Dr. G Siva Kumar received a B.Tech degree in Electrical and Electronics Engineering from G. Pulla Reddy Engineering College, Kurnool, India, in 2001; the M.Tech degree in Power Electronics from Jawaharlal Nehru Technological University College of Engineering, Hyderabad, India, in 2004; and the Ph.D. degree in Electrical Engineering from the Indian Institute of Technology, Madras, India, in 2013.
He works as an Associate Professor in the Department of Electrical Engineering at the National Institute of Technology, Warangal, India. His research interests include power quality, renewable energy systems, multi-level inverters, and AC microgrids.
Dr. G. Siva Kumar received the POSOCO Power System Award from the Power Grid Corporation of India and the Foundation for Innovative and Technology Transfer, IIT Delhi, New Delhi, India, in 2013 for his research work. He is currently the Vice Chair (Interim-Slate 2023) of the PES/IAS/PELS Joint Chapter of the IEEE Hyderabad Section, India
EDUCATION
B.Tech (Electrical and Electronics) from G. Pulla Reddy Engineering College (Autonomous), Kurnool, 2001.
M.Tech. (Power Electronics) from JNTUH College of Engineering (Autonomous), Hyderabad, 2004.
Ph.D. from Indian Institute of Technology Madras, Chennai, 2012.
RESEARCH, TEACHING, or OTHER INTERESTS
Electrical and Electronic Engineering, Renewable Energy, Sustainability and the Environment
40
Scopus Publications
1019
Scholar Citations
15
Scholar h-index
18
Scholar i10-index
Scopus Publications
Chopper-Based Capacitor Voltage Equalization in Four-Switch Split Capacitor Distribution Static Compensator With a Zig-Zag Transformer Gajangi Arun Kumar, Ganjikunta Siva Kumar, Koyyana Srinivasa Rao, Chinna Karasala International Journal of Circuit Theory and Applications, 2025 A three‐phase four‐switch split capacitor distribution static compensator (FSSC‐DSTATCOM) with a zig‐zag transformer is used to mitigate current‐related power quality issues in the distribution system. In conventional DSTATCOM, a significant dc component of current diverges voltages across split capacitors, degrading the current tracking performance and increasing the source current THD. The proposed FSSC‐DSTATCOM with chopper circuit equalizes the voltages across split capacitors, improves the current tracking performance, and reduces the source current THD. Moreover, FSSC‐DSTATCOM reduces the switch count compared to conventional approaches that use more switches. In FSSC‐DSTATCOM, switching pulses for each switch are generated using hysteresis current control based on the reference filter currents derived from instantaneous symmetrical component theory (ISCT). The generation of switching pulses of chopper circuit is achieved by employing logical relational operator circuitry at the dc input side of DSTATCOM. Simulation and hardware implementation are used to verify the proposed FSSC‐DSTATCOM with the chopper circuit.
An improved PWM with simplified unified switched logic (USL) for RSC MLIs V. Hari Priya, D. Sreenivasarao, G. Siva Kumar International Journal of Electronics, 2024 Inevitability to reduce the size, cost and complexity of multilevel inverter (MLI) to evolve simplified RSC (Reduced switch count) MLIs has created diversified effects such as limited switching redundancies which further restricted modularity and flexibility of implementing PWM schemes. Among the PWM schemes of RSC-MLIs, modified reduced carrier (MRC) PWM with unified switching logic (USL) is the simplest and claims to be superior with the state of art in terms of implementation, line harmonic performance, imposing least controller computational burden (of 6.5 µS to realise a three-phase seven-level RSC-MLI) by adapting minimal carrier constraints. However, this is valid for sophisticated digital controllers such as dSPACE MicroLabBox, but not for low-end cost-effective controllers such as dSPACE1104 (imposing a computational burden of nearly 25 µS to control a single-phase RSC-MLI). Thus, this paper proposes an improved USL which adopts no carrier constraints and operates with less computational burden over the conventional USL. The proposed USL gives flexibility to the user to implement a part of the switching logic with analogue circuits and thereby avoid the requirement of high-end digital controller. The scalability and superiority of the proposed USL is demonstrated for symmetrical and asymmetrical configurations of popular cascaded T-type RSC-MLI. Efficacy of the proposed USL is demonstrated with dSPACE 1104 controller and dSPACE FPGA R&D Micro-lab Box.
