Article(id=1154038485439729737, tenantId=1146029695717560320, journalId=1146031654075715584, issueId=1154038481564197598, articleNumber=null, orderNo=null, doi=10.13234/j.issn.2095-2805.2024.2.167, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1621526400000, receivedDateStr=2021-05-21, revisedDate=1628784000000, revisedDateStr=2021-08-13, acceptedDate=1629993600000, acceptedDateStr=2021-08-27, onlineDate=1753073815926, onlineDateStr=2025-07-21, pubDate=1711728000000, pubDateStr=2024-03-30, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1753073815926, onlineIssueDateStr=2025-07-21, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1753073815926, creator=13701087609, updateTime=1753073815926, updator=13701087609, issue=Issue{id=1154038481564197598, tenantId=1146029695717560320, journalId=1146031654075715584, year='2024', volume='22', issue='2', pageStart='1', pageEnd='455', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=0, createTime=1753073815003, creator=13701087609, updateTime=1753780998609, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1157004624629683026, tenantId=1146029695717560320, journalId=1146031654075715584, issueId=1154038481564197598, language=EN, specialIssueTitle=, coverIllustrator=, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1157004624629683027, tenantId=1146029695717560320, journalId=1146031654075715584, issueId=1154038481564197598, language=CN, specialIssueTitle=, coverIllustrator=, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=167, endPage=174, ext={EN=ArticleExt(id=1154038486408613964, articleId=1154038485439729737, tenantId=1146029695717560320, journalId=1146031654075715584, language=EN, title=Research on Active Damping Control Strategy for LCL Inverter in Weak Grid, columnId=1152281492550987902, journalTitle=Journal of Power Supply, columnName=Renewable Energy System, runingTitle=null, highlight=null, articleAbstract=
In a weak grid, due to the existence of grid impedance, the natural resonant frequency of a new energy grid-connected LCL filter will shift, and the traditional active damping control strategy cannot guarantee the system stability. Moreover, as the proportion of new energy power generation in the power system continues to grow, how to reduce the operating costs is a hot topic for research. Therefore, a novel control strategy based on grid-connected current and common coupling voltage feedback is proposed in this paper, which not only provides active damping to suppress LCL resonance, but also reduces the use of sensors. In addition, it has a strong adaptability under wide-ranging changes in grid impedance. Simulation and experimental results show that, compared with that under the traditional control strategy, the practical range of weak grid under the improved strategy increases, the system stability is enhanced, and the capability to suppress harmonics is raised, indicating that the quality of grid-connected current is well improved.
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在弱电网中,由于电网阻抗的存在,会导致新能源并网 LCL滤波器固有谐振频率发生偏移,传统有源阻尼控制策略则无法保证系统的稳定性。而且随着新能源发电在电力系统中的占比不断提高,如何降低运营成本成为了研究热点。因此本文提出一种基于并网电流和公共耦合电压反馈的新型控制策略,该控制策略不仅提供了有源阻尼以抑制 LCL 谐振,而且减少了传感器的使用,还能对大范围变化的电网阻抗有较强的适应能力。通过仿真和实验表明,与传统的控制策略相比,在改进的策略下弱电网的实用范围增加,系统的稳定性得到提高,对谐波的抑制能力提升,并网电流质量有了良好的改善。
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 |
王翰文(1996-),男,硕士研究生。研究方向:微电网并网逆变器控制技术。E-mail: 976898554@qq.com。 |
曾成碧(1969-),女,博士,硕士生导师,教授。研究方向:新能源及智能优化控制等光伏发电技术。E-mail: 857606631@qq.com。
苗虹(1971-),女,通信作者,博士,副教授。研究方向:分布式发电和微电网技术等。E-mail:1604681549@qq.com。
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王翰文(1996-),男,硕士研究生。研究方向:微电网并网逆变器控制技术。E-mail: 976898554@qq.com。
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王翰文(1996-),男,硕士研究生。研究方向:微电网并网逆变器控制技术。E-mail: 976898554@qq.com。
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曾成碧(1969-),女,博士,硕士生导师,教授。研究方向:新能源及智能优化控制等光伏发电技术。E-mail: 857606631@qq.com。
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曾成碧(1969-),女,博士,硕士生导师,教授。研究方向:新能源及智能优化控制等光伏发电技术。E-mail: 857606631@qq.com。
