Experimental study of a multicell ac/ac converter balancing circuit

The paper presents the experimental study of the balancing process forced by passive RLC circuit in a multicell AC/AC converter. To ensure its proper operation the converter employs voltages over the capacitors within its internal topology. Appropriate charging and reversing charge of cellspsila capacitors is achieved by means of the passive balancing circuit - a series RLC circuit connected at the converter output. The main issue is the correct choice of the balancing circuit wave impedance and the converter parameters (switching frequency, capacitances of cells capacitors) that allows maintaining a correct shape and proportion of voltages across cells capacitors at minimum balancing current.