Analysis, Design, and Control of Interlinking Dual Capacitive Filter Inverters in Microgrids

The power quality problem represented by harmonic problem seriously affects the normal operation of microgrid. In order to reduce the operation and maintenance cost of microgrid and improve the flexibility of inverters, this paper proposes an inverter topology based on multiple parallel capacitive coupling structures. Through the design parameters, a dual capacitive filter inverter (DCFI) can filter most harmonics without using additional power quality enhancement equipment. In addition, in order to make full use of the inverter capacity, an adaptive power sharing method is proposed. Through case study and simulation test, the proposed algorithm can effectively reduce the harmonic THD and optimize the capacity requirement of inverter.