Comparison of Application of SVC and STATCOM on Suppressing Subsynchronous Oscillation

2014 ◽  
Vol 1070-1072 ◽  
pp. 1144-1149 ◽  
Author(s):  
Qin Lei Chen ◽  
Chun Lin Guo
Keyword(s):  
Simulation Model ◽  
Time Domain ◽  
Reactive Power ◽  
Control Strategies ◽  
Basic Function ◽  
Time Domain Simulation ◽  
Dynamic Compensation ◽  
Benchmark Model ◽  
Subsynchronous Oscillation ◽  
Facts Devices

As the main types of parallel FACTS devices, the basic function of SVC and STATCOM is to realize the dynamic compensation of reactive power and maintain system voltage stability. However, when new control strategies are added to them .Both of them can suppress SSO effectively. Based on IEEE first benchmark model, this paper established simulation model by PSCAD/EMTDC. The effects of suppressing SSO by SVC/STATCOM are verified with time domain simulation, and the comparative analyses are carried out on the effects of suppressing SSO by SVC and STATCOM.

Study of HVDC System and Subsynchronous Oscillation

2015 ◽  
Vol 1092-1093 ◽  
pp. 356-361
Author(s):  
Peng Fei Zhang ◽  
Lian Guang Liu
Keyword(s):  
Power Plant ◽  
Time Domain ◽  
Simulation Method ◽  
Time Domain Simulation ◽  
Stable Convergence ◽  
Turbine Generator ◽  
Plant Model ◽  
Subsynchronous Oscillation ◽  
Hvdc System ◽  
Simulation Results

With the application and development of Power Electronics, HVDC is applied more widely China. However, HVDC system has the possibilities to cause subsynchronous torsional vibration interaction with turbine generator shaft mechanical system. This paper simply introduces the mechanism, analytical methods and suppression measures of subsynchronous oscillation. Then it establishes a power plant model in islanding model using PSCAD, and analyzes the effects of the number and output of generators to SSO, and verifies the effect of SEDC and SSDC using time-domain simulation method. Simulation results show that the more number and output of generators is detrimental to the stable convergence of subsynchronous oscillation, and SEDC、SSDC can restrain unstable SSO, avoid divergence of SSO, ensure the generators and system operate safely and stably

0605 Time domain simulation model for active fixturing in milling

2015 ◽  
Vol 2015.8 (0) ◽  
pp. _0605-1_-_0605-6_ ◽  
Author(s):  
Antonio SCIPPA ◽  
Filippo MONTEVECCHI ◽  
Niccolo GROSSI ◽  
Lorenzo SALLESE ◽  
Gianni CAMPATELLI
Keyword(s):  
Simulation Model ◽  
Time Domain ◽  
Time Domain Simulation

Design of HVDC Supplementary Subsynchronous Damping Controller

2014 ◽  
Vol 960-961 ◽  
pp. 1017-1021
Author(s):  
Qin Lei Chen ◽  
Chun Lin Guo ◽  
Han Chen ◽  
Jun Chen ◽  
Ya Nan Li ◽  
...  
Keyword(s):  
Power Plant ◽  
Time Domain ◽  
Control Strategies ◽  
Design Methods ◽  
Electromagnetic Simulation ◽  
Subsynchronous Oscillation ◽  
Time Domain Electromagnetic ◽  
Simulation Results ◽  
Damping Controller

Supplementary subsynchronous damping controller (SSDC) is an effective countermeasure to damp the subsynchronous oscillation (SSO) caused by HVDC. On the basis of analyzing the mechanism of inducing SSO by HVDC, the principle of damping SSO by SSDC and SSDC design methods are expounded. A SSDC is designed for a practical power plant in China, and the correctness and validity of the SSDC control strategies are proved with time domain electromagnetic simulation results.