Adaptive DC-Link Voltage-Controlled PV Grid-Connected DTL-VSI with Reduced Switching Losses and Switching Frequency Koyyana Srinivasa Rao, Ganjikunta Siva Kumar, Chinna Karasala IEEE Journal of Emerging and Selected Topics in Power Electronics, 2024 This article discusses, a photo-voltaic (PV) grid connected dual two-level voltage source inverter (GCDTL-VSI) to improve the power quality, reliability, and efficiency of the grid. In PVGCDTL-VSI, VSI-1 is employed to compensate the current related power quality concern, while VSI-2 is employed to transfer real power to the load and grid. In literature, the dc-link voltage maintains constant at the input terminal of VSI-1 under low power injection. As a result, there will be significant switching losses and stress on the inverter switches. In the proposed method, VSI-1 with LC-filter, and an adaptive dc link voltage control technique is used to alleviate the switching losses and stress on the inverter switches. Additionally, the two-leg VSI employs for supply real power to the load and grid instead of the conventional approach uses three-leg VSI. In PVGCDTL-VSI, a model predictive control (MPC) with multiconstraint technique is used to generate the switching pulses, dc-link capacitor voltage balancing, and reduce switching frequency. To reduce the weighting factor control complexity, Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) approach is employed in PVGCDTL-VSI. To evaluate the effectiveness and performance of the PVGCDTL-VSI, are carried out simulation and experimental tests.
MPC Based TLSC-DSTATCOM with VIKOR Approach to Reduce Switching Frequency and Capacitor Voltage Balancing Koyyana Srinivasa Rao, Ganjikunta Siva Kumar, Aman Saxena, Chinna Karasala IEEE Transactions on Power Delivery, 2024 In this paper, a three-leg split capacitor distribution static compensator (TLSC-DSTATCOM) with chopper circuit is used to mitigate current related power quality issues in the distribution system. In conventional TLSC-DSTATCOM, the split capacitor voltages are unbalanced and switching frequency is high under DC load conditions, which leads to increases in source current THD and switching losses. In order to balance the split capacitor voltages during DC load conditions, a TLSC-DSTATCOM with chopper circuit is used in the proposed method. TLSC-DSTATCOM is controlled using model predictive control (MPC) to increase the steady state response, and control of the chopper circuit is based on the predicted dc link voltage from the optimal switching state and the reference dc link voltage. High switching frequency is a limitation of MPC, considering switching frequency as a cost function with a weighting factor to minimizing switching frequency of voltage source inverter (VSI). When considering two or more cost functions in MPC, it will be difficult to select optimal weighting factors for the intended output. To minimize the complexity of the weighting factor tuning, VlseKriterijumska Optimizacija I Kompromisno Resenje (VIKOR) technique is used in TLSC-DSTATCOM. The proposed method is validated using simulation and experimental tests.
PV Grid-Connected Inverter With DC Voltage Regulation in CCM and VCM Operation to Reduce Switching Losses Chinna Karasala, Rakesh Rao Lekkala, Hareesh Myneni, Siva Kumar Ganjikunta IEEE Transactions on Industrial Electronics, 2023 In this article, a photovoltaic (PV) grid-connected inverter (GCI) is employed for multifunctional control [i.e., real power flow control from PV panels, mitigation of current, and voltage-related power quality (PQ) problems], and the GCI input reference dc voltage is formulated as a function of GCI output currents for loss reduction during low currents through inverter switches. In the latest literature, the PV GCI is used for mitigating current-related PQ problems, and it is also used for mitigating minor voltage-related PQ problems (voltage sag, voltage swell, and voltage imbalance). During voltage sag conditions, GCI output current is high enough to maintain rated voltage at the point of common coupling, and in this case, the reference dc voltage requirement is high. However, during rated grid voltage condition, low power generation from PV, and minimum load condition, keeping maximum dc voltage at the input of the GCI leads to heavy burden on GCI switches. In the proposed method, in order to reduce losses in the GCI, the input dc voltage of the GCI is reduced during low GCI output current. The proposed method is validated with a MATLAB simulation and a hardware experiment by comparing data existing in literature with the proposed method.
