Article(id=1203038991474975635, tenantId=1146029695717560320, journalId=1189987059142926344, issueId=1203038986534085494, articleNumber=null, orderNo=null, doi=10.19457/j.1001-2095.dqcd25364, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1694016000000, receivedDateStr=2023-09-07, revisedDate=1698854400000, revisedDateStr=2023-11-02, acceptedDate=null, acceptedDateStr=null, onlineDate=1764756446951, onlineDateStr=2025-12-03, pubDate=1713542400000, pubDateStr=2024-04-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1764756446951, onlineIssueDateStr=2025-12-03, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1764756446951, creator=13701087609, updateTime=1764756446951, updator=13701087609, issue=Issue{id=1203038986534085494, tenantId=1146029695717560320, journalId=1189987059142926344, year='2024', volume='54', issue='4', pageStart='3', pageEnd='96', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1764756445773, creator=13701087609, updateTime=1764756666322, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1203039911638163741, tenantId=1146029695717560320, journalId=1189987059142926344, issueId=1203038986534085494, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1203039911638163742, tenantId=1146029695717560320, journalId=1189987059142926344, issueId=1203038986534085494, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=21, endPage=26, ext={EN=ArticleExt(id=1203038991701468062, articleId=1203038991474975635, tenantId=1146029695717560320, journalId=1189987059142926344, language=EN, title=Frequency Domain Modeling and Design of Current Source Type Dual Active Bridge High-frequency Link for Flexible Interconnection, columnId=null, journalTitle=Electric Drive, columnName=null, runingTitle=null, highlight=null, articleAbstract=

The flexible DC interconnection of medium and low voltage can improve the flexibility and reliability of the distribution network,and the dual active bridge converter is a key link in achieving voltage conversion and electrical isolation in flexible interconnection equipment.The current source resonant dual active bridge utilizes DC capacitors to participate in resonance and soft switching design,which can significantly improve the power density and efficiency of the dual active bridge. However,there are significant differences in the characteristics between the current source resonant dual active bridge and the traditional voltage source resonant dual active bridge. The resonant cavity is composed of a DC resonant capacitor and an AC side resonant inductor,which leads to complex time-domain modeling of high-frequency current and affects the frequency design of zero current switching (ZCS),making it difficult to obtain analytical expressions for the ZCS switching frequency and resonant frequency. An equivalent circuit modeling method for high-frequency isolation links based on fundamental components from a frequency domain perspective was proposed,established an analytical relationship between ZCS switch frequency and resonant frequency,and verified the effectiveness and accuracy of the proposed method through simulation and experimental results.

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中低压柔性直流互联可提升配电网的灵活性和可靠性,双有源桥变换器是柔性互联装备中实现电压变换和电气隔离的关键环节。电流源谐振型双有源桥利用直流电容参与谐振和软开关设计,可大幅提高双有源桥功率密度和效率。然而,电流源谐振型双有源桥和传统电压源谐振型双有源桥特性存在较大差异,谐振腔由直流谐振电容和交流侧谐振电感组成,导致高频电流时域建模复杂,影响零电流软开关(ZCS)频率设计,难以得出ZCS开关频率与谐振频率的解析表达式。从频域角度,提出了基于基波分量的高频隔离环节等效电路建模方法,建立了ZCS开关频率与谐振频率的解析关系,仿真结果验证了所提方法的有效性和准确性。

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胡钰杰(1993—),男,博士,工程师,主要研究方向为电力电子技术在电网中的应用,Email:

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胡钰杰(1993—),男,博士,工程师,主要研究方向为电力电子技术在电网中的应用,Email:

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胡钰杰(1993—),男,博士,工程师,主要研究方向为电力电子技术在电网中的应用,Email:

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label=图8, caption=高频电压电流波形, figureFileSmall=oKJQ0UUxid03dPnY0WvGng==, figureFileBig=Va7b5TO7zeatWnNOiTxlqg==, tableContent=null), ArticleFig(id=1203077819774509155, tenantId=1146029695717560320, journalId=1189987059142926344, articleId=1203038991474975635, language=EN, label=表 1, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
参数 数值/kHz
不考虑直流电容谐振频率fr1LrCr)= 1 / 2 π L r C r 16.96
考虑直流电容谐振频率fr2Lr,Cr,C1,C2)= 1 / 2 π L r C r e q 30.00
按照fr1计算的开关频率fs1fr1,Tz)= 1 / ( 2 π L r C r + 2 T z ) 15.40
按照fr2计算的开关频率fs2fr2,Tz)= 1 / ( 2 π L r C r e q + 2 T z ) 25.40
基波近似计算实现ZCS所需开关频率fs=式(16) 20.00
), ArticleFig(id=1203077819862589545, tenantId=1146029695717560320, journalId=1189987059142926344, articleId=1203038991474975635, language=CN, label=null, caption=

