In order to ensure the safety of DFIG when severe fault happens, crowbar protection is adopted. But during slight fault condition, the crowbar protection will not trip, and the DFIG is still excited by AC-DCAC converter. In this condition, operation characteristics of the converter have large influence on the fault current characteristics of DFIG. By theoretical analysis and digital simulation,...

A virtually complete description of the topology of stationary incompressible Euler flows and the magnetic field satisfying the magnetostatic equation is given by a theorem due to Arnol'd. We apply this theorem to describe the topology of stationary states of plasmas with significant fluid flow, obeying the Hall magnetohydrodynamics model equations. In the context of the integrability (nonchaot...

This paper presents a novel approach to current signature analysis based on wavelet transform of the stator current. The proposed method lies in the fact that by using wavelet transform, the inherent non-stationary nature of stator current can be accurately considered. The key characteristics of the proposed method are its ability to provide feature representations of multiple frequency resolut...

Pulsed Eddy Current (PEC) sensing is used for Non-Destructive Evaluation (NDE) of the structural integrity of metallic structures in the aircraft, railway, oil and gas sectors. Urban water utilities also have extensive large ferromagnetic structures in the form of critical pressure pipe systems made of grey cast iron, ductile cast iron and mild steel. The associated material properties render N...

Flexible Alternating Current Transmission Systems (FACTS) devices have been used for several targets in power system, one of the main contributions of the devices is improving operation conditions. In this paper, two types of these devices have been placed to raise voltage profile, minimizing system loss and arising loadability. The suggested FACTS devices are: Unified Power Flow Controller (UP...

The budgetary capacity with the tax component as its key aspect is the basis for forming local budgets of a territorial community. The paper outlines the methods for diagnostics of the budgetary capacity of territorial communities by revenues aimed at providing a comprehensive quantitative and qualitative assessment of the status, strengths, and weaknesses of the economy of an administrative-te...

Social media are part of our everyday lives. These technologies allow people to share their opinions with others. Here I examine whether the opinions posted online actually change people’s perception of the world or they simply serve as anchors when people post their own opinions. Participants rated the interestingness of given stories. In one condition, the stories were presented with invented...

This paper will describe some of the findings of the current UK Teaching Company Directorate funded collaborative research between consultants, Building Performance Group and the University of the West of England. The objective of the research is to provide a practical database on the durability of components and materials used in the construction industry. The current second stage of the resea...