33 results about "Nominal frequency" patented technology

The invention belongs to the field of power distribution automation, and relates to a power grid equipment frequency adaptive resampling method based on a dynamic scale factor, and the method comprises the steps: carrying out the point compensation through employing a linear interpolation method when a power grid equipment detects that the number of continuous lost points is smaller than or equal to 3; selecting a voltage signal channel or a current signal channel to carry out zero crossing point detection and real-time frequency calculation; when the real-time frequency obtained through calculation deviates from the nominal frequency, the power grid equipment introduces a dynamic scale factor for resampling, sampling points are increased when the real-time frequency is higher than the nominal frequency, and sampling points are reduced when the real-time frequency is lower than the nominal frequency; writing data obtained by resampling into a calculation annular cache region of the power grid equipment; and performing FFT calculation on the data in the calculation annular cache region to obtain power grid parameters. The sampling interval of the data acquisition unit is dynamically adjusted by increasing or reducing the sampling points, so that the sampling time sequence and the actual signal period are synchronized, the sampling frequency and the real-time frequency are adaptively matched, and the sampling distortion problem under the power grid frequency fluctuation is solved.

A method for controlling a wind power plant (1), the wind power plant (1) comprising one or more generator devices (14) and a grid building component (5) electrically connected to an output terminal (17) of the one or more generator devices (14), the wind power plant (1) comprising an electrical power grid and / or being electrically connected to an electrical power grid (4), and the method comprises: a) determining (S4) a frequency deviation ([Delta] F) of a current frequency (FC) of the respective electrical power grid (4) from a nominal frequency (FN), b) determining (S6) a droop characteristic (27, 28) of the grid building component (5) based on a current power output (PGC) of the one or more generator devices (14), and c) controlling (S7) the power output (PB) of the grid building component (5) based on the determined frequency deviation ([Delta] F) and the determined droop characteristic (27, 28). Therefore, the frequency regulation of the power grid can be improved.

The present application relates to the field of power distribution network sub-regional collaborative control, and particularly relates to a new energy low-frequency load shedding method for power distribution network sub-regional collaborative control. The method comprises the following steps: dividing the power distribution network into different sub-regions, collecting frequency data of each sub-region in real time, triggering a power adjustment mechanism when detecting that the frequency of a sub-region is lower than a nominal frequency, collecting total power output data and current load data of new energy power generation units in each sub-region in real time, calculating power shortage of each sub-region, and classifying the sub-regions based on the power shortage; based on the power shortage of each sub-region and the sub-region classification, performing collaborative optimization between the classified sub-regions through a distributed collaborative power distribution algorithm, and dynamically distributing power adjustment tasks in the power distribution network. The technical problem that the power shortage of each sub-region cannot be accurately calculated in the traditional power distribution network, resulting in difficulty in distinguishing the priority of different regions during scheduling, is solved.

Disclosed are techniques for wireless communication. In an aspect, a server device may obtain a channel frequency of a channel of a transmission-reception point (TRP), a positioning procedure for a user device being performed based on one or more positioning reference signals from the TRP over the channel. The server device may determine a first frequency-scaled filtering distance by applying a frequency-scaled filtering distance model based on the channel frequency, a nominal frequency of the TRP, a first filtering distance, and a decay parameter of the TRP. In an aspect, the first frequency-scaled filtering distance indicates that, based on one or more recorded positions of one or more access points (APs) being within the first frequency-scaled filtering distance from the TRP, the one or more recorded positions of the one or more APs are usable in the positioning procedure for the user device.

In some embodiments, an electric field generator generates an electric field at a nominal frequency. A detector measures, at multiple time points during a measuring period, one or more properties of the generated electric field. In various embodiments, the one or more properties of the electric field change over time due to interactions with a human body in a reactive near-field region of the electric field. From the measured one or more properties, a computation unit determines one or more periodic behaviors (such as a respiration or heartbeat) and one or more non-periodic behaviors (such as movement of a limb). The computation unit also computes, from at least one of the periodic and non-periodic behaviors, one or more physiological parameters of the human body. From the one or more physiological parameters, the computation unit detects one or more symptoms of a condition of the human body.

The invention discloses a water turbine speed regulation system and method based on dynamic modeling, the water turbine speed regulation system comprises a speed regulator model, and the speed regulator model comprises a frequency load controller configured to adjust the load demand of a water turbine set based on the frequency change of a power grid; the frequency load controller compares the power grid frequency with the nominal frequency, and adds the power grid frequency and the nominal frequency with a load set value after passing through a dead zone and an attenuation gain to generate a unit load demand; the gate position controller is configured to control the position of a water inlet gate based on the hydraulic turbine set load demand; the gate position controller is used for comparing the actual gate position with a reference signal and controlling the position of a water inlet gate in a PID (Proportion Integration Differentiation) mode; and the blade pitch angle controller is configured to control the blade pitch angle of the hydraulic turbine based on the load demand of the hydraulic turbine set so as to control the input water flow. The dynamic characteristics of the hydropower station can be reflected more accurately, and the precision and applicability of the model are improved.

