The modern power system provides an unstable working environment, which accelerates inverter failures. This brief proposes an intelligent fault diagnosis method for inverters via telescoping modulus ...convolutional neural networks (TMCNN). To be specific, a telescoping modulus (TM) approach is first designed to augment the output current modulus by the telescoping length, and the telescoping function then synthesizes the samples. The synthetic samples are finally trained through convolutional neural networks (CNN), and online monitoring data are recognized with trained models. Experimental results on 5-level inverter platforms validate the satisfying generalization capability and high accuracy of the proposed method.
To enhance the output power level of wireless charging applications, multi-phase inverters are usually required to work in parallel. Even though the same pulse-width modulated signals are applied for ...the corresponding switches, there can still be phase differences in the driving pulses which directly turn on/off the switches, due to the inconsistency in the switch parameters or driving circuits. The different driving pulses can result in large circulating currents, which decrease the power level. There is a need for a current balancing technique that can be used to solve this problem. This letter proposes a passive current balancing method for wireless charging. Compared with the existing method, the proposed method can reduce the number of coupled inductors by half and balance every two sources to achieve good current balancing performance. An inductor-capacitor-capacitor series (LCC-S) compensated wireless power transfer (WPT) experimental prototype is built to validate the effectiveness of the proposed current sharing method.
This paper considered a six-phase (asymmetrical) induction motor, kept 30° phase displacement between two set of three-phase open-end stator windings configuration. The drive system consists of four ...classical three-phase voltage inverters (VSIs) and all four dc sources are deliberately kept isolated. Therefore, zero-sequence/homopolar current components cannot flow. The original and effective power sharing algorithm is proposed in this paper with three variables (degree of freedom) based on synchronous field oriented control (FOC). A standard three-level space vector pulse width modulation (SVPWM) by nearest three vectors (NTVs) approach is adopted to regulate each couple of VSIs. The proposed power sharing algorithm is verified by complete numerical simulation modeling (Matlab/Simulink-PLECS software) of whole ac drive system by observing the dynamic behaviors in different designed condition. Set of results are provided in this paper, which confirms a good agreement with theoretical development.
This chapter contains sections titled:
Preliminary Remarks
Classification of PWM Schemes for Voltage Source Inverters
Pulse Width Modulated Inverters
Three‐phase PWM Voltage Source Inverter
...Relationship between Carrier‐based PWM and SVPWM
Multi‐level Inverters
Impedance Source or Z‐source Inverter
Quasi Impedance Source or qZSI Inverter
Dead Time Effect in a Multi‐phase Inverter
Summary
Problems
References
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