Sanjay K Chaudhary

Sanjay K Chaudhary

Aalborg Universitet

H-index: 27

Europe-Denmark

About Sanjay K Chaudhary

Sanjay K Chaudhary, With an exceptional h-index of 27 and a recent h-index of 21 (since 2020), a distinguished researcher at Aalborg Universitet, specializes in the field of HVDC, FACTS, Offshore Wind, Renewable Energy.

His recent articles reflect a diverse array of research interests and contributions to the field:

Advancing minigrid clusters in Ethiopia: A Multi-Tier Framework for optimal planning and sizing

Calculating the Power of Toric Intraocular Lens using Total Corneal Astigmatism Measured by a Swept-Source Optical Coherence Tomography-Based Device: An Observation which …

A Hierarchical Harmonic Control Method for Wind Power Plants in Microgrids

Early pigment dispersion and raised intraocular pressure after uneventful central-hole implantable collamer lens surgery

Active damping for dynamic improvement of multiple grid-tied virtual synchronous generators

Fractional order virtual synchronous generator

Minigrids for Rural Electrification in Ethiopia

The opportunity cost of managing toric intraocular lens rotation cases for a private cataract surgery center in India: A decision-analytic model comparing three toric …

Sanjay K Chaudhary Information

University

Aalborg Universitet

Position

Department of Energy Technology

Citations(all)

2628

Citations(since 2020)

1703

Cited By

1547

hIndex(all)

27

hIndex(since 2020)

21

i10Index(all)

48

i10Index(since 2020)

35

Email

University Profile Page

Aalborg Universitet

Sanjay K Chaudhary Skills & Research Interests

HVDC

FACTS

Offshore Wind

Renewable Energy

Top articles of Sanjay K Chaudhary

Advancing minigrid clusters in Ethiopia: A Multi-Tier Framework for optimal planning and sizing

Authors

Ying Wu,Sanjay Chaudhary,Gibran David Agundis Tinajero,Yanpeng Wu,Baseem Khan,Yiheyis Eshetu,Kinfe Negash,Juan C Vasquez,Josep M Guerrero

Journal

Energy Reports

Published Date

2024/6/1

This paper introduces an innovative approach to promote sustainable electrification in Ethiopia through the strategic development of minigrid clusters. In collaboration with Ethiopian authorities, technical and economic barriers obstructing the large-scale deployment of minigrid clusters are systematically identified. A novel Multi-Tier Framework (MTF)-based energy access matrix is presented, facilitating the creation of hybrid load profiles prioritizing affordability and reliability. The most suitable multi-criteria optimization strategy tailored to the Ethiopian context is explored, emphasizing the need for scalable and adaptable solutions. The proposed approach is rigorously validated through case studies in three villages within the Southern Nations, Nationalities, and Peoples' Region (SNNP). The research findings reveal the remarkable techno-economic advantages of minigrid clusters when compared to single minigrids …

Calculating the Power of Toric Intraocular Lens using Total Corneal Astigmatism Measured by a Swept-Source Optical Coherence Tomography-Based Device: An Observation which …

Authors

Sanjay Chaudhary,Alka Pandey,Anju Sharma,Rahil Chaudhary,Hema Mehra,Nishtha Khurana,Divya Vermani,Ritu Nagpal

Journal

Delhi Journal of Ophthalmology

Published Date

2023/1/1

Toric intraocular lenses (IOLs) have been a game-changer for addressing patients with cataract and significant preexisting corneal astigmatism. With increasing demands and expectations of the patients, there is now a greater responsibility on part of anterior segment surgeons to offer a postoperative uncorrected visual acuity of 6/6. At present, majority of surgeons rely on the “measured” values of anterior corneal astigmatism and “predicted” values of posterior corneal astigmatism to calculate the final IOL power and the axis of the toric IOL. Such a practice, at times, has been shown to result in unexpected postoperative refractive outcomes. We have had situations where the anterior corneal curvature values suggested using a spherical IOL, while the measured total corneal astigmatism values suggested implanting a toric IOL to minimize the postoperative residual astigmatism. Not only this, we also encountered …

