Search Results for author: Ram Rajagopal

Found 41 papers, 7 papers with code

EV-EcoSim: A grid-aware co-simulation platform for the design and optimization of electric vehicle charging infrastructure

no code implementations9 Jan 2024 Emmanuel Balogun, Elizabeth Buechler, Siddharth Bhela, Simona Onori, Ram Rajagopal

In this work, we present EV-EcoSim, a co-simulation platform that couples electric vehicle charging, battery systems, solar photovoltaic systems, grid transformers, control strategies, and power distribution systems, to perform cost quantification and analyze the impacts of electric vehicle charging on the grid.

Decision Making Decision Making Under Uncertainty

SkyScript: A Large and Semantically Diverse Vision-Language Dataset for Remote Sensing

1 code implementation20 Dec 2023 Zhecheng Wang, Rajanie Prabha, Tianyuan Huang, Jiajun Wu, Ram Rajagopal

Remote sensing imagery, despite its broad applications in helping achieve Sustainable Development Goals and tackle climate change, has not yet benefited from the recent advancements of versatile, task-agnostic vision language models (VLMs).

Attribute Cross-Modal Retrieval +3

Improving the Load Flexibility of Stratified Electric Water Heaters: Design and Experimental Validation of MPC Strategies

no code implementations7 Dec 2023 Elizabeth Buechler, Aaron Goldin, Ram Rajagopal

In this work, we analyze how modeling tank stratification in an MPC formulation impacts control performance for stratified electric water heaters under time-of-use (TOU) rates.

energy management Model Predictive Control

Coordination of DERs for Grid Reliability via Day-ahead Demand-Supply Power Bounds

no code implementations1 Jul 2023 Thomas Navidi, Abbas El Gamal, Ram Rajagopal

A local controller at each consumer node then determines the DER power injections which satisfy the consumer's objectives while obeying its supply bounds.

Coordinating Distributed Energy Resources for Reliability can Significantly Reduce Future Distribution Grid Upgrades and Peak Load

no code implementations14 Jun 2023 Thomas Navidi, Abbas El Gamal, Ram Rajagopal

Current DER coordination schemes, such as demand-response and VPPs, aim to reduce electricity costs during peak demand events with no consideration of distribution grid reliability.

Empirical Exploration of Zone-by-zone Energy Flexibility: a Non-intrusive Load Disaggregation Approach for Commercial Buildings

no code implementations25 Apr 2023 Maomao Hu, Ram Rajagopal, Jacques A. de Chalendar

Moreover, a small number of zones accounted for a large amount of energy use and energy flexibility; and the most energy-intensive zones are not necessarily the most energy-flexible zones.

Total Energy

Dynamic locational marginal emissions via implicit differentiation

no code implementations28 Feb 2023 Lucas Fuentes Valenzuela, Anthony Degleris, Abbas El Gamal, Marco Pavone, Ram Rajagopal

The method is model agnostic; it can compute LMEs for any convex optimization-based dispatch model, including some of the complex dispatch models employed by system operators in real electricity systems.

Detecting Neighborhood Gentrification at Scale via Street-level Visual Data

no code implementations4 Jan 2023 Tianyuan Huang, Timothy Dai, Zhecheng Wang, Hesu Yoon, Hao Sheng, Andrew Y. Ng, Ram Rajagopal, Jackelyn Hwang

Neighborhood gentrification plays a significant role in shaping the social and economic well-being of both individuals and communities at large.

valid

Effect of State of Charge Uncertainty on Battery Energy Storage Systems

no code implementations4 Aug 2022 Sonia Martin, Simona Onori, Ram Rajagopal

Battery energy storage systems (BESSs) provide many benefits to the electricity grid, including stability, backup power, and flexibility in introducing more clean energy sources.

Estimating building energy efficiency from street view imagery, aerial imagery, and land surface temperature data

no code implementations5 Jun 2022 Kevin Mayer, Lukas Haas, Tianyuan Huang, Juan Bernabé-Moreno, Ram Rajagopal, Martin Fischer

Current methods to determine the energy efficiency of buildings require on-site visits of certified energy auditors which makes the process slow, costly, and geographically incomplete.

Constructing dynamic residential energy lifestyles using Latent Dirichlet Allocation

no code implementations22 Apr 2022 Xiao Chen, Chad Zanocco, June Flora, Ram Rajagopal

In this research, we propose and test a new framework for understanding residential electricity demand by using a dynamic energy lifestyles approach that is iterative and highly extensible.

