Control and implementation of back to back grid converters utilizing IEEE 519

Abstract

This work presents a back to back converter topology with the ability to connect two power systems of different voltages and frequencies for the exchange of power. By utilizing indirect AC to AC conversion decoupling is achieved between the power systems with one of three phase, two level voltage source converters performing the AC to DC conversion that maintains the required DC bus voltage level at unity power factor while the other converter operates in all four quadrants supplying and or consuming active and or reactive power with the other power system. The prototype implementation resides at University of Wisconsin Milwaukee's USR building microgrid test bed facility with an emphasis in the design to approach the requirements for harmonic control as recommended by IEEE 519 without power filtering AC capacitors.