A Hierarchical Harmonic Control Method for Wind Power Plants in Microgrids

Authors

Shuting Li,Jingxuan Wu,Gibran D Agundis-Tinajero,Sanjay Chaudhary,Juan C Vasquez,Josep M Guerrero

Published Date

2023/10/16

For multibus wind power plants in microgrids, it is challenging to develop a reliable, effective, and robust harmonic suppression method for harmonic voltages and currents of all buses. This paper proposes a hierarchical harmonic control method to mitigate the harmonic voltages and currents of all buses in grid-forming wind power plants. The proposed method effectively reduces the terminal harmonic voltages and currents, PCC harmonic voltage, and grid harmonic current. It achieves adaptive harmonic mitigation and automatic harmonic current sharing between wind turbine units according to the rated capacity and feeder impedance of each unit. The effectiveness of the method is verified in the planned Turkish offshore wind power plant by simulation in Digsilent/PowerFactory.

Early pigment dispersion and raised intraocular pressure after uneventful central-hole implantable collamer lens surgery

Authors

Sanjay Chaudhary,Hema Mehra,Shanu Kumar Mittal,Alka Pandey

Journal

JCRS Online Case Reports

Published Date

2023/7/1

Conclusions:The excessive pigment dispersion seen after ICL surgery is not commonly encountered after ICL surgery and can be managed conservatively.

Active damping for dynamic improvement of multiple grid-tied virtual synchronous generators

Authors

Yun Yu,Sanjay K Chaudhary,Gibran David Agundis Tinajero,Luona Xu,Juan C Vasquez,Josep M Guerrero

Journal

IEEE Transactions on Industrial Electronics

Published Date

2023/5/22

To eliminate low-frequency oscillations, this article proposes an active-damping method for multiple grid-tied virtual synchronous generators (VSGs) in a power plant. First, using Lyapunov’s indirect method, the damping ratio of multiple VSGs in parallel is analyzed. The average damping ratio reveals that this multi-VSG power plant can be poorly damped in a wide range of inertia and damping settings. Then, self- and mutual-damping controllers are developed to suppress self- and mutually induced low-frequency power oscillations, respectively. For practical implementation, an adaptive tuning algorithm that enables automatic realization is proposed. Through a reassessment, a remarkable damping-ratio improvement is validated. Moreover, the inertial response improvement is validated by the frequency response analysis. Finally, simulations in Digsilent/PowerFactory and experiments are performed to demonstrate …

Fractional order virtual synchronous generator

Authors

Yun Yu,Yajuan Guan,Wenfa Kang,Sanjay K Chaudhary,Juan C Vasquez,Josep M Guerrero

Journal

IEEE Transactions on Power Electronics

Published Date

2023/2/13

In this letter, a novel control scheme is proposed by combining the fractional-order control and the virtual synchronous generator, whereby more degrees of freedom are involved in the controller design. A well-damped power control without oscillations is achieved. At the same time, a significant improvement in the inertial effect is attained. Both theoretical and experimental results have validated the feasibility.

Minigrids for Rural Electrification in Ethiopia

Authors

Sanjay K Chaudhary,Ying Wu,Baseem Khan,Juan C Vasquez,Josep M Guerrero

Published Date

2023/12/14

Despite the presence of sufficient renewable energy resources, several remote villages in Ethiopia do not have access to electricity due to lack of grid connection. In this context, three remote villages which are far from the power grid network has been selected and this paper proposes the development of minigrids for harnessing electricity supply from locally available renewable energy resources and cater to the villagers demand. A techno-economic analysis is performed for the design of the individual minigrids such that the cost of energy can be minimized. It is found that the cost of energy can be significantly reduced by designing for a higher capacity shortage.

