聚光型粗细调互补阳光信号采集器的研制

Signal Acquisition Device of Concentrating Solar Rough and Fine Adjustment Complementary

高准确度自动跟踪系统是太阳能聚光器必不可少的组成部分,而信号采集器能否精确可靠地采集到阳光照射方向的信号又是自动跟踪准确度的关键.本文提出了一种粗细调互补信号采集器的设计方案,在正常工作期间通过软件能够根据需要不断地自动调整选择二组光电传感器中其中一组输出的差模信号作为有效信号,从而有效地解决了大范围寻找太阳和高准确度跟踪之间的矛盾;而在此基础上改进为对聚光后的阳光信号进行采集的新结构,又彻底解决了光电传感器本身在光照强度很大时进入饱和区与光照强度很弱时输出的差模信号太小的问题,有效延长了聚光器在早晚时段的正常工作时间.据此原理制作的聚光型粗细调互补信号采集器应用于某公司的CPV型1200W砷化镓发电系统中,取得了很好的跟踪效果,其实际跟踪误差≤0.1°(立体角).

High precision automatic tracking system is indispensable component of solar concentrator.Whether signal collector gathers the signal from sunlight direction accurately and reliably or not is the key of automatic tracking accuracy.A design scheme about signal acquisition device of rough and fine adjustment complementary was put forward.One set differential-mode signal could be automatically chosen from two sets sensors by the software during normal work.The scheme effectively resolved the contradiction between a large range looking for the sun and high accuracy tracking.A new structure of collection the signal of concentrating solar was improved,which could solve the problem of photoelectric sensor go into saturated zone in the large light intensity and the output differential-mode signal is too small when the light intensity is very weak.According to the principle,a made signal acquisition device of concentrating solar with rough and fine adjustment complementary was applied to the company′s CPV type 1200W GaAs power generation systems,and achieved very good tracking result with the actual tracking error ≤0.1°（solid angle）.