Inverter power supply current limiting control method of variable load current feedforward coefficient

Abstract

The invention discloses an inverter power supply current limiting control method of a variable load current feedforward coefficient. The inverter power supply current limiting control method comprises the following steps: (1) judging whether an inverter power supply is short-circuited or not; if so, entering step (4); otherwise, entering step (2); (2) judging whether a load current effective value is more than three times of rated load current or not; if so, entering step (5); otherwise, entering step (3); (3) judging whether the load current effective value is more than two times of the rated load current or not; if so, entering step (6); otherwise, entering step (7); (4) setting a feedforward coefficient to be 0 and finishing; (5) setting the feedforward coefficient to be 0 and entering step (8); (6) modifying the feedforward coefficient and entering step (8); (7) setting the feedforward coefficient to be 1 and entering step (8); (8) carrying out filtering processing on the feedforward coefficient. The method provided by the invention has the beneficial effect of improving output waveform quality of the inverter power supply under complicated conditions including an overload or short-circuit condition and the like.

Description

technical field [0001] The invention belongs to the technical field of inverter power supply control, and more specifically relates to a current-limiting control method of inverter power supply with variable load current feed-forward coefficient. Background technique [0002] There are many control methods for the existing inverter power supply, but most of them are aimed at the static performance and dynamic performance of the inverter output. There are few studies on improving the reliability of the inverter device, and the solution to the overload and short circuit of the inverter power supply. The quality of the output waveform under complex working conditions is of great significance for improving the reliability of the device. [0003] The existing technology adopts a double-loop control strategy for the inverter power supply. The outer-loop PR controller ensures the output waveform quality under no-load and load conditions, and the load current feed-forward ensures dy...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides an inverter power supply current limiting control method with variable load current feed-forward coefficient, the purpose of which is to solve the problem of overload or short circuit in the prior art double-loop control. Feedback leads to technical problems of poor output waveform quality

Images