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Journal ArticleDOI

Novel Approach of Power Quality Issues Suppression using Cascaded H-Bridge Multilevel Inverter Based DSTATCOM

TL;DR: In this article , a three level H-bridge topology cascaded multilevel inverter based DSTATCOM is used to compensate the reactive power with the injection of shunt current.
Abstract: In modern information society requirements and expectations associated with power quality have become increasingly important. Among the different disturbances affecting the power quality, the voltage sag are considered as a most important power quality problem faced by utilities & industrial consumer & equipment like PLC (Programmable Logic Controller), ASD (Adjustable Speed Drives) which need to be fully investigated. Custom power device are effective means for mitigating the voltage related issues prominently voltage sag, unbalanced load voltage, voltage regulation, sag/ swell etc. by compensating the reactive power with the injection of shunt current. In this paper by using three level H-bridge topology cascaded multilevel inverter based DSTATCOM the Power Quality issues are compensated effectively.
References
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Journal ArticleDOI
TL;DR: The most important topologies like diode-clamped inverter (neutral-point clamped), capacitor-Clamped (flying capacitor), and cascaded multicell with separate DC sources are presented and the circuit topology options are presented.
Abstract: Multilevel inverter technology has emerged recently as a very important alternative in the area of high-power medium-voltage energy control. This paper presents the most important topologies like diode-clamped inverter (neutral-point clamped), capacitor-clamped (flying capacitor), and cascaded multicell with separate DC sources. Emerging topologies like asymmetric hybrid cells and soft-switched multilevel inverters are also discussed. This paper also presents the most relevant control and modulation methods developed for this family of converters: multilevel sinusoidal pulsewidth modulation, multilevel selective harmonic elimination, and space-vector modulation. Special attention is dedicated to the latest and more relevant applications of these converters such as laminators, conveyor belts, and unified power-flow controllers. The need of an active front end at the input side for those inverters supplying regenerative loads is also discussed, and the circuit topology options are also presented. Finally, the peripherally developing areas such as high-voltage high-power devices and optical sensors and other opportunities for future development are addressed.

6,472 citations

Proceedings ArticleDOI
10 Sep 2001
TL;DR: In this article, the authors describe the techniques of correcting the supply voltage sag in a distribution system by two power electronics based devices called DVR and D-STATCOM, and the minimum apparent power injection required to correct a given voltage sag by these devices is also determined and compared.
Abstract: This paper describes the techniques of correcting the supply voltage sag in a distribution system by two power electronics based devices called DVR and D-STATCOM. A DVR injects a voltage in series with the system voltage and a D-STATCOM injects a current into the system to correct the voltage sag. The steady state performance of both DVR and D-STATCOM is determined and compared for various values of voltage sag, system fault level and load level. The minimum apparent power injection required to correct a given voltage sag by these devices is also determined and compared. The maximum voltage sag that can be corrected without injecting any active power into the system is also determined. Simulation results indicated that a DVR can correct a voltage sag with much less injected apparent power compared to that of a D-STATCOM.

188 citations

Journal ArticleDOI
07 Aug 2002
TL;DR: In this paper, the topology and control of a distribution static compensator (DSTATCOM) that can be operated flexibly in the voltage or current control mode are discussed, irrespective of unbalance and harmonic distortions in load currents or source voltages.
Abstract: The topology and control are discussed of a distribution static compensator (DSTATCOM) that can be operated flexibly in the voltage or current control mode. In the voltage control mode, the DSTATCOM can force the voltage of a distribution bus to be balanced sinusoids. In the current control mode, it can cancel distortion caused by the load, such that current drawn by the compensated load is pure balanced sinusoid. Both these objectives are achieved, irrespective of unbalance and harmonic distortions in load currents or source voltages. The chosen DSTATCOM topology includes three single-phase voltage source inverters connected in parallel to a filter-capacitor, which allows the high-frequency component of the current to pass. A switching control scheme is proposed, and its suitability is proved for this problem. The proposed scheme is verified using computer simulation studies.

108 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of voltage sags in industrial systems on adjustable speed drives is investigated. But the authors focus on the effects of sags on the power system protections and in order to improve the susceptibility of the adjustable speed drive under sags.
Abstract: This paper presents results relating to the effect of voltage sags in industrial systems on adjustable speed drives. The influence of the source impedance, dc link capacitor, characteristics of voltage sags and the effect of the utility is computed. The results from the analysis can be used during the design task of the power system protections and in order to improve the susceptibility of the adjustable speed drives (ASD ́s) under sags. Simulation and experimental results are provided.

106 citations

Proceedings ArticleDOI
14 Oct 1998
TL;DR: In this article, a generalized dip model is built for all unbalanced voltage dips taking into account the fault types, transformer types and load connections, which shows the transformation for different types of unbalanced dips.
Abstract: This paper analyses the characteristic of voltage dips in power systems with special emphasis on unbalanced dips and symmetrical components analysis. A generalized dip model is built for all unbalanced dips taking into account the fault types, transformer types and load connections, which shows the transformation for different types of unbalanced dips. The characterization results in a so-called "remaining complex voltage" (a generalized magnitude and phase angle shift) for balanced and unbalanced dips and a factor, related to the rotating machine contribution to the source impedance for unbalanced dips. It is shown that the factor is close to unity, so that both balanced and unbalanced dips can be characterized through one phasor.

71 citations