scholarly journals Hopf Bifurcation Control of Subsynchronous Resonance Utilizing UPFC

2017 ◽  
Vol 7 (3) ◽  
pp. 1588-1594
Author(s):  
Μ. Μ. Alomari ◽  
M. S. Widyan ◽  
M. Abdul-Niby ◽  
A. Gheitasi
Keyword(s):  
Power System ◽  
Transmission Line ◽  
Power Flow ◽  
Operating Point ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Unified Power Flow Controller ◽  
Subsynchronous Resonance ◽  
Wide Range ◽  
System Stabilizer

The use of a unified power flow controller (UPFC) to control the bifurcations of a subsynchronous resonance (SSR) in a multi-machine power system is introduced in this study. UPFC is one of the flexible AC transmission systems (FACTS) where a voltage source converter (VSC) is used based on gate-turn-off (GTO) thyristor valve technology. Furthermore, UPFC can be used as a stabilizer by means of a power system stabilizer (PSS). The considered system is a modified version of the second system of the IEEE second benchmark model of subsynchronous resonance where the UPFC is added to its transmission line. The dynamic effects of the machine components on SSR are considered. Time domain simulations based on the complete nonlinear dynamical mathematical model are used for numerical simulations. The results in case of including UPFC are compared to the case where the transmission line is conventionally compensated (without UPFC) where two Hopf bifurcations are predicted with unstable operating point at wide range of compensation levels. For UPFC systems, it is worth to mention that the operating point of the system never loses stability at all realistic compensation degrees and therefore all power system bifurcations have been eliminated.

scholarly journals Dynamic analysis of voltage angle droop controlled HVDC systems in curative congestion management scenarios

2019 ◽  
Vol 217 ◽  
pp. 01004
Author(s):  
Yang Zhou ◽  
Stefan Dalhues ◽  
Ulf Häger
Keyword(s):  
Power System ◽  
Dynamic Behavior ◽  
Transmission Lines ◽  
Power Flow ◽  
Congestion Management ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Management Scenarios ◽  
Hvdc System ◽  
Good Ability

The integration of the voltage-source converter based high voltage direct current (VSC-HVDC) system makes the set-point of its active power adaptive to the changes in the power flow, and contributes to the curative congestion management. To further exploit the dynamic behavior of a hybrid AC/DC power system in curative congestion management scenarios, this paper investigates a novel control scheme for voltage angle droop controlled HVDC (VAD-HVDC) systems. The proposed scheme to alleviate the circuit overload is estimated firstly by calculating the severity index when the power flow changes under N-1 situations. Then the voltage angle controlled HVDC system is applied on the modified IEEE 39-bus 10-machine test power system for the time-domain simulation. The dynamic behavior in the HVDC station validates that the VAD control can stabilize the DC voltage and possess a good ability against interference. In addition, the dynamic characteristics analysis on the AC transmission lines proves that the hybrid AC/DC system integrated with the VAD controlled HVDC system are in possession of good stability after the N-1 contingency event. The VAD controller employed in the HVDC system is capable of effective congestion management to mitigate the critical loadings on the transmission lines.

Application of Unified Power Flow Controller to Improve Steady State Voltage Limit

2017 ◽  
Vol 6 (4) ◽  
pp. 277
Author(s):  
Samina. E. Mubeen ◽  
Baseem Khan ◽  
R. K. Nema
Keyword(s):  
Steady State ◽  
Power System ◽  
Power Flow ◽  
Load Flow ◽  
Electric Power System ◽  
Voltage Source ◽  
Unified Power Flow Controller ◽  
Analytical Methodology ◽  
Flow Controller ◽  
Power Flow Controller

<span>This paper utilizes the voltage source model of Unified Power Flow Controller (UPFC) and examines its abilities in mitigating the steady state stability margins of electric power system. It analyzes its behavior for different controls strategies and proposes the most efficient mode of controlling the controller for voltage stability enhancement. A systematic analytical methodology based on the concept of modal analysis of the modified load flow equations is employed to identify the area in a power system which is most prone voltage instability. Also to identify the most effective point of placement for the UPFC, a computer program has been developed using MATLAB. The results of analysis on 14 bus system is presented here as a case study.</span>

scholarly journals Subsynchronous resonance and its mitigation for power system with unified power flow controller

2017 ◽  
Vol 6 (1) ◽  
pp. 181-189 ◽  
Author(s):  
Xinyao ZHU ◽  
Meng JIN ◽  
Xiangping KONG ◽  
Jingbo ZHAO ◽  
Jiankun LIU ◽  
...  
Keyword(s):  
Power System ◽  
Power Flow ◽  
Unified Power Flow Controller ◽  
Subsynchronous Resonance ◽  
Flow Controller ◽  
Power Flow Controller

scholarly journals Optimal Coordinated Design of Multiple Damping Controllers Based on PSS and UPFC Device to Improve Dynamic Stability in the Power System

2013 ◽  
Vol 2013 ◽  
pp. 1-15 ◽  
Author(s):  
A. N. Hussain ◽  
F. Malek ◽  
M. A. Rashid ◽  
L. Mohamed ◽  
N. A. Mohd Affendi
Keyword(s):  
Power System ◽  
Transmission Lines ◽  
Power Flow ◽  
Unified Power Flow Controller ◽  
Damping Controllers ◽  
Power Oscillation Damping ◽  
Single Machine Infinite Bus ◽  
System Stabilizer ◽  
Chaotic Particle Swarm Optimization ◽  
The Individual

Unified Power Flow Controller (UPFC) device is applied to control power flow in transmission lines. Supplementary damping controller can be installed on any control channel of the UPFC inputs to implement the task of Power Oscillation Damping (POD) controller. In this paper, we have presented the simultaneous coordinated design of the multiple damping controllers between Power System Stabilizer (PSS) and UPFC-based POD or between different multiple UPFC-based POD controllers without PSS in a single-machine infinite-bus power system in order to identify the design that provided the most effective damping performance. The parameters of the damping controllers are optimized utilizing a Chaotic Particle Swarm Optimization (CPSO) algorithm based on eigenvalue objective function. The simulation results show that the coordinated design of the multiple damping controllers has high ability in damping oscillations compared to the individual damping controllers. Furthermore, the coordinated design of UPFC-based POD controllers demonstrates the superiority over the coordinated design of PSS and UPFC-based POD controllers for enhancing greatly the stability of the power system.

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