A Practical Approach to HVDC System Control for Damping Subsynchronous Oscillation Using the Novel Eigenvalue Analysis Program

2007 ◽  
Vol 22 (4) ◽  
pp. 1926-1934 ◽  
Author(s):  
Dong-Joon Kim ◽  
Hae-Kon Nam ◽  
Young-Hwan Moon
Keyword(s):  
Eigenvalue Analysis ◽  
Practical Approach ◽  
System Control ◽  
The Novel ◽  
Analysis Program ◽  
Subsynchronous Oscillation ◽  
Hvdc System

Research on SSO Caused by HVDC Based on Eigenvalue Analysis

2011 ◽  
Vol 383-390 ◽  
pp. 4792-4798
Author(s):  
Dan Zhang ◽  
Xiang Ning Xiao ◽  
Lin Yang ◽  
Ben Feng Gao
Keyword(s):  
Eigenvalue Analysis ◽  
Small Signal ◽  
Analysis Method ◽  
Subsynchronous Oscillation ◽  
Electromagnetic Transient ◽  
Hvdc System ◽  
Electromagnetic Transient Simulation ◽  
Linearized Model ◽  
Oscillation Characteristics ◽  
Oscillation Characteristic

Subsynchronous Oscillation problems caused by HVDC system are studied and analyzed intensively in this paper based on eigenvalue analysis method. By establishing the small signal linearized model of a typical HVDC system, subsynchronous oscillation characteristics of the system with or without SSDC are obtained. Further more, the influence of SSDC parameters to the system subsynchronous oscillation characteristic can be illustrated clearly. This is significant for SSDC design in order to achieve a satisfied restraining effect. Comparing with more accurate electromagnetic transient simulation results, the consistency of the two methods is verified and it can be demonstrated that eigenvalue analysis method is adequate for studying subsynchronous oscillations.

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

Research about Subsynchronous Oscillation Caused by High-Voltage-Direct-Current

2013 ◽  
Vol 805-806 ◽  
pp. 920-925
Author(s):  
Nan Zhou ◽  
Guan Rong Wang
Keyword(s):  
Subsynchronous Oscillation ◽  
Hvdc System ◽  
High Voltage Direct Current ◽  
Turbine Generators ◽  
Electrical Instability ◽  
Electrical Damping ◽  
Oscillation Frequencies ◽  
Damping Torque ◽  
System Frequency ◽  
Shaft Failure

Torsional interaction exists between HVDC converters and turbine-generators, and negative electrical damping provided by HVDC may cause subsynchronous oscillation (SSO) that can lead to turbine-generator shaft failure and electrical instability at oscillation frequencies lower than the fundamental system frequency. This paper makes a preliminary inquiry about the subsynchronous oscillation mechanism caused by the HVDC system, and puts forward Subsynchronous Damping Controller, and eventually makes a damping synchronous oscillation of the electrical Damping torque increment out of the generator electromagnetic torque to suppressing SSO.

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