Series compensating electric power transmission system

Patent metadata

Field	Value
Publication number	US-2016276941-A1
Application number	US-201615074023-A
Country	US
Kind code	A1
Filing date	Mar 18, 2016
Priority date	Mar 19, 2015
Publication date	Sep 22, 2016
Grant date	—

Abstract

A series compensating electric power transmission system has an insulated type DC-DC converter that operates in the first through fourth quadrants, first and second DC voltage sources, and first and second power converters. In the converter, a first I/O positive terminal is connected to a first voltage source positive terminal. A first I/O negative terminal is connected to a first voltage source negative terminal. One of second I/O positive and negative terminals is connected to the first voltage source positive terminal. The other of the second I/O positive and negative terminals is connected to a second voltage source positive terminal. The first power converter converts power between the first I/O positive and negative terminals and first AC I/O terminals. The second power converter converts power between the second I/O positive and negative terminals and second AC I/O terminals. The second power converter is configured with a plurality of bidirectional switches.

First claim

What is claimed is:

1 . A series compensating electric power transmission system, comprising:
a first direct current voltage source that has a first voltage source positive terminal and a first voltage source negative terminal; a second direct current voltage source that has a second voltage source positive terminal and a second voltage source negative terminal; and a bidirectional DC-DC converter, the bidirectional DC-DC converter includes: a pair of first direct current input and output terminals configured with a first I/O positive terminal and a first I/O negative terminal, the first I/O positive terminal being connected to the first voltage source positive terminal, the first I/O negative terminal being connected to the first voltage source negative terminal; a pair of second direct current input and output terminals configured with a second I/O positive terminal and a second I/O negative terminal, one of the second I/O positive terminal and the second I/O negative terminal being connected to the first voltage source positive terminal, the other of the second I/O positive terminal and the second I/O negative terminal being connected to the second voltage source positive terminal; a first power converter having the pair of first direct current input and output terminals and a pair of first alternating current input and output terminals, the first power converter configured to bidirectionally perform power conversion between a first direct current voltage generated between the pair of first direct current input and output terminals and a first alternating current voltage generated between the pair of first alternating current input and output terminals; a second power converter having the pair of second direct current input and output terminals and a pair of second alternating current input and output terminals, the second power converter configured to bidirectionally perform power conversion between a second direct current voltage generated between the pair of second direct current input and output terminals and a second alternating current voltage generated between the pair of second alternating current input and output terminals; and an isolation transformer having a primary winding and a secondary winding, the primary winding being connected to the pair of first alternating current input and output terminals, the secondary winding being connected to the pair of second alternating current input and output terminals, wherein the first power converter has a plurality of switches, and the plurality of switches are connected to each other in one of push-pull, half bridge and full bridge configurations, the first power converter has a plurality of bidirectional switches, and the plurality of bidirectional switches are connected to each other in one of half bridge and full bridge configurations, and the plurality of switches and the plurality of bidirectional switches perform ON and OFF operations based on the first and second direct current voltages.

2 . The series compensating electric power transmission system according to claim 1 , wherein
each of the plurality of bidirectional switches is configured with two unidirectional switching elements and two diodes, the two unidirectional switching elements are connected in series in a state in which current flow directions of the two unidirectional switching elements are opposite to each other, the two diodes are connected in series in a state in which current flow directions of the two diodes are opposite to each other, and the two unidirectional switching elements and the two diodes are connected in parallel, respectively, in a reversed polarity state.

Assignees

• Tdk Corp

Inventors

• Iwaya Kazuki
• Miyazaki Toshimasa
• Shoji Kazu

Classifications

• H02J7/54 Primary

  Passive balancing, e.g. using resistors or parallel MOSFETs · CPC title

• H02M3/33546 Primary

  with automatic control of the output voltage or current (H02M3/33561 takes precedence) · CPC title

• H02M1/0093

  wherein the output is created by adding a regulated voltage to or subtracting it from an unregulated input · CPC title

• H02M3/3376

  with automatic control of output voltage or current · CPC title

• H02M3/33584 Primary

  Bidirectional converters · CPC title