servo control of super-resolution data tracks (<100 nm) without reducing the wavelength of servo light and the width of guide layer trenches.

Abstract: A radial servo control device for a super-resolution optical disc includes an excitation light source, a servo light source, an integrated optical path, focusing units, a servo light detecting unit and a drive control unit; the drive control unit presets N detection error reference values with respect to each guide layer trench irradiated by servo light, and controls corresponding positions of the focusing units in N data tracks below each guide layer trench according to a comparison result between a detection result of servo reflected light and the detection error reference values. The device is applicable to a variety of super-resolution optical discs on the basis of stimulated radiation loss microscopy technology, a two-photon absorption technology, and the like, and achieves accurate radial servo control of super-resolution data tracks (<100 nm) without reducing the wavelength of servo light and the width of guide layer trenches.

Abstract: Systems and methods of reducing transmission time are described. Uniform-sized original packets are generated from a data frame having a payload with an identifier and data. The packets include the identifier, total block number, block index that specifies an order of the packet, and the data. The packets are encoded to form redundant packets with the identifier, block number, block index and redundant data. The available block index for the original and redundant packets are different. The packets are transmitted by individual modems over different channels at transmission rates that are each configured to minimize free space in an input buffer of the modem and are dependent on feedback from the receiver. The feedback indicates a difference between the transmission rate and a reception rate. The encoding rate is dependent on the original packets over the original and redundant packets or a maximum transmission rate over the remaining transmission rates.

Abstract: Systems and methods of reducing transmission time are described. Uniform-sized original packets are generated from a data frame having a payload with an identifier and data. The packets include the identifier, total block number, block index that specifies an order of the packet, and the data. The packets are encoded to form redundant packets with the identifier, block number, block index and redundant data. The available block index for the original and redundant packets are different. The packets are transmitted by individual modems over different channels at transmission rates that are each configured to minimize free space in an input buffer of the modem and are dependent on feedback from the receiver. The feedback indicates a difference between the transmission rate and a reception rate. The encoding rate is dependent on the original packets over the original and redundant packets or a maximum transmission rate over the remaining transmission rates.