Analysis of a closed loop control for current unbalance compensation based on Ac/Ac converters

In this paper a stability analysis method for unbalance compensation system based on AC-Chopper is proposed. Employing Ac-Choppers and Steinmetz theory it´s possible to obtain a dynamic compensation system. This system´s performance and stability are not depending only on the cause of unbalance but also on grid parameters such as line impedances and other connected loads. If a quasi-static sinusoidal steady-state approximation is hypothesized, through the multivariable control theory it´s possible to study the compensation system stability propriety in relation with grid parameters.