Electric Power Research Institute, China Southern Power Grid

China Southern Power Grid

China Southern Power Grid Technology Research Institute Co., Ltd.

Chuang Fu

Hong Rao

Shukai Xu

Juanjuan Wang

Xiaolin Li

Huan Li

Zhaoxin Wen

Ruina Zheng

A method, an apparatus and a device for suppressing a first HVDC commutation failure under an AC system fault are provided. The method includes: obtaining a three-phase voltage of a converter bus, and calculating a zero-sequence component amplitude and an αβ component amplitude; calculating a first trigger-angle command for a single-phase fault and a second trigger-angle command for a three-phase fault; selecting a smaller one of the first trigger angle command and the second trigger angle command as a trigger-angle command for an extinction-angle controller; and adjusting a trigger angle of the HVDC transmission system by using the trigger-angle command as an upper limit value for an output of the extinction-angle controller of the HVDC transmission system.

Control method and apparatus for high-voltage, direct current first commutation failure in alternating-current fault

A voltage source converter based DC deicer and its control method are provided. The voltage source converter based DC deicer includes a connecting reactor, a modular multilevel voltage source converter based on a full H-bridge submodule, smoothing reactors, deicing disconnectors, a deicing bus, and a deicing AC line. The AC side of the modular multilevel voltage source converter is connected to an AC side bus through the connecting reactor, an isolation disconnector and a breaker. The DC side of the modular multilevel voltage source converter is connected to the deicing AC line through the smoothing reactors, the deicing disconnectors, and the deicing bus.

Voltage source converter based direct current deicer and controlling method thereof

A multi-functional automatic switching circuit for direct current ice melting and a switching method thereof are provided. The automatic switching circuit comprises at least one sub-switching circuit. The sub-switching circuit comprises a six-pulse current converter (R) with no saturable reactor, six reactors (L, L, L, L, L, and L), three three-phase knife switches (Sac, Sac, and Sac), and five single-phase knife switches (SV, SV, SV, SV, and SV). The sub-switching circuits in series connection or parallel connection, four direct current side switching knife switches (Sdc, Sdc, Sdc, and Sdc), an isolation knife switch (K), a breaker (QF) and a control and protection system (CP) may form an automatic switching circuit for six-pulse or twelve-pulse direct current ice melting. The automatic switching circuit with no saturable reactor reduces noise during operation, achieves mutually automatic switching among modes of reactor switching, ice melting and test, and may complete the through-flow test of the automatic switching circuit without switching in a power transmission line, thereby solving the problem of daily operation and maintenance.

Multi-functional direct current ice melting automatic switching circuit and switching method thereof

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Guangdong, China

Chuang Fu