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Item type:Publication, Unsupervised learning for deploying smart charging public infrastructure for electric vehicles in sprawling cities(Elsevier, 2020-09-01)This paper presents a novel methodology to study the deployment of public smart charging stations (CS) of electric vehicles (EV) in a sprawling Latin American city. A relevant difference between developed and emerging economies is the reduced access to home charging in emerging economies, which is the case in Latin American cities. Thus, developing public charging stations represents a crucial factor in the mass adoption of EVs by road commuters. We develop herein a methodology for optimizing the deployment of smart charging stations under the sprawling phenomenon perspective. Our method comprises two steps. In step one, we applied principal component analysis (PCA) to facilitate the analysis of a sprawling city, and then we define candidates for potential locations from ‘demand clusters’ within an urbanized area, by K-means clustering analysis. In the second step, a stochastic programming model was employed to optimize the integration of infrastructural facilities with distributed energy resources (DERs) and EV charging stations using a collaborative strategy to minimize its energy consumption cost under demand uncertainty. We demonstrate the capabilities of this approach through a case study in the city of Lima. Experimental results reveal managerial insights for different stakeholders (i.e., government, industry, academia, and civil society) to promote policies, investment, and incentives. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A microgrid energy management system based on chance-constrained stochastic optimization and big data analytics(Elsevier, 2020-05-01)A Microgrid (MG) is a promising distributed technology to solve todays energy challenges. They are changing how electricity is produced, transmitted, and distributed, enabling to capture massive amounts of data from sensors, and other electrical infrastructures. However, recent advances in modeling and optimization of MG neither integrate the use of big data technologies aggressively nor focus on developing an optimal operational strategy for a single building. To bridge this gap, this research proposes to use Apache Spark to enhance the performance of a scalable stochastic optimization model for an MG for multiple buildings, and to ensure that a significant portion of the wind power output will be utilized. The decision model is formulated as a chance constraint two-stage optimization problem to obtain operation decisions for a behind-the-meter topology. The comparison between the current practice of using historical data and integrating Apache Spark technologies demonstrates the superiority of the streaming data as energy management strategy. Experiments under different settings show that using big data strategy, the model can (1) achieve more cost savings of the total system, (2) increase resiliency to power disturbances, and (3) build a data analytics framework to enhance the decision-making process. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Electric vehicles fast charger location-routing problem under ambient temperature(Springer Science+Business Media, 2021-10-31)This study investigates how the location-routing decisions of the electric vehicle (EV) DC Fast Charging (DCFC) charging stations are impacted by the ambient temperature.Electric vehicles are expected to contribute significantly to the delivery mission of logistic companies in the future. In an EV delivery logistics network equipped with DCFC stations, this study investigates how the location strategy of DCFC charging stations and the routing plan of a fleet of EVs are impacted by the ambient temperature. We formulated this problem as a mixed-integer linear programming model that captures the realistic charging behavior of the DCFC’s in association with the ambient temperature and their subsequent impact on the EV charging station location and routing decisions. Two innovative heuristics are proposed to solve this challenging model in a realistic test setting, namely, the two-phase Tabu Search-modified Clarke and Wright algorithm and the Sweep-based Iterative Greedy Adaptive Large Neighborhood algorithm. We use Fargo city in North Dakota as a testbed to visualize and validate the algorithm performances. The results clearly indicate that the EV DCFC charging station location decisions are highly sensitive to the ambient temperature, the charging time, and the initial state-of-charge. The results provide numerous managerial insights for decision-makers to efficiently design and manage the DCFC EV logistic network for cities that suffer from high-temperature fluctuations. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, AWS IoT analytics platform for microgrid operation management(Elsevier Ltd, 2022-08-01)Microgrid (MG) represents a promising opportunity for integrating renewable energy systems with the electric power grid. However, numerous complexities need to be addressed in the process. The electrical grid is complex, vulnerable, and centralized. Thus, the integration is challenging owing to the stochastic nature of renewable energy generation, which affects the possibility of reliable forecasting. The wastage due to poor estimation of clean energy generation discourages new investments in this area. However, recent advancements in big data technologies enable processing a large amount of data captured from multiple sources in real-time. It opens the possibility of improving the operational optimization of MGs and the performance of forecasting models. The overall MG problem is formulated using a two-stage stochastic mixed-integer linear programming problem with recourse. Amazon Web Services (AWS) IoT analytics platform inputs data in real-time and runs a sophisticated wind generation forecast analysis. The stochastic model is solved using the Sample Average Approximation (SAA) algorithm. The innovative methodology leads to significant improvements in the total average operating cost by integrating AWS IoT Analytics compared to traditional methods that use historical data. Computations are performed for different power-grid settings, including a power-outage, and different power generators units capacities with total operation average cost savings of 7.6% and 5.9%, respectively. Sensitivity analysis showed that the SSA algorithm could solve all the instances by providing high-quality solutions. The AWS IoT strategy outperformed at 7.7 % and 3.6% for optimality gap and CPU time, respectively. We examined an actual case in Peru for an agricultural application to assess the performance of a stochastic optimization model with a real-time IoT wind generation forecast strategy. The results revealed the following capabilities of our novel framework: (1) it can realize higher cost savings from the MG operating systems; (2) improve real-time renewable energy forecasting; (3) facilitate robust decision-making under conditions of uncertainty.