Dr. Kumar L V S
@gmrit.org
Associate professor and EEE/gmrit
GMR Institute of Technology
Dr.L V Suresh Kumar was born in Kovvada Village, Andhra pradesh,India in 1987. He received the B.Tech degree in Electrical and electronics engineering from JNTU Hyderabad, M.Tech. degrees in power and energy system from the University of national institute of technology, karnataka, in 2010 and the Ph.D. degree in electrical and electronics engineering from GITAM University, Vishakhapatnam, India, in 2020.From 2010 to 2020, he was a Assistant professor in electrical and electronics engineering with the Electrical Engineering Department, GMR Institute of technology,Rajam. He is the author of one book, more than 40 articles. His research interests include renewable energy systems, FACTS, AGC and Electrical system applications.
EDUCATION
Ph.D, M.Tech, B.Tech
RESEARCH INTERESTS
Control system, Power system, Renewable energy systems, multi level inverters , FACTS, Optimization
Scopus Publications
Scopus Publications
D.V.N Ananth, L.V. Sursh Kumar, and D.A. Tatajee
Elsevier BV
With the rapid development in power electronics technologies and solar photovoltaic (PV) cells, the interest in solar PV cell-based electric power generation and other applications is increasing more incredibly. For low power grid or direct load applications, single-stage solar PV inverters without transformers are advantageous. Based on this concept solar single-stage eight switch H8 based transformerless solar PV inverter is proposed. The objective of the work is to present a control scheme for the H8 inverter to have better power handling capability and for independent active and reactive power control. For this, the test system is studied using MATLAB/ SIMULINK software under three cases (i) constant active power and varying reactive power, (ii) varying active power and constant reactive power, and (iii) varying both active and reactive power. The proposed inverter is compared with single-stage solar PV with two switches boost and six switches inverter topology. It is found that power flow ripples and surges are lesser for proposed H8 than with single-stage topology.
Suresh Kumar L V, Padmini Sasapu, Hema Sai Padi, Manasa Namburi, Jyothikrishna Kona, and V S S Tanuja Setti
IEEE
An electric vehicle (EV) is propelled by an electric motor rather than an internal combustion engine, which produces power by burning a mixture of fuel and gases. In order to solve issues like increasing pollution, global warming, the loss of natural resources, etc., such a vehicle is therefore being considered as a potential replacement for current-generation cars. many types of electric vehicles, such as EVs, HEVs, PHEVs, and FCHEVs. Since brushless DC motors (BLDC), particularly in the field of motor control, are becoming more and more popular in a variety of applications. The main goal of this paper is to simulate the speed control of a BLDC motor powered by a fuel cell and a battery using MATLAB/SIMULINK. It also compares the performance of a sinusoidal back EMF motor with a trapezoidal back EMF motor, concluding that the latter is preferable due to its higher efficiency, reduced torque ripple, smooth motion, and dynamic response.
T S L V Ayyarao, Suresh Kumar L V, Padmini Sasapu, and Hema Sai Padi
IEEE
The increasing integration of renewable energy sources in power systems has posed new challenges in maintaining stable frequency control. This paper proposes an optimal load frequency control strategy for a multi-area power system with renewable energy integration using a War Strategy Optimization (WSO) algorithm. The objective function for tuning the PID controller parameters is based on the integral square error criterion, aiming to minimize the deviation between the system’s actual and desired frequencies. The proposed strategy is designed for a two-area power system model, considering the complexities arising from the integration of renewable energy sources. The WSO algorithm is employed to optimize the PID controller parameters, enabling the system to effectively regulate the frequency deviations caused by varying load and intermittent renewable generation.
Yellapragada Venkata Pavan Kumar, Lagudu Venkata Suresh Kumar, Duggirala Venkata Naga Ananth, Challa Pradeep Reddy, Aymen Flah, Habib Kraiem, Jawad F. Al-Asad, Hossam Kotb, and Kareem M. Aboras
Frontiers Media SA
In this study, an investigation of different faults for a wind turbine–based doubly fed induction generator (DFIG) system is studied and the performance using a static compensator (STATCOM) is observed. The DFIG network is connected to a voltage source converter high-voltage dc link with a fault occurring near the wind generator network. The ride through capability of DFIG is promising with STATCOM using the proposed control strategy. The ac and dc voltage and torque oscillations are damped effectively, and improved power flow is observed. The low voltage AC grid fault occurs for an HVDC transmission, and the DFIG performance without and with STATCOM is compared, where the DFIG converter control schemes are developed using the proposed improved field-oriented control (IFOC) method. In this, the reference rotor flux value alters to a new synchronous speed value or a slighter value or a standstill depending on the stator voltage dip due to grid disturbance. This speed variation leads to introducing rotor current at that new rotor slip frequency as there is a change in the rotor speed because of the fault, which further decreases the stator flux dc component. Hence, this dc-offset constituent in the stator flux is alleviated and decays rapidly in scheming the divergence of the speed of the rotor to a new orientation speed with decay in the rotor flux. This operation is done in the inner control scheme of the rotor converter, which is quicker in response to the faults. Apart from this, the stator’s real and reactive power also changes accordingly based on the lookup table mechanism–based closed-loop control action of the pulse generator, and this power change is done in the outer loop. The analysis for DFIG and HVDC operation is verified under different faults without and with STATCOM.
