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The cascaded H-bridge is considered as one of the most suitable topologies for photovoltaic (PV) power generation. Aimed at the problems of the traditional three-phase cascaded H-bridge PV inverter such as a large capacitor volume, a short service life, inter-phase power mismatch and a complex control communication system, a novel modular three-phase PV inverter and its distributed control strategy are proposed based on the principle of magnetic flux cancellation. First, the basic structure of the proposed modular topology is introduced. Then, the basic principle of magnetic flux cancellation power decoupling and the influencing factors of double-line frequency voltage ripple are analyzed in detail, and a distributed control strategy is proposed to suppress the double-line frequency voltage ripple and ensure the balance of three-phase output power. Finally, the correctness of theoretical analysis and the feasibility of the proposed control strategy were verified by simulation and experimental results.
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级联H桥被认为是最适合光伏发电场景的拓扑之一。针对传统三相级联H桥光伏逆变器电容体积大、寿命短、相间功率失配及控制通信系统复杂的问题,基于磁通抵消原理提出1种新型模块化三相光伏逆变器及其分布式控制策略。首先,介绍了模块化拓扑的基本结构;然后,对磁通抵消功率解耦的基本原理及二倍频电压纹波的影响因素进行了详细分析,提出1种分布式控制策略以实现二倍频电压纹波的抑制并保证三相输出功率平衡;最后,通过仿真与实验验证了分析的正确性与控制策略的可行性。
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 |
党兴华(1997-),男,硕士研究生。研究方向:多端口变换器、级联变换器在光伏发电中的应用。E-mail: xinghua.dang@whu.edu.cn。 |
潘尚智(1976-),男,中国电源学会高级会员,通信作者,博士,教授。研究方向:功率变换器数字控制、高功率密度高效率电源、分布式太阳能发电、分布式直流微电网技术。E-mail: shangzhi.pan@whu.edu.cn。
葛晓露(1999-),女,硕士研究生。研究方向:级联变换器的分布式控制。E-mail: xiaolu.ge@whu.edu.cn。
宫金武(1981-),男,博士,副教授。研究方向:高效率高功率密度电力电子变流器设计、宽禁带半导体器件应用。E-mail:gongjinwu@whu.edu.cn。
郝利东(1987-),男,中国电源学会会员,博士研究生。研究方向:多端口变换器、级联变换器在电机驱动中的应用。E-mail:haold@whu.edu.cn。
查晓明(1967-),男,博士,教授。研究方向:大功率电力电子装置及其在电能质量控制、高压电机驱动、柔性输电、新能源及微电网技术中的应用。E-mail: xmzha@whu.edu.cn。
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党兴华(1997-),男,硕士研究生。研究方向:多端口变换器、级联变换器在光伏发电中的应用。E-mail: xinghua.dang@whu.edu.cn。
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党兴华(1997-),男,硕士研究生。研究方向:多端口变换器、级联变换器在光伏发电中的应用。E-mail: xinghua.dang@whu.edu.cn。
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潘尚智(1976-),男,中国电源学会高级会员,通信作者,博士,教授。研究方向:功率变换器数字控制、高功率密度高效率电源、分布式太阳能发电、分布式直流微电网技术。E-mail: shangzhi.pan@whu.edu.cn。
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潘尚智(1976-),男,中国电源学会高级会员,通信作者,博士,教授。研究方向:功率变换器数字控制、高功率密度高效率电源、分布式太阳能发电、分布式直流微电网技术。E-mail: shangzhi.pan@whu.edu.cn。
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葛晓露(1999-),女,硕士研究生。研究方向:级联变换器的分布式控制。E-mail: xiaolu.ge@whu.edu.cn。
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葛晓露(1999-),女,硕士研究生。研究方向:级联变换器的分布式控制。E-mail: xiaolu.ge@whu.edu.cn。
