Voltage-Sensorless Natural Frame Control for Single-Phase CHB Converter under Distorted Grid Conditions

Dashuai Shao, Jinbao Liu, Daliang Yang, Zuwen Peng and Zheng Li
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Dashuai Shao: Guangxi Key Laboratory of Power System Optimization and Energy Technology, Guangxi University, Nanning 530004, China
Jinbao Liu: College of Electrical Engineering, Guangxi University, Nanning 530004, China
Daliang Yang: Guangxi Key Laboratory of Power System Optimization and Energy Technology, Guangxi University, Nanning 530004, China
Zuwen Peng: College of Electrical Engineering, Guangxi University, Nanning 530004, China
Zheng Li: College of Electrical Engineering, Guangxi University, Nanning 530004, China

Energies, 2022, vol. 15, issue 3, 1-16

Abstract: In this paper, a control scheme combining grid voltage sensorless control and natural frame control (NFC) has been proposed for single-phase cascaded H-bridge converter (CHB) under distorted grid conditions. Firstly, the virtual flux (VF) signal is estimated by a modified virtual flux estimator (VFE). Then the VF-based NFC is derived, using the estimated sinusoidal VF signal to generate the unit vectors for synchronization, which enables the omitting of the coordinate transformation, current quadrature signal generation, and phase-locked loop (PLL). Aiming at the problem that grid harmonic interference is not well considered in the conventional NFC and conventional voltage sensorless control, a current controller with enhanced harmonic-rejection ability is proposed in this paper. As a result, better steady-state performance and rapid transient response are achieved. The effectiveness of the proposed method has been verified on a prototype of the single-phase 3-cell CHB converter.

Keywords: cascaded H-bridge; distorted grid conditions; natural frame control; voltage sensorless control; virtual flux (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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