基于DSOGI锁相环的FBD谐波检测新方法

New Method of FBD Harmonic Detection Based on DSOGI Phase-Locked Loop

在有源滤波器设计中,指令电流检测与补偿是关键技术环节。在电网三相电压不对称的情况下,传统的FBD检测方法在谐波检测方面存在较大的误差。针对这个不足,笔者提出一种基于DSOGI锁相环技术的FBD新型检测算法。DSOGI锁相环技术在电压不对称和突变的情况下,能很好地锁定基波电压的相位,减少了三相不对称导致的检测误差。通过Matlab仿真测试证明,该方法与传统的FBD检测比较,具有动态速度快、检测精度高和实现简单的特点,具有很好的工程使用价值。

In active power filter design,instruction current detection and compensation is the key technology.In the case of asymmetric three-phase voltage in power grid,the traditional FBD detection method has a large error in harmonic detection.Aiming at this deficiency,a new FBD detection algorithm based on DSOGI phase-locked loop technology is proposed.Under the condition of voltage asymmetry and abrupt change,DSOGI phase-locked loop technology can lock the phase of fundamental voltage well and reduce the detection error caused by three-phase asymmetry.The simulation test by Matlab proves that this method has the characteristics of fast dynamic speed,high detection accuracy and simple implementation compared with traditional FBD detection,and has good engineering application value.