An Active Filter with Low-Frequency Ripple Reduction for Single-Phase Grid-Connected System

• Main Authors: Quan-Sheng Lin, 林詮盛
• Other Authors: 賴慶明
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/jrw852

碩士 === 國立臺北科技大學 === 車輛工程系 === 106 === The objective of this dissertation is to propose a new control strategy for the active filter. It controls the output current of the distributed energy devices for simplifying the control loop design of the active filter, and therefore the output current of the filter can be adjustable indirectly. The proposed control strategy can be used to reduce the instantaneous power phenomenon with double line frequency of the single-phase DC/AC conversion system. Thus, the low output ripple and long-life cycle characteristics of distributed energy devices can be achieved. This dissertation covers the root causes of the double line-frequency ripple and how to reduce that with the proposed active filter. Besides, the circuit simulation, steady-state analysis, small-signal model derivation, control loop design, and hardware implementation are made. Finally, the proposed active filter is built for single-phase grid-connected system with input voltage of 36V and output AC voltage of 110Vrms / output rated power of 500W. According to the simulation results and experimental verifications for the proposed active filter, the low ripple characteristics of the DC side for the single-phase grid-connected system can be achieved.