ZCS开关频率计算结果 Tab.1 Calculation results of ZCS switching frequency

, figureFileSmall=null, figureFileBig=null, tableContent=
参数 数值/kHz
不考虑直流电容谐振频率fr1LrCr)= 1 / 2 π L r C r 16.96
考虑直流电容谐振频率fr2Lr,Cr,C1,C2)= 1 / 2 π L r C r e q 30.00
按照fr1计算的开关频率fs1fr1,Tz)= 1 / ( 2 π L r C r + 2 T z ) 15.40
按照fr2计算的开关频率fs2fr2,Tz)= 1 / ( 2 π L r C r e q + 2 T z ) 25.40
基波近似计算实现ZCS所需开关频率fs=式(16) 20.00
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适用于柔性互联的电流源型双有源桥高频环节频域建模及设计
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胡钰杰 , 朱胜龙 , 吴少雷 , 冯玉 , 王明 , 娄伟
电气传动 | 新能源输配电系统柔性互联装备及控制技术 2024,54(4): 21-26
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电气传动 | 新能源输配电系统柔性互联装备及控制技术 2024, 54(4): 21-26
适用于柔性互联的电流源型双有源桥高频环节频域建模及设计
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胡钰杰 , 朱胜龙, 吴少雷, 冯玉, 王明, 娄伟
作者信息
  • 国网安徽省电力有限公司电力科学研究院,安徽 合肥 230601
  • 胡钰杰(1993—),男,博士,工程师,主要研究方向为电力电子技术在电网中的应用,Email:

Frequency Domain Modeling and Design of Current Source Type Dual Active Bridge High-frequency Link for Flexible Interconnection
Yujie HU , Shenglong ZHU, Shaolei WU, Yu FENG, Ming WANG, Wei LOU
Affiliations
  • State Grid Anhui Electric Power Co.,Ltd. Electric Power Science Research Institute, Hefei 230601,Anhui,China
出版时间: 2024-04-20 doi: 10.19457/j.1001-2095.dqcd25364
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中低压柔性直流互联可提升配电网的灵活性和可靠性,双有源桥变换器是柔性互联装备中实现电压变换和电气隔离的关键环节。电流源谐振型双有源桥利用直流电容参与谐振和软开关设计,可大幅提高双有源桥功率密度和效率。然而,电流源谐振型双有源桥和传统电压源谐振型双有源桥特性存在较大差异,谐振腔由直流谐振电容和交流侧谐振电感组成,导致高频电流时域建模复杂,影响零电流软开关(ZCS)频率设计,难以得出ZCS开关频率与谐振频率的解析表达式。从频域角度,提出了基于基波分量的高频隔离环节等效电路建模方法,建立了ZCS开关频率与谐振频率的解析关系,仿真结果验证了所提方法的有效性和准确性。

双有源桥  /  电流源  /  谐振  /  高频环节建模  /  ZCS软开关

The flexible DC interconnection of medium and low voltage can improve the flexibility and reliability of the distribution network,and the dual active bridge converter is a key link in achieving voltage conversion and electrical isolation in flexible interconnection equipment.The current source resonant dual active bridge utilizes DC capacitors to participate in resonance and soft switching design,which can significantly improve the power density and efficiency of the dual active bridge. However,there are significant differences in the characteristics between the current source resonant dual active bridge and the traditional voltage source resonant dual active bridge. The resonant cavity is composed of a DC resonant capacitor and an AC side resonant inductor,which leads to complex time-domain modeling of high-frequency current and affects the frequency design of zero current switching (ZCS),making it difficult to obtain analytical expressions for the ZCS switching frequency and resonant frequency. An equivalent circuit modeling method for high-frequency isolation links based on fundamental components from a frequency domain perspective was proposed,established an analytical relationship between ZCS switch frequency and resonant frequency,and verified the effectiveness and accuracy of the proposed method through simulation and experimental results.

