Fast frequency support control in the GB power system using VSC-HVDC technology

Abstract

A fast frequency support control scheme for voltage source converter based high-voltage direct-current (HVDC) links has been designed, simulated and experimentally implemented and validated. The effectiveness of the proposed scheme has been tested on simplified GB power system models with both averaged and switched converter models. System performance has been initially assessed using different software simulation platforms (PSCAD and MATLAB/Simulink). System validation has been carried out using an experimental test-rig. It is shown that simulation and experimental results agree on well when the fast frequency support provision is enabled. For completeness, the effectiveness of the control scheme has been tested for two contingency scenarios: (i) when a high-voltage alternating-current interlink in parallel with the HVDC link is disconnected, and (ii) for a substantial increase in system load.

Two-layer control structure for enhancing frequency stability of the MTDC system

“…On the other hand, multi-terminal dc (MTDC) systems are widely used for the integration of RES and have the capability to change the active power fast. Because of their flexibility, MTDC systems are seen as a valuable resource that can provide fast frequency response (FFR) in low-inertia grids [2,3]. Although AC systems connected through the MTDC grid are independent in terms of frequency stability, they can share power reserves and provide frequency support to another AC system after a frequency disturbance.…”

Auxiliary dead‐band controller for the coordination of fast frequency support from multi‐terminal HVDC grids and offshore wind farms

“…HVDC converters, wind turbines (WTs) and other power electronics based low carbon generators do not contribute to the system inertia. Therefore, changes in the generation mix of power systems with a high penetration of renewables will lead to a major reduction in the total inertia [3]. This reduction translates into higher frequency deviations and a faster rate of change of frequency ( RoCoF ) when the grid experiences a disturbance [3].…”