De-icing method in a de-icing system (1) of a turboprop (100) comprising a fixed part (2) including an inverter (4) and an anti-icing control unit (7), a rotating part (3) including a rotary control unit (5) and a heating mat (9), and a rotary transformer (8) between the fixed and rotating parts, the method comprising upstream data transfers from the rotary control unit to the anti-icing control unit and downstream data transfers from the anti-icing control unit to the rotary control unit, wherein the method includes encoding steps: downstream data into frequency modulations of a supply voltage provided by the inverter around a predetermined nominal frequency; and upstream data into predetermined series of changes in an electrical power consumed by the rotary control unit.Figure for the abbreviation: [Fig.1].

A method of data transmission includes transmitting a magnetic signal that is modulated with the bit stream, the magnetic signal having a nominal frequency and being formed of a high frequency and a low frequency, the nominal frequency being the average frequency of the magnetic signal. The bit stream is modulated onto the magnetic signal by encoding the bit stream into the magnetic signal, where each bit in the bit stream is represented by a transition between adjoining data symbols formed of K repetitions of of a first state or a second state. The first state of the pair of states includes M / 2 cycles of the nominal frequency with a signal at the high frequency and M / 2 cycles of the nominal frequency with a signal at the low frequency. The second state is complementary to the first state.

The invention relates to an internet-of-things time precision maintaining method based on adaptive compensation, which is applied to internet-of-things equipment and comprises the following steps that: the internet-of-things equipment counts and checks own crystal oscillator frequency according to a received time synchronization pulse per second interval, determines the current crystal oscillator oscillation number per second, and sends the time synchronization pulse per second interval to the internet-of-things equipment; outputting a local pulse per second as the standard output of the time of the Internet of Things equipment; and if the Internet of Things equipment receives three groups of effective time synchronization second pulses within one hour, calculating an arithmetic mean value of the oscillation number of the crystal oscillator corresponding to the three groups of effective time synchronization second pulses, and taking the sum of the arithmetic mean value and the nominal frequency of the crystal oscillator as the corrected oscillation number per second of the crystal oscillator. Compared with the prior art, the method has the advantages of dynamically calculating the oscillation number of the crystal oscillator per second of the Internet of Things equipment, improving the time precision keeping capability of the Internet of Things equipment and the like.

A radar system for locating buried pipes and detecting underground liquid leaks, particularly water leaks, with a square waveguide antenna for emitting orthogonally polarized signals of the same frequency. The invention essentially consists of a radar system (1) with an antenna (4) capable of emitting waves at a nominal frequency towards the ground with two distinct and orthogonal polarizations, and incorporating a measuring element (5) capable of measuring the polarimetric ratio of the received signals according to the two polarizations, in order to deduce from the imbalance between the two received signals the presence of a buried pipe, and where applicable, the presence of liquid leaks, particularly water leaks. Figure for the abstract: Fig. 1

Systems and methods are provided to generate time data according to a nominal frequency and based on an available frequency. A hardware clock of the system can operate according to the available frequency. The system can identify a difference between the available frequency and a nominal frequency. Based on the difference, the system can generate time data according to the nominal frequency. To generate the time data, for each clock cycle of a plurality of clock cycles according to the available frequency, the system can determine whether to increment or maintain a value of the time data for a prior clock cycle of the plurality of clock cycles. The system can perform one or more functions based on the time data.

Markers for use in bodily tissue take a variety of forms, and may include a plurality of ultrasound reflective elements, for example hollow shells filled with air, and a hydrogel that binds the ultrasound reflective elements. The hydrogel may be natural or artificial and may be cross-linked. An ultrasound system advantageously injects variance in a drive signal, that varies a frequency or phase of an ultrasound interrogation signal from a nominal frequency or nominal phase. The amount of variation is preferable one to six orders of magnitude less than the nominal frequency or phase. The ultrasound system can present or detect a twinkling artifact at least in a Doppler mode of operation, resulting from interaction of the varying interrogation signal with the ultrasound reflective elements.

