21 results about "Wattmeter" patented technology

This invention discloses a method and system for measuring the frequency response of an electro-optic modulator based on a spectral analyzer. The system includes a laser, a 95:5 single-mode fiber splitter, an optical power meter, an electro-optic modulator, a control power supply, an RF signal generator, and a spectral analyzer. The measurement method includes the following steps: calculating a calibration factor to correct optical power drift through optical path splitting, driving the modulator by applying several discrete single-frequency RF points, and measuring the carrier power P0(f) using the spectral analyzer. i ) and the first-order sideband power P1(f i ), and determined by the power ratio R(f) i )=10 (P1‑P0) / 10 Combining the Jacobi–Anger expansion / Bessel function relation, the phase modulation index β(f) is solved by inverse solution. i Then, the phase transfer function H(f) at each frequency point is calculated and fitted. i The continuous frequency response S of the modulator is obtained. 21 This invention simplifies the testing process, reduces reliance on high-speed photodetectors and vector network analyzers, and enables high-precision electro-optic response testing of electro-optic modulators at high frequencies.

A kind of wind power generation system power accurate detection method based on DC offset estimation compensation, comprising the following steps;Step one, grid voltage, current is carried out ADC sampling, obtains sample value;Step two, four successive sampling points are extracted in turn, and every four sampling points are grouped as a group;Step three, take a group of data, remove DC by difference, calculate the intermediate variable related to frequency, provide input for frequency estimation;Step four, the frequency is iteratively updated using the normalized gradient method, and the estimated value of the intermediate variable of the sample data and the frequency is obtained;Step five, estimate the DC offset, amplitude and phase;Step six, based on the estimated DC offset, amplitude and phase, calculate power, eliminate DC interference;Step seven, steps four to six are executed in a loop until the output is stable.The present application can still achieve high-precision measurement of power parameters under complex working conditions of grid voltage subjected to DC offset interference, and enhance the operation reliability of power system.

The application relates to the technical field of radio frequency signal processing, in particular to a radio frequency absorption rate determination method, device and computer readable storage medium. The method comprises the following steps: collecting instantaneous radio frequency output power in a single radio frequency pulse duration at a set time interval; calculating an equivalent pulse width of the single radio frequency pulse according to all the collected instantaneous radio frequency output powers; calculating pulse output energy of the single radio frequency pulse according to the equivalent pulse width; and calculating the radio frequency absorption rate of the radio frequency in a target time length according to the pulse output energy of the single radio frequency pulse. The method collects the instantaneous radio frequency output power of a single radio frequency pulse, determines the equivalent pulse width of the single radio frequency pulse, calculates the radio frequency absorption rate based on the equivalent pulse width, improves the accuracy of the radio frequency absorption rate calculation, and thus more effectively prevents the target, especially the target subjected to magnetic resonance detection, from being damaged due to excessive heat.

This invention discloses a high-precision power reconstruction method and system for low-frequency sampling of electricity meters, belonging to the field of electricity meter sampling. The method includes: acquiring low-frequency sampled current and voltage sequences; obtaining coarse-grained power baseline and residual data by performing two-dimensional phase point pairing and feature vector mining, and reconstructing using Gaussian process regression; importing the current and voltage sequences into a hybrid differential model, and calculating transient power increments through state transition equation propagation analysis; for the residual data, extracting harmonic amplitude, phase, and frequency parameters, and obtaining the power contribution of each harmonic through line impedance mapping inversion; and superimposing the coarse-grained power baseline, transient power increments, and the power contributions of each harmonic to obtain a full-band power sequence. This application solves the technical problem that existing low-frequency sampling electricity meters are unable to capture rapid transient processes, resulting in insufficient full-band power metering accuracy.

This invention discloses a model-free adaptive control method for radio frequency (RF) power control, comprising: real-time acquisition and preprocessing of raw incident and reflected power; dynamic correction of the reference incident power using a piecewise function; calculation of the raw tracking error based on the reference incident power and the incident power, and calculation of the composite error signal by introducing a reflected power penalty term; estimation of the pseudo-gradient vector reflecting the instantaneous influence of each control quantity on the incident power using a projection algorithm based on historical input and output data; calculation of the increment of each control quantity based on the composite error signal and the pseudo-gradient vector; and calculation of the control quantity at the next moment based on the increment. This RF power control method does not require a precise mathematical model of the system; it achieves multi-input adaptive cooperative control by online estimation of the pseudo-gradient vector reflecting the influence of each actuator, effectively improving the system's control accuracy and response speed; and simultaneously achieving smooth and continuous protection of RF power.

