Analysis of flexible load regulation capability in electric heating system with phase-change for energy storage using photovoltaic and grid power
With the leapfrog development of renewable energy in China,the problem of new energy electric power utilization has become increasingly prominent.This paper,constructs an electric and photovoltaic complementary electric heating system with phase-change thermal energy storage,and a mathematical model of the thermal performance of the system is constructed,which can reflect the dynamic thermal performance of the indoor thermal environment of the system,and the control strategy of the flexible thermoelectric load regulation of the system is designed.A case study was carried out on a low-carbon building in Beijing,and the load transfer capacity and photovoltaic absorption capacity of the system were simulated and studied.The results show that the system with this rooftop photovoltaic was able to reduce the peak electricity consumption of the case building by 93.9% and the primary energy consumption by 23.9%,with the indoor temperature being maintained at 18℃.In this study,the peak power consumption can be reduced by 75.1% to 97.4% compared to the system without PV using different PV installed capacity installation methods and areas,and the improvement of the storage capacity has a significant effect on the improvement of the system's flexible load transfer capability,and the improvement effect gradually decreases when the storage battery capacity is larger than 15 kW·h.
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