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A hybrid control approach for regulating frequency through demand response

Malik, Anam, Ravishankar, Jayashri
Applied energy 2018 v.210 pp. 1347-1362
carbon footprint, energy, refrigerators, renewable energy sources, wind
Many countries worldwide have set ambitious targets for integrating renewable energy in their power network. Where renewable energy reduces carbon footprint, its reduced inertia makes the system susceptible to frequency deviation after disturbance. This paper presents a novel hybrid frequency regulation strategy by using domestic refrigerators as control loads. The proposed strategy uses the idea of Cooperative Home Energy Management system (CoHEM) at distribution transformers and exploits the best of both centralized and decentralized control systems. A hybrid power network setup with both diesel and wind generation is designed in Simulink so as to study the frequency profile of the system after disturbance. The effectiveness of the strategy is validated without control and with centralized control under four different scenarios. Results when compared to without controller, suggest that the proposed controller exhibits less frequency error and is able to regulate frequency faster. The results were in par with the centralized controller; however, the proposed architecture is anticipated to save time, technical cost and computational burden over a centralized controller.