Attribute

NeuralProphet: Explainable Forecasting at Scale

1 code implementation29 Nov 2021 Oskar Triebe, Hansika Hewamalage, Polina Pilyugina, Nikolay Laptev, Christoph Bergmeir, Ram Rajagopal

NeuralProphet is a hybrid forecasting framework based on PyTorch and trained with standard deep learning methods, making it easy for developers to extend the framework.

Decision Making Philosophy +3

EVGen: Adversarial Networks for Learning Electric Vehicle Charging Loads and Hidden Representations

no code implementations9 Aug 2021 Robert Buechler, Emmanuel Balogun, Arun Majumdar, Ram Rajagopal

The nexus between transportation, the power grid, and consumer behavior is more pronounced than ever before as the race to decarbonize the transportation sector intensifies.

Joint Optimization of Autonomous Electric Vehicle Fleet Operations and Charging Station Siting

no code implementations1 Jul 2021 Justin Luke, Mauro Salazar, Ram Rajagopal, Marco Pavone

Charging infrastructure is the coupling link between power and transportation networks, thus determining charging station siting is necessary for planning of power and transportation systems.

Large-Scale Scenarios of Electric Vehicle Charging with a Data-Driven Model of Control

1 code implementation25 May 2021 Siobhan Powell, Gustavo Vianna Cezar, Elpiniki Apostolaki-Iosifidou, Ram Rajagopal

We illustrate the methodology by generating scenarios for California's 2030 charging demand including multiple charging segments and controls, with scenarios run locally in under 50 seconds, and for assisting rate design modeling the large-scale impact of a new workplace charging rate.

Learning Neighborhood Representation from Multi-Modal Multi-Graph: Image, Text, Mobility Graph and Beyond

no code implementations6 May 2021 Tianyuan Huang, Zhecheng Wang, Hao Sheng, Andrew Y. Ng, Ram Rajagopal

Recent urbanization has coincided with the enrichment of geotagged data, such as street view and point-of-interest (POI).

Quick Line Outage Identification in Urban Distribution Grids via Smart Meters

no code implementations1 Apr 2021 Yizheng Liao, Yang Weng, Chin-Woo Tan, Ram Rajagopal

The growing integration of distributed energy resources (DERs) in distribution grids raises various reliability issues due to DER's uncertain and complex behaviors.

Change Point Detection Time Series +1

Generating private data with user customization

no code implementations2 Dec 2020 Xiao Chen, Thomas Navidi, Ram Rajagopal

Personal devices such as mobile phones can produce and store large amounts of data that can enhance machine learning models; however, this data may contain private information specific to the data owner that prevents the release of the data.

Activity Detection And Modeling Using Smart Meter Data: Concept And Case Studies

no code implementations26 Oct 2020 Hao Wang, Gonzague Henri, Chin-Woo Tan, Ram Rajagopal

Electricity consumed by residential consumers counts for a significant part of global electricity consumption and utility companies can collect high-resolution load data thanks to the widely deployed advanced metering infrastructure.

Action Detection Activity Detection

FedGAN: Federated Generative Adversarial Networks for Distributed Data

no code implementations12 Jun 2020 Mohammad Rasouli, Tao Sun, Ram Rajagopal

We propose Federated Generative Adversarial Network (FedGAN) for training a GAN across distributed sources of non-independent-and-identically-distributed data sources subject to communication and privacy constraints.

Generative Adversarial Network Time Series +1

Effective Data Fusion with Generalized Vegetation Index: Evidence from Land Cover Segmentation in Agriculture

no code implementations7 May 2020 Hao Sheng, Xiao Chen, Jingyi Su, Ram Rajagopal, Andrew Ng

How can we effectively leverage the domain knowledge from remote sensing to better segment agriculture land cover from satellite images?

Urban2Vec: Incorporating Street View Imagery and POIs for Multi-Modal Urban Neighborhood Embedding

no code implementations29 Jan 2020 Zhecheng Wang, Haoyuan Li, Ram Rajagopal

Understanding intrinsic patterns and predicting spatiotemporal characteristics of cities require a comprehensive representation of urban neighborhoods.

Document Embedding Semantic Similarity +1

AR-Net: A simple Auto-Regressive Neural Network for time-series

2 code implementations27 Nov 2019 Oskar Triebe, Nikolay Laptev, Ram Rajagopal

In this paper we present a new framework for time-series modeling that combines the best of traditional statistical models and neural networks.