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宫金武(1981-),男,博士,副教授。研究方向:高效率高功率密度电力电子变流器设计、宽禁带半导体器件应用。E-mail:gongjinwu@whu.edu.cn。
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宫金武(1981-),男,博士,副教授。研究方向:高效率高功率密度电力电子变流器设计、宽禁带半导体器件应用。E-mail:gongjinwu@whu.edu.cn。
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郝利东(1987-),男,中国电源学会会员,博士研究生。研究方向:多端口变换器、级联变换器在电机驱动中的应用。E-mail:haold@whu.edu.cn。
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郝利东(1987-),男,中国电源学会会员,博士研究生。研究方向:多端口变换器、级联变换器在电机驱动中的应用。E-mail:haold@whu.edu.cn。
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查晓明(1967-),男,博士,教授。研究方向:大功率电力电子装置及其在电能质量控制、高压电机驱动、柔性输电、新能源及微电网技术中的应用。E-mail: xmzha@whu.edu.cn。
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查晓明(1967-),男,博士,教授。研究方向:大功率电力电子装置及其在电能质量控制、高压电机驱动、柔性输电、新能源及微电网技术中的应用。E-mail: xmzha@whu.edu.cn。
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Topology of single module unit, figureFileSmall=kGQ8AtUbbE9yNdt3OdKXhg==, figureFileBig=r7BgWApPplXngDBDG1ISmA==, tableContent=null), ArticleFig(id=1154032490504250135, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=CN, label=图1, caption=
单个模块单元拓扑, figureFileSmall=kGQ8AtUbbE9yNdt3OdKXhg==, figureFileBig=r7BgWApPplXngDBDG1ISmA==, tableContent=null), ArticleFig(id=1154032490567164698, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=EN, label=Fig. 2, caption=
Schematic of secondary port of QAB converter, figureFileSmall=suS9Cn7oXFKflV38JNK+Ug==, figureFileBig=oOtun1nPtaFri1TC6cRlBA==, tableContent=null), ArticleFig(id=1154032490634273565, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=CN, label=图2, caption=
前级 QAB 变换器二次侧端口示意, figureFileSmall=suS9Cn7oXFKflV38JNK+Ug==, figureFileBig=oOtun1nPtaFri1TC6cRlBA==, tableContent=null), ArticleFig(id=1154032490697188126, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=EN, label=Fig. 3, caption=
Y-type equivalent circuit of transformer secondary winding, figureFileSmall=6fffP0U2xp0NfB9TB0FHyQ==, figureFileBig=s9VXqMVZFe1LB9gN7WNkyQ==, tableContent=null), ArticleFig(id=1154032490755908384, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=CN, label=图3, caption=
变压器二次侧绕组的 “ $\mathrm{Y}$ ” 形等效电路, figureFileSmall=6fffP0U2xp0NfB9TB0FHyQ==, figureFileBig=s9VXqMVZFe1LB9gN7WNkyQ==, tableContent=null), ArticleFig(id=1154032490831405860, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=EN, label=Fig. 4, caption=
Equivalent circuit model of QAB converter, figureFileSmall=p8gk1xm+z8HzPvYHl5nhHA==, figureFileBig=UjANN6rKqdhEov3pNn+1Lw==, tableContent=null), ArticleFig(id=1154032490919486246, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=CN, label=图4, caption=
QAB 的等效电路模型, figureFileSmall=p8gk1xm+z8HzPvYHl5nhHA==, figureFileBig=UjANN6rKqdhEov3pNn+1Lw==, tableContent=null), ArticleFig(id=1154032490999178025, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=EN, label=Fig. 5, caption=
