不同支架形式的高效PERC组件发电性能

为解决目前光伏用地紧张的问题,使得电站收益最大化,需要对高效PERC(passivated emitter and rear cell)组件的发电性能和光伏支架的选型开展进一步研究。该研究基于中国电建集团华东勘测设计研究院有限公司天长一期100 MW渔光互补光伏发电项目,以天长光伏电站为试验平台,对固定式PERC方阵B1、单轴式PERC方阵B2、固定式多晶硅方阵B3和单轴式多晶硅方阵B4在2018年的发电情况进行监测,对比分析了这2种光伏组件在不同支架形式下的单瓦全年日均和单瓦单日的发电数据,验证PERC组件优越的发电性能,对比分析了不同支架形式下PERC组件的单瓦全年日均发电数据,以及在辐照度最高的7月及辐照度最低的12月的发电性能。结果表明,PERC组件全年发电性能优于多晶硅组件,在固定式和单轴式2种支架形式下的年平均发电增益分别为3.7%和5.7%,单轴PERC组件在春夏两季的发电性能均优于固定PERC组件,月均发电增益达到13.4%。PERC组件在长期工作时的优越发电性能和不同支架形式下的发电特点,可为未来光伏电站建设初期的组件和支架选取提供参考,增加电站投资收益。

Power generation performance of efficient PERC components with different bracket forms

At present, researches on generation performance of PERC (passivated emitter and rear cell) components mostly depends on theoretical calculation or short-term data measurement, lacking long-term reliable test data. Therefore, this paper, based on the Tianchang 100 MW photovoltaic power station of Huadong Engineering Corporation Limited Power China, this paper monitored the power generation of fixed-tilt PERC array B1, single-axis PERC array B2, fixed-tilt polysilicon array B3 and single-axis polysilicon array B4 in 2018 with Tianchang photovoltaic power station as the test platform. The data of DC power generation of the test array inverter in 2018 were screened and processed. By comparing the average daily energy generation per Watt and output power per Watt on September 30 in 2018, the superior power generation performance of PERC module in long-term operation was verified. Then, combined with the annual irradiance distribution map and climate characteristics of the project site, the average daily energy generation per Watt of the PERC module under the positive-south fixed tilt (inclination angle is 25°) and the north-south single-axis tracking (inclination angle is 5°) as well as the power generation performance in July with the highest irradiance and December with the lowest irradiance were analyzed. The results showed that PERC module had better power generation performance than polysilicon module in the whole year under 2 bracket forms, with an average annual power generation gain of 5.7% and 3.7%, respectively, and PERC module maintained a high output power in case of a sudden decrease in irradiance. From march to September, that was spring and summer, the average daily energy generation per Watt of the single-axis PERC module was higher, with the average monthly generation gain reaching 13.4%, and the maximum generation gain reaching 24.9% in July. But in October to February, that was the autumn and winter, the fixed-tilt PERC component performed better, with an average monthly generation gain of 8.1%. In July with the highest irradiance, the power generation gain was the largest, the generation performance of single-axis PERC was significantly better than that of fixed-tilt PERC on sunny days. In December with the lowest, the power generation gain was the lowest, the generation performance of fixed-tilt PERC in sunny days was significantly better than that of single-axis PERC. However, the radiation in rainy days is mainly diffuse reflection, with little tracking value, the power generation of PERC components under the two brackett forms was similar. The superior power generation performance of PERC module in long-term operation and the power generation characteristics under different bracket forms were in good agreement with the actual and simulated data of the same type of research, which verifiesd the reliability of experimental data. The research results can provide technical support for module selection, array selection and setting of photovoltaic power station investment and construction in future, increase the power station investment and project management benefits. In other words, the selection of modules and brackets in the initial stage of a photovoltaic power station should fully investigate the local irradiance resources and climate characteristics. If a place is rich in radiation resources and sunny days, the single-axis PERC modules can be used preferentianlly under the same investment cost.