摘要
动态电压恢复器(dynamic voltage restorer,DVR)是改善电压质量的一种有效工具。在电网电压骤降的情况下,能否快速而准确地检测出电网电压骤降的特征量将直接影响到DVR的补偿效果。文章在研究现有的电压骤降特征量检测方法的基础上,提出一种适用于单相电压骤降的αβ求导检测算法,利用求导来代替αβ变换方法中的相位延迟算法,并且考虑了发生电压骤降过程中可能伴随的谐波的影响。仿真分析结果表明,该算法检测精度较高,实时性好,满足DVR检测的需要。
Dynamic voltage restorer （DVR） is an effective equipment to improve voltage quality. When the grid voltage sag occurs, it will directly impact on the compensation result of DVR that the characteristic quantity of power grid voltage sag could be detected rapidly and precisely or not. On the basis of researching existing detection methods of characteristic quantity of voltage sag, an αβ derivation algorithm suitable to single-phase voltage sag is proposed, in which the phase delay algorithm in αβ transform is replaced by derivation and the impact of harmonics that possibly appear during the voltage sag is taken into account. Simulation results show that the proposed algorithm possesses following advantages such as high detection precision and good real-time performance, thus it can meet the demand of DVR detection.
出处
《电网技术》
EI
CSCD
北大核心
2009年第14期52-55,61,共5页
Power System Technology
