Article(id=1154040961328992924, tenantId=1146029695717560320, journalId=1146031654075715584, issueId=1154040955071095059, articleNumber=null, orderNo=null, doi=10.13234/j.issn.2095-2805.2024.1.74, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1610467200000, receivedDateStr=2021-01-13, revisedDate=1614441600000, revisedDateStr=2021-02-28, acceptedDate=1617033600000, acceptedDateStr=2021-03-30, onlineDate=1753074406224, onlineDateStr=2025-07-21, pubDate=1706544000000, pubDateStr=2024-01-30, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1753074406224, onlineIssueDateStr=2025-07-21, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1753074406224, creator=13701087609, updateTime=1753074406224, updator=13701087609, issue=Issue{id=1154040955071095059, tenantId=1146029695717560320, journalId=1146031654075715584, year='2024', volume='22', issue='1', pageStart='1', pageEnd='235', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=0, createTime=1753074404733, creator=13701087609, updateTime=1753781011721, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1157004679654760494, tenantId=1146029695717560320, journalId=1146031654075715584, issueId=1154040955071095059, language=EN, specialIssueTitle=, coverIllustrator=, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1157004679654760495, tenantId=1146029695717560320, journalId=1146031654075715584, issueId=1154040955071095059, language=CN, specialIssueTitle=, coverIllustrator=, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=74, endPage=82, ext={EN=ArticleExt(id=1154040962352403101, articleId=1154040961328992924, tenantId=1146029695717560320, journalId=1146031654075715584, language=EN, title=Improved Hybrid Modulation Strategy for MMC with Auxiliary Sub-modules, columnId=1153024091842924578, journalTitle=Journal of Power Supply, columnName=AC-DC Converters, runingTitle=null, highlight=null, articleAbstract=
The traditional nearest level modulation (NLM) has advantages of simple control and low switching frequency. However, when the number of output levels is small, the harmonic distortion rate of output waveform from a modular multilevel converter(MMC) under the NLM modulation will be large. In this paper, a full-bridge auxiliary sub-module is added to each arm of the traditional three-phase six-leg MMC topology, and the capacitance voltage of the auxiliary sub-module is half of that of the half-bridge sub-module. Aimed at this MMC topology, an improved hybrid modulation strategy is proposed, which can realize the balance control of half-bridge and auxiliary sub-module, reduce the harmonic distortion rate of MMC AC-side output current, and reduce the switching frequency and system loss of the full-bridge sub-module. A detailed simulation model is built in MATLAB/Simulink, and simulation results verify the effectiveness of the proposed MMC topology and the improved hybrid modulation strategy.
