353 results about "Wattmeter" patented technology

The invention relates to the technical field of inverter control, and discloses an inverter output power control method and device, equipment and a storage medium. The method comprises the following steps: performing power frequency fundamental wave extraction and multi-band band-pass filtering on acquired voltage and current sampling data; performing phase compensation, first coordinate transformation and positive and negative sequence decoupling operation on the filtered fundamental wave principal component data; on the basis of a synchronous phase angle and a power grid fundamental wave frequency obtained by positive and negative sequence decoupling operation, carrying out second coordinate transformation, moving average and harmonic power delay difference operation on three-phase current and voltage data of an alpha-beta coordinate system; performing multi-level power calculation, power capacity distribution, error characteristic evaluation and decoupling operation on the inversion fundamental component and the inversion harmonic component subjected to the difference operation; and performing output signal modulation on the inversion power control quantity of the decoupling operation based on the fundamental wave synchronization phase angle, and generating a power control result. According to the invention, the control performance of the inverter on the output power in actual operation is improved.

The invention discloses an electric energy metering method under power grid waveform distortion, and particularly relates to the technical field of electric energy metering. The problems of false triggering of an energy compensation mechanism, metering deviation and electricity price settlement risks caused by zero-sequence current or false phase drift easily generated in a multipoint grounding or grounding fault power system in the prior art are solved. According to the anomaly identification and control method integrating zero-sequence current frequency domain characteristic analysis and three-phase phase deviation trend consistency judgment, the false phase deviation state is accurately identified through synchronous sampling, frequency domain analysis and trend consistency evaluation of three-phase voltage, three-phase current and neutral line current, and the false phase deviation state is accurately identified. The error compensation behavior is shielded in real time, the fundamental wave power metering mode is switched to, the electric energy metering accuracy is guaranteed through an error backtracking correction mechanism after recovery, and the anti-interference capability and metering reliability of the electric meter under complex working conditions are effectively improved.

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 discloses a response time conduction type testing device and method for a radio frequency channel protection device. The response time conduction type testing device comprises a transient field intensity generating device, an isolator, a directional coupler, a first attenuator, a second attenuator, a third attenuator, a first power meter, a second power meter, a high-speed oscilloscope, a vector network analyzer and a radio frequency channel protection device to be tested. According to the method, the response performance of the protection device under the influence of the transient strong field can be comprehensively, safely and accurately evaluated, the amplitude limiting function of the protection device can still be effectively exerted under the action of the transient strong field with an extremely narrow rising edge, and then subsequent devices, circuits and equipment are prevented from being damaged.

The invention relates to a time-varying power high-precision calculation technology of an electric drive system under strong electromagnetic noise interference, and mainly solves the problem of inaccurate power calculation of the electric drive system under strong electromagnetic environment noise and frequency time-varying fluctuation scenes. According to the core technology, a dominant frequency fluctuation curve of a signal is obtained through dynamic tracking of a dominant frequency, and a dynamic band-pass filter changing along with the dominant frequency of the electric drive system is constructed; suppressing pulse noise by combining amplitude self-adaptive filtering of a nonlinear weighting function; a phase demodulation technology fusing zero crossing point correction and Hilbert transform is adopted to eliminate the phase interference problem caused by complex waveforms and weak noise signals; and finally, establishing a time-varying power physical model based on the sliding window. According to the technology, the power calculation accuracy of the electric driving system under the conditions of strong field environmental noise and continuous main frequency conversion is remarkably improved.

The invention relates to the technical field of electric energy identification, in particular to an energy consumption identification system based on a power transformation aliasing scene, which comprises a disturbance boundary extraction module, a boundary stability judgment module, an aliasing state identification module, a periodic power calculation module and an energy consumption attribution judgment module. According to the method, a voltage sag record with a phase offset characteristic is formed through continuous tracking of the periodic voltage fluctuation starting and ending point indexes, a stable fluctuation judgment mechanism is constructed in combination with offset statistics, and accurate identification of aliasing sections is realized by means of disturbance amplitude and frequency extraction. A power sequence is constructed on the basis of voltage and current synchronous sampling values, period integration is completed, a high-precision calculation result of energy consumption is formed, fine division of cross interference period energy consumption under the condition of no physical isolation is achieved, dependence of external metering equipment is avoided, independent quantization of overlapping load energy consumption is achieved, and the calculation efficiency is improved. And a feasible means is provided for energy efficiency evaluation in a non-intrusive load identification and high-coupling scene.