Numerical solution of Eq.(33) under the condition listed in Tab. 1, figureFileSmall=wmGCI4hbUCpYjNSjAAg2LA==, figureFileBig=1WlMIQSNyYrZAZmRWPjuXA==, tableContent=null), ArticleFig(id=1154032491099841326, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=CN, label=图5, caption=
式(33)在表1 条件下的数值解, figureFileSmall=wmGCI4hbUCpYjNSjAAg2LA==, figureFileBig=1WlMIQSNyYrZAZmRWPjuXA==, tableContent=null), ArticleFig(id=1154032491183727409, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=EN, label=Fig. 6, caption=
Control block diagram of system, figureFileSmall=qOSREJIP52wMYVy/mifY/w==, figureFileBig=Aw9hb7yH6q7SHVw9poWMuw==, tableContent=null), ArticleFig(id=1154032491255030580, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=CN, label=图6, caption=
系统控制框图, figureFileSmall=qOSREJIP52wMYVy/mifY/w==, figureFileBig=Aw9hb7yH6q7SHVw9poWMuw==, tableContent=null), ArticleFig(id=1154032491330528055, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=EN, label=Fig. 7, caption=
Simulation waveforms of DC-link capacitor voltage under different parameters, figureFileSmall=15Vz3MTVvL1XjU5mP2EdpA==, figureFileBig=4F4sf66ucGyBVQdODlZ9+g==, tableContent=null), ArticleFig(id=1154032491385054010, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=CN, label=图7, caption=
直流侧电容电压在不同参数下的仿真波形, figureFileSmall=15Vz3MTVvL1XjU5mP2EdpA==, figureFileBig=4F4sf66ucGyBVQdODlZ9+g==, tableContent=null), ArticleFig(id=1154032491460551485, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=EN, label=Fig. 8, caption=
Simulation waveforms of DC-link capacitor voltage before and after using the proposed control strategy, figureFileSmall=3xwbm+8JabiSSz+eTYKiZw==, figureFileBig=8F0WdfnQJVuMgzAnF1pegA==, tableContent=null), ArticleFig(id=1154032491544437568, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=CN, label=图8, caption=
采用所提控制策略前后直流侧电容电压的仿真波形, figureFileSmall=3xwbm+8JabiSSz+eTYKiZw==, figureFileBig=8F0WdfnQJVuMgzAnF1pegA==, tableContent=null), ArticleFig(id=1154032491607352130, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=EN, label=Fig. 9, caption=
Experimental platform, figureFileSmall=M8CNo01gCO0Xfdc23iOhPA==, figureFileBig=Vp8FvA1aC/gVR5c95Ib01w==, tableContent=null), ArticleFig(id=1154032491682849605, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=CN, label=图9, caption=
实验平台, figureFileSmall=M8CNo01gCO0Xfdc23iOhPA==, figureFileBig=Vp8FvA1aC/gVR5c95Ib01w==, tableContent=null), ArticleFig(id=1154032491754152776, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=EN, label=Fig. 10, caption=
Experimental waveforms of DC-link capacitor voltage (without the proposed control strategy), figureFileSmall=7xz5WyBFMboMWmKG8TnvQA==, figureFileBig=sLJT242BU3vq8CmjS5kqwQ==, tableContent=null), ArticleFig(id=1154032491833844555, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=CN, label=图10, caption=
