153 results about "Power measure" patented technology

The invention discloses a high-precision electric power measurement method based on an intelligent electric meter, and relates to the technical field of electric power measurement. According to the invention, a plurality of high-precision voltage and current sensors with temperature compensation are uniformly arranged in a circuit, a low-noise front-end conditioning and multi-channel high-resolution ADC synchronous sampling technology is adopted, and a digital phase-locked loop is introduced to realize accurate correction of a sampling clock. And performing multi-stage weighted fusion, time domain instantaneous power calculation and FFT frequency domain decomposition compensation on the acquired data, and finally accurately calculating the real power in a power grid period. According to the method, measurement errors caused by temperature excursion, phase deviation and harmonic interference in the prior art are effectively solved, the measurement precision and stability of the system are remarkably improved, and the method is suitable for high-precision power monitoring in a complex power grid environment.

The invention relates to the technical field of new energy power system control, and relates to a power decoupling method for cooperative control of voltage feed-forward compensation and adaptive virtual impedance. The method comprises the following steps: acquiring a power grid current and a power grid voltage, and calculating a reactive power measured value and an active power measured value of a power grid; virtual synchronous machine control is carried out, and a voltage feed-forward pre-compensation item is introduced into a reactive power control loop; calculating a reactive power control loop after VSG compensation, and obtaining VSG output side voltage and instantaneous angular frequency; self-adaptive virtual impedance control is adopted, a self-adaptive virtual impedance reference value is calculated, line impedance is dynamically adjusted, and a voltage loop input instruction voltage is calculated according to the line impedance; and adjusting the output performance of the inverter according to the instruction voltage. According to the invention, the problem of power fluctuation caused by VSG output voltage amplitude variation is effectively solved, and the dynamic influence of a power coupling item is weakened.

The invention provides a power measuring device and method. A conversion module of the power measuring device is used for converting a voltage to be measured into a first conversion voltage and converting a current to be measured into a second conversion voltage; the standard voltage source is an alternating current quantum voltage source and is used for generating standard quantum voltage of a step waveform; the first analog-to-digital converter / the second analog-to-digital converter is used for obtaining a first voltage difference value / a second voltage difference value based on the standard quantum voltage and the first conversion voltage / the second conversion voltage, and the first voltage difference value / the second voltage difference value is used for compensating the second sampling value / the first sampling value; the processor is used for obtaining to-be-measured power based on the first sampling value and the second sampling value; one of the first analog-to-digital converter and the second analog-to-digital converter is arranged to generate the first voltage difference value or the second voltage difference value, and the first voltage difference value or the second voltage difference value is used for compensating the sampling value of the other one of the first analog-to-digital converter and the second analog-to-digital converter, so that continuous full sampling is realized.

The invention provides a power measurement device and method based on an analog quantum voltage source, and a first standard voltage source in the power measurement device is an analog quantum voltage source and is used for generating a first standard quantum voltage of a sinusoidal waveform; the second standard voltage source is an alternating current quantum voltage source and is used for outputting a second standard quantum voltage of the sine step wave; under the condition that the other end of the switching element is connected with a second standard voltage source, the processor adjusts the first standard quantum voltage based on the second standard quantum voltage; the standard quantum voltage of the alternating-current quantum voltage source is transmitted to the analog quantum voltage source, the difference value of power differential sampling can be reduced through the pure sine wave signal of the analog quantum voltage, continuous measurement is achieved, the requirement for the stability of the power source is lowered, the bi-pass analog quantum voltage source is achieved, and the measurement accuracy is improved. And differential measurement control of different phases of voltage and current is simplified.

