The integration of offshore wind farms has revitalized the interest in multi–terminal high voltage direct current (M–HVdc) transmission grids. HVdc breakers’ importance increased as M–HVdc grids are now a commercial truth. Several circuit breaker technologies have been developed, published, and appeared prototypes for networks. This paper summarizes from last two decades, distributed mainly lit...

High voltage direct current (HVDC) systems are now well integrated into AC in many jurisdictions. The integration of renewable energy sources (RESs) is a major focus and the role HVDC expanding. However, protection against DC faults challenging issue that can have negative impacts on reliable safe operation power systems. Practical solutions to protect grids without widespread outage include: 1...

Circuit Breakers (CBs) are critical components in power system for reliability and protection. To assure their accurate performance, a comprehensive condition assessment is of an imminent importance. Based on dynamic resistance measurement (DRM), this paper discusses a simple yet effective fuzzy approach for evaluating CB’s electrical contacts condition. According to 300 test results obta...

in this paper, power system restoration in the presence of svc and tcsc in partial outage conditions is considered and a new method for maximum load restoration using different control variables is presented. control variables are tap of transformers, generation rescheduling and operating points of facts devices. objective function is restored load (to be maximized) and constraints are voltage ...

Voltage Source Converter-High Voltage Direct Current (VSC-HVDC) is the most efficient and reliable method for electrical power transmission over long distances. The greatest challenge with VSC-HVDC system is that short-circuit faults damages the converter valves and the transmission network. The fault clearing time for the available DC breakers are not fast enough and reliable to provide adequa...

The breaking capacity of rated current is one the important indexes to evaluate performance circuit breakers, which usually measured experimentally and cannot be analyzed in terms arcing characteristics opening process. Simulation methods based on magnetohydrodynamic (MHD) model arc can used obtain macroscopic motion within interrupter interaction with contacts, walls, splitter plates. Therefor...