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Sreedevi, J.
- Network reduction of power system for transient stability studies
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Affiliations
1 Senior Research Fellow Power Systems Division Central Power research Institute Bengaluru, IN
2 Joint Director Power Systems Division Central Power Research Institute Bengaluru, IN
3 Professor Dept. of Electrical and Electronics Engineering M S Ramaiah Institute of Technology Bengaluru, IN
1 Senior Research Fellow Power Systems Division Central Power research Institute Bengaluru, IN
2 Joint Director Power Systems Division Central Power Research Institute Bengaluru, IN
3 Professor Dept. of Electrical and Electronics Engineering M S Ramaiah Institute of Technology Bengaluru, IN
Source
Power Research, Vol 13, No 2 (2017), Pagination: 263-268Abstract
Modern power systems are complicated and heavily interconnected systems. Hence critical analysis of the network for power system planning is very important. Challenges in analyzing large interconnected networks have given rise to the need to find small, equivalent networks in order to improve computational efficiency. There are many methods for determining an equivalent network which accurately represents the original network. In this paper Thevenin’s method is used to calculate the equivalent of a system. The PSS/E software is used to demonstrate the method for separation of a particular area network from all-India network by placing dynamic equivalents at the boundary buses.Keywords
boundary buses, dynamic equivalent, internal and external systems, transient stability
- Need for Real Time Simulation in cyber security Applications
Abstract Views :184 |
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Authors
Affiliations
1 Joint Director, PSD, Central Power Research Institute, Bengaluru, Karnataka, 560080, IN
2 Senior Research Fellow, PSD, Central Power Research Institute, Bengaluru, Karnataka, 560080, IN
3 Additional Director, PSD, Central Power Research Institute, Bengaluru, Karnataka, 560080, IN
1 Joint Director, PSD, Central Power Research Institute, Bengaluru, Karnataka, 560080, IN
2 Senior Research Fellow, PSD, Central Power Research Institute, Bengaluru, Karnataka, 560080, IN
3 Additional Director, PSD, Central Power Research Institute, Bengaluru, Karnataka, 560080, IN
Source
Power Research, Vol 12, No 4 (2016), Pagination: 731-736Abstract
Various sophisticated technologies have been deployed in the modern power system to facilitate the notion of smart grid, integrating the power system, associated IT infrastructure and the communication network into a Cyber-Physical System (CPS). The increasing coupling between a physical power system and its communication network necessitates a Cyber-Physical test environment to investigate and guarantee the grid’s stability and reliability. A Cyber-Physical Testbed consists of four components – a Physical power systems layer, a power systems monitoring layer, a Communication Network layer and an Energy Management Systems layer. In this paper, the need of a Cyber Security testbed is detailed along with an architecture of a typical Cyber Security Testbed and the role of a Real Time Simulator in the Testbed.Keywords
Cyber-Physical System (CPS), Cyber-Physical Testbed, Phasor Measurement Units (PMU), Real Time Digital Simulator- DC fault analysis in voltage source converter based HVDC link
Abstract Views :179 |
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Authors
Affiliations
1 Koneru Lakshmaiah University, Vaddeswaram, Guntur -522502, Andhra Pradesh, IN
2 Central Power Research Institute, Bangalore - 560 080, Karnataka, IN
1 Koneru Lakshmaiah University, Vaddeswaram, Guntur -522502, Andhra Pradesh, IN
2 Central Power Research Institute, Bangalore - 560 080, Karnataka, IN
Source
Power Research, Vol 11, No 2 (2015), Pagination: 269-276Abstract
The use of voltage source converter (VSC) based HVDC transmission for the interconnection of various power networks is increasing day by day. However, VSCs susceptibility to DC faults, particularly the potential damage caused to the converter switches due to overcurrent, is an issue. The fault clearing must be done very rapidly, to limit the effect of the fault on neighboring networks. This paper analyses the two terminal behavior of a VSC- based HVDC system under DC fault condition. In this work, HVDC link is connected between the systems of two different frequencies. Simulations are carried out in RSCAD/RTDSTM software and the performance of the system is analyzed for DC faults and the results are presented.Keywords
Voltage source converter, VSC-HVDC, DC fault, DC voltage controller, AC voltage controller, (Neutral Point diode Clamped) NPC converter.- Performance Evaluation of VSC-HVDC Link for Varying AC System Strengths
Abstract Views :190 |
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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- Computation of Lightning Overvoltage in 220 kV Substation due to Direct Stroke on Overhead Transmission Line
Abstract Views :81 |
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Authors
Affiliations
1 Power Systems Division, Central Power Research Institute, Bengaluru – 560012, Karnataka, IN
1 Power Systems Division, Central Power Research Institute, Bengaluru – 560012, Karnataka, IN
Source
Power Research, Vol 17, No 1 (2021), Pagination: 53-58Abstract
This paper deals with the computation of overvoltage in a 220 kV line as well as at important locations of the associated substation caused by the lightning, especially, in the event of direct stoke to the line’s phase conductor. Comparison of the voltages at various locations of the substation with and without the presence of the lightning protecting system is also carried out. The computations have been carried out using the Electromagnetic Transient Program. Simulation results for the case of without the presence of lightning arrester anywhere in the system showed the obvious very high lightning over voltages at all locations of the system. The results of the case study with the presence of 216 kV lightning arrester only at line terminal (at substation entry) showed that over voltages occurring across all the substation equipment are within the accepted protection margin of 25% with reference to their BILs. However, inadequacy of this protection margin for transformers, prompted use of lightning arresters at its HV terminals also. Computation results of this case study showed the new protection margin 37% for the transformer which is more than the requirement of 30%. It is inferred that lightning arrester on HV side of the transformer is a must for avoiding failure of insulation of transformer due to lightning striking the connected transmission line. The full paper describes the system considered, its modelling in EMTP, study methodology, results of case studies and inferences drawn.Keywords
BIL, Lightning Arrester, Lightning Overvoltages, Protection Margin, Shielding Failure, SubstationReferences
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- International Electro Technical Commission, IEC 60071-4. Insulation co-ordination - Part 4: Computational guide to insulation co-ordination and modelling of electrical networks; 2006.
