Design and evaluation of voltage control techniques by hierarchical coordination of multiple power converters in low-voltage dc distribution systems

Abstract

This paper focuses on voltage control schemes for lowvoltage DC (LVDC) distribution systems that has been studied for electrification of rural sides in South Korea. Telecommunication repeaters on mountain tops can be a good application for LVDC systems because it needs DC power rather than AC and low-voltage distribution can reduce the operation and maintenance costs for distribution network operators (DNOs). However, lowvoltage distribution can suffer voltage regulation issues depending on the size of the systems. This paper presents the design concept of multi-agent based hierarchical control schemes for distribution voltage regulation and evaluation of the control performance by simulation studies.