Abstract
This paper proposes an optimal stochastic operation strategy for renewable energy (RE) supported isolated microgrids (IMGs). It incorporates an emission-averse model to reduce the negative impact of CO2 emission on the environment by optimally utilizing carbon capture-based technology. The emission from dispatchable sources, viz. diesel engines used to produce electrical energy, adversely affects the environment. Although imposing a penalty cost on carbon emissions reduces its production from such sources, but still, it cannot be avoided. The proposed work introduces a carbon capture-based reduced emission model that incorporates a small-scale carbon capture unit (CCU) incorporated with a fossil fuel-based unit. Depending upon the CCU system efficiency, a fractional penalty has also been imposed on carbon emissions. From the analysis point of view, the efficiency of the CCU is considered as 90%. The overall problem is formulated as a multivariable constrained cost optimization problem to obtain the optimal dispatch of various connected sources and is solved through a hybrid function approach using the ‘fmincon’ solver in the MATLAB environment. The results are analyzed for the techno-economically viability of the IMG system with different RE penetration levels and the carbon emission factor (EF). It is found that the microgrid is operated most economically with a 40% RE penetration (corresponding optimal cost is 1.521e + 03 $), and it is also obtained that with an increase in emission factor, the overall economics of the system is adversely affected considering a certain RE penetration level in the system.
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Abbreviations
- BESS:
-
Battery energy storage system
- CCREM:
-
Carbon capture-based reduced emission model
- CCU:
-
Carbon capture unit
- DG:
-
Distributed generation
- \({\text{DF}}^{{{\text{spv}}}}\) :
-
Derating factor of solar PV module
- EF:
-
Emission factor
- H :
-
Average solar insolation (kW/m2)
- \(H^{{{\text{std}}}}\) :
-
Standard solar insolation
- HF:
-
Hybrid function
- IMGs:
-
Isolated microgrids
- OM:
-
Operation and maintenance
- OMspv/deg/bess :
-
Annualized OM costs associated with SPV/DEG/BESS units ($/year)
- PSO:
-
Particle swarm optimization
- SQP:
-
Sequential quadratic programming
- S :
-
Total number of scenarios
- N :
-
Total number of Samples
- t :
-
Time index
- s :
-
Generated scenario index
- \(C^{{{\text{in}}}}\) :
-
CO2 intensity (kg/kW)
- \(C^{\max }\) :
-
Maximum allowable charging of storage unit
- \(\eta^{{{\text{ch}}}} /\eta^{{{\text{dch}}}}\) :
-
Charging/ discharging efficiencies of BESS unit
- \(C^{{\deg ,{\text{on}}/{\text{off}}}}\) :
-
Cost associated with DEG on/off
- \(C^{{\text{c}}}\) :
-
Total cost associated with CCU
- \(C^{{\text{r}}}\) :
-
Cost associated with revenue generated through CO2 storage
- \(C^{{\deg ,{\text{on}}/{\text{off}}}}\) :
-
Cost associated with DEG on/off processes
- \(N^{{{\text{spv}},{\text{bess}},\deg }}\) :
-
Number of SPV/BESS/DEG units
- \(C^{{\deg ,{\text{om}}}}\) :
-
DEG OM cost
- \(C^{{{\text{bess}},{\text{om}}}}\) :
-
Storage system OM cost
- \(C^{{{\text{bess}},{\text{loss}}}}\) :
-
Cost associated with losses in the storage system
- \(S^{{{\text{CO}}_{2} }}\) :
-
Store price of CO2 ($/kg)
- \(C^{{{\text{es}} }} \left( {s,t} \right)\) :
-
BESS unit stored energy
- \(X^{{{\text{spv}}}} \left( {s,t} \right)\) :
-
SPV output (kW)
- \(X^{{{\text{bess}}}} \left( {s,t} \right)\) :
-
BESS output (kW)
- \(X^{\deg } \left( {s,t} \right)\) :
-
DEG output (kW)
- \(X^{{{\text{ch}}}} \left( {s,t} \right)\) :
-
Charging power of BESS unit (kW)
- \(X^{c} \left( {s,t} \right)\) :
-
Operating power required by CCU (kW)
- \(X^{{{\text{dch}}}} \left( {s,t} \right)\) :
-
Discharging power of BESS unit (kW)
- \(X\left( {s,t} \right)\) :
-
Total load demand of the system (kW)
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Dr. Maneesh Kumar: Conceptualization, Writing software code, Writing- Original draft preparation Dr. Sourav Diwania: Methodology, Writing software code, Data curation. Dr. Sachidananda Sen: Conceptualization Dr. Harendra Singh Rawat: Writing software code
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Kumar, M., Diwania, S., Sen, S. et al. Emission-averse techno-economical study for an isolated microgrid system with solar energy and battery storage. Electr Eng 105, 1883–1896 (2023). https://doi.org/10.1007/s00202-023-01785-8
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DOI: https://doi.org/10.1007/s00202-023-01785-8