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Manohar, Premila
- Performance Evaluation of VSC-HVDC Link for Varying AC System Strengths
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Authors
Affiliations
1 Power Systems Division, Central Power Research Institute, Bengaluru – 560080, Karnataka, IN
2 Department of Electrical and Electrinics Engineering, Ramaiah Institute of Technology, Bengaluru – 560054, Karnataka, IN
3 Department of Electrical and Electronics Engineering, Acharya Institute of Technology, Bengaluru – 560107, Karnataka, IN
1 Power Systems Division, Central Power Research Institute, Bengaluru – 560080, Karnataka, IN
2 Department of Electrical and Electrinics Engineering, Ramaiah Institute of Technology, Bengaluru – 560054, Karnataka, IN
3 Department of Electrical and Electronics Engineering, Acharya Institute of Technology, Bengaluru – 560107, Karnataka, IN
Source
Power Research, Vol 14, No 1 (2018), Pagination: 105-113Abstract
Strength of the AC system is one of the important parameters that govern performance of HVDC systems. Even though VSC-HVDC is known to have fewer problems compared to LCC-HVDC at lower system strengths, it is still the topic of research. This paper presents a detailed analysis on the modelling and tuning of the control system of a VSC-HVDC system for varied AC system strengths. Emphasis has been on the tuning of control system parameters considering the effect of AC system strength to improve the transient response of the VSC-HVDC system. A combination of control schemes consisting of DC voltage and AC voltage control at the rectifier and inverter end have been considered. The control parameters are tuned with symmetrical and modulus optimum criteria and found that tuning method is working for weak systems. The VSC-HVDC system is modelled in RSCAD software of RTDS.Keywords
AC Voltage Control, Active and Reactive Power Control, DC Voltage Control, Proportional Integral (PI), Short Circuit Ratio (SCR) Words, Source Impedance, VSC - HVDC
- Application of Superconducting Fault Current Limiter and Chopper Controlled Resistor for Protection of VSC-HVDC System
Abstract Views :253 |
PDF Views:0
Authors
Affiliations
1 Department of Electrical and Electronics Engineering, Government Polytechnic, Immadihalli, Whitefield, Bangalore – 560066, Karnataka, IN
2 Department of Electrical and Electronics Engineering, M. S. Ramaiah Institute of Technology, Bangalore – 560054, Karnataka, IN
1 Department of Electrical and Electronics Engineering, Government Polytechnic, Immadihalli, Whitefield, Bangalore – 560066, Karnataka, IN
2 Department of Electrical and Electronics Engineering, M. S. Ramaiah Institute of Technology, Bangalore – 560054, Karnataka, IN
Source
Power Research, Vol 15, No 1 (2019), Pagination: 25-38Abstract
The Voltage Source Converter based HVDC (VSC-HVDC) transmission system involving overhead lines lack the inherent ability to overcome severe over currents and over voltages during dc line fault conditions. Presently, the fast acting commercial HVDC circuit breakers are uneconomical and are in prototype status. Due to this, the VSC-HVDC system finds applications in back to back and underground cable transmissions where the occurrence of dc faults is almost zero. In this context, the present paper analyses the combined application of Superconducting Fault Current Limiter (SCFCL) along with Chopper Controlled Resistors (CCR) to overcome and recover from the effects of dc line faults. The resistive SCFCL is modeled in MATLAB and the VSC-HVDC system is analyzed using PSCAD/EMTDC environment. The simulation results show that during dc line faults, the SCFCL is effective in limiting the over currents and the CCR overcomes the over voltages. The combined simulated protection strategy restores the complete VSC-HVDC system without restarting of the dc link.Keywords
Voltage Source Converter based HVDC (VSC-HVDC), Superconducting Fault Current Limiter (SCFCL), Chopper Controlled Resistors (CCR).References
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