Distributed Model-Predictive Energy Management Strategy for Shipboard Power Systems Considering Battery Degradation

TL;DR

This paper proposes a distributed energy management strategy for shipboard power systems that optimizes generator use and minimizes battery degradation, effectively handling high ramp rate loads and improving energy storage health.

Contribution

It introduces a novel heuristic-based control strategy that balances generator efficiency and battery health in real-time shipboard power management.

Findings

Effective management of energy storage health demonstrated

Improved handling of high ramp rate loads

Enhanced generator efficiency and stability

Abstract

With the integration of loads such as pulse power loads, a new control challenge is presented in meeting their high ramp rate requirements. Existing onboard generators are ramp rate limited. The inability to meet the load power due to ramp rate limitation may lead to instability. The addition of energy storage elements in addition to the existing generators proves a viable solution in addressing the control challenges presented by high ramp rate loads. A distributed energy management strategy maximizing generator efficiency and minimizing energy storage degradation is developed that facilitates an optimal adaptive power split between generators and energy storage elements. The complex structure of the energy storage degradation model makes it tough for its direct integration into the optimization problem and is not practical for real-time implementation. A degradation heuristic to minimize absolute power extracted from the energy storage elements is proposed as a degradation heuristic measure. The designed strategy is tested through a numerical case study of a consolidated shipboard power system model consisting of a single generator, energy storage element, and load model. The results show the impact of the designed energy management strategy in effectively managing energy storage health.