6 results about "Voltage coefficient" patented technology

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 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 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.