This article proposes a high-frequency injection based dq-inductance estimation technique for synchronous machines. The d- and q-axis inductance is estimated using single HFI between d q axes, i.e., 45° angle. incremental variation over four quadrants dq-plane operating condition evaluated. proposed can operate in real-time without controlled position or velocity from the load side. Neither pre...

A modified four-dimensional linear active disturbance rejection control (LADRC) strategy is proposed for a dual three-phase permanent magnet synchronous generator (DTP-PMSG) system to reduce cross-coupling between the d and q axis currents in d-q subspace harmonic x-y subspace. In subspace, uses model-based LADRC enhance decoupling effect axes ability against parameter variation. 5th 7th curren...

We consider the problem of evaluating an XQuery query Q (involving only child and descendant axes) on an XML document D. D is stored on a disk and is read from there, in document order. Chen et al. [From Tree Patterns to Generalized Tree Patterns, Intl. Conf. on Very Large Databases, 2003, pp. 237-248] presented an algorithm to convert Q (from a large fragment of XQuery) into a Generalized Tree...

We study partially occupied lattice systems of classical magnetic dipoles which point along randomly oriented axes. Only dipolar interactions are taken into account. The aim of the model is to mimic collective effects in disordered assemblies of magnetic nanoparticles. From tempered Monte Carlo simulations, we obtain the following equilibrium results. The zero-temperature entropy approximately ...

We consider the XPath evaluation problem: Evaluate an XPath query Q on a streaming XML documentD; i.e., determine the setQ(D) of document elements selected byQ. We mainly consider Conjunctive XPath queries that involve only the child and descendant axes. Previously known in-memory algorithms for this problem use O(|D|) space and O(|Q||D|) time. Several previously known algorithms for the stream...

We prove a multivariate Whitney type theorem for the local anisotropic polynomial approximation in Lp(Q) with 1 ≤ p ≤ ∞. Here Q is a d-parallelepiped in R with sides parallel to the coordinate axes. We consider the error of best approximation of a function f by algebraic polynomials of fixed degree at most ri− 1 in variable xi, i = 1, ..., d, and relate it to a so-called total mixed modulus of ...

This paper presents a novel method to control sinusoidal distributed winding or back electromotive force (back-EMF) multi-phase permanent magnet (PM) machines under open-circuit fault conditions. In this study, five different conditions are considered: single-phase, adjacent double-phase, non-adjacent three-phase, and three-phase open circuit New current sets for the remaining healthy phase obt...

Stator flux oriented vector control of induction motor (IM) drives for speed sensorless control has several advantages. But the application of a pure integrator for the flux estimation is difficult due to the presence of measurement noise and dc offset. To overcome these problems, some have used a programmable cascaded low pass filter (PCLPF). In this paper, it is shown that some problems still...