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MMC (modular multiple converter) type multi-port power electronic transformer applied to alternating current/direct current hybrid power distribution network

An AC-DC hybrid and power electronics technology, applied to AC networks with the same frequency from different sources, electrical components, etc., can solve problems such as the inability to apply medium and high voltage distribution networks, and achieve light weight, improved power flow control, and reduced The effect of project cost

Inactive Publication Date: 2016-06-15
SOUTHEAST UNIV
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Problems solved by technology

Chinese patent CN200920247154.5 discloses a modular power electronic transformer, the transformer has more than two ports power electronic transformer, only one high-voltage DC port and one AC port, which cannot be applied to medium and high voltage distribution networks

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  • MMC (modular multiple converter) type multi-port power electronic transformer applied to alternating current/direct current hybrid power distribution network
  • MMC (modular multiple converter) type multi-port power electronic transformer applied to alternating current/direct current hybrid power distribution network

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the accompanying drawings.

[0016] like figure 1 Shown is a typical MMC type multi-port power electronic transformer used in AC-DC hybrid distribution network, including input stage, intermediate stage and output stage, with four types of universal interfaces: high-voltage AC, high-voltage DC, low-voltage AC and low-voltage DC . The specific structure of the circuit is:

[0017] The input stage includes a high-voltage AC port and a high-voltage DC port. The high-voltage AC port is connected to the medium and high-voltage distribution network, and the high-voltage DC bus is connected to the high-voltage DC port. The topology of the input stage is a three-phase structure, and each phase is divided into two upper and lower bridge arms. A bridge arm inductor and several MMC power units are connected in series on each bridge arm. The AC contacts of the upper and lower bridge arms belonging to the sa...

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Abstract

The invention discloses an MMC (modular multiple converter) type multi-port power electronic transformer applied to an alternating current / direct current hybrid power distribution network. The multi-port power electronic transformer comprises an input level, a middle level and an output level, and are equipped with four kinds of universal interfaces: a high-voltage alternating current interface, a high-voltage direct current interface, a low-voltage alternating current interface and a low-voltage direct current interface; the input level refers to the MMC; the middle level refers to an isolating dual active full-bridge DC / DC converter; and the output level refers to a three-phase four-wire-system full-bridge inverter. Except the basic functions of voltage transformation, isolation, energy transfer and the like as a common transformer, the transformer provided by the invention can realize access of voltages of various forms with the multiple working modes, can perform functions of power flow control, electric quality adjustment and the like; and therefore, an intelligent power distribution network interface with higher applicability is configured.

Description

technical field [0001] The invention relates to an MMC (modular multiple converter, modular multi-level changer) type multi-port power electronic transformer applied to an AC-DC hybrid distribution network, which belongs to the application technology of power electronics in power systems. Background technique [0002] Adjusting the energy structure is a long-term strategic task for the development of my country's electric power industry. The National Thirteenth Five-Year Plan pointed out that based on my country's national conditions and economic development stage, the development of smart grid should be vigorously promoted, and the scale of clean energy power generation and consumption market should be expanded. The large-scale use of renewable energy has prompted the DC power distribution system, which is more conducive to distributed power access, to receive extensive attention from the academic community. In addition, the DC distribution network has the following advant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J5/00H02J3/06
CPCH02J5/00H02J3/06
Inventor 赵剑锋陈璐瑶孙毅超
Owner SOUTHEAST UNIV
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