The opportunity cost of managing toric intraocular lens rotation cases for a private cataract surgery center in India: A decision-analytic model comparing three toric …

Authors

Sanjay Chaudhary,Jun Zhang,Arindam Dey,Prashanth Prabhuswamy

Journal

CLEVER Clinical and Experimental Vision and Eye Research

Published Date

2023

Aim: This study estimated the opportunity cost and post-operative chair and operating time with toric intraocular lens (IOL) repositioning surgery in a single private surgical center in India.Methods: A decision-analytic model estimated the annual number of cataract surgeries with toric IOL implantation and compared the number of cases requiring repositioning surgery. The model considered three scenarios, each with the utilization of a different toric IOL including AcroSof toric (Alcon Laboratories, Inc.), TECNIS toric (Johnson and Johnson Vision, Inc.), and HOYA 355 toric (HOYA). Each repositioning case resulted in an opportunity cost and lost chair and surgery time as the private surgical center was responsible for conducting and absorbing the cost for the repositioning surgery. Repositioning rates for AcrySof® toric (0.2%), TECNIS toric (1.8%), and HOYA 355 (1.94%) were derived from the literature. The opportunity cost (₹ 45,000) and post-surgical chair and operative time (60 min) were provided through expert opinion. All costs are reported in 2022 Indian Rupees. Results: The base case scenario analyzed an annual volume of 250 cataract surgeries with toric IOL implantations. AcrySof® toric IOL had 0.5 repositioning cases at an opportunity cost of₹ 22,500 and additional surgical and chair time of 30 min. Compared to TECNIS toric and HOYA 355 toric, AcrySof® toric IOL resulted in fewer cases (− 4.0 and− 4.4, respectively), associated opportunity costs (₹ 180,000 and₹ 195,750, respectively), and time saved (240 and 261 min, respectively). Conclusion: A single surgery center in India could reduce opportunity costs and the time associated …

A Decomposed Harmonic Current Suppression Method for VSG-Based Microgrids Connected to Distorted Grids

Authors

Shuting Li,Jingxuan Wu,Gibran D Agundis-Tinajero,Sanjay K Chaudhary,Juan C Vasquez,Josep M Guerrero

Journal

IEEE Transactions on Industrial Electronics

Published Date

2023/11/28

For virtual synchronous generator (VSG) based microgrids, it is challenging to address the adverse effect of nonlinear loads and grid background harmonics with existing harmonic suppression methods. To address this issue, a decomposed grid harmonic current suppression (DHS) method with proper feedforward point of common coupling voltage and feedback VSG output current as well as nonlinear load current is proposed for VSG-based microgrids. The proposed DHS method can separately mitigate the grid harmonic current caused by nonlinear loads and grid background harmonics, obtaining a promising harmonic suppression effect without potential system instability problem. Compared with conventional harmonic control methods, the DHS method reduces the control sensitivity to system parameters including line impedance, grid impedance, and system shunt capacitance, improving the adaptivity of …

A Review of Grid Code Requirements for the Integration of Renewable Energy Sources in Ethiopia

Authors

Baseem Khan,Josep M Guerrero,Sanjay Chaudhary,Juan C Vasquez,Kenn HB Frederiksen,Ying Wu

Published Date

2022/7/18

Rapid integration of renewable energy into the electric grid has ramifications for grid management and planning. Therefore, system operators have formulated grid code requirements to ensure that the grid continues to operate in a secure, safe, and cost-effective manner. The current state of grid code in Ethiopia, as well as the need for it, is discussed in this article. It lays out the technological grid integration requirements, with a focus on small and microgrids, which are especially important for the integration of renewable. The barriers to grid code normalization and renewable energy grid compatibility testing are identified, and suggestions for continued grid code development in Ethiopia based on Danish observations are provided. Further, a detailed comparative analysis of the Ethiopian grid code with the IEEE 1547-2003 and IEEE 1547-2018 standards is presented.

A reference-feedforward-based damping method for virtual synchronous generator control

Authors

Yun Yu,Sanjay K Chaudhary,Gibran David Agundis Tinajero,Luona Xu,Nur Najihah Binti Abu Bakar,Juan C Vasquez,Josep M Guerrero

Journal

IEEE Transactions on Power Electronics

Published Date

2022/2/18

The virtual synchronous generator (VSG) control has been extensively applied for realizing grid-friendly interconnections of power converters. Nevertheless, due to the direct shaft dynamics emulation, low-frequency power oscillations may be introduced in the case of limited damping effects. To solve this issue, power control law modifications have been proposed based on the feedback control theory. Although power oscillations can be suppressed to an acceptable level, the original inertial response of the VSG will be significantly degraded. This letter proposes a new damping method based on the reference feedforward control. The proposed method is able to effectively attenuate poorly damped power oscillations in VSG-controlled converters without affecting the original inertial response. Theoretical analysis and effectiveness of the proposed damping method have been validated by both electromagnetic …

