DC-link Ripple Reduction in a DPWM-based Two-Level VSC

Tcai, Anatolii; Alsofyani, Ibrahim Mohd; Lee, Kyo‐Beum

doi:10.1109/ecce.2018.8558172

Cited by 8 publications

(5 citation statements)

References 12 publications

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“…The offset voltage generated in Table 3 produces an optimized and discontinuous switching state irrespective of the PF and, in the case of balanced three-phase, is the same as that produced by the MLDPWM proposed in [23]. Therefore, it is also applicable to TPTLI.…”

Section: Proposed Per-phase Minimum-loss Dpwmmentioning

confidence: 95%

“…Therefore, it is also applicable to TPTLI. The MLDPWM proposed in [23] follows a complex procedures; it detects the phase difference (ϕ) between pole voltage and phase current in order to set the optimal discontinuous area, converts it into a phase angle (ϕ') for offset generation, and rotates the voltage reference to generate the offset voltage. In addition, since it is a modulation method that assumes a balanced three-phase state, it cannot be applied to TPFLI.…”

Section: Proposed Per-phase Minimum-loss Dpwmmentioning

confidence: 99%

“…Therefore, the reduction in switching loss is insufficient. In recent years, research has been carried out to improve the electromagnetic interference (EMI) characteristics of a DPWM by reducing the DC-link current ripple or common mode voltage(CMV) [23] ˗ [24]. However, the results of studies on selecting an offset voltage for minimizing the loss of a TPFLI when the output current is unbalanced inadequate.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Minimum Loss Discontinuous Pulse-Width Modulation Per Phase Method for Three-Phase Four-Leg Inverter

2020

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The three-phase four-leg inverter (TPFLI) provides unbalanced voltage to a load or injects unbalanced current to a grid to compensate unbalanced current. However, it has a high switching loss because of the fourth leg. This paper presents a discontinuous pulse-width modulation (DPWM) method that minimizes the per-phase switching loss of the TPFLI. The discontinuous three-dimensional spacevector pulse-width modulation (3D SVPWM) can be implemented in the TPFLI by injecting the same offset voltage as the conventional DPWM of three-phase three-leg inverter (TPTLI). However, the conventional DPWM is unsuitable for TPFLI because of its unbalanced current. We demonstrate that the discontinuous phase can be chosen according to the offset direction when a voltage reference vector is specified. Based on this result, a new per-phase minimum-loss discontinuous PWM strategy is developed and compared with the conventional DPWM. This method can also be applied to the TPTLI and implemented by injecting an offset voltage generated using the inverter phase voltage reference and phase current. Furthermore, the lifespan of a TPFLI can be extended by preventing deterioration of a specific leg. The validity of the proposed method is verified through simulation and experiments. INDEX TERMS Discontinuous pulse width modulation (DPWM), three-dimensional space vector pulse width modulation (3D SVPWM), three-phase four-leg inverter, switching loss

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Section: Proposed Per-phase Minimum-loss Dpwmmentioning

confidence: 95%

Section: Proposed Per-phase Minimum-loss Dpwmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Minimum Loss Discontinuous Pulse-Width Modulation Per Phase Method for Three-Phase Four-Leg Inverter

2020

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“…The main advantage of this proposed method is that it is straightforward and easily implemented, without additional hardware or extensive computation. Furthermore, it is known that by using DPWM, the switching losses are reduced, and better harmonic characteristics can be obtained for high modulation indices, compared with inverters that use continuous pulse-width modulation [23][24][25][26]. Although there are several different DPWM methods, conventional 60 • DPWM is most commonly used for systems with the unity power factor.…”

Section: Deadbeat Dsvm-mpc With Proposed Neural Point Balancing Methodsmentioning

confidence: 99%

Improved Deadbeat FC-MPC Based on the Discrete Space Vector Modulation Method with Efficient Computation for a Grid-Connected Three-Level Inverter System

Alsofyani

Lee

2019

Energies

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The utilization of three-level T-type (3L T-type) inverters in finite set-model predictive control (FS-MPC) of grid-connected systems yielded good performance in terms of current ripples and total harmonic distortions. To further improve the system's performance, discrete space vector modulation (DSVM) was utilized to synthesize a higher number of virtual voltage vectors. A deadbeat control (DBC) method was used to alleviate the computational burden and provide the optimum voltage vector selection. However, 3L inverters are known to suffer from voltage deviation, owing to the imbalance of the neutral-point voltage. We have proposed a simplified control strategy for balancing the neutral point in the FS-MPC with DSVM and DBC of grid-connected systems, not requiring a weighting factor or additional cost function calculation. The effectiveness of the proposed method was validated using simulation and experiment results. Our experimental results show that the execution time of the proposed algorithm was significantly reduced, while its current quality performance was not affected.

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“…The only drawback of this strategy is the increase in average costing of inverter unit which itself consumes 50 % of the cost of entire PV system [45]. The other way of increasing lifespan of reactive unit in PV inverter is by reducing the benchmark of ripple current and make sure that charging-discharging of capacitive unit remains natural even in highfrequency working situation which can be achieved either by shifting toward discontinuous Pulse width modulation (PWM) [46] or by switching toward selective harmonic PWM [47]. With low DC voltage, less ripple factor viewed from capacitor side which increases the lifespan of capacitor.…”

Section: Dc-link Voltage Impact On Reliability and Lifespan Of Invertermentioning

confidence: 99%

Topological and Reliable based selection of Inverter module for PV application under standard parameters of Cost and life-Span

Sharma

Kaur

Sharma

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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With the advancement in manufacturing and fabrication process, utilization of PV energy systems is increased throughout the globe which leads to the increase of research over lifespan and reliability index on an entire PV system. This increment results in low average manufacturing as well running costs of the entire PV system. The most important portion of the PV system apart from the PV module is the inverter unit which provides conversion and synchronization between the PV system and OLGS. With vast research carried over design as well controlling the architecture of Inverter, it becomes a tedious task to choose the optimal design based on the application area and capital cost. In this paper, we discuss issues faced by the inverter units on the platform of reliability and life span along with the suitable survey. Further to conclude the work result of Inverter unit connected to selected PV module when connected to OLGS.

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DC-link Ripple Reduction in a DPWM-based Two-Level VSC

Cited by 8 publications

References 12 publications

Minimum Loss Discontinuous Pulse-Width Modulation Per Phase Method for Three-Phase Four-Leg Inverter

Minimum Loss Discontinuous Pulse-Width Modulation Per Phase Method for Three-Phase Four-Leg Inverter

Improved Deadbeat FC-MPC Based on the Discrete Space Vector Modulation Method with Efficient Computation for a Grid-Connected Three-Level Inverter System

Topological and Reliable based selection of Inverter module for PV application under standard parameters of Cost and life-Span

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