2022/03/17 by Rahul Mallik, Mallik, Rahul
Computer Science · Engineering · #Advanced DC-DC Converters #FOS: Electrical engineering #Microgrid Control and Optimization #Multilevel Inverters and Converters #Systems and Control (eess.SY) #cs.SY #eess.SY #electronic engineering #information engineering
paper · pdf · doi:10.48550/arxiv.2203.09022
10 pages, 21 figures
arxiv created 2022/03/17 · openalex publication_date 2022/03/17 · arxiv updated 2022/03/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Conventional dc-dc, dc-ac converter control entail an inner current and outer voltage (ICOV) control loop. Stability of multi-loop control is achieved by ensuring faster dynamics of inner loops, often separating the bandwidths by large factors. Heuristically a factor-of-ten has often been used to separate the bandwidths of two adjacent loops in the nested architecture. In this paper, we present a numerical method to optimally select the ratio of bandwidths for a nested controller. We first manipulate the robust framework to show that the optimal H_∞ subsumes the classical inner current outer voltage control. We then use optimality of the proposed H_∞ controller to inspect feasibility of different ratios of bandwidths of the inner and outer controllers. We finally select the numerically closest bandwidths of the two nested loops which the guarantee stability. Simulation models are used to verify the optimal bandwidth separation for a candidate grid-forming dc-ac converter with inner current-outer voltage control.