- Marti J R. Accurate modelling of frequency-dependent transmission lines in electromagnetic transient simulations. IEEE Transactions on Power Apparatus and Systems. 1982; PAS-101(1). https://doi.org/10.1109/TPAS.1982.317332
- EPRI. AC transmission line reference book-200kV and above. Third Edition, Electric Power Research Institute; 2005.
- Vasileva M. Lightning overvoltage in electrical substation 220 kV due to shielding failure of overhead transmission line.
- Multi-Functional UPS for Commercial Use
Abstract Views :73 |
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Authors
Affiliations
1 Power Systems Division, Central Power Research Institute, Bengaluru – 560080, Karnataka, IN
1 Power Systems Division, Central Power Research Institute, Bengaluru – 560080, Karnataka, IN
Source
Power Research, Vol 17, No 1 (2021), Pagination: 45-52Abstract
This paper proposes a line-interactive static UPS system with a simple control strategy for the operation of three-leg IGBT based AC/DC converter. Min-Max algorithm based PWM technique is used as switching logic for AC/DC converter. The developed control strategy addresses the applications like reactive power compensation of load, unbalanced currents compensation, active power compensation during peak load time on the grid and Seamless power transfer operation from grid-connected mode to islanding mode. LCL filter is designed to meet the THD limits specified in IEEE Std 519-2014.Keywords
Grid-connected Mode, Islanding Mode, Line-interactive Static UPS, Min-Max Algorithm, Seamless Power Transfer, THD .References
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- Voltage Stability Analysis of IEEE118 Bus System with Wind Penetration
Abstract Views :75 |
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Authors
Affiliations
1 Power System Division, Central Power Research Institute, Bengaluru – 560012, Karnataka, IN
1 Power System Division, Central Power Research Institute, Bengaluru – 560012, Karnataka, IN
Source
Power Research, Vol 17, No 1 (2021), Pagination: 17-21Abstract
The increased penetration of renewable energy sources affects the voltage stability of the system. This article provides steady state voltage stability analysis with wind penetration. The standard IEEE 118 bus system is used for the analysis. The system is modelled in PSSE software and NR-Power flow method is used to perform the power flow studies with various levels of wind penetration. From the load flow studies voltage profile at load buses is analysed through PV curves. System is further studied with reactive power compensation provided at wind generator terminals. All cases are analysed for voltage stability with respect to increase in loading of the system.Keywords
IEEE 118 System, Shunt Compensation, Voltage Stability, Wind Penetration.References
- Ren21.net, Renewables 2018, Global status report, Renewable Energy Policy Network for the 21st Century (REN 21) [Internet]. [cited 2018 Aug 18]. Available from: http://www.ren21.net/wp-content/uploads/2018/06/17-8652_ GSR2018_FullReport_web_-1.pdf.
- Ahmed SD, Al-Ismail FSM, Shafiullah M, Al-Sulaiman FA, El-Amin IM. Grid integration challenges of wind energy: A review. IEEE. 2020; 8:10857–78. https://doi.org/10.1109/ACCESS.2020.2964896
- Ebadian M, Edrisian A, Goudarzi A. Investigating the effect of high level of wind penetration on voltage stability by quasi-static time-domain simulation. International Journal of Renewable Energy Research. 2014; 4(2).
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- Martinez-Anido PCB, Hodge B. An Extended IEEE 118Bus Test System With High Renewable Penetration. IEEE Transactions on Power Systems. 2018; 33(1):281–9. https://doi.org/10.1109/TPWRS.2017.2695963
- Stability Analysis of Microgrid with Load Shedding Scheme using RTDS
Abstract Views :124 |
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Authors
Affiliations
1 Power Systems Division, Central Power Research Institute, Bengaluru – 560080, Karnataka, IN
1 Power Systems Division, Central Power Research Institute, Bengaluru – 560080, Karnataka, IN
Source
Power Research, Vol 18, No 2 (2022), Pagination: 157-163Abstract
A microgrid system was simulated using the powerful RTDS simulator, the modelling was done on the RSCAD software, and the microgrid comprised of a diesel generator, a photovoltaic (PV) system and a Doubly-Fed Induction Generator (DFIG) wind turbine system as DERs. The paper comprises the study on stability analysis of the microgrid in grid-connected and islanded modes of operation, along with a successful load shedding scheme which was implemented based on the loads distinguished as low priority and high priority loads in order to keep the system balanced during faults.Keywords
Average Value Model (AVM), Distributed Energy Source (DER), Load Shedding, Microgrids (MG), Rate of Change of Frequency (ROCOF), Real-Time Simulation, Renewable Energy Resources (RES)References
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