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Identification of temporal and topology related challenges to the operation of modern distribution systems (MDS) with high penetration of distributed energy resources is critical to developing and assessing control strategies. This paper proposes analysis of typical and historical load and generation patterns to identify and anticipate critical intersections in generation and load that stress distribution...
Evaluation of relay misoperations provides an opportunity to improve the design of backup protection schemes. Existing generator station backup protection schemes use distance protection (21) or voltage controlled/restrained overcurrent protection (51V) elements for clearing phase faults that are not cleared by either line protection or generator protection. Many schemes also use transformer ground...
This paper is based on an ongoing project that is evaluating the potential for a microgrid in a city in northwest region of the US. Power for the microgrid will be supplied largely from existing hydroelectric generators and proposed photovoltaic installations. This study focuses on the voltage profiles of all of the buses in the microgrid during different seasons of the year and identifies the ways...
This paper studies a practical implementation of a renewable microgrid in a city in the Northwest region of the U.S.A. The microgrid is sourced mainly by the hydro-generation location in midst of the city and future solar installations, which combined could be adequate to run some of the critical loads in the city. This paper will shed light on the possible independent operation of microgrid with...
There are increasing costs associated with utility electricity generation and increasing requirements to meet more stringent environmental regulations. These influences have contributed to a recent increasing trend of generating power locally at distribution voltage level using non-conventional resources. The impact of this technology on existing high voltage electrical transmission networks needs...
Microgrids are proving themselves viable to address the need for more reliable renewable power systems. They can improve the resilience of the overall system in case of abnormal conditions. The city of Spokane in Washington, is considering establishing a microgrid using existing transmission and distribution infrastructure. This microgrid will be supplied solely from the existing hydroelectric generators...
Generation connected to the transmission system via inverters (electronically coupled generation) is a growing. Utility protection engineers conventionally use impedance matrix algorithms to determine fault current magnitudes and angles, perform coordination studies, and guide relay settings. In transmission protection studies, it has thus far been common practice to exclude the fault current contributions...
Three harmonic mitigation techniques are presented to reduce the harmonic emission of a diode bridge rectifier based battery charger used to recharge the main propulsion batteries of a large scale electric vehicle. The hybrid electrical vehicle (HEV) studied here, uses a battery charger that produces current harmonics in excess to cause the control circuitry of the battery chargers to malfunction...
We propose an optimization approach to design cost-effective electrical power transmission networks. That is, we aim to select both the network structure and the line conductances (line sizes) so as to optimize the trade-off between network efficiency (low power dissipation within the transmission network) and the cost to build the network. We begin with a convex optimization method based on the paper...
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