نتایج جستجو برای: negative sequence current
تعداد نتایج: 1633578 فیلتر نتایج به سال:
ac railway traction loads are usually huge single phase loads. as a result, a significant amount of negative sequence current (nsc) is injected into utility grid. moreover, harmonics and consumption ofreactive power are further power quality problems that the supply network is encountering. in this paper, acompensation strategy with the aid of railway power conditioner (rpc) is proposed to over...
extension of inter-turn fault in windings of pmsm can damage all parts of electrical systems, and in some cases in sensitive applications may lead to irreparable events. identification of such small faults at incipient steps can be so helpful to protect entire part of electrical system. in this paper, intelligent protection system is designed which is made by two major parts. in the first part ...
the purpose of the present study was to investigate the relationship between fear of negative evaluation (fne) and communication strategies (css) among iranian efl learners. it was aimed to examine the differences in the use of communication strategies between speakers with high or low degree of fear of negative evaluation. the current study was a case study consisting of 10 english learners at...
The load unbalance is one of inherent features of distribution systems which draws a negative sequence current from islanded synchronous generators. This leads to overheating of the stator and, in particular, the rotor core. In such a case, it is not possible to operate the generator at its associated rated power. Thus, implementing an inverter-based resource in parallel with the synchronous ge...
This article presents a control scheme in the stationary reference frame for static synchronous compensators (STATCOMs) that provide three features: 1) regulation of positive-sequence voltage to nominal value; 2) full cancellation negative-sequence voltage; and 3) peak limitation injected currents. These features can help improve performance these devices under perturbed grid conditions, includ...
This paper presents a vector current controller (in the synchronous reference, or dq, frame) with negative-sequence injection capability for three-phase grid-connected converters. is desired operation of converter during unbalanced conditions and also certain type islanding detection. The proposed first determines double-frequency references then uses sixth-order two-input two-output proportion...
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