Distributed Real-Time Optimal Power Flow Control of PEPDS
Abstract
Power Electronics Power Distribution System (PEPDS) is a revolutionary concept for high-performance applications. Through significant developments of power electronics and control techniques, the efficiency, flexibility, reliability, security, survivability, etc.of the PEPDS can be significantly improved. Current research focus with PEPDS is mainly with hardware development of the integratedPower Electronics Building blocks. To materialize the PEPDS concept for future successful deployment, many important research topics need to be investigated. This proposal targets at a long-existing problem with power systems, which is the difficulty with realizing real-time Optimal Power Flow (OPF) control. The proposed control solutions can significantly improve the energy efficiency and reliability of the PEPDS. The excellent power and control hardware of a PEPDS can support the successful implementation of the proposed control solutions.An immediate application of the PEPDS concept is the high-performance shipboard power system (SPS), which is hard to control due to the small inertia, large uncertainties, and wide range of operating conditions. Just like other complex systems,it is natural to adopt hierarchical control scheme to conquer the computational complexity and to reduce the communication requirement. The traditional hierarchical control scheme has three levels for primary control, secondary control, and tertiary control, respectively, from bottom to top. The decentralized primary control targets at transient stability through real-time load sharing control. The centralized secondary and tertiary controls are in charge of system-wide steady-state stability and energy efficiency, respectively. Due to the disconnection between system-wide periodical optimization and local real-time control, optimal operation and individual voltage regulation cannot be realized. The proposed control solution for the PEPDS based AC and DC microgrids will solve the OPF problem online through real-time closed-loop control. The PI and his research team will design distributed control rules to dynamically drive the system to the optimal OPF solution and guarantee the convergence through rigorous stability analysis. Various operational constraints, such as generation bounds, individual bus voltage bounds, line current bounds, will be considered. Uncertainties with both physical and cyber subsystems will also be addressed. The SPS under the proposed control will be not only more energy efficient but also much more reliable. For a naval ship, it means that the ship can travel longer distance and has better survivability. The proposed control solutions will be tested through both detailed model based simulations and hardware experimentations.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 06, 2021
- Source ID
- N000142112175
Entities
People
- Wenxin Liu
Organizations
- Lehigh University
- Office of Naval Research
- United States Navy