The application discloses a 406 satellite position indication phase modulation method and device, comprising the following steps: S1: selecting at least three stable frequencies as a group according to the FSK modulation mode, generating corresponding intermediate frequencies H, and then adjusting the carrier nominal frequency according to the intermediate frequencies, so that the intermediate adjustment frequency is 406.031MHz, and adjustment information is obtained, including the adjustment frequency corresponding to the original stable frequency, adjustment data, relative frequency offset and phase migration time; S2: processing the 406 satellite position indication message framing signal, and converting it into modulation data according to the adjustment information; S3: correcting the carrier frequency according to the adjustment information, and obtaining the modulation frequency; S4: sending the modulation data by using the modulation frequency, and the modulation frequency corresponds to the modulation data at the same time. The application realizes the phase modulation by using the frequency offset modulation, and the phase modulation can be realized by using the low-cost radio frequency transceiver chip without the phase modulation function.

De-icing method in a de-icing system (1) of a turboprop (100) comprising a fixed part (2) including an inverter (4) and an anti-icing control unit (7), a rotating part (3) including a rotary control unit (5) and a heating mat (9), and a rotary transformer (8) between the fixed and rotating parts, the method comprising upstream data transfers from the rotary control unit to the anti-icing control unit and downstream data transfers from the anti-icing control unit to the rotary control unit, wherein the method includes encoding steps: downstream data into frequency modulations of a supply voltage provided by the inverter around a predetermined nominal frequency; and upstream data into predetermined series of changes in an electrical power consumed by the rotary control unit.Figure for the abbreviation: [Fig.1].

The application provides a digital satellite television signal time difference measurement method, which increases a time value measurement process on the basis of the prior art. In the time value measurement process, a time interval Delta N between a data rising edge and a subsequent atomic clock output nominal frequency rising edge is measured by using a time-to-digital converter, so as to improve the time stamp precision. Time code data in the time value corresponding to the time stamp is added, so as to avoid errors above seconds in the time difference calculation process. The application can eliminate the influence of large errors and counter resolution on the measurement precision, improve the time difference measurement resolution to the order of tens of picoseconds, and has high measurement precision and good accuracy.

The present invention discloses a receiver beam correction method, system, device and medium, the method comprising: sampling a satellite signal to obtain a sampled signal; squaring the sampled signal to obtain a squared signal term; performing Fourier transform on the squared signal term to extract a signal spectrum, and judging the Fourier transformed signal frequency point and a decision threshold to obtain the frequency of all signals greater than the decision threshold; calculating a frequency deviation value between a frequency deviation approximation result and a preset nominal frequency value; updating a beamforming pre-weighted vector of a multi-beam satellite navigation receiver, and stripping the frequency deviation value by the pre-weighted vector to convert a corrected beam weighted value. The present invention can adaptively calibrate the frequency deviation in a weighted manner, thereby correcting the beam, and does not require modification of the receiver processing module, thereby saving costs and improving calibration efficiency.

A method for managing a communicating meter supplied by cell, for measuring consumption of a fluid, the meter including a measurement unit. The meter has three operating modes: a nominal operating mode wherein the measurement unit makes measurements at a predetermined nominal frequency, a degraded operating mode wherein the measurement unit makes measurements at a predetermined degraded frequency lower than the nominal, and a minimum operating mode wherein the measurement unit makes measurements at the predetermined degraded frequency, and a control unit of the meter performs the following steps: making an estimation of the remaining capacity of the meter battery; requesting that the meter passes from the nominal to the degraded operating mode when the estimation is below or equal to a first threshold; and requesting that the meter passes from the degraded to the minimum operating mode when the estimation is below or equal to a second threshold.

The invention relates to a cascaded multi-loop phase-locked loop (CMPLL). The cascaded multi-loop phase-locked loop comprises a main loop and a plurality of secondary loops which are arranged according to levels, the primary loop is the highest in a hierarchy, and each secondary loop is completed by components of the higher loops in the hierarchy. Each loop of a lower level provides a respective correction signal to correct for any drift in the normative frequency of one or more higher level loops. The CMPLL also includes a set of bypass circuits, each bypass circuit coupled between a first loop and a second loop at least one level higher in a hierarchy, and passing an alternative signal of the first loop as a corresponding correction signal to the second loop when an override layer loop is inoperative.

To reduce temperature hysteresis without complicating the package structure. [Solution] The package comprises a rectangular base plate in plan view, a wall portion provided along the edge of the base plate, and an adhesive pad provided on one end of the inner region enclosed by the wall portion in the direction of the long side; a quartz crystal vibrator having electrodes formed on the front and back surfaces of a rectangular quartz crystal plate in plan view; and a fixing member for fixing the quartz crystal vibrator to the adhesive pad, wherein the value calculated by the following formula is greater than -2.6. -(F1-F2) / (F0) 2 ×1000 However, F1 is the frequency of the quartz crystal plate, F2 is the frequency of the quartz crystal oscillator, and F0 is the nominal frequency.

