Study On Temperature Rise Test Of Valve Bridge Arm Reactor For Vsc-Hvdc System Based On Equivalent Loss

Aiming at the difference of DC and AC harmonic current characteristics between valve bridge arm reactor for VSC-HVDC system and conventional DC smoothing reactor, based on the Yunnan asynchronous interconnection project, this paper studies and presents the necessity of additional AC temperature rise test for bridge arm reactor, based on equivalent loss principle, recommends AC temperature rise test methods and compares temperature rise experiments to conventional DC and AC dry-type air-core reactor. Results show that firstly, the methods of temperature rise design and test for bridge arm reactor should not simply follow those methods for conventional DC smoothing reactor based on DC current distribution characteristics and AC dry-type air-core reactor based on AC current distribution characteristics, secondly, the bridge arm reactors for Yunnan asynchronous interconnection project meet the temperature rise limit value requirements in AC-DC combined current. Finally, the test method of temperature rise of bridge arm reactor for VSC-HVDC in this paper can be used to guide temperature rise tests of the dry-type reactor in future projects.The research can provide reference for type design and selection of reactors under AC-DC combined large current in future projects.