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传统的最近电平逼近调制 NLM(nearest level modulation)具有控制简单,开关频率低的显著优势,但在输出电平数较少时,采用NLM调制的模块化多电平换流器 MMC (modular multilevel converter)输出波形谐波畸变率较大。在传统三相六桥臂 MMC拓扑的各桥臂中增加1个全桥结构的辅助子模块,控制该辅助子模块的电容电压为半桥子模块的一半。针对该 MMC拓扑,提出了一种改进的混合调制策略,该混合调制策略可以实现半桥和辅助子模块的平衡控制。在降低MMC 交流侧输出电流的谐波畸变率同时,还可以降低全桥子模块的开关频率和系统损耗。在Matlab/Simulink 中搭建了详细的仿真模型,仿真结果验证了所提MMC 拓扑和改进混合调制策略的有效性。
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 |
杨光源(1986-),男,博士,工程师。研究方向:高压直流输电系统的运行、检修、调试和研究。E-mail:kkyanggy@126.com。 |
周诗嘉(1993-),女,通信作者,博士研究生。研究方向:新能源发电。E-mail:zhou_shijia@163.com。
彭光强(1987-),男,博士,工程师。研究方向:高压直流输电控制与保护。E-mail:pengguang_qiang@163.com。
武霁阳(1987-),男,博士,工程师。研究方向:高压直流输电系统控制保护。E-mail:wujy0451@163.com。
辛清明(1986-),男,博士,高级工程师。研究方向:直流输电技术。E-mail:xinqm@csg.cn。
许树楷(1978-),男,博士,教授级高级工程师。研究方向:直流输电技术。E-mail:xusk@csg.cn。
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1 中国南方电网超高压输电公司 检修试验中心 广州 510663)]), AuthorCompany(id=1154041034486043022, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, xref=2, ext=[AuthorCompanyExt(id=1154041034494431631, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, companyId=1154041034486043022, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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2 中国南方电网科学研究院有限责任公司 广州 510080)])], figs=[ArticleFig(id=1154041038361579994, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=EN, label=Fig. 1, caption=
Topology of improved MMC, figureFileSmall=TyqvzZtveuIrgF3pxit3RA==, figureFileBig=2dl6+N2cU5rU+HjYhLmeWg==, tableContent=null), ArticleFig(id=1154041038428688860, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=CN, label=图1, caption=
改进型 MMC 拓扑结构, figureFileSmall=TyqvzZtveuIrgF3pxit3RA==, figureFileBig=2dl6+N2cU5rU+HjYhLmeWg==, tableContent=null), ArticleFig(id=1154041038491603422, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=EN, label=Fig. 2, caption=
Topology of single-phase improved MMC, figureFileSmall=PAgJnvQdae+MDUP4kTXE2g==, figureFileBig=3Ke2p1xYBFIWMqeg0nDZIg==, tableContent=null), ArticleFig(id=1154041038541935072, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=CN, label=图2, caption=
单相改进 MMC 拓扑, figureFileSmall=PAgJnvQdae+MDUP4kTXE2g==, figureFileBig=3Ke2p1xYBFIWMqeg0nDZIg==, tableContent=null), ArticleFig(id=1154041038630015458, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=EN, label=Fig. 3, caption=
Flow chart of NLM modulation, figureFileSmall=SMGJOGTVEUrEdM3bvcXx7g==, figureFileBig=7nZ/Cv2W/rzg/iU1l1/qtg==, tableContent=null), ArticleFig(id=1154041038722290148, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=CN, label=图3, caption=
NLM 调制流程, figureFileSmall=SMGJOGTVEUrEdM3bvcXx7g==, figureFileBig=7nZ/Cv2W/rzg/iU1l1/qtg==, tableContent=null), ArticleFig(id=1154041038764233189, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=EN, label=Fig. 4, caption=
Topology of improved MMC under balance control, figureFileSmall=osg85/063wXCp0Yss0kGIQ==, figureFileBig=GtZ89FpwMOcX3vMmBeAqyA==, tableContent=null), ArticleFig(id=1154041038881673703, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=CN, label=图4, caption=
改进型 MMC 拓扑平衡控制, figureFileSmall=osg85/063wXCp0Yss0kGIQ==, figureFileBig=GtZ89FpwMOcX3vMmBeAqyA==, tableContent=null), ArticleFig(id=1154041038927811049, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=EN, label=Fig. 5, caption=
