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Three-port flexible multi-state switch device based on bridge arm multiplexing and hybrid cascading

A hybrid cascading, switching device technology, applied in output power conversion devices, AC networks of the same frequency with different sources, AC power input conversion to AC power output, etc., can solve problems affecting device efficiency and cost, etc. Achieve the effect of increasing reliability, avoiding DC bus voltage mismatch, and reducing manufacturing costs

Active Publication Date: 2020-11-24
ZHEJIANG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to achieve the best voltage utilization, the distribution lines of different voltage levels have different requirements for the DC bus voltage. The DC bus voltage determines the specification and quantity of the power switching devices used in the device, which affects the efficiency and cost of the device.

Method used

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  • Three-port flexible multi-state switch device based on bridge arm multiplexing and hybrid cascading
  • Three-port flexible multi-state switch device based on bridge arm multiplexing and hybrid cascading
  • Three-port flexible multi-state switch device based on bridge arm multiplexing and hybrid cascading

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Embodiment Construction

[0027] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] Such as figure 1 As shown, the present invention is based on the three-port flexible multi-state switch device topology of bridge arm multiplexing and hybrid cascading, which is composed of a single-port MMC using a hybrid cascading structure and a dual-port MMC based on bridge arm multiplexing, two parts connected via a common DC bus. in:

[0029] (1) A single-port MMC with hybrid cascading is used.

[0030] Hybrid cascade structure single-port MMC, the main power topology is a traditional six-arm MMC, and the AC output side is a cascaded H-bridge structure. Such as figure 1 As shown in the dotted box on the left, each bridge arm of the traditional six-arm MMC contains N H1 A half-bridge sub-module and a bridge arm reactor, a total of 6N H1 ...

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Abstract

The invention discloses a three-port flexible multi-state switch device based on bridge arm multiplexing and hybrid cascade, which is composed of a single port MMC of hybrid cascade structure and a dual port MMC based on bridge arm multiplexing, and is connected with each other through a common DC bus. Hybrid cascade structure single port MMC is composed of traditional six-leg MMC and cascade H-bridge. Bridge-arm multiplexing double-port MMC is a nine-leg MMC structure sharing the middle bridge arm. The hybrid cascade MMC is composed of six-leg MMC and cascade H-bridge. At that same AC side voltage level, the numb of sub-modules and the numb of bridge arm reactors used in the topology of the invention are greatly reduced compare with the traditional MMC, and the DC side short-circuit faultself-clearing capability and the DC voltage utilization ratio are higher. The invention is applicable to the interconnection of distribution lines of different voltage levels and different phase angles, and is helpful for flexibly controlling the active and reactive power flow of the system, improving the stability of the power supply and distribution system and improving the power quality.

Description

technical field [0001] The invention belongs to the technical field of flexible multi-state switches, and in particular relates to a three-port flexible multi-state switch device based on bridge arm multiplexing and hybrid cascading. Background technique [0002] The distribution network is at the end of the power system, directly facing the power users, and undertakes the important task of distributing electric energy and serving customers. At present, the continuous increase in the proportion of non-linear and impact loads in the distribution network, as well as the continuous increase in the penetration rate of new energy sources, have put forward higher requirements for the power quality and reliability of power supply in the distribution network. The existing distribution network is facing huge challenges in many aspects such as customization and diversification of electricity demand, large-scale access of distributed power generation, and complexity of power flow coord...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/06H02M5/458
CPCH02J3/06H02M5/4585
Inventor 邓焰王昆金林周乐园杨勇陆翌王朝亮许烽
Owner ZHEJIANG UNIV
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