A New Strategy For Resonance Suppression in LCC-HVDC System

Non-characteristic harmonic resonance has been observed in several LCC-HVDC stations in China in recent years. This paper investigates the possibility of mitigating harmonic resonance in high voltage systems, given the increasing popularity of power electronic devices such as STAT-COM. It focuses on utilizing active filtering technology. This paper proposes a novel control strategy, called virtual impedance control, which aims to minimize the output impedance of the active filter while ensuring it is not overloaded. A control design of frequency division is also provided to improve the efficiency of Active Power Filter (APF).