A control scheme design for a back-to-back converter in microgrid systems Conference Paper uri icon


  • In this paper the modeling and control design for a back-to-back power converter to improve the power quality in microgrid systems are presented. The selected topology is based on the single phase double-boost as a rectifier interfaced with the well-known H-bridge power converter which acts as an inverter. The proposed topology is a linkage between two AC grids with different or equal fundamental frequencies delivering power in an unidirectional way. Both converters have a common DC-Link which is used to store the energy to be transferred from one side to another between the grids. Then the main idea is to transfer active power from the first grid to the second AC grid. The proposed control law consists of three loops which are referred as the rectifier-side current control loop, a the inverter-side current control loop and the DC-Link voltage regulation loop. The first is designed as a proportional controller plus a bank of resonant filters aimed to mitigate the harmonic content present on the rectifier-side current. The second control loop is composed by a proportional plus a resonant controller which delivers a sinusoidal current in phase with the grid voltage. The voltage regulation loop is able to regulate the common DC-Link voltage for both converters in such a way that it maintains a desired value despite of power reference step up and step down changes. This control loop consists of a proportional plus integral controller whose output signal acts as a modulating signal for the rectifier side current reference. In order to evaluate the performance of the controller, numerical simulations are performed. © 2019 IEEE.

publication date

  • 2019-01-01