Power Loss Comparison of Single- and Two-Stage Grid-Connected Photovoltaic Systems
Power Loss Comparison of Single- and Two-Stage Grid-Connected Photovoltaic Systems
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DOI：
10.1109/tec.2011.2123897
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发表时间：
2011-04
影响因子：
4.9
通讯作者：
Tsai-Fu Wu;Chih Chang;L. Lin;C. Kuo
中科院分区：
文献类型：
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作者：
Tsai-Fu Wu;Chih Chang;L. Lin;C. Kuo
本文基于双工频电压纹波 (DLFVR)、快速辐照度变化 + DLFVR、快速直流负载变化 + DLFVR、有限工作电压范围 + DLFVR 以及总体损耗因数组合，对单级和两级并网光伏 (PV) 系统的功率损耗进行了比较。这些损耗因素将导致功率偏离最大功率点。本文同时考虑单级和两级并网光伏系统。由于额外的最大功率点跟踪器，对两级系统的所有影响都是微不足道的，但跟踪器通常会降低系统效率约 2.5%。这些损耗因素造成的单级并网光伏系统的功率损耗也在2.5%左右；也就是说，单级系统具有节省元件和降低成本的优点，并且在某些工作电压范围下不会损害整体系统效率。 MATLAB软件包的仿真结果和实验结果证实了分析结果。
This paper presents power loss comparison of single- and two-stage grid-connected photovoltaic (PV) systems based on the loss factors of double line-frequency voltage ripple (DLFVR), fast irradiance variation + DLFVR, fast dc load variation + DLFVR, limited operating voltage range + DLFVR, and overall loss factor combination. These loss factors will result in power deviation from the maximum power points. In this paper, both single-stage and two-stage grid-connected PV systems are considered. All of the effects on a two-stage system are insignificant due to an additional maximum power point tracker, but the tracker will reduce the system efficiency typically about 2.5%. The power loss caused by these loss factors in a single-stage grid-connected PV system is also around 2.5%; that is, a single-stage system has the merits of saving components and reducing cost, and does not penalize overall system efficiency under certain operating voltage ranges. Simulation results with the MATLAB software package and experimental results have confirmed the analysis.