Document Type

Thesis

Degree

Master of Science

Department

Electrical Engineering

First Advisor's Name

Behrooz Mirafzal

First Advisor's Title

Committee Chair

Second Advisor's Name

Jean Andrian

Third Advisor's Name

Chen Liu

Keywords

Hybrid Motor Drives, Sustainable Energy

Date of Defense

2011

Abstract

The purpose of this thesis was to explore the behavior in power sharing and control of Hybrid Motor Drives. In this research, a solar-based hybrid adjustable-speed pump, which has been developed in the laboratory, was used to investigate the power-sharing in hybrid (dual-input) motor-drive systems. The laboratory test setup contained a DC-DC module connected to the DC-bus capacitors of a 2.5hp 230V PWM-based adjustable-speed motor-drive. The experimental results demonstrate that the power-sharing of a Photovoltaic (PV) array/DC-DC converter is not a function of motor speed in hybrid solar-based motor-drives, as long as the power contribution of the AC-grid stays above zero. In these conditions, the PV-DC-DC module behaves like a current source, and the dynamic behavior of the motor is decoupled from the dynamic behavior of the AC-grid, given that the PV-DC-DC module can provide the motor load.

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