dual active bridge  /  current source  /  resonance  /  high-frequency link modeling  /  zero current switching (ZCS) soft switching
胡钰杰, 朱胜龙, 吴少雷, 冯玉, 王明, 娄伟. 适用于柔性互联的电流源型双有源桥高频环节频域建模及设计. 电气传动, 2024 , 54 (4) : 21 -26 . DOI: 10.19457/j.1001-2095.dqcd25364
Yujie HU, Shenglong ZHU, Shaolei WU, Yu FENG, Ming WANG, Wei LOU. Frequency Domain Modeling and Design of Current Source Type Dual Active Bridge High-frequency Link for Flexible Interconnection[J]. Electric Drive, 2024 , 54 (4) : 21 -26 . DOI: 10.19457/j.1001-2095.dqcd25364
随着分布式新能源在配电网渗透率的快速攀升,配电网电压越限、潮流反送、谐波污染等问题愈发突出。基于电力电子变压器(power electronics transformer,PET)的柔性互联装置可显著提高配电网的灵活性和可靠性、改善电能质量,对配电网优化运行和分布式新能源消纳利用具有重要意义。PET通过电力电子技术与高频变压器相结合,不仅可以实现传统工频变压器电压变换和电气隔离的功能,还可实现无功补偿、谐波治理、可再生能源/储能直流接入等功能[1-4]。高频隔离型DC-DC变换器是PET的核心环节,其运行特性直接影响到系统效率和可靠性[5]。现有的适用于高压大功率场合的隔离型DC-DC变换器主要可以分为移相型双有源桥 (dual active bridge,DAB)和串联谐振型DAB两种。其中移相型DAB虽然可控性较强,但其零电压开通(zero voltage switching,ZVS)范围受负载影响且存在较大的关断损耗[6]。串联谐振型DAB通过开环控制工作在谐振频率下可实现零电流关断(zero current switching,ZCS),通过合理设计励磁电感和死区时间可实现ZVS[7-8],基于此优点,在仅需要电气隔离和电压变换的场合,将串联谐振DAB作为高频隔离环节变换器更有利于效率的提高[9]
现有串联谐振型DAB都需要直流储能电容维持恒定直流电压,然而直流储能电容体积庞大,占DAB功率模块总体积的约30%,限制了DAB功率密度的提高。电流源型谐振双有源桥可大幅降低直流电容容值,降低电容体积,提高功率密度,然而减小使得直流侧不再可以等效为直流电压源来分析,而是会参与谐振,影响谐振频率,如果依然按照原有的串联谐振电容和谐振电感来设计开关频率将无法满足ZCS。因此,减小直流电容后的高频电流特性需要重新进行建模分析,保证ZCS软开关。现有文献对于串联谐振DAB的分析基本都将直流侧等效为电压源,关于直流电容对于谐振电流影响的分析较少。文献[10]提出了一类直流电容参与谐振的直流变压器拓扑,并分析了小直流电容对于高频谐振电流的影响,但是该文分析的是采用单只开关器件的直流变换器电路,不适用于大功率场合。文献[11]分析了小直流电容下串联谐振型DAB高压侧采用半桥,低压侧采用全桥下的高频电流特性。文献[12-13]分析了串联谐振型DAB高低压侧都采用半桥结构下的高频电流特性,并给出了ZCS开关频率与谐振频率的关系。然而,全桥和半桥拓扑中的直流电容在高频开关周期内的充放电特性不同:半桥结构中直流电容存在半个高频开关周期都处于充电的状态,而全桥结构直流电容在半个开关周期即完成充放电,文献[14]推导了全桥结构的串联谐振型DAB在小直流电容参与谐振下高频电流表达式。但是现有文献均是从时域角度对高频环节进行分析,无法得出开关频率和谐振频率的解析表达式,导致ZCS开关频率计算过程复杂,物理意义不清晰。
为了揭示直流电容参与谐振对谐振频率和开关频率的影响,得出开关频率和谐振频率直接解析关系,本文从频域角度推导得到了直流谐振电容在高频交流侧的等效模型,建立了电流源谐振型DAB高频环节等效电路,据此计算得到了实现ZCS软开关的开关频率和直流电容、串联谐振电容、谐振电感之间的定量关系以及影响规律。最后,通过仿真验证了模型的正确性和ZCS开关频率设计的准确性。
本节主要介绍电流源谐振型双有源桥电路拓扑和高频环节频域建模。
