Backup Power Supply Retrofit Scheme for Distribution Automation Terminals Using "Capacitor + Battery" Hybrid System

There are two backup power configurations for distribution automation terminals: capacitors and batteries, each with its distinct advantages. This study proposes a hybrid approach combining both capacitors and batteries to leverage their complementary strengths and mitigate individual limitations. Building upon the existing supercapacitor infrastructure, batteries are integrated into the retrofit scheme. Testing demonstrates that the "capacitor + battery" configuration is economically viable. This retrofit scheme is worthy of being promoted and applied, as long as the battery installation space within the distribution automation terminal enclosure is adequate.