14 results about "Phase jump" patented technology

Methods, systems, and devices for wireless communication are described. A group of transmit-receive points (TRPs) may be configured for joint transmissions to user equipment (UE). At least one of the TRPs may be a reference TRP, and the UE may receive reference signaling from the reference TRP in a plurality of time slots. The UE identifies one or more phase hops associated with the reference signaling, wherein the phase hops include a difference between a phase of the reference signaling received by the UE during the first time slot and a phase of the reference signaling received by the UE during a subsequent time slot. The UE sends a report to a network entity that includes information based on the one or more phase hops, which may support the UE to receive one or more joint transmissions from the TRP group.

The present invention relates a method for controlling a power generating unit connected to an electrical grid, during a fault ride through event, wherein the fault ride through event causes a phase jump in the electrical grid, the method comprises the steps of: measuring a voltage signal of the power generation unit, calculating a phase angle, based on the measured voltage, in a phase look loop (PLL) block, comparing the phase angle with previous measured phase angle, and calculate a phase angle change, detecting if the phase angle change larger than a threshold and changing to an another state by a Fault Ride Through State machine (FRTSM) for which the power generation unit shall operate, after the threshold has been exceeded.

This invention relates to the field of power electronic equipment control technology and discloses a method, apparatus, storage medium, and computer equipment for phase jump fault ride-through. The method includes calculating the power angle difference between the system power angle and the rated power angle of the target grid-type inverter and comparing it with a difference threshold; when a phase jump fault occurs, determining the corresponding power angle compensation value based on the rated power angle and the fault power angle under fault conditions; freezing the active power loop of the target grid-type inverter and applying the power angle compensation value to the output side of the active power loop; and when a current instantaneous value is detected to exceed a preset current threshold, limiting the reference current of the current inner loop of the target grid-type inverter. This method introduces power angle-based adaptive compensation and current limiting into the control loop, has a simple structure, requires no complex parameters, effectively addresses overcurrent and instability problems caused by phase jump faults, and improves system transient stability and fault ride-through capability.

A kind of composite clock establishment method based on atomic clock and millisecond pulsar, reads millisecond pulsar timing observation data, calculates the timing residual of millisecond pulsar;The timing residual of millisecond pulsar is sorted according to the order of reduced julian day;Millisecond pulsar that meets the establishment of millisecond pulsar time is screened out;Whether the timing residual of screened millisecond pulsar is multi-band timing residual is judged;Multi-band timing residual is statistically processed to obtain average timing residual;Average timing residual and timing red noise identification and processing of timing residual that is not multi-band are carried out, to obtain millisecond pulsar time time sequence;Read atomic clock measurement comparison data, carry out frequency and phase jump identification and rough error detection preprocessing, to obtain atomic time time sequence;Millisecond pulsar time and atomic clock time are combined using Vondrak-Cepek combination method to obtain composite clock Q.The composite clock established by the present application has both millisecond pulsar time long-term stability and accuracy, and also has atomic clock time high resolution and medium and short-term stability.

In accordance with some of the techniques described herein, various approaches are provided for inserting a time domain reference signal into a shared channel across the phase jump boundary. For example, a first reference signal may be multiplexed with a shared channel in the time domain before a discrete Fourier transform (DFT) is performed. The reference signal may be transmitted in a symbol before a phase jump. A second reference signal may be multiplexed with a shared channel in the time domain before a DFT is performed. The reference signal may be transmitted in a symbol after the phase jump. Multiplexing the reference signal in the time domain may partly or completely avoid the use of different DFT sizes or channel equalization for phase jump estimation. Accordingly, implementation complexity or processing complexity may be reduced by multiplexing the reference signal with shared channel data before the DFT.

In accordance with some of the techniques described herein, various approaches are provided for inserting a time domain reference signal into a shared channel across the phase jump boundary. For example, a first reference signal may be multiplexed with a shared channel in the time domain before a discrete Fourier transform (DFT) is performed. The reference signal may be transmitted in a symbol before a phase jump. A second reference signal may be multiplexed with a shared channel in the time domain before a DFT is performed. The reference signal may be transmitted in a symbol after the phase jump. Multiplexing the reference signal in the time domain may partly or completely avoid the use of different DFT sizes or channel equalization for phase jump estimation. Accordingly, implementation complexity or processing complexity may be reduced by multiplexing the reference signal with shared channel data before the DFT.

The invention relates to the technical field of transformer equipment protection and operation control, and provides a method and a system for suppressing excitation inrush current and phase jump of transformer switching, which are characterized in that an excitation inrush current suppression mechanism is integrated into a control system of an energy storage converter, and sine wave pulse width modulation is adopted to generate an output voltage waveform. At the moment of switching of the transformer, the controller firstly detects the instantaneous current change of the output end in real time, and when it is monitored that the current value rapidly rises and overcurrent occurs, the modulation depth coefficient is automatically adjusted by adopting a fuzzy logic control algorithm according to an error interval. The modulation depth coefficient is used as a control parameter to determine the amplitude of the output voltage so as to influence the current input intensity. And then, according to a feedback current value, if the detected current is reduced below a rated value, gradually increasing the PWM pulse duty ratio, so that the output voltage is gradually recovered to a normal level, meanwhile, ensuring the continuity and smooth transition of a voltage phase, and finally realizing a control closed loop of the transformer from a switching-on state to a stable operation state.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a first phase change estimation reference signal during a first slot before a phase jump boundary and a second phase change estimation reference signal, a demodulation reference signal (DMRS), or both during the first slot after the phase jump boundary. In some examples, a sequence for the first phase change estimation reference signal, the second phase change estimation reference signal, the DMRS, or any combination thereof may be common to a group of UEs. The UE may perform a phase jump estimation based on decoding the first phase change estimation signal according to the common sequence and decoding at least one of the second phase change estimation signal or the DMRS according to the common sequence, and the UE may receive signaling during a second slot based on performing the phase jump estimation.

