Impact of active power recovery rate of DFIG wind farms on first swing rotor angle stability

Abstract

The first swing rotor angle stability is still an important stability challenge for modern power systems integrated with a large number of renewable energy‐based sources, such as wind farms and solar‐photovoltaic farms. Therefore, innovative strategies must be developed to exploit the full potential of doubly fed induction generators (DFIGs) to improve the first swing rotor angle stability in the system. This study presents a new active power logic (APL) controller for DFIGs which can reduce the active power during the fault and slowly recover it after the fault to allow synchronous generators to increase the electrical power during and after the fault; thus, enabling synchronous generators to improve the first swing rotor angle stability. The feasibility of the proposed control scheme is investigated via theoretical analysis and simulation studies. The reliability and voltage stability test system is used to demonstrate the effectiveness of the proposed scheme for local and remote faults and increased DFIG penetration conditions. The comparative results show that the proposed APL controller of the DFIG improves the first swing rotor angle stability, specifically when the DFIGs are located near the synchronous generators.

Suppression to Angular Oscillation among Synchronous Generators by Optimizing Parameters and Set-Points of Synchronous Condenser and High-Voltage DC

“…By eliminating the frst row, the sensitivity of the voltage with respect to the reactive power is obtained in the following equation. Taking the same increment in the reactive power, the relative voltage sensitivity SRV is given by (3).…”

“…Te angular oscillation among the synchronous generators (SGs) after large disturbances endangers the security of the power systems. To suppress the oscillations, one may introduce the supplementary controllers, e.g., the power system stabilizer (PSS) of the SGs or the power oscillation damper of the doubly-fed induction generators (DFIGs) [1,2], or adjust the output of the DFIGs or the energy storage [3,4]. In [5], the parameters of the PSS and the static var compensator are optimized in coordination with the particle swarm optimization (PSO) to suppress the oscillations.…”

“…It is difcult to derive the analytical expression of the TS from the parameters related to the active and reactive powers since the latter may be shown in the power fow equations instead of the dynamic modeling [31]. (3) How to optimization to the control parameters and the set-points together. Te control parameters, such as PI parameters and time constants, afect the dynamic process but have no impact during the steady state.…”

Transient stability analysis of DFIG-based wind farm-integrated power system considering gearbox ratio and reactive power control

“…Therefore, the performance of the DFIG under these conditions can considerably affect system stability [41]. In this way, it is very important to investigate a suitable method to enhance the stability and LVRT capability during the fault [42,43]. Therefore, as the first work in this paper, the impact of Q DFIG and P DFIG has been investigated independently on improving the transient stability of the power system.…”