摘要
光伏并网逆变器必须具备孤岛检测功能,而传统的孤岛检测法存在检测盲区。文中首先采用品质因数/谐振频率平面法对基于相位偏移的孤岛检测法的检测盲区进行分析。在此基础上,提出了一种基于相位偏移的自抗扰孤岛检测法,该方法通过引入频率控制函数,一方面能够有效地防止系统扰动造成的误判,另一方面有效的减小了检测盲区。此外,文中还给出了自抗扰孤岛孤岛检测法参数选取方案。最后,通过数值仿真验证了不同负载状况下该孤岛检测方法的有效性。
Unintentional islanding phenomenon has been one of the most important problems of photovohaic grid- connected converters. However, non-detection zone possibilities exist in the traditional phase shift islanding detection methods for paralleled RLC loads. This paper presents an active islanding detection method for grid- connected converters, which is based on the phase shift of the sinusoidal converter output current. The proposed active disturbance rejection islanding detection method can eliminate non-detection zone by introducing a function to break possible stable state operating point even in the worst condition. Meanwhile a methodology to design its parameters is also presented. The ability of the proposed method to achieve the effective detection capability is proved by means of simulation.
出处
《高压电器》
CAS
CSCD
北大核心
2015年第10期13-18,23,共7页
High Voltage Apparatus
关键词
并网逆变器
主动式孤岛检测法
相位偏移
自抗扰
检测盲区
grid-connected converters
active islanding detection method
phase shift
active disturbance rejection
non-detection zone
