University of South Wales Master of Sciences Thesis
Preliminary Sizing of the Battery bank
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- 3.3.2. Preliminary sizing of PV-arrays
| 3.3.1. Preliminary Sizing of the Battery bank
The battery bank is preliminarily sized in such a way that it is capable of storing enough energy from the renewable energy resources when there is plenty of supply. It, then, should supply the demand during low or no sun period and/or wind speed, alone or together with the RESs. The preliminary sizing of the battery capacity depends on the daily energy consumption (KWh/day). For the two different load profiles considered, the preliminary sizes of the battery banks are different and can be defined as [11, 12, 25]: 3.5 Where: - - E daily load demand the total daily energy demand (KWh/day) (refer to Appendix-A for values used) - DOD is the depth of discharge of the battery (70% is considered here) - DOS is the days of autonomous (one day of autonomous is considered here) - η is the battery efficiency (85% in this case) yielding capacities of 1.5MWh and 1.3MWh for the load profile-A and profile-B respectively. The nominal battery capacity is 1.25 times the calculated value [6]. The charging/discharging of the battery in the linear region (30% - 90% peak capacity) gives highest efficiency and controls must be designed in this manner. 3.3.2. Preliminary sizing of PV-arrays When considering only PV-arrays as energy source, the PV-arrays are sized in such a way that the daily energy from the PV-arrays (partly stored in Battery bank and /or partly directly supplied) should at least meet the average daily energy demand. The corresponding energy profile can be determined by multiplying the power supply of every 1-hour time with time giving the watt-hour. The maximum number of PV-panels is to meet the daily energy demand and it can be expressed as: 3.6 Standalone hybrid generation system for the remote area of Thar, Pakistan tải về 6.62 Mb. Chia sẻ với bạn bè của bạn:
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