Stability Analysis and Resonance Damping of LC Filter-Based Voltage Source Converter With Single-Loop Voltage Control

This paper presents a lead compensator-based voltage control and resonance damping of a single-loop LC filter-based Voltage Source Inverter (VSI). Passive damping approaches lead to additional losses in the system; hence active methods to damp the filter resonances are widely utilized. Active methods either need additional current sensors or current estimator. In this paper, the effect of an undamped LC resonance on the system transfer functions is discussed and a lead compensator-based control system is designed to improve the system stability, thereby consequently damping the resonance in the output impedance transfer function as well. A detailed mathematical analysis is provided along with simulation and experimental results to validate the concept.