Quantitative Comparison and Analysis of Different Power Routing Methods for Single-Phase Cascaded H-Bridge Photovoltaic Grid-Connected Inverter

被引：20

作者：

Yang, Siwei ^{[1
]}

Zhang, Xing ^{[1
]}

Mao, Wang ^{[2
]}

Hu, Yuhua ^{[1
]}

Wang, Mingda ^{[1
]}

Wang, Fusheng ^{[1
]}

Cao, Renxian ^{[3
]}

机构：

[1] Hefei Univ Technol, Sch Elect Engn & Automat, Hefei 230009, Peoples R China

[2] Shanghai Inst Space Power Sources, Shanghai 200245, Peoples R China

[3] Sungrow Power Supply Co Ltd, Hefei 230088, Peoples R China

来源：

IEEE TRANSACTIONS ON POWER ELECTRONICS | 2021年 / 36卷 / 04期

基金：

国家重点研发计划;

关键词：

Routing; Inverters; Voltage control; Power generation; Pulse width modulation; Reactive power; Cascaded H-bridge (CHB); photovoltaic (PV) inverter; power routing methods; quantitative comparison; MULTILEVEL CONVERTERS; BALANCE CONTROL; STRATEGY; VOLTAGE;

D O I：

10.1109/TPEL.2020.3024282

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The output power of each photovoltaic (PV) module is different in the single-phase cascaded H-bridge (CHB) PV grid-connected inverter due to irradiance intensity, ambient temperature, and aging degree of PV modules. When the PV modules are operating at their respective maximum power points, the corresponding dc-side voltages of the H-bridge units drift due to uneven power distribution, which will cause the maximum power point tracking failure. As a result, the grid current will deteriorate and even the system will become unstable. The power routing control methods based on fundamental voltage reconstruction, third harmonic injection and hybrid pulse width modulation can realize unequal power distribution between H-bridges to ensure the system stable operation. This article summarizes the abovementioned typical power routing control methods, derives the expressions of power routing ranges of different methods, then comprehensively and deeply compares the power routing capabilities of various methods qualitatively and quantitatively. The simulation results of a single-phase seven-level CHB PV grid-connected inverter demonstrate the validity of the theoretical analyses.

引用

页码：4134 / 4152

页数：19

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