Journal ArticleDOI
A three-phase sag generator for testing industrial equipment
E.R. Collins,R.L. Morgan +1 more
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TLDR
The sag generator enables the user to systematically determine the sensitivity of the components of an installed process line to determine cost-effective ride-through enhancement strategies or to test the effectiveness of currently installed equipment.Abstract:
A diesel powered three-phase standby 480 V, 15 kW, 60 Hz synchronous generator has been modified to give controlled three-phase voltage sags. These sags can be controlled in both depth and duration. A 486-based computer with a data acquisition system controls the generator and monitors the system under test. The custom software interface allows the user to select the depth and duration of the each sag. Typically, the user will select a series of sags in selectable increments down to a certain depth. The data acquisition system has both digital and analog inputs, so that data lines, AC and DC voltages and currents, contactors and relays, etc. can be monitored during the tests. The software interface enables the user to select allowable tolerance bands for the monitored signals. If one or more of the signals falls outside the allowable range, the test is suspended. The sag depth and duration that caused the equipment to "fail" the test is then recorded, After testing over a range of sag durations, a CBEMA-type curve is available for the system under test. The sag generator enables the user to systematically determine the sensitivity of the components of an installed process line. This will enable the user to determine cost-effective ride-through enhancement strategies or to test the effectiveness of currently installed equipment. Although this test generator is small, the basic concept can be scaled up to the 2 MVA range.read more
Citations
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Journal ArticleDOI
Characterisation of voltage sags experienced by three-phase adjustable-speed drives
TL;DR: In this paper, it was shown that voltage sags experienced by three-phase loads such as adjustable-speed drives can be classified into four types, and each sag can further be characterized by a magnitude and a phaseangle jump.
Journal ArticleDOI
A Novel Software Implementation Concept for Power Quality Study
Mladen Kezunovic,Y. Liao +1 more
TL;DR: A novel concept for power quality study that integrates the power system modeling, classifying, and characterizing of power quality events, studying equipment sensitivity to the event disturbance and locating the point of event occurrence into one unified frame is proposed.
Journal ArticleDOI
Implementation of Fault Ride-Through Techniques of Grid-Connected Inverter for Distributed Energy Resources With Adaptive Low-Pass Notch PLL
TL;DR: In this paper, the authors proposed fault ride-through techniques based on a low-pass notch phase-locked loop (LPN)-PLL, which has not only fast and smooth transient responses to a sudden transition of the grid voltage but also has robustness to the distorted and unbalanced grid conditions.
Journal ArticleDOI
The design of power acceptability curves
TL;DR: In this paper, the concept of "standards" is introduced for the design of power acceptability curves, which are aides in the determination of whether the supply voltage to a load is acceptable for the maintenance of a load process.
References
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L. Conrad,K. Little,C. Grigg +2 more
TL;DR: The authors show how to combine accepted analysis tools to predict all the important characteristics of voltage dips, and offer suggestions for coping with voltage dips that cannot be eliminated.
Journal ArticleDOI
The influence of motor re-acceleration on voltage sags
TL;DR: In this article, a simple motor model is implemented in a method for including interruptions due to voltage sags in the reliability analysis of power systems, and a stochastic voltage sag table is determined.
Proceedings ArticleDOI
Voltage sag analysis case studies
TL;DR: In this article, the results from a number of different voltage sag investigations are summarized and possible solutions to voltage sag sensitivity problems are also described, as well as possible solutions for possible solutions.
Journal ArticleDOI
Power quality and factory automation
TL;DR: In this article, a case study involving monitoring power quality disturbances at a representative plant and identifying the disturbances that disrupt production is described, where the sensitivities of representative electronic control equipment to the identified disturbances were measured and then projected to form a plant disturbance threshold.
Proceedings ArticleDOI
Effects of momentary voltage dips on the operation of induction and synchronous motors
TL;DR: Simplified stability calculations of induction and synchronous motors on voltage dips are presented in this article, where the motor characteristics influencing stability are: the type of motor selected (synchronous or induction); the pull-out torque of synchronous motor and the breakdown torque of induction motors; a constant excitation controller or an excitation boost on voltage dip for the synchronous MC; load and motor inertia; and load characteristics.