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Energy optimal control strategies for electro motors; low-cost and sensorless PWM-VSI based induction motor control. Vol. 1: Main report, appendix and annex

Abstract

When variable speed induction motor drives are used in applications that run at low load for long periods, energy can be saved by reducing the motor flux at low load. In this report the efficiency of 2.2 kW standard and high-efficiency motor drives are investigated experimentally with efficiency optimized and constant flux control, with sinusoidal and PWM voltage supply and with varying switching frequency. Steady-state motor models are developed and verified experimentally, and are used to analyze and develop efficiency optimizing control strategies. Four energy optimal control strategies are tested experimentally: cos({phi}) control, model-based control, off-line calculated airgap flux control and stator current/input power minimising search control. Their dynamical properties and their ability to reject load disturbances are analysed. Their ability to save energy is tested on a water pump system. For a typical predefined test-cycle the energy optimal control reduces the energy consumption with 10% compared with classical constant V/Hz control. (au)
Authors:
Publication Date:
Feb 01, 1998
Product Type:
Technical Report
Report Number:
NEI-DK-3240
Reference Number:
SCA: 320106; PA: DK-98:001572; EDB-98:099907; SN: 98002004237
Resource Relation:
Other Information: DN: EFP-95; PBD: Feb 1998
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; ELECTRIC MOTORS; OPTIMIZATION; ENERGY CONSUMPTION; INDUCTION; CONTROL EQUIPMENT; DYNAMIC LOADS; STEADY-STATE CONDITIONS; INVERTERS; EFFICIENCY; SPACE HVAC SYSTEMS
OSTI ID:
645040
Research Organizations:
Aalborg Univ. (Denmark). Inst. for Energiteknik; ABB Motors A/S, Odense (Denmark); Danfoss A/S, Nordborg (Denmark)
Country of Origin:
Denmark
Language:
English
Other Identifying Numbers:
Other: ON: DE98777231; CNN: Contract ENS-1253/95-0001; ISBN 87-89179-23-4; TRN: DK9801572
Availability:
OSTI as DE98777231
Submitting Site:
DK
Size:
268 p.
Announcement Date:

Citation Formats

Abrahamsen, F. Energy optimal control strategies for electro motors; low-cost and sensorless PWM-VSI based induction motor control. Vol. 1: Main report, appendix and annex. Denmark: N. p., 1998. Web.
Abrahamsen, F. Energy optimal control strategies for electro motors; low-cost and sensorless PWM-VSI based induction motor control. Vol. 1: Main report, appendix and annex. Denmark.
Abrahamsen, F. 1998. "Energy optimal control strategies for electro motors; low-cost and sensorless PWM-VSI based induction motor control. Vol. 1: Main report, appendix and annex." Denmark.
@misc{etde_645040,
title = {Energy optimal control strategies for electro motors; low-cost and sensorless PWM-VSI based induction motor control. Vol. 1: Main report, appendix and annex}
author = {Abrahamsen, F}
abstractNote = {When variable speed induction motor drives are used in applications that run at low load for long periods, energy can be saved by reducing the motor flux at low load. In this report the efficiency of 2.2 kW standard and high-efficiency motor drives are investigated experimentally with efficiency optimized and constant flux control, with sinusoidal and PWM voltage supply and with varying switching frequency. Steady-state motor models are developed and verified experimentally, and are used to analyze and develop efficiency optimizing control strategies. Four energy optimal control strategies are tested experimentally: cos({phi}) control, model-based control, off-line calculated airgap flux control and stator current/input power minimising search control. Their dynamical properties and their ability to reject load disturbances are analysed. Their ability to save energy is tested on a water pump system. For a typical predefined test-cycle the energy optimal control reduces the energy consumption with 10% compared with classical constant V/Hz control. (au)}
place = {Denmark}
year = {1998}
month = {Feb}
}