Online Optimization of Battery Energy Storage System Using Particle Swarm Optimization for Islanded Microgrid

The model is microgrid is given in Fig. 1 and the details of converters and Inverter is given in Fig. 2. The BESS technology needs to useLithium-ion batteryand Polysulfide-bromine. The whole system must be simulated using MATLAB/Simulink.

Activities

1. State of Charge (SoC) based Charging/Discharging Control and Overcharging/Overdischarging protection using User Define Function Block

2. Logic Define for Buck and Boost Operation using User Define Function Block

3. Minimize the Size of BESS using PSO

4. Minimize the total cost of BESS using PSO

5. MPPT controller design for PV without partial shading using Grey Wolf Optimization (The Output of MPPT should be reference voltage)

6. Explanation of Objective function for Minimizing Size of BESS

7. Explanation of Objective function for Minimizing total cost of BESS

8. Explanation of Objective function for MPPT controller

Objective Functions:

Minimize

f₁ = min(P_BESS )

f₂ = min(C_Capital )

Minimize f₃ = min(C_O&M)

The Constraints of objective functions are:

P_BESS^min  ≤ P_BESS    ≤ P_BESS^max

The Constraints of objective functions are:

P_BESS^min ≤ P_BESS ≤ P_BESS^max

where P_BESS is the rated power capacity of B_ESS (MW), P^BESS_min is the allowed minimum rated power capacity and P^BESS_max is the allowed maximum rated power capacity of BESS.

C_BESS^min   ≤ C_BESS    ≤ C_BESS^max

where C_BESS is the rated energy capacity of BESS (MW h), C^BESS_min is the allowed minimum rated energy capacity and C^BESS_max is the allowed maximum rated energy capacity of BESS

F_min ≤ F ≤ F_max

where F is the nominal frequency of the isolated microgrid (Hz.), F_min is the allowed minimum nominal frequency of the isolated microgrid and F_max is the allowed maximum nominal frequency of the isolated microgrid.

C_Capital ≤ C^max_Capital

where C_Capital is the capacity cost of BESS ($) and C^max_Capital is the maximum capacity cost of BESS ($).

C_O&M ≤ C^max_O&M

where C_O&M is the operating and maintenance cost ($/year) and C_O&M is the maximum operating andmaintenance cost ($/year).

PV data and load data is given in excel file and other parameter value student can choose himself or can take from given references.

Results:
- Convergence rate of BESS Size
- Convergence rate of Capital Cost
- Convergence rate of Operating and Maintenance cost

- Frequency deviation of microgrid with and without optimization
- Voltage deviation of microgridwith and without optimization
- Shaved Peak load during Peak period using BESS*
- Power of BESSwith and without optimization
*Shaved Peak load of given Load Data. Battery Energy Storage System (BESS) will discharge only for peak period of load for Peak shaving application.

Attachment:- PV and Load Data.xlsx