A Three-level Neutral-Point Clamped Dual-Output Converter

Abstract

This paper introduces a novel three-level dualoutput neutral-point clamped converter. The proposed topology has both the advantages of a reduced power component count and complete independent control of its outputs. The converter is operated using Finite-Control-Set Model Predictive Control (FCS-MPC). The mathematical model of the proposed converter is developed and is used in the FCS-MPC algorithm to realize the desired output currents and balance the neutral point voltage. The operation of the proposed topology is verified by comparing simulation and experimental results. Moreover, a comparison with the flying capacitor based dual-output converter, in terms of the total harmonic distortion and the average device switching frequency, is presented.

Multivariable control of multilevel converters in microgrid

“…In [57], a neutral-point clamped dual-output (NPDO) converter is reported. Unlike the above mentioned multi-output NPC topologies [47][48][49][50][51][52], the NPDO converter operates its output ports independently at different amplitudes, frequencies, and phase angles.…”

“…Compared to [47][48][49][50][51][52], the NPDO converter and the FCDO converter have additional power switches. Even though additional components are added, these fully independent MOM converters [57,58] require less number of power switches and passive components compared to the scenario where multiple units of singleoutput multilevel converters are used. To have a better understanding, a simple hybrid microgrid with two dissimilar ac systems (i.e., variable speed motor and grid) is considered, as shown in Figure 2.3.…”

“…As discussed in Section 2.1.2 and quantitative summary presented in Table 2.1, a fully independent MOM converter such as the NPDO converter [57] and FCDO converter [58] easily integrated dissimilar ac sources and loads through its output ports in a hybrid microgrid at reduced number of components and control variables.…”