Ramu Srikakulapu
@nitk.ac.in
Electrical and
Electronics Engineering
NITK Surathkal
Scopus Publications
Scopus Publications
Ramu Srikakulapu, Vivekanandan Subburaj, G. Charan Kumar, M. Dileep Krishna, Abhishek Dasore, and Gyan Sagar Sinha
Springer Nature Singapore
Ramu Srikakulapu, Vivekanandan Subburaj, S. Sujith, Mohammad Shahid, Javed Khan Bhutto, G. Charan kumar, Abhishek Dasore, Abdul Razak, and C. Ahamed Saleel
Elsevier BV
Ramu Srikakulapu, G Sanjay Kumar, P Joanna Parimala, and G Charan Kumar
IEEE
The regulation of interfaced converters with the integration of renewable energy sources (RESs) into the power grid with penetration effect is the subject of this article. Various amounts of RES penetration into the grid are used to present a suitable outcome of this investigation. The simulation findings for grid integration with varying levels of PV penetration are presented. A maximum PV penetration of 50% of peak demand is modelled, with a minimum of 10%. This project examines a variety of faults, including symmetrical and unsymmetrical faults. Two controllers are employed in the control process, one for boost converter with maximum power point tracking and the other for VSC controller. The VSC controller regulates the DC voltage. Inner and outer loops exist in the VSC controller. The current is controlled by the inner loop, while the DC voltage is controlled by the outside loop. With these future scenarios in mind, this paper presents existing solutions as well as new and future options to solve these concerns.
Sanjay Kumar G, Leela Grace U, Ramu Srikakulapu, Poojasree M, Latha V, and Charan Kumar G
IEEE
This paper provides different challenges for Electric Vehicle parking (EVP) in parking lots (PL) along with different parking architectures for proper placing of Electric vehicle (EV) in the PL that would result in Optimised charging conditions for EV in the PL along with the considerations of PL Space optimization, Time Optimization with the help of angled parking slot to adjust the parking slots to certain angle for fast parking and unparking of vehicles, Driver Preferences regarding location of slot in the parking lot that could result in drivers satisfaction keeping Initial cost concerns for power electronic circuitry in mind. This study also includes engineering extensions for existing PL designs of Conventional fuel Vehicles (CFV) that could make the parking lot feasible for EV charging in the parking lots. In this study different designs are proposed like spiral parking lots which could enable vehicles to park on different flowers, also include the case study of using Pythagorean theorem for creating few more spaces in the parking lot, mobile EV charger also proposed to establish temporary PLs in demand prone areas.
Obulesu Mopuri, Raghunath Kodi, Charankumar Ganteda, Ramu Srikakulapu, and Giulio Lorenzini
Akademia Baru Publishing
In the presence of a diffusion thermal and coupled magnet field effect, this manuscript seeks continuous free convective motion by a viscous, incompressible fluid that conducts electrically past a sloping platform via a porous medium. The free flow speed may be compatible with the exponentially tiny disrupting law. Two-term harmonic and non-harmonic functions solve dimensional-less control equations analytically. Detailed graphs are used to determine the budgets for tempo, temperature, and concentration for various limit calculations. Also, the numbers of Nusselt and Sherwood are given and evaluated with the graphs. Its sketches illustrate that the velocity profiles get reduced by the increase of aligned magnetic field parameter (α) and inclined angle parameter (ξ). Temperature profile is accelerated by rising heat absorption, Dufour number and concentration distribution is decelerated by enhancing the chemical reaction and Schmidt number. Heat and mass transfer frequently occurs in chemically processed industries, distribution of temperature and moisture over agricultural fields, dispersion of fog and environment pollution and polymer production. Free convection flow of coupled heat and mass transfer occurs due to the temperature and concentration differences in the fluid as a result of driving forces. For example, in atmospheric flows, thermal convection resulting from heating of the earth by sunlight is affected differences in water vapour concentration.
K Suresh, K Jyotheeswara Reddy, Ritesh Dash, Santoshkumar Hampannavar, Ramu Srikakulapu, and Vivekanandan Subburaj
IEEE
A newly designed universal converter proposes a new approach for power conversion (AC-DC, AC-AC, DC-DC, and DC-AC) using a single circuit. In this work, four topologies are considered simultaneously in a single circuit without changing the circuit design. The topologies of buck and boost operation work on the general topology operation i.e., using an inductor and two capacitors whereas remaining AC-AC, AC-DC and DC-AC conversions work using capacitors and switches. The proposed converter is highly recommended for multiple sources and multiple output operations. Different power ratings can be selected for different topologies for DC-DC or DC-AC conversion it varies from 1 Watt to 10 kW and AC-AC or AC-DC conversion 1 Watt to 10 MW. The Simulation is performed for the universal converter using MATLAB/SIMULINK. The simulation and the model results show good agreement with each other.