A portable recording miniature electric energy meter, including electric energy meter body, electric energy meter body includes display module and measurement module arranged in front and back direction in proper order, the outside of display module is equipped with protective shell, the lower part of protective shell is rotationally provided with first support adjusting plate, the length of first support adjusting plate is adjustable, and the side of first support adjusting plate close to protective shell is connected through first connecting piece, a plurality of plug-in interfaces are formed in the length direction of first support adjusting plate; The side of second support adjusting plate away from protective shell is rotationally provided with second support adjusting plate, and the side surface of second support adjusting plate is provided with angle limiting rod, one end of angle limiting rod is connected with second support adjusting plate, and the other end is plugged into one of plug-in interfaces; The protective shell can avoid the direct contact connection between first support adjusting plate and display module, and the stable triangular structure formed by first support adjusting plate, second support adjusting plate and angle limiting rod is used for supporting and adjusting the angle of electric energy meter body.

The application discloses a control method and system for realizing bridgeless totem-pole PFC full-range ZVS and frequency limitation. The implementation scheme is as follows: input voltage, output voltage and inductor current of the bridgeless totem-pole PFC circuit are collected to obtain input voltage polarity signal and PI voltage loop output power; the additional reverse conduction time of the synchronous tube for realizing ZVS is calculated; the original active tube conduction time of the additional reverse conduction time of the synchronous tube without the synchronous tube and the additional reverse conduction time of the synchronous tube for realizing frequency limitation are calculated; the additional reverse conduction time of the synchronous tube and the active tube conduction time for simultaneously realizing ZVS and frequency limitation are calculated; the dead time is self-defined, and the active tube and the synchronous tube of the bridgeless totem-pole PFC circuit are controlled to act based on the time, the input voltage polarity signal, the additional reverse conduction time of the synchronous tube and the active tube conduction time for simultaneously realizing ZVS and frequency limitation and the inductor current zero-crossing signal. The application can realize high-frequency switch tube full-range ZVS and limit the frequency of the high-frequency tube switch, and can be used in various high-power power electronic circuits.

This invention discloses a PFC-full-bridge LLC resonant converter employing a novel control scheme. The input voltage is controlled by a PFC circuit to track the voltage waveform and optimize the current harmonic coefficients. The PFC circuit acquires the output voltage and voltage reference signal, passes them through a first subtractor into the voltage loop, then through a first multiplier and combines them with the input voltage. After comparison with the input current, the signal enters the current loop, controlling the BOOST converter to obtain the optimized high-voltage DC. This high-voltage DC then enters the subsequent LLC topology, where a BP-PID controller controls the power transistors to obtain the DC voltage required by the user. The BP-PID controller mainly consists of a self-tuning regulator and a load-mode controller. The self-tuning regulator incorporates a BP neural network to adjust parameters for self-stabilization; the load-mode controller acquires electrical signals for power calculation to determine which control scheme is suitable for the load.

This invention discloses a single-phase virtual synchronous machine (VSG) control method with optimized dynamic characteristics, comprising: constructing two sets of orthogonal signals of voltage and current using the SOGI power measurement loop, and calculating the average active power and reactive power; based on the nonlinear and time-varying characteristics of the SOGI single-phase power calculation loop, using a system identification method based on N4SID and PSO algorithms to fit the optimal linearized transfer function of the SOGI power calculation loop; establishing a state-space model of the single-phase VSG system based on the optimal linearized transfer function, and realizing single-phase virtual synchronous machine control through partial state feedback pole configuration. The SOGI power measurement loop linearization method based on system identification in this invention aims to optimize the active closed-loop response characteristics of the single-phase VSG, eliminate low-frequency oscillations, and maintain fast dynamic response capability, and on this basis, performs a precise pole configuration scheme for the single-phase VSG closed loop.

This application provides a precise direct power control device for a dual active bridge converter, relating to the field of power control technology. The device includes: a signal processing module for acquiring real-time electrical signal sequences and performing sampling interference correction; a power calculation module for constructing a dual active bridge power calculation model and obtaining instantaneous transmitted power by inputting a reliable electrical signal sequence; a feedback adjustment module for determining the power error signal and performing direct feedback adjustment; and a parameter determination module for dynamically optimizing the dual active bridge adjustment candidate space based on the dynamic accompanying risk mechanism of the dual active bridge to obtain the dual active bridge adjustment parameters. This application solves the technical problem in the prior art where power control only focuses on power tracking during dynamic adjustment and ignores transient safety risks, leading to potential safety hazards during load changes and thus affecting the operating efficiency of the dual active bridge converter. It effectively suppresses dynamic risks while achieving precise power control, thereby improving the operating efficiency of the dual active bridge converter.

