基于最优控制的快速光伏并网孤岛检测研究  

Research of fast islanding detect method for grid-connected PV generation system based on optimal control

作　　者：龚会茹 易灵芝[2] 沈建飞[2] 潘元勇 夏小芳[2] 

机构地区：[1]新乡市质量技术监督检验测试中心,河南新乡453000 [2]湘潭大学信息工程学院,湖南湘潭411105 [3]新乡市市政设计研究院,河南新乡453000

出　　处：《电源技术》2014年第4期694-696,740,共4页Chinese Journal of Power Sources

基　　金：国家自然科学基金(50977080);教育部教育研究课题(2009-ZX-052);湖南省科技厅项目(2010FJ3116);湖南省教育厅重点项目(10A114);湖南省大学生研究性学习和创新性实验计划项目资助

摘　　要：光伏并网系统中产生孤岛时,不仅对设备造成破坏,而且危及维修人员的安全。传统的被动检测方法在逆变器所带的本地负荷与其输出功率接近于匹配时失效,主动检测法添加的扰动又会降低系统稳定性和减慢检测的速度,直接影响并网电能质量。针对上述问题,提出一种基于最优控制的快速孤岛检测方法,通过对逆变器端输出电压的幅值、相位和频率的变化差值建立数学模型,采用二次型最优控制算法进行孤岛检测。通过理论分析、建模和仿真研究,验证了该方法的可行性,检测时间短,具有一定的工程应用价值。When island occurs in photovoltaic （PV） grid-connected system, not only equipment is damaged, but also the life safety of people was endangered. The traditional passive detection method in the inverter with local load and output power close to matching fails, and active detection method to add perturbations will reduce the stability of the system and slow down the speed of detection, direct effects of grid power quality. Aiming at these problems, a kind of optimal control method for islanding detection was put forward. Based on the changes of inverter output voltage amplitude, frequency and phase difference, a mathematical model was built, using two quadratic optimal control algorithms for islanding detection. Through theoretical analysis, modeling and simulation, the feasibility of the method is verified with short testing time and a certain application value.

关 键 词：光伏系统 孤岛 被动检测 主动检测 最优控制 

分 类 号：TM914[电气工程—电力电子与电力传动]