Variable Load Demand Scheme for Hybrid AC/DC Nanogrid

Abstract

This paper addresses the use of nanogrid technology in resolving the issue of blanket load shedding for domestic consumers. This is accomplished by using different load management techniques and load classification and utilizing maximum solar energy. The inclusion of DC-based load in basic load and DC inverter load in regular load and scheduling of the burst load during the hours of maximum solar PV generation bring novelty in this work. The term “nanogrid” as a power structure remains ambiguous in various publications so far. An effort has been done in this paper to present a concise definition of nanogrid. Demand side load management is one of the key features of nanogrid, which enables end users to know major characteristics about their energy consumption during peak and off-peak hours. A microgrid option with nanogrid facility results in a more reliable system with overall improvement in efficiency and reduction in carbon emission. PV plants produce DC power; when used directly, the loss will automatically be minimized to 16%. The AC/DC hybrid nanogrid exhibits 63% more efficiency as compared to AC-only nanogrid and nearly 18% more efficiency as compared to DC-only nanogrid. Smart load shifting smoothens the demand curve 54% more adequately than during conventional load shifting. Simulation results show that real-time pricing is more economical than flat rate tariff for a house without DG, whereas flat rate results are more economical when DG are involved in nanogrids. 12.67%-21.46% saving is achieved if only flat rates are used for DG in nanogrid instead of real-time pricing.

Energy management system for AC/DC HMGS integrated with interconnected renewable sources and interlinking converter

“…Load shedding for domestic users is quite common in rural areas, the scheme is developed for load management for PV system for maximum power utilization [19]. Sun irradiance and temperature are the main dependents for maximum PV power output, due to variations in both PV system is considered to be nonlinear.…”

Efficiency and energy‐loss analysis for hybridAC/DCdistribution systems and microgrids: A review

“…As a result, hardware tests using the solar panel, AC‐grid, and batteries as the power sources proved that the controller operated properly. Rauf et al 97 discussed the use of AC/DC nano‐grid technology in resolving the question of blanket load shedding for domestic consumers. Numerical results showed that real‐time pricing is more economically viable than flat‐rate tariff for a house without DG, whereas flat‐rate configurations are more beneficial when DG is involved in nano‐grids.…”