A Modular Three-Phase Photovoltaic Inverter with Elimination of Phase Unbalance and Reduction of Second Harmonic Voltage Ripple

Dang, Xinghua; Pan, Shangzhi; Pan, Xingyuan; Gao, Weifeng; Ding, Kai; Li, Wei

doi:10.1109/iecon43393.2020.9254344

Cited by 8 publications

(1 citation statement)

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“…In addition to distributed PV power generation systems, this topology has also been applied to unified power quality conditioner (UPQC) [17], motor drives [18], and electric vehicle charging stations [19]. In addition, there is also a scheme to replace the QAB with a four-port LLC converter, and its working principle is similar to the original scheme [20,21], as shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

An AC Voltage Balancer and its Improved Modulation Strategy for CHB Based PV Inverters

Jiang,

Zhao,

Yang

et al. 2023

IEEE Open J. Power Electron.

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Cascaded H-bridge (CHB) inverters have been widely used in distributed photovoltaic (PV) power generation systems due to their attractive features in terms of power quality and easy to expand compared to two-level or three-level inverters. Especially the modular inverters with an interphase structure composed of four-port isolated DC/DC converters and CHB inverters are preferred by academia and industry because it can naturally balance the power difference between phases. However, such modular inverters still suffer from some issues that need to be addressed, such as power mismatch between modules within the same phase. This will lead to overmodulation of some Hbridge inverter units and grid-connected current distortion, and even threaten the safe and stable operation of the entire modular inverter. In view of this problem, an AC voltage balancer (ACVB) is proposed in this paper to achieve power balance between adjacent H-bridge inverter units. Furthermore, an improved modulation strategy is also presented to achieve soft switching of ACVB. Finally, the effectiveness of the proposed ACVB and its improved modulation strategy is verified by experimental results. 1

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