Model Predictive Control of PVGCI for Reducing Common Mode Voltage and Switching Frequency Chinna Karasala, K. Venkata Panindra, Alladi Pranay Kumar, Siva Kumar Ganjikunta IEEE Journal of Emerging and Selected Topics in Power Electronics, 2023 In this study, the common mode voltage (CMV) of photovoltaic grid-connected inverter (PVGCI) is reduced due to minimal switching constraints and lower PVGCI input dc voltage during low power injection. In the absence of a transformer at the grid side, a high-frequency CMV in PVGCI can cause electromagnetic interference, magnetic saturation, and circulating currents among other things. In the literature on reducing CMV, various topologies, control algorithms, and filter components have been used. The design recommended in the article uses a two-level four-leg inverter with 14 switching states to reduce CMV. The grid current total harmonic distortion (THD) increases as the number of switching states evaluated decreases; however, the approach suggested minimizes the grid current THD by decreasing the dc voltage during low-power flow from PVGCI, and the CMV amplitude is determined by PVGCI input dc voltage, which decreases during low-power injection. A cost function of average switching frequency is considered for decreasing the switching frequency of PVGCI. The suggested approach is simulated in MATLAB simulation, and a hardware experiment is performed in hardware laboratory to demonstrate its superiority over existing models.
DC-Link voltage control of a multifunctional PV-GCVSI to reduce VSI switching losses Chinna Karasala, Alladi Pranay Kumar, Ganjikunta Siva Kumar International Journal of Electronics, 2023 The reference input dc voltage of grid connected voltage source inverter (GCVSI) is altered in this article based on power (both active and reactive) injection from GCVSI for minimising inverter switching losses, and total harmonic distortion (THD) of grid current. If the GCVSI is exclusively used for actual power injection from the photo-voltaic (PV) system to the utility grid, the needed input dc voltage of GCVSI is twice the utility grid phase peak voltage. According to the literature, GCVSI is also used to compensate for power quality issues, and in these circumstances, the dc-link voltage value is determined by the maximum power injection of GCVSI. Under reduced load, and reduced power generation from the PV system, keeping maximum GCVSI input dc voltage reference causes extra voltage stress at GCVSI switches, and the grid current THD is worse due to high ripple current in filter inductance. Therefore, to reduce the inverter switching losses and to improve the grid current THD, the relationship between the GCVSI input dc voltage reference and the power flow from GCVSI has been formulated. The proposed work is verified using simulation studies, as well as hardware studies, and the results are compared with existing methods for validation.
An Adaptive DC-Link Voltage Control of a Multifunctional SPV Grid-Connected VSI for Switching Loss Reduction Chinna Karasala, Siva Kumar Ganjikunta IEEE Transactions on Industrial Electronics, 2022 In the proposed method, to minimize the burden on the switches of multifunctional grid-connected voltage source inverter (MFGCVSI), the voltages of dc link split capacitors are adjusted according to power injection from MFGCVSI. MFGCVSI is used to control active power injection from solar photo-voltaic (SPV) power generation to the main grid and loads, load reactive power compensation, harmonic mitigation, and main grid current total harmonic distortion (THD) within 5%. In such a case, the voltages of split capacitors depends on rated power injection from MFGCVSI. The power generated from SPV system and the loads which are connected at the point of common coupling (PCC) vary with respect to time. It is observed that, the selection of rated dc link voltages during low power injection from MFGCVSI leads to additional switching stress and higher switching losses. Therefore, to reduce the burden on inverter switches and switching losses, the reference dc voltage is reduced under low power injection from MFGCVSI. A model predictive controller with a multi-constraint technique is used in the proposed method for balancing the dc-link capacitor voltages and average switching frequency reduction. The proposed method is validated through simulation and hardware setup.