电流源谐振型双有源桥电路如图1所示,由输入侧直流滤波电感Li、输出侧直流滤波电感Lo、输入侧直流电容C1、输出侧直流电容C2、输入侧H桥H1、输出侧H桥H2、高频变压器HFT、串联谐振电容Cr组成,其中高频变压器折算至原边的漏感为Lr
为了揭示开关频率和谐振频率不一致的原因,统一开关正负半周等效电路,下面采用基波近似法(first harmonic approximation,FHA)进行分析。FHA即将高频谐振电流按照基波进行近似,忽略谐波和死区影响,从而简化分析。根据文献[14]可知高频电流不是纯正弦电流,将正负半周的非纯正弦电流按照一个角频率等于开关角频率ωs的正弦电流Issin(ωst)近似,近似结果如图2虚线所示。
根据上述近似,推导图1中副边交流端口等效电路如图3所示,原边交流端口等效电路推导方法类似。
将交流侧电流近似为正弦电流:
i r s ( t ) = I r s s i n ( ω s t )
式中:Irs为交流电流幅值;ωs为交流电流角频率。
已知直流侧输出电流为i2,可根据电容C2充放电平衡条件建立交流电流幅值Irs与直流电流i2的关系。电容C2的电流为
i C 2 ( t ) = I r s s i n ( ω s t ) - i 2     t [ 0 , T s / 2 ] - I r s s i n ( ω s t ) - i 2     t [ T s / 2 , T s ]
根据电容C2在半开关周期Ts/2充放电平衡,可以得到:
0 T s / 2 [ I r s s i n ( ω s t ) - i 2 ] d t = 0
求解式(3)可得交流电流幅值Irs与直流电流i2的关系为
I r s = ( π / 2 ) i 2
所以,交流电流irst)可表示为
i r s ( t ) = π 2 i 2 s i n ( ω s t )
交流电压ust)可表示为
u s ( t ) = u d c 2 ( t )     t [ 0 , T s / 2 ) - u d c 2 ( t )     t [ T s / 2 , T s ]
根据交流电流irst)和直流电容电流iC2t)的表达式,可推导得到交流电压ust)的表达式为
u s ( t ) = u d c 2 ( 0 ) - π i 2 2 ω s C 2 c o s ( ω s t )   + π i 2 2 ω s C 2 - i 2 t C 2             t [ 0 , T s / 2 ) - u d c 2 ( 0 ) - π i 2 2 ω s C 2 c o s ( ω s t ) - π i 2 2 ω s C 2 + i 2 ( t - T s / 2 ) C 2       t [ T s / 2 , T s ]
根据式(7),可将交流电压ust)分成三部分,分别为方波电压usqt)、余弦电压ucost)和三角波电压utrit),分解后的电压波形如图4a所示。三部分电压分量可用基波进行近似,电压波形如图4b所示,近似后的表达式如下式所示:
u s q _ F ( t ) = 4 π u d c 2 ( 0 ) s i n ( ω s t )
u c o s _ F ( t ) = - π i 2 2 ω s C 2 c o s ( ω s t )
u t r i _ F ( t ) = 4 i 2 π ω s C 2 c o s ( ω s t )
交流端口电压ust)可用基波近似为us_Ft),如下式所示:
u s _ F ( t ) = u s q _ F ( t ) + u c o s _ F ( t ) + u t r i _ F ( t ) = 4 π u d c 2 ( 0 ) s i n ( ω s t ) - π i 2 2 ω s C 2 c o s ( ω s t ) + 4 i 2 π ω s C 2 c o s ( ω s t )
根据交流端口基波近似电压us_Ft)和基波近似电流irst)可得出交流端口等效电路。由式(11)可知,交流端口基波近似电压us_Ft)中含有与交流端口电流同相位的部分、有超前电流90°的成分和滞后电流90°的成分,因此等效电路中含有电阻、电感和电容,如图5所示。
等效电路中元件的参数可通过下式计算:
R a c = u s q _ F i r s = 8 π 2 R l o a d L e q s = u t r i _ F d i r s / d t = 8 π 2 ω s 2 C 2 C e q s = i r s d u c o s _ F / d t = C 2
从式(12)发现,虽然图1副边电路中没有感性元件,但是交流端口等效电路中含有电感,这是电压分量中utrit)产生的。