The invention provides a multi-scale self-adaptive cooperative network construction type energy storage frequency modulation control system and method, and the system comprises a constant-voltage energy storage power supply which is used for providing DC electric energy; the three-phase inverter circuit is used for converting the direct-current electric energy into alternating-current electric energy and outputting the alternating-current electric energy to a power grid or absorbing the electric energy; the power calculator is used for calculating active power and reactive power output to the power grid by the three-phase inverter circuit; the battery SOH dynamic evaluation controller is used for outputting an SOH attenuation rate signal; the active loop controller is used for generating multi-scale adaptive frequency modulation data and sending the multi-scale adaptive frequency modulation data to the pulse adjustment controller; the reactive power ring controller is used for generating reactive power regulation data according to the power grid voltage deviation signal and sending the reactive power regulation data to the pulse regulation controller; and the pulse regulation controller is used for outputting a final pulse regulation instruction and a multi-scale cooperative control command to the three-phase inverter circuit. The oscillation risk is reduced, and long-term stable operation of the power system is guaranteed.

The invention discloses a frequency modulation response analysis-oriented wind power plant improved single-machine equivalence method and system, and belongs to the technical field of power system new energy station modeling. The method aims at solving the problem that a system frequency response characteristic analysis result is distorted when new energy participates in frequency modulation due to the fact that a traditional wind power plant equivalent modeling method oriented to frequency modulation response analysis in current practical engineering cannot adapt to a frequency modulation response analysis scene. According to the method, wind turbine generators in a wind power plant electromagnetic transient model are divided into two groups according to whether the wind turbine generators participate in frequency modulation or not by taking an active output threshold Tp as a grouping point in a steady state, and the frequency modulation power of an equivalent machine is corrected; calculating an improved virtual inertia coefficient and a droop coefficient of the equivalent machine through the corrected frequency modulation power; in addition, the equivalent machine adopts overspeed load shedding control to realize load shedding operation, and cooperates with virtual inertia control and droop control to participate in system frequency modulation. The method is used for single-machine equivalence of the wind power plant.

The invention relates to the technical field of electric power data measurement, and discloses an optimization sampling method of an electric power digital power meter, the power meter and equipment, and the method comprises the steps: firstly constructing and training a sampling prediction model through employing a neural network algorithm, and enabling the model to predict the optimal sampling point position in each sampling period according to an electric power signal generated by a circuit; the method comprises the following steps: collecting historical power signal data, extracting signal features, preprocessing and standardizing, and then marking an optimal sampling point position to form a training data set; and selecting a long-short term memory (LSTM) network model for training, and evaluating the performance of the model by using the verification set. And after training is completed, model deployment is used for subsequent sampling position prediction. And collecting electric power signal data in a tested circuit in real time, extracting features and inputting the features into a prediction model, obtaining an optimal sampling point position list, and applying the optimal sampling point position list to a sampling strategy of a power meter.

A calibration unit comprises a first port which is arranged for being connected to a measurement device; a calibration module comprising at least three different calibration standards for calibrating the measurement device; and a switching module configured to connect the first port with one of the at least three different calibration standards of the calibration module. A daisy chain port is arranged for being connected to a further calibration unit, to an external power meter, or to a device-under-test, DUT. The first port is connectable to the daisy chain port. An internal power meter is arranged within a housing of the calibration unit. The first port is connectable to the internal power meter; or an internal impedance tuner. The first port is connectable to the internal impedance tuner.

A grid-connection pre-synchronization method for a virtual synchronous generator parallel system, and an electronic device. The grid-connection pre-synchronization method for the virtual synchronous generator parallel system comprises: after receiving a pre-synchronization instruction, n virtual synchronous generators start to perform grid-connection pre-synchronization, wherein the grid-connection pre-synchronization comprises frequency and phase pre-synchronization, and amplitude pre-synchronization (S110). The frequency and phase pre-synchronization comprises: calculating control amounts for the frequency and phase pre-synchronization; according to the control amounts for the frequency and phase pre-synchronization, calculating a damping power; according to a mechanical power, an electromagnetic power and the damping power, calculating an output angular frequency difference of the virtual synchronous generators; and according to the output angular frequency difference of the virtual synchronous generator sand a rated angular frequency, determining a power angle of the virtual synchronous generators.

