首页> 外文会议>Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition >Photovoltaic AC parameter characterization for dynamic partial shading and hot spot detection
【24h】

Photovoltaic AC parameter characterization for dynamic partial shading and hot spot detection

机译:用于动态局部阴影和热点检测的光伏交流参数表征

获取原文
获取原文并翻译 | 示例

摘要

This study investigates ac parameter characterization to detect partial shading within a series string of photovoltaic (PV) cells. Partial shading detection is needed to prevent hot spotting, a condition that reduces panel power performance and accelerates cell degradation. A PV cell is comprised of series and parallel resistances and parallel capacitance, which are affected by voltage bias, illumination, and temperature. When the string is under a maximum power point tracker or constant voltage controller, partial shading results in a clear increase in capacitance that is detectable by measuring the ac impedance magnitude in the 10–70 kHz frequency range. When the shaded cells become moderately negatively biased, there is a clear increase in parallel resistance. These trends in the PV cell physical characteristics can be used to develop partial shading detection methods that utilize the switching ripple of the power converter that controls the PV string.
机译:这项研究调查了交流参数表征,以检测一系列光伏(PV)电池串中的部分阴影。需要部分阴影检测以防止热点,这种情况会降低面板电源性能并加速电池性能下降。 PV电池由串联和并联电阻以及并联电容组成,这些串联和并联电阻以及并联电容会受到电压偏置,照度和温度的影响。当灯串在最大功率点跟踪器或恒定电压控制器下时,部分阴影会导致电容明显增加,这可以通过测量10–70 kHz频率范围内的交流阻抗幅度来检测。当阴影单元变为中等程度的负偏置时,并联电阻会明显增加。 PV电池物理特性的这些趋势可用于开发部分阴影检测方法,该方法利用控制PV串的功率转换器的开关纹波。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号