Multi-machine transient modelling of wind farms: An essential approach to the study of fault conditions in the distribution network

A simplified model of Type‐4 wind turbine for short‐circuit currents simulation analysis

“…In order to protect the power electronic switches of the converter, U chopper is generally not greater than 1.1 times of $$u_{{\rm{dc}}}^*$$ [21]. Therefore, $${( {\Delta {u_{{\rm{dc}}}}(t)} )^2}$$is much smaller than $$| {u_{{\rm{dc}}}^*\Delta {u_{{\rm{dc}}}}(t)} |$$.…”

“…Most of equivalent methods of clustering the WTGs are according to the WPP structure, wind speed and states of low-voltage ride through of WTGs, and build the equivalent WTG model of each cluster. Three to five equivalent WTG models are generally used to replace a small-scale WPP with 50 WTGs to meet requirements of EMT analysis of short-circuit currents [18][19][20][21]. These aggregated equivalent methods can help reduce the amounts of WTG models in simulation to improve the simulation efficiency.…”

Enhancing the performance of DFIG variable speed wind turbine using a parallel integrated capacitor and modified modulated braking resistor

“…2, based on the available wind speed, the power (P T = P s + P g ) is delivered to the PCC via the rotor and stator circuits, respectively, when the rotor speed is greater than the synchronous speed ω r > ω s . For the reverse case, when ω r < ω s , only active power P s is transferred via the stator circuit to the PCC, while the active power P r is absorbed from the PCC through the power converter [45]. If vector control is applied to the synchronous stator frame in d-q orientation axis, based on the DFIG compensation methods and control strategy, then a model of the wind generator based on the fifth-order d-q representation could be achieved [46].…”

Fast adaptive back‐stepping terminal sliding mode power control for both the rotor‐side as well as grid‐side converter of the doubly fed induction generator‐based wind farms

“…The application of the conventional non‐linear sliding mode control (SMC) approach to improve the stability of the multimachine power network (MMPN) is presented in [13–16]. Selecting a perfect hyper‐plane for the non‐linear systems, for attaining an asymptotic stability is an important issue for the conventional SMCs.…”