39 results about "Phase jump" patented technology

The invention provides a phase jump compensation method and device of a network-forming converter, a terminal and a medium. The method comprises the following steps: calculating an instantaneous power angle compensation amount based on the voltage of a grid-connected point of the grid-forming converter; if the instantaneous power angle compensation amount is greater than a preset threshold value, determining a weighted full feed-forward compensation amount based on a capacitor voltage of the network-constructing converter, and determining a cross decoupling compensation amount based on a bridge arm current of the network-constructing converter; and adding the instantaneous power angle compensation amount, the weighted feed-forward compensation amount and the cross decoupling compensation amount into a voltage control loop of the network-forming converter to obtain a control signal added with phase jump compensation. According to the method, the influence of internal virtual inertia on the output response of the grid-forming converter can be reduced, the change of the power grid is quickly responded, the power grid adaptability of the grid-forming converter is improved, the power grid adaptability comprises the phase angle jump adaptability and the power grid strength SCR adaptability, and an overcurrent fault during phase jump is avoided.

The invention discloses a performance detection device for a network construction type converter suitable for new energy and energy storage, and relates to the field of power conversion equipment testing. The automatic test unit comprises a frequency adjustment test module, a phase jump test module, a short circuit ratio adjustment test module, a broadband harmonic injection test module, an island simulation test module, a source load switching test module and a damping test module. Compared with an existing test platform, the precision in the aspects of frequency, phase, short-circuit ratio adjustment and the like is improved, and the precision of a test result is ensured; testing of various complex working conditions such as isolated island operation, source load switching and broadband harmonic injection is supported, and all key working conditions possibly encountered by the power conversion system in practical application can be simulated; the system has an automatic testing function, various tests are automatically carried out through preset working conditions, a detailed analysis report is generated, and manual intervention is reduced.

The invention belongs to the field of positioning identification, and particularly relates to a handheld equipment label space positioning identification system and method based on the RFID technology, and the system comprises a label signal obtaining module, a moving track module, a label positioning module and a secondary correction module. Wherein the label signal acquisition module acquires a target label signal space by using a dynamic time slot allocation strategy in combination with a phase hopping algorithm; the moving track module obtains a compensated handheld dynamic track point sequence according to a preset target area two-dimensional model and IMU (Inertial Measurement Unit) data; the label positioning module obtains an initial relative position space of the handheld label and the multi-target label according to the target label signal space; and a secondary correction module carries out secondary correction on the initial position space by using the region correction vector space and the corrected antenna gain directional diagram, finally, a required multi-target relative position space is accurately obtained, and efficient and accurate label space positioning identification is realized.

The invention relates to the technical field of data processing, provides a phase control strategy for improving transient stability of a virtual synchronous new energy unit, and aims to solve the problem of phase jump at the moment of a fault through a series of steps of fault detection, phase locking, phase control and frequency locking, fault clearing detection, normal operation recovery and the like. The potential phase tracks the terminal voltage phase in the fault period, the phase difference is kept constant, and power angle divergence is effectively prevented. Meanwhile, the frequency is locked at the power grid frequency, and it is ensured that the system can smoothly switch back to a traditional control strategy after the fault is cleared. According to the strategy, the problem of system instability caused by overlarge phase jump at the moment of fault is effectively solved, the transient stability of the virtual synchronous new energy unit is remarkably improved, and a powerful guarantee is provided for safe and stable operation of a power system.

Methods, systems, and devices for wireless communications are described. A group of transmission-reception points (TRPs) may be configured for joint transmissions to a 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 within multiple slots. The UE identifies one or more phase jumps associated with the reference signaling, where a phase jump includes a difference between a phase of the reference signaling received by the UE during a first slot and a phase of the reference signaling received by the UE during a subsequent slot. The UE transmits, to a network entity, a report including information that is based on the one or more phase jumps, which may support the reception by the UE of one or more joint transmissions from the group of TRPs.

This invention relates to a dual-mode singularity sensing system based on phase jump, comprising a sensing module composed of alternating layers of hyperbolic metamaterials and isotropic first dielectric layers. The sensing module exhibits a continuous-domain bound-state phenomenon when incident light propagates, and this continuous-domain bound-state phenomenon includes the ability to split into a pair of reflecting phase singularities with opposite topological charges. This invention extends singularity sensing technology from single-mode to dual-mode, enabling independent two-step measurements and exhibiting higher robustness to environmental perturbations.

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.

Methods, systems, and devices for wireless communications are described. A group of transmission-reception points (TRPs) may be configured for joint transmissions to a 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 within multiple slots. The UE identifies one or more phase jumps associated with the reference signaling, where a phase jump includes a difference between a phase of the reference signaling received by the UE during a first slot and a phase of the reference signaling received by the UE during a subsequent slot. The UE transmits, to a network entity, a report including information that is based on the one or more phase jumps, which may support the reception by the UE of one or more joint transmissions from the group of TRPs.