The invention relates to a de-icing method carried out in a de-icing system (1) for de-icing a turboprop engine (100) comprising a fixed part (2) comprising an inverter (4) and an ice protection control unit (7), a rotating part (3) comprising a rotary control unit (5) and a heating mat (9), and a rotary transformer (8) between the fixed and rotating parts, the method comprising transferring uplink data from the rotary control unit to the ice protection control unit and downlink data from the ice protection control unit to the rotary control unit, wherein the method comprises steps of encoding: a) downlink data into frequency modulations in respect of a supply voltage delivered by the inverter around a predetermined nominal frequency; and, b) uplink data into series of predetermined changes to an electrical power consumed by the rotary control unit.

Techniques for wireless communication are disclosed. In an aspect, a server device may obtain a channel frequency of a channel of a transmit-receive point (TRP), a positioning procedure for a user equipment being performed based on one or more positioning reference signals from the TRP over the channel. The server device may determine a first frequency scaled filter distance by applying a frequency scaled filter distance model based on the channel frequency, a nominal frequency of the TRP, the first filter distance, and an attenuation parameter of the TRP. In an aspect, the first frequency-scaled filtered distance indicates that one or more recorded positions based on one or more access points (APs) are within the first frequency-scaled filtered distance from the TRP, the one or more recorded positions of the one or more APs being usable in a positioning procedure for the user equipment.

Procedure, comprehensive: Receiving a data stream generated by a preceding network node at an intermediate network node, wherein the received data stream includes a constant bit rate carrier data stream (CBR carrier data stream) corresponding to constant bit rate signals (CBR signals) received at a source node; Sampling a counter that accumulates a Physical Layer (PHY) scaled data stream clock (IPSCk) with a nominal sampling period (Tps) of a local reference clock of the intermediate network node to obtain a cumulative PHY scaled count (CPSC) of the received respective data stream, wherein the IPSCk is generated by scaling a clock recovered from the received respective data stream to a predetermined nominal frequency (Fipsc_nom); Calculating a PHY-scaled stream phase offset (PSPO) that specifies the phase difference between a PHY-scaled nominal stream bit count (LPSD) and an incoming PHY-scaled count delta (IPSD), where the IPSD specifies an increment between successive CPSCs; Demultiplexing the received data stream to obtain the CBR carrier data streams, each of the CBR carrier data streams including a cumulative phase offset report of preceding network nodes (CPOR-P) indicating a cumulative phase offset of the preceding network node (CPO-P) and a client rate report (CRR) indicating a measured bit count of a respective CBR client at the source node; Calculating a cumulative phase shift (CPO) for each of the CBR carrier data streams, which depends on the CPO-P for the respective CBR carrier data stream and on the calculated PSPO; Replacing CPO-P in each of the CBR carrier data streams with the calculated CPO for the respective CBR carrier data stream, or a function of the calculated CPO for the respective CBR carrier data stream, to generate an updated CPOR instead of the CPOR-P in the respective CBR carrier data stream; multiplexing the CBR carrier data streams into data streams of intermediate network nodes; and Transferring the data streams of the intermediate network nodes from the respective intermediate network node.

The invention discloses a high-precision phase-locked motor rotating speed control system with dominant frequency compensation. The system comprises a Hall sensor, a rotating speed compensation module, a clock compensation module and a rotating speed control module. The Hall sensor is used for detecting the position of a motor rotor and converting the position into a corresponding rectangular wave as a Hall signal; the rotating speed compensation module is used for calculating to obtain the compensated total control quantity of the motor according to the Hall signal, the real-time dominant frequency of the control system and an externally input first reference square wave signal; the clock compensation module is used for compensating the real-time dominant frequency of the control system according to an externally input second reference square wave signal; and the rotating speed control module is used for generating a corresponding motor driving signal according to the compensated motor total control quantity e. According to the invention, the main frequency clock algorithm compensation is added, the problem of control precision deterioration caused by offset of the main frequency clock from the nominal frequency is solved, and the requirements of some high-precision rotating speed control systems can be met.

A method for controlling a wind power plant (1), the wind power plant (1) comprising one or more generator devices (14) and a grid-forming component (5) electrically connected to an output terminal (17) of the one or more generator devices (14), the wind power plant (1) including an electrical grid and / or being electrically connected to an electrical grid (4), and the method comprising: a) determining (S4) a frequency deviation (ΔF) of a current frequency (FC) of the respective electrical grid (4) from a nominal frequency (FN), c) controlling (S7) the power flow in the wind power plant (1) and grid-forming component (5) based on the determined frequency deviation (ΔF) and a droop characteristic (27, 28) of the grid-forming component (5) relating on a current power output (PGC) of the one or more generator devices (14). Thus, frequency regulation of the grid can be improved.

