Optimised inverter sizing for photovoltaic systems in high-latitude maritime climates

Optimised inverter sizing for photovoltaic systems in high-latitude maritime climates
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针对高纬度海洋气候下光伏系统优化逆变器尺寸

DOI:
10.1049/iet-rpg.2009.0162
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发表时间:
2011
影响因子:
2.6
通讯作者:
Zhu J
Zhu J
中科院分区:
工程技术4区
文献类型:
--
作者:
Zhu J

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逆变器的尺寸通常根据指南确定。这些没有考虑英国海洋气候的具体情况,即与大陆气候相比,漫射辐照度高、锋面移动快、季节间模块工作温度变化较小。现有的英国指南被证明不是最理想的。提出了更合适的尺寸调整方法。首先考虑的影响是采样率。结果表明,每小时模型中的高辐照度被低估,导致逆变器尺寸出现显着偏差。建议使用时间分辨率高于 10 分钟的数据集,以避免将来出现这种影响。模块工作温度的变化会影响系统获得的直流电压。结果表明,在选型时忽略这一点可能会导致年产量减少几个百分点。所提出的模型考虑了逆变器效率的电压依赖性,该效率受直流电压的温度引起的变化的影响。对不同的逆变器进行了评估,结果表明不能给出一般的经验法则,因为尺寸很大程度上取决于逆变器的详细特性。
Inverters are typically sized based on guidelines. These do not consider the specifics of a maritime climate as seen in the UK, i.e. a high percentage of diffuse irradiance, fast moving weather fronts and a smaller variation in inter-seasonal module operating temperatures compared to continental climates. The existing UK-guidelines are shown to be sub-optimal. A more appropriate sizing methodology is presented. The first influence considered is the sampling rate. It is shown that high irradiances are underestimated in hourly models, resulting in a significant skewing in the inverter sizing. The use of datasets with time resolutions higher than 10 minutes is recommended to avoid this effect in the future. Variations of module operating temperature influence the DC voltages achieved by systems. It is shown that neglecting this in the sizing might result in several percent reduced annual output. The presented model considers the voltage dependence of the inverter efficiency which is affected by the temperature induced variation of the DC voltage. Different inverters are assessed and it is shown that no general rule of thumb can be given as the sizing depends strongly on the detailed inverter characteristics.
DOI: --
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