Vijay Bhavaraju

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Microgrids are receiving attention due to the increasing need to integrate distributed generations and to insure power quality and to provide energy surety to critical loads. Since renewables need to be in the mix for energy surety, a high renewable-energy penetrated microgrid is analyzed in this paper. The standard IEEE 34 bus distribution feeder is(More)
Microgrids are receiving attention due to the increasing need to integrate distributed generations and to ensure power quality and to provide energy surety to critical loads. Some of the main topics concerning microgrids are transients and stability concerns during transitions including intentional and unintentional islanding and reconnection. In this(More)
Renewable energy sources connected to the utility grid can achieve enough penetration to affect the distribution system since they are intermittent. An aging electric distribution system infrastructure, with an increasing demand for power quality, reliability, energy surety, and security, needs solutions for managing increasing penetration of renewables. By(More)
Microgrids are receiving a lot of attention to utilize distributed generations in a sub-system and provide higher efficiency and reliability and support local loads. A high renewable-energy penetrated microgrid is studied in this paper. The distribution system and the loads in the microgrid are represented by a properly scaled 12kV IEEE 34 bus system. The(More)
Microgrids can provide the most promising means of integrating large amounts of distributed sources into the power grid and can supply reliable power to critical loads. A generalized control framework is required to regulate microgrid voltage and frequency, maintain system stability, maintain power quality, and manage distributed generations. A microgrid(More)
A Microgrid is a cluster of distributed generation (DG), renewable sources, and local loads connected to the utility grid. A microgrid provides a solution to manage local generations and loads as a single grid-level entity. It has the potential to maximize overall system efficiency, power quality, and energy surety for critical loads. The Microgrid Exchange(More)
As the transformerless solar inverters have been pushed to an impressive 99% efficiency in residential and small commercial applications (less than 20 kW), high efficiency medium and large commercial scale (50-250 kW) transformerless solar inverters are gaining more and more attentions. However, due to the differences of inverter power ratings, grid(More)
Microgrids are receiving tremendous attention due to increasing need to integrate Distributed Generations (DG) and to provide reliable power to critical loads. Proper power management in microgrid is required to regulate the system voltage and frequency, maintain power quality, and manage DGs. A microgrid system has been studied in this paper, which(More)
Photovoltaic (PV) systems have the intrinsic nature of distributed DC power generation that requires additional protection to reduce the fire and shock risks from various PV faults. Due to the current limited nature of PV generation, the short circuit current of a PV panel is typically 1.2 times of its rated current. This poses a unique overcurrent(More)
The concept of microgrid can integrate large amounts of Distributed Generations (DG) into power system and provide higher reliability, energy security and surety to critical loads. A Virtual Droop Control (VDC) method is proposed for the power management and voltage and frequency regulation and has been applied to the Fort Sill microgrid. The state space(More)