14 results about "Voltage coefficient" patented technology

The invention provides a low-voltage severity assessment method and system, and relates to the technical field of low-voltage data processing, and the method comprises the following steps: obtaining the current-day power consumption duration and minimum voltage of a user when a single-day assessment instruction of the user is received; judging whether the lowest voltage is in a first low voltage threshold interval or not; if the minimum voltage is in a first low voltage threshold interval, determining a single-day low voltage coefficient of the user according to the power consumption duration, the minimum voltage, the duration weight and the voltage weight; and if the minimum voltage is not in the first low voltage threshold interval, the user single-day low voltage coefficient is 0. According to the method, the voltage value and the power consumption duration are combined, and the weight is introduced to reflect different influence degrees on the severity of the low voltage, so that the actual influence of the low voltage is reflected, and the reflection precision of the severity of the low voltage is improved.

The application discloses a method for measuring error of low-frequency voltage transformer under high voltage by using standard capacitor, which comprises the following steps: connecting the measured low-frequency voltage transformer and low-frequency standard voltage transformer into a difference loop under preset low voltage to measure low-voltage ratio error and low-voltage phase error; introducing high-voltage standard capacitor and low-voltage standard capacitor under preset high voltage to connect with the measured low-frequency voltage transformer into an equal power loop to measure first capacitor ratio and first dielectric loss and second capacitor ratio and second dielectric loss; measuring high-voltage capacitor voltage coefficient, high-voltage dielectric loss voltage coefficient, low-voltage capacitor voltage coefficient and low-voltage dielectric loss voltage coefficient by using comparison method; measuring low-voltage capacitor ratio measurement error, low-voltage dielectric loss measurement error, high-voltage capacitor ratio measurement error and high-voltage dielectric loss measurement error by using capacitor rotation method; and calculating high-voltage ratio error and high-voltage phase error of the measured low-frequency voltage transformer under preset high voltage according to the above parameters.

The present application relates to a kind of magnetoelectric coupling test methods of high sensitivity, the method carries out deep integration to series array, dynamic method and lock-in amplifier, comprising: preparing multiple magnetoelectric sensor units with substantially consistent performance on a single chip and electrically in series, one unit top electrode connects the bottom electrode of next unit;Interchangeable magnetic field and adjustable DC magnetic field are applied, and working point is set in magnetoelectric voltage coefficient linear response region by sweep frequency sweep field;With the frequency of alternating magnetic field as reference, phase-sensitive detection demodulation is carried out to series output signal by lock-in amplifier;According to output voltage, alternating magnetic field and material thickness, magnetoelectric voltage coefficient and equivalent magnetic noise are calculated.The method fundamentally improves signal-to-noise ratio, breaks the sensitivity bottleneck in weak signal detection of traditional method, not only strengthens front-end signal, but also better realizes noise suppression, improves applicable scope, improves practicability.

The application discloses an EAST fast control power supply output current control method and device, and the method comprises the following steps: predicting current values after two periods according to EAST fast control power supply output current sampling values; establishing a multi-target optimization cost function with constraint conditions; seeking optimal solutions of the multi-target optimization cost function on line by using a particle swarm algorithm; comparing the optimal solution obtained by the particle swarm algorithm with an output voltage amplitude of a single branch H-bridge inverter circuit of the EAST fast control power supply to obtain an output voltage coefficient; multiplying the output voltage coefficient with a carrier amplitude to obtain a modulation value; comparing the modulation value with a carrier modulation to obtain an optimal duty cycle to control the single branch H-bridge inverter circuit of the EAST fast control power supply, so that the EAST fast control power supply output follows a given signal current value; and the application has the advantages of small calculation amount and high control precision.

This invention provides a method and system for assessing the severity of low voltage, relating to the field of low voltage data processing technology. The method includes the following steps: upon receiving a user's daily assessment instruction, obtaining the user's daily electricity usage duration and lowest voltage; determining whether the lowest voltage falls within a first low voltage threshold range; if the lowest voltage falls within the first low voltage threshold range, determining the user's daily low voltage coefficient using electricity usage duration, lowest voltage, duration weight, and voltage weight; if the lowest voltage does not fall within the first low voltage threshold range, the user's daily low voltage coefficient is 0. By combining voltage values ​​and electricity usage duration and introducing weights to reflect their different degrees of influence on the severity of low voltage, the actual impact of low voltage is reflected, improving the accuracy of reflecting the severity of low voltage.

