Abstract
Advances in power electronics over several decades has led to high voltage direct current (HVDC) transmission emerging as a good option for electricity transmission in many circumstances, and it is able to integrate with, and augment, conventional high voltage alternating current (HVAC) transmission. Different conditions such as AC system strength, controller parameter and wind power generation levels have an effect on the small signal stability of the system. Power System Stabilizers (PSS) as well as Thyristor Controlled Series Compensators (TCSC) are Power Oscillation Damping Controllers which are usually implemented as mitigation for electromagnetic modes. This paper looks at the design and implementation of the PSS and TCSC in a VSC based HVDC monopole system with onshore wind generation. The performance of the two are compared. It is found that PSS offers slightly better damping of a poorly damped electromechanical mode than TCSC. PSS are also faster than TCSC in damping out this mode, as the settling time is shorter.
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