Low speed test in two-axis actively positioned bearingless machines with non-collocated structure for wind power applications

In this paper, a stator inductance identification process is proposed. The process is based on a three-level neutral-point-clamped (NPC) inverter-fed induction motor (IM) drive with a standstill condition. Previously, a low-speed alternating current (AC) injection test for stator inductance identification was proposed to overcome practical problems in conventional identification methods for three-level NPC inverter-based IM drives. However, the low-speed AC injection test-based identification method has some problems if a heavy load or mechanical brake is connected, as these can forcibly bring the rotor to a standstill during parameter identification. Since this low-speed testing-based identification assumes the motor torque is considerably lower in low-speed operations, some inaccuracy is inevitable in this kind of standstill condition. In this paper, the proposed current injection speed generator is based on the previously studied low-speed test-based stator inductance identification method, but the proposed approach gives more accurate estimates under the aforementioned standstill conditions. The proposed method regulates the speed for sinusoidal low-frequency AC injection on the basis of the instantaneous reactive and air-gap active power ratio. This proposed stator inductance identification method is more accurate than conventional fixed low-frequency AC signal injection identification method for three-level NPC inverter-fed IM drive systems with a locked-rotor standstill condition. The proposed method’s accuracy and reliability were verified by simulation and experiment using an 18.5 kW induction motor.

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Simplified design of low speed electric permanent magnet generator for small wind power plant

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/403/1/012034 ◽

2018 ◽

Vol 403 ◽

pp. 012034

Author(s):

M Irfan ◽

E A Hakim ◽

D Suhardi ◽

N Kasan ◽

M Effendy ◽

...

Keyword(s):

Power Plant ◽

Permanent Magnet ◽

Wind Power ◽

Wind Power Plant ◽

Low Speed ◽

Permanent Magnet Generator

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DETERMINATION OF EXERGETIC EFFICIENCY OF LOW-SPEED WIND POWER INSTALLATION

Alternative Energy and Ecology (ISJAEE) ◽

10.15518/isjaee.2015.08-09.003 ◽

2015 ◽

pp. 27-32

Author(s):

A. V. Matveev ◽

S. E. Shcheklein

Keyword(s):

Wind Power ◽

Power Installation ◽

Exergetic Efficiency ◽

Low Speed ◽

Wind Power Installation

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Stator Inductance Identification Based on Low-Speed Tests for Three-Level NPC Inverter-Fed Induction Motor Drives

Electronics ◽

10.3390/electronics9010183 ◽

2020 ◽

Vol 9 (1) ◽

pp. 183 ◽

Cited By ~ 2

Author(s):

Yerganat Khojakhan ◽

Kyoung-Min Choo ◽

Chung-Yuen Won

Keyword(s):

Induction Motor ◽

Reactive Power ◽

Low Frequency ◽

Test Drive ◽

Identification Process ◽

Low Speed ◽

Speed Test ◽

Simulation And Experiment ◽

Sinusoidal Current ◽

Stator Flux

This paper proposes a stator inductance identification process for three-level neutral point clamped (NPC), inverter-fed Induction Motor (IM) drives based on a low-speed test drive. Conventionally, the stator inductance of an IM is identified by methods based on standstill or rotational tests. Since conventional standstill test-based methods have several practical problems when used with three-level inverters because of their nonlinearity, an identification method based on rotational tests is superior in such applications. However, conventional rotational tests cause unintended behavior because of the high speeds used during the test. In the proposed stator inductance identification process, the stator inductance is identified based on a low-speed test drive. In the proposed method, the stator flux is estimated using the instantaneous reactive power of the IM during low-frequency sinusoidal current excitation, and the stator inductance is then identified based upon this. Therefore, the proposed identification process is safer than conventional approaches, as it uses only a low-speed test. The accuracy and reliability of this method are verified by simulation and experiment using three motors with different rated voltage and power.

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Application of Topological Optimization Program to the Danner Test Simulation

Volume 2: 26th Design Automation Conference ◽

10.1115/detc2000/dac-14292 ◽

2000 ◽

Author(s):

Robert R. Mayer ◽

Detlev Maurer ◽

Curd Bottcher

Keyword(s):

Topological Optimization ◽

Insurance Companies ◽

Optimization Program ◽

Low Speed ◽

Insurance Premiums ◽

Speed Test

Abstract This study used a topological optimization program, TOPOPT, to optimize the crashworthiness performance of a small vehicle in a Danner test simulation. The Danner test is a low-speed test used by insurance companies to help set insurance premiums. New designs with added holes were developed using TOPOPT, and a procedure for applying the program to future vehicle programs was established.

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