Abstract
Currently, the microgrid operators try to operate this special type of the electrical grid in an optimal way due to the energy and cost saving and enhancing the other technical, environmental and economic aspects. Two of the most important tasks of operators to improve the efficiency of the microgrid are the optimal unit commitment and the distribution feeder reconfiguration. If these tasks are individually carried out, it may not lead to the optimal operation. Simultaneously, performing these two tasks in an unbalanced microgrid is a challenging multi-objective problem that this paper is faced with it. The assumed unbalanced microgrid has been equipped by two hybrid energy systems which include the dispatchable distributed generations that are fuel cell units and the non-dispatchable ones that are wind turbines and photovoltaic cells. The stochastic behavior of the non-dispatchable generation units and electrical demand is modeled by a stochastic copula scenario-based framework. The objective functions are minimization of the operational cost of the microgrid, minimization of active power loss, maximization of voltage stability index, minimization of emissions, and minimization of the voltage and current unbalance indices subject to diverse technical constraints. The proposed multi-objective problem is optimized by multi-objective covariance matrix adaption-evolution strategy (MOCMA-ES) algorithm, and a set of Pareto solutions is achieved. The best compromised solution is then chosen by using the fuzzy technique. The capability of the proposed model is investigated on an unbalanced 25-bus microgrid. The simulation results show the efficacy of the proposed model to optimize objective functions, while the constraints are satisfied.
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Abbreviations
- \(N_{{{\text{BR}}}}\) :
-
Set of branches
- \(N_{{\rm DG_{{ND}} }}\) :
-
Set of non-dispatchable DGs
- \(N_{{\rm DG_{D} }}\) :
-
Set of dispatchable DGs
- \(N_{{{\text{bus}}}}\) :
-
Set of buses\(N_{p}\)
- \(S\) :
-
Set of scenarios
- \(N_{p}\) :
-
Set of populations
- \(D\) :
-
Set of decision variables
- \(K\) :
-
Set of iterations
- \(P\) :
-
Set of phases
- \(P_{{{\text{loss}}}} \left( s \right)\) :
-
Active power loss and \(s\)th scenario (kW)
- \(I^{i} \left( {k\,s} \right)\) :
-
Current \(i\)th phase in \(k\)th branch and \(s\)th scenario (A)
- \({\text{VSI}}_{r} \left( s \right)\) :
-
Voltage stability index for \(r\)th bus and \(s\)th scenario (pu)
- \(V_{z}^{i} \left( s \right)\) :
-
Voltage for \(z\)th bus in \( i\)th phase and \(s\)th scenario (pu)
- \(P_{zr}^{i} \left( s \right)\) :
-
Active power between \(z\)th and \(r{\rm th}\) buses in \( i\)th phase and \(s\)th scenario (pu)
- \(Q_{zr}^{i} \left( s \right)\) :
-
Reactive power between \(z\)th and \(r{\rm th}\) buses in \( i\)th phase and \(s\)th scenario (pu)
- \(C_{{{\text{grid}}}} \left( s \right)\) :
-
Cost of energy exchanged with upstream grid and \(s\)th scenario ($)
- \(i,s)\) :
-
Cost of active power generated by \(i\)th non-dispatchable DG ($)
- \(C_{{\rm DG_{D} }} \left( {j,s} \right)\) :
-
Cost of active power generated by \(j\)th dispatchable DG and \(s\)th scenario ($)
- \(P_{{{\text{grid}}}} \left( s \right)\) :
-
Active power exchanged with upstream grid (kW)
- \(P_{{\rm DG_{{ND}} }} \left( {i,s} \right)\) :
-
Active power generated by \(i\)th non-dispatchable DG and \(s\)th. scenario (kW)
- \(P_{{\rm DG_{D} }} \left( {j,s} \right)\) :
-
Active power generated by \(j\)th dispatchable DG and \(s\)th scenario (kW)
- \({\text{TVUF}}\left( s \right)\) :
-
Total voltage unbalance factor in \(s\)th scenario
- \(V_{2}^{r} \left( s \right)\) :
-
