A novel grid-connected PV PCS with new high efficiency converter

2007 7th Internatonal Conference on Power Electronics Pub Date : 2007-10-01 DOI:10.1109/ICPE.2007.4692433

B. Min, J. Lee, Jong-Hyun Kim, Tae-Jin Kim, D. Yoo, Kang Ryoul Ryu, Jung Joong Kim, E. Song

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引用次数: 42

Abstract

In this paper, new topology is proposed that can dramatically reduce the converter power rating and increase the efficiency of total PV system. Since the output voltage of PV module has very wide voltage range, in general, the DC/DC converter is used to get constant high DC voltage. According to analysis of PV characteristics, in proposed topology, only 20% power of total PV system power is needed for DC/DC converter. DC/DC converter used in proposed topology has flat efficiency curve at all load range and very high efficiency characteristics. The total system efficiency is the product of that of converter and that of inverter. In proposed topology, because the converter efficiency curve is flat all load range, the total system efficiency at the low power range is dramatically improved. The proposed topology is implemented for 200 kW PCS system. This system has only three DC/DC converters with 20 kW power rating each other. It is only one-third of total system power. The experiment results show that the proposed topology has good performance.

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一种新型高效变换器并网光伏PCS

本文提出了一种新的拓扑结构，可以显著降低变流器额定功率，提高整个光伏系统的效率。由于光伏组件的输出电压范围非常宽，一般采用DC/DC变换器来获得恒定的高直流电压。根据光伏特性分析，在所提出的拓扑结构中，DC/DC变换器只需要光伏系统总功率的20%。采用该拓扑结构的DC/DC变换器在所有负载范围内具有平坦的效率曲线和非常高的效率特性。系统总效率是变换器效率和逆变器效率的乘积。在该拓扑中，由于变换器的效率曲线在所有负载范围内都是平坦的，因此在低功率范围内，系统的总效率得到了显著提高。该拓扑在200kw PCS系统中实现。该系统只有三个DC/DC转换器，彼此额定功率为20千瓦。它仅占系统总功率的三分之一。实验结果表明，该拓扑具有良好的性能。

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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2007 7th Internatonal Conference on Power Electronics

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