EE140 The Opportunity Cost of Managing Toric IOL Rotation Cases for a Private Cataract Surgery Centre in India: A Decision-Analytic Model Comparing Three Toric IOLs

Authors

J Zhang,D O'Boyle,S Chaudhary,R Nandan,A Dey,P Prabhuswamy

Journal

Value in Health

Published Date

2022/12/1

ObjectivesToric IOL rotation post-surgery could impact patient’s visual outcomes leading to unplanned office visits and may require performing Toric IOL repositioning surgery in some cases. The purpose of the analysis is to compare overall clinical workload (post-operative chair-time and operating room time for Toric IOL rotation cases requiring repositioning surgeries) with three hydrophobic acrylic Toric IOLs and estimate opportunity cost for a private Cataract surgery centre in India.MethodsA decision analytic model was developed in MS excel to conduct the analysis. Toric IOL repositioning surgery incidence rate for AcrySof (0.2%), Tecnis (1.80%) and Hoya (1.94%) Toric IOLs was sourced from a published study. Annual volume of cataract surgeries with Toric IOLs (N= 250) at the centre, overall clinical workload ie, post-operative chair-time and operating room time for each case requiring Toric IOL repositioning …

Accuracy Assessment of Reduced-and Full-Order Virtual Synchronous Generator Models Under Different Grid Strength Cases

Authors

Yun Yu,Sanjay K Chaudhary,Jose Matas,Luona Xu,Gibran David Agundis Tinajero,Juan C Vasquez,Josep M Guerrero

Published Date

2022/10/17

The virtual synchronous generator (VSG) has been extensively applied for the integration of distributed generators. For the benefit of analysis, both the reduced-order small-signal model (RSM) and full-order small-signal model (FSM) have been proposed; however, because of the different modeling approaches, the modeling accuracy may differ a lot. To provide a guideline for selecting a suitable model, an accuracy assessment has been conducted in this paper, where different grid strength cases and equilibrium points are considered. More specific, the eigenvalue analysis is adopted for comparing the dominant dynamics of the RSM and FSM. Afterwards, the responses of the RSM and FSM are compared with the nonlinear model (NM) in the Digsilent/Powerfactory to show the modeling accuracy. It has been found that the RSM is mainly suitable for the weak and relatively strong grids, while the FSM shows better …

Impacts of large-scale offshore wind power plants integration on Turkish power system

Authors

Yunus Yalman,Özgür Çelik,Adnan Tan,Kamil Çağatay Bayindir,Ümit Çetinkaya,Merden Yeşil,Mevlüt Akdeniz,Gibran David Agundis Tinajero,Sanjay K Chaudhary,Josep M Guerrero,Baseem Khan

Journal

IEEE Access

Published Date

2022/8/5

In this paper, the impacts of large-scale OWPPs penetration on the Turkish power system are addressed. The grid compliance analyses for the large-scale OWPP integration are carried out by using the grid connection criteria defined in the Turkish grid code. PV and QV curves are obtained to assess the effect of OWPP on the static voltage stability limit. Eight scenarios are conducted to analyze the effect of the OWPP on the static and dynamic characteristics of the power grid. To observe the large-scale OWPP impact on the voltage and frequency stability, transient events such as the outage of conventional power plants and three-phase to ground faults are applied. The results of the voltage and frequency stability analysis reveal that the Turkish grid remains stable after the integration of an 1800 MW OWPP. Furthermore, the Turkish system remains stable even in the event of an outage of the international …

Grid code requirements–A case study on the assessment for integration of offshore wind power plants in Turkey

Authors

Özgür Çelik,Yunus Yalman,Adnan Tan,Kamil Çağatay Bayındır,Ümit Çetinkaya,Mevlüt Akdeniz,Sanjay K Chaudhary,Majbrit Høyer,Josep M Guerrero

