BS EN 62751-2:2014

This standard BS EN 62751-2:2014 Power losses in voltage sourced converter (VSC) valves for high-voltage direct current (HVDC) systems is classified in these ICS categories:

• 29.240.99 Other equipment related to power transmission and distribution networks
• 29.240.01 Power transmission and distribution networks in general
• 29.200 Rectifiers. Converters. Stabilized power supply

IEC 62751-2:2014 gives the detailed method to be adopted for calculating the power losses in the valves for an HVDC system based on the "modular multi-level converter", where each valve in the converter consists of a number of self-contained, two-terminal controllable voltage sources connected in series. It is applicable both for the cases where each modular cell uses only a single turn-off semiconductor device in each switch position, and the case where each switch position consists of a number of turn-off semiconductor devices in series (topology also referred to as "cascaded two-level converter"). The main formulae are given for the two-level "half-bridge" configuration but guidance is also given as to how to extend the results to certain other types of MMC building block configuration.