Topic
Variable-frequency drive
About: Variable-frequency drive is a research topic. Over the lifetime, 837 publications have been published within this topic receiving 5691 citations. The topic is also known as: VFD.
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TL;DR: In this article, a mixed integer non-linear model is developed for the optimal synthesis of cooling water pumping systems according to design and operating requirements, where the decision variables are pump and motor models to use, the number of pumps in the system, the pump operating point, and the VFD-operated motors.
5 citations
Patent•
09 Jul 2015
TL;DR: In this paper, a variable frequency motor drive system including a rectifier, a DC bus electrically coupled with the rectifier and an inverter was described, and a protection device was configured to interrupt power supply to the system based upon fault conditions.
Abstract: Overvoltage protection apparatuses, systems and methods for variable frequency motor drives are disclosed. In an exemplary embodiment, a variable frequency motor drive system including a rectifier, a DC bus electrically coupled with the rectifier, and an inverter electrically coupled with the DC bus is provided. A protection device electrically coupled with the rectifier and configured to interrupt power supply to the system based upon fault conditions is provided. A controller is provided and configured to receive information indicative of a voltage of the DC bus, process the received information to model a condition of at least one component of the variable frequency motor drive, and control the protection device to interrupt power supply to the variable frequency motor drive if the modeled condition meets a fault criterion.
5 citations
21 May 2015
TL;DR: In this article, the voltage non-sinusoidality ratio of the electric mains supplying electric drives with high voltage frequency convertors with various rectification circuits is calculated for the cases with six- or similar twelve-phase rectifiers and various relations of inductive impedance of the matching transformer (input reactor) and similar one of the system.
Abstract: The paper gives the procedure for calculation of the voltage non-sinusoidality ratio of the electric mains supplying electric drives with high voltage frequency convertors. It includes the calculation charts which help to predict its value for the cases with six- or similar twelve-phase rectifiers and various relations of inductive impedance of the matching transformer (input reactor) and similar one of the electric supply system. The paper determines the ratio of short circuit power and variable frequency drive power providing specified values of the non-sinusoidality ratio for convertors with various rectification circuits. It considers activities providing electromagnetic compatibility of the power frequency convertors with the electric supply main. They include changes within the electric supply system structure, improvement of the frequency converter circuits and application of devices for changing the unified power quality index. It proves that it is more reasonable to raise the rectifier pulse number and apply the rectifier with pulse width modulation.
5 citations
26 Apr 2021
TL;DR: In this article, a detailed power loss calculation and thermal model is developed and tested on a 480 V, 186 A, 150 HP variable frequency drive (VFD) with SiC modules.
Abstract: Silicon carbide (SiC) devices can exhibit simultaneously high electro-thermal conductivity and extremely fast switching. To perform optimal designs showing the benefits of SiC in achieving efficiency, size, weight, and cost objectives for electric converters design, it is necessary to establish better models for calculating device losses and an efficient thermal model that can be calibrated to consider the nuances of measurement based thermal equivalent circuits. This work's outputs can be used in a power converter multi-objective optimization process or real-time temperature prediction of drives to improve reliability and maximize performance. The proposed modified loss calculation and thermal model demonstrate the SiC power module's advantages to reduce peak junction temperature and power cycling effects. A detailed power loss calculation and thermal model is developed and tested on a 480 V, 186 A, 150 HP variable frequency drive (VFD) with SiC modules. A comparison between the SiC module and an equivalent rated Si module demonstrates the reduction in power cycling effects, particularly at low-speed operation. Infrared (IR) imaging results and analytical explanations of the phenomenon is provided. Power cycle tests show that higher thermal conductivity is not the only reason contributing to the lower temperature ripple in low-speed operation.
5 citations
TL;DR: In this article, the authors describe experimental measurements carried out on a new design of pool pump system, which achieved energy savings of 40% using variable frequency drive (VFD) with a standard, single phase pump/motor system.
5 citations