首页|Study on accurate regulation of power consumption in self-supporting time of off-grid system in Haikou
Study on accurate regulation of power consumption in self-supporting time of off-grid system in Haikou
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NSTL
In practical engineering, Off-grid PV systems have failed to meet user requirements due to the absence ofprecise local weather parameters and unverified battery charging times. In this study, off-grid solar streetlights in a village in Haikou were taken as an example. A three-year monitoring period was conductedusing a local PV station. It was observed that in this area, the lowest solar radiation is typically recordedfrom December to January. Over three years, there were four instances of continuous overcast and rainyweather, with the longest period lasting up to 9 days. During these 9 days, the daily average power generationper kilowatt of PV module fluctuated between 0.46 and 0.92 kW. Based on this data, a theoreticalformula for the optimal daily power consumption was derived, and it was determined that 180W and 240Wwere the optimal power consumption levels for continuous overcast and rainy weather. The charging timefor the batteries was verified to be 4 days. Finally, practical validation was conducted using the village’ssolar street lights, confirming that the optimal power consumption during continuous overcast and rainydays was 180W, and during continuous overcast days, it was 230W. These research findings hold significantimportance.
Energy and power engineeringoff-grid power stationnumber of days of self-sufficiencyaccumulator capacitydepth of dischargeinterval coefficient
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