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Overcurrent caused by DC pole-to-pole fault in modular multilevel converter HVDC(MMC-HVDC) threatens system security seriously. The hybrid HVDC breaker is installed on the DC line to block the fault current. The analysis of fault mechanism is divided into the periods before and after converter is blocked. The overcurrent characteristics of bridge legs and DC line is emphatically analyzed caused by...
This paper assesses the accuracy of a transient 2D axis-symmetric FE model of a Thomson coil actuator compared with experimental results. Sources of error in the coil representation are identified and the 2D model is compensated accordingly for improved accuracy. Experimental results validate the proposed approach and effects of armature bending in the predicted armature velocity are investigated...
Voltage source converters (VSC) are increasingly being used in high voltage direct current (HVDC) systems and with higher power ratings of these converters, the interest for usage with long transmission system is also increasing. With long overhead transmission dc links, many faults would be transient or temporary in nature. Such faults are mainly caused by lightning. The objective of this paper lies...
In a multi-terminal high-voltage direct current based on voltage source converter, the proactive hybrid HVDC breaker is an important component in DC grids to isolate a DC fault. From the DC breaker design point, it is crucial to realize a fast fault current breaking. Hybrid HVDC breaker based on delay slope method for breaking signal has more fast action. Especially for overhead lines of DC grid,...
Recent development in DC technologies and renewable energy increase the requirement in building large HVDC networks. The world first Zhoushan five-terminal HVDC project constructed in China has been put into operation. To increase the operation reliability, a HVDC circuit breaker will be required. However the existing HVDC breaker developed in recent years still can't deal with severe fault current...
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