The invention relates to a radio frequency power measurement and calibration system for a non-50-ohm impedance load, and the system comprises a first matcher and a second matcher, the input end of the first matcher is connected with a radio frequency power supply, and the output end of the first matcher is connected with a non-50-ohm device to be measured; the input end of the second matcher is connected with non-50ohm to-be-tested equipment, and the output end of the second matcher is connected with a 50ohm load; a first radio frequency power meter and a second radio frequency power meter, the first radio frequency power meter is installed at the input end of the first matcher, and the second radio frequency power meter is installed at the output end of the second matcher; the two matchers form a conjugate relation by adjusting the adjustable capacitor assembly; by using the conjugate matching principle, the dissipation powers of the two matchers are consistent, so that the total dissipation power is directly calculated based on the measurement values of the two radio frequency power meters, the actual transmission power of the non-50ohm to-be-measured equipment is calculated, the ohm loss and the transmission loss of the matchers do not need to be independently calculated, and the measurement process is greatly simplified.

The invention relates to the field of wind power plant control systems, and particularly discloses a new energy electric field frequency modulation control system, which comprises a data acquisition module used for acquiring operation data of each fan in a wind power plant in real time and acquiring power grid frequency information; the fan characteristic analysis module is used for analyzing operation characteristics of each fan under different working conditions and establishing a fan power-wind speed model and a comprehensive operation characteristic model; and the power calculation and distribution module is used for calculating frequency modulation power required by the wind power plant according to the power grid frequency deviation and the operation characteristics of the fan and distributing the frequency modulation power by adopting an optimization algorithm. According to the new energy electric field frequency modulation control system, through accurate fan characteristic modeling and comprehensive consideration of various factors, a more accurate fan nonlinear operation characteristic model is established, the accuracy of power calculation is greatly improved, and frequency modulation power calculation errors caused by complex fan operation characteristics are effectively reduced.

The embodiment of the invention provides a method, a device and a system for compensating anode voltage and output power of a magnetron, and belongs to the technical field of radiators for microwave heating. The method comprises the following steps: acquiring a current temperature and an anode voltage measurement value of a magnetron; calculating a correction voltage according to the current temperature; determining a temperature change rate according to the correction voltage and / or the anode voltage measurement value; performing PID control on the PWM signal of the magnetron according to the temperature change rate and the target voltage value; judging whether the current temperature is within a safe working interval or not; acquiring a current anode voltage value when the current temperature is out of the safe working interval; calculating theoretical output power according to the anode voltage value; calculating a power difference value between the theoretical output power and the actual output power; judging whether the power difference value is greater than or equal to a difference value threshold value; and calculating a target voltage value according to the theoretical output power and the input power under the condition that the difference value is greater than or equal to the difference threshold value.

The invention discloses an improved flexible direct current fault control method for improving current differential protection adaptability, and belongs to the technical field of power system relay protection and new energy power generation system grid-connected control. The method comprises the following steps: detecting a voltage drop abrupt change signal and a negative sequence voltage signal of a flexible DC output end, and starting a control strategy when the signals are satisfied; detecting a terminal voltage signal and active power of a new energy sending-out terminal, and calculating a new energy side current phase angle and a power angle; calculating a flexible DC side current phase angle control value and a negative sequence dq axis current reference value based on the parameters; and controlling the flexible DC side to output a negative-sequence current corresponding to the negative-sequence dq-axis current reference value, so as to actively adjust the current phase of the flexible DC side, reduce the phase angle difference between the fault current of the flexible DC side and the fault current of the new energy side, and discriminate the internal and external faults of the region through traditional current differential protection. According to the invention, the degree of freedom is controlled and the current phase is adjusted by using the flexible direct-current side negative-sequence current to reduce the phase angle difference of the two sides, so that the problem that the current differential protection adaptability in the double-end weak feedback system is reduced is solved, additional hardware is not needed, and the power grid safety and the new energy stable grid connection are ensured.

The invention discloses a variable current control device of a frequency converter. The variable current control device comprises a main circuit topology and a system-level control module, the system-level control module comprises a power calculation module, a voltage generation module, an active power filter module and a PWM generation module; the power calculation module is used for calculating the reactive power of the frequency converter according to the sampling voltage at the common coupling point and the three-phase compensation current generated by the frequency converter; the voltage generation module is used for performing power control according to reactive power and direct-current side sampling voltage of the frequency converter and generating a three-phase voltage signal; the active power filter module is used for performing harmonic compensation based on the three-phase voltage signal to obtain a modulation voltage signal; and the PWM generation module is used for generating a pulse width modulation control signal according to the modulation voltage signal and inputting the pulse width modulation control signal into the H-bridge circuit. Power control is performed through the system-level control module to realize reactive power compensation, and harmonic compensation is performed on the main circuit topology, so that the electric energy quality of the power supply is improved.

