Novel hysteresis controller based on a rotating coordinate system with direct d and q constraint

With increasing decentralized power supply within the grids and a constantly growing number of active front end inverters (AFE) being connected to the grid there is a high demand on reactive power feeding to the grid. Actual Control processes, especially hysteresis controller, do not allow a direct active and reactive control without special transformations [1]. Especially the well-known space vector hysteresis control based on α-and β-Coordinates does not allow a divergent hysteresis for the active and reactive component. Furthermore there are further disadvantages in comparison to the new controller being evaluated. With the use of a Permanent magnet excited Synchronous machine (PMSM) this d-q-controller offers a precise control and a reduction of power loss within the inverter. This by the way means a lower temperature rise within the inverter. This Paper describes the functionality of the new floating d-qhysteresis controller and shows a comparison with the mentioned α-and β-control-structure.