Article(id=1190594703977492708, tenantId=1146029695717560320, journalId=1190306094246359042, issueId=1190594635056689366, articleNumber=null, orderNo=null, doi=10.19595/j.cnki.1000-6753.tces.242266, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1734364800000, receivedDateStr=2024-12-17, revisedDate=1736179200000, revisedDateStr=2025-01-07, acceptedDate=null, acceptedDateStr=null, onlineDate=1761789497607, onlineDateStr=2025-10-30, pubDate=1746806400000, pubDateStr=2025-05-10, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1761789497607, onlineIssueDateStr=2025-10-30, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1761789497607, creator=13701087609, updateTime=1761789497607, updator=13701087609, issue=Issue{id=1190594635056689366, tenantId=1146029695717560320, journalId=1190306094246359042, year='2025', volume='40', issue='9', pageStart='2679', pageEnd='3012', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1761789481176, creator=13701087609, updateTime=1761791537510, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1190603259996946565, tenantId=1146029695717560320, journalId=1190306094246359042, issueId=1190594635056689366, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1190603259996946566, tenantId=1146029695717560320, journalId=1190306094246359042, issueId=1190594635056689366, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=2712, endPage=2723, ext={EN=ArticleExt(id=1190594704300454118, articleId=1190594703977492708, tenantId=1146029695717560320, journalId=1190306094246359042, language=EN, title=Extended Impedance Modal Analysis of the Internal Dynamics in Grid-Forming Inverters, columnId=null, journalTitle=Transactions of China Electrotechnical Society, columnName=null, runingTitle=null, highlight=null, articleAbstract=
The dynamic characteristic of grid-forming inverter (GFM) is mainly affected by the control strategy, and the interaction with the power grid may cause instability such as oscillation. At the same time, the interactive coupling between different time-scale controllers in GFM makes the stability analysis more complicated. Modal analysis based on the state-space model (MASS) uses the participation factor (PF) to quantify the contribution of each state variable to a particular pattern. However, the number of electrical components in new power systems is increasing explosively, and the difficulty of state-space modeling of the whole system is increasing rapidly. In addition, state-space modeling requires detailed system structure topology and complete control parameters of each electrical component, and inverters usually only have impedance models that describe the characteristics of voltage and current ports, with gray box or black box characteristics.
In order to explore the interaction characteristics among all electrical components of the system, the dynamic model of the whole system is constructed by the closed-loop feedback formula of the whole system dynamic matrix. Based on this foundation, the modal analysis based on impedance model (MAI) can evaluate the contribution of each power device to oscillation modes at the device level. However, MAI treats inverters as single, holistic components, which limits its ability to identify dominant system dynamics at the control loop or state variable level. Decomposing different control loops into equivalent circuit components enables the stability analysis of internal inverter dynamics. However, the decomposition of synchronization control loops remains to be explored. This paper proposes an extended modal analysis based on impedance model (EMAI) method to address the current challenges faced by MAI.
First, a decomposition method for the GFM impedance model based on the matrix inversion lemma was proposed, dividing GFM dynamics into synchronous dynamics (SD), dominated by the power frequency synchronization loop (PFL), and electromagnetic dynamics (ED), governed by the voltage control loop (VCL). The detailed categorization of dynamics facilitates an in-depth exploration of the complex coupling mechanisms among controllers operating on different time scales. Subsequently, overall impedance participation factors and participation ratios (PR) were introduced to characterize different internal dynamics of GFM, enabling the evaluation of SD and ED contributions at the control loop level. These metrics help identify the dominant system dynamics and trace the root causes of system instability. Finally, an explicit parameter PF was introduced to precisely locate the critical control parameters of identified loops, serving as a metric for optimizing control parameters and enhancing system damping.
