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A Preliminary Study on the Performance ofDaylight Responsive Dimming Systems withImproved Closed-Loop Control Algorithm

机译：改进的闭环控制算法对日光响应调光系统性能的初步研究

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Abstract—Daylight responsive dimming systems continuously adjustnelectric lighting output with an algorithm to maintain target illuminancenlevels at the workplane in combination with available daylight. A keynfactor of closed-loop proportional control algorithms is the ratio ofnphotosensor response to daylight illuminance at the workplane. Thisnratio determines in part the control slope (M) between dimming levelnand lighting output. Although this ratio is known to vary significantlynwith sun and sky conditions, it is typically set to a fixed value at thentime of calibration. Such practice adversely affects the accuracy andntherefore reliability of these systems.nTo investigate how to improve performance, a solstice-to-solsticenexperiment was conducted in a conventional private office mockup withna large-area, south-facing window and a fixed height roller shadenpositioned to block direct sun for most hours of the year. This simplenpreliminary case was used to explore and define the methods fornderivation of improved control algorithms with the intent of studyingnmore complex cases in future work. First, variations in the ratio ofnphotosensor signal to daylight workplane illuminance were analyzednusing a divided time period, clearness index (KnTn) ratio, and the ratio ofndiffuse solar irradiance to global solar irradiance on an exteriornhorizontal surface ( Indn/InTn). Second, an improved closed-loop proportionalncontrol algorithm was suggested based on least square fits to thenexperimental data assuming that commissioning would occur atntargeted times. The performance of this improved algorithm wascompared to a modified conventional control algorithm and found tondeliver more reliable, accurate performance when commissioning wasnperformed on two targeted days within the solstice-to-solstice period.nFor the improved control algorithm when calibrations were performednbased on day of the year (June/ December), the measured workplanenilluminance levels did not fall below 90 percent of the design level forn98.4 percent of the test period. For improved control algorithm whenncalibrations were performed based on sky conditions (Indn/InTnratio fornclear and overcast), the measured workplane illuminance levels did notnfall below 90 percent of the design level for 99.5 percent of the testnperiod. This study indicates that improvements to the dimming controlnalgorithm and commissioning practices can improve system accuracynand may increase market adoption of the daylight responsive dimmingnsystems.
机译：摘要—日光响应调光系统结合可用日光，通过一种算法来连续调节电照明输出，以维持工作平面上的目标照度水平。闭环比例控制算法的关键因素是光电传感器响应与工作平面上日照度的比率。该比率部分确定调光水平与照明输出之间的控制斜率（M）。尽管已知该比率随太阳和天空条件而显着变化，但通常在校准时将其设置为固定值。这种做法会对这些系统的准确性和因此的可靠性产生不利影响。n为了研究如何提高性能，在一个传统的私人办公室模型中进行了一个冬至冬的实验，该模型具有大面积，朝南的窗口和固定高度的卷帘，以遮挡住一年中大部分时间都直射阳光。这个简单的案例被用来探索和定义改进控制算法的推导方法，目的是在以后的工作中研究更多的复杂案例。首先，使用划分的时间段，净度指数（KnTn）比率以及水平外表面上n漫射太阳辐照度与整体太阳辐照度的比率（Indn / InTn）分析了n光电传感器信号与日光工作面照度的比率的变化。其次，提出了一种改进的闭环比例控制算法，该算法基于最小二乘拟合，然后假定实验将在目标时间发生，然后对实验数据进行拟合。改进后的算法的性能与改进后的传统控制算法相比，发现在冬至期间的两个目标日期进行调试时，tonton交付的性能更加可靠，准确。n对于基于基准日的校准，改进后的控制算法一年（6月/ 12月），测得的工作平面照度水平在测试期间的98.4％内未低于设计水平的90％。对于基于天空条件（Indn / InTnratio晴天和阴天）进行校准时的改进控制算法，在99.5％的测试期间内，测得的工作平面照度水平不会低于设计水平的90％。这项研究表明，对调光控制算法和调试实践的改进可以提高系统精度，并可以提高日光响应调光系统的市场采用率。

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