Negative sequence of voltage in \(r\)th bus and \(s\)th scenario (pu)
- \(V_{1}^{r} (s\)):
-
Positive sequence of voltage in \(r\)th bus and \(s\)th scenario (pu)
- \({\text{TCUF}}\left( s \right)\) :
-
Total current unbalance factor in \(s\)th scenario
- \(I_{2}^{k} \left( s \right)\) :
-
Negative sequence of current in \(k\)th branch and \(s\)th scenario (pu)
- \(I_{1}^{k} (s\)):
-
Positive sequence of current in \(k\)th branch and \(s\)th scenario (pu)
- \(f_{i} \left( s \right)\) :
-
Value of \(i\)th objective function and \(s\)th. scenario
- \( f_{i}^{{\min}}\) :
-
Nadir value for \(i\) th objective function
- \( f_{i}^{{\max}}\) :
-
Ideal value for \(i\) th objective function
- \(a_{i} \left( s \right)\) :
-
Fuzzy membership for \(i\) th objective function and \(s\)th scenario
- \({\text{PG}}\left( {i,s} \right)\) :
-
Generated active power in \(i\) th bus and \(s\)th scenario (pu)
- \({\text{PD}}\left( {i,s} \right)\) :
-
Demanded active power in \(i\) th bus and \(s\)th scenario (pu)
- \(\left| {V\left( {i,s} \right)} \right|\) :
-
Magnitude of voltage in \(i\) th bus and \(s\)th scenario (pu)
- \(\delta \left( {i,s} \right)\) :
-
Phase voltage in \(i\) th bus and \(s\)th scenario (pu)
- \(\left| {Y\left( {i,j} \right)} \right|\) :
-
Magnitude of admittance of between \(i\) th and \(j\)th bus (pu)
- \(\varphi \left( {i,j,s} \right)\) :
-
Phase of admittance of between \(i\)th and \(j\)th bus (pu)
- \({\text{QG}}\left( {i,s} \right)\) :
-
Generated reactive power in \(i\)th bus and \(s\)th scenario (pu)
- \({\text{QD}}\left( {i,s} \right)\) :
-
Demanded reactive power in \(i\)th bus and \(s\)th scenario (pu)
- \(\left| {I\left( {i,j,s} \right)} \right|\) :
-
Magnitude of current of between \(i\)th and \(j\)th bus and \(s\)th scenario (pu)
- \(X_{j}^{{\left( {k,i} \right)}}\) :
-
\(j\)th candidate solution for \(i\)th particle in \(k\)th iteration
- \(V_{j}^{{\left( {k,i} \right)}}\) :
-
\(j\)th element of velocity vector for \(i\)th particle in \(k\)th iteration
- \({\text{Gbest}}_{j}^{\left( k \right)}\) :
-
Global best position all of candidate solution found up to \(k\)th iteration
- \({\text{Pbest}}_{j}^{{\left( {k,i} \right)}}\) :
-
Best previous experience for \(i\)th particle in \(k\)th iteration
- \(\psi_{r} \left( {X,Y} \right)\) :
-
Rank correlation
- \(G_{X} \left( X \right)\) :
-
Calmative distribution function (CDF) of \(X\) random variable
- \(G_{Y} \left( Y \right)\) :
-
Calmative distribution function (CDF) of \(Y\) random variable
- \({\text{Cov}}\left( {G_{X} ,G_{Y} } \right)\) :
-
Covariance of \(G_{X}\) and \(G_{Y} .\)
- \(\sigma \left( {G_{X} } \right)\) :
-
Standard deviation of \(G_{X}\)
- \(\sigma \left( {G_{Y} } \right)\) :
-
Standard deviation of \(G_{Y}\)
- \(R^{i} \left( k \right)\) :
-
Resistance \(i\)th phase of \(k\)th branch (\({\Omega }\))
- \(R_{zr}^{i}\) :
-
Resistance \(i\)th phase between \(z\)th and \(r{\rm th}\) buses (pu)
- \(X_{zr}^{i}\) :
-
Reactance \(i\)th phase between \(z\)th and \(r{\rm th}\) buses (pu)
- \(\rho_{{{\text{grid}}}} \left( t \right) \) :
-
Price of electricity in the upstream market at \(t\)th hour ($/kW)
- \(a_{{\rm DG_{{ND}} }} \left( i \right)\) :
-
Investment (fix) cost of \(i\)th non-dispatchable DG ($)
- \(b_{{\rm DG_{{ND}} }} \left( i \right)\) :
-
Variable cost of \(i\)th non-dispatchable DG ($)
- \(a_{{\rm DG_{D} }} \left( i \right)\) :
-
Investment (fix) cost of \(i\)th dispatchable DG ($)
- \(b_{{\rm DG_{D} }} \left( i \right)\) :
-
Variable cost of \(i\)th non-dispatchable DG ($)
- \(\eta_{{{\text{ele}}}}\) :
-
Electrical efficiency of dispatchable DGs
- \({\rm Cost_{Capital }^{{DG}}}\) :
-
Capital cost of DGs ($/kW)
- \(P_{\rm {Capacity}^{DG}}\) :
-
Capacity of DGs (kW)
