49 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 RF connector includes a first conductor and a symmetrical second conductor. Each conductor has an elongated structure of a flat conductive material with a length corresponding to ¼ of a nominal frequency of a signal to be coupled and is connected at a first end to a coaxial connector and at a second end to the housing. The RF connector can be switched between an ON state and an OFF state. In the OFF state, the first conductor is distant 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 their respective housings are oriented against each other, and the conductors are facing each other.

Systems, devices, methods, and instructions for operating an electrolyzer, including setting a nominal frequency or a nominal voltage of a connected electrical power system, the electrolyzer being configured to deliver a rated production level at the nominal frequency or the nominal voltage, setting an adjustable dead band at or near the nominal frequency or the nominal voltage, and reducing hydrogen generation and reducing power consumption if the frequency drops below the nominal frequency or if the voltage drops below the nominal voltage.

The invention relates to the field of power distribution network regional cooperative control, in particular to a new energy low-frequency load shedding method for power distribution network regional cooperative control. Comprising the steps of dividing a power distribution network into different sub-regions, collecting frequency data of each sub-region in real time, triggering a power adjustment mechanism when it is detected that the frequency of each sub-region is lower than nominal frequency, collecting total output data and current load data of a new energy power generation unit in each sub-region in real time, calculating power vacancy of each sub-region, and calculating the power vacancy of each sub-region. Classifying the sub-regions based on power vacancy; and based on the power vacancy of each sub-region and the classification of the sub-regions, collaborative optimization is carried out on the classified sub-regions through a distributed collaborative power distribution algorithm, and power adjustment tasks in the power distribution network are dynamically distributed. The technical problem that the priorities of different regions are difficult to distinguish during scheduling due to the fact that the power vacancy of each sub-region cannot be accurately calculated in a traditional power distribution network 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.

Method for adjusting the rate of a basic oscillator of a watch arranged to oscillate at a nominal frequency N0, with a master oscillator generating an excitation frequency NE approximately equal to an integer multiple of this nominal frequency N0, the master oscillator subjecting the watch to excitation or a modulated motion during a transition phase after which the basic oscillator is stabilised at the excitation frequency NE, and a state of display correction method with a winder for mechanical or automatic watches, moving a support carrying the watch and comprising a state of display correction oscillator, having a lower variation of rate value than the initial variation of rate value DI of this basic oscillator, and oscillating at a correction frequency NC to impose oscillation or a motion on the watch, during a state of display correction phase whose duration is adjusted to exactly correct a state of display error measured at the initial moment of actuation.

In some embodiments, an electric field generator includes a differential oscillator that oscillates at a nominal frequency. The electric field generator is connected to a differential antenna that radiates an electric field. A differential detector measures a frequency of the generated electric field as the electric field interacts with a body (such as a human body) in a reactive near-field region of the electric field. For each of one or more internal components of the body, a computation unit determines a respective periodic behavior in the measured frequency indicative of movement of the internal component. The computation unit also computes, for each of the one or more internal components of the body, a respective rate of movement (such as a heart rate or a respiration rate) of the internal component according to the respective periodic behavior in the measured frequency.

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.

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.

A RF connector includes a first conductor and a symmetrical second conductor. Each conductor has an elongated structure of a flat conductive material with a length corresponding to ¼ of a nominal frequency of a signal to be coupled and is connected at a first end to a coaxial connector and at a second end to the housing. The RF connector can be switched between an ON state and an OFF state. In the OFF state, the first conductor is distant 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 their respective housings are oriented against each other, and the conductors are facing each other.

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.

