Browsing by Author "Srikakulapu, R."
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Item A hybrid controller design for VSC-HVDC transmission system for PMSG based offshore wind farm(IEEE Computer Society, 2017) Srikakulapu, R.; Vinatha Urundady, U.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. © 2017 IEEE.Item Combined approach based on ACO with MTSP for optimal internal electrical system design of large offshore wind farm(2018) Srikakulapu, R.; Vinatha, U.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. � 2018 IEEE.Item Combined approach based on ACO with MTSP for optimal internal electrical system design of large offshore wind farm(Institute of Electrical and Electronics Engineers Inc., 2018) Srikakulapu, R.; Vinatha Urundady, U.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. © 2018 IEEE.Item Design of a hybrid controller based on GA-SMC for the multi-terminal VSC-HVDC transmission system(2018) Srikakulapu, R.; Vinatha, U.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. � 2018 IEEE.Item Design of a hybrid controller based on GA-SMC for the multi-terminal VSC-HVDC transmission system(Institute of Electrical and Electronics Engineers Inc., 2018) Srikakulapu, R.; Vinatha Urundady, U.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. © 2018 IEEE.Item Electrical collector topologies for offshore wind power plants: A survey(2016) Srikakulapu, R.; Vinatha, U.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. � 2015 IEEE.Item Electrical collector topologies for offshore wind power plants: A survey(Institute of Electrical and Electronics Engineers Inc., 2016) Srikakulapu, R.; Vinatha Urundady, U.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. © 2015 IEEE.Item A hybrid controller design for VSC-HVDC transmission system for PMSG based offshore wind farm(2018) Srikakulapu, R.; Vinatha, U.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. � 2017 IEEE.Item Optimal design of collector topology for offshore wind farm based on ant colony optimization approach(2017) Srikakulapu, R.; Vinatha, U.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. � 2016 IEEE.Item Optimal design of collector topology for offshore wind farm based on ant colony optimization approach(Institute of Electrical and Electronics Engineers Inc., 2017) Srikakulapu, R.; Vinatha Urundady, U.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. © 2016 IEEE.Item Optimized design of collector topology for offshore wind farm based on ant colony optimization with multiple travelling salesman problem(Springer Heidelberg, 2018) Srikakulapu, R.; Vinatha Urundady, U.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. © 2018, The Author(s).Item Stability analysis and a hybrid controller design of grid-connected offshore wind farm through a VSC-HVDC transmission link(2019) Srikakulapu, R.; Vinatha, U.This paper proposes a hybrid controller which is a combination sliding mode control and PI control techniques for AC grid integrated offshore wind farm (OSWF) with voltage source converter - high voltage direct current system. The controller must be capable of controlling AC voltage, DC-link voltage, reactive power and effective power transfer. To examine the FRT capability, a symmetrical fault is applied at onshore AC grid side and compared the performances of the studied system based on the hybrid and PI controllers. The dynamic modelling and linearized system by state-space modelling for the studied system are explained in detail. The small signal stability analysis and controller stability are observed with the help of the eigenvalue analysis. The analysis of the studied system with a hybrid and conventional controllers are conducted in the software environment of the MATLAB/SIMULINK. The effect of parameter uncertainty on total system stability is examined with the help of eigenmatrix of the studied system. � 2019 Chinese Automatic Control Society and John Wiley & Sons Australia, LtdItem Stability analysis and a hybrid controller design of grid-connected offshore wind farm through a VSC-HVDC transmission link(Wiley-Blackwell info@wiley.com, 2019) Srikakulapu, R.; Vinatha Urundady, U.This paper proposes a hybrid controller which is a combination sliding mode control and PI control techniques for AC grid integrated offshore wind farm (OSWF) with voltage source converter - high voltage direct current system. The controller must be capable of controlling AC voltage, DC-link voltage, reactive power and effective power transfer. To examine the FRT capability, a symmetrical fault is applied at onshore AC grid side and compared the performances of the studied system based on the hybrid and PI controllers. The dynamic modelling and linearized system by state-space modelling for the studied system are explained in detail. The small signal stability analysis and controller stability are observed with the help of the eigenvalue analysis. The analysis of the studied system with a hybrid and conventional controllers are conducted in the software environment of the MATLAB/SIMULINK. The effect of parameter uncertainty on total system stability is examined with the help of eigenmatrix of the studied system. © 2019 Chinese Automatic Control Society and John Wiley & Sons Australia, Ltd