Multi-port power electronic converter for energy internet

Abstract

The invention relates to a multi-port power electronic convert for energy internet, and belongs to the technical field of power electronic converters. According to the invention, the converter is composed of one static synchronous series compensator, one static synchronous compensator, one DC-DC converter and one three-phase DC-AC inverter. The static synchronous series compensator and the static synchronous compensator are both formed on the basis of a modular multi-level converter. The DC-DC converter is formed by a plurality of isolated DC-DC converters which are subject to input series and output series, and shares a high-voltage DC bus with the static synchronous series compensator and the static synchronous compensator. According to the invention, the converter integrates the functions of a unified power flow controller and the functions of a power electronic transformer, thus having complementary advantages of the unified power flow controller and the power electronic transformer and reducing cost; the converter is modularized, is easy to expand and set with a backup, and has important application potential in future energy internet.

Description

technical field [0001] The invention relates to a multi-port power electronic converter for energy Internet, belonging to the technical field of power electronic converters. Background technique [0002] With the gradual increase of grid-connected distributed energy sources such as solar energy and wind energy, many challenges have been raised to the stability and economy of traditional power grids. To meet the challenges, scholars have proposed the concept of building an energy Internet to achieve more reasonable and intelligent control of the power flow, enable more flexible access to distributed energy, and improve the economy and stability of the power grid. [0003] In traditional power grids, some flexible power transmission system (hereinafter referred to as FACTS) devices can already realize flexible control of AC power transmission. For example, the static synchronous compensator can control reactive power and voltage, the static synchronous series compensator can ...

AI Technical Summary

Problems solved by technology

However, the existing topology mainly solves the problems of distributed energy access and multi-port power conversion, and still lacks the ability to flexibly control the power flow and voltage of the traditional AC grid at the same time

If conventional FACTS devices are used with multi-port power electronic converters, the total cost of both is higher

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