scholarly journals Power Flow and Transient Stability Enhancement using Thyristor Controlled Series Compensation

2018 ◽  
Vol 37 (4) ◽  
pp. 685-700 ◽  
Author(s):  
Zaira Anwar ◽  
Tahir Nadeem Malik ◽  
Tahir Abbas
Keyword(s):  
Power System ◽  
Transmission Line ◽  
Dynamic Stability ◽  
Power Flow ◽  
Transient Stability ◽  
Dynamic Models ◽  
Efficient Solutions ◽  
Simulation Software ◽  
Series Compensation ◽  
Thyristor Controlled Series Compensation

TL (Transmission Line) congestion is a key factor that affects the power system operational cost. In addition of renewable generation in National Grid of Pakistan, transmission line congestion are frequent. Consequently, the network in this particular region faces severe congestion and dynamic stability problems. It has been planned that renewable plants shaved to curtail some available generation to minimize this inevitable congestion. However, one of the cost-efficient solutions to this problem is series compensation of lines using TCSC (Thyristor Controlled Series Compensation). It significantly increases the transfer capability of existing power transmission and enhances the dynamic stability of system at a lower cost, and has shorter installation time as compared to the construction of new TLs. This paper deals with the dynamic modeling of a TCSC in the NTDC (National Transmission and Dispatch Company) network with its applications to alleviate congestion during fault conditions. This study has been carried out using simulation software PSS/E (Power System Simulator for Engineers) which does not have a predefined dynamic model for TCSC, this leads to the necessity of creating a user defined model. The model of TCSC has been programmed in FORTRAN and compiled along with existing dynamic models of network components. The results indicate that power flow and dynamic stability of network is enhanced

scholarly journals A Three-Stage Procedure for Controlled Islanding to Prevent Wide-Area Blackouts

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3066 ◽  
Author(s):  
Hongbo Shao ◽  
Yubin Mao ◽  
Yongmin Liu ◽  
Wanxun Liu ◽  
Sipei Sun ◽  
...  
Keyword(s):  
Power System ◽  
Dynamic Stability ◽  
Power Flow ◽  
Transient Stability ◽  
Load Shedding ◽  
Area Measurement ◽  
Wide Area ◽  
Measurement Systems ◽  
Controlled Islanding ◽  
Three Stages

Controlled islanding has been proposed as a last resort action to stop blackouts from happening when all standard methods have failed. Successful controlled islanding has to deal with three important issues: when, and where to island, and the evaluation of the dynamic stability in each island after islanding. This paper provides a framework for preventing wide-area blackouts using wide area measurement systems (WAMS), which consists of three stages to execute a successful islanding strategy. Normally, power system collapses and blackouts occur shortly after a cascading outage stage. Using such circumstances, an adapted single machine equivalent (SIME) method was used online to determine transient stability before blackout was imminent, and was then employed to determine when to island based on transient instability. In addition, SIME was adopted to assess the dynamic stability in each island after islanding, and to confirm that the chosen candidate island cutsets were stable before controlled islanding was undertaken. To decide where to island, all possible islanding cutsets were provided using the power flow (PF) tracing method. SIME helped to find the best candidate islanding cutset with the minimal PF imbalance, which is also a transiently stable islanding strategy. In case no possible island cutset existed, corresponding corrective actions such as load shedding and critical generator tripping, were performed in each formed island. Finally, an IEEE 39-bus power system with 10 units was employed to test this framework for a three-stage controlled islanding strategy to prevent imminent blackouts.

Simulation of Power Plant Subsynchronous Resonance Possibility Based on ADPSS

2013 ◽  
Vol 444-445 ◽  
pp. 932-940
Author(s):  
Xiao Meng Li ◽  
Hua Wang ◽  
Zhen An Zhang ◽  
Min Liu ◽  
De Chao Xu
Keyword(s):  
Power Plant ◽  
Power System ◽  
Transmission Line ◽  
Power Grid ◽  
Torsional Oscillation ◽  
High Capacity ◽  
Simulation Software ◽  
Long Distance ◽  
Series Compensation ◽  
Subsynchronous Resonance

The rotor shaft of a steam turbine generator consists of several masses, such as rotors of turbine sections, generator section and exciter section. When the generator is perturbed, it will cause torsional oscillation between different sections. In long-distance high-capacity transmission lines, series compensation with capacitors can enhance power transfer capability of power system, however it may cause subsynchronous resonance (SSR) between the turbine shaft and serial compensation., which produce large shaft torques can result in a reduction in the shaft fatigue life and possibly shaft failure, threatening the security of generator unit and stability of power system. In China the 1000kV HVAC transmission line with series compensation has been put in operation since 2009. Near the Nanyang substation, there has a power plant in Henan power grid. So it is necessary to model the power plant and HVAC transmission line to simulate the possibility of SSR problem. Based on the power system simulation software ADPSS developed by China Electric Power Research Institute (CEPRI), this paper built up the simulation model using the electromechanical-electromagnetic transient hybrid method, and simulated the SSR possibility between the power plant and HVAC transmission line series compensation. The simulation results showed that with the generator parameters given, there has no risk of SSR between them. This paper also gives an evaluation principle of generator SSR risk when connected into a power grid.

scholarly journals A new algorithm to enhance power transfer using series capacitor

2006 ◽  
Vol 24 (1) ◽  
pp. 55
Author(s):  
H D Mathur ◽  
C M Arora ◽  
R C Bansal
Keyword(s):  
Power System ◽  
Transmission Line ◽  
Transient Stability ◽  
Compensation Method ◽  
Power Transfer ◽  
Power Capacity ◽  
Series Compensation ◽  
Series Capacitor