直流侧电容电压实验波形(未施加所提控制策略), figureFileSmall=7xz5WyBFMboMWmKG8TnvQA==, figureFileBig=sLJT242BU3vq8CmjS5kqwQ==, tableContent=null), ArticleFig(id=1154032491892564811, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=EN, label=Fig. 11, caption=
Experimental waveforms of DC-link capacitor voltage (with the proposed control strategy), figureFileSmall=o8yu7a7IxK2thjQ+9D4GTQ==, figureFileBig=3v6HOiLKPufbbRHMDpqZTA==, tableContent=null), ArticleFig(id=1154032491959673676, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=CN, label=图11, caption=
直流侧电容电压实验波形(施加所提控制策略), figureFileSmall=o8yu7a7IxK2thjQ+9D4GTQ==, figureFileBig=3v6HOiLKPufbbRHMDpqZTA==, tableContent=null), ArticleFig(id=1154032492051948366, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=EN, label=Fig. 12, caption=
Experimental waveforms of three-phase output current, figureFileSmall=d2J4L5FbqYHIKsSAVwhfBw==, figureFileBig=hYfMGffLhhoJRm+DnIjnQA==, tableContent=null), ArticleFig(id=1154032492140028752, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=CN, label=图12, caption=
三相输出电流实验波形, figureFileSmall=d2J4L5FbqYHIKsSAVwhfBw==, figureFileBig=hYfMGffLhhoJRm+DnIjnQA==, tableContent=null), ArticleFig(id=1154032492211331922, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=EN, label=Fig. 13, caption=
Comparison of volume, loss and cost between the proposed topology and traditional topology, figureFileSmall=mYU49qfIV/hq8aYXjF3ZKw==, figureFileBig=0v8hdjLxWpPQ4/5oEnliFw==, tableContent=null), ArticleFig(id=1154032492265857876, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=CN, label=图13, caption=
所提拓扑与传统拓扑体积、损耗、成本对比, figureFileSmall=mYU49qfIV/hq8aYXjF3ZKw==, figureFileBig=0v8hdjLxWpPQ4/5oEnliFw==, tableContent=null), ArticleFig(id=1154032492337161047, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=EN, label=Tab. 1, caption=
Numerical calculation parameters, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 数值 |
| 子模块总传输功率$P/\mathrm{W}$ | 300 |
| 输入端电压${V}_{\mathrm{P}}/\mathrm{V}$ | 40 |
| 直流侧电容电压${V}_{\mathrm{{DC}}}/\mathrm{V}$ | 40 |
| QAB 变换器开关频率${f}_{1}/\mathrm{{kHz}}$ | 200 |
| QAB 一次侧辅助电感${L}_{\mathrm{p}}/\mu \mathrm{H}$ | 2.5 |
| QAB二次侧漏电感$L/\mu \mathrm{H}$ | 1 |
| 逆变器输出频率$f/\mathrm{{Hz}}$ | 50 |
| 四绕组变压器变比${N}_{\mathrm{p}}: {N}_{\mathrm{a}}: {N}_{\mathrm{b}}: {N}_{\mathrm{c}}$ | $1 : 1 : 1 : 1$ |
), ArticleFig(id=1154032492429435738, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=CN, label=表1, caption=
数值计算参数, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 数值 |
| 子模块总传输功率$P/\mathrm{W}$ | 300 |
| 输入端电压${V}_{\mathrm{P}}/\mathrm{V}$ | 40 |
| 直流侧电容电压${V}_{\mathrm{{DC}}}/\mathrm{V}$ | 40 |
| QAB 变换器开关频率${f}_{1}/\mathrm{{kHz}}$ | 200 |
| QAB 一次侧辅助电感${L}_{\mathrm{p}}/\mu \mathrm{H}$ | 2.5 |
| QAB二次侧漏电感$L/\mu \mathrm{H}$ | 1 |
| 逆变器输出频率$f/\mathrm{{Hz}}$ | 50 |
