Method for controlling power balance of DC side of cascaded multilevel inverter

Abstract

The invention discloses a method for controlling the power balance of the DC side of a cascaded multilevel inverter. The power control of the cascaded multilevel inverter is divided into two layers, an upper layer control and a lower layer control,wherein, the upper layer control realizes the total power control, and the lower layer control carries out the operation of active power redistribution on each full-bridge conversion unit by overlapping a pure active power vector which is parallel to the current direction on the basis of the upper layer control, thereby enabling the input power on the DC side of each full-bridge conversion unit of the cascaded multilevel inverter to tend to be balanced. The invention does not need to be provided with an extra power circuit, and can effectively realize the power balance of the DC side of the inverter, thereby reducing the cost fo the system and improving the reliability of the system.

Description

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AI Technical Summary

Benefits of technology

This technology uses an Active Vector (AV) system with two levels - one level called Pure Actor Controller(PAC), which controls the flow of electricity through multiple conductors connected together by wires. By controlling both the AC voltages applied across these conductive elements, it allows for precise adjustment over time. Overall this technology provides better performance than existing methods due to no extra costly components needed but also simplifies circuitry designs compared to older systems.

Problems solved by technology

Technological Problem: Current method for controlling the amount of current supplied by different levels of a circuit involves adding extra components or devices that can make up differences between certain parts of the circuit's performance due to manufacturing variations during production processes. These techniques may result in increased complexity, reduced efficiency, poor durability, potential damage from overcurrent faults, etc., which could limit their use in various fields like renewable energies (Energy) and advanced transportation systems (Advanced Transport System).

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