A method of data transmission includes transmitting a magnetic signal that is modulated with the bit stream, the magnetic signal having a nominal frequency and being formed of a high frequency and a low frequency, the nominal frequency being the average frequency of the magnetic signal. The bit stream is modulated onto the magnetic signal by encoding the bit stream into the magnetic signal, where each bit in the bit stream is represented by a transition between adjoining data symbols formed of K repetitions of a first state or a second state. The first state of the pair of states includes M / 2 cycles of the nominal frequency with a signal at the high frequency and M / 2 cycles of the nominal frequency with a signal at the low frequency. The second state is complementary to the first state.

An electronic device (100, 400), comprising: A first frequency source (108, 401) set up to generate a first oscillation signal, the deviation of which from a nominal frequency of the first frequency source (108, 401) is temperature-dependent, wherein the frequency deviation is the same for a plurality of temperatures lying in different temperature ranges of a plurality of temperature ranges; A processing circuit (402), configured to Determining the temperature range from the plurality of temperature ranges of the electronic device (100, 400) in which a temperature of the electronic device (100, 400) lies, by Determining the temperature range by estimating the frequency deviation of a second oscillation signal generated by a second frequency source (109) from a nominal frequency of the second frequency source (109) and / or determining the temperature range using a temperature sensor (107) of the electronic device (100, 400); and Determining the temperature of the electronic device (100, 400) from an estimate of the frequency deviation of the first oscillation signal from the nominal frequency of the first frequency source (108, 401) taking into account the determined temperature range.

The application provides a data-driven synchronous generator inertia time constant evaluation method, comprising the following steps: obtaining the nominal frequency and active power of a synchronous generator grid connection point, and frequency measurement data; obtaining a frequency deviation value according to the nominal frequency and the frequency, and obtaining an evaluation time when the frequency deviation value is equal to a frequency control dead zone; constructing an active average value expression based on the evaluation time to construct an active change amount expression and further construct a frequency expression to obtain an evaluation function; inversely deducing a theoretical frequency curve according to the frequency expression to correct the time scale of the measurement data; and based on average window integration, calculating the evaluation function according to the time scale corrected measurement data to obtain an inertia time constant evaluation value. The evaluation method provided by the application can reasonably and accurately evaluate the inertia time constant of the synchronous generator on the basis of time scale correction of the measurement data, and has guiding significance for real frequency support capability evaluation of a new energy station.

Markers for use in bodily tissue take a variety of forms, and may include a plurality of ultrasound reflective elements, for example hollow shells filled with air, and a hydrogel that binds the ultrasound reflective elements. The hydrogel may be natural or artificial and may be cross-linked. An ultrasound system advantageously injects variance in a drive signal, that varies a frequency or phase of an ultrasound interrogation signal from a nominal frequency or nominal phase. The amount of variation is preferable one to six orders of magnitude less than the nominal frequency or phase. The ultrasound system can present or detect a twinkling artifact at least in a Doppler mode of operation, resulting from interaction of the varying interrogation signal with the ultrasound reflective elements.

A radio frequency connector includes a first conductor and a symmetric second conductor. Each conductor has an elongated structure of flat conductive material, each conductor has a length corresponding to 1 / 4 of a nominal frequency of a signal to be coupled, and each conductor is connected at a first end to a coaxial connector and at a second end to a housing. The radio frequency connector can be switched between an on state and an off state, wherein in the off state the first conductor is distanced from the second conductor, and in the on state the first conductor is in close contact with the second conductor such that open sides of the housings of the first and second conductors are oriented against each other and the conductors face each other.

The receiver includes a first discrete Fourier transform (DFT) block that performs a first single tone DFT on the positive tones associated with the probe sequence. A second DFT block performs a second single tone DFT on the negative tones associated with the probe sequence. A DFT coefficient generation block generates first DFT coefficients based on the nominal frequency of the positive tones and an estimated frequency offset between the transmitter frequency and the receiver frequency. The DFT coefficient generation block generates second DFT coefficients based on the nominal frequency of the negative tones and the estimated frequency offset. Multipliers in the DFT blocks multiply the I and Q values of the probe sequence with the coefficients. Accumulators in the DFT modules accumulate the multiplier outputs. An arctangent function receives the average accumulated values from the first and second DFT blocks and provides first and second phase values used to calculate the fractional timing.