The invention discloses a direct-current voltage proportion standard device calibration method based on quantum voltage, and discloses a device, a terminal and a medium with the method. According to the calibration method for the direct-current voltage proportion standard device based on the quantum voltage, accurate measurement of the high-voltage side voltage and the low-voltage side voltage of the direct-current voltage proportion standard device is achieved based on the quantum voltage precise measurement technology, and high-accuracy voltage proportion magnitude measurement is achieved; meanwhile, resistance temperature coefficients of the direct-current voltage proportion standard device at different voltages are monitored, resistance temperature control over the direct-current voltage proportion standard device is achieved through an incubator, and the voltage coefficient of the direct-current voltage proportion standard device is obtained by means of the relation between the voltage coefficient and the resistance temperature coefficient of the direct-current voltage proportion standard device. High-accuracy calibration of the direct-current voltage proportion standard device can be achieved under the low voltage, the proportion quantity value is directly traced to the quantum voltage standard, and a new method is provided for quantity value traceability of the direct-current voltage proportion standard device.

Method for determining current-dependent and / or rotation-angle-dependent parameters of an electrical machine (1) for implementation by means of an inverter (8), comprising the steps: a) Setting a rotational angle position of a rotor of the electric machine (1) and subsequently locking the rotor, b) Forming a longitudinal flow setpoint by adding a longitudinal flow setpoint operating point ( I d ,0 k ) and a longitudinal current setpoint alternating signal ( I d , HF k ) , where the longitudinal current setpoint alternating signal ( I d , HF k ) periodically changed with a longitudinal flow setpoint frequency, and / or forming a transverse flow setpoint by adding a transverse flow setpoint operating point ( I q ,0 k ) and a cross-current setpoint alternating signal ( I q , HF k ) , where the cross-flow setpoint alternating signal ( I q , HF k ) periodically changed with a cross-current setpoint frequency, c) Rules of a longitudinal flow (i d ) on the longitudinal flow setpoint and / or control of a transverse flow (i q ) to the cross-current setpoint, whereby control variables in the form of a longitudinal control voltage are used for regulation. (udk) and / or a transverse control voltage ( uqk ) generated and impressed into motor phases of the electric machine (1), and d) Measuring phase currents (i u,ist , i v,ist , i w,ist ) of the electric machine (1) and determining an emerging longitudinal current (i d, ist ) and / or an emerging crossflow (i q, ist ) from the measured phase currents (i u,ist , i v,ist , i w,ist ), characterized by the steps: e) Applying a discrete Fourier transform (DFT) algorithm or a Görtzel algorithm to the longitudinal control voltage (udk) and on the determined longitudinal flow (i d,ist ) to generate longitudinal control voltage coefficients and longitudinal current coefficients and / or to apply the DFT algorithm or the Görtzel algorithm to the transverse control voltage ( uqk ) and on the determined cross-flow (i q,ist ) for generating transverse control voltage coefficients and transverse current coefficients, and f) Calculating the parameters as a function of the longitudinal control voltage coefficients and the longitudinal current coefficients and / or the transverse control voltage coefficients and the transverse current coefficients, wherein the calculation of the parameters is carried out as a function of a dead time of the inverter (8) and / or as a function of signal propagation times of filters used to measure the phase currents.

The application discloses a kind of grid-connected point complex impedance determination method, device, electronic equipment and medium, it is related to grid-connected inverter system control technical field, first according to the target voltage coefficient matrix of phase-locked loop of the preset small signal model of inverter corresponding direct axis power grid information and phase-locked loop, second grid-connected voltage matrix and first grid-connected current matrix are determined based on the target current coefficient matrix of phase-locked loop corresponding to target voltage coefficient matrix and inductance, then according to target voltage coefficient matrix and target current coefficient matrix determine second grid-connected voltage matrix and second grid-connected current matrix, finally based on the complex impedance of the grid-connected point of inverter determined by first grid-connected voltage matrix, first grid-connected current matrix, second grid-connected voltage matrix and second grid-connected current matrix, the scheme introduces the direct axis power grid information corresponding to inverter, complements the missing phase information in preset small signal model, overcomes frequency coupling effect, accurately obtains the complex impedance of inverter grid-connected point.

