| Abstract |
This paper presents the implementation, analysis, and comparison of discrete synchronous frame current regulators for Voltage Source Inverters (VSIs). Both a two-level inverter and a Modular Multilevel Converter were used to emphasize the universality of the studied concepts. This work focuses on direct discrete modeling and in particular coupling effects that are unique to the discrete domain. The well-studied cross-coupling of the currents in the direct quadrature (dq) frame shows different behavior in discrete time. Further, this work studies a coupling of the latched output voltages (Zero Order Hold) in the dq-frame in the Z-domain and presents a consequent method for Manipulated Input Decoupling. |
