Voltage source converter and associated method

A technology of voltage source converters and converters, which is applied in the direction of output power conversion devices, electrical components, and conversion of AC power input to DC power output, and can solve problems such as slow control, high on-state loss, and high switching loss
CN107078656AInactive Publication Date: 2017-08-18ABB (SCHWEIZ) AG
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ABB (SCHWEIZ) AG
Publication Date
2017-08-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

It is presented a voltage source converter comprising a first converter device. The first converter device comprises: a plurality of director valves, wherein each director valve comprises two anti-parallel thyristors provided in a bridge for switching between two states, the bridge being provided in at least one phase leg connected to two a first pair of direct current poles and comprising a midpoint connected to an alternating current, AC, terminal; and at least one commutation cell connected to a respective one of the at least one phase leg, wherein the commutation cell is controllable to reverse-bias a thyristor of at least one director valve of a connected phase leg when the thyristor is to stop conducting current. By providing anti-parallel thyristors in the director valves, greater control is possible. For instance the current between the DC poles can be turned off using the director valves.
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Description

technical field

[0001] The present invention relates to voltage source converters and associated methods. Background technique

[0002] A high voltage direct current (HVDC) converter is mainly classified into a current source converter (CSC) and a voltage source converter (VSC). CSC converters are based on line-commutated converters (LCCs) containing thyristors. Thyristors have some inherent advantages such as being rugged, having low on-state losses, being easy to connect in series with each other, having a short time overrating capability and having high power rating and low cost. Also, thyristors are well established and commonly used components. However, LCC converters have several disadvantages: they can suffer from commutation failures, they require a strong alternating current (AC) grid, they do not support reactive power, have high harmonics, require polarity inversion for power inversion turn, leaving a large coverage area, the control is slow and does not improv...

Claims

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