Boost to the max Controlling a Diode-assisted Buck-boost Voltage Source Inverter with the Fewest Number of Diodes

by Engineer's Planet

In order to achieve high voltage gain, voltage source inverter diodes support buck-boost by incorporating a switch-capacitor-based high step-up dc-dc circuit between the source and the inverter bridge. Alternative pulse width modulation (PWM) techniques are developed for the special construction using the chopped intermediate dc-link voltage. This study offers a ground-breaking PWM technique to maximize voltage gain and boost effectiveness. It regulates the front boost circuit to make sure that the maximum three-phase line voltage at any given time is equal to the average dc-link voltage over the course of one switching time period (T s). As a result, the equivalent switching frequency of the inverter bridge for power devices can be reduced to 1/f s. The design of the closed-loop controller and its operating principle is examined and verified using simulations and tests. Compared to traditional PWM strategies, the novel control method is more effective in high-voltage gain situations and requires less power from the device. This topology, which is more economical, is advantageous for wide-range dc/ac voltage regulation in renewable energy applications. The capacitor voltage and inductor current exhibit six times more line-frequency ripples as a result of the new control method. It is also perfect for 400-800 Hz, medium-frequency marine, and aviation power supply systems.

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