The invention discloses a low voltage ride through control method and device for an energy storage power station under a power grid voltage fault, and the method comprises the steps: carrying out the coordinate transformation of measured three-phase power grid voltage and power grid current, and obtaining a power grid voltage vector and a current vector under a two-phase rotation dq coordinate system; judging a power grid voltage fault state according to the obtained fault detection signal, and calculating the output power of the converter based on the power grid voltage fault state according to the voltage vector and the current vector; calculating a current reference value according to the output power, and adjusting the current reference value by using a virtual admittance current limiting method to obtain a modulation current; modulation voltage is calculated based on the modulation current, and a modulation voltage signal is converted to generate a three-phase switching signal. According to the invention, the current reference value is adjusted through the virtual admittance current limiting method, so that the energy storage converter can suppress transient current impact during the fault period.

The invention discloses a calibration system and a calibration method of a directional coupler. The system comprises an input end assembly, a front-end monitoring assembly and a rear-end measuring assembly which are connected in sequence, the front-end monitoring assembly comprises a first directional coupler, a first power meter and a first matching load; the bandwidth of the first directional coupler comprises the frequency of a microwave signal source to be calibrated and the frequency of a corresponding first harmonic, and the frequency of a second harmonic corresponding to the frequency is outside the bandwidth of the first directional coupler; the rear-end measurement assembly comprises a second directional coupler, a second power meter, a second matching load and a high-power matching load, wherein the second directional coupler is provided with a reference directional coupler and a calibration directional coupler which are used for replacement; the bandwidth of the reference directional coupler is the same as that of the first directional coupler; the bandwidth of the directional coupler for calibration comprises the frequency of the microwave signal source to be calibrated but does not comprise the frequency of the first harmonic corresponding to the frequency, and a calibration factor is determined based on the reading of the power meter.

An apparatus and a system measure electrical power with improved accuracy as a result of compensating for sources of thermal energy that are not caused by the electrical power of the electrical circuit under test. The apparatuses and systems provide a separate electrical signal source (e.g. RF electrical circuits under test) and DC sides. The apparatuses and systems include devices adapted to convert thermal energy into voltages having reversed polarities. The apparatuses and systems are adapted to compensate for temperature changes not caused by the electrical power of the electrical circuit under test (e.g., ambient temperature change and thermal energy transmitted through the signal transmission lines from sources in the electrical circuit).

A power meter includes a housing attached to a conductor, a hall-effect current sensor disposed in the housing and contactlessly sensing a current of a conductor signal transmitted along the conductor, and a voltage sensor disposed in the housing and contactlessly sensing a voltage of the conductor signal.

The invention discloses a rapid power calculation method suitable for an electric energy meter and an acquisition terminal, the electric energy meter and the acquisition terminal, and relates to the technical field of electric power measurement. According to the method, voltage and current signals are sampled, direct-current components are removed, and harmonic interference is suppressed through band-pass filtering; estimating the frequency of the power grid in real time by using zero-cross detection and linear interpolation; processing the filtered voltage and current signals by adopting a delay cancellation model based on a rotation matrix, and eliminating a negative frequency component to generate a corresponding orthogonal vector; and synchronously calculating active power and reactive power through algebraic operation according to the orthogonal vector. According to the method, establishment time delay introduced by a traditional low-pass filter is avoided, rapid tracking of a power value can be achieved when the load power is subjected to step change, electric energy metering deviation in the transient process is effectively reduced, and meanwhile calculation accuracy and robustness under the power grid frequency fluctuation working condition are improved through a frequency self-adaption mechanism.

The invention discloses an equivalent inertia online measurement method, system and device, and a storage medium. The method comprises the following steps: obtaining frequency data and active power data of a grid-connected point in a specific time period before and after disturbance power injection; carrying out smoothing processing on the obtained frequency data and the active power data; determining a frequency steady-state value and an active power steady-state value before and after disturbance; calculating a steady-state power difference value between the active power steady-state values before and after the disturbance and a steady-state frequency difference value between the frequency steady-state values before and after the disturbance; determining an equivalent damping parameter of the to-be-tested unit or the to-be-tested station; calculating the damping power at each moment in the disturbance generation process; calculating inertia power at each moment in the disturbance generation process; calculating the frequency change rate of each moment in the disturbance generation process; and in a selected specific time period, determining the equivalent inertia of the to-be-tested unit or the to-be-tested station.