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苗虹(1971-),女,通信作者,博士,副教授。研究方向:分布式发电和微电网技术等。E-mail:1604681549@qq.com。
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苗虹(1971-),女,通信作者,博士,副教授。研究方向:分布式发电和微电网技术等。E-mail:1604681549@qq.com。
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15(13): 92-102 (in Chinese)., articleTitle=Discrete Approximation of Fractional-order Differentiator Based on Tustin Transfo, refAbstract=null)], funds=[Fund(id=1154038649160192193, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, awardId=2018YFC1505502-03, language=EN, fundingSource=National Science and Technology Program(2018YFC1505502-03), fundOrder=null, country=null), Fund(id=1154038649223106756, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, awardId=2018YFC1505502-03, language=CN, fundingSource=国家重点研发资助项目(2018YFC1505502-03), fundOrder=null, country=null), Fund(id=1154038649286021319, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, awardId=2019-YF05-02107-SN, language=EN, fundingSource=Chengdu Science and Technology Program(2019-YF05-02107-SN), fundOrder=null, country=null), Fund(id=1154038649369907402, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, awardId=2019-YF05-02107-SN, language=CN, fundingSource=成都市科技局资助项目(2019-YF05-02107-SN), fundOrder=null, country=null), Fund(id=1154038649432821965, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, awardId=21ZDYF3753, language=EN, fundingSource=Sichuan Science and Technology Program(21ZDYF3753), fundOrder=null, country=null), Fund(id=1154038649487347919, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, awardId=21ZDYF3753, language=CN, fundingSource=四川省重点研发资助项目(21ZDYF3753), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1154038639920141177, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, xref=null, ext=[AuthorCompanyExt(id=1154038639924335482, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, companyId=1154038639920141177, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=School of Electrical Engineering Sichuan University Chengdu 610065 China), AuthorCompanyExt(id=1154038639932724091, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, companyId=1154038639920141177, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=四川大学 电气工程学院 成都 610065)])], figs=[ArticleFig(id=1154038646761050198, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=EN, label=Fig. 1, caption=
Topology of three-phase LCL grid-connected inverter, figureFileSmall=k7BCahx2DCM/fsiWJsnDBQ==, figureFileBig=0XOOCnuPwWKHw9sJbFMPMw==, tableContent=null), ArticleFig(id=1154038646823964762, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=CN, label=图1, caption=
三相 LCL 并网逆变器拓扑结构, figureFileSmall=k7BCahx2DCM/fsiWJsnDBQ==, figureFileBig=0XOOCnuPwWKHw9sJbFMPMw==, tableContent=null), ArticleFig(id=1154038646891073632, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=EN, label=Fig. 2, caption=
Block diagram of feedback control of grid-connected inverter, figureFileSmall=QOvANgNX4VJLmFLfM5uHpQ==, figureFileBig=gAEq7m3ouAKZrVGMK9Y4Wg==, tableContent=null), ArticleFig(id=1154038646953988195, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=CN, label=图2, caption=
并网逆变器的反馈控制框图, figureFileSmall=QOvANgNX4VJLmFLfM5uHpQ==, figureFileBig=gAEq7m3ouAKZrVGMK9Y4Wg==, tableContent=null), ArticleFig(id=1154038647004319846, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=EN, label=Fig. 3, caption=
Block diagram of control of system with HPF, figureFileSmall=g4haPgkVINOQLz6Z4sBShQ==, figureFileBig=30Rztok4UMo38DwRAN3kyw==, tableContent=null), ArticleFig(id=1154038647071428714, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=CN, label=图3, caption=
加入 HPF 后系统的控制框图, figureFileSmall=g4haPgkVINOQLz6Z4sBShQ==, figureFileBig=30Rztok4UMo38DwRAN3kyw==, tableContent=null), ArticleFig(id=1154038647117566062, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=EN, label=Fig. 4, caption=
