Current source for function test of DC high-voltage transmission thyristor converter valve component

Abstract

The invention discloses a current source for a function test of a DC high-voltage transmission thyristor converter valve component. The current source mainly comprises a three-phase three-winding rectifier transformer T1 and a six-pulse rectifier bridge, wherein the three-phase three-winding rectifier transformer T1 transforms the high voltage and low current of a power supply system to the low voltage and large current on a valve side; the six-pulse rectifier bridge transforms the AC to large DC and provides the test current for a converter valve component sample through a DC bus; the six-pulse rectifier bridge is only one set, and the DC output current of the six-pulse rectifier bridge can reach 7,000 A. The current source can test more samples at lower voltage on the valve side of the transformer and can greatly reduce the secondary side voltage of a converter transformer under the condition that the test requirements are met so as to greatly reduce the capacity of the rectifier transformer in the current source loop.

Description

technical field [0001] The invention relates to the electrical test field of high-voltage direct current transmission thyristor converter valve components, in particular to a current source for functional testing of high-voltage direct current transmission thyristor converter valve components. Background technique [0002] The high-power thyristor converter valve is one of the core equipment of the converter station of the HVDC power transmission project. Its cost generally accounts for about 20% of the total investment of the converter station equipment of the HVDC power transmission project, and its quality directly affects the reliability of the HVDC power transmission system. . As the construction scale of high-voltage or ultra-high voltage direct current transmission projects continues to increase and the transmission capacity continues to increase, it is necessary to continuously develop thyristor converter valves with higher voltage and current levels to meet the need...

AI Technical Summary

Problems solved by technology

At present, the current source used in the test generally uses the back-to-back direct test method, the valve side voltage of the current source converter transformer is high, and the capacity requirement is high; or two 6-pulse rectified currents are connected in parallel, and the operation is performed in a zero-power mode, and the structure is complicated.

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