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Title: Method and system for a gas tube-based current source high voltage direct current transmission system

Abstract

A high-voltage direct-current (HVDC) transmission system includes an alternating current (AC) electrical source and a power converter channel that includes an AC-DC converter electrically coupled to the electrical source and a DC-AC inverter electrically coupled to the AC-DC converter. The AC-DC converter and the DC-AC inverter each include a plurality of legs that includes at least one switching device. The power converter channel further includes a commutating circuit communicatively coupled to one or more switching devices. The commutating circuit is configured to "switch on" one of the switching devices during a first portion of a cycle of the H-bridge switching circuits and "switch off" the switching device during a second portion of the cycle of the first and second H-bridge switching circuits.

Inventors:
; ; ; ; ;
Publication Date:
Research Org.:
General Electric Company, Niskayuna, NY (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1377824
Patent Number(s):
9,748,857
Application Number:
14/824,657
Assignee:
General Electric Company ARPA-E
DOE Contract Number:
AR0000298
Resource Type:
Patent
Resource Relation:
Patent File Date: 2015 Aug 12
Country of Publication:
United States
Language:
English
Subject:
24 POWER TRANSMISSION AND DISTRIBUTION

Citation Formats

She, Xu, Chokhawala, Rahul Shantilal, Bray, James William, Sommerer, Timothy John, Zhou, Rui, and Zhang, Di. Method and system for a gas tube-based current source high voltage direct current transmission system. United States: N. p., 2017. Web.
She, Xu, Chokhawala, Rahul Shantilal, Bray, James William, Sommerer, Timothy John, Zhou, Rui, & Zhang, Di. Method and system for a gas tube-based current source high voltage direct current transmission system. United States.
She, Xu, Chokhawala, Rahul Shantilal, Bray, James William, Sommerer, Timothy John, Zhou, Rui, and Zhang, Di. 2017. "Method and system for a gas tube-based current source high voltage direct current transmission system". United States. doi:. https://www.osti.gov/servlets/purl/1377824.
@article{osti_1377824,
title = {Method and system for a gas tube-based current source high voltage direct current transmission system},
author = {She, Xu and Chokhawala, Rahul Shantilal and Bray, James William and Sommerer, Timothy John and Zhou, Rui and Zhang, Di},
abstractNote = {A high-voltage direct-current (HVDC) transmission system includes an alternating current (AC) electrical source and a power converter channel that includes an AC-DC converter electrically coupled to the electrical source and a DC-AC inverter electrically coupled to the AC-DC converter. The AC-DC converter and the DC-AC inverter each include a plurality of legs that includes at least one switching device. The power converter channel further includes a commutating circuit communicatively coupled to one or more switching devices. The commutating circuit is configured to "switch on" one of the switching devices during a first portion of a cycle of the H-bridge switching circuits and "switch off" the switching device during a second portion of the cycle of the first and second H-bridge switching circuits.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 8
}

Patent:

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  • A voltage source converter based high-voltage direct-current (HVDC) transmission system includes a voltage source converter (VSC)-based power converter channel. The VSC-based power converter channel includes an AC-DC converter and a DC-AC inverter electrically coupled to the AC-DC converter. The AC-DC converter and a DC-AC inverter include at least one gas tube switching device coupled in electrical anti-parallel with a respective gas tube diode. The VSC-based power converter channel includes a commutating circuit communicatively coupled to one or more of the at least one gas tube switching devices. The commutating circuit is configured to "switch on" a respective one of themore » one or more gas tube switching devices during a first portion of an operational cycle and "switch off" the respective one of the one or more gas tube switching devices during a second portion of the operational cycle.« less
  • A method and apparatus for controlling the real and reactive power behavior of a high voltage transmission (HDT) system is characterized by a rectifier station connected to a first three phase network and an inverter station connected to a second three phase network. The rectifier and inverter stations have positive and negative station-halves connected to each other over positive and negative dc transmission lines to form positive and negative poles, each station having a common ground or return wire. Each station is equipped with current and voltage regulators, as well as control angle and quenching angle regulators whereby in casemore » of the tripping of line protective devices monitoring line current in a faulty pole, and the consequent unloading of the faulty pole, the regulation of the intact pole assumes control for a short time to protect against network transients resulting from the load drop. In the event of a line disturbance, both the current set point for the current regulator and the control angle set point for the control angle regulator of the intact station-half of the intact pole are increased according to preset functions, with the control angle set point subordinated to the magnitude of the current angle set point.« less
  • A high-voltage dc transmission system and method is characterized by a minimum filtering requirement as to ripple as well as to surge and harmonics. Use of a superconducting generator directly coupled to rectifying means eliminates the requirement of a step-up transformer and allows operation at high frequency for minimizing ripple (and related filtering).
  • The objective of this project was to investigate how individual system parameters affect the operation and stability of a three terminal HVDC (high voltage direct current) power system. In order to obtain the desired information, system stability boundary lines were plotted in parameter space. Consideration was given to the various operating control modes that a three terminal system may attain. A simplified model was developed for the analysis. This model was of a general nature, allowing each converter to operate in any one of the three common modes of operation. Analysis of the model generated a tenth order characteristic equation.more » This equation was implemented in a digital computer program to obtain stability boundaries and relative stability plots in parameter space. At that point it was possible to study the system and how various parameters affect the dynamic behavior of the network. Some of the parameters investigated were length of transmission line, commutating reactance, converter control parameters and the DC series reactance. Studies were made for normal overhead transmission and underground cable transmission. Since the model developed is of a general nature, it is possible to simulate all of the common control modes.« less
  • This study to identify potentially attractive applications for gate-turnoff thyristor (GTO) converters in utility systems includes both high-voltage direct-current (HVDC) valves and static volt-ampere reactive (VAR) controllers. The work includes a broad review of basic principles and the power circuit arrangements that are judged to be most attractive. The major differences between ordinary thyristors and GTO converters are discussed, including alternative HVDC transmission systems and static VAR controllers that are possible with GTOs. Whereas a current-source type of converter is the obvious choice with ordinary thyristors, the use of GTOs allows either current-source or voltage-source converters to be considered. Amore » computer-aided analysis of the basic 6-pulse GTO current-source converter system is presented, including general equations for steady-state operation and plotting calculated waveforms. An analysis of a GTO voltage-source converter is given in less detail. Due to incomplete performance data, unresolved critical problems such as protection, and the disadvantages of higher cost, complexity and losses, it is difficult to recommend a specific GTO converter system at this time. The major advantage that GTO converters can offer is rapid and smoothly continuous control of reactive power. Further development of GTO converters should be aimed towards an application where reactive power control is very important and not readily achievable by conventional methods. 12 refs., 47 figs.« less