Does the size really matter ?
Alireza Soroudi, PhD
Lead Data Scientist @ bluecrux || SMIEEE || Optimization expert in Supply chain management|| Healthcare management || Lab Digitalization || Power and Energy systems || Developer || Author / Speaker || (views are mine)
The energy storage can be used to resolve some challenges in day to day power system operation. These challenges include:
The question is:
Should we use a large storage unit to improve the power system's performance? or a number of smaller units but scattered throughout the network will do the job?
The optimal power flow is formulated in Pyomo and the impact of one 800 MWh storage located in different locations is investigated on the overall costs as well as the total wind curtailments. It is formulated as a MILP problem and solved using cbc solver. The network under study is IEEE 118 bus system.
The following graph shows that some locations can better host the energy storage and influence the objective function. So
The Energy Storage's connection point is important and should be optimally determined.
Now, suppose instead of 800 MWh we do have 700MWh in 100 MWh blocks. IS it possible to allocate them optimally to get the same results ? Or even better results ?
The simulation shows that if 600 or 700 MWh of energy storage is optimally allocation in the grid they can even provide a better result compared to single 800 MWh case.
So the answer is yes and no. By optimally allocating the energy storages in a given power system, the same performance can be exploited even if a set of smaller storage units are used (with less total capacity).
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Some previously published Power System Optimization problems are:
Associate Professor of Power Systems
2 年Riccardo Trevisan
Data Scientist | Senior ML Engineer - Tech Lead at Electricity Maps
2 年Dear Alireza, This is a very useful analysis. It is actually an important topic and discussion when it comes to implementing ESS in distribution networks for congestion management and flexibility services. There, and also as part of my PhD we could also get to the same conclusion that is quite "crutial" the node where the ESS is placed, in terms of congestion management/voltage control. I have two questions: Is it possible to access the source code/mathematical formulation? It would be extremely helpful. As far as I know, this MILP problem could also be solved using CPLEX or gurobi solvers (Maybe I am wrong). What are the benefits/advantages of using cbc?
Field Engineer
2 年Yes
R&D and Innovation Manager
2 年Dear Alireza is it possible to simulate with your algorithm the case in which 1 MWh were divided into 250 residential storages with single 4 KWh capacity, sharing the results obtained?