Power system stability enhancement via VSC-HVDC control using remote signals:

Application on the Nordic 44-bus test system

In this paper the benefits of embedded VSC-HVDC links with supplementary controls for small-signal stability enhancement purposes using remote signals are studied and applied on the Nordic Grid. Firstly the structure of phasor models for the study of large power systems is presented. A current injection model of the VSC-HVDC link suitable for phasor simulation of large-scale power system is presented. For the analysis and simulations, the tools developed during the iTesla project are used to assess the stability of different operating points of the Nordic Grid. The studied operating points are found based using the actual power flow data of the real system provided by the Nordic44-Nordpool repository. Through small signal analysis the most weakly damped oscillation modes of the system are identified. Based on the computation of the participation factors, the nature of the oscillations are identified and also for the unstable operating points the sources of instability are determined. Finally a control based on the measurement of remote signals is implemented for the modulation of the active power of the embedded HVDC link with the aim of improving the stability of the system.

J. C. Gonzalez-Torres*, J. Mermet-Guyennet, S. Silvant and A. Benchaib – SuperGrid Institute SAS France

Conference: IET ACDC 2019 conference