Type of Document Master's Thesis Author Smith, Christopher Lee Author's Email Address firstname.lastname@example.org URN etd-08122005-113924 Title Modeling and Control of a Six-Switch Single-Phase Inverter Degree Master of Science Department Electrical and Computer Engineering Advisory Committee
Advisor Name Title Lai, Jason Committee Chair Baumann, William T. Committee Member Nelson, Douglas J. Committee Member Keywords
- single-phase inverter
- transient performance
- power electronics
- state space control
Date of Defense 2005-08-05 Availability unrestricted AbstractDistributed generation for consumer applications is a relatively new field and it is difficult to satisfy both cost and performance targets. High expectations coupled with extreme cost cutting to compete with traditional technologies make converter design difficult. As power electronics mature more opportunities arise for entry into this lucrative area. An excellent understanding of converter dynamics is crucial in producing a well performing and cost competitive system.
The six-switch single-phase inverter proposed in this thesis is a prime candidate for use in single households and small businesses. Its compact size and compatibility with existing electrical standards make its integration easy. However, little work is available on characterizing the system from a controls point of view. In particular balancing the two outputs with an uneven load is a concern. This thesis uses nodal and loop analysis to formulate a mathematical model of the six-switch single-phase inverter. A non-linear time invariant model is constructed for circuit simulation; details found in real circuits are added.
A hardware-in-the-loop (HIL) configuration is used for more accurate simulation. In fact, its use makes for an almost seamless transition between simulation and hardware experimentation. A detailed explanation of the HIL system developed is presented.
The system is simulated under various load conditions. Uneven loads and lightly loaded conditions are thoroughly examined. Controllers are verified in simulation and then are tested on real hardware using the HIL system. DC bus disturbance rejection and non-linear loads are also investigated. Acceptable inverter performance is demonstrated without expensive current sensors or high sampling frequency.
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