SmartGrid

The Role of Demand & Storage in an Integrated Energy System [SmartGrid]

Topic: 
The Role of Demand & Storage in an Integrated Energy System
Abstract / Description: 

As energy systems have evolved from small isolated single energy vector systems into continental scale integrated energy systems the supply demand balance principle is a fundamental law underpinning and shaping their evolution. In an integrated energy system, supply demand balance, is across energy vectors (e.g. fuels, heat, and electricity), across scales/infrastructure (e.g. gas, heat, electricity networks) with and/or without storage capability and with all the consequential losses. In particular the demand side in an integrated energy system is no longer seen as a single energy vector consuming entity but rather as an entity that potentially can derive an energy service from a choice of energy vectors (e.g. hybrid cars), can self-supply (e.g. photovoltaic), can supply others and can store energy for later use. This trend is gaining traction but the direction of travel and the end result is very unclear. The component parts of this uncertainty are regulatory, economic, political and technological. Here the potential role in particular of demand and/or storage in a future integrated energy system is explored with some research results. The need for a more comprehensive, inter disciplinary, international and collaborative research and demonstration programme is highlighted and will be illustrated by reference to the Real Value project.


 

About the SmartGrid Seminar:

Our speakers will discuss exciting new ideas and technologies that are changing the electricity industry. The theme of the seminar series is on smart grids and energy systems, with speakers from academic institutions and industry. The hour-long seminars, including ample time for discussion, are held at 1:30 pm every Thursday. Open to all Stanford students, faculty and staff.

Date and Time: 
Thursday, January 19, 2017 - 1:30pm
Venue: 
Y2E2 300

High-Frequency Power Converters [Precourt Institute for Energy Seminar]

Topic: 
Energy Seminar: High-Frequency Power Converters
Abstract / Description: 

Juan's talk will cover how increases in switching frequency enable the miniaturization of power converters and new ways to fabricate and design power converters. It will address how these design techniques can be used in applications spanning biology, healthcare, space propulsion and automotive that use Wide Bandgap Power semiconductors at MHz frequencies. The talk will also discuss losses observed in GaN and SiC devices under high dv/dt conditions.

Date and Time: 
Monday, January 9, 2017 - 4:30pm to 5:30pm
Venue: 
NVIDIA Auditorium, Jen-Hsun Huang Engineering Center

SmartGrid Seminar: Greening a Top-20 Economy, Energy-Efficient Timely Transportation of Heavy-Duty Trucks

Topic: 
Greening a Top-20 Economy: Energy-Efficient Timely Transportation of Heavy-Duty Trucks
Abstract / Description: 

In 2015, the US trucking industry hauls 70.1% of all freight tonnage and collects $726.4 billion in gross freight revenues. This impressive number corresponds to 2.3x of Hong Kong GDP and would rank 19 worldwide if measured against countries. Meanwhile, only 4% of total vehicle population, heavy-duty trucks consume 17.6% of energy in transportation sector (including cars, trucks, airplanes, pipelines, and railways). This alerting observation, together with that fuel cost is the largest operating cost (34%) for truck operators, makes it critical to reduce fuel consumption for cost-effective and environment-friendly heavy-duty truck operation.

In this work, we consider a key yet under-explored problem in heavy-duty truck operation: timely transportation, where a heavy-duty truck travels between two locations across the national highway system subject to a hard deadline constraint. The objective is to minimize the total fuel consumption of the truck, by optimizing both route planning and speed planning. The problem is important for cost-effective and environment-friendly truck operation, and it is uniquely challenging due to its combinatorial nature as well as the need of considering hard deadline constraint. We first show that the problem is NP-Complete; thus exact solution is computational prohibited unless P=NP. We then design a fully polynomial time approximation scheme (FPTAS) that attains an approximation ratio of 1+ \epsilon with a network-size induced complexity of O(mn^2/\epsilon^2), where m and n are the numbers of nodes and edges, respectively. While achieving highly-preferred theoretical performance guarantee, the proposed FPTAS still suffers from long running time when applying to national-wide highway systems with tens of thousands of nodes and edges. Leveraging elegant insights from studying the dual of the original problem, we design a fast subgradient-like solution with O(m+ n log n) complexity. The proposed heuristic allows us to tackle the energy-efficient timely transportation problem on large-scale national highway systems. We further characterize a condition under which our heuristic generates an optimal solution; we also provide performance gap when the condition is not satisfied. We observe that the condition holds in most of the practical instances in numerical experiments, justifying the superior empirical performance of our heuristic. We carry out extensive numerical experiments using real-world truck data over the actual U.S. highway network. The results show that our proposed solutions achieve 17% (resp. 14%) fuel consumption reduction, as compared to a fastest path (resp. shortest path) algorithm adapted from common practice.
Overall, we believe that de-carbonizing heavy-duty truck operation is important for the sustainable development of the trucking industry. Our work serves as a call for participation.
This is a joint work with Lei Deng and Mohammad Hajiesmaili in CUHK and Haibo Zeng in Virginia Tech.

