Analysis of Direct Current Control Structures with Implementation Approaches

In this paper, we analyze several control structures for direct current control and develop corresponding simulation models for detailed simulation and comparative analysis. We investigate the advantages and disadvantages of these control architectures in both steady-state and dynamic performance aspects. Furthermore, we particularly focus on implementing Space Vector Pulse Width Modulation (SVPWM) to track reference voltage vectors for STATCOM current control, while incorporating adjustable DC-side voltage capability. The SVPWM implementation typically involves sector identification, vector time calculation, and switching sequence generation algorithms to achieve precise voltage vector tracking. Through these investigations, we gain deeper insights into the principles and practical applications of direct current control systems, including key functions such as reference frame transformation, current regulator design, and modulation index calculation for optimal performance.