| Summary: | 博士 === 國立高雄第一科技大學 === 工學院工程科技博士班 === 106 === The objective of this dissertation is to propose four kinds of high-efficiency DC/DC power converters for green-energy and energy-storage systems are proposed. In addition, a novel maximum power point tracking (MPPT) for PV panel is also presented. The design core of the four proposed converters is how to reduce component count and simplify converter configuration so as to improve conversion efficiency and accomplish easy control.
In this dissertation, a simplest analog circuit is first discussed, which fulfills MPPT based on double-linear approximation (DLA) criterion. With the analog circuit, the maximum power point (MPP) of a PV panel can be determined quickly and accurately without complicated calculations even under varying atmospheric conditions.
After the exploring of the DLA criterion, four novel converters, which are dual-input PV-wind converter (DIPWC), high-step-up DC/DC converter (HSUDC), isolated bidirectional DC/DC converter (IBDC) and bidirectional DC/DC converter (BDC), are presented. The DIPWC is capable of dealing with photovoltaic and wind-turbine energies simultaneously, while the HSUDC is for the achievement of high voltage ratio with interleaved operation for PV panel. The IBDC is a DC/DC converter having the features of high voltage-conversion ratio and bidirectional energy control, which is suitable for energy storage system. At last, the BDC is discussed. Even though this converter is also a kind of bidirectional DC/DC converter, it can perform soft-switching feature at all power switches.
All the proposed converters and the DLA method are simulated and then tested by hardware. Simulations and practical measurements have validated the four converters and the DLA criterion.
Keywords : MPPT, high voltage ratio, interleaved operation, bidirectional DC/DC converter, soft-switching feature.
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