Pole distribution under HPF strategy for grid-connected current with different grid impedances, figureFileSmall=wyrTXvKQzyuesyBkwtMX6A==, figureFileBig=piYGanBgKz8cZr5bGBpcOQ==, tableContent=null), ArticleFig(id=1154038647176286322, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=CN, label=图4, caption=
不同阻抗下并网电流 HPF 策略闭环极点分布, figureFileSmall=wyrTXvKQzyuesyBkwtMX6A==, figureFileBig=piYGanBgKz8cZr5bGBpcOQ==, tableContent=null), ArticleFig(id=1154038647255978099, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=EN, label=Fig. 5, caption=
Control block diagram of system after adding the improved control strategy, figureFileSmall=K74JT1ZCKe6ZdKgVPvNatQ==, figureFileBig=olmf3/vr6VoPmjO/QCW16g==, tableContent=null), ArticleFig(id=1154038647318892659, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=CN, label=图5, caption=
加入改进的控制策略后系统的控制框图, figureFileSmall=K74JT1ZCKe6ZdKgVPvNatQ==, figureFileBig=olmf3/vr6VoPmjO/QCW16g==, tableContent=null), ArticleFig(id=1154038647369224311, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=EN, label=Fig. 6, caption=
Bode diagram of system open-loop when, figureFileSmall=i6paOlouIgezw8yq7fxa4w==, figureFileBig=Lod363uHZY8ok0nXDGxJrg==, tableContent=null), ArticleFig(id=1154038647432138874, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=CN, label=图6, caption=
${k}_{2}$ 变化时系统开环伯德图, figureFileSmall=i6paOlouIgezw8yq7fxa4w==, figureFileBig=Lod363uHZY8ok0nXDGxJrg==, tableContent=null), ArticleFig(id=1154038647486664829, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=EN, label=Fig. 7, caption=
Bode diagram of system open-loop under improved control strategy, figureFileSmall=9M8spFT6YTNuVytz6vlTGw==, figureFileBig=erFoaMbc1CL9DaVNhPAmsA==, tableContent=null), ArticleFig(id=1154038647557968001, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=CN, label=图7, caption=
改进控制策略的系统开环伯德图, figureFileSmall=9M8spFT6YTNuVytz6vlTGw==, figureFileBig=erFoaMbc1CL9DaVNhPAmsA==, tableContent=null), ArticleFig(id=1154038647650242693, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=EN, label=Fig. 8, caption=
Closed-loop pole distribution under improved strategy with different electrical impedances, figureFileSmall=vbHjfiDvNf/sd2S2TWGCzA==, figureFileBig=pYxcnvnydKsK/jkuY75dcA==, tableContent=null), ArticleFig(id=1154038647725740168, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=CN, label=图8, caption=
不同电阻抗下改进策略闭环极点分布, figureFileSmall=vbHjfiDvNf/sd2S2TWGCzA==, figureFileBig=pYxcnvnydKsK/jkuY75dcA==, tableContent=null), ArticleFig(id=1154038647809626249, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=EN, label=Fig. 10, caption=
Distribution of dominant poles of system under the HPF control strategy, figureFileSmall=aAlieqa8bzCAYw0hwbuj9g==, figureFileBig=2Ux0L145St/RJaadNf4Prw==, tableContent=null), ArticleFig(id=1154038647872540810, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=CN, label=图10, caption=
采用 HPF 控制策略时系统主导极点分布, figureFileSmall=aAlieqa8bzCAYw0hwbuj9g==, figureFileBig=2Ux0L145St/RJaadNf4Prw==, tableContent=null), ArticleFig(id=1154038647922872461, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=EN, label=Fig. 11, caption=
Distribution of dominant poles under the improved control strategy, figureFileSmall=+Sb5T9gt0vwKo8rlpBqgpA==, figureFileBig=7aOs72Ax2rZ7R+aLdPq+6Q==, tableContent=null), ArticleFig(id=1154038647985787023, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=CN, label=图11, caption=
采用改进控制策略时的主导极点分布, figureFileSmall=+Sb5T9gt0vwKo8rlpBqgpA==, figureFileBig=7aOs72Ax2rZ7R+aLdPq+6Q==, tableContent=null), ArticleFig(id=1154038648094838930, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=EN, label=Fig. 12, caption=
Transfer function of system, figureFileSmall=kXlKM2rFWEuLMRNHlJBC9A==, figureFileBig=LAw/NkbiTC8MfAGOxWE68g==, tableContent=null), ArticleFig(id=1154038648153559189, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=CN, label=图12, caption=
系统传递函数, figureFileSmall=kXlKM2rFWEuLMRNHlJBC9A==, figureFileBig=LAw/NkbiTC8MfAGOxWE68g==, tableContent=null), ArticleFig(id=1154038648216473752, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=EN, label=Fig. 13, caption=
