A Flexible DC System Control Strategy to Reduce Strike Impact Based on Lightning Early Warning

Abstract

With the current world climate change, the lightning impact on the power system becomes more significant. Power outages caused by severe weather such as lightning occur frequently. It harms the power grid devices and makes bad impacts on people's daily life and production. Besides, with the development of AC/DC hybrid grid, plenty of power electronic devices are connected, which are vulnerable to severe weather. To protect the DC grid from the lightning disturbance, a control strategy for DC grid based on lightning early warning is proposed. Considering the dynamic lightning protection and various demands of DC grid, the proposed strategy adopts proper DC system control strategy in advance to adjust power flow flexibly, then it uses lightning forecast data to adjust the converter control strategies and DC power flow in real time. Therefore, the method improves the safety and stability of the DC grid under lightning.