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This paper describes a three-phase cascade Static Synchronous Compensator (STATCOM) without transformer. It presents a control algorithm that meets the demand of load reactive power and also voltage balancing of isolated dc capacitors for H-bridges. The control algorithm used for inverter in this paper is based on a phase shifted carrier (PSC) modulation strategy that has no restriction on the cascaded...
Cascade H-bridge multilevel inverter is a best candidate for static VAr compensation in medium and high voltage applications. The topology consists of several capacitors to provide dc link voltage support for H-bridge inverters. Regulation of the dc link voltages at the required levels is a major research challenge in VAr compensated inverters. This paper presents a novel and simple control strategy...
In this paper, a simple static var compensating scheme using a cascaded two-level inverter-based multilevel inverter is proposed. The topology consists of two standard two-level inverters connected in cascade through open-end windings of a three-phase transformer. The dc-link voltages of the inverters are regulated at different levels to obtain four-level operation. The simulation study is carried...
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...
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