Asymmetrical DC link voltage balance of a cascaded two level inverter based STATCOM

Babu, N. N. V. Surendra; Rao, D. Appa; Fernandes, B. G.

doi:10.1109/tencon.2010.5686708

Cited by 12 publications

(5 citation statements)

References 8 publications

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“…In recent years cascaded two-level inverter topology has become popular due to its simple power circuit configuration [5]. This topology is constructed by using conventional two level inverters as shown in the Fig.…”

Section: Grid Connected Cascaded Two Level Invertermentioning

confidence: 99%

“…Multilevel converter structures have three major classifications; (1) neutral point clamped or diode clamped (2) flying capacitor or capacitor clamped (3) cascaded H-bridge inverter with isolated dc source. In recent years, cascaded H-bridge inverter topology is very much popular because of its modular circuit lay out [5]. The dual inverter connects to the primary of an open-end threephase transformer.…”

Section: Introductionmentioning

confidence: 99%

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Cascaded two level inverter based grid connected photovoltaic system: Modelling and control

Kumar

Saha

Dey

2014

2014 IEEE International Conference on Industrial Technology (ICIT)

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In this paper, isolated source cascaded two level inverter (CTLI) has been proposed for grid connected photovoltaic system. The system is operated to supply active power with available solar irradiance and to supply reactive power in absence of it. The conventional CTLI is controlled through vector control topology to provide controlled active and reactive power in the said conditions. The photovoltaic system is modelled and tested with the controlled grid connected CTLI, for solar irradiance variation, and reference reactive power variation in simulation environment. The control scheme has been introduced for dc link voltage of the dual level inverter. The dc link voltage is found to be maintained at required level for both type of power supply.

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Section: Grid Connected Cascaded Two Level Invertermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cascaded two level inverter based grid connected photovoltaic system: Modelling and control

Kumar

Saha

Dey

2014

2014 IEEE International Conference on Industrial Technology (ICIT)

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“…There are three major MLI topologies, which are neutral point clamp (NPC), a flying capacitor (FC) and cascaded Hbridge (CHB). The latter is very popular because of its employing circuit system (Babu, et al, 2010) and an insignificant number of dc-link capacitors. Moreover, MLI was cascaded requirement various dc sources which can be obtained something from PV string and also, it is potential to obtain free from outside control voltage control and tracking the maximum power point in each series.…”

Section: Introductionmentioning

confidence: 99%

Harmonic Reduction for Grid-Connected Photovoltaic System based on Multilevel Inverter

2018

Aust. J. Basic & Appl. Sci.

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This paper investigates the utilization of Multilevel Inverter (MLI) to reduce the harmonics of grid-connected photovoltaic (PV) system. MLIs act as a promising interface in medium voltage networks for many usages because their modularity and lower voltage stress towards the switches. In addition, they provide a high-form output with low symmetric deformation. It is proposed to use a Cascaded H-Bridge MLI (CHB-MLI) with network-linked PV systems since they require many sources on the DC side with phaseshifted carriers pulse width modulation. The mission of these converts is to synthesize a staircase AC output voltage from several DC voltage levels. A seven-level modular CHB-MLI is analyzed for grid-connected PV system with a Maximum Power Point Tracking (MPPT) algorithm. A free from outside control dc-link voltage controller for each H-bridge is performed by managing a battery system to maintain constant voltage and satisfy the grid-connected power. The simulation results ensure the validity and effectiveness of the introduced algorithm.

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“…Various VAr compensation schemes based on this topology are proposed in literature [14] - [16]. In [14], a three level inverter and two level inverter are connected on either side of transformer winding, but dc link voltages are maintained by separate converters.…”

Section: Introductionmentioning

confidence: 99%

“…In [15], conventional two level inverters are used, but it requires additional LCL filter. In [16], a simple control strategy is proposed for the self supported dc buses of two inverters using sinusoidal PWM.…”

Section: Introductionmentioning

confidence: 99%

A new multilevel STATCOM based on cascaded two level inverters

Babu

Apparao

Fernandes

2011

2011 International Conference on Power Engineering, Energy and Electrical Drives

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In this paper a new multilevel STATCOM based on cascaded two level inverter is proposed. This topology has better utilization of dc link voltage and low THD. It consists of two conventional three phase two level inverters connected in cascade. The cascaded inverter uses 12-sided polygonal voltage space vectors. To obtain 12-sided polygonal voltage space vectors, the dc link voltage of inverter-2 must be maintained at 0.366 times dc link voltage of inverter-1. A simple control strategy is proposed for reactive power compensation as well as to maintain dc link voltages at the required levels. Simulation studies are carried out to predict the system performance. A laboratory prototype is also developed to validate the results obtained by simulation.Index Terms-Multilevel inverter, 12-sided voltage space vector polygon, STATCOM, Voltage unbalance.

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Asymmetrical DC link voltage balance of a cascaded two level inverter based STATCOM

Cited by 12 publications

References 8 publications

Cascaded two level inverter based grid connected photovoltaic system: Modelling and control

Cascaded two level inverter based grid connected photovoltaic system: Modelling and control

Harmonic Reduction for Grid-Connected Photovoltaic System based on Multilevel Inverter

A new multilevel STATCOM based on cascaded two level inverters

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