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1. (WO2015123922) CURRENT CONVERTER MODULE UNIT, CURRENT CONVERTER, DIRECT-CURRENT TRANSMISSION SYSTEM AND CONTROL METHOD

Pub. No.:    WO/2015/123922    International Application No.:    PCT/CN2014/076926
Publication Date: Fri Aug 28 01:59:59 CEST 2015 International Filing Date: Thu May 08 01:59:59 CEST 2014
IPC: H02J 1/00
Applicants: NR ELECTRIC CO., LTD
南京南瑞继保电气有限公司
NR ENGINEERING CO., LTD
南京南瑞继保工程技术有限公司
Inventors: XIE, Yeyuan
谢晔源
CAO, Dongming
曹冬明
SHAO, Zhenxia
邵震霞
DONG, Yunlong
董云龙
Title: CURRENT CONVERTER MODULE UNIT, CURRENT CONVERTER, DIRECT-CURRENT TRANSMISSION SYSTEM AND CONTROL METHOD
Abstract:
A current converter module unit, a converter, a direct-current transmission system and a control method. In the converter module unit, the positive electrode of a first switch module (T1, D1) is connected to the positive electrode of a first energy storage element (C1), and the negative electrode of a second switch module (T2, D2) is connected to the negative electrode of the first energy storage element; the negative electrode of a diode (D6) is connected to the positive electrode of the first switch module, the positive electrode of the diode is respectively connected to the negative electrode of a second energy storage element (C2) and the negative electrode of a fourth switch module (T4, D4), the positive electrode of the fourth switch module is connected to the negative electrode of a third switch module (T3, D3), and the positive electrode of the second energy storage element is connected to the positive electrode of the third switch module; and the positive electrode of the third switch module is connected to the positive electrode of a fifth switch module (T5, D5), and the negative electrode of the fifth switch module is connected to the negative electrode of the second switch module. This structure can provide a favourable direct-current side fault ride-through performance, thereby overcoming the limitation and deficiency of structures such as a full-bridge module and a clamping double-module, and having better economical and technological performances.