Devendra Potnuru, Lagudu Venkata Suresh Kumar, Bankuru Sonia, Yellapragada Venkata Pavan Kumar, Darsy John Pradeep, and Challa Pradeep Reddy
Institute of Advanced Engineering and Science
Hydropower has been used for many years and is essential to meet the renewable energy ambition of the world at present. In a hydroelectric power plant, voltage and frequency control are required, but, the voltage control could be done on the load side. In the present paper, frequency control using Harris Hawks optimization (HHO) for improved performance has been presented. Simulations are performed on the dynamic model of the hydropower plant and results are compared with the conventional PID that is designed using the Ziegler-Nichols method. The efficacy of the proposed algorithm is also tested at dynamic conditions of the hydropower plant.
V. Suresh Kumar Lagudu, Duggirala Venkata Naga Ananth, and Sreedhar Madichetty
Informa UK Limited
Duggirala Venkata Naga Ananth, V Suresh Kumar Lagudu, and Sreedhar Madichetty
Informa UK Limited
The High Voltage DC Transmission (HVDC) transmission system commissioned in 1954 was planned for meeting the objectives like economy, faster recovery rate, frequency conversion, bulk power transmis...
D. V. N. Ananth, Lagudu Venkata Suresh Kumar, Tulasichandra Sekhar Gorripotu, and Ahmad Taher Azar
IGI Global
Short-term load forecasting (STLF) is an integral component of energy management systems. In this paper, fuzzy logic-based algorithm is used for short-term load forecasting. The load changes over time and the goal is to satisfy the shift in demand and to maintain a fault as low as possible between the reference and real powers. The error in the load demand in mega-watt (MW) is compared with proposed technique as well as conventional methods. Three cases were investigated in which the load changes were 1) more random in nature, but the variance to the reference was more; 2) the random load changes were simpler, but a little different from the reference; and lastly, 3) the load changing was random, and the reference deviation was maximum. The results are analyzed for different load changes, and the corresponding results are verified using MATLAB. The deviation of the error value in load response is less experienced with a fuzzy logic controller than with a traditional system, and in fewer iterations, the objective function is also achieved.
L.V. Suresh Kumar, D.V.N. Ananth, Y. V. Pavan Kumar, D. John Pradeep, Ch. Pradeep Reddy, and Ezendu Ariwa
Deanship of Scientific Research
L. V. Suresh Kumar, Tummala S. L. V. Ayyarao, and Tulasichandra Sekhar Gorripotu
Springer Singapore
L. V. Suresh Kumar and U. Salma
Informa UK Limited
ABSTRACT Transmission and distribution conversion operation, voltage, current magnitude variation and time-to-time power flow change through grid are the major issues in power system. Variable wind energy system is more popular for power generation through conventional converters and hence harmonic reduction is very less in these converters. In this paper, 9 MW modular multi-level converter-based DFIG wind energy power system parameters are compared with 9 MW DFIG systems using conventional converter. DFIG is operated in four mode condition with proper back-to-back power electronic converters and controllers. In power electronics, the modular multi-level converters are more advanced for reducing transients, peak response oscillations and improving the efficiency of the system. A five-level MMC has been applied in back-to-back converter with phase disposition (PD) PWM technique for DFIG wind system of the same rotor side controller and grid side controller. A conventional converter-based DFIG wind energy system is replaced with five-level MMC-based system with level shift PD-PWM technique. The impact of MMC on DFIG wind energy system is reduced voltage and current harmonics fast settling time compared to conventional converter-based DFIG system. The above MMC DFIG power system voltage is balanced at fault condition with MMC-STATCOM.