The compensation of transmission line reactance by means of series compensation is an effective method increasing the power transfer capacity and thereby improving the transient stability of the power system. This paper presents a novel series compensation method to increase the power capacity of the system. The proposed method is applied to a 9-bus power system.

scholarly journals Impact of hybrid FACTS devices on the stability of the Kenyan power system

2022 ◽  
Vol 12 (1) ◽  
pp. 12
Author(s):  
Mutegi Mbae ◽  
Nnamdi Nwulu
Keyword(s):  
Power System ◽  
Transmission Line ◽  
Power Flow ◽  
Transient Stability ◽  
System Analysis ◽  
Normal Operation ◽  
Unified Power Flow Controller ◽  
Static Synchronous Compensator ◽  
Facts Devices ◽  
Rotor Angle

<p>Flexible alternating current transmission system (FACTS) devices are deployed for improving power system’s stability either singly or as a combination. This research investigates hybrid FACTS devices and studies their impact on voltage, small-signal and transient stability simultaneously under various system disturbances. The simulations were done using five FACTS devices-static var compensator (SVC), static synchronous compensator (STATCOM), static synchronous series compensators (SSSC), thyristor controlled series compensator (TCSC) and unified power flow controller (UPFC) in MATLAB’s power system analysis toolbox (PSAT). These five devices were grouped into ten pairs and tested on Kenya’s transmission network under specific contingencies: the loss of a major generating machine and/or transmission line. The UPFC-STATCOM pair performed the best in all the three aspects under study. The settling times were 3 seconds and 3.05 seconds respectively for voltage and rotor angle improvement on the loss of a major generator at normal operation. The same pair gave settling times of 2.11 seconds and 3.12 seconds for voltage and rotor angle stability improvement respectively on the loss of a major transmission line at 140% system loading. From the study, two novel techniques were developed: A performance-based ranking system and classification for FACTS devices.</p>

scholarly journals TEACHING UNDERGRADUATE POWER SYSTEM COURSES WITH THE USE OF SIEMENS PTI PSS/E-UNIVERSITY SIMULATION SOFTWARE

2013 ◽  
Author(s):  
Chi Tang ◽  
Adam Freeman ◽  
Jerome Spence ◽  
Matthew Bradica ◽  
Donge Ren
Keyword(s):  
Power System ◽  
Power Flow ◽  
Transient Stability ◽  
Reactive Power ◽  
Short Circuit ◽  
Flow Analysis ◽  
Theoretical Background ◽  
Simulation Software ◽  
Engineering Technology ◽  
Basic Power

This paper summarizes the experience in using Siemens PSSE-University power system simulation software as a teaching aid to introduce basic power system concepts to engineering technology students at the undergraduate level. Topics to be discussed and demonstrated in this paper include AC and DC power flow analysis, power system transient stability analysis, reactive power and voltage control, as well as short circuit analysis. For each of the topics presented above, the paper will provide (i) the theoretical background, (ii) a numerical example solvable by hand-calculations, and (iii) the corresponding solution obtained from running PSSE- University. The paper will also provide the perspectives of the instructor on using PSSE as a teaching tool and the perspectives of the students on using PSSE as a learning tool.

Study on Improving Power System Damping by Using DPFC

2014 ◽  
Vol 986-987 ◽  
pp. 1286-1290
Author(s):  
Jin Li ◽  
Ya Min Pi ◽  
Hui Yuan Yang
Keyword(s):  
Power System ◽  
Power Flow ◽  
Transient Stability ◽  
Stability Control ◽  
System Stability ◽  
Single Machine Infinite Bus ◽  
Formula Derivation ◽  
Object Of Study ◽  
Power System Oscillations ◽  
Distributed Power Flow

In this paper, the series converters of Distributed Power Flow Controller are the main object of study. Its mechanism of suppressing power system oscillations is studied by theoretical analysis and formula derivation, which relies on a single-machine infinite-bus power system, installed the series converters. Then based on the mechanism, adopting the classic PI control and the damping controller, designed the transient stability control loop for the series converters. Finally, simulations performed by PSCAD/EMTDC, the results show that DPFC device can effectively suppress oscillation and improve system stability.

Performance Analysis on Transmission Line for Improvement of Load Flow

2012 ◽  
Vol 433-440 ◽  
pp. 7208-7212
Author(s):  
Ya Min Su Hlaing ◽  
Ze Ya Aung
Keyword(s):  
Steady State ◽  
Power System ◽  
Transmission Line ◽  
Power Flow ◽  
Reactive Power ◽  
Load Flow ◽  
Electric Power System ◽  
Steady State Condition ◽  
Newton Raphson ◽  
Raphson Method

This thesis implements power flow application, Newton-Raphson method. The Newton-Raphson method is mainly employed in the solution of power flow problems. The network of Myanma electric power system is used as the reference case. The system network contains 90 buses and 106 brunches. The weak points are found in the network by using Newton-Raphson method. Bus 16, 17, 85 and 86 have the most weak bus voltages. The medium transmission line between bus 87 and bus 17 is compensated by using MATLAB program software. The transmission line is compensated with shunt reactors, series and shunt capacitors to improve transient and steady-state stability, more economical loading, and minimum voltage dip on load buses and to supply the requisite reactive power to maintain the receiving end voltage at a satisfactory level. The system performance is tested under steady-state condition. This paper investigates and improves the steady–state operation of Myanma Power System Network.

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