Waveforms under two strategies when ${L}_{\mathrm{g}}= 0\mathrm{{mH}}$, figureFileSmall=IRjOG4EyecsRCS6OOy86jg==, figureFileBig=ap5X/XPkHuAY10CYr3UY5g==, tableContent=null), ArticleFig(id=1154038648266805403, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=CN, label=图13, caption=
${L}_{\mathrm{g}}= 0\mathrm{{mH}}$ 时两种策略波形, figureFileSmall=IRjOG4EyecsRCS6OOy86jg==, figureFileBig=ap5X/XPkHuAY10CYr3UY5g==, tableContent=null), ArticleFig(id=1154038648329719966, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=EN, label=Fig. 14, caption=
Waveforms under two strategies when ${L}_{\mathrm{g}}= 3\mathrm{{mH}}$, figureFileSmall=mELgzQr6e4mmH6gmWOBp1A==, figureFileBig=P/PC4ovhooonH/IfBdtT/Q==, tableContent=null), ArticleFig(id=1154038648417800355, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=CN, label=图14, caption=
${L}_{\mathrm{g}}= 3\mathrm{{mH}}$ 时两种策略波形, figureFileSmall=mELgzQr6e4mmH6gmWOBp1A==, figureFileBig=P/PC4ovhooonH/IfBdtT/Q==, tableContent=null), ArticleFig(id=1154038648505880743, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=EN, label=Fig. 15, caption=
Photo of experimental prototype, figureFileSmall=C3eBCgPcaiW9IkYBqi2ToQ==, figureFileBig=VUKLHhKgqWyLsSDVD4/78w==, tableContent=null), ArticleFig(id=1154038648564601003, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=CN, label=图15, caption=
实验样机图片, figureFileSmall=C3eBCgPcaiW9IkYBqi2ToQ==, figureFileBig=VUKLHhKgqWyLsSDVD4/78w==, tableContent=null), ArticleFig(id=1154038648623321261, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=EN, label=Fig. 16, caption=
Experimental under two strategies when ${L}_{\mathrm{g}}= 0\mathrm{{mH}}$, figureFileSmall=aewPFXSUzoNMnKVjuZea5g==, figureFileBig=2bBhE6OmYAMQml8xRq8lUg==, tableContent=null), ArticleFig(id=1154038648723984561, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=CN, label=图16, caption=
${L}_{\mathrm{g}}= 0\mathrm{{mH}}$ 时两种策略实验, figureFileSmall=aewPFXSUzoNMnKVjuZea5g==, figureFileBig=2bBhE6OmYAMQml8xRq8lUg==, tableContent=null), ArticleFig(id=1154038648799482037, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=EN, label=Fig. 17, caption=
Experimental under two strategies when ${L}_{\mathrm{g}}= 3\mathrm{{mH}}$, figureFileSmall=fEAqbMccOG4u72TIU0X/Ag==, figureFileBig=t/L/3IMu2a/zW/05xiYZSg==, tableContent=null), ArticleFig(id=1154038648874979511, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=CN, label=图17, caption=
${L}_{\mathrm{g}}= 3\mathrm{{mH}}$ 时两种策略实验, figureFileSmall=fEAqbMccOG4u72TIU0X/Ag==, figureFileBig=t/L/3IMu2a/zW/05xiYZSg==, tableContent=null), ArticleFig(id=1154038648967254202, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=EN, label=Tab. 1, caption=
Simulation parameters, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 数值 | 参数 | 数值 |
| 直流电压${U}_{\mathrm{{dc}}}/\mathrm{V}$ | 180 | 电网电压${u}_{\mathrm{g}}/\mathrm{V}$ | 100 |
| 滤波电感${L}_{1}/\mathrm{{mH}}$ | 3 | 电网电压频率${f}_{0}/\mathrm{{Hz}}$ | 50 |
| 滤波电容$C/\mu \mathrm{F}$ | 10 | 采样频率${f}_{\mathrm{s}}/\mathrm{{kHz}}$ | 30 |
| 滤波电感${L}_{2}/\mathrm{{mH}}$ | 1 | 开关频率${f}_{\mathrm{{sw}}}/\mathrm{{kHz}}$ | 15 |
| 比例系数${K}_{\mathrm{p}}$ | 100 | 3th 谐振系数 | 95 |
| 基频谐振系数${K}_{\mathrm{{rl}}}$ | 0.6 | 5th 谐振系数 | 95 |
| 截止带宽${\omega }_{c}$ | 3.14 | 7th 谐振系数 | 80 |
| 谐振深度${\omega }_{\mathrm{f}}$ | 15 | 9th 谐振系数 | 70 |
), ArticleFig(id=1154038649038557372, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1154038485439729737, language=CN, label=表1, caption=
仿真参数, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 数值 | 参数 | 数值 |
| 直流电压${U}_{\mathrm{{dc}}}/\mathrm{V}$ | 180 | 电网电压${u}_{\mathrm{g}}/\mathrm{V}$ | 100 |
| 滤波电感${L}_{1}/\mathrm{{mH}}$ | 3 | 电网电压频率${f}_{0}/\mathrm{{Hz}}$ | 50 |
| 滤波电容$C/\mu \mathrm{F}$ | 10 | 采样频率${f}_{\mathrm{s}}/\mathrm{{kHz}}$ | 30 |
| 滤波电感${L}_{2}/\mathrm{{mH}}$ | 1 | 开关频率${f}_{\mathrm{{sw}}}/\mathrm{{kHz}}$ | 15 |
| 比例系数${K}_{\mathrm{p}}$ | 100 | 3th 谐振系数 | 95 |
| 基频谐振系数${K}_{\mathrm{{rl}}}$ | 0.6 | 5th 谐振系数 | 95 |
| 截止带宽${\omega }_{c}$ | 3.14 | 7th 谐振系数 | 80 |
| 谐振深度${\omega }_{\mathrm{f}}$ | 15 | 9th 谐振系数 | 70 |
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