The invention relates to an intelligent testing device for a repeating high-power intermediate relay, which comprises a programmable direct-current excitation power supply module for providing starting voltage for the intermediate relay, and is characterized in that the intermediate relay is respectively connected with a high-precision power measurement module and a high-speed action time acquisition module; the high-precision power measurement module and the high-speed action time acquisition module are both connected with the intelligent criterion analysis module, and the intelligent criterion analysis module is connected with the man-machine interaction and communication module. The intelligent testing device for the intermediate relay is compact in structure, convenient to use and accurate in measurement, has intelligent analysis capability, supports various relay brands and models, is compatible with a 220V / 110V system, has good universality and expansibility, can be widely applied to occasions such as acceptance inspection, field maintenance and troubleshooting of a relay protection device, and has wide application prospects. Therefore, the reliability and safety of the operation of the power equipment are improved.

The invention provides a negative sequence voltage control method and a negative sequence voltage control system for a network-constructed converter, and relates to the technical field of network-constructed converter control. Calculating negative-sequence reactive power absorbed by the converter and the maximum negative-sequence reactive power which can be absorbed by the converter under the specified fault working condition, and comparing the negative-sequence reactive power and the maximum negative-sequence reactive power to obtain a negative-sequence active power instruction and a negative-sequence reactive power instruction; performing droop control by using the negative sequence active power instruction; pI control is carried out by using a negative sequence reactive power instruction; when a fault occurs, performing three-phase voltage and current sequence decomposition to obtain a negative sequence voltage amplitude and phase and a negative sequence current amplitude and phase of the converter; and performing power measurement according to the amplitude and phase of the negative-sequence voltage output by the converter and the amplitude and phase of the negative-sequence current to obtain negative-sequence active power and reactive power transmitted between the converter and the power grid.

The embodiment of the present application provides a high-frequency communication terminal performance detection system and related methods. By introducing two independently operable signal test paths, a base station simulator, a carrier coupler, a directional coupler and a first power meter form a signal test path; a base station simulator, a 5G millimeter wave coupler, a 5G millimeter wave receiving antenna and a first power meter form another signal test path. The two test paths can independently perform signal tests, and the upper host control machine summarizes and analyzes the real-time power measurement results of the 5G millimeter wave uplink signal and the real-time power measurement results of the LTE uplink signal, and generates a relevant performance test report. The performance test report records the average time power of the millimeter wave uplink signal and the average time power of the LTE uplink signal corresponding to the high-frequency communication terminal under test. The above architecture has high scalability and configuration flexibility, and can be used to effectively and reliably detect the high-frequency time average power of the uplink signal of the communication terminal.

The present invention discloses an optimized control strategy for the transient characteristics of a distributed generation system, including the following control structures: an output power measurement unit, a parameter controller, a voltage regulation controller, a primary frequency modulation controller, an output power response optimization controller, and SPWM modulation. The distributed generation system realizes functions such as output power monitoring, operating parameter setting, voltage control, primary frequency modulation, inertia and damping simulation, rapid oscillation suppression, and inverter shutdown control through the above control structures. The present invention will solve the problem that when a grid-connected inverter is connected to the end of the power grid, it is vulnerable to frequency fluctuations and generates serious power oscillations, and can effectively optimize the transient response of the system to grid connection and achieve rapid suppression of output oscillations.

A method (1100) of calibrating a power measuring function (516; 716; 946) of a wireless power device (510; 710; 930) is presented. An alternating electric signal is fed (1110) through a wireless power transmitter coil (520; 720; 920) to drive the wireless power transmitter coil at an operating point. Voltage measurements and current measurements are performed (1120) upon said alternating electric signal or upon a current signal resulting therefrom in the wireless power device. A series of voltage values and a series of current values are produced (1130) from the voltage measurements and current measurements. A power value is calculated (1140) from the produced series of voltage values and series of current values. The method then assesses (1150) whether the calculated power value meets a specification. If not, the method introduces (1160) a compensatory change in either of the produced series of voltage values and series of current values to account for a phase shift between the voltage measurements and current measurements at said operating point, and stores (1170) the compensatory change for the wireless power device (510; 710; 940). This enables the power measuring function (516; 716; 946) of the wireless power device (510; 710; 940) to produce wireless power measurement results at said operating point which are consistent with said specification.