The analysis yields the following conclusion: as the frequency of oscillation modes decreases, the dominant dynamics within each GFM gradually shift from ED to SD. MAI can provide an overall assessment of GFM participation but fails to capture the dominant dynamics of individual GFMs. EMAI not only identifies interactions between various GFMs and the grid but also evaluates the contributions of ED and SD within GFM through overall impedance participation factors, thereby pinpointing the primary causes affecting system dynamics to specific control loops. Moreover, the results of EMAI and MASS in assessing the participation levels of different GFM dynamics are highly consistent, validating the effectiveness of the EMAI method. Furthermore, the explicit parameter PF provides effective recommendations for improving system damping and enhancing stability. EMAI offers nuanced insights into system stability analysis, enabling the rapid identification of the root causes of system instability.
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随着构网型逆变器(GFM)在电力系统中的渗透率不断提高,电力系统的动态特性发生了重大变化。基于阻抗模型的模态分析(MAI)方法通过阻抗参与因子评估电源与电网的交互作用。然而,由于MAI使用阻抗端口模型,将GFM视为一个整体,难以揭示GFM内部不同控制回路之间的复杂动力学耦合机制。该文提出一种扩展阻抗模态分析(EMAI)方法,首先将GFM动态等效分解为功率频率同步控制主导的同步动态和电压控制主导的电磁动态;其次,分别计算两类动态的等效阻抗参与因子和参与比,确定系统的主导动态;然后,提出显式参数参与因子,用于进一步识别主导动态控制回路的关键参数,为提升系统的稳定性奠定基础;最后,通过对改造的14和68母线系统进行仿真,验证所提方法的有效性。EMAI方法使得基于阻抗模型分析GFM内部各控制环节的动力学特性成为可能,无需建立全系统状态空间模型即可有效识别影响系统稳定性的关键控制回路,具有广泛的应用价值。
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郑佳杰 男,2001年生,硕士研究生,研究方向为电力系统稳定与控制。E-mail:zjj978626117@163.com
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郑佳杰 男,2001年生,硕士研究生,研究方向为电力系统稳定与控制。E-mail:zjj978626117@163.com
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37(6): 4541-4554., articleTitle=Revisiting grid-forming and grid-following inverters: a duality theory, refAbstract=null)], funds=[Fund(id=1190723824569168203, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, awardId=52307095, language=CN, fundingSource=国家自然科学基金资助项目(52307095), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1190723816960700688, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, xref=null, ext=[AuthorCompanyExt(id=1190723816969089297, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, companyId=1190723816960700688, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University 102206 China), AuthorCompanyExt(id=1190723816977477906, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, companyId=1190723816960700688, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=新能源电力系统全国重点实验室(华北电力大学) 北京 102206)])], figs=[ArticleFig(id=1190723819242402085, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=EN, label=Fig.1, caption=
Whole system small signal impedance model, figureFileSmall=OltXwQDDSqwZLRwTu8Cgvw==, figureFileBig=O0c7CGojAKDoRrihbou60w==, tableContent=null), ArticleFig(id=1190723819397591334, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=CN, label=图1, caption=
全系统小信号阻抗模型, figureFileSmall=OltXwQDDSqwZLRwTu8Cgvw==, figureFileBig=O0c7CGojAKDoRrihbou60w==, tableContent=null), ArticleFig(id=1190723819561169191, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=EN, label=Fig.2, caption=