L. V. Suresh Kumar, D. V. N. Ananth, M. Premkumar, and R. Sudhir
Union of Researchers of Macedonia
Ch. Santosh Kumar and L.V. Suresh Kumar
IEEE
This paper essentially an introduction of power electronic and its appliances with the assertion on wind turbine systems. There is the far-reaching stretch use of wind turbines for power generation technologies. So progressively more power electronics stand-in as an intensity plant are connected instantly to the transmission and distribution systems. The tolerable induction generator is placed a vital role in power networks, prosperous power electronics systems and rein in methods declare to be introduced to get better efficiency of wind turbine system. This paper gives an analysis of suitable power electronic multilevel converter topologies for the latest wind energy system has been discussed with generators. As well as the corresponding power electronics converters are the reviewed and compared, current matrix converters more suitable technologies for renewable energy sources conversion and control purpose.
L. V. Suresh Kumar and O. Sunil Teja
IEEE
In distributed energy Fuel cell is one of the most valuable source in the renewable energy system because of its higher energy density, higher dependability and more life span due to no moving parts. These are popular because they can afford continuous power throughout the day in all seasons as long as the continuity of fuel cell supply is maintained compared to other renewable energy resources. In the fuel cell classifications proton exchange membrane fuel cell is a more convenient selection for distributed energy sources due to low temperature, fast reaction, and zero emission. The main aim of this work is to reduce harmonic distortion in entire system. Some multilevel converters are technically popular so that it is to integrate to fuel cell outputs, for reduction of harmonics and increase the efficiency. Diode clamped multilevel inverter is interfaced with proton exchange membrane fuel cell, and alternative phase opposition disposition technique is duration modulation switching technique used which employs diversified reference signals for the multilevel converter and reduce some of the harmonic content present in it. The remaining harmonics are mitigated by the low pass filter. This paper presents proton exchange membrane fuel cell with diode clamped multilevel inverter interconnecting to grid which reduces the Total Harmonic Distortion were performed and simulated in MATLAB/Simulink.
L. V. Sureshkumar and U. Salma
Springer Singapore
Renewable energies play a major role in power networks and have several advantages: Wind energy generation is almost pollution free; similarly, fuel cells and photovoltaic cells have several advantages over the other conventional methods. Harmonics are interacting with advanced converters which affect both the distribution system equipment and the loads connected to it. The objective of this paper is to tune PID controller gains for a new stand-alone multi-winding transformer (MWT) connected to load through a multi-level converter (MLC), using differential evaluation algorithm for the minimization of the harmonics. A five-level diode-clamped multi-level inverter (MLI) to operate with advanced five-level switching schemes is used to control the variable wind power voltage with PID controller through the multi-winding transformer. The effect of MLC switching operation on the total harmonic distortions (THDs) is analyzed for different pulse width modulation (PWM) techniques like sinusoidal PWM, phase opposition disposition (POD), anti-phase opposition disposition (APOD), and phase disposition (PD). The results are presented and analyzed to ascertain the effectiveness of the best switching scheme for the minimization of the harmonics with DE algorithm.
Suresh Kumar L. V. and Nagesh Kumar G. V.
Wiley
Summary
Grid-connected photo voltaic (PV) systems are being developed very fast and systems from a few kW to tenths of a MW are now in operation. As an important source of distributed generation (DS) the PV systems need to comply with a series of standard requirements in order to ensure the safety and the seamless transfer of the electrical energy to the grid. Multilevel voltage source converters (VSC) is a heart of the PV system and are emerging as an important power converter options for low, medium, and high-power applications. These VSCs have bought numerous advantages, especially in renewable energy systems such as PV and wind energy systems. In this article, several topologies of VSCs, which brings together some concepts from traditional converters and multi-level converters, are presented. Also, several control strategies for controlling current, voltage, active power and reactive power have also been reviewed. Various topologies with their technical aspects have been reviewed and the best suitable topology and control scheme for grid connected PV and wind energy systems has been suggested. Copyright © 2016 John Wiley & Sons, Ltd.
L.V. Suresh Kumar, G.V. Nagesh Kumar, and Sreedhar Madichetty
Elsevier BV
Abstract The increasing portion of wind energy in the power system puts forward stability challenges to the power grid. With introduction of wind generating systems, maintaining constant frequency became one of the important problems taking stability into account. The system could be maintained with constant frequency with the help of controllers. The controller gains are usually designed with fixed values for various scenarios of power system which considerably vague due to existing system complexity. Also, the usage of conventional techniques consumes a lot of computational time and does not possesses accurate control gain parameters. To address the aforementioned challenges, an automatic online gain estimation algorithm by using pattern search optimization technique has been proposed in this article. This method computes the parameters on its own based on variable wind power output and controller gains will adjust automatically to achieve the best desired performance. The proposed method was tested in a modified IEEE 39 bus system for scenarios like system with 3% and 10% GRC (Generator Rate Constraint) with 10% and 20% SLP (Step Load Perturbation). Following that the system with proposed method was investigated with variable wind power and results demonstrate significant better results which comply with IEEE standards.