The application discloses a kind of real-time anti-interference detection device and method for short wave signaling antenna feeder system.The device includes digital power meter, high-power radio frequency source, directional coupler, radio frequency isolation selector, first-four radio frequency adapter and master control software module.The method is: starting master control software module, performing system parameter assignment;Through high-power radio frequency source network interface remote reading short wave signaling antenna end directional coupler forward and reverse power value, calculate standing wave value, draw standing wave frequency response curve;Carry out data processing, generate evaluation report, and upload to superior information system;Superior information system determines whether real-time monitoring signaling state, if yes, then real-time monitoring signaling state;Otherwise, close master control software module, end detection.The application realizes real-time, anti-interference monitoring short wave signaling station signaling antenna feeder health status, high safety, strong real-time, high detection accuracy, can accurately feedback the health status of signaling antenna feeder.

The application discloses a control method and system for optimizing frequency modulation of a light storage system based on fuzzy control, and belongs to the technical field of light storage system optimization. The control method for optimizing frequency modulation of the light storage system based on fuzzy control constructs an inertial droop control model, a follow-up factor change model, an output power calculation model, a fuzzy control optimization model and a light storage system coordinated frequency modulation model, and calculates a virtual inertia control participation factor and a droop control participation factor based on the influence of virtual inertia response on frequency disturbance and frequency drop time, so that the values of the virtual inertia coefficient and the droop coefficient are changed by using the virtual inertia control participation factor and the droop control participation factor, thereby the frequency modulation advantage of the energy storage can be fully exerted, the frequency stability of the power system after the wind and light electricity penetration rate is ensured, and the frequency safety and stability problem of the new energy grid-connected system is effectively solved.

This invention discloses a method and device for determining the voltage fluctuation of a submodule capacitor in a modular matrix converter, belonging to the field of flexible low-frequency power transmission technology. By constructing a complete method chain of "electrical quantity acquisition → bridge arm current and power calculation → power-voltage dynamic modeling → analytical derivation of fluctuation," it achieves a systematic and analytical determination of the voltage fluctuation of the bridge arm submodule capacitor. This method eliminates the reliance on simulation or empirical formulas, enabling efficient performance evaluation and parameter optimization in the early stages of design. It also provides key theoretical basis for control strategy design, device stress analysis, and system reliability assessment, significantly improving the scientific rigor, foresight, and economy of frequency converter design.

1. Name of the product in this design: AC power meter. 2. Purpose of this design: For measuring AC current power. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The application relates to the technical field of liquefied natural gas filling equipment control, and particularly discloses an intelligent impeller booster pump regulating control method and system of LNG, which discards a flow sensor, obtains active and reactive power of a motor from a frequency converter, calculates a power factor, a standard deviation and an active power response steepness to determine a high-efficiency preselected area; vibration signals of a pump body are collected, FFT transformation is carried out, sub-leaf frequency band energy is extracted, a normalized cavitation erosion index is calculated, a dynamic safety boundary is determined, a guide vane is normally locked, and only a frequency converter rotating speed is regulated to stabilize an outlet pressure; when efficiency deviates and a safety margin is sufficient, one-way fixed-step guide vane exploration is triggered; and when an upper limit is exceeded, a 2-time-step reverse rollback is executed, and a 24-hour exploration-prohibition area is set. The application does not need a flowmeter, and the frequency of guide vane action is extremely low, so that the pump can be long-term operated in a high-efficiency area near a cavitation safety boundary, operation efficiency, cavitation protection and equipment service life are considered, and the application is suitable for wide-fluctuation working conditions of LNG vehicle filling stations.

This invention provides a multi-channel power metering pulse generator, including a digital-to-analog converter module, a power calculation module, a pulse generation module, and a power line configuration module. The digital-to-analog converter module samples voltage and current signals on the power lines. The input of the power calculation module is connected to the digital-to-analog converter module to obtain the instantaneous power for each channel. The input of the pulse generation module is connected to the power calculation module, converting the instantaneous power sequence obtained by the power calculation module into a pulse signal and outputting a power metering pulse signal. The power line configuration module connects the power calculation module and the pulse generation module, and is used to set the correspondence between the input power lines and the output power pulse signals. This invention can measure voltage and current signals on multiple power lines and output multiple power metering pulse signals, and the correspondence between the input power lines and the output power pulse signals can be flexibly adjusted.

