Doctoral Dissertations


Xin Qiu

Keywords and Phrases

Efficiency characterization; Energy storage; Microgrid; Renewable energy; Vanadium redox battery


"The vanadium redox flow battery (VRB) is well suited for the applications of microgrid and renewable energy. This thesis will have a practical analysis of the battery itself and its application in microgrid systems. The first paper analyzes the VRB use in a microgrid system.

The first part of the paper develops a reduced order circuit model of the VRB and analyzes its experimental performance efficiency during deployment. The statistical methods and neural network approximation are used to estimate the system parameters. The second part of the paper addresses the implementation issues of the VRB application in a photovoltaic-based microgrid system. A new dc-dc converter was proposed to provide improved charging performance. The paper was published on IEEE Transactions on Smart Grid, Vol. 5, No. 4, July 2014.

The second paper studies VRB use within a microgrid system from a practical perspective. A reduced order circuit model of the VRB is introduced that includes the losses from the balance of plant including system and environmental controls. The proposed model includes the circulation pumps and the HVAC system that regulates the environment of the VRB enclosure. In this paper, the VRB model is extended to include the ESS environmental controls to provide a model that provides a more realistic efficiency profile. The paper was submitted to IEEE Transactions on Sustainable Energy.

Third paper discussed the optimal control strategy when VRB works with other type of battery in a microgrid system. The work in first paper is extended. A high level control strategy is developed to coordinate a lead acid battery and a VRB with reinforcement learning. The paper is to be submitted to IEEE Transactions on Smart Grid"--Abstract, page iv.


Crow, Mariesa

Committee Member(s)

Kimball, Jonathan W.
Shamsi, Pourya
Ferdowsi, Mehdi
Elmore, A. Curt


Electrical and Computer Engineering

Degree Name

Ph. D. in Electrical Engineering


Missouri University of Science and Technology

Publication Date

Fall 2014

Journal article titles appearing in thesis/dissertation

  • Field validated model of a vanadium redox flow battery for microgrids
  • A balance-of-plant vanadium redox battery system model
  • Heterogeneous energy storage optimization for microgrids


xi, 95 pages

Note about bibliography

Includes bibliographical references (pages 93-94).


© 2014 Xin Qiu, All rights reserved.

Document Type

Dissertation - Open Access

File Type




Subject Headings

Renewable energy sources
Storage batteries -- Design and construction
Vanadium -- Electric properties
Smart power grids
Photovoltaic cells

Thesis Number

T 10621

Electronic OCLC #