The invention provides a distribution line fault positioning precision self-correction method based on a digital twin model, and the method comprises the steps: independently constructing a virtual branch of a parallel admittance structure for each phase for each measurement point node of the digital twin model, and initializing the admittance vectors of all virtual branches; obtaining a three-phase current measured value of the distribution line, a three-phase voltage amplitude measured value and a power measured value of each measuring point node, and a corresponding power theoretical value in the digital twinborn model; obtaining a residual vector between the power measured value and the power theoretical value; assigning a division result of the residual vector and the voltage amplitude square matrix to an admittance vector; and acquiring the virtual power of each virtual branch according to the admittance vector, and correcting the admittance parameter of the distribution line in the digital twinborn model according to the current measured value. According to the method, the digital twin model can continuously and automatically track parameter changes of a physical system through a closed-loop correction mechanism, and the precision and reliability of fault positioning based on the model are ensured.

In various embodiments, a computer-implemented method includes determining a size of a display area of a display panel on which one or more images are being displayed, determining a threshold current value based on the size, measuring a first current drawn by the display panel, determining whether the first current exceeds the threshold current value, and upon determining that the first current exceeds the threshold current value, causing a second current providing power to a light source associated with the display panel to be shut off.

A system (1A-1D), in particular for an aircraft (2), comprises: at least one power supply (Q), at least one consumer (C) which is connected to the at least one power supply (Q) via an electrical connection (14) in order to be supplied with power thereby, a first sensor arrangement (15A) for detecting measured values of an electrical power output by the at least one power supply (Q), a second sensor arrangement (15B) for detecting measured values of an electrical power consumed by the at least one consumer (C), and an evaluation device (16) which is configured to receive the measured values of the electrical power detected by the sensor arrangements (15A, 15B), to use a measured value of the electrical power of the first sensor arrangement (15A) and a measured value of the electrical power of the second sensor arrangement (15B) for a comparison and to output a signal based on the comparison.

The invention relates to a method for determining the AC linear electrical resistance of a steel pipe, comprising the steps of generating an induced current in a portion (4) of the pipe by means of an induction coil (6) centered on a longitudinal axis (XX) of the pipe and traversed by an alternating current, the coil being housed in a ferromagnetic cylinder head (8) to confine the magnetic field over a predefined surface of the pipe portion, measuring the active power dissipated by the pipe portion subjected to the magnetic field, measuring the amplitude of the produced magnetic field, and determining the AC linear electrical resistance of the pipe portion from the measurements of the dissipated active power and the amplitude of the induced magnetic field. The invention also relates to a device (2) for implementing said method.

To provide a method, system, and apparatus for transitioning power.SOLUTION: The power transfer device may be configured to fit securely into a fuse block, fuse holder, and / or the like. Power transfer devices may transfer power from a source to a load, such as connected to a fuse block and / or fuse holder, while also isolating power to prevent power from being fed back to the source. Power transfer devices may be used to perform tests, measurements, and / or analyses (e.g., voltage measurements, power measurements, frequency analyses, system impedance tests, etc.).SELECTED DRAWING: Figure 1A

The invention discloses a single-phase electric reactive power symbol judgment method and system, and the method comprises the steps: calculating a current average value Iavg of a current in a corresponding half period when a voltage phase angle cosine value is smaller than 0, if Iavgt; if Iavglt is greater than 0, the reactive power is greater than 0; if not, the reactive power is less than 0. The method has the advantages of small calculation amount and high accuracy and reliability of reactive power measurement.

The invention discloses a quiet zone performance verification method and device, equipment, a storage medium and a program product. The quiet zone performance verification method comprises: acquiring M * N sets of power measurement data obtained by a standard component in a quiet zone at M positions corresponding to N measurement elements, each set of power measurement data comprising K power values, the N measurement elements comprising at least one measurement element deployed in a non-horizontal plane, and M, N and K being positive integers (310); calculating statistical results respectively corresponding to the M * N groups of power measurement data (320); and determining a ripple performance evaluation result of the quiet zone according to statistical results respectively corresponding to the M * N groups of measurement data (330). By means of the method, for an MIMO OTA system with multiple incoming wave directions, evaluation and verification of the ripple performance of the quiet zone can be comprehensively and effectively achieved.