Time Domain Simulation Model for Research Vessel Gunnerus

2015 ◽  
Author(s):  
Vahid Hassani ◽  
Andrew Ross ◽  
Ørjan Selvik ◽  
Dariusz Fathi ◽  
Florian Sprenger ◽  
...  
Keyword(s):  
Simulation Model ◽  
Time Domain ◽  
Trial Data ◽  
Full Scale ◽  
Dynamic Equations ◽  
Scale Model ◽  
Research Vessel ◽  
Oil Exploration ◽  
Time Domain Simulation ◽  
Sea Trial

A research vessel (RV) plays an important role in many fields such as oceanography, fisheries and polar research, hydrographic surveys, and oil exploration. It also has a unique function in maritime research and developments. Full-scale sea trials that require vessels, are usually extremely expensive; however, research vessels are more available than other types of ship. This paper presents the results of a time-domain simulation model of R/V Gunnerus, the research vessel of the Norwegian University of Science and Technology (NTNU), using MARINTEK’s vessel simulator (VeSim). VeSim is a time-domain simulator which solves dynamic equations of vessel motions and takes care of seakeeping and manoeuvring problems simultaneously. In addition to a set of captive and PMM tests on a scale model of Gunnerus, full-scale sea trials are carried out in both calm and harsh weather and the proposed simulation model is validated against sea trial data.

Design of Over Center Valves Based on Predictable Performance

2004 ◽  
Author(s):  
Michael R. Hansen ◽  
Torben Ole Andersen ◽  
Peder Pedersen ◽  
Finn Conrad
Keyword(s):  
Simulation Model ◽  
Time Domain ◽  
Oscillatory Behavior ◽  
Parameter Study ◽  
Time Domain Simulation ◽  
Valve System ◽  
Instability Problem ◽  
Application Specific ◽  
Force Compensation

A typical over center valve system and a time domain simulation model is introduced together with a hypothesis that flow force compensation should reduce the inherent oscillatory behavior of such systems. A few results are shown from a parameter study that confirms this assumption and an approach to design over center valve geometries that have negative flow forces is presented with emphasis on predictability. In conclusion it is made clear that negative flow forces in the over center valve cannot solve the instability problem in general, however, it might very well be a method like lowering the pilot ratio, that can be used to application specific instability problems.

scholarly journals Convolution-based time-domain simulation for fluidelastic instability in tube arrays

2021 ◽  
Author(s):  
Mingjie Zhang ◽  
Ole Øiseth
Keyword(s):  
Impulse Response ◽  
Response Function ◽  
Time Domain ◽  
Impulse Response Function ◽  
Time Domain Simulation ◽  
Unit Step ◽  
Tube Arrays ◽  
Unit Impulse ◽  
The Time Domain ◽  
Unit Impulse Response

AbstractA convolution-based numerical algorithm is presented for the time-domain analysis of fluidelastic instability in tube arrays, emphasizing in detail some key numerical issues involved in the time-domain simulation. The unit-step and unit-impulse response functions, as two elementary building blocks for the time-domain analysis, are interpreted systematically. An amplitude-dependent unit-step or unit-impulse response function is introduced to capture the main features of the nonlinear fluidelastic (FE) forces. Connections of these elementary functions with conventional frequency-domain unsteady FE force coefficients are discussed to facilitate the identification of model parameters. Due to the lack of a reliable method to directly identify the unit-step or unit-impulse response function, the response function is indirectly identified based on the unsteady FE force coefficients. However, the transient feature captured by the indirectly identified response function may not be consistent with the physical fluid-memory effects. A recursive function is derived for FE force simulation to reduce the computational cost of the convolution operation. Numerical examples of two tube arrays, containing both a single flexible tube and multiple flexible tubes, are provided to validate the fidelity of the time-domain simulation. It is proven that the present time-domain simulation can achieve the same level of accuracy as the frequency-domain simulation based on the unsteady FE force coefficients. The convolution-based time-domain simulation can be used to more accurately evaluate the integrity of tube arrays by considering various nonlinear effects and non-uniform flow conditions. However, the indirectly identified unit-step or unit-impulse response function may fail to capture the underlying discontinuity in the stability curve due to the prespecified expression for fluid-memory effects.

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