Low-THD, Fast-Transient, and Cost-Effective Synchronous-Frame Repetitive Controller for Three-Phase UPS Inverters

Unbalance is one of the most common mechanical faults in rotating machines. Different balancing methods to stabilize the unbalanced rotor are investigated in this paper. One approach of using solely the accelerometers data and intricate vibration theories is discussed. Although the method can eliminate the need of balancing equipment, and the amplitude and phase of the machine’s vibrations can be identified, it needs numerous measurements, and in some cases is impossible to be implemented. Therefore, a novel approach with reduced number of required measurements is proposed. Our method only requires two measurements, one from the original unbalanced condition, and the other from modified situation after adding an arbitrary trial mass to a marked location on the rotor. The rotating rotor is being video recorded during this process. The goal is to identify the position of the marked area whenever the amplitude of the sinusoidal vibration response reaches the maximum. To demonstrate the effectiveness of our method, an experiment is setup. Vibration of healthy and unbalanced flywheel attached on a three-phase induction motor is analyzed in both time and frequency domains. The rotation of the motor is video recorded under original unbalanced and modified situations. The correction mass and its adding location are calculated using proposed method. The vibration analysis of balancing result demonstrated that the system got dynamically balanced by adding right value and location of a mass. The method proposed and developed in this paper is more cost effective with the same accuracy as the other contested balancing techniques.

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Cost-Effective Three-Phase PMSM Drive Tolerant to Open-Phase Fault

IEEE Transactions on Industrial Electronics ◽

10.1109/tie.2015.2437357 ◽

2015 ◽

Vol 62 (11) ◽

pp. 6708-6718 ◽

Cited By ~ 31

Author(s):

Andraz Kontarcek ◽

Primoz Bajec ◽

Mitja Nemec ◽

Vanja Ambrozic ◽

David Nedeljkovic

Keyword(s):

Cost Effective ◽

Open Phase ◽

Three Phase

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Study and Implementation of a Cost-Effective 3L-Active Rectifier for DC Collection in WECS

E3S Web of Conferences ◽

10.1051/e3sconf/201911802065 ◽

2019 ◽

Vol 118 ◽

pp. 02065

Author(s):

Muhammad Luqman ◽

Gang Yao ◽

Lidan Zhou ◽

Di Yang ◽

Anil Lamichhane

Keyword(s):

Low Cost ◽

Cost Effective ◽

Cost Comparison ◽

Multilevel Converters ◽

Wind Generators ◽

Active Rectifier ◽

Vienna Rectifier ◽

Three Phase ◽

Control Scheme ◽

Parallel Configuration

Power electronic converters are widely used in wind energy conversion system (WECS) applications. Therefore, with the increasing manufacturing capacity of multi-MW wind generators, multi-level converters, or parallel configuration of converters are becoming more attractive solutions towards DC collection from the wind generator. Among the multilevel converters, three-level full-scale neutral point diode clamped (3L-NPC) converter are using extensively for such applications in order to reduce the voltage stress on the semiconductor devices. In this article, a comparative study based on several devices used by NPC, capacitor clamped (CC) as well as Vienna rectifier has been done. Furthermore, their estimated cost comparison and complexity of control switches have been debated. By keeping in view the merits and demerits of these rectifiers, a low cost three-level active rectifier having a smaller number of active switches with a simple control scheme have been implemented. Considering a three-phase electric grid as a generated source, a 2.2KW low-cost three-level Vienna rectifier is simulated using MATLAB/Simulink. DSP (TMS320F28335) based experimental results ratify the simulated circuit with THD<5%.

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