Date and Time: 
Wednesday, December 14, 2016 - 1:00pm to 2:00pm
Venue: 
Y2E2 270

SmartGrid Seminar: Efficiency of Connection Charges for Distribution Systems with Distributed Energy Resources

Topic: 
On the Efficiency of Connection Charges for Distribution Systems with Distributed Energy Resources
Abstract / Description: 

The advent of several disruptive innovations in distributed renewable generation, battery storage, and smart meter technology is transforming the electric power industry. A rising concern of this transformation is the impact of distributed energy resources (DERs) on the financial viability of traditional regulated distribution utilities. In particular, under volumetric and net-metering tariffs, the integration of behind-the-meter DERs, including storage systems, could compromise the ability of grid operators to recover their fixed operational and capital expenditures, which leads to the so-called "death spiral" hypothesis. In this talk, we examine the role of connection charges for a regulated monopolistic retailer who serves heterogeneous consumers. We examine two DER integration models: (i) the behind-the-meter integration by consumers under a net metering tariff, and (ii) a centralized integration by the retailer. For both cases, we obtain the optimal ex-ante two-part tariff consisting of connection and volumetric charges. The structure of the optimal two-part tariff reveals how the benefits and costs of DERs are allocated optimally across consumers. While the optimal two-part tariff yields the same social welfare under the two integration models, the benefits of DER integration are distributed very differently among consumers who have different integration capabilities. Our results also show that the absence of the connection charge, rather than net-metering, is the main cause of economic inefficiency. Results from empirical studies also illustrate the potential gain for consumers when the optimal two-part tariff is adopted.


 

About the SmartGrid Seminar: 

Our speakers will discuss exciting new ideas and technologies that are changing the electricity industry. The theme of the seminar series is on smart grids and energy systems, with speakers from academic institutions and industry. The hour-long seminars, including ample time for discussion, are held at 1:30 pm every Thursday. Open to all Stanford students, faculty and staff.

Date and Time: 
Thursday, December 1, 2016 - 1:30pm to 2:30pm
Venue: 
Y2E2 111

SmartGrid Seminar

Topic: 
Optimal Sizing of Distributed Energy Storage and Power Flow Solutions
Abstract / Description: 

We present two recent results. In the first result, we use a continuous linearized power flow model for distribution networks and derive the optimal sizing of distributed energy storage devices to minimize power loss and prove several monotonicity properties of the optimal solution when all loads have the same shape. We show through simulations that these structural properties hold approximately in standard discrete nonlinear power flow models, even when loads have different shapes. In the second result, we describe a recent method for computing power flow solutions using monotone operators. The basic idea is to embed an operationally relevant space in a domain of voltages over which the power flow operator is monotone. Such domains are non unique and we show that at most one power flow solution exists in each of these domains. Efficient algorithms, based on solving an associated monotone variational inequality, can compute power flow solutions in the monotonicity domain or certify that none exists in the monotonicity domain. (Joint work with Yujie Tang (Caltech), Krishnamurthy Dvijotham (PNNL), Michael Chertkov (ANL))


About the SmartGrid Seminar: 

Our speakers will discuss exciting new ideas and technologies that are changing the electricity industry. The theme of the seminar series is on smart grids and energy systems, with speakers from academic institutions and industry. The hour-long seminars, including ample time for discussion, are held at 1:30 pm every Thursday. Open to all Stanford students, faculty and staff.

Date and Time: 
Thursday, November 3, 2016 - 1:30pm to 2:30pm
Venue: 
Y2E2 111

SmartGrid Seminar

Topic: 
Computing for Electric Grid Planning and Design
Abstract / Description: 

The electric grid is seeing unprecedented change. New mandates for higher levels of renewable generation, distributed energy resources, cyber security, etc. are introducing increasing levels of complexity for grid planning and engineering. These changes are exceeding capabilities of today's modeling and analysis tools by utilities, ISOs, regulators, and vendors to support critical decisions for investment, engineering, and policy development. This 'technology gap' in tools represents an exciting opportunity for research in advanced computing and modeling methods. New approaches in high performance computing, numerical methods, computer science, and data analytics will greatly enhance grid stakeholders ability to predict and optimize evolutions of the electric grid. In this talk, the speaker will discuss new research in planning and design tools in DOE, gaps in tools technologies, and the role of advanced computing in developing next generation planning and design tools.


