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- 저자 : A. Kukita (검색결과 2 건)
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M. Uno,A. Kukita 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
In recent photovoltaic (PV) systems, an energy storage source is often installed for power leveling and/or night-time power supply. However, such PV systems require multiple converters, including a voltage equalizer for series-connected PV modules to preclude negative impacts of partial shading, central converter for PV string control, and equalizer for series-connected energy storage cells to ensure years of safe operation, and therefore, PV systems are prone to complexity. To realize the system-level simplification, a PWM converter integrating voltage equalizers for PV modules and energy storage cells is proposed in this paper. The proposed integrated converter comprises a switched capacitor converter (SCC), PWM buck converter, and series-resonant voltage multiplier (SRVM) that perform PV equalization, string control, and cell equalization, respectively. The derivation procedure of the integrated converter is explained and discussed, followed by operation analysis. An experimental test was performed using series-connected supercapacitor (SC) modules and solar array simulators to emulate a partial-shading condition. With the integrated converter, the extractable maximum power from the PV modules was significantly improved while voltage imbalance of SC modules was adequately eliminated, demonstrating the integrated performance of the proposed converter.
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M. Uno,A. Kukita 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
Differential power processing converters or voltage equalizers have been proposed and used for photovoltaic (PV) string comprising multiple modules/substrings connected in series in order to preclude negative influences of partial shading. The single-switch voltage equalizer using multi-stacked buck-boost converters can significantly reduce the necessary switch count compared to that of conventional topologies, achieving simplified circuitry. However, multiple current sensors are necessary for this single-switch equalizer to effectively perform equalization. In this paper, a current sensorless equalization technique, ΔV-controlled equalization, is presented. An equalization strategy using the ΔV-controlled equalization is explained and discussed on the basis of comparison with other equalization strategies. Experimental equalization tests emulating partial-shading conditions were performed using the single-switch equalizer employing the ΔV-controlled equalization. Negative impacts of partialshading were successfully precluded, demonstrating the efficacy of the proposed ΔV-controlled equalization strategy.
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