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|Title: ||Output feedback SSR damping controller design based on modular discrete-time dynamic model of TCSC|
|Authors: ||JOSHI, SR|
|Keywords: ||subsynchronous oscillations|
|Issue Date: ||2009|
|Publisher: ||INST ENGINEERING TECHNOLOGY-IET|
|Citation: ||IET GENERATION TRANSMISSION & DISTRIBUTION, 3(6), 561-573|
|Abstract: ||This paper presents the use of a modular, sample invariant, six samples per cycle, discrete-time model of a thyristor controlled series capacitor (TCSC) for output feedback-based subsynchronous resonance (SSR) damping controller (SSDC) design. An SSDC is used to alleviate the instability of torsional modes caused by external fixed capacitors used in conjunction with a TCSC. It is found that damping torque analysis-based design of an SSDC using a non-local signal like generator slip is straightforward and the resulting SSDC has a simple compensator structure. On the other hand, the residues and pole-zero configuration with the line current magnitude as a feedback signal are such that it is relatively more difficult to obtain a robust design, especially if several subsynchronous torsional modes are present. Eigenvalue analysis and digital simulation studies indicate that the TCSC model can accurately predict the behaviour of a TCSC with and without a damping controller.|
|Appears in Collections:||Article|
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