Control Design of a Single-Phase DC/AC Inverter for PV Applications
A thesis submitted in partial fulfillment
of the requirements for the degree of
Master of Science in Electrical Engineering
by
Haoyan Liu
Harbin University of Science and Technology
Bachelor of Engineering in Automation, 2012
University of Arkansas, Fayetteville
Abstract
This thesis presents controller designs of a 2 kVA single-phase inverter for photovoltaic
(PV) applications. The demand for better controller designs is constantly rising as the renewable
energy market continues to rapidly grow. Some background research has been done on solar
energy, PV inverter configurations, inverter control design, and hardware component selection.
Controllers are designed both for stand-alone and grid-connected modes of operation. For standalone
inverter control, the outer control loop regulates the filter capacitor voltage. Combining the
synchronous frame outer control loop with the capacitor current feedback inner control loop, the
system can achieve both zero steady-state error and better step load performance. For grid-tied
inverter control, proportional capacitor current feedback is used. This achieves the active
damping needed to suppress the LCL filter resonance problem. The outer loop regulates the
inverter output current flowing into the grid with a proportional resonant controller and harmonic
compensators. With a revised grid synchronization unit, the active power and reactive power can
be decoupled and controlled separately through a serial communication based user interface. To
validate the designed controllers, a scaled down prototype is constructed and tested with a digital
signal processor (DSP) TMS320F28335.
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