236 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 radio frequency modules, and discloses a radio frequency module power amplifier efficiency test method and system, and the method comprises the steps: connecting a signal generator, a power meter, a spectrum analyzer and a DC power supply with a to-be-tested power amplifier, and obtaining a layered power amplifier efficiency test system; establishing a continuous wave test model and a modulation signal test model to obtain compensation parameter data; inputting a first test signal to the to-be-tested power amplifier to obtain power gain data and standardized efficiency data; inputting a second test signal to the to-be-tested power amplifier to obtain adjacent channel leakage power ratio data; performing total efficiency analysis and isolation efficiency analysis on different working states to obtain a layering efficiency analysis result; and carrying out standardization processing on a hierarchical efficiency analysis result, establishing power measurement error evaluation and efficiency calculation error evaluation, and obtaining a power amplifier efficiency test report, thereby realizing comprehensive evaluation on the efficiency characteristics of the power amplifier in different working states.

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 present disclosure provides a control method and control apparatus for a voltage source-type wind turbine. The control method comprises: performing a proportional-integral-derivative operation on a deviation between a DC bus voltage measurement value and DC bus voltage reference value of a wind turbine to obtain an active power deviation; determining a virtual angular frequency deviation on the basis of the active power deviation; determining a virtual internal potential phase on the basis of the virtual angular frequency deviation; obtaining a d-axis virtual impedance output and an q-axis virtual impedance output by means of inputting a grid-connected current in a dq coordinate system to a virtual impedance module; on the basis of the virtual angular frequency deviation, a reactive power setting value and reactive power measurement value of the wind turbine, a rated voltage amplitude of a grid, the d-axis virtual impedance output and the q-axis virtual impedance output, determining a d-axis component and q-axis component of a modulation voltage; and controlling an injection voltage of a grid-connected point of the wind turbine according to the virtual internal potential phase and the d-axis component and q-axis component of the modulation voltage.

Techniques are provided for jammer detection. A methodology implementing the techniques according to an embodiment includes steering a beam in a specified direction to generate a power measurement, the specified direction selected from a plurality of directions, such that the method comprises scanning through the plurality of directions. The method also includes adaptively steering a null in the specified direction and measuring a gain of the received signal in the null direction. The method further includes calculating a difference between the power measurement and the measured gain and generating a difference-based detection that the received signal is associated with a jammer at the specified direction. The difference-based detection is based on a comparison of the power difference to a power difference threshold value. The power difference threshold value is based on a desired probability of false alarm and probability of detection, and / or desired angular resolution.

A protection circuit for an acoustic filter and / or a power amplifier is disclosed. In one aspect, the protection circuit includes a bidirectional coupler that helps secure a measurement of power at an antenna. The power measurement is compared to a threshold by a detector, and if the power measurement is above the threshold, a signal is sent that causes debiasing of a power amplifier stage, which reduces power levels of signals being amplified by the power amplifier stage and correspondingly lowers the power level going through a filter associated with the power amplifier stage. By lowering the power level going through the power amplifier stage and the filter, both elements are protected against over power conditions allowing functionality to be maintained.

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 embodiment of the invention provides a power measurement circuit, a chip and electronic equipment, and the circuit comprises a current measurement module which is used for measuring a first differential voltage between a first input end and a second input end, so as to determine an input current flowing through a standard resistor; the voltage measuring module is used for measuring a second differential voltage between the first input end and the reference grounding end so as to determine the input voltage of the standard resistor; and the error voltage compensation module is used for compensating the error voltage generated at the first input end in the process of measuring the second differential voltage by the voltage measurement module. According to the invention, the first input end and the second input end are enabled to generate corresponding voltage drops, which is equivalent to reducing the influence of the current consumed by the voltage measurement module on the voltage difference (namely the first differential voltage) between the first input end and the second input end, and finally the measurement precision of the current measurement module is improved.

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.

Arrangement for operating a Pirani pressure sensor (1), comprising a measuring resistor (2), a measuring volume at least partially surrounding the area of ​​the measuring resistor (2), a control unit (4) for controlling the operation of the measuring resistor, including a control for supplying electrical power to the measuring resistor, a measuring unit for recording the resistance value of the measuring resistor (2) with a first temperature calibration memory (5) for a stored temperature calibration function (m1) for converting the resistance value into a temperature value and the temperature value into a value for a measuring pressure at a predetermined power supply, where the control unit (4) includes a power measuring unit for electrical power applied to the measuring resistor (2), a power calibration memory (6) with a stored power calibration function (m2) for converting electrical power supplied at a fixed temperature into a measuring pressure, wherein the control unit has a switching means (7) between a pressure measurement via the temperature calibration function (m1) and a pressure measurement via the power calibration function (m2).

The utility model relates to test equipment, device and system for an energy storage power device. The test equipment comprises a direct current power supply, a to-be-tested power device group and a controller, the to-be-tested power device group comprises a first power device, a second power device and a power inductor, the alternating current side of the first power device is connected with the alternating current side of the second power device through the power inductor, and the direct current side of the first power device and the direct current side of the second power device are electrically connected with the direct current power supply; the controller is in communication connection with the first power device and the second power device; the controller is used for controlling the to-be-tested power device group to carry out active power test and reactive power test. According to the invention, switching between an active power test and a reactive power test can be realized without replacing test equipment, simulation of the to-be-tested power device group in two actual working conditions of active power and reactive power is realized, and then the actual operation life of the to-be-tested power device group is obtained through testing.

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.