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PV array < 5 kWp + single inverter = grid connected PV system: Are multiple inverter alternatives economic?

机译：光伏阵列<5 kWp +单个逆变器=并网光伏系统：多个逆变器替代方案是否经济？

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摘要

Compared with a single, central inverter, multiple inverter photovoltaic (PV) systems are considered to produce higher system energy yields by reducing mismatch losses within dc strings. This paper considers, from an economic viewpoint, whether multiple inverter systems can ever be justified for PV systems < 5 kWp, under the conditions that presently exist in the UK. The UK scenario being one of very high labour costs combined with both relatively low radiation levels and feed in tariffs. Analysis of a 7.2 kWp test facade configured with string and central inverters indicates that the mismatch reductions that can be achieved do not compensate for the additional capital cost of a multiple inverter installation. In addition, unless the mean time to failure of inverters approaches that of the 25 year lifetime of the dc side of the PV system, the economics of small scale grid connected PV in the UK will remain difficult, even when the cost of the PV component falls.
机译：与单个中央逆变器相比，多个逆变器光伏（PV）系统被认为可以通过减少直流串内的失配损耗来产生更高的系统能量。从经济角度出发，本文考虑了在英国目前存在的条件下，是否有理由将多个逆变器系统用于小于5 kWp的光伏系统。英国的情况是非常高的劳动力成本之一，同时辐射水平相对较低，而且关税很高。对配置有串式和中央逆变器的7.2 kWp测试立面的分析表明，可以实现的不匹配减少无法弥补多逆变器安装所产生的额外资本成本。此外，除非逆变器的平均故障时间达到光伏系统直流侧25年寿命的平均时间，否则即使在光伏组件成本较高的情况下，英国小规模并网光伏发电的经济性仍将是困难的下降。

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