Eliminate commutation failures in lcc HVDC systems

An L-C, commutation converter technology, applied in the output power conversion device, the conversion of AC power input to DC power output, electrical components and other directions, can solve the problems of low cost and reliability, limit rated power, etc., to reduce equipment. Low cost and low power consumption

Active Publication Date: 2019-12-17
THE UNIV OF BIRMINGHAM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hardware used to achieve these advantages limits factors such as power rating, power dissipation, low cost, and reliability

Method used

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  • Eliminate commutation failures in lcc HVDC systems
  • Eliminate commutation failures in lcc HVDC systems
  • Eliminate commutation failures in lcc HVDC systems

Examples

Experimental program
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Embodiment Construction

[0082] For generalization, as in Figure 6b As shown, the controllable capacitor branch can contain N hybrid SMC modules:

[0083] · Half-bridge modules based on M1 IGBT, such as Figure 7a shown

[0084] · M2 IGBT based full bridge modules such as Figure 7b shown

[0085] · N1 thyristor-based half-bridge modules with diodes, such as Figure 8a shown

[0086] L1 thyristor-based half-bridge modules without diodes, such as Figure 8b shown

[0087] · N2 thyristor-based full-bridge modules with diodes, such as Figure 8c shown

[0088] L2 thyristor-based full-bridge modules without diodes, such as Figure 8d shown

[0089] where M1 , M2 , N1 , N2 , L1 , L2 are non-negative integers (ie they may include zero), and total N=M1+M2+N1+N2+L1+L2>=1. For these hybrid modules of the controllable capacitor branch, the SMC can be applied by the "pull", "push" or "push-pull" method detailed below. Hereinafter, the term "hybrid capacitor module" refers to a plurality of N hybrid ...

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Abstract

A line commutated converter (LCC) for a high voltage direct current power converter, the LCC comprising at least one LCC bridge circuit for connection to at least one terminal of a DC system, each bridge circuit comprising a plurality of arms, Each arm is associated with a respective phase of the AC system, each arm comprising: one or more upper thyristor valves and one or more lower thyristor valves connected in series; an associated branch extending from between the upper and lower thyristors; and at least one thyristor-based capacitor module for each phase, each module comprising a plurality of module thyristors, each capacitor module operable to insert a main capacitor into the bridge by triggering at least one or more of said module thyristors in the corresponding arm of the circuit.

Description

technical field [0001] The present invention relates to power converters, and more particularly to line commutated converters (LCCs) for use in high voltage direct current (HVDC) systems and the cancellation of commutation failures and control of reactive power / AC voltage therein. Background technique [0002] In high voltage direct current (HVDC) power transmission systems, direct current (DC) is used for large-scale transmission of power. Since power losses in DC power transmission systems are lower than those in corresponding AC power transmission systems, DC is generally preferred for power transmission over long distances. Of all commonly used HVDC technologies, LCC-HVDC has the lowest losses due to the use of thyristors. In addition, long-distance DC transmission lines are less expensive. This is because the DC transmission system does not need to support three phases and has no skin effect, so DC requires a smaller conductor area than AC. Furthermore, LCC-HVDC has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/515H02M7/757H02M7/483
CPCH02M7/5152H02M7/5155H02M7/7575Y02E60/60H02M7/4835H02M1/0095H02M7/05H02M7/519H02M7/521
Inventor 张小平雪映
Owner THE UNIV OF BIRMINGHAM
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