Conference Papers
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506
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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 Transient Analysis of LCC based HVDC Offshore Wind Farms using DIgSILENT PowerFactory(Institute of Electrical and Electronics Engineers Inc., 2021) Hiremath, R.; Moger, T.Offshore wind farms (OWFs) connect to onshore grids through HVDC cable. Severe grid faults mainly affect the offshore wind farms and HVDC cables. As a result, the transient response of the system deteriorates. Therefore, this paper aims for the transient analysis of line commutated current converter (LCC) based HVDC system under 3-phase fault. The paper proposes the DIgSILENT Simulation Language (DSL) oriented PI control for the both rectifier and inverter stations. The whole HVDC system is modelled in DIgSILENT PowerFactory software for the better transient response. In addition, the PI control and voltage dependent current order limiter (VDCOL) are designed in this PowerFactory software. The advantage of this software is that it improves the transient behaviour and stability of the system. These controllers limit the inrush current and voltage fluctuations at the moment of fault occurrence and clearance. The simulation results under fault indicate the better transient response with the system stability. © 2021 IEEE.Item Direct current analysis of lcc based HVDC system during fault using DIgSILENT PowerFactory(Institute of Electrical and Electronics Engineers Inc., 2021) Hiremath, R.; Moger, T.The performance of the grid connected wind farms (WFs) with HVDC system is attracting much interest. Many WFs employ controllers for converter stations to provide a favourable grid support during fault. This paper focusses on the direct current analysis of the HVDC system during three phase (φ) fault. The paper has been proposed the "DIgSILENT Simulation Language (DSL)"based voltage dependant current order limiter (VDCOL) and PI controller for the converter stations. The DIgSILENT PowerFactory (DPF) software provides the platform to model the HVDC system for better DC current and voltage response under the fault. The stability of this system is analysed with the bode plot. The simulation results under the 3-phase fault indicate the better DC current and voltage behaviour. © 2021 IEEE.