Control method, electronic device and system for off-grid power supply equipment under nonlinear load

Abstract

Embodiments of the present invention disclose an off-grid power supply device control method, electronic device and system under nonlinear load. The method includes: acquiring an inductor current and calculating its absolute value; The comparison results determine the current current loop control state; adjust the current reference coefficient and control proportional coefficient of the current loop controller according to the current current loop control state; limit the current reference coefficient and control proportional coefficient. Subsequently, the current loop controller calculates according to the adjusted coefficient, outputs the PWM modulation signal, and finally outputs the target voltage. In the above manner, the embodiments of the present invention can effectively limit the current rising speed, avoid triggering the hardware protection to turn off the output, and also make the current change smoother, and the implementation cost of the method is low.

Description

technical field [0001] Embodiments of the present invention relate to the field of electronic technology, and in particular, to a control method, electronic device, and system for off-grid power supply equipment under nonlinear loads. Background technique [0002] With the development of new energy storage technology, more and more off-grid power supply equipment has appeared. In off-grid power supply equipment, energy storage inverters can be used as off-grid power supply applications for local loads, but in a large number of power electronic equipment, most of them are nonlinear loads, and linear loads are rarely used. The power electronic equipment with nonlinear load usually needs to use a rectifier circuit with a large capacitance to provide DC power for the subsequent circuit, and the rectifier circuit with a large capacitance has the characteristics of instantaneous large current and periodic nonlinearity. Equipment with motors, such as air-conditioning compressors a...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that the cost is high, and the power frequency transformer is bulky and heavy; the second is that when the inductor current of the inverter is overcurrent or changes greatly, the reference voltage in the control system is directly changed

This method has a certain effect, but it will cause the output voltage to change too much, not smooth, and the experience of some loads with high requirements is poor.

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