An Analysis and Comparison of Battery Size Selection and Economic Worthiness of Two Industrial Plants based on Electricity-generating from Solar Power for Self-Consumption
Keywords:
Battery, Economic Worthiness, Electricity Generating, Solar EnergyAbstract
Industrial plants in Thailand have invested in the installation of the system of electricity-generating from solar energy for self-consumption. Sometimes, it has the excess power supply which could have a reverse power flow to the electrical system of the Provincial Electricity Authority. This is because some industrial plants install the electrical generation system which is more than the actual load or some periods of time that an industrial plant reduces energy uses. Consequently, this influences lack of power quality and its characteristic does not comply with power network system interconnection code of the Provincial Electricity Authority. However, it can be solved by the installation of appropriate battery sizes.
The purposes of this paper are to reduce reverse power generating from solar PV of industrial factory to PEA’s system and to decrease energy losses in term of self-consumption. This article analyses energy losses of electrical generation system from solar PV power, selection of appropriate battery size and its economic worthiness. Data from two industrial plants are analyzed based on electrical consumption patterns. The industrial plant 1 uses electricity during weekdays which is more than weekend whereas the industrial plant 2 uses an amount of electricity during weekend and weekdays which is almost the same. The analysis results show that factory 1 should select battery size of 34 kWh and factory 2 is able to choose battery size of 143 kWh or 268 kWh. This is because it can reduce impacts on power quality due to reserve power and strengthen system stability of the Provincial Electricity Authority. Also, it can generate increased revenue to the organization by selling the electricity surplus.
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