Brushless doubly fed reluctance generator (BDFRG) has been recently suggested as a wind generator. Different control methods are presented in literature for the BDFRG, but there is a gap on control under unbalanced grid voltage condition (UGVC). This paper presents a predictive direct power control (PDPC) method for the BDFRG under UGVC. The proposed PDPC method is based on power compensation s...

This paper presents an effective rotor current controller for variable-speed stand-alone doubly fed induction generator (DFIG) systems feeding an unbalanced three-phase load. The proposed current controller is developed based on proportional plus two resonant regulators, which are tuned at the positive and negative slip frequencies and implemented in the rotor reference frame without decomposin...

This paper presents the designing of a power quality compensator to solve the power quality problem of negative-sequence and harmonic currents in high-speed railway traction systems. The proposed power quality compensator is constituted by railway static power conditioner (RPC), two thyristor-controlled reactors and two thyristor-controlled 3filters. The RPC contains two converters which are co...

The transient stability of traditional power systems is concerned with the ability generators to stay synchronized positive-sequence voltage network, whether for symmetrical or asymmetrical faults. In contrast, both positive- and negative-sequence synchronizations should be concern inverter-based generation (IBG) under This because latest grid codes stipulate that IBG inject dual-sequence curre...

Let and be a sequence with non-negative entries. If , denote by the infimum of those satisfying the following inequality: whenever . The purpose of this paper is to give an upper bound for the norm of operator T on weighted sequence spaces d(w,p) and lp(w) and also e(w,?). We considered this problem for certain matrix operators such as Norlund, Weighted mean, Ceasaro and Copson ma...

Inverter-Based Resources (IBRs), including Wind turbine generators (WTGs), exhibit substantially different negative-sequence fault current characteristics compared to synchronous (SGs). These differences may cause misoperation of customary negative-sequence-based protective elements set under the assumption a conventional SG dominated power system. The amplitude WTG is smaller than that an SG. ...

As the penetration of renewable energy increases year by year, risk high-frequency oscillation instability when a three-phase, four-wire split capacitor inverter (TFSCI) is connected to grid with complementary capacitors in weak grids. Compared three-wire inverter, TFSCI has an additional zero-sequence current loop. To improve accuracy modeling and stability analysis, effect loop needs be consi...