Real-time Detection Of Harmonics Over Power Line

With the development of power electronics technology, lots of nonlinear load appears in power supply system which injects harmonics into power line so that the electric energy quality and power supply safety are heavily affected. APF (Active power Filter) is the optimal solution to harmonics, which is achieved through detecting the harmonics and idle current, then making compensation and exerting suppression control.The research on APF has been mature at abroad, however which on the whole is still at the stage of theory and laboratory research with less applications in engineering at home. The crucial part in APF system is the detection of harmonics and idle current, and how to detect harmonics accurately under real time is the premise of implementing precise compensation control and is also the needed-to-solve problem of APF application technology. In this thesis, an effective scheme is proposed after making discussion, combined the research technology status at home and abroad, on various kinds of detecting methods of harmonics and idle current. The hardware structure is divided into two parts—signal detection and control.The crucial part in APF system is the detection of harmonics and idle current, and how to detect harmonics accurately under real time is the premise of implementing precise compensation control and is also the needed-to-solve problem of APF application technology. In this thesis, an effective scheme is proposed after making discussion, combined the research technology status at home and abroad, on various kinds of detecting methods of harmonics and idle current. The hardware structure is divided into two parts—signal detection and control.