Single Phase Single Stage Boost Inverter Study

Novel 3-Phase Single stage boost inverter: Analysis, Design and Experimentation
M K Pathak, Member, Dogga Raveendhra and Aravind Panda
Abstract— this paper introduces a novel type of 3-phase single stage dc-ac converter, which is controlled by sliding mode control, offers intrinsic step up abilities. Proposed inverter is designed with lesser number of solid state semiconductor switches and small passive elements. Sliding mode controller (robust controller) is designed to control this power converter in order to achieve high robustness, sustain any kind of line or load variations and achieve good dynamic response. In addition to this the voltage across the each capacitor is less when compared with existed traditional boost inverter topologies,
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Whereas third scheme, involves first step up operation and then inversion. To increase the output ac voltage from a dc source, usage of a conventional voltage-source inverter (VSI) fed step up transformer can provide simple solution. In [2], a step-up transformer is utilized at line frequency to boost the voltage coming from inverter. However, this solution is suffering from several disadvantages, such as loud noise, high cost, high volume, bulk size, lesser power/weight ratio and relatively high cost. Furthermore, the transformer has to be designed for a wide power range, leads to a poor efficiency [2]. The functionality of transformer (boosting the voltage) stage can be replaced by either by step up dc-dc converter or by step up ac-ac converter as mentioned in scheme 2 or 3, which utilizes the concept of “less iron more silicon”. However, scheme 2 demands more number of switches to provide required output, which leads to increase the cost, size and complicated control strategies. However, scheme 3, in contrast with the previous two schemes [2], associated with two individual control structures and uses one more solid-state switch, power diode, an inductor, as well as an electrolytic capacitor bank at the dc bus to replace the transformer or step up ac-ac converter functionality i.e., providing higher voltage in comparison with input stage. A dc–dc converter and an inverter are cascaded together to form a two stage topology is widely used scheme for dc-ac power conversion. First stage of power conversion involves the dc–dc converter which is used for boosting and regulating the dc-bus voltage, and in the later stage, the inverter is used for converting the dc voltage into ac voltage. Such above mentioned two-stage schemes are time tested and work well, but suffers from lower efficiency, higher device count, larger size, higher cost and lower

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