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Emission-averse techno-economical study for an isolated microgrid system with solar energy and battery storage

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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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Contributions

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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Correspondence to Maneesh Kumar.

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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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