Harmonic compensation method using single-phase cascaded H-bridge converters

Abstract

In this study, a cascaded single-phase converter topology is proposed for single-phase microgrid integrated into high-voltage power distribution systems. In this system, the lower single-phase converter works in voltage controlled mode to reduce the harmonic distortions of supply voltage to local critical load. At the same time, the upper single-phase converter is placed in between the main grid and the output of the lower single-phase converter. Alternatively, the upper power cell works in current controlled mode to block the harmonic current pollutions from the local non-linear load. Through collaborative control of the cascaded upper and lower converter, the proposed system can provide active harmonic filtering to both single-phase supply voltage and single-phase grid current, but without any harmonic extractions in the entire process.

Keywords

• active filters
• power supply quality
• power harmonic filters
• power grids
• power system harmonics
• voltage control
• harmonic distortion
• power convertors
• distributed power generation
• harmonic compensation method
• single-phase cascaded H-bridge converters
• single-phase microgrid
• high-voltage power distribution systems
• voltage controlled mode
• harmonic distortions
• upper single-phase converter
• upper power cell
• current controlled mode
• harmonic current pollutions
• cascaded upper converter
• lower converter
• single-phase supply voltage
• single-phase grid current
• cascaded single-phase converter topology
• H