Abstract
This paper analyses reliability data of HVDC systems of Southern China Power Grid. The weak links of HVDC systems’ operational reliability are DC control and protection, valve hall and valve cooling system and transmission lines. Some improvement measures and HVDC system reliability technology are proposed in this paper.
Highlights
HVDC Transmission has obvious advantages in the respect of long distance transmission on a large scale and interconnection of power systems
According to the distribution of causes of DC blocks in daily operation, this paper focuses on DC
Since Gaozhao and Xingan HVDC system went into operation, there were problems that DC filter quited operation or even caused system block.The DC filter protection of Anshun converter station has acted 10 times since 2004, where capacitor C1 unbalance protection acted 8 times
Summary
HVDC Transmission has obvious advantages in the respect of long distance transmission on a large scale and interconnection of power systems. [1] Data shows that the availability rate of operating HVDC systems is over 90 percent. The reliability in HVDC systems indicates the amount of power transmitted in specified time, conditions and environment. It has been proposed in InterMountain HVDC system that reliability level of bipolar. Taking measures to improve HVDC systems reliability can guarantee the secure and available operation of HVDC systems
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