根据测量的电流-电压曲线,分析PV串在最接近标称MPP电压的MPP处的运行情况,而不是在全局MPP处

IF 1.9 Q3 PHYSICS, APPLIED EPJ Photovoltaics Pub Date : 2022-01-01 DOI:10.1051/epjpv/2022001
K. Lappalainen, S. Valkealahti
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引用次数: 3

摘要

在非均匀工况下,光伏发电机组可能有多个最大功率点(MPP),全局最大功率点(GMPP)的电压可能在较宽的电压范围内变化很快,这可能会给GMPP的跟踪带来问题。由于GMPP电压的剧烈变化会引起逆变器参考电压的波动,因此将逆变器的工作点始终保持在标称MPP电压附近,有利于光伏系统的运行更加可预测和直接。本文提出了一种实验研究方案,其中最接近MPP标称电压(CMPP)的MPP始终是工作点,而不是GMPP。该分析基于位于芬兰坦佩雷的三个不同PV串的1,296,000个测量的电流-电压曲线,对每个研究串(包括6个,17个和23个串联的nap NP190GK光伏模块)进行了12天的全职测量分析。此外,还研究了逆变器尺寸对串工作点行为的影响。结果表明,在CMPP下工作可以显著减小GMPP的宽工作电压范围,而能量损失可以忽略不计。由于停电造成的能量损失远远大于在CMPP而不是GMPP运行所造成的能量损失。
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Analysis of the operation of PV strings at the MPP closest to the nominal MPP voltage instead of the global MPP based on measured current–voltage curves
Under non-uniform operating conditions, photovoltaic (PV) generators may have several maximum power points (MPP) and voltage of the global MPP (GMPP) may vary quickly over a wide voltage range which may cause problems for tracking of the GMPP. Since highly varying GMPP voltage causes fluctuation of the inverter reference voltage, it would be beneficial to operate the PV system in a more predictable and straightforward manner by keeping the operating point of the inverter all the time close to the nominal MPP voltage. This article presents an experimental study of a scenario in which the MPP closest to the nominal MPP voltage (CMPP) is always the operating point instead of the GMPP. The analysis was based on 1,296,000 measured current–voltage curves of three different PV strings located at Tampere, Finland. 12 days of full-time measurements were analysed for each of the studied strings consisting of 6, 17 and 23 series-connected NAPS NP190GK PV modules. Furthermore, the effects of inverter sizing on the operating point behaviour of the strings were studied. The results show that the wide operating voltage range of the GMPP can be significantly reduced by operating at the CMPP at a cost of negligible energy losses. Energy losses due to power curtailment were much larger than energy losses due to operation at the CMPP instead of the GMPP.
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来源期刊
EPJ Photovoltaics
EPJ Photovoltaics PHYSICS, APPLIED-
CiteScore
2.30
自引率
4.00%
发文量
15
审稿时长
8 weeks
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