V. Indra Gandhi

Bio: V. Indra Gandhi is an academic researcher. The author has contributed to research in topics: Microgrid. The author has an hindex of 1, co-authored 1 publications receiving 1 citations.

Autonomous Control of Interlinking Converters with Energy Storages in Hybrid AC-DC Microgrids

Abstract: The coexistence of ac and dc subgrids in a hybrid microgrid is likely given that modern distributed sources can either be ac or dc. Linking these subgrids is a power converter, whose topology should preferably be not too unconventional. This is to avoid unnecessary compromises to reliability, simplicity, and industry relevance of the converter. The desired operating features of the hybrid microgrid can then be added through this interlinking converter. To demonstrate, an appropriate control scheme is now developed for controlling the interlinking converter. The objective is to keep the hybrid microgrid in autonomous operation with active power proportionally shared among its distributed sources. Power sharing here should depend only on the source ratings and not their placements within the hybrid microgrid. The proposed scheme can also be extended to include energy storage within the interlinking converter, as already proven in simulation and experiment. These findings have not been previously discussed in the literature, where existing schemes are mostly for an ac or a dc microgrid, but not both in coexistence.

Implementation of hardware‐in‐loop for DC‐link voltage balancing in hybrid ac/dc microgrid using interlinking converter

Abstract: Bipolar hybrid ac/dc microgrid (MG) controls a DC and AC bus at the same time, supplies local loads with local resources, and offers multiple levels of dc voltages to resources and services. The applications are getting more popular in power systems. Due to its vital tasks in numerous applications, the interlinking converter (ILC) is an utmost crucial portion of the MG system. From this study, a 10‐switch converter is provided as an ILC for a hybrid MG, which gains from both two‐level (2L) and three‐level (3L) converters at the same time, and it can be used to a wider range of power levels. This work provides a space vector modulation (SVM) for a 10‐switch converter to maximize dc‐link voltage consumption and minimize total harmonic distortion (THD) compared with other modulation techniques. The behaviour of the suggested SVM is compared with that of sinusoidal PWM. The suggested SVM was evaluated using OPAL‐RT to show that it used DC bus voltage more reliably and produced significantly less THD than existing techniques. Furthermore, grid‐tied ILC's architecture is improved to reduce low‐order harmonics and used for dc‐link voltage balancing. A real‐time (RT) digital simulator (OP‐5700) was used to test the inverter control technique. In MG, this hardware‐in‐the‐loop simulation provides an excellent environment for designing and verifying system‐level control algorithms. Simulations were run in a MATLAB/Simulink environment and confirmed using an RT simulator to validate the feasibility of the suggested topology.