Thyristor based voltage source converter

一种电压源转换器、晶闸管的技术，应用在输出功率的转换装置、电气元件、不可逆的直流功率输入变换为交流功率输出的等方向，能够解决控制缓慢、频繁故障、不能提高AC电网稳定性等问题，达到减少阀成本、损耗减少的效果

Active Publication Date: 2015-09-09
HITACHI ENERGY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, LCC converters have several disadvantages: they may experience commutation faults, they require a strong alternating current (AC) grid, they do not support reactive power, have high harmonics, require polarity reversal for power reversal, Leaves large footprint, slow control and does not improve AC grid stability
[0005] However, VSC converters have the following disadvantages: higher on-state losses, higher switching losses, increased rating (due to fault current), frequent faults and higher cost

Method used

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  • Thyristor based voltage source converter
  • Thyristor based voltage source converter
  • Thyristor based voltage source converter

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Embodiment Construction

[0024] Hereinafter, a specific description will be given of preferred embodiments of the present invention.

[0025] figure 1 A converter 10 according to a first embodiment of the invention is shown. It consists of a three-phase bridge consisting of multiple phase arms. In this case there are three phase arms. There are a first phase arm, a second phase arm and a third phase arm. The phase leg is more specifically connected between first and second direct current (DC) poles P1 and P2, wherein the first pole P1 provides a first voltage +V DC And the second pole P2 provides the second voltage -V DC . The midpoints of the phase arms are each connected to a corresponding AC terminal TA, TB, TC. Here the midpoint is connected via a corresponding reactor Xr to the alternating current (AC) terminals TA, TB and TC, and the AC terminals are in turn connected to the windings of the transformer TR, which in this case are delta connected as an example.

[0026] The phase legs consi...

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Abstract

The invention concerns a voltage source converter (10) comprising a number of valves (V1, V2, V3, V4, V5, V6), the valves comprising switching elements with anti-parallel diodes provided in a bridge for switching between two states, where the bridge is provided in at least one phase leg that stretches between two direct current poles (P1, P2) and has at least one midpoint, which is connected to an alternating current terminal (TA, TB, TC), wherein the switching element of at least one valve is a thyristor, and the converter further comprises a commutation cell (CCA, CCB, CCC) associated with the valve, where the commutation cell is controllable to reverse-bias the valve if it is to stop conducting current.

Description

technical field [0001] The present invention generally relates to voltage source converters. More specifically, the present invention relates to a voltage source converter and a method of controlling the same. Background technique [0002] High voltage direct current (HVDC) converters are largely classified into current source converters (CSCs) and voltage source converters (VSCs). CSC converters are based on line-commutated converters (LCCs) containing thyristors. Thyristors have some inherent advantages such as being robust, having low on-state losses, being easily connected in series with each other, being capable of short-term over-rating, and having high power ratings and low cost. In addition, thyristors are well developed and commonly used components. However, LCC converters have several disadvantages: they may experience commutation faults, they require a strong alternating current (AC) grid, they do not support reactive power, have high harmonics, require polarit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/487H02M7/48H02M7/483
CPCH02M2007/4811H02M7/487H02M2007/4835H02M7/4811H02M7/4835H02M1/0095H02M5/443
Inventor P·K·巴鲁帕蒂T·琼森S·萨布拉玛尼安
Owner HITACHI ENERGY LTD
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