Introduction and Advantage of Space Opposite Vectors Modulation Utilized in Dual Two-Level Inverters With Isolated DC Sources

Aghazadeh, Amir; Jafari, Mohamadsaleh; Khodabakhshi‐Javinani, Naser; Nafisi, Hamed; Namvar, Hamed Jabbari

doi:10.1109/tie.2018.2880720

Cited by 32 publications

(10 citation statements)

References 36 publications

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“…When ZSC flows, which is caused by the generated zero‐sequence voltage (ZSV) on the path provided by the structure of single dc source D2L‐VSI, using D2L‐VSIs with isolated dc sources is able to eliminate ZSC completely since there is not any path for ZSC to flow [11, 22]. By using an isolating transformer to isolate dc sources, common‐mode current (CMC) could not flow from the frame of electric motors to ground, star‐point of the three‐phase supply, and finally mid‐point of the dc‐link capacitors due to the fact that the secondary windings are not grounded [23]. Although D2L‐VSIs with two isolated dc sources do not suffer from the ZSC and CMC – similar to other kinds of inverters, shaft voltage, bearing currents – they contain capacitive bearing current (d v /d t ) and electric discharge machining (EDM) currents.…”

Section: Introductionmentioning

confidence: 99%

Adapted near‐state PWM for dual two‐level inverters in order to reduce common‐mode voltage and switching losses

Aghazadeh

Khodabakhshi‐Javinani

Nafisi

et al. 2019

IET power electron.

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In this paper, a near-state pulse-width modulation (NSPWM) algorithm is proposed and implemented on dual-twolevel voltage-source inverters (D2L-VSIs) in order to reduce the common-mode voltage (CMV), the inverter switching losses, the current total harmonic distortion, and the side effects of bearing currents-compared with space vector modulation (SVM) and PWM7. To gain these goals, two conventional two-level inverters of the D2L-VSI are controlled, separately, with specific switching sequences and an adjusted phase difference between the carriers of two inverters. For evaluating and comparing these PWM techniques mathematically, both CMV root mean square generated and switching losses of the D2L-VSI are formulated as a function of the power factor of the D2L-VSI, which is driven by the methods detailed in this study. Eventually, theories and analysis, as well as simulations and experimental results-which are generated by MATLAB/Simulink environment and a 300 W scaled-down D2LVSI prototype, respectively-authenticate the superiority of the proposed NSPWM over both SVM and PWM7.

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Section: Introductionmentioning

confidence: 99%

Adapted near‐state PWM for dual two‐level inverters in order to reduce common‐mode voltage and switching losses

Aghazadeh

Khodabakhshi‐Javinani

Nafisi

et al. 2019

IET power electron.

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“…The windings of the secondary side of the transformer are connected to the utility grid with star configuration. The most important advantage of utilizing dual inverters is lower output voltage harmonics, which results in a reduced size of the inductance filter; therefore, the overall cost could be reduced [14].…”

Section: Dual Inverter Topologymentioning

confidence: 99%

“…It leads to a reduction in switching losses and lower switching frequency [15]. The advantage of implementing two isolated DC link voltage sources is the elimination of zero sequence current (ZSC) [14]. Another benefit of dual inverters compared to a traditional two-level inverter is its capability in fault tolerance.…”

Section: Dual Inverter Topologymentioning

confidence: 99%

Virtual Inertia Implementation in Dual Two-Level Voltage Source Inverters

Dashtaki

Nafisi

Pouresmaeil

et al. 2020

2020 11th Power Electronics, Drive Systems, and Technologies Conference (PEDSTC)

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In this paper, the implementation of virtual inertia in a dual two-level voltage source inverter (DTL VSI) configuration is investigated. The derivative control method is employed to provide virtual inertia. The virtual synchronous generator (VSG) topology is presented, and its elements are introduced. According to the frequency changes, the active power reference is generated. Moreover, the control structure is designed and presented to control the DTL VSI properly. By means of the derivative control method, the DTL VSI participates in the frequency regulation, and the frequency oscillations during contingencies are confined. The results show that the controller follows its reference in all cases. The potentiality of the proposed controller is confirmed through MATLAB simulations. Compared to the conventional DTL VSI, the rate of change of frequency (ROCOF) and frequency nadir are reduced during disturbances.

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“…This is obviously due to the increasing level of PV penetration on the grid at various voltage levels. In its simplest form, a SI is defined as a power electronic device that converts a DC power to an AC [10,11] with monitoring, communication and control capabilities. Modern SIs are intelligent microprocessor-based which allows for Ethernet/LAN/WAN connectivity [12].…”

Section: Introductionmentioning

confidence: 99%

Smart Inverters Functionalities and their Impacts on Distribution Feeders at High Photovoltaic Penetration: An Overview

Olowu,

Sarwat

2020

Preprint

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The increase in grid-connected photovoltaic (PV) systems has been consistent over the years. Several studies have reported the impacts of this increase on the distribution networks such as reverse power flow, voltage fluctuations, possible increase in system losses amongst others. With this rise in PV penetration level, it becomes necessary for grid tied smart inverters (SI) to be allowed to participate in feeder voltage regulation. Till date, no comprehensive technical review and analysis has been done on the impact and interaction of existing and proposed SI settings on the existing legacy voltage control devices. This paper presents a novel technical review and analysis of some voltage regulation settings of SIs and their impacts on distribution feeders including their interaction with legacy devices such as capacitors, on/off Load Tap Changers, their impact on the feeder losses, harmonic effects and economic impacts (expressed as the device cost factor) and circuit impact index (CII). The analysis of these functionalities is done using the standard IEEE 8500 distribution feeder, integrated with six PVs (based on real PV parameters and data), and strategically located with actual irradiance and temperature profile from a 1.4MW PV plant located at FIU. These PV locations were carefully selected to allow for detailed impacts studies. The results show how the various SI functions impact the reactive power injection and switching of the capacitor banks, the voltage regulator switching, the losses in the feeder, the harmonic and the CII. The Volt-Watt with rise/fall rate-ofchange limiting setting showed the least impact in terms of the CII, voltage regulator tapping and capacitor switching but with high amount of losses compared to other SI functions.

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Introduction and Advantage of Space Opposite Vectors Modulation Utilized in Dual Two-Level Inverters With Isolated DC Sources

Cited by 32 publications

References 36 publications

Adapted near‐state PWM for dual two‐level inverters in order to reduce common‐mode voltage and switching losses

Adapted near‐state PWM for dual two‐level inverters in order to reduce common‐mode voltage and switching losses

Virtual Inertia Implementation in Dual Two-Level Voltage Source Inverters

Smart Inverters Functionalities and their Impacts on Distribution Feeders at High Photovoltaic Penetration: An Overview

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