Nr Electric Co., Ltd

Nr Engineering Co., Ltd

Weiming Pan

Taixun Fang

Xiang Zhang

Yongping Wang

Lei Liu

Fan Yang

Ming Yuan

Dongbin Lu

Zhenxi Wang

Guqing Zhou

Chen Zhou

Junsheng Wang

Shengfu Gao

Hua Huang

A thyristor valve test system based on cooperation of logic functions of software, wherein the test system comprises: a thyristor valve () to be tested, a VBE () and a tester (), and the VBE () has a dedicated test mode, the tester () provides three steps for each test item. The thyristor valve () to be tested and the VBE () are connected by optical fibers (), and the thyristor valve () to be tested and the tester () are connected by cables (), and there is no connection between the VBE () and the tester ().

Thyristor valve test system based on cooperation of logical functions of software

Within a predetermined time range, record time information of status indication signals fed back by thyristor control units (TCU) of a converter valve. Perform statistics and comparison of the pieces of time information using a bias statistics method. Mark a thyristor level whose bias exceeds a preset value. And determine a probability of failure in the thyristor according to the marking result.

Converter valve fault warning method and system

Provided are a commutation control method and a commutation control apparatus. The method includes: detecting whether transient disturbance in a DC transmission system satisfies a disturbance criterion condition; when the transient disturbance satisfies the disturbance criterion condition, determining a maximum trigger delay angle used in a commutation operation performed by a current converter on an inverter side of the DC transmission system, the determined maximum trigger delay angle being smaller than a maximum trigger delay angle used before the transient disturbance; and controlling the current converter on the inverter side of the DC transmission system to perform the commutation operation based on the determined maximum trigger delay angle.

Commutation control method and commutation control apparatus

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Jiangsu, China

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