Centenary of Japanese micropaleontology : contributed papers by edited by Kunihiro Ishizaki and Tsunemasa Saito.

By edited by Kunihiro Ishizaki and Tsunemasa Saito.

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Multiple PV modules are connected in parallel and/or in series and they feed the dc power to a central inverter. This technology is plant-oriented and the power rating of the central converter can be up to several Megawatts [14]. However, the central converter technology has the following main disadvantages: • The dc cabling design is complex [18], • The central converter must be individually designed [17], 9 • Maximum Power Point Tracking (MPPT) cannot be applied to individual PV modules [18], • The output power decreases due to module mismatching and partial shading conditions [16], [19], and • The reliability of the PV plant is limited due to the dependence of one single converter [16].

Li and P. Wolfs, “A Current Fed Two-Inductor Boost Converter with Lossless Snubbing for Photovoltaic Module Integrated Converter Applications,” in Proceedings of 36th IEEE Power Electronics Specialists Conference, Recife, Brazil, June 2005, pp. 2111-2117. [xi] Q. Li and P. Wolfs, “A Leakage-Inductance-Based ZVS Two-Inductor Boost Converter with Integrated Magnetics,” IEEE Power Electronics Letters, Vol. 3, No. 2, pp. 67-71, June 2005. xxxvi [xii] Q. Li and P. Wolfs, “Analysis and Design of a Passive Lossless Snubber in the Two-Inductor Boost Converter with a Variable Input Voltage,” in Proceedings of 32nd Australasian Universities Power Engineering Conference, Hobart, Australia, September 2005, pp.

The left leg switches operate at high frequencies to control the current injected to the grid while the right leg switches are controlled by the polarity of the grid voltage and switch synchronously with the zero crossings of the grid voltage. This control approach might allow the switching loss in the inverter to be reduced compared with that in the conventional hard-switched PWM inverter. However, this bridge does have less modulation range opportunities. A conventional bridge can achieve frequency doubling by applying phase shifted switching control between the bridge legs.

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