The invention provides a charging station power distribution method and system, a medium and a program product, and the method comprises the steps: collecting the electric power of other users except a target station in a target scene region to which the target station belongs in real time, and obtaining the first electric power in each time period; for each time period, according to the first electricity consumption power of the time period and the power supply power output by the power supply system in the target scene area, calculating the second electricity consumption power of the target station in the time period; generating a dynamic load constraint curve according to the second electric power of each time period; in response to a charging request of a target station at a target time, querying the dynamic load constraint curve according to the target time, and obtaining a second electric power corresponding to the target time; and counting the total required power of all the charging piles, and determining the charging power allocated to each charging pile by taking the second electricity utilization power as a constraint. The method realizes dynamic distribution of the charging power and avoids overload of the power grid.

The present invention discloses an adaptive underwater low-frequency underwater acoustic transducer impedance matching device, which comprises a main control circuit, which sends a sweep frequency signal to an underwater power amplifier in a configuration stage and performs impedance matching calculation according to an electrical signal collected by an impedance detection circuit; in an adaptive operation stage, calculates an expected sound source response curve according to the transmitting power of the underwater power amplifier, obtains a power deviation in combination with the sound source signal collected by a hydrophone, obtains an impedance angle according to the electrical signal collected by the impedance detection circuit, and then performs impedance matching modification; an impedance array circuit realizes a circuit with adjustable inductance and inductance parameters to output the maximum power of the underwater acoustic transducer; in the configuration stage, the impedance detection circuit collects electrical signals of the impedance array circuit at various frequency points and transmits them to the main control circuit; in the adaptive operation stage, the electrical signals of the transmitting frequency points are collected and transmitted to the main control circuit; and an impedance switching circuit selectively connects the capacitors and inductors in the impedance array circuit by a relay according to the matching impedance of the main control circuit.

The invention relates to a combined machine group active speed change frequency support control method, which is used for a dynamic low-frequency wind power system, and comprises the following steps: calculating a power grid frequency deviation signal; if the power grid frequency deviation signal does not exceed the frequency modulation dead zone, outputting 0 as a first power instruction, and if not, performing frequency support power calculation, and outputting a calculation result as the first power instruction; comparing the power grid active power dispatching instruction with the active power calculation value, and outputting a second power instruction; if the first power instruction is not 0 and the absolute value of the first power instruction is greater than a threshold value, performing power grid frequency support control on the wind power system by using the first power instruction; and if not, performing limited power control on the wind power system by using the second power instruction. Compared with the prior art, active speed increasing and power reducing control of the dynamic low-frequency wind power system can be achieved, more energy reserve can be provided for power grid frequency support while sudden change of the power grid frequency can be rapidly dealt with, and therefore a better power grid support effect is achieved.

The invention discloses a fluctuation load power calculation method suitable for an electric energy meter and an acquisition terminal, the electric energy meter and the acquisition terminal, and belongs to the field of electric energy metering. The method comprises the following steps: continuously and synchronously sampling voltage and current signals of a power grid and filtering high-frequency harmonics; in-phase and orthogonal signals of voltage and current are adaptively estimated on the basis of a state observer under the condition that a direct current component is not removed, and a state estimation vector is obtained; inputting the voltage state estimation vector into a phase-locked loop, and estimating a voltage angular frequency and a phase through dq transformation; and calculating active power and reactive power according to the current state estimation vector, the voltage phase estimation value and the voltage d-axis component. The invention also provides a corresponding electric energy meter and a use and acquisition terminal. According to the method, the power change can be quickly tracked without lag under the fluctuating load working condition, response delay caused by traditional low-pass filtering is avoided, the dynamic metering precision is effectively improved, and the method is suitable for a complex power grid environment containing a direct-current component.

The invention discloses a cooperative control method for a cascaded common DC bus type optical storage system, and the method comprises the steps: 1, collecting the voltage and current of each photovoltaic array, and calculating the output power of each array; 2, collecting the input voltage and current of each H-bridge circuit, and calculating the input power, the average value and the difference value of each H-bridge circuit; 3, calculating a compensation modulation wave of each H-bridge circuit; 4, voltage and current of a common coupling point are collected, and active power and reactive power transmitted between the system and the power grid are calculated; 5, active and reactive power reference values are calculated; 6, calculating the phase angle and the amplitude of the virtual internal potential; 7, calculating the modulation wave of each H-bridge circuit, adding the modulation wave with the compensation modulation wave, and modulating and outputting a driving signal; 8, calculating a reference value of a voltage outer ring of each bidirectional DC / DC converter; and 9, calculating a modulation signal, modulating the modulation signal and outputting a driving signal. According to the invention, the coordination control of the photovoltaic equipment and the energy storage equipment of the cascaded common DC bus type optical storage system can be realized, and the safety and the reliability are improved.