The application discloses a phase-locked loop performance optimization method and system based on a sliding average filter, and comprises the following steps: obtaining a relative reference phase change amount in real time through a phase-locked loop based on a sliding average filter; traversing each time, and predicting a power grid fundamental frequency positive sequence phase jump amount at a current traversal time according to the relative reference phase change amount at the current traversal time and the relative reference phase change amount at a first time before the current traversal time; in a time period after a response delay of the filter in a fault and a time period after the filter is removed from the fault and the system restores to a steady state, analyzing a phase compensation amount at each time according to the relative reference phase change amount and the power grid fundamental frequency positive sequence phase jump amount at each time, and compensating the phase of an output signal of the filter by using all the phase compensation amounts. The application considers the response delay of the filter in the case that the fault causes the power grid phase jump, so as to alleviate the problems of phase-locked loop disconnection and slow phase-locked speed.

This invention provides a modulation method for OFDM satellite navigation signals based on phase-hopping, the method comprising: S1, determining an initial discrete phase vector; S2, obtaining several clusters; S3, setting a random number rand∈(0,1), if rand<p1, randomly selecting one cluster from the several clusters and proceeding to S4; otherwise, randomly selecting two clusters from the several clusters and proceeding to S5; S4, obtaining an updated discrete phase vector based on the first subcarrier phase selection vector and proceeding to S6; S5, obtaining an updated discrete phase vector based on the second subcarrier phase selection vector and proceeding to S6; S6, using the discrete phase vector corresponding to the smaller of the two PAPR values ​​as the discrete phase vector output in the current loop; S7, obtaining the discrete phase vector output in the first loop; S8, obtaining the discrete phase vector output in the second loop; S9, obtaining the final discrete phase vector; S10, performing phase-hopping on each subcarrier of the original OFDM navigation signal vector to obtain the OFDM phase-hopping signal vector.

Methods, systems, and devices for wireless communications are described. A first wireless device and a second wireless device may coordinate the presence of a reference signal in one or more symbols of a slot, where the reference signal is associated with phase measurements across a phase jump boundary of the slot. In some aspects, the first wireless device may receive control information that triggers the transmission of the reference signal in the one or more symbols of the slot, where the control information may further indicate the position of the one or more symbols within the slot. In such aspects, the one or more symbols associated with the reference signal may be prior to the phase jump boundary, after the phase jump boundary, or a combination of both. As such, the first wireless device may monitor the one or more symbols, receive the reference signal, and perform the phase measurements.

The application provides a high-sensitivity terahertz sensor based on PT phase transition, adopts a PT phase superstructure surface, the PT phase superstructure surface is a periodic structure composed of PT symmetric superstructure units, wherein the superstructure unit is composed of a dielectric substrate, two annular open resonant rings and a tunable material; the two planes where the two annular open resonant rings are located are perpendicular to each other, one annular open resonant ring is located at the center of the surface of the dielectric substrate, and the other annular open resonant ring is located inside the dielectric substrate; the tunable material is located at the notch of the outer annular open resonant ring, and the phase curve of the cross-polarization of the PT phase superstructure surface presents a significant jump at the EP point caused by external excitation change, and the high-sensitivity sensing of the external excitation is realized by using the nonlinear phase jump; compared with the 2D structure, the application effectively avoids the anti-Hermite coupling, reduces the absorption of the system to the electromagnetic wave, and improves the accuracy and efficiency of the sensing.

The application provides a fast phase unwrapping method based on tail non-convex regularization, and aims at solving the following two technical problems of the existing phase unwrapping algorithm: one is that details are lost due to the discontinuity of the image edge; and the other is that it is difficult to accurately realize phase unwrapping when facing high complexity or large phase jumps. The steps of the application are as follows: based on the wrapped image, a non-convex tail optimization model with box constraint is constructed; the non-convex tail optimization model is solved by using a completely split primal-dual algorithm under the condition that the support set is empty, so that an initial phase is obtained; errors in the initial phase estimation are corrected through tail minimization, and the support set is dynamically updated, so that an unwrapped image is obtained. Compared with the traditional phase unwrapping algorithm, the application combines the non-convex regularization with the tail minimization strategy, so that the accuracy and robustness of the phase unwrapping are improved, and the application has significant superiority in key evaluation indexes such as signal-to-noise ratio and structural similarity.

Methods, systems, and devices for wireless communications are described. A first wireless device and a second wireless device may coordinate the presence of a reference signal in one or more symbols of a slot, where the reference signal is associated with phase measurements across a phase jump boundary of the slot. In some aspects, the first wireless device may receive control information that triggers the transmission of the reference signal in the one or more symbols of the slot, where the control information may further indicate the position of the one or more symbols within the slot. In such aspects, the one or more symbols associated with the reference signal may be prior to the phase jump boundary, after the phase jump boundary, or a combination of both. As such, the first wireless device may monitor the one or more symbols, receive the reference signal, and perform the phase measurements.