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2013 Publications


Power Grid Sensitivity Analysis of Geomagnetically Induced Currents
Geomagnetically induced currents (GICs) have the potential to severely disrupt power grid operations, and hence their impact needs to be assessed through planning studies. This paper presents a methodology for determining the sensitivity of the GICs calculated for individual and/or groups of transformers to the assumed quasi—dc electric fields on the transmission lines that induce the GICs. Example calculations are provided for two small systems and for the North American Eastern Interconnect model. Results indicate that transformer GICs are mostly due to the electric fields on nearby transmission lines, implying localized electric field models may be appropriate for such studies.

Submitted to Transaction on Power Systems, March 2013. Uploaded: March 25, 2013.  
07/06/16 1.05 MB PDF 13-33
PSERC Future Grid Initiative Proceedings
The work described in this proceedings was made possible by funding provided by the U.S. Department of Energy for “The Future Grid to Enable Sustainable Energy Systems,” an initiative of the Power Systems Engineering Research Center.

Papers Authored by Researchers in the DOE Funded Project “The Future Grid to Enable Sustainable Energy Systems”. Prepared for the PSERC Industry-University Meeting on Preparing for the Future Grid, May 29-31, 2013, Madison, Wisconsin.

Uploaded: May 29, 2013.  
Project Leader: Vijay Vittal, Arizona State 06/28/16 10.60 MB PDF 13-34
Robust Corrective Topology Control for System Reliability
Abstract—Corrective transmission switching schemes are an essential part of grid operations and are used to improve the reliability of the grid as well as the operational efficiency. Today, the transmission switching schemes are established based on the operator’s past knowledge of the system as well as other ad hoc methods. In this paper, three topology control (corrective transmission switching) methodologies are presented along with the detailed formulation of robust corrective switching. By incorporating robust optimization into the corrective switching framework, the switching solution is guaranteed to be feasible for a range of system operating states. The robust model can be solved offline to suggest switching actions that can be used in a dynamic security assessment tool in real-time. The proposed robust topology control algorithm can also generate multiple corrective switching actions for a particular contingency. The robust topology control formulation is tested on an IEEE 118-bus test case with different uncertainty sets.

To be published in Transactions on Power Systems. Uploaded: July 2, 2013.  
Akshay S. Korad, Student, and Kory W. Hedman, Arizona State Univ. 07/06/16 1010.61 KB PDF 13-35
Systems Real-world Performance of a CERTS Microgrid in Manhattan
Abstract - CERTS microgrid technology enabled the Brevoort, a 1950’s era luxury co-op tower in Greenwich Village, NY, to maintain power, water and heat during the week of wide spread utility outages left in the wake of Hurricane Sandy in late 2012. The microgrid system, anchored by four 100kW hybrid CHP units, powered the entire building including the central boilers, domestic water pumps, elevators and all apartments while most buildings in the lower third of Manhattan were without power, heat, and, in many cases, water. The Brevoort co-op board elected to convert the 20–story building from oil heat to the natural gas CHP system as part of an energy-efficiency green initiative that was fully implemented in 2010. In New York City, these hybrid cogeneration systems can operate in parallel with Con Edison utilities during periods of regularly available power. During a power grid failure, the units, with its permanent magnet generator and inverter with built in CERTS microgrid technology, will continue to power the residences.

Submitted to Special Section on Microgrids for Sustainable Energy: IEEE Transactions on Sustainable Energy. Uploaded: July 2, 2013.  
Robert H. Lasseter, et al., Univ of Wisconsin-Madison 07/06/16 704.88 KB PDF 13-36
CERTS Microgrid Demonstration with Large-Scale Energy Storage and Renewable Generation
Abstract - The Consortium for Electric Reliability Technology Solutions (CERTS) Microgrid concept captures the emerging potential of using a system approach to distributed generation. CERTS views generation and associated loads as a subsystem or a “Microgrid.” The sources can operate in parallel to the grid or can operate in island, providing high levels of electrical reliability. The system can disconnect from the utility during large events (i.e., faults, voltage collapses), but also may disconnect intentionally when the quality of power from the grid falls below certain standards. CERTS Microgrid concepts have been demonstrated at the Alameda County Santa Rita Jail in California. The existing system included a 1-MW fuel cell, 1.2 MW of solar photovoltaic, and two 1.2-MW diesel generators. Adding a 2-MW, 4-MWh storage system, a fast static switch, and a power factor correcting capacitor bank enabled microgrid operation. The islanding and resynchronization methods met all Institute of Electrical and Electronics Engineers Standard 1547 and the reliability requirements of the jail.

Submitted to "Energy Storage Applications for Smart Grid". Special Section of IEEE Transactions on Smart Grid. Uploaded: July 2, 2013.  
Robert H. Lasseter, et al., Univ. of Wisconsin - Madison 07/06/16 495.09 KB PDF 13-37
Line Limit Preserving Power System Equivalent
Abstract—A reduced order equivalent of a power system is a simplified model of the original system with the ability to preserve some key characteristics and to provide adequate fidelity in simulation studies with considerably reduced computational requirements. In this paper, an algorithm to construct an equivalent system with the ability to retain thermal line limits is presented. The application of Kron’s reduction and power transfer distribution factor is used in the creation of the reduced system. The criteria for this method and its step-by-step procedure with the implementation to a small power system are described. Also, the result of its application to the IEEE 118 bus system is provided.

2013 IEEE Power & Energy Conference (2013 PECI), pp. 206-212, Champaign, Illinois, February 22-23, 2013.  
Wonhyeok Jang, et. al, Univ. of Illinois at Urbana-Champaign 07/06/16 679.80 KB PDF 13-39