Improved Modulation Scheme for Loss Balancing of Three-Level Active NPC Converters

Deng, Yi; Li, Jun; Shin, Kee Ho; Viitanen, Tero; Saeedifard, Maryam; Harley, R.G.

doi:10.1109/tpel.2016.2573823

Cited by 85 publications

(25 citation statements)

References 19 publications

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“…The employment of several VSCs in the hybrid system with different active/reactive power controls has made the estimations of the power losses of the converters of prime concern. The power losses modeling in this paper has been carried out in MATLAB based on numerical circuit simulations using the same basics in [30]. The power losses due to the operation of the three-level T-type inverter are analytically determined based on practical datasheet parameters from the manufacturer.…”

Section: Power Losses Analysismentioning

confidence: 99%

An Efficient Reactive Power Dispatch Method for Hybrid Photovoltaic and Superconducting Magnetic Energy Storage Inverters in Utility Grids

2020

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The intermittent property and increased grid restrictions have become the most critical elements for increasing penetration levels of clean renewable energy sources (RESs). Smart inverters with combined RESs integration and reactive power support for utility grids have recently found widespread applications due to their techno-economic benefits. In smart inverters, the distribution-static compensator (DSTATCOM) functionality is inherently integrated to the RESs inverters. However, optimized reactive power-sharing between these inverters has become a big issue for the control systems of utility grids. There are numerous existing attempts presented in the literature for addressing these challenges, although they disadvantage low efficiency, uneven sharing, complex implementations, and/or costly added devices. Therefore, this paper proposes an efficient reactive power dispatch method between hybrid renewable energy generation and energy storage systems. The proposed method enhances the energy efficiency of the utility grid by adopting the reactive power share between interfacing inverters according to the estimated power losses. Besides, the proposed method enhances the reliability of smart inverters by relieving their thermal stresses through adopting their reactive power share according to the estimated power losses. The hybrid photovoltaic (PV) generation with superconducting magnetic energy storage (SMES) systems is selected as a case study for validating the new proposed reactive power dispatch method. The results, comprehensive discussions, and performance comparisons have verified the superior performance of the new proposed reactive power dispatch method. INDEX TERMS distribution static compensator, photovoltaic (PV), reactive power dispatch, smart inverters, superconducting magnetic energy storage (SMES)

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Section: Power Losses Analysismentioning

confidence: 99%

An Efficient Reactive Power Dispatch Method for Hybrid Photovoltaic and Superconducting Magnetic Energy Storage Inverters in Utility Grids

2020

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“…Additionally, NPC topology does not produce common-mode (CM) current, thus it is more suitable for PV generation systems [3,4] and can support longer device lifetime with a lower instantaneous rate of voltage change (dv/dt) [5]. However, NPC topology suffers from unequal heat distribution among the semiconductor devices owing to uneven power loss distribution, as reported in [6][7][8][9]. To overcome this problem, the active clamped diodes were replaced by active switches, achieving and an active neutral point clamped (ANPC) topology [9].…”

Section: Introductionmentioning

confidence: 99%

Open-Circuit Fault Tolerance Method for Three-Level Hybrid Active Neutral Point Clamped Converters

2020

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Three-level converters are the most important technologies used in high power applications. Among these technologies, active neutral point clamped (ANPC) converters are mainly used for industrial applications. Meanwhile, recent developments have reduced losses and increased efficiency by using a hybrid combination of Si-IGBT and SiC-MOSFET switches to achieve hybrid ANPC (HANPC) converters. Open-circuit failure is regarded as a common and serious problem that affects the operational performance. In this paper, an effective fault-tolerant method is proposed for HANPC converters to safely re-utilize normal operation and increase the reliability of the system under fault conditions. Sequentially, regarding different topologies with reference to earlier fault tolerance methods which could not be applied to the HANPC, the proposed strategy enables continuous operation under faulty conditions effectively without using any additional devices by creating new voltage references, voltage offset, and switching sequences under the faulty conditions. Consequently, no additional costs or changes are associated with the inverter. A detailed analysis of the proposed strategy is presented highlighting the effects on the voltage, currents, and the corresponding total harmonic distortion (THD). The simulation and experimental results demonstrate the capability and effectiveness of the proposed method to maintain normal operation and eliminate the output distortion.

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“…However, the controller cannot realize accurate offline segmentation due to the huge data storage. Considering the unbalanced power losses of power switches in three-level neutral-point-clamped (NPC) grid-connected inverter, References [19] advises to balance the losses of power switches and elevate the maximum output power of the system by replacing the traditional three-level NPC inverter with threelevel ANPC inverter.…”

Section: Introductionmentioning

confidence: 99%

Multi-Objective Optimal Model Predictive Control for Three-Level ANPC Grid-Connected Inverter

2020

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The three-level active-neutral-point-clamped (ANPC) grid-connected inverter is a promising alternative for photovoltaic (PV) power generation, thanks to its capability of balancing the losses of power devices. This paper proposes a multi-objective optimal model predictive control (MO 2-MPC) algorithm for three-level ANPC grid-connected inverter, and thus the number of rolling optimizations of the model can be reduced by eliminating the switching states of the three-level output that violate the unit level jump principle. The power loss of each switch was calculated in real time by the linear fitting of the turn-on and turn-off losses of the switches, and the imbalanced losses were added to the target cost function to minimize imbalance losses. Finally, the proposed control method was proved correct and effective through an experiments prototype. INDEX TERMS Three-level active-neutral-point-clamped (3L-ANPC), grid-connected inverter, multiobjective optimal model predictive control (MO 2-MPC), balancing the losses of power switches.

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Improved Modulation Scheme for Loss Balancing of Three-Level Active NPC Converters

Cited by 85 publications

References 19 publications

An Efficient Reactive Power Dispatch Method for Hybrid Photovoltaic and Superconducting Magnetic Energy Storage Inverters in Utility Grids

An Efficient Reactive Power Dispatch Method for Hybrid Photovoltaic and Superconducting Magnetic Energy Storage Inverters in Utility Grids

Open-Circuit Fault Tolerance Method for Three-Level Hybrid Active Neutral Point Clamped Converters

Multi-Objective Optimal Model Predictive Control for Three-Level ANPC Grid-Connected Inverter

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