Control of Load Interfacing Power Electronics Converter in Multifrequency Systems

Abstract

The transition from the conventional electrical power distribution system to ones that incorporate more stochastic electrical sources is resulting in a need for more robust and dynamic forms of power delivery. One solution to the various issues of power balancing and control is the utilization of additional frequencies within the distribution network. By having a greater variety of operational frequencies, the resulting decoupled power flow enables the system to have a higher degree of flexibility and functionality. This paper presents a controller for load-interfacing power electronic converters that operate within a system consisting of several ac frequencies as well as a superposed dc offset. The power exchange capabilities of this multifrequency converter, such as the decoupled power transfer between different operating frequencies are analyzed and demonstrated. Likewise, the underlying control structure is easily modifiable for a wide range of frequency combinations. The resulting increased level of active and reactive power control can then be utilized by the distribution network to ensure a more enhanced and stable transition to an electrically diverse and smarter microgrid. Simulation results for several different operating points are presented.