Abstract
Abstract Bipolar hybrid microgrid application is enhancing in power systems since this type of microgrid owns a DC and AC bus simultaneously, feeds local loads with local resources, and presents two dc voltage levels to users and resources. Interlinking converter (ILC) is the most important part of the microgrid structure due to its essential responsibilities in various applications. In this paper, a 10 switch converter is presented as an ILC for bipolar hybrid microgrid that advantages from both two and three-level converters’ benefits simultaneously, plus it is applicable to a wide variety of power ranges. This paper presents a novel space vector modulation (SVM) for 10 switch converter in order to reduce total harmonic distortion (THD) and increase the dc-link voltage utilization in comparison to prior carrier-based modulation methods. Also, a simplified, full-scale dc-link voltage balancing strategy is proposed for this converter. The performance of existing dc-link voltage balancing strategies for carrier-based modulation method which are an extension to the general control structure of a grid-tied ILC is compared to the method presented in this paper that shows the superiority of the proposed robust full-scale balancing strategy and the proposed SVM method. Moreover, the structure of grid-tied ILCs is upgraded to eliminate low order harmonics.
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