为了解户用光伏系统发电量和系统各效率衰减情况,持续跟踪、记录容量为6 kW的户用光伏系统近几年的发电量相关数据。通过理论计算和电站记录的各项数据分析发现：上海地区2015 ~ 2017年发电量逐年增加;在这三年中,组件方阵每年衰减率在4.5% ~ 6.5%之间,系统综合效率总的相对衰减不超过4%;晴天各时段方阵转换效率与系统综合效率变化趋势相同;雨天各时段逆变器效率、方阵转换效率、系统综合效率变化趋势几乎相同。
To study the attenuation of power generation and system efficiency of the household photovoltaic (PV) system, a household PV system with capacity of 6 kW was designed and installed. The data of generating capacity in 2015, 2016 and 2017 was continuously tracked and recorded. Data analysis and theoretical calculation results showed that: during this 3 years, the power generation in Shanghai increased year by year; the annual attenuation rate of the square matrix was between 4.5% and 6.5%, and the overall relative attenuation of the PV system was less than 4%; the trend of the component matrix conversion efficiency was the same as the system comprehensive efficiency in different periods of sunny days; on rainy days, the trend of dc-to-ac converter efficiency, matrix conversion efficiency and system synthesis efficiency were the same.
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