The application relates to a light shielding device and a power measurement system. The light shielding device comprises: a plurality of light shielding mechanisms, the projections of the plurality of light shielding mechanisms along a first direction are connected in sequence, the projection of the light shielding mechanism along the first direction is located on a to-be-tested mechanism, and the light shielding mechanism is used for shielding the to-be-tested mechanism; and a detection hole, the plurality of light shielding mechanisms surround and construct the detection hole, and the detection hole is used for exposing an active area of the to-be-tested mechanism along the first direction; wherein the positions between two adjacent light shielding mechanisms are adjustable, so as to change the size of the detection hole. Through the technical scheme provided in the application, the problems of complicated operation and low applicability of the light shielding device in the related art can be solved.

The invention discloses a light beam orbital angular momentum spectrum measurement method and device based on power measurement. Reference single-mode orbital angular momentum modes of different orders are introduced to coaxially interfere with a to-be-measured light beam in sequence, then the optical power value of a reference light beam, the optical power value of the to-be-measured light beam and the optical power value of the interfered light beam are measured respectively, and the orbital angular momentum spectrum of the to-be-measured light beam can be deduced reversely. In the analysis process, the orbital angular momentum spectrum of the light beam can be measured only by using the power meter to measure the power of the light beam, the cost is low, the structure is simple, control is easy, and the method can be widely applied to the frontier fields of ultra-large-capacity optical communication, new-system laser detection, high-dimensional quantum information and the like.

The application provides a kind of launch assembly operating state monitoring device, it relates to launch assembly operating state monitoring technical field, including voltage measurement circuit, current measurement circuit, power measurement circuit, operational amplifier circuit, analog-digital conversion circuit, digital input circuit, digital output circuit, communication circuit and processor circuit, each circuit has electrical connection between each other.The application can realize the analog quantity collection of power voltage, power amplifier module working current and radio frequency signal power of launch assembly, power supply undervoltage and overvoltage, overtemperature and the state monitoring of input and output radio frequency signal power, emergency stop, development of receiving gate sleeve signal, gate sleeve output and the control of indication signal, and the communication transceiver with outside, more comprehensively realizes the monitoring and reporting of launch assembly operating state and protection and fault diagnosis function.

An electric power measurement circuit includes: a period measurement circuit that measures a measurement period; a first measurer that measures (i) a first toggle number that is a number by which a signal value indicated by an input signal to a first target circuit has changed and (ii) a first operation period that is a period during which the input signal is valid; a second measurer that measures (i) a second toggle number that is a number by which a signal value indicated by an output signal from the first target circuit has changed and (ii) a second operation period that is a period during which the output signal is valid; and a calculator that calculates the first power consumption of the first target circuit based on the measured first toggle number, the measured first operation period, the measured second toggle number, and the measured second operation period.

To provide a frequency converter for satellite broadcast reception, and a power measurement system provided with the frequency converter, for performing frequency conversion for a satellite broadcasting signal obtained through a satellite broadcast reception antenna.SOLUTION: A frequency converter 1 for satellite broadcast reception according to the invention includes: an interference wave reception antenna 11 having receiving gain in a predetermined image frequency band; channel under interference selection means (an interference wave detection part 12 and a frequency determination part 13 / 13a) for identifying a channel under interference in a satellite broadcasting signal from a reception signal obtained through the interference wave reception antenna 11; frequency conversion means for channel under interference (a second frequency conversion part 17 and a bandpass filter 18) for generating a second intermediate frequency signal regarding the channel under interference by performing frequency conversion for the signal of the channel under interference; and output means (a mixer 21 or the like) for transmitting a signal based on the second intermediate frequency signal regarding the channel under interference to a predetermined home distribution system with one coaxial cable.SELECTED DRAWING: Figure 1

The utility model relates to the field of power meters, and provides a pointer type short-wave power meter, which comprises an input detection circuit, a gear switching circuit, a meter head linear correction circuit, a reference voltage circuit, a power supply circuit and a pointer module, an input radio frequency signal is processed through the input detection circuit, multi-gear processing is carried out on a detected direct current signal through the gear switching circuit, nonlinearity of the detected signal is processed through the gauge head linear correction circuit, the finally output signal directly pushes the pointer module, and the pointer module displays power reading. Therefore, accurate power measurement in an electromagnetic interference environment is realized.

