Photovoltaic power conversion with efficiency weight optimisation

IEEE International Conference on Industrial Technology, 2003 Pub Date : 2003-12-10 DOI:10.1109/ICIT.2003.1290829

E. Winfried, H. Weiss

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引用次数: 4

Abstract

Photovoltaic power conversion systems for power rating of about 2.5 kW consist generally of a step-up converter, a DC-AC inverter for 5 Hz and the transformer coupling to the grid. Potential separation is required between the modules and grid. A standard 5 Hz transformer can accomplish this separation. Heavy in weight, loud in noises and exhibiting high temperatures through the transformer make the whole system large in volume and expensive. By discussing optimisation facts, new ideas in the conversion structure have been found in a two-inverter conversion concept and will be evaluated in this synopsis. The main idea of this new concept is to make the necessary separation also with a transformer but with a ferrite core and an operating frequency of 2 kHz. Optimised for these 2 kHz the above-mentioned problematic facts will be minimised. The first converter is used for the DC-AC conversion to the base of 2 kHz. The second inverter, supplied after the transformer and a stabilised rectifying system, makes the DC-AC conversion to the 5 Hz grid. Further on, component costs will be reduced through using the same kind of inverter. Also the control management is more modular and effective.

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光电转换效率重量优化

额定功率约为2.5 kW的光伏电源转换系统通常由升压转换器、5 Hz的DC-AC逆变器和与电网耦合的变压器组成。模块和网格之间需要潜在的分离。一个标准的5hz变压器可以实现这种分离。由于变压器重量大、噪音大、温度高，使得整个系统体积大、价格昂贵。通过讨论优化事实，在双逆变器转换概念中发现了转换结构的新思路，并将在本概要中进行评估。这个新概念的主要思想是使必要的分离也与变压器，但铁氧体核心和工作频率为2khz。优化这些2千赫上述有问题的事实将被最小化。第一个转换器用于将DC-AC转换为2 kHz的基极。第二个逆变器，在变压器和稳定整流系统之后供电，使直流-交流转换到5hz电网。此外，通过使用同类逆变器，将降低组件成本。控制管理也更加模块化和有效。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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IEEE International Conference on Industrial Technology, 2003

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