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Energies 2018, 11(8), 2047; https://doi.org/10.3390/en11082047

Mitigation of DC Components Using Adaptive BP-PID Control in Transformless Three-Phase Grid-Connected Inverters

1
School of Mechanical and Electrical Engineering, Institute for Electric Vehicle Driving System and Safety Technology, University of Electronic Science and Technology of China, Chengdu 611731, China
2
State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China
3
School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
4
Department of Electronics & Information Engineering, Chonbuk National University, Jeonju 567, Korea
*
Author to whom correspondence should be addressed.
Received: 9 July 2018 / Revised: 2 August 2018 / Accepted: 4 August 2018 / Published: 7 August 2018
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Abstract

Transformerless grid-connected inverters, due to their advantages of high efficiency, small volume and light weight, have been the subject of more research and interest in recent years. Due to the asymmetrical driving signal in pulse width modulation (PWM) caused by time-delay, zero-drift of the current sensors and imparities of the power transistors, output of the grid current contains dc component. As a result, power quality of the grid is degraded. In this paper, a dc (direct current) component suppression scheme with adaptive back-propagation (BP) neural network proportional-integral-differential (PID) control is proposed for dc component minimization. Moreover, sliding-window-double-iteration-method (SWDIM) is utilized for fast dc component extraction. Compared with the conventional method, the proposed scheme shows better performance, and the dc component can be attenuated to be within 0.5% of the rated current. View Full-Text
Keywords: dc component; power quality; adaptive back-propagation; neural network; grid-connected inverter dc component; power quality; adaptive back-propagation; neural network; grid-connected inverter
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Bo, L.; Huang, L.; Dai, Y.; Lu, Y.; To Chong, K. Mitigation of DC Components Using Adaptive BP-PID Control in Transformless Three-Phase Grid-Connected Inverters. Energies 2018, 11, 2047.

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