The application relates to the technical field of wireless power transmission, and particularly discloses a dynamic wireless charging system efficiency calculation method and system based on clock synchronization, which is characterized in that a satellite tamed clock is arranged at each of a transmitting end and a receiving end, a first frequency and a second frequency pulse signal and a timestamp signal are generated through the satellite tamed clock, when the control unit of the receiving end or the transmitting end receives the first frequency pulse signal, the second frequency pulse signal is used to start counting, when the count reaches a preset value, the average power of the sampling voltage and the sampling current in the preset value is calculated, and the average power is labeled with a timestamp according to the timestamp signal, when the timestamp labels of the transmitting end and the receiving end are the same, the system efficiency corresponding to the moment is calculated according to the power of the transmitting end and the receiving end. The method and the system use the satellite tamed clock to realize time synchronization of the transmitting end and the receiving end, can accurately calculate the system efficiency, and have a low error.

The present application relates to the technical field of electric variable data compensation, and particularly relates to a kind of dynamic compensation method and system for measurement error of intelligent measurement switch.The method comprises the following steps: based on the original instantaneous current of each sampling point, the equivalent excitation inductance of current transformer, the secondary winding resistance, the resistance value of sampling resistor, the critical current value of magnetic circuit saturation, the phase delay compensation time of each sampling point is calculated;the original instantaneous current is corrected to obtain the real current value of sampling point;based on the original instantaneous voltage of sampling point in the measurement period, the real current value and the phase delay compensation time, the active power of the measurement period is calculated, to realize dynamic compensation of measurement error, which can effectively improve the accuracy of active power calculation of intelligent measurement switch in the process of load dynamic switching.

The present application relates to the technical field of automatic control of hydropower stations, and discloses a method and system for intelligent collaborative control of primary frequency modulation of a hydropower station governor, which comprises constructing a full-plant hydraulic coupling matrix according to pipe network parameters; when the rate of change of power grid frequency exceeds the limit, the pipe network execution module is divided into an active disturbance group and a pressure following group according to the coupling matrix; the active disturbance group is controlled to act to generate a hydraulic transient wave, and the actual water hammer wave speed and pipe wall friction coefficient are calculated; based on the calculated parameters and a characteristic line method calculation program, nonlinear guide vane kinematic trajectory data of the pressure following group are generated; the pressure following group is controlled to perform a phase shift delay operation and output mechanical power, and the total active power is synthesized with the power of the active disturbance group; power tracking residuals are calculated and control references are adjusted. The present application reduces the superposition degree of water hammer waves caused by synchronous action of the unit, weakens power counter-regulation caused by the water hammer effect, and improves the stability of the full-plant primary frequency modulation power output.

This invention belongs to the field of satellite communication technology and discloses a design method for beam control software of a phased array antenna with integrated beam tracking. The steps include: adjusting the phase shift value of the array elements through the beam control module of the antenna array itself, actively controlling the beam to deflect within a preset range near the main axis of the antenna and collecting the power reported by the host, and calculating the corresponding error voltage based on the power reported by the host; the beam control software uses the acquired error voltage value as the core feedback parameter, performs parameter matching query through a lookup table constructed from the actual measured parameters of the antenna at the factory, quickly obtains the beam pointing compensation value, calculates the phase shift value of each array element based on the compensation value and the main beam pointing and sends it down, thereby realizing dynamic beam tracking, and comparing the current error voltage value with the target error voltage value to determine whether to continue beam tracking.

The application relates to a method for calculating the power loss of a power device of a direct-current power supply. The method comprises the following steps: applying a first voltage and a working load to the direct-current power supply to make the direct-current power supply in a working state; obtaining a first temperature of a power device of the direct-current power supply; applying a second voltage and a constant current to the power device and measuring a second temperature of the power device; adjusting the constant current applied to the power device until the measured second temperature reaches the first temperature; calculating a power value of the power device according to the voltage value and the current value of the power device when the second temperature reaches the first temperature, and taking the power value as the power loss of the power device when the direct-current power supply is in the working state; and the second voltage is smaller than the first voltage. The application uses the equivalent temperature measurement method, and the types of instruments and meters used are few, the operation is simple, the power calculation is simplified, the power loss is more accurate, and the high voltage possibly existing is avoided, so that the measurement is safer.