Variable DC-Link Voltage Control Strategy for Split-Capacitor DSTATCOM Operating in Voltage Control Mode Chinna Karasala, Rakesh Rao Lekkala, Siva Kumar Ganjikunta Icpc2t 2022 2nd International Conference on Power Control and Computing Technologies Proceedings, 2022 This paper proposes a new dc-link voltage control strategy for regulating the voltage at the point of common coupling (PCC) when the DSTATCOM is operating in voltage control mode (VCM). Whenever there is a sag or swell in the system, the DSTATCOM changes its mode from current control mode (CCM) to VCM. In voltage control mode, there is also a possibility that the PCC voltage might vary due to disturbances in the system, load variation etc,. The system must remain robust even during these conditions. The proposed control algorithm ensures that the PCC voltage is maintained within the prescribed limits during the above mentioned cases by varying the dc-link voltage of the DSTATCOM accordingly. The advantage of variable dc-link voltage is that the voltage source inverter (VSI) losses will be reduced greatly compared to the constant dc-link voltage. To validate the proposed method, simulation studies have been carried out on split-capacitor DSTATCOM operating in voltage control mode for PCC voltage regulation.
A survey on reduced switch count multilevel inverters Hari Priya Vemuganti, Dharmavarapu Sreenivasarao, Siva Kumar Ganjikunta, Hiralal Murlidhar Suryawanshi, Haitham Abu-Rub IEEE Open Journal of the Industrial Electronics Society, 2021
Chopper‐Based Capacitor Voltage Equalization in Four‐Switch Split Capacitor Distribution Static Compensator With a Zig‐Zag Transformer G Arun Kumar, G Siva Kumar, K Srinivasa Rao, C Karasala International Journal of Circuit Theory and Applications 53 (10), 6085-6102 , 2025 2025 Citations: 1
MPC Based TLSC-DSTATCOM with VIKOR Approach to Reduce Switching Frequency and Capacitor Voltage Balancing KS Rao, GS Kumar, A Saxena, C Karasala IEEE Transactions on Power Delivery 39 (4), 2435-2445 , 2024 2024 Citations: 4
Installation of UPQC in Radial Distribution System for Enhancement of Voltage Profile NR Battu, GS Kumar, SR Salkuti, K Veeresham, L Abhinandh Energy and Environmental Aspects of Emerging Technologies for Smart Grid … , 2024 2024 Citations: 2
Adaptive DC-link voltage-controlled PV grid-connected DTL-VSI with reduced switching losses and switching frequency KS Rao, GS Kumar, C Karasala IEEE Journal of Emerging and Selected Topics in Power Electronics 12 (4 … , 2024 2024 Citations: 3
DC-Link voltage control of a multifunctional PV-GCVSI to reduce VSI switching losses C Karasala, AP Kumar, G Siva Kumar International Journal of Electronics 110 (8), 1491-1515 , 2023 2023 Citations: 2
An improved PWM with simplified unified switched logic (USL) for RSC MLIs V Hari Priya, D Sreenivasarao, G Siva Kumar International Journal of Electronics , 2023 2023 Citations: 7
Model Predictive Control of PVGCI for Reducing Common Mode Voltage and Switching Frequency C Karasala, KV Panindra, AP Kumar, SK Ganjikunta IEEE Journal of Emerging and Selected Topics in Power Electronics 11 (3 … , 2023 2023 Citations: 6
PV grid-connected inverter with DC voltage regulation in CCM and VCM operation to reduce switching losses C Karasala, RR Lekkala, H Myneni, SK Ganjikunta IEEE Transactions on Industrial Electronics 70 (11), 11262-11275 , 2022 2022 Citations: 18
Capacitor voltage balancing in two-level inverter with split capacitor topology for DSTATCOM application using model predictive control A Saxena, KS Rao, C Karasala, SK Ganjikunta 2022 1st International Conference on Sustainable Technology for Power and … , 2022 2022 Citations: 2
