GB/T 20996.3-2020 Performance of high-voltage direct current (HVDC) systems with line-commutated converters—Part 3:Dynamic conditions

Scope

This part of GB/T 20996 provides comprehensive guidelines for the dynamic performance of high-voltage direct current (HVDC) systems. In this part, dynamic performance refers to events and phenomena covering the range from transient conditions to steady-state conditions in the frequency or time domain. The dynamic performance involved should pertain to the mutual influence between the HVDC system at both ends and the connected AC system or its components, such as power plants, AC lines, and buses, reactive power sources, etc., under steady-state or transient conditions. It is assumed that the HVDC system at both ends consists of a 12-pulse converter unit composed of a three-phase bridge circuit (two paths), which has bidirectional power transmission capability. The converter uses thyristor valves insulated with gapless metal oxide arresters in the bridge arms. This part does not consider diode converter valves. Although multi-terminal HVDC transmission systems are not specifically mentioned, many of the contents in this part are also applicable to multi-terminal systems.
This part only deals with grid-side converters, including converters with capacitor phase-shifting circuit structures. IEC 60146-1-1, IEC TR 60146-1-2, and IEC 60146-1-31 provide general requirements for grid-side semiconductor converters, excluding voltage-source converters.

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