A New Soft-Switching Solution in Three-Level Neutral-Point-Clamped Voltage Source Inverters

Szular, Zbigniew; Rozegnał, Bartosz; Mazgaj, Witold

doi:10.3390/en14082247

Cited by 6 publications

(4 citation statements)

References 18 publications

(47 reference statements)

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“…1, but this time obtained for the time period 0-20 ms, that is, with the active filter already in operation, but before the load is turned on (see Figure 3). Since the DC-link capacitor voltage is at its maximum during this period, see (3) and Figure 4, the maximum switching frequency then occurs, especially when source voltage is close to zero, see (26) and (27). It can be seen that for these conditions the frequency reduction effect is considerable as well.…”

Section: Conductance Signal Accuracymentioning

confidence: 91%

“…Regardless of how the current of the active filter is controlled, the action of its switches always causes energy dissipation [21][22][23][24][25][26][27]. This raises the temperature of switches and other active filter elements, increases the operating costs of the filter, and can cause the need for an efficient cooling system, which is required to ensure the elements are within their specified operating temperature range.…”

Section: Introductionmentioning

confidence: 99%

“…The other two ways consist in the appropriate construction of the switching circuits of the converter. In particular, power loss can be reduced by diminishing the product of the voltage and current of the switch when switching, typically with the use of additional circuitry [24,27]. Unfortunately, this method increases the volume and cost of the converter.…”

Section: Introductionmentioning

confidence: 99%

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Improving the Efficiency of the Shunt Active Power Filter Acting with the Use of the Hysteresis Current Control Technique

Szromba

2023

Energies

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Calculation of the reference waveform for the compensating current generated by the shunt active power filter (ShAPF) can be carried out using various methods. In this article, this calculation is performed indirectly on the basis of tracking and processing of the ShAPF DC-link capacitor voltage. At the same time, the energy stored in this capacitor is used to generate the compensating current. Therefore, the operation of this capacitor during compensation, i.e., changes in energy stored in it and the voltage waveform on its terminals, is characteristic and crucial for the method considered. Once the current reference waveform is determined, it can be generated by ShAPF in various ways, but always using the energy stored in the DC-link capacitor. The power module of the active filter uses transistor switches to realize the required compensating current. During their operation, power losses occur that can be divided into either switching or conduction. The article shows that, in the case of the indirect control method and the hysteresis current control technique used, it is possible to reduce the operating frequency of the switches and the load on the DC-link capacitor. Thanks to this, it is possible to reduce power losses in these elements and extend their lifetime.

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Section: Conductance Signal Accuracymentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improving the Efficiency of the Shunt Active Power Filter Acting with the Use of the Hysteresis Current Control Technique

Szromba

2023

Energies

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“…In distributed generation, the voltage source inverter is a widely used DC-AC power conversion structure [1,2]. When a three-phase voltage inverter is applied to photovoltaic power generation, a period of dead time needs to be added, and soft switching technology is used to prohibit the shoot-through state of the inverter bridge [3,4]. However, the excessive dead time may lead to distortion of the inverter output current.…”

Section: Introductionmentioning

confidence: 99%

Common-Mode Voltage Reduction and Neutral Point Voltage Balance Modulation Technology of Quasi-Z-Source T-Type Three-Level Inverter

Xie

Yao

2022

Electronics

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The quasi-Z-source T-type inverter is a new type of three-level inverter. Compared with other three-level inverters, the quasi-z-source T-type inverter is characterized by its fault tolerance capability and boost capability. In the inverter, the modulation strategy greatly affects the performance. Aiming at the problems in three-level inverters such as excessive common-mode voltage and unbalanced neutral point potential, a space vector pulse width modulation (SVPWM) for a quasi-z-source T-type three-level inverter based via line voltage coordinate is proposed in this paper. The main research work and achievements of this paper include: (1) based on the existing research results, an SVPWM modulation strategy for the quasi-Z-source T-type inverter is proposed. The modulation method proposed by this paper can effectively reduce the common-mode voltage and balance the neutral point voltage. (2) This paper analyzes the principle of the line voltage coordinate system and makes some modifications to the line voltage coordinate system so that the proposed modulation scheme can be applied to the line voltage coordinate system. Compared with the traditional αβ coordinate system, the SVPWM algorithm in the line voltage coordinate system has the characteristic of simple calculation. The simulation and experiment results show that the control method has good performance under the conditions of dynamic response and imbalance.

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Design of a new modular‐isolated‐forward‐based active snubber cell for power switches

Bodur,

Gundogan,

Bakan

2024

Circuit Theory & Apps

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In this paper, a new modular‐isolated‐forward‐based active snubber cell (SC) for power switches is designed. In the proposed new SC, the zero voltage transition (ZVT) technique is implemented with a forward converter although the current counterparts generally use a flyback converter. In the converter with the new SC, the main switch is turned on with ZVT (full zero voltage switching [ZVS]) and turned off with ZVS, the main diode is turned off with zero current switching (ZCS), the auxiliary switch is turned on with ZCS and turned off with ZVS, and the parasitic capacitor energies are recovered. In addition, thanks to the forward converter, it has been possible to minimize the transformer leakage inductance and greatly reduce the current values of devices in the new SC. The new cell is applied to a single‐phase, grid‐connected, T‐type three‐level inverter (T2‐3LI) as an example. A detailed steady‐state analysis of this inverter was made, and the theoretical analysis was confirmed with measurement results taken from a prototype with 100 kHz and 3.3 kW values. Compared to its hard switching (HS) equivalent, in the converter with soft switching (SS) cell, the total circuit loss was reduced from about 248 W to 86 W, thus achieving an increase in the total efficiency from 92.5% to 97.4%.

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A New Soft-Switching Solution in Three-Level Neutral-Point-Clamped Voltage Source Inverters

Cited by 6 publications

References 18 publications

Improving the Efficiency of the Shunt Active Power Filter Acting with the Use of the Hysteresis Current Control Technique

Improving the Efficiency of the Shunt Active Power Filter Acting with the Use of the Hysteresis Current Control Technique

Common-Mode Voltage Reduction and Neutral Point Voltage Balance Modulation Technology of Quasi-Z-Source T-Type Three-Level Inverter

Design of a new modular‐isolated‐forward‐based active snubber cell for power switches

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