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Proliferation of distributed energy resources (DERs) on the low voltage network comes with a myriad of power quality problems such as voltage fluctuations and poor harmonic performance. Distributed mitigation solutions are being proposed for the low voltage network which are similar to state-of-the-art solutions in medium voltage networks. This paper presents a μ-STATCOM device as a distributed solution...
Traditionally, electric utilities have been maintaining their customer voltages within the desired limits by operating the primary devices, such as transformers with load tap changer (LTC), voltage regulators, and capacitor banks. In recent years, new advanced systems, such as conservation voltage reduction (CVR) have been implemented on the distribution systems with the main goal of reducing the...
Microgrid is any subset of a distribution grid that can be islanded from the grid and continue to operate as a distributed energy resource (DER). Recent advances in technology have enabled the creation of microgrid test beds, with distributed generation (DG) and energy storage providing sufficient energy to power the loads within the Microgrids. Duke Energy is developing a new Microgrid test bed at...
Electric utility distribution power systems as operated today are rarely perfectly balanced. While feeders with single-phase voltage regulators (VR) tend to be more balanced, feeders with substation transformers that have load tap changer (LTC) or line capacitors only for voltage control are more challenging to balance. BGE distribution system has very few LTCs and VRs. Both voltage and VAr control...
Baltimore Gas and Electric (BGE) started implementing distribution automation (DA) into its distribution system operations since early 2000. With the advances in communications and technology, the number of available DA applications has significantly increased. In order to improve the system reliability, BGE decided to utilize fault circuit indicators (FCIs) as part of its Smart Grid Pilot Program...
Introduction of deferrable loads such as electric vehicles, on the distribution system will have major impact on the electric utility system operations and especially the loading of the distribution transformers. This paper addresses challenges associated with overloading on the distribution transformer and offers new approach to reducing its loading and extending its lifetime based on the pricing...
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