Analysis and enhancement of small‐signal stability on DFIG‐based wind integrated power system through the optimal design of linear quadratic regulator

Abstract

This study analyses the dynamic behaviour of a doubly fed induction generator (DFIG)-based wind integrated power system (WIPS) resulting from a major disturbance. The effects of transient disturbance on WIPS are examined without and with a controller in terms of performance and stability of the system. To enhance the performance of WIPS after a sudden disturbance, an optimally designed linear quadratic regulator (LQR) controller is applied to the system. The wind energy system is described in state-space representation, whose states and outputs are taken as feedback to the controller for improving their dynamic response. An artificial bee colony (ABC)-based swarm optimisation technique is used to evaluate the optimal weighting matrices of the LQR controller in parallel with minimising the performance index and dynamic response characteristics of the system. The effectiveness of the proposed ABC-LQR controller in WIPS is verified by comparing their simulation and numerical results with standard proportional-integral and LQR controllers. It indicates that the proposed controller provides better enhancement of dynamic response as compared with other controllers in terms of performance index and dynamic response characteristics. Moreover, the robustness and stability of various system configurations are tested by the eigenvalue analysis.

The admissible set of parameters guaranteeing small‐signal stability of a microgrid

“…However, microgrid possesses rotating generators and inverter-based renewable resources [7] and exhibits limited inertia. Inverter-based DERs can work in PQ control, PV control, and droop control modes [8,9], and the stability is affected by parameters of controllers and system equipment, which may be time-varying [8,10]. Hence, parametric uncertainty is a main challenge in the stability analysis of a multi-source microgrid with low inertia [11].…”

Dynamic evaluation of optimization techniques–based proportional–integral controller for wind-driven permanent magnet synchronous generator

“…DFIGs have the advantage of using a partial scale power converter. However, the machine stator in DFIGs is directly connected to the grid which affects the machine performance for any temporary faults or grid disturbances (Kumar and Chatterjee, 2020). Direct-driven PMSGs have become increasingly relevant in recent times because they have high torque to inertia ratio and high-power density.…”