| 四绕组变压器变比${N}_{\mathrm{p}}: {N}_{\mathrm{a}}: {N}_{\mathrm{b}}: {N}_{\mathrm{c}}$ | $1 : 1 : 1 : 1$ |
), ArticleFig(id=1154032492496544604, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=EN, label=Tab. 2, caption=
Simulation parameters, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 数值 |
| 子模块总传输功率$P/\mathrm{W}$ | 300 |
| 输入端电压${V}_{\mathrm{P}}/\mathrm{V}$ | 40 |
| 直流侧电容电压${V}_{\mathrm{{DC}}}/\mathrm{V}$ | 40 |
| QAB 变换器开关频率${f}_{1}/\mathrm{{kHz}}$ | 200 |
| QAB 一次侧辅助电感${L}_{\mathrm{p}}/\mu \mathrm{H}$ | 2.5 |
| 逆变器输出基波频率$f/\mathrm{{Hz}}$ | 50 |
| 四绕组变压器变比${N}_{\mathrm{p}}: {N}_{\mathrm{a}}: {N}_{\mathrm{b}}: {N}_{\mathrm{c}}$ | $1 : 1 : 1 : 1$ |
| 级联模块数量$N$ | 3 |
| 输入端电容${C}_{\mathrm{p}}/\mu \mathrm{F}$ | 10 |
| 直流侧电容${C}_{{C}_{x}}\left({x =\mathrm{a},\mathrm{b},\mathrm{c}}\right)/\mu \mathrm{F}$ | 20 |
| 电网电压幅值${V}_{\text{Grid }}/\mathrm{V}$ | 100 |
), ArticleFig(id=1154032492576236382, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=CN, label=表2, caption=
仿真参数, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 数值 |
| 子模块总传输功率$P/\mathrm{W}$ | 300 |
| 输入端电压${V}_{\mathrm{P}}/\mathrm{V}$ | 40 |
| 直流侧电容电压${V}_{\mathrm{{DC}}}/\mathrm{V}$ | 40 |
| QAB 变换器开关频率${f}_{1}/\mathrm{{kHz}}$ | 200 |
| QAB 一次侧辅助电感${L}_{\mathrm{p}}/\mu \mathrm{H}$ | 2.5 |
| 逆变器输出基波频率$f/\mathrm{{Hz}}$ | 50 |
| 四绕组变压器变比${N}_{\mathrm{p}}: {N}_{\mathrm{a}}: {N}_{\mathrm{b}}: {N}_{\mathrm{c}}$ | $1 : 1 : 1 : 1$ |
| 级联模块数量$N$ | 3 |
| 输入端电容${C}_{\mathrm{p}}/\mu \mathrm{F}$ | 10 |
| 直流侧电容${C}_{{C}_{x}}\left({x =\mathrm{a},\mathrm{b},\mathrm{c}}\right)/\mu \mathrm{F}$ | 20 |
| 电网电压幅值${V}_{\text{Grid }}/\mathrm{V}$ | 100 |
), ArticleFig(id=1154032492655928161, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=EN, label=Tab. 3, caption=
Reference components and quantity, figureFileSmall=null, figureFileBig=null, tableContent=
| 元器件 | 本文所提拓扑子模块 | 传统拓扑子模块 |
| 变压器 一次侧 MOSFET | BSC070N10NS5ATMA1 (×4) | BSZ150N10LS3G (×12) |
| 变压器 二次侧 MOSFET | BSZ150N10LS3G (×24) | BSZ150N10LS3G (×24) |
| H 桥逆变器 直流侧电容 | 陶瓷电容${4.7\mu }\mathrm{F}\left({\times {18}}\right)$ (1206 封装) | 电解电容${470\mu }\mathrm{F}$ (×27)(直径 16 mm, 高度 25 mm) |
| 变压器 磁芯 | EE 32/6/20 (3F3 材料) | EE 22/6/16 (3F3 材料)(×3) |
), ArticleFig(id=1154032492723037027, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375934599123343, language=CN, label=表3, caption=
参考元器件及数量, figureFileSmall=null, figureFileBig=null, tableContent=
| 元器件 | 本文所提拓扑子模块 | 传统拓扑子模块 |
| 变压器 一次侧 MOSFET | BSC070N10NS5ATMA1 (×4) | BSZ150N10LS3G (×12) |
| 变压器 二次侧 MOSFET | BSZ150N10LS3G (×24) | BSZ150N10LS3G (×24) |
| H 桥逆变器 直流侧电容 | 陶瓷电容${4.7\mu }\mathrm{F}\left({\times {18}}\right)$ (1206 封装) | 电解电容${470\mu }\mathrm{F}$ (×27)(直径 16 mm, 高度 25 mm) |
| 变压器 磁芯 | EE 32/6/20 (3F3 材料) | EE 22/6/16 (3F3 材料)(×3) |
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