Modular Multilevel Converter Balance with Minimum Circulating Currents

The Modular Multilevel Converter is used for a variety of applications including HVDC transport, photovoltaic generation and electric system storage among others. Its characteristic circulating currents can be employed for energy balance but they increase the losses of the converter. This paper focuses on obtaining the minimum currents that can still be used for this purpose. The optimization is made analytically, so that the numerical methods from previous publications are no longer needed. The method is tested through simulations.