Semester

Spring

Date of Graduation

2013

Document Type

Thesis

Degree Type

MS

College

Statler College of Engineering and Mineral Resources

Department

Lane Department of Computer Science and Electrical Engineering

Committee Chair

Parviz Famouri

Committee Co-Chair

Muhammad A. Chouhdry

Committee Member

Yaser P. Fallah

Abstract

The need for storing energy has grown in correlation with the need for renewable and distributed energy resources. Designing a storage unit system which complements the distributed generation is required for increased efficiency and reducing the burden on the utility grid. The energy storage model used in this thesis is the Li-ion battery which is efficient, has high energy density and has applications in field of electronics, transportation and electric power industry. The wind turbine generator, photovoltaic (PV) and the energy storage unit modeled in this work share a symbiotic relationship even though they are completely separate entities which can be connected at separate locations. This study contributes better control as well as ease of connection to the system. To show the effect of storage unit on microgrid distribution system two test systems were considered, standalone system and standard IEEE 13 node feeder system with wind turbine generator and photovoltaic panel. The integration and control of energy storage system is achieved using a battery energy management control (BEMC) at the upper level and a real/reactive power controlled voltage source converter at the lower level. To enhance the control, optimization is performed where the proportional gain and the integral time constant of the PI controller are optimized using genetic algorithm which reduces the losses and increases the efficiency of the system. The results show that the battery energy management control system is effective in controlling the modes of operation of energy storage module based on the wind and solar conditions and is able to completely balance the power produced by the wind generator and PV modules. In this thesis all the test systems and the control were implemented in PSCAD as it is emerging as the new industry standard for transient power applications research.

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