Effect of DFIG control parameters on small signal stability in power systems

Abstract

The doubly-fed induction generator (DFIG) with virtual inertia control and reactive damping control gives a renewable energy generation system inertia and damping characteristics similar to those of a thermal power plant, and the parameters of the control strategy have a direct impact on the small-signal stability of the system. This paper firstly introduces the operating characteristics and control strategies of DFIG-based damping control and virtual inertia control, establishes a small-signal model of the control-based DFIG integrated interconnected system, and investigates the effects of virtual inertia and reactive damping values on the small-signal stability of the system; then, the maximum damping ratio of the interval oscillation mode in small disturbance analysis is taken as the optimization objective, and the control parameters are the optimization variables. An optimization method of inertia and damping parameters is established for improving the small disturbance stability of the system. The results show that the optimization procedure could improve the damping ratio of the interval oscillation mode while ensuring the system frequency. The effects of virtual inertia and reactive damping values on the small signal stability of the system are investigated, and an optimal allocation model and method for virtual inertia used to improve the small disturbance stability of the system is proposed.

Current Bunching Effect of Large-Scale Alkaline Hydrogen Evolution

“…However, the consumption capacity of the power system is limited [4][5][6] . With the further increase of penetration, the intermittence and fluctuation of RESs will threaten the stability of power system, like wide-band oscillation [7][8] , insufficient inertial [9][10] and so on. To make the utmost of RESs and break through the limitation, the hydrogen production technology by electrolyzing water using the surplus renewable electricity, namely green hydrogen, is considered as a promising solution [11][12] .…”