Published Date

2022/8/1

The increasing role of offshore wind power plants in the electricity generation mix in Turkey raises some critical grid operation issues. In this context, the grid code regulation concerning penetration of large-scale offshore wind power plants into Turkey’s power system has become a prominent factor in the development of a reliable grid operation. In this paper, a comprehensive benchmark for grid codes of the European countries that have large-scale offshore wind power plants and Turkey is performed by considering voltage regulation, frequency regulation, fault ride-through, and power quality features. The compatibility of the grid codes in terms of the minimum technical requirements is discussed to show the pros and cons. An elaborated assessment of the Turkish grid code reveals the technical properties that need to be improved. The rigorous state-of-the-art review indicates that active power control & frequency …

Modeling and mitigation control of the submodule-capacitor voltage ripple of a modular multilevel converter under unbalanced grid conditions

Authors

Songda Wang,Danyang Bao,Gustavo Gontijo,Sanjay Chaudhary,Remus Teodorescu

Journal

Energies

Published Date

2021/1/28

A modular multilevel converter’s (MMC’s) submodule (SM)-capacitor voltage will increase under unbalanced grid conditions. Depending on the imbalance level, the voltage ripple can be considerably high, and it can exceed the pre-defined safe limits. If this occurs, the converter will trip, which can lead to serious stability problems for the grid. This paper first proposes an analytical solution for deriving the three-phase imbalanced SM ripple of an MMC under an unbalanced grid. With this analytical tool, the imbalance mechanism of the SM voltage ripple can be easily understood. What is more, the symmetrical component method is first applied to analyze the three-phase SM capacitor ripple, and the positive-/negative-/zero-sequence components of the three-phase SM voltage ripple are easily identified by the proposed analytical method. Then, based on this powerful analytical tool, the proper circulating-current profile to be injected can be obtained, allowing for the right compensation of the voltage ripple. Based on this approach, two new voltage ripple compensation methods are proposed in this paper. Simulations were carried out to validate the analytical description of the submodule-capacitor voltage ripple proposed in this paper. Moreover, simulation and experimental results are provided to validate the new compensation techniques introduced in this paper.

A comparison of fixed-parameter active-power-oscillation damping solutions for virtual synchronous generators

Authors

Yun Yu,Gibran David Agundis Tinajero,Sanjay K Chaudhary,Luona Xu,Nur Najihah Binti Abu Bakar,Josep M Guerrero,Juan C Vasquez

Published Date

2021/10/13

In order to emulate the frequency support characteristics of conventional synchronous generators (SGs), control algorithms based on the virtual synchronous generator (VSG) have been extensively applied to grid-tied converters. However, in the case that a large inertia is used in VSGs, active power oscillations can be introduced in the transients, due to the lack of enough damping effects. To avoid this phenomena, various solutions with additional damping terms have been proposed. This paper analyzes and compares six relevant fixed- parameter active-power-oscillation damping solutions in detail, where responses under set point and phase angle changes, the parameter sensitivity, and capabilities of limiting the rate of change of frequency (RoCoF) and attenuating power ripples are included. The results show the advantages and drawbacks of each solution, leading to the conclusion that extra damping terms …

Power Quality Impact of Distributed Energy Resources in Low Voltage Distribution Grids

Authors

Jone Ugarte Valdivielso,Abel Thomas,Jayakrishnan Radhakrishnan Pillai,Sanjay K Chaudhary

Published Date

2021/8/31

The amount of power electronic-based distributed energy resource connected to low voltage grids is increasing at a fast rate. These interfaces can create power quality issues and consequently, affect the system’s equipment and the quality of supply. In this study, the focus is on analysing the harmonic distortion impact of photovoltaic connected through a two-level voltage source inverter with a pulse-width modulation control and electric vehicle connected by a six-pulse rectifier in an existing low voltage grid. The converters are modelled by their Norton equivalent. Moreover, passive filtering is used to mitigate the high amount of harmonic distortion that the selected converters inject into the grid. The results show that the increase in photovoltaic and electric vehicle penetration increases the harmonic distortion at the point of coupling and that the photovoltaics act as an active filter by filtering out the electric vehicle …

Study on extraction of uranyl with t-butyl ammonium chloride-decanoic acid task-specific deep eutectic solvent