- \({\text{Gr}}\) :
-
Annual rate of benefit
- \(CF_{{{\text{DG}}}} \left( i \right)\) :
-
Capacity factor of \(i\)th DG
- \(T_{{{\text{Life}}}}\) :
-
Lifetime of DGs (year)
- \({\rm Cost_{{DG_{D} }}^{O\& M}}\) :
-
Cost of operation and maintenance of dispatchable DGs ($/kW)
- \({\rm Cost_{{ DG_{D} }}^{ Fuel} }\) :
-
Cost of fuel of dispatchable DG ($/kW)
- \({\rm Cost_{{DG_{ND}}}^{O\& M} }\) :
-
Cost of operation and maintenance of non-dispatchable DGs ($/kW)
- \(\rho_{{{\text{gas}}}}\) :
-
Price of natural gas in the upstream market ($/\({\text{m}}^{3}\))
- \(\beta_{{{\text{gas}}}}\) :
-
Rate of exchanging natural gas to electricity (\({\text{m}}^{3}\)/kW)
- \({\text{ER}}\left( j \right)\) :
-
Emission rate of \(j\)th DG (kg/kW)
- \({\rm ER_{{grid}}}\) :
-
Emission rate of grid (kg/kW)
- \(I_{ij}^{{\max}}\) :
-
Permitted current of feeder or cable between \(i\)th and \(j\)th bus (pu)
- \(V_{{\min}}\) :
-
Maximum allowable voltage in each bus (pu)
- \(V_{\max }\) :
-
Minimum allowable voltage in each bus (pu)
- \(P_{\rm {DG_{D} }}^{{\min}} \left( i \right)\) :
-
Minimum allowable active power generated by \(i\)th dispatchable DG (kW)
- \(P_{{\rm DG_{D} }}^{{\max}} \left( i \right)\) :
-
Maximum allowable active power generated by \(i\)th dispatchable DG (kW)
- \({\text{VUF}}^{{\max}}\) :
-
Maximum allowable voltage unbalance at each bus
- \({\text{CUF}}^{{\max}}\) :
-
Maximum allowable current unbalance at each branch
- \(r_{1} , r_{2} \) :
-
Random number from the Gaussian distribution
- \(c_{1} , c_{2}\) :
-
Inertia coefficients
- \({\text{si}}\) :
-
Solar irradiance (\({\text{(kW}}/{\text{m}}^{2} )\)
- \(f_{b} \left( {{\text{si}}} \right)\) :
-
Beta PDF of \({\text{si}}\)
- \(\alpha_{s}\) :
-
Parameters of the Beta PDF
- \(\beta_{s}\) :
-
Parameters of the Beta PDF
- \(\mu_{s}\) :
-
Mean of forecasted solar irradiance (\({\text{kW}}/{\text{m}}^{2} )\)
- \(\sigma_{s}\) :
-
Standard deviation of forecasted solar irradiance (\({\text{kW}}/{\text{m}}^{2} )\)
- \(\eta^{{\text{pv}}}\) :
-
Efficiency of PV module
- \(S^{{\text{pv}}}\) :
-
Area of PV module (\(({\text{m}}^{2} )\)
- \(P_{{\text{rated}}}\) :
-
Rated output power of WT (kW)
- \(v_{r}\) :
-
Rated wind speed (m/s)
- \(v\) :
-
Wind speed (m/s)
- \(v_{ct}\) :
-
Cut-in wind speed (m/s)
- \(v_{co}\) :
-
Cut-out wind speed (m/s)
- \(\mu_{d}\) :
-
Mean of forecasted electrical demand (kW)
- \(\sigma_{d}\) :
-
Standard deviation of forecasted electrical demand (kW)
- \(z\) :
-
a vector of random variables between zero and one
- \(\rho \left( s \right)\) :
-
Probability of scenario s
- ASO:
-
Average stochastic output
- CDF:
-
Cumulative distribution function
- DFR:
-
Distribution feeder reconfiguration
- DG:
-
Distributed generation
- FC:
-
Fuel cell
- MOCMA-ES:
-
Multi-objective covariance matrix adaption-evolution strategy
- MG:
-
Microgrid
- MGO:
-
Microgrid operator
- MOP:
-
Multi-objective problem
- CMA-ES:
-
covariance matrix adaption-evolution strategy
- MGO:
-
Microgrid operator
- MLP:
-
Multi-layer perceptron
- O&M:
-
Operation and maintenance
- PV:
-
Photovoltaic
- PDF:
-
Probability distribution function
- PSO:
-
Particle swarm optimization
- SOP:
-
Single-objective problem
- VSI:
-
Voltage Stability Index (VSI)
- WT:
-
Wind turbine
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Fakharian, A., Sedighizadeh, M. & Khajehvand, M. Optimal Operation of Unbalanced Microgrid Utilizing Copula-Based Stochastic Simultaneous Unit Commitment and Distribution Feeder Reconfiguration Approach. Arab J Sci Eng 46, 1287–1311 (2021). https://doi.org/10.1007/s13369-020-04965-x
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DOI: https://doi.org/10.1007/s13369-020-04965-x