Active and Reactive Power Control of Grid-Tied Asymmetrical MLI-based PV System with Reduced Switching Frequency H Myneni, A Pranay Kumar, SA Mandale, G Siva Kumar Recent Advances in Power Electronics and Drives: Select Proceedings of EPREC … , 2022 2022 Citations: 1
Variable DC-Link Voltage Control Strategy for Split-Capacitor DSTATCOM Operating in Voltage Control Mode K Chinna, L Rakesh Rao, G Siva Kumar 2022 Second International Conference on Power, Control and Computing … , 2022 2022 Citations: 1
An Adaptive DC Link Voltage Control of Multifunctional SPV Grid Connected VSI for Switching Loss Reduction C Karasala, SK Ganjikunta IEEE Transactions on Industrial Electronics , 2021 2021 Citations: 30
A Survey on Reduced Switch Count Multilevel Inverters HP Vemuganti, S Dharmavarapu, G Siva Kumar, HM Suryawanshi, ... IEEE Open Journal of the Industrial Electronics Society 2, 80 - 111 , 2021 2021 Citations: 205
Design, analysis, and switching losses reduction of hybrid shunt compensator with adaptive control scheme H Myneni, G Siva Kumar International Transactions on Electrical Energy Systems 31 (2), e12716 , 2021 2021 Citations: 3
A three-phase transformer based T-type topology for DSTATCOM application HP Vemuganti, D Sreenivasarao, G Siva Kumar International Journal of Electronics 108 (9), 1534 - 1554 , 2021 2021 Citations: 9
Model predictive control with technique for order of preference by similarity to ideal solution method for four leg distribution static compensator to improve power quality and … PK Alladi, G Siva Kumar, S Dharmavarapu International Transactions on Electrical Energy Systems 31 (1), e12688 , 2021 2021 Citations: 4
Model predictive control with constant switching frequency for four leg DSTATCOM using three dimensional space vector modulation A Pranay Kumar, G Siva Kumar, D Sreenivasarao IET Generation, Transmission & Distribution 14 (17), 3571 – 3581 , 2020 2020 Citations: 15
Power quality enhancement by hybrid DSTATCOM with improved performance in distribution system H Myneni, SK Ganjikunta, S Dharmavarapu International Transactions on Electrical Energy Systems 30 (1), e12153 , 2020 2020 Citations: 15
Model Predictive Control of Four Level NNPC DSTATCOM for Power Quality Improvement in Distribution System A Pranay Kumar, G Siva Kumar, D Sreenivasarao IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics … , 2019 2019 Citations: 1
Energy Management and Control of Single-Stage Grid Connected Solar PV and BES System H Myneni, GS Kumar IEEE Transactions on Sustainable Energy , 2019 2019 Citations: 79
MOST CITED SCHOLAR PUBLICATIONS
A Survey on Reduced Switch Count Multilevel Inverters HP Vemuganti, S Dharmavarapu, G Siva Kumar, HM Suryawanshi, ... IEEE Open Journal of the Industrial Electronics Society 2, 80 - 111 , 2021 2021 Citations: 205
Power Quality Improvement and PV Power Injection by DSTATCOM with Variable DC Link Voltage Control from RSC-MLC KK Prasad, H Myneni, G Siva Kumar IEEE Transactions on Sustainable Energy 10 (2), 876 - 885 , 2019 2019 Citations: 107
Mitigation of voltage sags with phase jumps by UPQC with PSO-based ANFIS GS Kumar, BK Kumar, MK Mishra IEEE Transactions on Power Delivery 26 (4), 2761-2773 , 2011 2011 Citations: 103
Energy Management and Control of Single-Stage Grid Connected Solar PV and BES System H Myneni, GS Kumar IEEE Transactions on Sustainable Energy , 2019 2019 Citations: 79
