Providing a stable voltage at the nominal level according to universally accepted standards is a primary concern of any public electricity network. In a renewable energy fed power electronic based DC microgrid system, renewable sources can have fluctuating power characteristics due to various environmental factors. In such an environment, chances of voltage instability are highly probable due to varying power nature of renewable sources and loads connected. In this paper, a bidirectional converter connected with a battery storage is controlled based on the voltage of the microgrid in order to tackle the aforementioned problem. A selector based control algorithm in conjunction with a proportional-integral controller is used to trigger the bidirectional converter. Proposed control technique is simulated in a 60V DC microgrid and results are provided.
Bharath K. R., H, C., and Dr. P. Kanakasabapathy, “Control of bidirectional DC-DC converter in renewable based DC microgrid with improved voltage stability”, International Journal of Renewable Energy Research-IJRER, vol. 8, 2018.