Abstract
In this paper, a novel single-phase transformerless Z-source inverter (ZSI) derived from the basic SEPIC topology, which is named SEPIC-based ZSI, is proposed. The negative end of the input DC voltage of this topology is directly connected to the load and grounded, which can completely eliminate leakage current. Furthermore, this topology has some attractive characteristics such as buck–boost capability, impressive voltage gain, linear voltage gain is realized by a simple control method, and so on. The theoretical design and simulation results are demonstrated by corresponding experiments carried out on a 500 W laboratory prototype controlled by using a DSP TMS320F28335 controller combined with a FPGA SPARTAN-6.
Highlights
At present, with the consumption of fossil fuels and environmental pollution, people are increasingly persistent in the development of renewable distributed energy generation systems such as photovoltaic (PV), fuel cell (FC), and so on [1,2,3,4,5]
A novel SEPIC-based Z-source inverter that eliminates leakage current is proposed in this paper
The feature of the proposed topology is a combination of a Z-source inverter and a SEPIC converter, so the current inverter has the advantages of both a SEPIC converter and a Z-source inverter, which has a high voltage gain
Summary
With the consumption of fossil fuels and environmental pollution, people are increasingly persistent in the development of renewable distributed energy generation systems such as photovoltaic (PV), fuel cell (FC), and so on [1,2,3,4,5]. Photovoltaic power generation, which is used to convert solar energy into electricity, is the most widely applied [6,7,8]. The output electricity is DC, and an inverter is necessary for the photovoltaic power generation system [9]. Based on the availability of transformers, inverters are divided into isolated inverters and non-isolated inverters [10]. Isolated inverters have the advantage of isolating, which can eliminate leakage current and ensure the safety of staff. The isolated inverters will have a large volume and loss due to the existing transformers [11], which do not meet the concept of energy saving. More people have turned their attention to non-isolated inverters [12]
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