The application discloses a kind of based on self-increment order encoding structured light order correction algorithm, the present application can effectively inhibit phase jump error, it can more accurately reconstruct the mutation part of object surface, effectively improve the precision of measurement;The method of the present application is not only suitable for smooth, simple object, but also can effectively deal with surface mutation and complex texture object, it has strong adaptability and wide applicability, by the existing grating realization order self-increment and order noise removal, both can guarantee the data precision of three-dimensional measurement, and can guarantee running processing speed.

The invention discloses a section switch FTU current direction self-adaption method for eliminating regular phase jump. The method comprises the following steps that 1, the FTU of a certain section switch collects # imgabs0 # and # imgabs1 # on the two sides of the section switch under the condition that the section switch is closed, calculates # imgabs2 # in real time, collects # imgabs3 # in real time, calculates a three-phase current phase angle # imgabs4 #, and records the phase angle # imgabs4 #; 2, calculating the phase angle of the three-phase current of the section switch FTU, judging which quadrant of a rectangular coordinate system is operated according to the active power P and reactive power Q flowing through the FTU, and judging and screening load properties; step 3, according to the load change, further screening whether jumping is caused by regular load; and step 4, when the angles of the three-phase current are all crossed quadrant phase jumping of 180 degrees at a certain moment, screening as a power supply mode that the A transformer substation line is transferred to the B transformer substation, and realizing automatic phase reversal in the reference direction of each phase current of each section switch FTU.

A fault grid-forming operation control method and system under SVI grid voltage phase jump. The control method includes: freezing active power integral output, equivalent internal potential phase compensation, and transient overcurrent suppression. If the difference between the grid voltage angular frequency and the self-generated angular frequency is greater than the threshold, the trigger flag is set to 1 and restored to 0 after maintaining the set time. During the period when the flag is set to 1: 1) Freeze the active power integral output to keep the self-generated angular frequency unchanged at the angular frequency of the previous moment before the fault; 2) Equivalent internal potential phase angle compensation, calculate the difference between the grid phase angle and the self-generated phase angle in real time, generate a compensation phase angle, and then generate an equivalent internal potential phase angle. During the fault ride-through period, suppress the transient overcurrent. According to the overcurrent multiple, increase the original virtual impedance by a set multiple, and / or input an additional virtual impedance and multiply it by the inductor current to obtain a compensation voltage. The reshaped instantaneous value of the internal potential is simultaneously subtracted by the compensation voltage and the grid-connected voltage and then enters the virtual impedance and current inner loop control.

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.

The invention discloses a voltage phase jump prediction method and system for a receiving-end power grid of an asynchronous interconnection system, and relates to the technical field of electric power engineering.The method comprises the steps that a network equation is established based on composition structures, distribution characteristics and transient characteristics of receiving-end power grid elements of the asynchronous interconnection system; electrical behaviors of the commutation bus phase of the asynchronous interconnection system under different fault conditions are accurately reflected, and a single-feed-in AC / DC system equivalent model before and after a fault is obtained according to a network equation of a receiving end power grid of the asynchronous interconnection system; solving the equivalent power supply voltage and impedance of the receiving-end power grid before and after the fault and the mutual impedance change between nodes after the fault, and finally calculating the phase jump of the current conversion bus voltage of the receiving-end power grid according to the phase relation of the single-feed-in AC / DC system equivalent model before and after the fault. The problem that in the prior art, a quantization method for phase jump is not accurate enough or dynamic characteristics of phase change cannot be reflected is solved, and a powerful basis is provided for fault analysis, state monitoring and dynamic scheduling of a system.

This disclosure provides systems, methods and apparatuses for compensating for a phase jump in a gap of a transmission received via multiple transmit time intervals (TTIs). A wireless node such as a user equipment obtains a configuration of one or more symbol locations of one or more reference signals before or after a gap during which a phase jump can occur in a transmission to be received via multiple TTIs. The wireless node may obtain an indication of one or more symbol locations associated with the gap during which a phase jump will occur in the transmission to be received via multiple TTIs. The wireless node estimates the phase jump during the gap based on one or more reference signals located before or after the gap.

The present application relates to the technical field of data processing, and provides a phase control strategy for improving transient stability of a virtual synchronous new energy unit, which realizes tracking of the voltage phase of the potential phase during a fault period, maintains a constant phase difference and effectively prevents power angle divergence by a series of steps such as fault detection, phase locking, phase control and frequency locking, fault clearing detection and recovery of normal operation, etc., while locking the frequency at the grid frequency to ensure that the system can smoothly switch back to the traditional control strategy after the fault is cleared. This strategy effectively deals with the system instability problem caused by excessive phase jump at the moment of fault, significantly improves the transient stability of the virtual synchronous new energy unit, and provides a strong guarantee for the safe and stable operation of the power system.