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 provides a synchronous generator inertia time constant evaluation method based on data driving. The method comprises the following steps: acquiring nominal frequency, active power and frequency measurement data of a synchronous generator grid connection point; obtaining a frequency deviation value according to the nominal frequency and the frequency, and obtaining an evaluation moment when the frequency deviation value is equal to a frequency control dead zone; constructing an active average value expression based on the evaluation time so as to construct an active variation expression, and further constructing a frequency expression so as to obtain an evaluation function; reversely deducing a theoretical frequency curve according to the frequency expression so as to carry out time mark correction on the measurement data; and based on the average window integral, calculating an evaluation function according to the measurement data after the time mark correction to obtain an inertia time constant evaluation value. According to the evaluation method provided by the invention, on the basis of performing time mark correction on the measured data, the inertia time constant of the synchronous generator is reasonably and accurately evaluated by using the disturbed data, and the evaluation method has guiding significance for evaluating the real frequency supporting capability of a new energy station.

The present invention refers to a method for managing a battery (7) coupled to a power grid (1) having a nominal frequency wherein at least one parameter for compensating frequency deviations around the nominal frequency occurring in the power grid (1) is adapted, at predetermined time intervals, according to a state of charge (SoC) of the battery (7) and the amplitude of the frequency deviations during a predetermined duration.

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 invention relates to an electrical network (1100), in particular for a discrete hybrid power plant (1000), comprising: a first network section (1110), which is configured to be connected to at least one wind turbine, to be connected to at least one gas generation plant, and to transmit electrical power generated by the wind turbine to the at least one gas generation plant; a second electrical network section (1120) configured for connection to at least one gas generation facility; and a network converter or network converter (1130), which electrically connects the first network section (1110) and the second network section (1120) to each other and is configured to exchange electrical power bidirectionally between the first network section (1110) and the second network section (1120), wherein the first network section (1110) has a first network nominal frequency (fN1) and a first network nominal voltage (U1) and can be operated by means of the first network frequency (f1) and the first network voltage (U1); the second network section (1120) has a second network nominal frequency (fN2) and a second network nominal voltage (UN2) and can be operated by means of the second network frequency (f2) and the second network voltage (U2). And wherein the first network section (1110) is designed for a first frequency range ([delta] f1) around the network nominal frequency (fN1), in which first frequency range the first network frequency (f1) moves; and the second network section (1120) is designed for a second frequency range ([delta] f2) around the network nominal frequency (fN2), in which second frequency range the second network frequency (f2) moves; wherein the first frequency range ([delta] f1) is larger than the second frequency range ([delta] f2).

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 space or aerial vehicle may be configured to generate an internal signal having a frequency which is syntonised with the frequency of the internal signal generated by a second vehicle. The vehicle may comprise a master oscillator configured to oscillate at a nominal frequency and to generate an oscillator signal (F1) at the nominal frequency, a receiver (Rx-1) configured to receive an inter-vehicle signal, wherein the inter-vehicle signal is generated by the second vehicle by modulating a carrier (C2) with a second oscillator signal (F2), wherein the second oscillator signal is generated by a second master oscillator of the second vehicle configured to oscillate at the nominal frequency. Signal processing circuitry may be provided to demodulate the received inter-vehicle signal to obtain a demodulated signal comprising a received version of the second oscillator signal (F′2), and to generate the internal signal based on a sum frequency comprising the first oscillator signal (F1) and the received version of the second oscillator signal (F′2) as summands.

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.

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.

In some embodiments, an electric field generator generates an electric field at a nominal frequency and a nominal amplitude. The electric field generator is connected to an antenna that radiates the electric field. A detector measures a frequency and an amplitude of the generated electric field as the electric field interacts with a body (such as a human body) in a reactive near-field region of the electric field. For each of one or more internal components of the body, a computation unit determines a respective periodic behavior in the measured frequency corresponding to movement of the internal component. The computation unit also computes, for each of the one or more internal components, a respective rate of the movement of the internal component based on the determined respective periodic behavior in the measured frequency. A gain control circuit adjusts the nominal amplitude according to the measured amplitude.

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.

A wireless communication device can include an oscillator circuit. The oscillator circuit can include an oscillator and measurement circuitry coupled to the oscillator. The measurement circuitry can receive an output signal of the oscillator and measure oscillator error by comparing the output signal of the oscillator to a nominal frequency for an amount of time. The oscillator circuit can further include adjustment circuitry to adjust an oscillator frequency of the oscillator based on the measured oscillator error.