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Raja Ayyanar
Arizona State University
153Publications
25H-index
2,921Citations
Publications 158
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#1Pedro Ponce-Cruz (Tec: Monterrey Institute of Technology and Higher Education)H-Index: 11
#2Antonio Rosales (UAH: University of Alabama in Huntsville)H-Index: 7
Last.Raja AyyanarH-Index: 1
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Since direct-current (DC) drives are commonly used electric drives, it is imperative to improve their operation under sudden torque-load disturbances. Several industrial applications work under torque-load changes that strongly affect the speed response of the motor, thus deteriorating the performance of the DC drive. On the other hand, discontinuous sliding-mode control (SMC) ensures robustness against disturbances and changes in parameters but has certain drawbacks, such as chattering. In this...
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This paper analyzes the operation of a high gain non-isolated boost converter that is a combination of interleaved boost and switched capacitor configuration in critical conduction mode. The converter is able to provide high gain while reducing the current and voltage stresses on semiconductor devices. The converter operation can be divided into different zones based on the duty ratio of operation. In Zone I, which corresponds to the highest gain, the converter possesses inherent current sharing...
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This paper analyzes the fault tolerance of non-isolated, modular, high gain dc-dc boost converter under different fault conditions. In the absence of transformer isolation, there are safety concerns in high gain converters in ensuring that high voltage stress is not applied to low voltage ports under any component failure conditions. The main idea is to increase the reliability of converter operation by making minimal modifications to the actual converter and control scheme as well as minimal co...
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Last.Farib KhondokerH-Index: 1
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#1Ziwei Yu (ASU: Arizona State University)H-Index: 1
#2Yingying Tang (PNNL: Pacific Northwest National Laboratory)
Last.Raja Ayyanar (ASU: Arizona State University)H-Index: 25
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This study explains the underlying concepts and implementation details of using an open source distribution analysis tool – OpenDSS to conduct dynamic simulations of converter interfaced generation (CIG) in large, realistic power distribution systems. The dynamic models of different types of CIGs are derived and written into the dynamic-link library (DLL) to be called by OpenDSS during simulation. The DLL development is illustrated in detail with the programme structure and the model derivation ...
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#1Vivek Sivaraman Narayanaswamy (ASU: Arizona State University)H-Index: 1
#2Raja Ayyanar (ASU: Arizona State University)H-Index: 25
Last.Devarajan SrinivasanH-Index: 5
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A cyber-physical system (CPS) approach for optimizing the output power of photovoltaic (PV) energy systems is proposed. In particular, a novel connection topology reconfiguration strategy for PV arrays to maximize power output under partial shading conditions using neural networks is put forth. Depending upon an irradiance/shading profile of the panels, topologies, namely series parallel (SP), total cross tied (TCT) or bridge link (BL) produce different maximum power points (MPP). The connection...
1 CitationsSource
#1R. Scott Mongrain (ASU: Arizona State University)
#2Ziwei Yu (ASU: Arizona State University)H-Index: 1
Last.Raja Ayyanar (ASU: Arizona State University)H-Index: 25
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The continued rise of renewable energy sources (RES) and distributed generation (DG) necessitate and support the invention of smart grid technologies, among which communication and remote control are keystone features. Multilevel control strategies improve grid stability and provide the necessary flexibility to address changing demand, contingency, and DG variability. To test these strategies while avoiding damage to existing infrastructure or lab equipment, simulation is employed to facilitate ...
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#1Nikhil Korada (ASU: Arizona State University)H-Index: 1
#2Ziwei Yu (ASU: Arizona State University)H-Index: 1
Last.Raja Ayyanar (ASU: Arizona State University)H-Index: 25
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Application of wide band gap (WBG) devices are getting a sharp rise in the recent power electronics sector, due to their superior performance when compared to silicon. Even though GaN devices provide a promising efficiency and power density numbers, but high frequency operation limits these benefits. This leaves behind a space for the realization of high frequency based soft switching topologies, which in combination with the GaN makes the converter size smaller and simultaneously efficient. In ...
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