GFM structure, figureFileSmall=TQlexmQ48ZM8nUlxaYRXBA==, figureFileBig=48laje/OYpAnNOD4XoGEfA==, tableContent=null), ArticleFig(id=1190723819926073640, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=CN, label=图2, caption=
构网型逆变器结构, figureFileSmall=TQlexmQ48ZM8nUlxaYRXBA==, figureFileBig=48laje/OYpAnNOD4XoGEfA==, tableContent=null), ArticleFig(id=1190723820060291369, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=EN, label=Fig.3, caption=
Coordinate system transformation, figureFileSmall=oQC9Pv1JGD34qhB1XFHkvg==, figureFileBig=gtVfBgwN93vqxylBcMaCEw==, tableContent=null), ArticleFig(id=1190723820219674922, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=CN, label=图3, caption=
坐标系变换, figureFileSmall=oQC9Pv1JGD34qhB1XFHkvg==, figureFileBig=gtVfBgwN93vqxylBcMaCEw==, tableContent=null), ArticleFig(id=1190723820320338219, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=EN, label=Fig.4, caption=
Impedance relationship between swing frame and global frame, figureFileSmall=Z0eERa4luZvF+prl5LeH5g==, figureFileBig=J9s9a+yQuN6K5Xz5/XkIRw==, tableContent=null), ArticleFig(id=1190723820433584428, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=CN, label=图4, caption=
摇摆坐标系和全局坐标系阻抗关系, figureFileSmall=Z0eERa4luZvF+prl5LeH5g==, figureFileBig=J9s9a+yQuN6K5Xz5/XkIRw==, tableContent=null), ArticleFig(id=1190723820609745197, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=EN, label=Fig.5, caption=
Impedance Bode diagram, figureFileSmall=XfOGP8xUbUmtyL7hknO5BQ==, figureFileBig=Amev23DWWg8jrBgZ4GwM+Q==, tableContent=null), ArticleFig(id=1190723820739768622, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=CN, label=图5, caption=
阻抗伯德图, figureFileSmall=XfOGP8xUbUmtyL7hknO5BQ==, figureFileBig=Amev23DWWg8jrBgZ4GwM+Q==, tableContent=null), ArticleFig(id=1190723820832043311, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=EN, label=Fig.6, caption=
Impedance differential operation, figureFileSmall=QYbj72k2mv+RaXiRSRKqoQ==, figureFileBig=T6ov5Taw3ovvbUoo0NFbDg==, tableContent=null), ArticleFig(id=1190723820907540784, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=CN, label=图6, caption=
阻抗微分运算, figureFileSmall=QYbj72k2mv+RaXiRSRKqoQ==, figureFileBig=T6ov5Taw3ovvbUoo0NFbDg==, tableContent=null), ArticleFig(id=1190723821029175601, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=EN, label=Fig.7, caption=
Modified IEEE 14 bus system, figureFileSmall=21dgBW1c6uOc4Ek5QmiJPg==, figureFileBig=Nd8J1ddnHG8tfCH544v0KQ==, tableContent=null), ArticleFig(id=1190723821108867378, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=CN, label=图7, caption=
改造IEEE 14母线系统, figureFileSmall=21dgBW1c6uOc4Ek5QmiJPg==, figureFileBig=Nd8J1ddnHG8tfCH544v0KQ==, tableContent=null), ArticleFig(id=1190723821205336371, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=EN, label=Fig.8, caption=
Modified IEEE 14 bus system pole distribution, figureFileSmall=QUBTq/5WZ2Wetq1r9D3jsQ==, figureFileBig=6E1SBdShx66cklBvTDR5dA==, tableContent=null), ArticleFig(id=1190723821310193972, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=CN, label=图8, caption=
改造IEEE 14母线系统极点分布, figureFileSmall=QUBTq/5WZ2Wetq1r9D3jsQ==, figureFileBig=6E1SBdShx66cklBvTDR5dA==, tableContent=null), ArticleFig(id=1190723821389885749, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=EN, label=Fig.9, caption=
