A Generic Microgrid Controller

Samuelsen, Scott; EdisonMelRokETAP, Southern California

doi:10.2172/1501818

Cited by 4 publications

(6 citation statements)

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“…It also encompasses ten 12.4 kV circuits, includes 3.7 MW of solar power, and is served by a 13.5 MW gas and a 5.6 MW steam turbine. The test bed incorporates a centralized chilling plant, including a large thermal energy storage tank (4.5 million gallons/60000 ton‐hours), and serves all major buildings with district heating and cooling 33,34 . The UCI microgrid also contains a set of DERs that includes two‐axis tracking concentrated solar photovoltaic systems, and a 2 MW/500 kW‐hr Li‐Ion battery deployed at the UCI substation.…”

Section: Operation and Protection Schemes In North American Microgridsmentioning

confidence: 99%

“…Under the Zero Emission Vehicle‐Network Enabled Transport program, a fleet of 77 advanced vehicles are installed 35 . The UCI microgrid one‐line diagram is shown in Figure 12 33 …”

Section: Operation and Protection Schemes In North American Microgridsmentioning

confidence: 99%

“…The UCI microgrid protection system was based on the islanding field demonstration using four SEL devices 33 . A SEL 451 protection, automation, and bay control system relay detect the loss of utility power and generate a direct transfer trip signal to a SEL 700G Generator Protection Relay.…”

Section: Operation and Protection Schemes In North American Microgridsmentioning

confidence: 99%

“…Upon receipt of a transfer trip from the SEL 451, the 700G Generator Protection Relay interfaces to the control inputs of the gas turbine, and adjusts the turbine frequency and voltage reference set points and operation mode control. It also implements resynchronization of the gas turbine to the grid 33 . In addition, a SEL 3530 real‐time automation controller serves as a data acquisition and interface system, and a SEL 751 feeder protection relay trips and closes the point of common coupling breaker 33 .…”

Section: Operation and Protection Schemes In North American Microgridsmentioning

confidence: 99%

“…It also implements resynchronization of the gas turbine to the grid 33 . In addition, a SEL 3530 real‐time automation controller serves as a data acquisition and interface system, and a SEL 751 feeder protection relay trips and closes the point of common coupling breaker 33 . In the UCI microgrid protection, the standard generator protection curves for phase and ground current differential, phase instantaneous overcurrent, time delay overcurrent, phase unbalance, under/overvoltage, over/under frequency, and rate of change frequency identified the operation scenarios that cannot achieve seamless islanding 33 .…”

Section: Operation and Protection Schemes In North American Microgridsmentioning

confidence: 99%

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Protection schemes used in North American microgrids

Piesciorovsky

Smith

Ollis

2020

Int Trans Electr Energ Syst

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Summary This study reviewed existing conventional and nonconventional protection schemes for grid‐connected and islanded mode operations in North American microgrid projects. The microgrid projects investigated in this study used different types of distributed energy resources (DERs) and integrated hydropower/diesel generators, gas/steam/wind turbines, and photovoltaic systems with energy storage. In this work, conventional protection schemes were defined as those within the IEEE Standard C37.2‐2008, whereas nonconventional schemes were those not defined within this standard. The pros and cons of conventional and nonconventional protection schemes were discussed in detail. The overvoltage, undervoltage, and frequency elements were the most common conventional protection schemes applied in microgrid projects in North America. These protection elements were used to detect the islanded conditions and faults that could not be sensed by overcurrent relays because of small fault currents contributed by low‐inertia DERs and power‐electronic sources. Directional overcurrent elements were used to distinguish between external (grid) and internal (microgrid) faults. Adaptive protection was the most popular nonconventional protection scheme applied to the microgrid projects. In conclusion, different types of DERs and operational modes must be considered in order to address the protection and control challenges of each microgrid and to obtain the best technical and economical solution.

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Section: Operation and Protection Schemes In North American Microgridsmentioning

confidence: 99%

“…Under the Zero Emission Vehicle‐Network Enabled Transport program, a fleet of 77 advanced vehicles are installed 35 . The UCI microgrid one‐line diagram is shown in Figure 12 33 …”

Section: Operation and Protection Schemes In North American Microgridsmentioning

confidence: 99%

Section: Operation and Protection Schemes In North American Microgridsmentioning

confidence: 99%

Section: Operation and Protection Schemes In North American Microgridsmentioning

confidence: 99%