A comparative analysis of classical three phase multilevel (five level) inverter topologies

Prayag, Aparna; Bodkhe, Sanjay

doi:10.1109/icpeices.2016.7853567

Cited by 25 publications

(8 citation statements)

References 22 publications

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“…In the last few decades, multilevel inverters became an appealing choice for electrical engineers in high power industrial AC applications due to its superior flexibility in output voltage and frequency, reduced filter requirements, lower dv/dt and lower switching losses with higher quality voltage and current waveforms than the standard two-level inverter [1].Various topologies have been proposed by researchers throughout the years appropriate for different applications such as photovoltaic systems, flexible AC transmission systems (FACTS) devices, drive systems, etc [2]. Three types of these topologies were considered as conventional topologies which are cascade H-bridge (CHB) MLI, neutral point clamped (NPC) MLI and flying capacitors (FC) MLI [3], [4]. These topologies were commercialized and used in different industrial and power system applications, and it created a challenging race to invent new topologies and control schemes and to implement the most advanced control strategies in MLI to produce ultimate inverters for specific applications [5].…”

Section: Introductionmentioning

confidence: 99%

Active voltage balancing strategy of asymmetric stacked multilevel inverter

Kasim

Hassan

2021

IJEECS

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Multilevel inverters (MLI) play an important role in AC applications and are undergoing continuous development in topology and control. In higher levels inverters, conventional MLIs have high components count which calls for modification of these topologies to obtain the same number of levels with fewer components to reduce cost and size. Balancing of the capacitors voltages is crucial for the operation of the MLI and it becomes more challenging in higher levels. This paper presents an active voltage balancing strategy for a reduced switch count five-leve topology which is the asymmetric stacked multilevel inverter (ASMLI). The ASMLI uses fewer components than the conventional MLIs when used in their five-levelconfiguration. The proposed active voltage balancing strategy uses simple measurements and logic to assure a balanced capacitors voltages during steady state and transients. The performance was examined and compared based on two modulation techniques with LCL filter and RL load using MATLAB/Simulink. The results show that the active voltage balancing strategy can trace all capacitors voltages to the reference value simultaneously with less than 1% voltage error, fast dynamic response, and an acceptable total harmonic distortion (THD) which allows the proposed setup to be an available option for medium voltage applications.<br /><div> </div>

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Section: Introductionmentioning

confidence: 99%

Active voltage balancing strategy of asymmetric stacked multilevel inverter

Kasim

Hassan

2021

IJEECS

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“…Three multilevel topologies are considered conventional topologies: diode clamped multilevel converter, flying capacitor multilevel converter, and cascade H-bridge converter. The conventional five-level topologies are compared in [9]. Each topology suffers from its limitation; the cascade H-bridge requires isolated DC sources that may not be available.…”

Section: Introductionmentioning

confidence: 99%

Model Predictive Current Control with Asymmetric Stacked Multilevel Inverter and LCL-Filter Based STATCOM

Kasim

Hassan

2021

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The work presented in this paper deals with a proposal of a new topology of a multilevel inverter to act as a Static synchronous Compensator (STATCOM). The proposed inverter is the five-level Asymmetric Stacked Multi-Level Inverter (ASMLI). One of the essential features of this inverter that distinguishes it from the conventional types is that it achieves the required voltage levels with fewer switching devices, leading to simplifying the control process. Moreover, the work includes using a Finite Control Set Model Predictive Current Control (FCS-MPCC) to control the proposed structure. The FCS-MPCC control strategy performs the finite optimization process at the current sampling instant to provide the optimum switching states to the inverter at the next sampling instant. Therefore, this control strategy allows injecting harmonic current and reactive power compensation to reduce source current distortion and improve the voltage profile and power factor. The optimization mechanism reduces the cost function, which is a function of measuring the network current's deviation from the reference value and how the capacitor voltage deviates from the required values. LCL-filter was used to connect this setup to the grid, and its resonance was actively damped using the multivariable capabilities of the FCS-MPCC. The proposed control framework was simulated using MATLAB/Simulink 9.1 environment and tested in a distorted and healthy network compared to a conventional two-level converter with RL-filter. The STATCOM was used to inject reactive power to raise the source power factor to unity and reduce source current harmonics by injecting harmonic current. The proposed prototype could absorb 70% of source current harmonics, which is nearly 25% better than a conventional inverter, inject an appropriate amount of reactive power, and raise the source power factor to unity in two case scenarios. The performance achieved was promising at steady-state operation and speedy response during transients with balanced capacitors voltages.

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“…In recent years, researchers have been paying increasingly attentions to multi-level inverters [1], which have a lot of merits. Owing to relatively low total harmonic distortion (THD) and the voltage stress on power devices [2], [3], multi-level inverters are very popular in many fields, such as motor drives [4], [5]. The neutral point clamped 3-level inverter (NPC 3LI) is widely applied among all multi-level topologies, because the hardware circuit is simple and only one dc-voltage source is needed.…”

Section: Introductionmentioning

confidence: 99%

A Carrier-Based PWM Strategy Providing Neutral-Point Voltage Oscillation Elimination for Multi-Phase Neutral Point Clamped 3-Level Inverter

et al. 2019

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General pulse width modulation (PWM) model for multi-phase neutral point (NP) clamped (NPC) 3-level inverter (3LI) is described. A novel PWM strategy for N -phase NPC 3LI with unconditional NP voltage balance is proposed as well as its carrier-based realization, in which PWM sequences are generated by comparing a single carrier wave with double modulation waves. The proposed PWM strategy is consistent with the principle of virtual space vector PWM (VSVPWM). However, the mechanism of NP voltage balance under the proposed PWM strategy is based on precisely calculating and executing level 1 action time of each phase, which may be influenced by some non-ideal factors. To avoid that, an active NP voltage control for the proposed PWM strategy is put forward. Then 3-phase and 5-phase NPC 3LIs are built as examples to verify the correctness of the proposed PWM strategy. Finally, the experimental results indicate that the proposed PWM strategy has better NP voltage control abilities.INDEX TERMS 3-level inverter (3LI), N -phase, neutral point (NP) clamped (NPC), carrier-based, neutral point (NP) voltage.

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A comparative analysis of classical three phase multilevel (five level) inverter topologies

Cited by 25 publications

References 22 publications

Active voltage balancing strategy of asymmetric stacked multilevel inverter

Active voltage balancing strategy of asymmetric stacked multilevel inverter

Model Predictive Current Control with Asymmetric Stacked Multilevel Inverter and LCL-Filter Based STATCOM

A Carrier-Based PWM Strategy Providing Neutral-Point Voltage Oscillation Elimination for Multi-Phase Neutral Point Clamped 3-Level Inverter

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