DESIGN DETAILS
Providing access to clean, reliable, and affordable energy by adopting microgrid (MG) power systems is important for sustainable development goals as the extension of the grid is time and capital expensive. Hybrid PV/Diesel MG power systems are used for off-grid electrification applications, and they are good for applications in hot climates. However, due to the CO2 emission, rising price and delivery cost of diesel fuel, renewable energy sources are becoming more and more popular in MG development, especially in remote areas. Both solar and wind power sources are intermittent as they depend on weather and climate changes; however, hybridizing the two sources can overcome this drawback. Using a hybrid ESS in an MG system can increase the system stability. The PV is used as the main power supply in the system. The WT is used as complementary power supply to support the load when the PV production is low (e.g., cloudy day) or not available (night times). Additionally, the ESS is used as a back-up power to support the load when the power generated by the PV and WT cannot handle the load demand. However, improper sizing of the system components may result in higher MG cost and low reliability. This Matlab design is to find the optimal size of PV array, WT and ESS for an off-grid MG by using an enhanced GA, to minimize the total cost of the MG.
OBJECTIVE FUNCTION
The objective of this optimization problem is to minimize the capital and operating costs of the off-grid hybrid MG is given as below,
min f(N_PV,N_WT,E_ss )=C_PV.N_PV+C_WT.N_WT+C_ESS.E_ESS
CONSTRAINTS
The following constraints are considered in the design,
Reliability
PV power limits
WT power limits
ESS stored energy and power limits
Energy balance
Power balance
REFERENCES
Reference Paper-1: Optimal Sizing of Solar/Wind Hybrid Off-Grid Microgrids Using an Enhanced Genetic Algorithm
Author’s Name: Abdrahamane Traoré, Hatem Elgothamy and, Mohamed A. Zohdy
Source: Journal of Power and Energy Engineering
Year: 2018
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