Balancing of State Of Charge Batteries in a Three Phase Diode Clamped Inverter Controlled By a Direct Space Vector of Line to Line Voltages

The development of hybrid and electric vehicles in recent years has increased the use of batteries. However The failure of one cell of the battery involves the nonavailability of the embedded battery. To resolve this problem, one can use modular battery associated with specific converter. This method allows the system functioning in the case of cells failure. In this article, a strategy to control a five-level diode inverter associated with a storage system (four batteries modules) is presented. The equation formulation for this control method is based on the combination of different conversion functions. This control makes it possible to determine the modulation for each voltage reference vector of this strategy and its position in the voltage modulation plane in an easy way because this spatial vector modulation does not use the park transform. In order to ensure the state of charge (SOC) balancing between the four battery modules we use the different redundant vectors with closed-loop control. Simulation results demonstrate the good performance of the proposed system.