Abstract
This article presents a model predictive self-healing control (MPSC) scheme for battery system interfaced dual active bridge (DAB) converter in navy ship power system (NSPS) with pulsed power loads (PPLs). The voltage and frequency of NSPS are vulnerable to PPLs energization. A properly controlled battery system with fast dynamic response can mitigate this vulnerability. Model predictive control (MPC) is a potential solution for the battery system interfaced DAB converter to achieve fast dynamic response and mitigate disturbances imposed to the NSPS by PPLs. However, conventional MPC framework suffers from current prediction error due to the pulsating AC-link inductor's voltage profile in DAB converter. This article proposes a self-healing control loop that utilizes the feasible range of power transfer in conjunction with the AC-link inductor's voltage profile. The proposed method can validate and autonomously correct the predicted current and phase shift in DAB converter interfaced a battery system. The proposed control scheme on DAB converter prevents voltage and frequency collapse in a hybrid AC/DC NSPS particularly during the PPL energization. The system stability is studied based on Lyapunov stability analysis. The theoretical concepts are validated by several case studies implemented on a hardware-in-the-loop (HIL) testbed of a NSPS. The case studies demonstrate voltage and frequency regulation of the NSPS with fast dynamic response during PPLs energization. The proposed MPSC performance is compared with proportional-integral (PI) based control for DAB in NSPS with PPLs.
Highlights
N AVY Ship Power System (NSPS) commonly consists of loads with different behaviors
In conventional ship power systems, the system is based on radial architecture and the loads are supplied by separate generators
The model predictive self-healing control (MPSC) process is initiated by the AC-link inductor current prediction and it ends by an accurate estimation of desired phase shift to obtain the optimum switching signal
Summary
N AVY Ship Power System (NSPS) commonly consists of loads with different behaviors. These loads can be categorized such as ship propulsion system, pulsed power loads (PPLs), Manuscript received March 26, 2020; revised June 25, 2020; accepted July 25, 2020. This protects the high frequency transformer from reaching saturation This approach is based on increasing the control bandwidth which is a challenging requirement for application of MPC on DAB converter for PPLs. Authors in [24] have introduced a moving discretized-control-set MPC approach for DAB converters. Authors in [24] have introduced a moving discretized-control-set MPC approach for DAB converters The purpose of this control approach is to regulate load voltage of the DC microgrid and minimize the DAB converter high frequency transformer peak current. The main contribution of this paper is to address the challenges associated with design of MPC framework for DAB in NSPS in response to voltage and frequency deviations due to PPL energization.
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