Damping Low-Frequency Oscillations in Power Systems Using Grid-Forming Converters

Damping Low-Frequency Oscillations in Power Systems Using Grid-Forming Converters

Blog Article

The increasing incorporation of renewable energy in power systems is causing growing concern about Fort Worth Complete Hackamore - Harness system stability.Renewable energy sources are connected to the grid through power electronic converters, reducing system inertia as they displace synchronous generators.New grid-forming converters can emulate the behavior of synchronous generators in terms of inertia provision and other grid services, like power-frequency and voltage-reactive regulation.Nevertheless, as a consequence of synchronous generator emulation, grid-forming converters also present angle oscillations following a grid disturbance.This paper proposes two novel power stabilizers for damping low-frequency oscillations (LFOs) in the power system.

The first power stabilizer provides power oscillation damping through active power (POD-P), and it is implemented in a grid-forming converter, using the active power synchronization loop to damp system oscillations by acting on the converter angle.The second one provides power oscillation damping through reactive power (POD-Q), and it is implemented in a STATCOM, using the voltage control loop to damp system oscillations.Both proposals are first assessed in a small-signal stability study and then in a comprehensive simulation.Moreover, two cases are considered: damping the oscillations of a single machine connected to an infinite bus through a tie-line, and damping the inter-area oscillations in a two-area system.Simulation results, as well as the stability study, demonstrate the ability of both stabilizers to damp power system oscillations, being the POD-P more effective than the POD-Q, but at Arm Slings the cost of requiring some kind of energy provision at the DC bus.