Modified IEEE 14 bus system GFM participation assessment, figureFileSmall=iiSb5jdDz7wYTahNlrgWrg==, figureFileBig=sNBqFa5COPOyvXN26DVvMQ==, tableContent=null), ArticleFig(id=1190723821582823734, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=CN, label=图9, caption=
改造IEEE 14母线系统GFM参与评估, figureFileSmall=iiSb5jdDz7wYTahNlrgWrg==, figureFileBig=sNBqFa5COPOyvXN26DVvMQ==, tableContent=null), ArticleFig(id=1190723821788344631, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=EN, label=Fig.10, caption=
GFM2 and GFM3 oscillation waveforms, figureFileSmall=HgK5+O0XsvSjPJdxapoXLw==, figureFileBig=RN0wpTgXggOwJTwJpsdWDA==, tableContent=null), ArticleFig(id=1190723821909979448, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=CN, label=图10, caption=
GFM2和GFM3振荡波形, figureFileSmall=HgK5+O0XsvSjPJdxapoXLw==, figureFileBig=RN0wpTgXggOwJTwJpsdWDA==, tableContent=null), ArticleFig(id=1190723821993865529, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=EN, label=Fig.11, caption=
Modified IEEE 68 bus system, figureFileSmall=bwAZht8JjbYuKXpU1Ds+0g==, figureFileBig=mZhChlInzkHBC1zKM7lQmQ==, tableContent=null), ArticleFig(id=1190723822165831994, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=CN, label=图11, caption=
改造IEEE 68母线系统, figureFileSmall=bwAZht8JjbYuKXpU1Ds+0g==, figureFileBig=mZhChlInzkHBC1zKM7lQmQ==, tableContent=null), ArticleFig(id=1190723822362964283, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=EN, label=Fig.12, caption=
Modified IEEE 68 bus system GFM participation assessment, figureFileSmall=2ZSw4R7oxBIW1wAm8zGUFw==, figureFileBig=tdPMe7L+KPNB7NiCqq8zOw==, tableContent=null), ArticleFig(id=1190723822807560508, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=CN, label=图12, caption=
改造IEEE 68母线系统GFM参与评估, figureFileSmall=2ZSw4R7oxBIW1wAm8zGUFw==, figureFileBig=tdPMe7L+KPNB7NiCqq8zOw==, tableContent=null), ArticleFig(id=1190723822912418109, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=EN, label=Fig.13, caption=
Pole distribution before and after parameter tuning, figureFileSmall=Vug2Ml7oFpsxRb6eCCGH/Q==, figureFileBig=nB87joQZNZVrqT0FS9tsMQ==, tableContent=null), ArticleFig(id=1190723823038247230, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=CN, label=图13, caption=
参数调整前后极点分布, figureFileSmall=Vug2Ml7oFpsxRb6eCCGH/Q==, figureFileBig=nB87joQZNZVrqT0FS9tsMQ==, tableContent=null), ArticleFig(id=1190723823206019391, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=EN, label=App.Fig.1, caption=
Impedance comparison before and after GFM simplification, figureFileSmall=wF3+dKTx22F7KpIniVblFQ==, figureFileBig=5DEogfumSec8/H+bu0i1CQ==, tableContent=null), ArticleFig(id=1190723823268933952, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=CN, label=附图1, caption=
GFM简化前后的阻抗对比, figureFileSmall=wF3+dKTx22F7KpIniVblFQ==, figureFileBig=5DEogfumSec8/H+bu0i1CQ==, tableContent=null), ArticleFig(id=1190723823357014337, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=EN, label=Tab.1, caption=
Comparison of different modal analysis methods
, figureFileSmall=null, figureFileBig=null, tableContent=
| 方法 | MASS | MAI | EMAI |
| 适用于灰盒或黑盒系统 | — | + | + |
| 计算仅需系统部分信息 | — | + | + |
| 确定主导电源 | + | + | + |
| 确定主导电源的关键动态 | + | — | + |
), ArticleFig(id=1190723823449289026, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=CN, label=表1, caption=