Low-voltage circuit breaker (LS) for a low-voltage AC circuit, comprising: - a voltage sensor (SS) for determining the level of voltage between conductors of the low-voltage AC circuit, - a Rogowski coil (RS1, RS2, RS3, RSN) for determining the magnitude of the electric current of a conductor (L1, L2, L3, N) of the low-voltage alternating current circuit, which outputs an analog voltage (A1, A2, A3, AN) equivalent to the magnitude of the electric current of the conductor, - an interruption unit (UE) with contacts (K) for interrupting the low-voltage alternating current circuit, - a control unit (ETU) connected to the voltage sensor (SS), the Rogowski coil (RS1, RS2, RS3, RSN) and the interruption unit (UE), with a microprocessor (MP), wherein the low-voltage circuit breaker is designed in such a way that if the current and / or current-time limit values ​​of a conductor are exceeded, an interruption of the low-voltage alternating current circuit is initiated, and: - that the Rogowski coil (RS1, RS2, RS3, RSN) is connected to an analog integrator (INT), followed by a first analog-to-digital converter (ADU1) which converts the integrated analog voltage (uc(t)) into a digital signal (P1, P2, P3, PN) so that a sample value of the current is available every X degrees, related to the period of the alternating current, - that the voltage sensor (SS) is connected to a second analog-to-digital converter (ADU2) so that every Y degrees, based on the period of the alternating voltage, a sample value of the voltage (PU) is available which corresponds to the level of the voltage or an equivalent of the level of the voltage at the respective time, - that a power value is calculated from a sampled value of the current (P1, P2, P3, PN) and an interpolated voltage value, wherein the interpolated voltage value is determined from two successive sampled values ​​of the voltage (PU) in such a way that a phase error generated by the Rogowski coil and / or the integrator, related to the electrical current in the conductor, is compensated, so that a power value which is at least approximately free of phase errors is determined.

The invention discloses a low-voltage distribution network state estimation-oriented low-voltage topology tracking method, which comprises the following steps of: acquiring standing book information of a target station area integrated power distribution information system, three-phase voltage and power measurement information of a public assessment ammeter on the secondary side of a distribution transformer, and voltage and power measurement information of a single-phase ammeter user; a multi-target 0-1 variable optimization problem considering minimum power balance and maximum voltage correlation is respectively constructed by three-phase voltage and power measurement information of three-phase electric meter users, a linear weighting method is adopted to integrate into a single-target optimization problem, and a branch and bound technology is adopted to solve so as to identify phases to which the electric meter users belong. And based on the user-phase-change identification result, the transformer area archive information is corrected, and accurate and complete low-voltage topological information is provided for subsequent state estimation and fine management of the distribution network.

The invention is suitable for the technical field of communication, and particularly relates to a chip power tolerance robustness detection method and system and a storage medium. According to the invention, the insertion loss of the first power measurement unit and the insertion loss of the second power measurement unit are calibrated; calculating a first gain value of the chip to be measured according to the first measurement value and the second measurement value; stopping transmitting the input signal to the power amplifier, and recording a second quiescent current of the current second power supply; comparing the first quiescent current with the second quiescent current; calculating a second gain value of the chip to be measured according to the third measurement value and the fourth measurement value; and comparing the first gain value with the second gain value, and judging whether the first comparison value or the second comparison value exceeds a preset comparison value: if so, taking the third measurement value as the tolerance limit value of the chip to be tested. Compared with the prior art, the tolerance of the to-be-detected chip can be accurately detected and evaluated, so that the chip is prevented from being damaged due to the fact that a high-power signal is received.