 

About the SmartGrid Seminar: 
Our speakers will discuss exciting new ideas and technologies that are changing the electricity industry. The theme of the seminar series is on smart grids and energy systems, with speakers from academic institutions and industry. The hour-long seminars, including ample time for discussion, are held at 1:30 pm every Thursday. Open to all Stanford students, faculty and staff.

Date and Time: 
Thursday, October 27, 2016 - 1:30pm to 2:30pm
Venue: 
Y2E2 111

SmartGrid Seminar

Topic: 
Smart EV Charging, VGI, V2G, and MicroGrid Controllers
Abstract / Description: 

Kisensum is a software company that is dedicated to developing solutions for electric vehicle charging, stationary energy storage systems, and microgrids. Kisensum's microgrid controller software is flexible and adaptable to the needs of grid tied or islanded systems. It controls energy storage, EVs, PV, and inverters for demand charge management, resiliency, and PV over generation capture. The architecture is reliable and resilient, using open protocols and standards to easily incorporate all of the components of a microgrid. Build upon DOD cyber security standards, all applications integrate new batteries, 2nd life batteries, electric vehicles, PV, and building data into common processing model. The experience of developing and rolling out OpenADR internationally and developing the software for the first V2G fleet participating in the CAISO F/R market gives Kisensum a unique understanding of wholesale and utility energy markets.

Date and Time: 
Thursday, October 13, 2016 - 1:30pm to 2:30pm
Venue: 
Y2E2 111

SmartGrid Seminar

Topic: 
Data Management Research with Emphasis on Buildings and Advanced Infrastructure Systems
Abstract / Description: 

Infrastructure systems, broadly defined to include buildings and other facilities, transportation infrastructure, telecommunication networks, the power grid and environmental systems will require more and more that engineers provide a continuous state awareness, assessment and proactive decision making for the complete life-cycle of the systems and processes they create. Such continuous state awareness and proactive decision making will allow these systems to be more efficiently and effectively managed in both normal and abnormal conditions. Advanced Infrastructure Systems is defined here to refer to innovative systems, components, devices and processes that improve the performance and/or reduce the life-cycle cost of a broad range of physical infrastructure systems. There are many technological developments and research projects that already support, or begin to support this vision. Civil Engineers, not just electrical and computer engineers and computer scientists, can and should be involved in delivering this overall vision. At this talk professor Soibelman will introduce his vision and work developed within his research group that focus on the application and exploration of emerging Information and Communication Technologies (ICT), to a broadly defined set of infrastructure systems and associated processes, such as planning, design, construction, facility/infrastructure management, and environmental monitoring, so as to improve their sustainability, efficiency, maintainability, durability, and the overall performance of these systems.

Date and Time: 
Thursday, October 6, 2016 - 1:30pm to 2:30pm
Venue: 
Y2E2 – 111 (JERRY YANG AND AKIKO YAMAZAKI ENVIRONMENT AND ENERGY)

SmartGrid Seminar

Topic: 
Distributed Intelligence for Smart Grid Operation and Control
Abstract / Description: 

The electric power grid is a spatially and temporally complex, non-convex, non-linear, and non-stationary system with uncertainties at many levels. The integration of renewable sources of energy such as wind and solar farms, energy storage, and plug-in hybrid electric vehicles will add further complexity and challenges to efficient operation of future grids. Multi-agent systems based on distributed intelligence offer a particularly attractive approach for operation and energy management in a smart grid. In this seminar, I will discuss some of our projects where multi-agent systems have been employed for operation optimization, decision making and control of a smart grid.

Date and Time: 
Monday, August 1, 2016 - 10:00am to 11:00am
Venue: 
Y2E2 270

Claude E. Shannon's 100th Birthday

Topic: 
Centennial year of the 'Father of the Information Age'
Abstract / Description: 

From UCLA Shannon Centennial Celebration website:

Claude Shannon was an American mathematician, electrical engineer, and cryptographer known as "the father of information theory". Shannon founded information theory and is perhaps equally well known for founding both digital computer and digital circuit design theory. Shannon also laid the foundations of cryptography and did basic work on code breaking and secure telecommunications.

 

Events taking place around the world are listed at IEEE Information Theory Society.

Date and Time: 
Saturday, April 30, 2016 - 12:00pm
Venue: 
N/A

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