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Raja Ayyanar
Arizona State University
131Publications
18H-index
1,501Citations
Publications 131
Newest
#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: 18
view all 3 authors...
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 ...
#1Nikhil Korada (ASU: Arizona State University)
#2Ziwei Yu (ASU: Arizona State University)H-Index: 1
Last.Raja Ayyanar (ASU: Arizona State University)H-Index: 18
view all 3 authors...
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 ...
Mar 1, 2018 in APEC (Applied Power Electronics Conference)
#1Ziwei Yu (ASU: Arizona State University)H-Index: 1
#2Yinglai Xia (TI: Texas Instruments)
Last.Raja Ayyanar (ASU: Arizona State University)H-Index: 18
view all 3 authors...
This paper proposes a zero-voltage-transition (ZVT) technique for the full-bridge based bridgeless single-phase PFC. An auxiliary circuit consists of a small auxiliary inductor and two active switches is placed in parallel with the main filter inductor. The proposed ZVT technique has several advantages over the existing ZVT schemes including low ripple of the filter inductor current, natural zero-current-switching (ZCS) for the auxiliary switches, relatively less additional components and allowi...
Mar 1, 2018 in APEC (Applied Power Electronics Conference)
#1Jinia Roy (ASU: Arizona State University)H-Index: 4
#2Yinglai Xia (TI: Texas Instruments)
Last.Raja Ayyanar (ASU: Arizona State University)H-Index: 18
view all 3 authors...
Double line frequency power decoupling with reduced capacitance and mitigation of leakage current are two of the major challenges of any grid-connected single phase photovoltaic (PV) inverter. This paper compares the performances of different topologies for single phase transformerless PV application in terms of the power decoupling capacitor requirement, the current ripple and total harmonic distortion (THD), efficiency performance, and leakage current. The topologies considered include a doubl...
Mar 1, 2018 in APEC (Applied Power Electronics Conference)
#1Jinia Roy (ASU: Arizona State University)H-Index: 4
#2Raja Ayyanar (ASU: Arizona State University)H-Index: 18
This paper proposes a modified duty phase shift technique for an M-phase extended-duty-ratio (EDR) boost converter to facilitate the inherent current sharing property and reduced voltage stress on the switching devices of the EDR converter over wider operating region. With conventional phase shift of (360/M)° among the operating phases, a reduced voltage stress and inherent current share between the interleaved boost phases is only possible for the operating region of duty ratio given by (M − 1)...
Mar 1, 2018 in APEC (Applied Power Electronics Conference)
#1Ziwei Yu (ASU: Arizona State University)H-Index: 1
#2Chenhao Nan (Google)H-Index: 4
Last.Raja Ayyanar (ASU: Arizona State University)H-Index: 18
view all 3 authors...
In this paper, an accurate averaged model of an active-clamp buck converter is presented. An insightful and straightforward derivation method is developed for dealing with signals with large ripple. The large and small signal models are derived and verified through detailed simulations. For the control-to-output bode diagrams, the Simplis simulation result shows a good match with the derived model. Then, an investigation of the active-clamp buck dynamics and the guideline for choosing the clamp ...
Mar 1, 2018 in APEC (Applied Power Electronics Conference)
#1Jinia Roy (ASU: Arizona State University)H-Index: 4
#2Raja Ayyanar (ASU: Arizona State University)H-Index: 18
Due to their plug and play feature, easy installation, and higher power yield under partial shading conditions, microinverters have gained popularity in the roof-top-PV market. This paper explores a converter system for the transfomer-less microinverter with coupled inductor based interleaved boost as the dc-dc stage and half bridge voltage swing (HBVS) inverter as the dc-ac stage. The dc-dc stage is capable of offering high gain with a flexible choice of turns ratio of the coupled inductor but ...
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