Abstract – HVDC Power Oscillation Damping Controller Design Methodology and Application

To enhance system transient stability, modern excitation system of power plants normally acts very fast under voltage depressed conditions (such as fault condition). To achieve fast response, high transient gain is normally utilized in these excitation system.  While the fast acting excitation system helps system stability, it normally introduce negative damping at low frequencies, which could cause either interplant or interarea oscillations. Traditionally and still widely used as today, the Power System Stabilizers (PSS) can be used to damping these oscillations.  For an interarea oscillation, it normally involves install/tune PSSs from a wide range of power plants.

Using the HVDC link to help damping interarea oscillations is very attractive and effective when it directly connects these oscillations areas. Thus nearly all of the installed HVDC links have one or more Power Oscillation Damping (POD) controllers built in its control system. However, unlike the traditional PSS, there is no standard methodology to guide the design or tune the HVDC POD controllers. This presentation will provide a review on the POD design/tune process using eigenvalues and the residue method. An application of the residue method together with the study results will also be presented as an example study case.