摘要
同步信号的快速准确检测是对三相并网逆变器控制的前提条件。近年来,锁频环和同步信号检测技术得到越来越多的关注。对二阶广义积分器(SOGI-PLL)进行改进,采用降阶的广义积分器锁频环(ROGI-FLL),并加入直流分量反馈环节。在电网故障和直流偏置的情况下,能快速提取电压正、负序分量,并实现对系统频率的快速准确跟踪。且控制结构简单,易于数字实现。最后,实验结果验证了该方法的有效性。
In the synchronous signal extraction, direct current component in the three-phase may be introduced due to voltage temporary system fault or voltage measurement part or signal processing, which affect the synchronization signal extraction.The reduced order generalized integrator-frequency locked loop （ROGI-FLL） adding the feedback DC component on the base of the second order generalized integrator phase locked Ioop（SOGI-PLL） is proposed, which is able to extract of positive sequence and negative sequence components and track the frequency of the grid voltage rapidly under the condition of voltage distortion,direct current offset and so on.Finally,experimental results confirm the feasibility and effectiveness of proposed method.
出处
《电力电子技术》
CSCD
北大核心
2017年第2期22-25,共4页
Power Electronics
基金
国家自然科学基金(51277024)~~
关键词
逆变器
同步信号
锁频环
inverter
synchronization signal
frequency locked loop
