An optimal control method for photovoltaic grid tied-interleaved fly-back micro-inverters
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The document proposes a new hybrid control strategy for interleaved flyback microinverters that combines two-phase discontinuous conduction mode control and one-phase discontinuous conduction mode control. This hybrid control strategy aims to improve efficiency over a wide load range by reducing different dominant losses that occur under heavy and light loads. The document presents an optimal design method for the hybrid control based on boundary conditions and experimental results that verify the benefits of the proposed control strategy.
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El documento presenta información sobre nomenclatura de óxidos e hidróxidos inorgánicos. Contiene tablas con los nombres sistemáticos, tradicionales y de stock de varios compuestos. También incluye ejercicios para completar nombres, fórmulas y tablas, así como preguntas de selección múltiple sobre nomenclatura de estos compuestos.
Chequeo
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Matlab local directional number pattern for face analysis face and expressio...
Ecway Technologies is a company that provides IEEE projects and software developments with offices in multiple cities across India. They specialize in local directional number pattern analysis for face and expression recognition. This paper proposes a novel local feature descriptor called local directional number pattern (LDN) that encodes directional information of textures in a compact way, producing a more discriminative code than current methods. LDN extracts directional information from micro-patterns using a compass mask and encodes this using prominent direction indices and signs. The face is divided into regions and LDN features are extracted and concatenated into a feature vector to describe the face. Experiments show the descriptor performs well under variations in illumination, noise, expression, and time lapse. The
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An optimal control method for photovoltaic grid tied-interleaved fly-back micro-inverters
- 1. AN OPTIMAL CONTROL METHOD FOR PHOTOVOLTAIC GRIDTIED-INTERLEAVED FLY-BACK MICRO-INVERTERS TO ACHIEVE HIGH EFFICIENCY IN WIDE LOAD RANGE ABSTRACT: Boundary conduction mode (BCM) and discontinuous conduction mode (DCM) control strategies are widely used for the flyback microinverter. The BCM and DCM control strategies are investigated for the interleaved flyback microinverter concentrating on the loss analysis under different load conditions. These two control strategies have different impact on the loss distribution and thus the efficiency of the flyback microinverter. For the interleaved flyback microinverter, the dominant losses with heavy load include the conduction loss of the power MOSFETs and diodes, and the loss of the transformer; while the dominant losses with light load include the gate driving loss, the turn-off loss of the power MOSFETs and the transformer core loss. Based on the loss analysis, a new hybrid control strategy combing the two-phase DCM and one-phase DCM control is proposed to improve the efficiency in wide load range by reducing the dominant losses depending on the load current. The optimal design method based on the boundary condition of the hybrid control is also presented. The experimental results verify the benefits of the proposed control.