Details

Autor(en) / Beteiligte

• Weimin Wu
• Yunjie Sun
• Min Huang
• Xiongfei Wang
• Huai Wang
• Blaabjerg, Frede
• Liserre, Marco
• Chung, Henry Shu-hung

Titel

A Robust Passive Damping Method for LLCL-Filter-Based Grid-Tied Inverters to Minimize the Effect of Grid Harmonic Voltages

Ist Teil von

• IEEE transactions on power electronics, 2014-07, Vol.29 (7), p.3279-3289

Ort / Verlag

New York, NY: IEEE

Erscheinungsjahr

2014

Link zum Volltext

• Volltext

Quelle

IEEE Electronic Library (IEL)

Beschreibungen/Notizen

• In order to minimize the effect of the grid harmonic voltages, harmonic compensation is usually adopted for a grid-tied inverter. However, a large variation of the grid inductance challenges the system stability in case a high-order passive filter is used to connect an inverter to the grid. Although in theory, an adaptive controller can solve this problem, but in such a case the grid inductance may need to be detected online, which will complicate the control system. This paper investigates the relationship between the maximum gain of the controller that still keeps the system stable and the Q-factor for a grid-tied inverter with an RL series or an RC parallel damped high-order power filter. Then, a robust passive damping method for LLCL-filter-based grid-tied inverters is proposed, which effectively can suppress the possible resonances even if the grid inductance varies in a wide range. Simulation and experimental results are in good agreement with the theoretical analysis.