NDLI: Balancing control of neutral-point voltage for three-level T-type inverter based on hybrid variable virtual space vector

Content Provider	IET Digital Library
Author	Zhou, Jiancheng Cheng, Shanmei Hu, Zhenyu Liu, Jiang
Abstract	A three-level T-type inverter has higher efficiency and lower output voltage harmonics compared with the traditional two-level inverter. However, neutral-point voltage fluctuation and common-mode voltage (CMV) can negatively affect the performance of the three-level T-type inverter. This study proposes a novel hybrid variable virtual space vector (HV2SV) strategy to mitigate this problem. Based on the virtual space vector scheme, new variable virtual small and medium vectors are reconstructed with the principle that the change of neutral-point charge of each virtual vector in a switching period is zero, and the adjustment factor is further added to the virtual vector to achieve the balance of the neutral-point voltage. At the same time, the vectors with a large CMV are eliminated to ensure that the CMV is minimised. Therefore, the HV2SV has excellent neutral-point voltage balance control capability and common-voltage suppression at both high- and low-modulation ratios. Theoretical analysis, simulations, and experimental results demonstrate the effectiveness and feasibility of the proposed strategy for full modulation ratios.
Starting Page	744
Ending Page	750
Page Count	7
ISSN	17554535
Volume Number	13
e-ISSN	17554543
Issue Number	Issue 4, Mar (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/13/4
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2019.0759
Journal	IET Power Electronics
Publisher Date	2019-11-13
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	CMV Common-mode Voltage Common-voltage Suppression Control of Electric Power System Hybrid Variable Virtual Space Vector Lower Output Voltage Harmonics Medium Vector Neutral-point Charge Neutral-point Voltage Balance Control Capability Neutral-point Voltage Fluctuation Power Converter Power Electronics Power Supplies to Apparatus Power Supply PWM Invertors Supervisory Circuit Switching Converter Three-level T-type Inverter Two-level Inverter Variable Virtual Small Vector Virtual Space Vector Scheme Virtual Vector Voltage Control
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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