Transformerless series sag compensation with a cascaded multilevel inverter

Visser, A.J.; Enslin, J.H.R.; Mouton, Toit

doi:10.1109/tie.2002.801067

Cited by 59 publications

(20 citation statements)

References 12 publications

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“…This is also different from the multi-pulse converter which includes multiple six-pulse three phase converters [14]. Compared to the transformer-less realisation of the DVR with the conventional H-bridge cascaded multilevel converter [15]- [17], the Common DC Bus (CDCB) structure significantly simplifies the energy management on the DC side while retaining all the other good features of the multilevel converter, such as high quality waveforms, low EMI and evenly load-sharing among semiconductor switches, etc.. Furthermore, CDCB structure reduces the low frequency DC link ripple current due to the phase shift between the three phases and high frequency ripple currents resulting from switching harmonics cancelled due to the carrier phase shift.…”

Section: Power Architecturementioning

confidence: 99%

Implementation of H Bridge Inverter Based DVR Using Atmel 89c2051

Murugan¹,

Nirmalkumar²,

Vijayakumar³

2009

IJCEE

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I. INTRODUCTIONWith the rapid technology advancements in industrial control processes, electric utilities are experiencing more demanding requirements on the power quality from the large industrial power consumers. Such power quality problems have been better appreciated when the price paid due to the economic losses caused by them is large. These concerns are reflected in the newer versions of power quality standards, such as IEEE 1159-1995 [1] and . Trends of deregulation happening in Europe and America exert pressures on the utilities to accommodate such demanding requirements in a competitive electricity market environment.Among the various power quality problems, the voltage sag, usually resulting from the faults on parallel transmission/distribution feeders, is attracting quite a large amount of attention of researchers from both industry and academia [3]- [5]. A definitive solution to this problem at large power levels has been commonly called dynamic voltage restorer (DVR), under the rubric of the custom power concept introduced by EPRI [6]. The main function of DVR is to mitigate the voltage sag, although sometimes, additional functions such as harmonic compensation and reactive power compensation are also integrated to the device. It has also been shown in a previous study that the series compensation device such as the DVR as shown in Fig. 1(a) is preferred over shunt compensation strategy as shown in Fig. 1(b) for stiff systems [7], typical of large industrial load installations. Much of the published literature on DVRs deal with a voltage source converter (VSC) realized using two-level converters, which are well suited for 480-V systems [8], [9]. While in high power applications such as at distribution voltage levels, a multilevel converter is a more attractive solution, whose application in a DVR has not been well addressed. On the other hand, for the control of DVR, the open loop feed-forward technique is found to be a common practice, which generally results in poor damping of the output harmonic filter [10]. In the literatures [1] to [10], the implementation details of DVR using Atmel microcontroller are not available. In this paper, the hardware implementation details using embedded microcontroller are presented. The paper is organized as follows. The power architecture is introduced in Section II followed by simulation results in Section III. The experimental results are given in section IV. II. POWER ARCHITECTUREAlthough various topologies may be used to realize the VSC illustrated in Fig. 1, at higher power levels cascaded H-bridge multilevel power conveners are seen to have advantages in several aspects [11], [12]. First, multilevel converters can realize the higher power and high voltage using semiconductor switches of relative small ratings while avoiding the voltage sharing and current sharing problems associated with series and parallel connection of switches commonly employed in two-level converter realization. Second, multilevel converters can synthesize the output voltage with small...

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Section: Power Architecturementioning

confidence: 99%

Implementation of H Bridge Inverter Based DVR Using Atmel 89c2051

Murugan¹,

Nirmalkumar²,

Vijayakumar³

2009

IJCEE

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“…The Series Active Power Filter consists of a voltage-source inverter (behaving as a controlled voltage-source) and requires 3 single-phase transformers to interface with the power system. However, some authors have presented research results of Series Active Power Filter topologies without the use of line transformers [21,22] load current harmonics but it acts as high-impedance to the current harmonics coming from the electrical power grid side. Therefore, it guarantees that passive filters eventually placed at the load side will work appropriately and not drain harmonic currents from the rest of the power system.…”

Section: Series Active Power Filtermentioning

confidence: 99%

Active Power Conditioners to Mitigate Power Quality Problems in Industrial Facilities

Afonso¹,

Pinto²,

Goncalves³

2013

Power Quality Issues

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“…This method gets rid of the injection transformer used in the basic configuration of the DVR. This arrangement is often called a transformer-less or multilevel or a cascade inverter DVR [6][7]. The nonlinear characteristics of semiconductor devices cause distorted waveforms associated with high frequency harmonics at the inverter output.…”

Section: B Inverter Circuitmentioning

confidence: 99%

Dynamic Voltage Restorer (DVR) for Voltage Sag Mitigation

El-Gammal¹,

Abou-Ghazala²,

El-Shennawy³

2011

ijeei

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Abstract:The Dynamic Voltage Restorer (DVR) is fast, flexible and efficient solution to voltage sag problem. The DVR is a power electronic based device that provides three-phase controllable voltage source, whose voltage vector (magnitude and angle) adds to the source voltage during sag event, to restore the load voltage to pre-sag conditions. The DVR is designed for protecting the whole plant with loads in the range of some MVA. The DVR can restore the load voltage within few milliseconds. Several configurations and control methods are proposed for the DVR. In this paper, an overview of the DVR, its functions, configurations, components, compensating strategies and control methods are reviewed along with the device capabilities and limitations.

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Transformerless series sag compensation with a cascaded multilevel inverter

Cited by 59 publications

References 12 publications

Implementation of H Bridge Inverter Based DVR Using Atmel 89c2051

Implementation of H Bridge Inverter Based DVR Using Atmel 89c2051

Active Power Conditioners to Mitigate Power Quality Problems in Industrial Facilities

Dynamic Voltage Restorer (DVR) for Voltage Sag Mitigation

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