Abstract
The converter valve is the core equipment in the HVDC power transmission system, a+-nd its performance has a direct effect on the reliability, stability and efficiency of the whole power system. As the basic unit of HVDC converter valve, the thyristor level needs to be test routinely in order to grasp the state of the converter valve equipment. Therefore, it is urgent to develop a novel synthetic test system for the thyristor level with thyristor control unit (TCU). However, currently there is no specific test scheme for the thyristor level of HVDC converter valve. In this paper, the synthetic test principle, content and methods for the thyristor level with TCU are presented based on the analysis of the thyristor reverse recovery characteristic and the IEC technology standard. And a transient high-voltage pulse is applied to the thyristor level during its reverse recovery period in order to test the characteristics of thyristor level. Then, the synthetic test system for the thyristor level is applied to the converter valve test of ±800 kV HVDC power transmission project, and the practical test result verifies the reasonability and validity of the proposed synthetic test system.
Highlights
As the core element of HVDC converter valve, thyristor is massively adopted to transmit electric power energy because of its high power capacity
As to electrical test of HVDC converter valve, IEC 60700-1-2008 and GB/T20992-2007 technology standard provide some relevant provisions [1, 2]. These provisions mainly focus on the type test, such as dielectric test and operation test
Based on the analysis of the electrical principle and failure mode of thyristor level unit, this paper proposed a synthetic test scheme for in-situ routine test, and the synthetic test system is applied to the converter valve test of a practical ±800 kV HVDC power project
Summary
As the core element of HVDC converter valve, thyristor is massively adopted to transmit electric power energy because of its high power capacity. As to electrical test of HVDC converter valve, IEC 60700-1-2008 and GB/T20992-2007 technology standard provide some relevant provisions [1, 2]. These provisions mainly focus on the type test, such as dielectric test and operation test. It is necessary to establish a routine synthetic test system for thyristor level, which can ensure the performance of thyristor level and provide technical support for the operation and maintenance of HVDC converter valve. Based on the analysis of the electrical principle and failure mode of thyristor level unit, this paper proposed a synthetic test scheme for in-situ routine test, and the synthetic test system is applied to the converter valve test of a practical ±800 kV HVDC power project
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