Abstract
Modular and cascaded multilevel converters provide a functional solution for the integration of energy storage systems (ESSs). This paper develops a hybrid multilevel converter based on the modular multilevel converter (MMC) that can be functionally extended with partial embedded ESS as a fraction of the overall converter power rating. The configuration, which can operate as a typical DC-AC converter, enables multi-directional power flow between the DC- and AC-side of the converter, as well as the embedded energy storage elements. The use of a three-phase flying-capacitor submodule eliminates the second-order harmonic oscillations present in modular cascaded multilevel converters. Current, voltage and power control are discussed in the paper while simulation results illustrate the operation of the hybrid MMC as a DC-AC converter in a typical inverter application and the additional functions and control of the embedded ESS.
Highlights
The large growth in grid-connected renewable energy resources, experienced globally, has added to the existing challenges of maintaining a reliable and efficient electricity network
This paper proposed an hybrid modular multilevel converter (HMMC) as a combination of a three-phase flying capacitor (FC)-SM with single-phase half-bridge SMs (HB-SM)
The main advantages of the proposed HMMC are the elimination of low-frequency voltage ripple in the capacitors of the FC-SM without introducing any further complexity into the circuit
Summary
Georgios Konstantinou 1, *, Josep Pou 2 , Daniel Pagano 3 and Salvador Ceballos 4.
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