Robust Artificial Intelligence Controller for Stabilization of Full-Bridge Converters Feeding Constant Power Loads
Arman Fathollahi, Meysam Gheisarnejad, Björn Andresen, Hamed Farsizadeh, Mohammad Hassan Khooban
Abstract
The dc/dc full-bridge (FB) converters are often utilized as the interface system in telecom power applications. The constant power loads (CPLs) in the telecom power systems demonstrate negative impedance which threatens the stability of the dc/dc converters. To address this issue, in this brief, a nonlinear controller is designed for the stabilization of the dc/dc full-bridge converter feeding CPLs. The soft actor–critic (SAC) algorithm with deep neural networks is adopted based on deep reinforcement learning (DRL) for optimal tuning of the controller parameters in the control law of an established nonlinear controller. According to the control requirements of the FB interface system, a reward signal is defined to train the neural networks of SAC. An efficient solution based on Hardware-in-the-Loop (HIL) is adopted for verifying and validating the feasibility of the proposed scheme using the OPAL-RT 5600.