Sreedhar Madichetty, A. Dasgupta, and L.V. Suresh Kumar
Elsevier BV
Abstract This article demonstrates the maiden application of a new Modular Multi level Converter based Series Compensation (MMCS) technique for multi area Automatic Generation Control (AGC) interconnected system. Primarily MMCS has been modeled in state space form and proposes an appropriate location in AGC to obtain the better dynamic responses in frequency, tie-line power and individual generating power; further to quench the oscillation for sudden changes in load. The system has been studied the operation of MMCS and investigated with Generation Rate Constraints (GRC) of reheat turbines used in system. Further, selection of suitable integral and proportional–integral controller gain has been investigated with Integral Square Error (ISE) technique and Particle Swarm Optimization (PSO) technique for step load perturbation (SLP) in area-1 with performance index as its objective function by making control parameters as variables. System with MMCS is compared with out MMCS and observed performance has been increased and results are explored.
Sambeet Mishra, Ivo Palu, Sreedhar Madichetty, and L.V. Suresh Kumar
Wiley
Summary
Nowadays, renewable energy systems have come up with more potential in power generation so as to meet the power demand. Among all the renewable systems, the wind energy generating system is believed to be at the peak. However, the wind energy-based microgrid system is associated with many problems such as fluctuations in output voltage due to the fluctuated wind speeds and harmonics generations in the system. To address these issues, this article proposes a new method in order to achieve harmonic mitigation across its output by maintaining constant voltage. Nevertheless, particular attention has been given to the form and function of modular multilevel converter with multi-winding transformer connected to the grid. Modular multilevel converter has been implemented with an advanced voltage controller tuned to control the voltage at its output. Also, a new system topology has been introduced with two wind turbines that are interconnected to multi-winding transformer through asynchronous generators. The proposed system has been implemented with constant and variable wind speeds, and their respective results have also been analysed. The proposed scheme shows its effectiveness by theoretical calculations, verified by simulation and experimental results. Copyright © 2016 John Wiley & Sons, Ltd.
Prasanna P. S., Sreedhar M., and Suresh Kumar L. V.
IEEE
The modular multilevel converter (MMC) is a highly efficient multilevel converter topology suitable for high and medium voltage applications. However, one of the negative traits of MMC is the existence of circulating current. The detrimental effects of circulating currents include distortion in arm voltages, converter power loss and high switching stresses on semiconductor devices. This paper aims to focus on different circulating current mitigation techniques and their comparative analysis. This paper also proposes a circulating current suppressing controller (CCSC) which depends upon the repetitive control (RC) to minimize the inner circulating current in an MMC. The proposed model is simulated in MATLAB/Simulink and the results are quite in proximity with theoretical analysis.
L. V. Suresh Kumar, G. V. Nagesh Kumar, and P. S. Prasanna
Springer India
This paper discusses differential evolution algorithm for tuning of proportional integral controller in modular multilevel converter based STATCOM applications. Unlike conventional VSC based converters, an MMC is known for its distinctive features such as modularity, low harmonic content and flexibility in converter design. The MMC-STATCOM is capable of reactive power compensation, simultaneous load balancing and harmonic cancellation. Differential evolution algorithm is used to tune the proportional integral controller of STATCOM. The proposed model is verified in MATLAB/Simulink and the results are well in proximity with the theoretical analysis.
L. V. Suresh Kumar, G. V. Nagesh Kumar, and D. Anusha
Springer India
The summary of the paper explains the optimal tuning of integral (I) and proportional integral (PI) controllers are applied to closed loop standalone integrated multi wind energy system by using particle swarm optimization. Tuning of I and PI controller gain values obtained from the optimization techniques to get the best possible operation of the system. For the optimal performance of the integrated wind energy system, the controller gains are tuned by using the PSO and genetic algorithms (GA). The system harmonics of voltage responses are observed with search heuristic algorithm that is nothing but a genetic algorithm. Similarly the system responses are observed and compared with PSO algorithm, and the PSO algorithm is proved better. The results establishes the proposed new stand alone multi wind energy system with I, PI controller gains are tuned by using PSO will gives less harmonic distortion and improves performance. The proposed system is developed in MATLAB/SIMULINK.