Abstract
The zeta inverter has been used for single-phase grid-tied applications. For its use of energy storage systems, this paper proposes the bidirectional operation scheme of the grid-tied zeta inverter. A shoot-through switching state is introduced, providing reliable bidirectional operation modes. A shoot-through duty cycle is utilized for the bidirectional grid current control of the inverter. The grid current is bidirectionally controlled by the shoot-through duty cycle, which enables the inverter to operate with seamless change of operation modes. Over the state-of-the art techniques using flyback and Cuk inverter topologies, the grid-tied zeta inverter using the proposed operation scheme provides advantages of high efficiency, low cost, and high reliability. The operation principle is presented by describing the operation mode and control method for the grid-tied zeta inverter. A 500 W prototype has been built and tested to verify its operation principle.
Highlights
Up to now, various single-phase isolated grid-tied inverters have been developed with renewable energy sources [1,2,3,4,5,6,7,8,9,10]
This paper proposes the bidirectional operation scheme of the grid-tied zeta inverter for energy storage systems
As the same nominal and controlled shoot-through duty cycles can be defined for both operation modes, the bidirectional grid current control can be performed in a unified controller
Summary
Various single-phase isolated grid-tied inverters have been developed with renewable energy sources [1,2,3,4,5,6,7,8,9,10]. The grid-tied zeta inverter can solve the drawbacks of the current state-of-the art inverters because it does not use the bidirectional switch at the grid side [9,10]. It can reduce the circuit components and improve the power density. The shoot-through switching state provides reliable bidirectional operation modes for the grid-tied zeta inverter. It describes the circuit configuration, operation mode, and control method.
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