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.

This disclosure provides systems, methods and apparatuses for compensating for a phase jump in a gap of a transmission received via multiple transmit time intervals (TTIs). A wireless node such as a user equipment obtains a configuration of one or more symbol locations of one or more reference signals before or after a gap during which a phase jump can occur in a transmission to be received via multiple TTIs. The wireless node may obtain an indication of one or more symbol locations associated with the gap during which a phase jump will occur in the transmission to be received via multiple TTIs. The wireless node estimates the phase jump during the gap based on one or more reference signals located before or after the gap.

Device, systems and methods implemented in a distributed access architecture that allow a remote device to automatically recover from a phase jump event without resetting. A remote device may recover without resetting when a negative phase jump is detected.

Systems and methods for processing video packets that leave a dejitter buffer of a remote device in a distributed access architecture, in a manner indifferent to whether the remote device is synchronized with, or not synchronized with, a clock in a video core that provides the video packets to the remote device. Also, devices systems and methods implemented in a distributed access architecture that allow a remote device to automatically recover from a phase jump event without resetting. A remote device may recover without resetting when a negative phase jump is detected.

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 discloses a coding structured light order correction algorithm based on self-increasing order, which can effectively restrain phase jump errors, can reconstruct abrupt change parts on the surface of an object more accurately, and effectively improves the measurement precision. The method provided by the invention is not only suitable for an object with a smooth and simple surface, but also can effectively cope with an object with surface mutation and complex textures, has very strong adaptability and wide applicability, and can ensure the data precision of three-dimensional measurement and the operation processing speed by realizing the self-increase of the order and the removal of the order noise through the existing grating.

The present invention discloses a commutation failure suppression strategy that takes into account the voltage phase jump of the commutation bus, which relates to the field of power engineering and control automation technology, including: constructing a phase-locked loop tracking error prediction model based on the voltage phase jump; constructing a commutation failure suppression strategy that occurs during the fault recovery process based on the voltage phase jump according to the phase-locked loop tracking error prediction model; adjusting the parameters of the commutation failure suppression strategy that occurs during the fault recovery process based on the voltage phase jump, and outputting the final commutation failure suppression strategy. The present invention determines that the essential inducing factor of CFFR is the voltage phase jump; designs a control strategy to prevent commutation failure in the LCC-HVDC system, ensuring the stable transmission of the LCC-HVDC and the safe operation of the power system. Accurately compensate for the voltage phase jump caused by the AC fault, so that the thyristors of the LCC-HVDC have sufficient angle compensation to achieve successful commutation.

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.

The present invention discloses a method and system for predicting voltage phase jumps in a receiving-end power grid of an asynchronous interconnected system, relating to the field of electric power engineering technology. A network equation is established based on the composition structure, distribution characteristics, and transient characteristics of the receiving-end power grid components of the asynchronous interconnected system to accurately reflect the electrical behavior of the commutation bus phase of the asynchronous interconnected system under different fault conditions. Based on the network equation of the receiving-end power grid of the asynchronous interconnected system, an equivalent model of a single-feed AC / DC system before and after the fault is obtained. The equivalent power supply voltage and impedance of the receiving-end power grid before and after the fault, as well as the mutual impedance change between nodes after the fault, are solved. Finally, based on the phase relationship of the equivalent model of the single-feed AC / DC system before and after the fault, the phase jump of the commutation bus voltage of the receiving-end power grid is calculated. This solves the problem in the prior art that the quantification method for phase jumps is not accurate enough or cannot reflect the dynamic characteristics of phase changes, thereby providing a strong basis for system fault analysis, state monitoring, and dynamic scheduling.

The present application discloses a signal anomaly detection method, device, equipment and medium, which relates to the field of artificial intelligence, including: obtaining a crystal clock signal to be detected, performing clock signal processing on the crystal clock signal to be detected to obtain the processed clock signal phase information; using a preset phase accumulator to calculate the clock signal phase information to obtain a phase jump variable; judging whether the phase jump variable is greater than a preset historical variable threshold value, if the phase jump variable is greater than the preset historical variable threshold value, then judging that the crystal clock signal to be detected is abnormal. Through the above technical solution of the present application, the accuracy of signal anomaly detection can be effectively improved, the efficiency of signal anomaly detection can be increased, and the signal anomaly detection time can be reduced.

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.

Systems and methods for processing video packets that leave a dejitter buffer of a remote device in a distributed access architecture, in a manner indifferent to whether the remote device is synchronized with, or not synchronized with, a clock in a video core that provides the video packets to the remote device. Also, devices systems and methods implemented in a distributed access architecture that allow a remote device to automatically recover from a phase jump event without resetting. A remote device may recover without resetting when a negative phase jump is detected.

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.