Minimization of VA loading of unified power quality conditioner (UPQC) GS Kumar, PH Vardhana, BK Kumar, MK Mishra 2009 International Conference on Power Engineering, Energy and Electrical … , 2009 2009 Citations: 73
Improved pulse-width modulation scheme for T-type multilevel inverter HP Vemuganti, D Sreenivasarao, GS Kumar IET Power electronics 10 (8), 968-976 , 2017 2017 Citations: 56
Dynamic DC Voltage Regulation of Split-Capacitor DSTATCOM for Power Quality Improvement H Myneni, G Siva Kumar, D Sreenivasarao IET Generation, Transmission & Distribution 11 (7), 4373 – 4383 , 2017 2017 Citations: 50
Reduced carrier PWM scheme with unified logical expressions for reduced switch count multilevel inverters HP Vemuganti, D Sreenivasarao, GS Kumar, AS Spandana IET Power Electronics 11 (5), 912-921 , 2018 2018 Citations: 38
Simple algorithm for current and voltage control of LCL DSTATCOM for power quality improvement H Myneni, GS Kumar IET Generation, Transmission & Distribution 13 (3), 423-434 , 2018 2018 Citations: 36
An Adaptive DC Link Voltage Control of Multifunctional SPV Grid Connected VSI for Switching Loss Reduction C Karasala, SK Ganjikunta IEEE Transactions on Industrial Electronics , 2021 2021 Citations: 30
Optimal VA loading of UPQC during mitigation of unbalanced voltage sags with phase jumps in three-phase four-wire distribution system GS Kumar, BK Kumar, MM Kumar Power System Technology (POWERCON), 2010 International Conference on, 1-8 , 2010 2010 Citations: 30
Model Predictive Current Control of DSTATCOM with Simplified Weighting Factor Selection Using VIKOR Method for Power Quality Improvement A Pranay Kumar, G Siva Kumar, D Sreenivasarao, M Hareesh IET Generation, Transmission and Distribution 13 (16), 3649 – 3660 , 2019 2019 Citations: 27
Compensation of voltage sags and harmonics with phase-jumps through DVR with minimum VA rating using Particle Swarm Optimization RA Kumar, GS Kumar, BK Kumar, MK Mishra Nature & Biologically Inspired Computing, 2009. NaBIC 2009. World Congress … , 2009 2009 Citations: 20
PV grid-connected inverter with DC voltage regulation in CCM and VCM operation to reduce switching losses C Karasala, RR Lekkala, H Myneni, SK Ganjikunta IEEE Transactions on Industrial Electronics 70 (11), 11262-11275 , 2022 2022 Citations: 18
Model predictive control with constant switching frequency for four leg DSTATCOM using three dimensional space vector modulation A Pranay Kumar, G Siva Kumar, D Sreenivasarao IET Generation, Transmission & Distribution 14 (17), 3571 – 3581 , 2020 2020 Citations: 15
Power quality enhancement by hybrid DSTATCOM with improved performance in distribution system H Myneni, SK Ganjikunta, S Dharmavarapu International Transactions on Electrical Energy Systems 30 (1), e12153 , 2020 2020 Citations: 15
Zero-Sequence Voltage Injected Fault Tolerant Scheme for Multiple Open Circuit Faults in Reduced Switch Count based MLDCL Inverter V Hari Priya, D Sreenivasarao, G Siva Kumar IET Power Electronics 11 (8), 1351 - 1364 , 2018 2018 Citations: 14
Three-phase four switch DSTATCOM topologies with special transformers for neutral current compensation and power quality improvement AP Kumar, GS Kumar, D Sreenivasarao IET Generation, Transmission & Distribution 13 (3), 368-379 , 2018 2018 Citations: 13
A three-phase transformer based T-type topology for DSTATCOM application HP Vemuganti, D Sreenivasarao, G Siva Kumar International Journal of Electronics 108 (9), 1534 - 1554 , 2021 2021 Citations: 9
An improved PWM with simplified unified switched logic (USL) for RSC MLIs V Hari Priya, D Sreenivasarao, G Siva Kumar International Journal of Electronics , 2023 2023 Citations: 7