Authors

Jisha S Pillai,S Chaudhary,Ashutosh Srivastava

Published Date

2021

[en] Solvent extraction is most commonly used process to separate actinides from spent nuclear fuel (SNF) and has great applications in the nuclear industry. For the sustainable development of nuclear industry, the research on the liquid-liquid extraction (LLE) of actinides from SNF is essential in the back-end processes of nuclear fuel cycle focused on reprocessing and safe management of nuclear wastes. Traditional LLE methods, using organic solvents/extractants and ionic liquids (IL), suffer from disadvantages including high volatility, high flammability, toxicity, poor biodegradability and high cost. To overcome these limitations, new solvents are required for LLE of actinides for the future separations. In this context, Deep eutectic solvents (DESs) have emerged as an interesting type of neoteric solvents in the 21st century and surged as one of the most environmentally benign promising alternatives to the conventional organic solvents and ionic liquids. DES is a type of solvent typically obtained by eutectic mixture of two components, in a suitable molar ratio, acting as a hydrogen bond acceptor (HBA) and hydrogen bond donor (HBD)

Islanded operation of offshore wind power plant using IBESS

Authors

Sanjay K Chaudhary,Remus Teodorescu,Jan R Svensson,Łukasz H Kocewiak,Philip Johnson,Bertil Berggren

Published Date

2021/7/26

The share of renewables in the power system is increasing rapidly. Large offshore wind power plants (OWPPs) are developed at a high pace and conventional fossil fuel-based plants are decommissioned. If the OWPP gets islanded due to any contingency or in the event of a blackout, the whole OWPP will be shutdown. This paper proposes a STATCOM with a battery storage that is located at the point of common connection to an OWPP to enable OWPP energization from a fully discharged state to operate in islanded mode. The STATCOM functionality provides fast and dynamic reactive power management and the battery unit provides active power balancing capability to regulate the frequency in the island. The concept is demonstrated through time-domain simulations on an OWPP model in PSCAD. The results confirm the technical feasibility of the system.

See List of Professors in Sanjay K Chaudhary University(Aalborg Universitet)

Sanjay K Chaudhary FAQs

What is Sanjay K Chaudhary's h-index at Aalborg Universitet?

The h-index of Sanjay K Chaudhary has been 21 since 2020 and 27 in total.

What are Sanjay K Chaudhary's top articles?

The articles with the titles of

Advancing minigrid clusters in Ethiopia: A Multi-Tier Framework for optimal planning and sizing

Calculating the Power of Toric Intraocular Lens using Total Corneal Astigmatism Measured by a Swept-Source Optical Coherence Tomography-Based Device: An Observation which …

A Hierarchical Harmonic Control Method for Wind Power Plants in Microgrids

Early pigment dispersion and raised intraocular pressure after uneventful central-hole implantable collamer lens surgery

Active damping for dynamic improvement of multiple grid-tied virtual synchronous generators

Fractional order virtual synchronous generator

Minigrids for Rural Electrification in Ethiopia

The opportunity cost of managing toric intraocular lens rotation cases for a private cataract surgery center in India: A decision-analytic model comparing three toric …

...

are the top articles of Sanjay K Chaudhary at Aalborg Universitet.

What are Sanjay K Chaudhary's research interests?

The research interests of Sanjay K Chaudhary are: HVDC, FACTS, Offshore Wind, Renewable Energy

What is Sanjay K Chaudhary's total number of citations?

Sanjay K Chaudhary has 2,628 citations in total.

What are the co-authors of Sanjay K Chaudhary?

The co-authors of Sanjay K Chaudhary are Josep M. Guerrero, Remus Teodorescu, Zhe Chen, Juan C. Vasquez Q, Marco Liserre, Weihao Hu.

Co-Authors

H-index: 147
Josep M. Guerrero

Josep M. Guerrero

Aalborg Universitet

H-index: 104
Remus Teodorescu

Remus Teodorescu

Aalborg Universitet

H-index: 91
Zhe Chen

Zhe Chen

Aalborg Universitet

H-index: 90
Juan C. Vasquez Q

Juan C. Vasquez Q

Aalborg Universitet

H-index: 89
Marco Liserre

Marco Liserre

Christian-Albrechts-Universität zu Kiel

H-index: 50
Weihao Hu

Weihao Hu

University of Electronic Science and Technology of China

academic-engine