Time Series Time Series Analysis

Energy Resource Control via Privacy Preserving Data

1 code implementation4 Oct 2019 Xiao Chen, Thomas Navidi, Ram Rajagopal

Although the frequent monitoring of smart meters enables granular control over energy resources, it also increases the risk of leakage of private information such as income, home occupancy, and power consumption behavior that can be inferred from the data by an adversary.

Systems and Control Computers and Society Systems and Control

Cloud Storage for Multi-Service Battery Operation (Extended Version)

no code implementations17 May 2019 Mohammad Rasouli, Tao Sun, Camille Pache, Patrick Panciatici, Jean Maeght, Ramesh Johari, Ram Rajagopal

The methodology consists in modelling the problem as a two-stage stochastic optimization between high priority stochastic grid services and low priority cloud storage for stochastic end users.

Blocking RTE +1

On the Interaction between Autonomous Mobility on Demand Systems and Power Distribution Networks -- An Optimal Power Flow Approach

1 code implementation1 May 2019 Alvaro Estandia, Maximilian Schiffer, Federico Rossi, Justin Luke, Emre Can Kara, Ram Rajagopal, Marco Pavone

Specifically, we extend previous results on an optimization-based modeling approach for electric AMoD systems to jointly control an electric AMoD fleet and a series of PDNs, and analyze the benefit of coordination under load balancing constraints.

Self-Driving Cars

Generative Adversarial Models for Learning Private and Fair Representations

no code implementations ICLR 2019 Chong Huang, Xiao Chen, Peter Kairouz, Lalitha Sankar, Ram Rajagopal

We present Generative Adversarial Privacy and Fairness (GAPF), a data-driven framework for learning private and fair representations of the data.

Fairness

Distributed generation of privacy preserving data with user customization

no code implementations20 Apr 2019 Xiao Chen, Thomas Navidi, Stefano Ermon, Ram Rajagopal

Distributed devices such as mobile phones can produce and store large amounts of data that can enhance machine learning models; however, this data may contain private information specific to the data owner that prevents the release of the data.

Privacy Preserving

Fast Distribution Grid Line Outage Identification with $μ$PMU

no code implementations14 Nov 2018 Yizheng Liao, Yang Weng, Chin-Woo Tan, Ram Rajagopal

This makes the theory on optimal change-point detection suitable to identify line outages via $\mu$PMUs with fast and accurate sampling.

Change Point Detection Time Series +1

Understanding Compressive Adversarial Privacy

no code implementations21 Sep 2018 Xiao Chen, Peter Kairouz, Ram Rajagopal

Designing a data sharing mechanism without sacrificing too much privacy can be considered as a game between data holders and malicious attackers.

Unbalanced Multi-Phase Distribution Grid Topology Estimation and Bus Phase Identification

no code implementations18 Sep 2018 Yizheng Liao, Yang Weng, Guangyi Liu, Zhongyang Zhao, Chin-Woo Tan, Ram Rajagopal

Then, this paper proves that the Chow-Liu algorithm finds the topology by utilizing power flow equations and the conditional independence relationships implied by the radial multi-phase structure of distribution grids with the presence of incorrect bus phase labels.

Generative Adversarial Privacy

no code implementations ICLR 2019 Chong Huang, Peter Kairouz, Xiao Chen, Lalitha Sankar, Ram Rajagopal

We present a data-driven framework called generative adversarial privacy (GAP).

Siamese Generative Adversarial Privatizer for Biometric Data

no code implementations23 Apr 2018 Witold Oleszkiewicz, Peter Kairouz, Karol Piczak, Ram Rajagopal, Tomasz Trzcinski

Extensive evaluation on a biometric dataset of fingerprints and cartoon faces confirms usefulness of our simple yet effective method.

Emotion Recognition

Context-Aware Generative Adversarial Privacy

no code implementations26 Oct 2017 Chong Huang, Peter Kairouz, Xiao Chen, Lalitha Sankar, Ram Rajagopal

On the one hand, context-free privacy solutions, such as differential privacy, provide strong privacy guarantees, but often lead to a significant reduction in utility.

Urban MV and LV Distribution Grid Topology Estimation via Group Lasso

no code implementations6 Nov 2016 Yizheng Liao, Yang Weng, Guangyi Liu, Ram Rajagopal

The increasing penetration of distributed energy resources poses numerous reliability issues to the urban distribution grid.

A Sparse Linear Model and Significance Test for Individual Consumption Prediction

no code implementations5 Nov 2015 Pan Li, Baosen Zhang, Yang Weng, Ram Rajagopal

Accurate prediction of user consumption is a key part not only in understanding consumer flexibility and behavior patterns, but in the design of robust and efficient energy saving programs as well.

Two-sample testing

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