一种应用于分布式光伏发电系统的低压反孤岛装置

Low Voltage Anti-Islanding Device Used in Distributed Photovoltaic Generation System

根据光伏发电的孤岛运行机理和防孤岛保护策略,设计了一种应用于分布式光伏发电系统的低压反孤岛装置。通过研究阻性、感性、容性低压反孤岛装置的设计原理,并考虑扰动负载自身特性,选择阻性负载实现装置的反孤岛功能。风险分析结果表明,阻性低压反孤岛装置不会对逆变器、低压熔断器等相关设备带来危害。通过对装置样机进行反孤岛试验,验证了低压反孤岛装置分断机理的准确性,证明装置能在要求时间内破坏分布式光伏孤岛运行的条件,实现反孤岛功能。

Based on photovoltaic technology islanding mechanism and anti-islanding protection strategy, this paper designed a low voltage anti-islanding device used in distributed photovohaie generation system. By studying the principle of three types （ resistive, inductive, capacitive） of low voltage anti-islanding device, and considering the characteristics of disturbance load. The resistive disturbance load to realize anti-islanding function was choosed. The risk analysis results show that the resistive low voltage anti-islanding device will not jeopardize the safety of inverter,low voltage fuse and other related equipments. Through anti-islanding test of the device prototype, the accuracy of low voltage anti-islanding device operational mechanism was verified, it was proved that this device can destory the distributed photovoltaie islanding condition in required time, accomplish anti-islanding function.