A control method for dcm single-bridge integrated split-source boost inverter

Abstract

The invention relates to a control method of a DCM single bridge arm integrated split source boost inverter, the control method is applied to an independent inverter occasion under the output voltage stabilization mode, including: obtaining the DC bus voltage and comparing it with the DC bus voltage reference Make a comparison, and realize the DC side boost control through the DC bus voltage PI controller; obtain the output voltage, compare the output voltage with the output AC reference, and realize the sinusoidalization and amplitude control of the output waveform through the output voltage PI controller. Through this method, the DCM single-bridge integrated split source boost inverter can be applied to the independent inverter occasion in the output voltage stabilization mode, and can effectively avoid the output waveform over-modulation phenomenon during light-load operation, and improve the output waveform quality. In addition, an input inductance design method is provided, which can ensure that the system always works in the inductive current discontinuous mode in the entire operating range, so that the provided control method can be implemented smoothly.

Description

technical field [0001] The present invention relates to the field of electrical technology, in particular to a control method for a DCM single-bridge integrated split source boost inverter, and in particular to a DCM single-bridge applied to an independent inverter in an output voltage stabilization mode A control method for an integrated split-source boost inverter. Background technique [0002] The two-stage single-phase boost inverter is widely used in occasions where the input voltage is low and has a large variation range. Its control is relatively simple, but the number of power devices is large, the cost is high, and the overall efficiency is difficult to further improve. In recent years, some scholars have proposed a single-arm integrated split-source inverter, which realizes the front-stage DC-DC boost converter (such as Boost, Buck- Boost, etc.) and a bridge arm of the rear-stage single-phase voltage source inverter, which not only realizes the boost inverter, but...

AI Technical Summary

Problems solved by technology

This control method avoids the problem of over-modulation of the output waveform at light load, but it needs to use the output power as the control degree of freedom, so it is not suitable for the application of independent inverter (the load power is constant in the output voltage regulation mode)

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