ZPUC: A New Configuration of Single DC Source for Modular Multilevel Converter Applications

103

An efficient and cost-effective power converter is a pre-requisite for the modern power applications. With the evolvement of matured medium power self-commutated switching devices, multilevel inverters (MLIs) are emerged as a promising solution for high-power medium-voltage applications. Though, MLIs are performing a promising role in industrial applications, their high device count, size, cost and control complexity have restricted their market penetration. To address the disadvantages of MLIs, researchers are continuously contributing to new generation topologies under the name of reduced switch count (RSC) MLIs. From the past decade, numerous RSC-MLIs topologies have been reported for various applications. Therefore, this paper presents a comprehensive review and classification of RSC-MLI topologies, in terms of their structure, features, limitations, suitability and selection for specific applications..

Section: Topologies With Ladder-based Structuresmentioning

confidence: 99%

A Survey on Reduced Switch Count Multilevel Inverters

Vemuganti¹,

Sreenivasarao

Ganjikunta

et al. 2021

103

“…If the capacitor voltage is regulated at the reference value V2 * =Vdc/2, and taking advantage of the switching redundancy, an optimized output performance could be achieved by the generation of 5 equidistant voltage levels (PUC5) at the output terminals (FIGURE 7) resulting in a better flexibility in voltage levels generation (TABLE 3) and easier balancing of the capacitor voltage compared to the PUC7 configuration [39]- [45]. By adding a capacitor to the PUC5 inverter, a new topology called ZPUC5 was proposed in [46], where the output voltage waveform is unipolar.…”

Section: ) Puc Familymentioning

confidence: 99%

Review on Single-DC-Source Multilevel Inverters: Topologies, Challenges, Industrial Applications, and Recommendations

Trabelsi

Vahedi²,

Abu‐Rub

2021

Having a reduced number of switches and isolated DC sources yet generating a higher number of voltage levels has been always the challenge when selecting the appropriate Multilevel Inverter (MLI) topology. Nowadays, Single-DC-Source Multilevel Inverter (SDCS-MLI) topologies are being considered as more suitable for many power system applications such as Renewable Energy (RE) conversion systems and electrified transportations compared to the Multiple-DC-Source MLIs (MDCS-MLIs). Moreover, increasing the power rating and minimizing the switching frequency while maintaining reasonable power quality using a SDCS-MLI is an important requirement and a persistent challenge for the industry. Thus, this paper presents a general review on the available SDCS-MLI topologies and future trends. Existing solutions are discussed and analyzed based on their topologies, number of output voltage levels, number of active/passive components, advantages/limitations, maturity, and industrial applications. Furthermore, recommendations for future research and development are suggested in this paper.

“…where T s is the sampling time. Finally, by replacing (14), (15) and (16) into (11), (12) and (13), respectively, the equations for the predicted future values of the capacitor voltages as functions of the switching variables are obtained as:…”

Section: The Proposed Finite Control Set Model Predictive Contromentioning

confidence: 99%

“…A new breed of multilevel inverters, known as the packed U-Cell, is able to overcome the limitations previously mentioned. These inverters can generate a high number of voltage levels while using a smaller number of active switches and passive components [15]- [18]. In fact, some specific applications of the PUC converters have shown the ability to generate 7, 9 and even 15 voltage levels with a single DC source, isolated or generated by photovoltaic arrays [19]- [21].…”

Section: Introductionmentioning

confidence: 99%

23-level Single DC Source Hybrid PUC (H-PUC) Converter Topology With Reduced Number of Components: Real-Time Implementation With Model Predictive Control

Sorto-Ventura

Abarzadeh

Al‐Haddad

et al. 2020

Self Cite

In this paper, a new configuration of single DC source hybrid packed U-cell (H-PUC) converter with reduced number of components is proposed. The proposed H-PUC only requires one dc source, twelve power switches, and three capacitors to provide 23-level output voltage. It is comprised of two high voltage low frequency (LF) and low voltage high frequency (HF) sub-modules which leads to less power losses and higher efficiency of the proposed H-PUC converter. Moreover, a finite control set model predictive control (FCS-MPC) method is proposed to generate 23-level staircase output voltage with low THD and to regulate voltages of three capacitors to their desired values simultaneously. A real-time model of the proposed 23-level H-PUC converter and its suggested FCS-MPC are developed and implemented in OPAL-RT OP4510 platform to evaluate and validate the feasibility of the proposed H-PUC in grid-connected operation mode. The provided real-time implementation results verify and demonstrate the performance and viability of the proposed 23level H-PUC and its associated FCS-MPC to provide low THD 23-level output voltage and all three capacitors voltages balancing. INDEX TERMS grid-connected converter, hybrid PUC (H-PUC), model predictive control (MPC), multilevel inverter (MLI), packed U-cell (PUC), real-time simulation, single DC source