The application relates to a high-load low-voltage coefficient reference circuit, which comprises a PNP transistor and an operational amplifier; the emitter of the PNP transistor and the non-inverting terminal of the operational amplifier are connected with a current source, the current source is connected with a reference voltage VDD, the non-inverting terminal of the operational amplifier is connected with the emitter of the PNP transistor, the inverting terminal of the operational amplifier is connected between a resistor R1 and a resistor R2 to form a negative feedback, the other end of the resistor R2 is connected with the ground, and the other end of the resistor R1 is connected with VOUT; the base and the collector of the PNP transistor are connected with the ground; and the output terminal of the operational amplifier is connected with VOUT. The reference circuit disclosed by the application sacrifices a slight temperature coefficient to realize significant optimization of area and power consumption.

The invention discloses a method and a device for predicting the reliability of a standby power supply with a super capacitor under an extreme environmental condition. The method comprises the following steps: placing a stand-by power supply in a non-discharge state in a preset extreme environment, starting timing and recording test temperature state parameters and test voltage state parameters after a preset time after the stand-by power supply reaches thermal stability and voltage stability; calculating the temperature coefficient of each component of the standby power supply in the extreme environment according to the test temperature state parameter and the reference temperature of each component of the standby power supply; calculating a voltage coefficient of each component of the standby power supply in an extreme environment according to the test voltage state parameter and the reference voltage of each component of the standby power supply; according to the temperature coefficient and the voltage coefficient of each component of the standby power supply and the reference failure rate of each component of the standby power supply, calculating the working failure rate of each component of the standby power supply in the extreme environment; and superposing the working failure rates of the components of the standby power supply in the extreme environment to obtain a reliability prediction result of the standby power supply.

The invention provides a parameter robustness optimization method for a permanent magnet synchronous motor in a flux weakening mode, which belongs to the technical field of motor control, and comprises the following steps: firstly, establishing an initial hyper-local model of the permanent magnet synchronous motor independent of motor parameters; then, identifying a voltage coefficient in the initial hyper-local model by using a model reference adaptive system, and then observing and estimating unknown disturbance in the initial hyper-local model by using a nonlinear extended state observer to obtain a final hyper-local model of the permanent magnet synchronous motor; and outputting an accurate reference voltage vector of the permanent magnet synchronous motor through the final hyper-local model, and finally realizing parameter robustness optimization. By improving a traditional deadbeat current prediction control method, current harmonics caused by parameter disturbance in a flux weakening mode can be suppressed, the accuracy of flux weakening control is ensured, parameter robustness optimization of a permanent magnet synchronous motor driving system is realized, and the method has great significance in realizing stable operation of the permanent magnet synchronous motor.

The invention provides a tunnel portal section bias voltage semi-quantitative evaluation method and device and a storage medium, and relates to the technical field of tunnel bias voltage calculation. The method comprises the following steps: calculating and determining bias coefficients of a plurality of tunnel portal sections; determining a plurality of bias levels based on the values of the plurality of bias coefficients; determining the influence of a plurality of bias voltage influence factors on the bias voltage coefficient under each bias voltage level based on numerical simulation, so as to determine one or more bias voltage influence factors with the maximum influence on the bias voltage coefficient as target influence factors; and obtaining one or more target influence factors of the target tunnel portal section, and generating a semi-quantitative evaluation result of the target tunnel portal section based on the target influence factors. According to the method, the core index of the bias voltage coefficient method is introduced, the complex mechanical behavior is converted into a quantifiable evaluation benchmark, and the evaluation efficiency of the bias voltage of the tunnel portal section can be greatly improved while certain precision is guaranteed.

The application provides a matrix-adjustable flexible power supply working state intelligent switching method, relates to the technical field of power conversion, and comprises the following steps: collecting power grid power supply voltage information and target device operation characteristic information; voltage fluctuation analysis is conducted to obtain a fluctuation amplitude; when the fluctuation amplitude reaches a fluctuation threshold value, stable voltage supply is conducted through an energy storage unit and an inverter unit; when the fluctuation threshold value is not reached, fluctuation operation influence analysis is conducted to obtain a first stable voltage coefficient; energy storage characteristic information is collected to conduct stable voltage analysis and obtain a second stable voltage coefficient; power supply voltage information is predicted to obtain a predicted fluctuation duration, target device energy consumption analysis is conducted, and a predicted stable voltage time is obtained; a third stable voltage coefficient is obtained, a comprehensive stable voltage coefficient is calculated, and it is judged whether a switch unit is closed or not. The application solves the technical problems that a traditional power supply system lacks intelligent coping strategies when facing power grid fluctuations, resulting in low energy utilization and poor device working stability.