Block diagram of $1/2$ auxiliary sub-module modulation signal generation, figureFileSmall=dxwOQmuoS60oWSQ9Amyfgw==, figureFileBig=Qe9p1/B8VxQI1Z69JbtyWA==, tableContent=null), ArticleFig(id=1154041038986531307, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=CN, label=图5, caption=
1/2 辅助子模块调制信号生成框图, figureFileSmall=dxwOQmuoS60oWSQ9Amyfgw==, figureFileBig=Qe9p1/B8VxQI1Z69JbtyWA==, tableContent=null), ArticleFig(id=1154041039049445869, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=EN, label=Fig. 6, caption=
Improved theoretical diagram of sum of front and rear half bridge and full bridge switch signals, figureFileSmall=qJJwU9kevGFehIHVAUyjEg==, figureFileBig=G9bp6gwk3AQWr/030qA5cg==, tableContent=null), ArticleFig(id=1154041039099777519, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=CN, label=图6, caption=
改进前后半桥和全桥开关信号之和理论, figureFileSmall=qJJwU9kevGFehIHVAUyjEg==, figureFileBig=G9bp6gwk3AQWr/030qA5cg==, tableContent=null), ArticleFig(id=1154041039179469297, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=EN, label=Fig. 7, caption=
Output current THD and average switching frequency of full-bridge sub-module under different operation time of full-bridge, figureFileSmall=fTqh8yeFEGpAHt2yZgMgFQ==, figureFileBig=A4yD1NHwsL9MkH9eP601wQ==, tableContent=null), ArticleFig(id=1154041039233995251, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=CN, label=图7, caption=
全桥不同投入时间下输出电流 THD 和全桥器件的平均开关频率, figureFileSmall=fTqh8yeFEGpAHt2yZgMgFQ==, figureFileBig=A4yD1NHwsL9MkH9eP601wQ==, tableContent=null), ArticleFig(id=1154041039284326901, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=EN, label=Fig. 8, caption=
Simulation results under traditional NLM modulation, figureFileSmall=qf4iDX4EKayLAYJrfaBzkg==, figureFileBig=KNKTDwhdf2oMoxNgnU7xBA==, tableContent=null), ArticleFig(id=1154041039343047158, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=CN, label=图8, caption=
传统 NLM 调制仿真结果, figureFileSmall=qf4iDX4EKayLAYJrfaBzkg==, figureFileBig=KNKTDwhdf2oMoxNgnU7xBA==, tableContent=null), ArticleFig(id=1154041039405961719, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=EN, label=Fig. 9, caption=
Simulation results under improved hybrid modulation strategy, figureFileSmall=hS1sd+Rysuy2z29iiYc9zQ==, figureFileBig=e/Ar72rRGSvNxJhT1TIUsQ==, tableContent=null), ArticleFig(id=1154041039468876281, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=CN, label=图9, caption=
改进混合调制策略仿真结果, figureFileSmall=hS1sd+Rysuy2z29iiYc9zQ==, figureFileBig=e/Ar72rRGSvNxJhT1TIUsQ==, tableContent=null), ArticleFig(id=1154041039556956666, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=EN, label=Fig. 10, caption=
Simulation results before and after improved modulation strategy under variable load, figureFileSmall=1fQsjhF0rrRkvIyS/c/FOQ==, figureFileBig=1duJ72MfDV7rTPCNZDeDlw==, tableContent=null), ArticleFig(id=1154041039598899708, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=CN, label=图10, caption=
