Abstract
This paper proposes a high-performance control technique based on Lyapunov’s stability theory for a single-phase grid-connected neutral-point-clamped quasi-impedance source inverter with LCL filter. The Lyapunov function based control is employed to regulate the inverter output current, whereas the proportional resonant controller is used to produce the reference of the inverter output current that is needed in the Lyapunov function based control. Use of proportional resonant controller ensures the zero steady-state error in the grid current. An important feature of the proposed Lyapunov function based control is the achievement of resonance damping without using a dedicated damping method. Furthermore, the modified simple boost control technique is proposed to eliminate the double-line frequency ripples in the quasi-impedance source inductor currents and minimize the double-line frequency ripples in the quasi-impedance source capacitor voltages. The proposed control technique considerably reduces the inverter size, weight, and cost as well as increases overall system efficiency since the required inductances and capacitances sizes are lower. Experimental results obtained from a 2.5 kW neutral-point-clamped quasi-impedance source inverter prototype are presented to validate the performance of the Lyapunov function based control technique.
Highlights
The power electronic converters play significant role in converting unregulated dc power into regulated ac power in photovoltaic (PV) systems
The neutral-point-clamped (NPC) inverter is one of the popular multilevel inverters (MI) topologies that is employed in many industrial applications [1,2,3]
As a remedy to these problems, the NPC quasi-Z Source inverter topologies are evolved as alternative solutions in PV systems
Summary
The power electronic converters play significant role in converting unregulated dc power into regulated ac power in photovoltaic (PV) systems. The main role of PV inverters is to convert unregulated dc power into regulated ac power. Different power converter topologies, which are mainly divided into two main streams namely single-stage (dc-ac inverter) and dual-stage In the dual-stage topology, an additional dcdc converter is required to boost the dc voltage to the desired level. The main advantage of this topology is the ability to regulate the voltage fluctuations in a single-stage. This topology requires less number of switches compared to dual-stage topologies, which means lower costs [4,5,6,7]
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