An improved active phase-shift method for islanding detection

作者：Liu Furong^*; Kang Yong; Wang Hui; Duan Shanxu; Tang Aihong

来源：Transactions of China Electrotechnical Society, 2010, 25(3): 172-176.

• Anti-islanding
• Anti-islanding protection
• Grid connected inverters
• Grid connected PV system
• Grid-connected photovoltaic system
• Islanding
• Islanding detection
• National codes
• Non detection zones
• Phase-shift method

Anti-islanding protection is a mandatory feature for grid-connected inverters. A desired method not only can detect islanding within acceptable duration, but also have less adverse impact on power quality. This paper analyzes the traditional phase-shift method for anti-islanding and proposes a new scheme which is easy to be implemented and has less adverse impact on power quality. The paper analyzes the deviation tendency of frequency in islanding and non detection zone (NDZ) of the scheme. Based on it a criterion for qualified anti-islanding is proposed, which helps to achieve grid-connected PV systems that meet the requirement of National Code.

• 出版日期2010
• 单位华中科技大学