T. Vu | Searcharxiv

arXiv2021

Energy Storage Peak Shaving Feasibility: Case Studies in Upstate New York

This paper presents the results of a benefit-cost analysis involving the application of battery energy storage systems (BESS) for three of New York State's municipal electric departments (MEDs). New York's municipal electric utilities generally have allocations to receive hydroelectric energy from the New York Power Authority (NYPA). When the NYPA firm hydro allocation is exceeded, the utility must procure energy from other sources, generally at significantly higher prices. Additionally, the municipal utility pays to transmit the energy from the generation source to the utility gateway. There are multiple ways that these MED's can use energy storage technology to reduce their costs. This paper develops benefit and cost analyses, and concludes that BESS technology is cost-effective in some cases, and will become more cost-effective in the future as battery prices decrease.

math.OC↗

arXiv2020

Integrated real-time supervisory management for off-normal-event handling and feedback control of tokamak plasmas

For long-pulse tokamaks, one of the main challenges in control strategy is to simultaneously reach multiple control objectives and to robustly handle in real-time (RT) unexpected events (off-normal-events -- ONEs) with a limited set of actuators. We have developed in our previous work a generic architecture of the plasma control system (PCS) including a supervisor and an actuator manager to deal with these issues. We present in this paper recent developments of real-time decision-making by the supervisor to switch between different control scenarios (normal, backup, shutdown, disruption mitigation, etc.) during the discharge, based on off-normal-event states. We first standardize the evaluation of ONEs and thereby simplify significantly the supervisor decision logic, as well as facilitate the modifications and extensions of ONE states in the future. The whole PCS has been implemented on the TCV tokamak, applied to disruption avoidance with density limit experiments, demonstrating the excellent capabilities of the new RT integrated strategy.

eess.SY↗