Simplified Space Vector Pulse Width Modulation for Four-Level Neutral Point Clamped Inverter

Pham, Le Nam; Dung Phan, Quoc; Nguyen, Nho-Van

doi:10.1109/isee59483.2023.10299831

Cited by 2 publications

(2 citation statements)

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“…Problems of modulation of the NPC inverter for the improvement of the quality of the output voltage and the proper loading of the input capacitors are the subject of research in the area of systems with a number of levels greater than four [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. The optimization objectives here are the reduction of the complexity of the calculations [4], the improvement of the THD, as in [16,17] for the 5-level system, in [18] for the 7-level system, where a better performance of the torque ripple motor was obtained, which was powered by an inverter, and in [19] for the five-level inverter, a mathematically modified PD-PWM method was used to reduce the value of the odd harmonics.…”

Section: Introductionmentioning

confidence: 99%

“…Implementation of inverter modulation while maintaining appropriate output voltage quality is also possible with unequal DC-link voltages, which results from the system concept where DC-link capacitors are powered by photovoltaic sources presented for the three-phase NPC five-level inverter in [25]. Due to the potential complications of modulation and the significant number of voltage vectors in multiphase systems, research is also carried out to simplify control, as exemplified by the concept of simplified space vector modulation presented in [26].…”

Section: Introductionmentioning

confidence: 99%

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Efficiency and Power Loss Distribution in a High-Frequency, Seven-Level Diode-Clamped Inverter

Stala,

Folmer,

Penczek

et al. 2023

Energies

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The paper presents efficiency and power loss analysis in a high-frequency, seven-level diode-clamped inverter (7LDCB). The inverter is composed of four-level (4L) diode-clamped branches based on MOSFET transistors and Si Schottky diodes. The range of DC-link voltages enables the operation of the inverter in connection with a single-phase power grid. The tested inverter can be controlled using various modulation concepts that affect its parameters, but also energy losses. Carrier-based modulation, which may be useful in a few applications, is compared to selective modulation based on the state machine (SM-based) algorithm. The article demonstrates the efficiency level of the inverter as well as the influence of the modulation method and switching frequency on the efficiency and loss distribution in semiconductor devices. The article also shows the hardware implementation of a complex modulation algorithm based on selective switching states used to maintain voltage balance on three DC-link capacitors. Redundant switching states allow the generation of the same voltage but with the use of a selected DC-link capacitor. This makes it possible to balance the DC-link voltage with the load current. The article presents experimental results, which show the advantage of using the modulation method with selective switching states. First, it allows for equalizing the loading of DC-link capacitors. The second advantage is a more uniform distribution of losses in semiconductor components.

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