Abstract
This paper proposes a quadratic convex model for optimal operation of battery energy storage systems in a direct current (DC) network that approximates the original nonlinear non-convex one. The proposed quadratic convex model uses Taylor’s series expansion to transform the product between voltage variables in the power balance equations into a linear combination of them. Numerical simulations in the general algebraic modeling system (GAMS) for both models show small differences in the daily energy losses, which are lower than \(3.00\%\). The main advantage of the proposed quadratic model is that its optimal solution is achievable with interior point methods guaranteeing its uniqueness (convexity properties of the solution space and objective function), which is not possible to guarantee with the exact nonlinear non-convex model. The 30-bus DC test feeder with four distributed generators (with power generation forecast via artificial neural networks with errors lower than \(1\%\) between real and predicted generation curves) and three batteries is used to validate the proposed convex and exact models. Numerical results obtained by GAMS show the effectiveness of the proposed quadratic convex model for different simulation scenarios tested, which was confirmed by the CVX tool for convex optimization in MATLAB.
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Abbreviations
- \(\Delta {t}\) :
-
Length of the period of time where the loads are constants (h)
- \({\mathcal {N}}\) :
-
Set that contains all the nodes of the network
- \({\mathcal {T}}\) :
-
Set that contains all the nodes of the periods of time
- \(CoE_{t}\) :
-
Cost of the energy in period t (COP$/Wh)
- \(G_ij\) :
-
Conductance value that associates nodes i and j (\(\Omega ^{-1}\))
- \(p^{{\rm max}}_i,t\) :
-
Maximum bound of the power generated in the conventional source connected at node i in the period t (W)
- \(p^{{\rm min}}_i,t\) :
-
Minimum bound of the power generated in the conventional source connected at node i in the period t (W)
- \(p^{{\rm b,max}}_i\) :
-
Maximum discharge capability of a battery connected at node i (W)
- \(p^{{\rm b,min}}_i\) :
-
Minimum charge capability of a battery connected at node i (W)
- \(p^{{\rm b}}_i,t\) :
-
Power injected/absorbed in the battery connected at node i in the period t (W)
- \(p^{dg}_i,t\) :
-
Power generated in the distributed generator connected at node i in the period t (W)
- \(p^{d}_i,t\) :
-
Power demanded in node i in the period t (W)
- \(p_{i,t}\) :
-
Power generated in the conventional source connected at node i in the period t (W)
- \(SoC^{{\rm b,max}}_i\) :
-
Maximum bound of the state of charge of the battery in the ith node (pu)
- \(SoC^{{\rm b,min}}_i\) :
-
Minimum bound of the state of charge of the battery in the ith node (pu)
- \(SoC^{{\rm b,fin}}_i\) :
-
Final state of charge of the battery in the \(i^th\) node (pu)
- \(SoC^{{\rm b,ini}}_i\) :
-
Initial state of charge of the battery in the ith node (pu)
- \(SoC^{{\rm b}}_i,t\) :
-
state of charge of the battery in the ith node at the t th time period (pu)
- \(v^{{\rm max}}_i\) :
-
Maximum voltage regulation bound at node i (V)
- \(v^{{\rm min}}_i\) :
-
Minimum voltage regulation bound at node i (V)
- \(v_i,t\) :
-
Voltage value at node i at the period of time t (V)
- \(v_i,t\) :
-
Voltage value at node j at the period of time t (V)
- z :
-
Value of the objective function regarding the costs of the energy losses (COP$/day)
- \(\mathbf{BESS}\) :
-
Battery energy storage system
- \(\mathbf{GAMS}\) :
-
General algebraic modeling system
- \(\mathbf{NLP}\) :
-
Nonlinear programming
- \(p^{{\rm dg,max}}_i,t\) :
-
Maximum bound of the power generated in the distributed generator connected at node i in the period t (W)
- \(p^{{\rm dg,max}}_i,t\) :
-
Minimum bound of the power generated in the distributed generator connected at node i in the period t (W)
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Montoya, O.D., Arias-Londoño, A., Garrido, V.M. et al. A quadratic convex approximation for optimal operation of battery energy storage systems in DC distribution networks. Energy Syst 14, 985–1005 (2023). https://doi.org/10.1007/s12667-021-00495-z
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DOI: https://doi.org/10.1007/s12667-021-00495-z