Ramu Srikakulapu and Vinatha U
Wiley
Ramu SRIKAKULAPU and Vinatha U
Springer Science and Business Media LLC
A layout of the offshore wind farm (OSWF) plays a vital role in its capital cost of installation. One of the major contributions in the installation cost is electrical collector system (ECS). ECS includes: submarine cables, number of wind turbines (WTs), offshore platforms etc. By considering the above mentioned problem having an optimized design of OSWF provides the better feasibility in terms of economic considerations. This paper explains the methodology for optimized designing of ECS. The proposed methodology is based on combined elitist ant colony optimization and multiple travelling salesman problem. The objective is to minimize the length of submarine cable connected between WTs and to minimize the wake loss in the wind farm in order to reduce the cost of cable and cable power loss. The methodology is applied on North Hoyle and Horns Rev OSWFs connected with 30 and 80 WTs respectively and the results are presented.
Ramu Srikakulapu and U. Vinatha
IEEE
This paper explains a hybrid control approach to model a controller for voltage source converters (VSCs) in offshore wind farm (OSWF) applications, where the OSWFs are integrated to AC grid through the multi-terminal high voltage direct current (MT-HVDC) transmission system. Proper DC link voltage provides the effective power dispatch. So, a constant DC link voltage should be maintained to achieve the effective power dispatch between OSWFs and AC grid. A new control approach is a compound of proportional-integral and sliding mode control to regulate the DC link voltage on the grid side VSC. Also, the proposed control approach can control AC voltage and reactive power on wind farm and grid side VSCs respectively. Time- domain simulations executed in MATLAB/Simulink software are used to verify the proposed and conventional control approaches. Transient stability analysis is carried out for a case study. The three-terminal VSC-HVDC system has taken for study, where two OSWFs are fed to AC grid.
Ramu Srikakulapu and U Vinatha
IEEE
The wind turbine (WT) layout and electrical system layout plays a vital role in offshore wind farm (OWF) design. The wake effect has a significant impact on the power production of the OWF. WTs in wake region will not experience healthy wind; hence it affects the power production. The proper placement of WTs can reduce the wake effect in OWF. The optimal design of large OWF is based on combined approach of Ant colony optimization (ACO) with multiple travelling salesmen problem (MTSP) is presented. The objectives of the approach are to improve power production, minimize the length of cable and cable cost. By considering (a) placement of WT with consideration of wake effect, (b) placement of substation, (c) selection of submarine cables with higher reliability and minimal power loss, and (d) minimum length of WT cable routing with zero cross connection. ACO-MTSP approach is applied on large OWF connected with 280 WTs and results are compared with the outcome of reference OWF.
Ramu Srikakulapu and U Vinatha
IEEE
Permanent magnet synchronous generator (PMSG) based offshore wind farm is connected to the onshore grid by voltage source converter (VSC) — HVDC link. The wind farm side VSC controls the AC voltage, and grid side VSC controls the reactive power and DC link voltage. This paper presents a non-linear control method for improving the robustness of the controller for VSC-HVDC link. A hybrid controller is designed using sliding mode control (SMC) and proportional-integral (PI) control. Mathematical modeling of the hybrid controller is presented. This hybrid controller has the capability of Fault Ride-Through and transient stability of VSC-HVDC link. This hybrid controller is simulated using the MATLAB/Simulink software and it is observed that the controller provides better performance. Transient stability is ensured by creating a symmetrical fault at the grid side in the simulation.
Ramu Srikakulapu and U. Vinatha
IEEE
The green energy revolution has promoted the use of renewable energy sources (RES). The offshore wind energy is taking major share in global wind energy. Large offshore wind farms (OSWs) are experiencing economic challenges as well as wake effect. These issues can be mitigated by optimal design (OD) of OSW. In this paper, a new combo approach based on Firefly algorithm and Travelling salesmen problem is proposed. The wake effect can be nullified by placement of wind turbines (WTs) based on Larsen wake model. The OD of OSW is made by considering the constraints such as, length of the interconnecting cable between the WTs and wake effect on WTs. This minimization of length will decline the cable cost which constitutes major part of the cost of OSW. The proposed method is applied to North Hoyle OSW with thirty WTs considering OD of ring and radial topologies. The estimation of wake effect including value of wake loss and energy production of OSW is explained.
Ramu Srikakulapu and Vinatha U
IEEE
Layout of offshore wind farm (OSWF) plays a major role in capital cost of its installation. The cost of OSWF depends on the cost of electrical collector system which includes, submarine cables, number of wind turbines, offshore platforms etc. The optimal design of OSWF will give better economical outcome. This paper explains the methodology for optimal design of OSWF electrical collector system and cost model of collector system. The methodology is based on the combination of Ant Colony optimization and Travelling Salesman problem. The objective is to minimize the length of submarine cable connected between wind turbines in wind farm. It will reduce the cost of cable and cable power loss. With the help of North Hoyle OSWF connected with 30 wind turbines, the optimization approach designs optimal OSWF based on minimum length of cable for radial and ring topologies.
Ramu Srikakulapu and Vinatha U
IEEE
This paper gives an overview of various collector topologies for offshore wind farms. A comparative analysis of different DC and AC collector system topologies for offshore wind power plant are presented. The advantages and disadvantages of collector system topologies in terms of cost, reliability and efficiency are discussed. The paper discusses various updated collector topologies like radial, single sided ring, double sided ring, star and hybrid AC-DC etc. in AC collector systems and series, parallel, hybrid and matrix interconnected topology etc in DC collector systems. At the end alternative topologies based on bypassing method for radial, double sided topology are explained.