2017美国光伏标准《组件级自我关断解决方案》.pptx

Module-level automatic shutdown solutions组件级自我关断解决方案The proposed 2017 NEC 690.12 may require a shutdown mechanism　at module level to improve system safety 美国NEC2017 690.12建议光伏系统具备组件级别关断的能力，以提供最　 好的系统安全性. 我们组件级关断的解决方案具有 (1) Module-level automatic shutdown 组件级自动关断能力 (2) Module-level automatic shutdown solution can protect modules/junction boxes from irreversible damages caused by hotspot-induced over-heating and fire 阻止由于热斑或接线盒接线电阻过大带来的发热，导致组件和接线盒不可逆破坏 (3) Minimizes mismatch power losses caused by a temperature gap between cells, thanks to a unique junction box design and a patented radiation technology 拥有专利的单向散热接线盒设计可以减少电池串温差带来的失配功率损失。 (4) integrated with junction box and no extral 集成到接线盒中，不需要其他设备Safety is always the top priority for any PV installationCurrent safety requirements in 2014 edition of NEC 690.12 2014 版美国国家电工规范690.12 规定The current code requires a 3-meter keep-out zone, commonly know as the “10-foot Rule” (see illustration), between all PV architectures and technologies; and a PV system should be able to reduce its voltages to less than 30v within 10 seconds美国国家电工规范 2014 版690.12 规定所有光伏技术和系统都应该保持一个3米的空旷空间这个光伏系统电压需要在10秒钟内下降到30V 以下Commonly used fast shutdown solutions in compliance with NEC 2014 690.12目前常用的符合２０１４版规范系统快速关断解决方案Right now, most residential PV systems use micro-inverters and AC modules, DC-to-DC converters, or string inverters:(1) Micro-inverters and AC modules: A loss of AC power immediately de-energizes all PV system circuits outside the array area(s); only the inside of the circuits and external micro-inverters remain energized　 (关断交流开关后，将立刻导致光伏阵列外区域断电，只有微逆到组件的内部保持有电)DC-to-DC converters: They can control voltage at the array, meeting the requirement for rapid shutdown; but they are only compliant with 2014 NEC 690.12 if they can meet the 10-second time limit, which is largely depending on inverter function ( DC-to-DC 优化器可以控制组件串电压，满足快速关断的要求。但只有满足10秒关断的条件才满足NEC 2014 690.12 的要求，这取决于组串逆变器的能力）(3) String inverter systems: To be compliant with