DFIG use with combined strategy in case of failure of wind farm

Abstract

In the wind power area, Doubly Fed Induction Generator (DFIG) has many advantages due to its ability to provide power to voltage and constant frequency during rotor speed changes, which provides better wind capture as compared to fixed speed wind turbines (WTs). The high sensitivity of the DFIG towards electrical faults brings up many challenges in terms of compliance with requirements imposed by the operators of electrical networks. Indeed, in case of a fault in the network, wind power stations are switched off automatically to avoid damage in wind turbines, but now the network connection requirements impose stricter regulations on wind farms in particular in terms of Low Voltage Ride through (LVRT), and network support capabilities. In order to comply with these codes, it is crucial for wind turbines to redesign advanced control, for which wind turbines must, when detecting an abnormal voltage, stay connected to provide reactive power ensuring a safe and reliable operation of the network during and after the fault. The objective of this work is to offer solutions that enable wind turbines remain connected generators, after such a significant voltage drop. We managed to make an improvement of classical control, whose effectiveness has been verified for low voltage dips. For voltage descents, we proposed protection devices as the Stator Damping Resistance (SDR) and the CROWBAR. Finally, we developed a strategy of combining the solutions, and depending on the depth of the sag, the choice of the optimal solution is performed.

Intensifications reactive power during of asymmetric network outages in dual-stator winding generators

“…While the superiority of the control algorithm has been derived to prevent power line outage through this short-term fault between grid-generator, by compensating suitable reactive power and dispensing the common crowbar circuits [22]. The reactive power compensating to the grid is one of the low voltage ridethrough (LVRTH) requirements to avoid the drop-in voltage through fault occurrence [23]. Therefore, the establishing trigger fault command estimator model for estimating reactive power should take into account the essential dynamic model d-q equation of the excited doubly stator winding reluctance machine, Figure 2 shows control algorithm configuration as well exited trigger fault command of the machine, the following equations are dynamic model d-q of DSWRG [24].…”

Wind turbine doubly-fed induction generator defects diagnosis under voltage dips

“…The aim of our research is to improve the performance of wind power systems in the case of a disrupted grid. Emphasis is on detecting, identifying voltage dips [6], [7], and developing strategies for advanced control with protection systems of the wind turbine conversion chain, in order to satisfy the constraint of remaining connected during a voltage dip [3], [8]. Several [6], [9], [10].…”

Impact of renewable energy sources technologies on power system stability: a Moroccan case study

“…In this context, the majority of countries proposed various grid code (GC) to tackle RES integration problems and to ensure the PS stability [2], [3]. All these issues have led to an intensive research activity of PS stability assessment and the design of advanced controllers for RES to tackle the PS stability problems [4]- [8].…”