变负载情况下改进前后调制策略仿真结果, figureFileSmall=1fQsjhF0rrRkvIyS/c/FOQ==, figureFileBig=1duJ72MfDV7rTPCNZDeDlw==, tableContent=null), ArticleFig(id=1154041039674397181, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=EN, label=Tab. 1, caption=
Operation states of full-bridge sub-module, figureFileSmall=null, figureFileBig=null, tableContent=
| 模式 | ${\mathrm{T}}_{1}$ | ${\mathrm{T}}_{2}$ | ${\mathrm{T}}_{3}$ | ${\mathrm{T}}_{4}$ | ${i}_{\mathrm{{sm}}}$ | ${U}_{\mathrm{{sm}}}$ | 电容状态 |
| 1 | 1 | 0 | 0 | 1 | 0 | ${U}_{\mathrm{C}}^{\prime }$ | 投入充电 |
| 2 | 1 | 0 | 0 | 1 | <0 | ${U}_{\mathrm{C}}^{\prime }$ | 投入放电 |
| 3 | 0 | 1 | 1 | 0 | 0 | $-{U}_{\mathrm{C}}^{\prime }$ | 投入放电 |
| 4 | 0 | 1 | 1 | 0 | <0 | $-{U}_{\mathrm{C}}^{\prime }$ | 投入充电 |
| 5 | 1 | 1 | 0 | 0 | - | 0 | 切除 |
| 6 | 0 | 0 | 1 | 1 | - | 0 | 切除 |
| 闭锁 | 0 | 0 | 0 | 0 | - | - | - |
), ArticleFig(id=1154041039754088958, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=CN, label=表1, caption=
全桥子模块工作状态, figureFileSmall=null, figureFileBig=null, tableContent=
| 模式 | ${\mathrm{T}}_{1}$ | ${\mathrm{T}}_{2}$ | ${\mathrm{T}}_{3}$ | ${\mathrm{T}}_{4}$ | ${i}_{\mathrm{{sm}}}$ | ${U}_{\mathrm{{sm}}}$ | 电容状态 |
| 1 | 1 | 0 | 0 | 1 | 0 | ${U}_{\mathrm{C}}^{\prime }$ | 投入充电 |
| 2 | 1 | 0 | 0 | 1 | <0 | ${U}_{\mathrm{C}}^{\prime }$ | 投入放电 |
| 3 | 0 | 1 | 1 | 0 | 0 | $-{U}_{\mathrm{C}}^{\prime }$ | 投入放电 |
| 4 | 0 | 1 | 1 | 0 | <0 | $-{U}_{\mathrm{C}}^{\prime }$ | 投入充电 |
| 5 | 1 | 1 | 0 | 0 | - | 0 | 切除 |
| 6 | 0 | 0 | 1 | 1 | - | 0 | 切除 |
| 闭锁 | 0 | 0 | 0 | 0 | - | - | - |
), ArticleFig(id=1154041039812809215, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=EN, label=Tab. 2, caption=
Output status of $1/2$ auxiliary sub-module, figureFileSmall=null, figureFileBig=null, tableContent=
| $t$ | 1/2 辅助子模块 | 半桥子模块 |
| 0 | 0 | 0 |
| 0~1/2 | PWM | 0 |
| $1/2 \sim 1$ | -PWM | 1 |
), ArticleFig(id=1154041039875723776, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=CN, label=表2, caption=
1/2 辅助子模块的输出状态, figureFileSmall=null, figureFileBig=null, tableContent=
| $t$ | 1/2 辅助子模块 | 半桥子模块 |
| 0 | 0 | 0 |
| 0~1/2 | PWM | 0 |
| $1/2 \sim 1$ | -PWM | 1 |
), ArticleFig(id=1154041039938638337, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=EN, label=Tab. 3, caption=
Simulation parameters, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 数值 |
| 桥臂半桥子模块数量/个 | 8 |
| 半桥子模块电容电压/kV | 1.6 |
| 桥臂 1/2 辅助子模块数量/个 | 1 |
| 1/2 辅助子模块电容电压$/\mathrm{{kV}}$ | 0.8 |
| 子模块电容/mF | 6 |
| 直流侧电压/kV | 12.8 |
| 电压调制度 | 0.8 |
| 额定容量/MW | 2 |
| 桥臂电感/mH | 6 |
| 控制频率/kHz | 10 |
| 载波频率/kHz | 10 |
), ArticleFig(id=1154041039988969986, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154040961328992924, language=CN, label=表3, caption=
仿真参数, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 数值 |
| 桥臂半桥子模块数量/个 | 8 |
| 半桥子模块电容电压/kV | 1.6 |
| 桥臂 1/2 辅助子模块数量/个 | 1 |
| 1/2 辅助子模块电容电压$/\mathrm{{kV}}$ | 0.8 |
| 子模块电容/mF | 6 |
| 直流侧电压/kV | 12.8 |
| 电压调制度 | 0.8 |
| 额定容量/MW | 2 |
| 桥臂电感/mH | 6 |
| 控制频率/kHz | 10 |
| 载波频率/kHz | 10 |
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