A Multilevel Voltage Equalizing DC-DC Converter Based on Suspension Module

Abstract

The present invention is a multi-voltage equalizing DC-DC converter based on a suspension module, which is composed of m suspension modules, and the m suspension modules are respectively: SM 1 ,SM 2 ,...,SM j‑1 ,SM j ,SM j+1 ,...,SM m , m is an integer ≥ 2, each suspension module is composed of a capacitor unit CU and a voltage equalization unit VBU; the suspension module SM x Lead out P x1 ,P x2 ,P x3 and P x4 Four terminals, P x1 ,P x2 form the input port, P x3 ,P x4 Constitute an output port, where x=1,2,...,m; the input ports of m suspension modules are connected in series, connected to the input side or output side, and the output ports of m suspension modules are connected in parallel, connected to the output side or input side . In the converter, after the output ports of m suspension modules are connected in parallel, they can be connected in parallel to the input port of a certain suspension module. At this time, the suspension module removes the voltage equalization unit VBU and only leads out to the input port.

Description

A Multi-Voltage Average Voltage DC-DC Converter Based on Suspension Module technical field The present invention relates to the technical field of multi-level direct current conversion, specifically a kind of multi-level average voltage based on suspension module type DC‑DC converter. Background technique [0002] China has a vast territory. In order to solve the problem of unbalanced energy distribution, a long-distance high-power DC transmission and distribution network is constructed. It is imperative, which further promotes the research of medium and high voltage high power DC‑DC converters. Traditional high-capacity DC‑DC converters such as Diode-clamped converters, double-sided active bridge (DAB) converters, etc., when applied to the interconnection of high-voltage DC power grids, are The voltage and current stress requirements of the system usually require a large number of devices in series and parallel. The flow problem limits the application of traditiona...

AI Technical Summary

Problems solved by technology

However, when a module composed of a supporting capacitor and a voltage equalizing circuit fails, it is very easy to cause a short-circuit discharge accident of the supporting capacitor; because it does not have the ability to remove the faulty module, the fault spreads from the faulty module to the normal module, thereby affecting the entire transformation. the normal operation of the device, and even cause serious safety accidents

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