Abstract
This paper introduces a new topology for a DC-DC converter with bipolar output and high voltage gain. The topology was designed with the aim to use only one active power switch. Besides the bipolar multiport output and high voltage gain this converter has another important feature, namely, it has a continuous input current. Due to the self-balancing bipolar outputs, the proposed topology is suitable for bipolar DC microgrids. Indeed, the topology balancing capability can achieve the two symmetrical voltage poles of bipolar DC microgrids. Furthermore, it is possible to create a midpoint in the output of the converter that can be directly connected to the ground of the DC power supply, avoiding common-mode leakage currents in critical applications such as transformerless grid-connect PV systems. The operating principle of the proposed topology will be supported by mathematical analysis. To validate and verify the characteristics of the presented topology, several experimental results are shown.
Highlights
Energy conversion systems are extremely important for modern societies and are present in different forms in most domestic, commercial and industrial applications [1]
This paper introduces a new topology for a DC-DC converter with bipolar output and high voltage gain
This study proposed a novel DC-DC power converter topology that is especially suited for bipolar DC microgrids or transformerless grid-connect PV and fuel cell generators
Summary
Energy conversion systems are extremely important for modern societies and are present in different forms in most domestic, commercial and industrial applications [1]. Despite several advantages of non-isolated boost converters, some require multiple switching devices to achieve high-step-up voltage gains, which increase the cost and complexity. Besides the important advantage of self-balancing the bipolar DC microgrid, the proposed converter has high voltage gain and continuous input current. ANALYSIS AND OPERATING PRINCIPLE OF THE PROPOSED DC-DC CONVERTER As mentioned before, the circuit allows for continuous input current and high voltage gain. The voltage gain of this power converter topology can be determined from the analysis of the described two operating modes Taking into consideration these modes and that the average value of voltages of the two inductors in steady-state are equal to zero, it is possible to obtain:. From the voltage gain given by this last equation it is foreseen that the proposed topology extends the voltage gain to the double of the conventional quasi-Z DC-DC converter, or obtains two outputs with the same gain
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