A power measurement system, especially for a spindle or drive axes of a numerical machine tool, comprises a microcontroller (1), at least one analog-to-digital converter (2) connected to a current sensor (4), wherein the sensor (4) is connected for measurement purposes to an electric motor (5), especially one driving a spindle or drive axes of a numerical machine tool. The subject of the application is also a method of measuring power implemented using a power measurement system.

The application provides a power measurement device and method based on an analog quantum voltage source. The first standard voltage source in the power measurement device is an analog quantum voltage source and is used to generate a first standard quantum voltage in a sinusoidal waveform. The second standard voltage source is an alternating quantum voltage source and is used to output a second standard quantum voltage in a sinusoidal step wave. In the case where the other end of the switch is connected to the second standard voltage source, the processor adjusts the first standard quantum voltage based on the second standard quantum voltage. In the application, the standard quantum voltage of the alternating quantum voltage source is transmitted to the analog quantum voltage source. The pure sinusoidal wave signal of the analog quantum voltage is conducive to reducing the difference value of the power difference sampling, realizing continuous measurement, reducing the requirement for the stability of the power source, and realizing a double-pass analog quantum voltage source, and simplifying the differential measurement control of the voltage and the current in different phases.

The invention relates to the field of power electronics, in particular to a system and a method for measuring power loss of a magnetic element. The system comprises a power measuring unit, a power circuit and a to-be-measured magnetic element which are sequentially connected in series, and further comprises at least two auxiliary magnetic elements which are connected with the to-be-measured magnetic element in parallel, and the auxiliary magnetic elements and the to-be-measured magnetic element are the same in structure; and the control unit is connected with the at least two auxiliary magnetic elements and the power measurement unit, and is used for obtaining the power difference of the at least two auxiliary magnetic elements measured by the power measurement unit before and after the sequential access so as to obtain the power loss representing the magnetic element to be measured. According to the application, the auxiliary magnetic element with the same magnetic core loss as the magnetic element to be measured is constructed, the other loss, except the magnetic core loss, introduced by the auxiliary magnetic element can be neglected, and the power difference of the at least two auxiliary magnetic elements measured by the power measurement unit before and after the connection in sequence is acquired, so that the power loss representing the magnetic element to be measured is obtained.

Described herein are systems, methods, and other techniques for aligning a terminal in a satellite communication system. An indicator of a test slot is sent to the terminal to designate a specific frequency allocation for testing. The satellite obtains a set of multi-slot power measurements based on signals received, including a first signal transmitted by the terminal on the test slot. The measurements are transmitted by the satellite to a ground station in a second signal. A set of power measurements specifically for the test slot are extracted from the multi-slot power measurements. The extracted power measurements are transmitted by a gateway to the satellite in a third signal and then from the satellite to the terminal in a fourth signal. These power measurements are utilized by the terminal to perform pointing and cross polarization alignment and power adjustment.

A shaft power monitoring system based on wireless power supply and micro-strain measurement comprises a rotor, a stator, a wireless power supply system and a display end, the rotor part collects shafting strain signals through a strain gauge, and after signal conditioning and digital processing are completed through a microcontroller, non-contact transmission of data is achieved through a wireless transmitting module; meanwhile, electric energy required by operation is obtained through a wireless power supply receiving end and a rectifying circuit board; the stator part receives and analyzes data transmitted by the rotor through a wireless receiving module, and signal management and state monitoring are carried out by a microcontroller; meanwhile, a rotating speed measuring module arranged in the stator monitors the rotating speed of the shaft system in real time, and continuous and stable energy support is provided for the rotor through a direct-current power supply and a wireless power supply transmitting end. According to the invention, through combination of a high-precision micro-strain measurement technology, wireless power supply and wireless data transmission, technical difficulties of a traditional shaft power measurement system can be effectively solved.