不同模态分析方法的对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| 方法 | MASS | MAI | EMAI |
| 适用于灰盒或黑盒系统 | — | + | + |
| 计算仅需系统部分信息 | — | + | + |
| 确定主导电源 | + | + | + |
| 确定主导电源的关键动态 | + | — | + |
), ArticleFig(id=1190723823541563715, tenantId=1146029695717560320, journalId=1190306094246359042, articleId=1190594703977492708, language=EN, label=Tab.2, caption=
IEEE 68 bus system mode 2 parameter PF
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数 | 数值 |
| GFM50 | GFM51 |
| VCL比例增益 | -0.210 5-j0.025 7 | -0.228 7-j0.013 6 |
| VCL积分增益 | -0.000 2+j0.002 1 | -0.000 1+j0.002 2 |
| PFL下垂系数 | 1 281.33-j4 616.63 | 1 094.64-j5 088.29 |
| PFL滤波带宽ff /Hz | 0.49-j0.78 | 0.49-j0.88 |
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IEEE 68母线系统模式2的参数参与因子
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| 参数 | 数值 |
| GFM50 | GFM51 |
| VCL比例增益 | -0.210 5-j0.025 7 | -0.228 7-j0.013 6 |
| VCL积分增益 | -0.000 2+j0.002 1 | -0.000 1+j0.002 2 |
| PFL下垂系数 | 1 281.33-j4 616.63 | 1 094.64-j5 088.29 |
| PFL滤波带宽ff /Hz | 0.49-j0.78 | 0.49-j0.88 |
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IEEE 14 bus system inverter parameters
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| 参数 | 数值 |
| GFM2 | GFM3 | GFM6和8 |
| CCL比例增益 | 1 | 1 | 1 |
| CCL积分增益 | 1 570.79 | 1 570.79 | 1 570.79 |
| VCL比例增益 | 0.25 | 0.3 | 0.3 |
| VCL积分增益 | 4 908.74 | 7 068.58 | 7 068.58 |
| PFL下垂系数 | 0.003 | 0.03 | 0.01 |
| PFL滤波带宽ff /Hz | 8 | 8 | 8 |
| 滤波电阻R(pu) | 0.01 | 0.01 | 0.01 |
| 滤波电感L(pu) | 0.05 | 0.05 | 0.05 |
| 滤波电容C(pu) | 0.05 | 0.05 | 0.05 |
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IEEE 14母线系统逆变器参数
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| 参数 | 数值 |
| GFM2 | GFM3 | GFM6和8 |
| CCL比例增益 | 1 | 1 | 1 |
| CCL积分增益 | 1 570.79 | 1 570.79 | 1 570.79 |
| VCL比例增益 | 0.25 | 0.3 | 0.3 |
| VCL积分增益 | 4 908.74 | 7 068.58 | 7 068.58 |
| PFL下垂系数 | 0.003 | 0.03 | 0.01 |
| PFL滤波带宽ff /Hz | 8 | 8 | 8 |
| 滤波电阻R(pu) | 0.01 | 0.01 | 0.01 |
| 滤波电感L(pu) | 0.05 | 0.05 | 0.05 |
| 滤波电容C(pu) | 0.05 | 0.05 | 0.05 |
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Case 1~4 PI control parameters
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| 参数 | 数值 |
| 情况1 | 情况2 | 情况3 | 情况4 |
| VCL比例增益 | 0.15 | 0.2 | 0.25 | 0.3 |
| VCL积分增益 | 1 767.15 | 3 141.59 | 4 908.74 | 7 068.58 |
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情况1~4的PI控制参数
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| 参数 | 数值 |
| 情况1 | 情况2 | 情况3 | 情况4 |
| VCL比例增益 | 0.15 | 0.2 | 0.25 | 0.3 |
| VCL积分增益 | 1 767.15 | 3 141.59 | 4 908.74 | 7 068.58 |
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IEEE 68 bus system inverter parameters
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| 参数 | 数值(所有GFM) |
| CCL比例增益 | 0.83 |
| CCL积分增益 | 1 308.99 |
| VCL比例增益 | 0.46 |
| VCL积分增益 | 19 798.58 |
| PFL下垂系数 | 0.001 |
| PFL滤波带宽ff /Hz | 5 |
| 滤波电阻R(pu) | 0.01 |
| 滤波电感L(pu) | 0.05 |
| 滤波电容C(pu) | 0.05 |
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IEEE 68母线系统逆变器参数
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| 参数 | 数值(所有GFM) |
| CCL比例增益 | 0.83 |
| CCL积分增益 | 1 308.99 |
| VCL比例增益 | 0.46 |
| VCL积分增益 | 19 798.58 |
| PFL下垂系数 | 0.001 |
| PFL滤波带宽ff /Hz | 5 |
| 滤波电阻R(pu) | 0.01 |
| 滤波电感L(pu) | 0.05 |
| 滤波电容C(pu) | 0.05 |
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