对原边采用同样的分析方法,原边H桥直流侧等效到交流侧的等效电路如图6所示,其由交流电源、电感和电容组成。其中:
u p _ s q _ F ( t ) = 4 π u d c 1 ( 0 ) s i n ( ω s t ) L e q p = u p _ t r i _ F d i r / d t = 8 π 2 ω s 2 C 1 C e q p = i r d u p _ c o s _ F / d t = C 1
结合原边和副边交流等效电路和变压器T型等效电路,可得折算至原边的SR-DAB基波等效电路如图7所示,图中虚线框内为原副边交流端口等效电路,变压器原副边变比为n∶1,Lrp为变压器原边漏感,n2Lrs为折算至原边的变压器副边漏感,Crp为原边串联谐振电容,Crs/n2为折算至原边的副边串联电容,Lm为变压器励磁电感。从基波等效电路可以进一步看出,与传统的大直流电容电压源谐振型DAB不同的是,交流等效电路中引入了等效电感Leqp,Leqs和等效电容Ceqp,Ceqs元件,因此要实现ZCS软开关,不仅要考虑变压器漏感Lrp,Lrs和串联谐振电容Crp,Crs,还要考虑等效电感Leqp,Leqs和等效电容Ceqp,Ceqs的影响。
要实现ZCS软开关运行,从基波近似等效电路来看,即让原边方波电压的基波分量up_sq_F与原边电流的基波分量ir同相位,也就是让SR-DAB基波近似等效电路中的电感和电容回路阻抗为零,只有负载电阻。基波近似等效电路中的等效电感可表示为
L e q = L e q p + n 2 L e q s + L r p + n 2 L r s = 8 π 2 ω s 2 ( 1 C 1 + n 2 C 2 ) + L r
可以看出,等效电感中除了含有折算至变压器原边的电感Lr,还含有直流电容C1C2引入等效电感 8 π 2 ω s 2 ( 1 / C 1 + n 2 / C 2 )
基波近似等效电路中的等效电容可表示为
C e q = 1 1 C e q p + 1 C r p + n 2 C r s + n 2 C e q s = 1 1 C 1 + n 2 C 2 + 1 C r p + n 2 C r s
可以看出,基波近似等效电路中的串联等效电容相当于直流电容C1,C2和串联谐振电容Crp,Crs串联组成。
根据等效电感和等效电容可计算出谐振频率fr,谐振频率fr与开关频率fs相关。要实现ZCS,需要满足基波近似等效电路中激励电源up_sq_F的频率fs与谐振电路的谐振频率fr相等,而激励电源up_sq_F的频率受开关频率控制,所以控制开关频率fs等于谐振频率fr可得:
f s = 1 2 π ( 1 - 8 π 2 ) 1 L r ( 1 C 1 + n 2 C 2 ) + 1 L r ( 1 C r p + n 2 C r s )
式(16)从数学上给出了直流电容C1C2,漏感Lr以及串联谐振电容CrpCrs关于实现ZCS所需开关频率fs的定量关系,进一步揭示了直流电容对于开关频率的影响规律,即直流电容参与谐振,在开关频率计算中引入了 ( 1 - 8 π 2 ) 1 L r ( 1 C 1 + n 2 C 2 )部分,可以看出,当直流电容无穷大时,这部分等于0,上式即退化成传统的开关频率计算公式。相比时域精确求解方法,基波近似求解方法更容易揭示系统的物理意义。
为了验证基频近似的高频环节频域建模及ZCS开关频率设计的正确性,搭建了仿真模型,电路拓扑如图1所示,仿真参数如下:输入电压uin=450 V,输出电压uout=300 V,负载功率P=10 kW,高频变压器电压比n=3∶2,高频变压器漏感Lr=8.8 μH,高频变压器励磁电感Lm=2 mH,串联谐振电容Cr=10 μF,直流电容C1=15.4 μF,直流电容C2=15.4 μF,DAB死区时间Tz=3 μs,开关频率fs=20 kHz。其中LrCr为折算至变压器原边的漏感和谐振电容。根据仿真参数计算得到表1
表1可以看出,按照基波近似求解结果可得开关频率为20 kHz,与仅仅考虑高频谐振环节谐振频率fr1以及考虑直流电容参与谐振的谐振频率fr2计算出的开关频率均有较大差异。图8a~图8c为按照开关频率fsfs1fs2进行仿真得到的高频开关周期波形。从图8a可以看出,高频隔离环节工作在串联谐振状态,高频电压up和高频电流ir均同相位,实现了ZCS软开关,验证了ZCS开关频率设计的正确性。按照表1fs1=15.4 kHz进行仿真,高频电压电流仿真结果如图8b所示,可以看出,开关频率偏低,无法实现ZCS,且会产生无功电流,增加了电流应力。按照表2fs2=25.40 kHz进行仿真,仿真结果如图8c所示,可以看出,开关频率偏高,也无法实现ZCS,导致较大的关断损耗。
上述仿真结果说明了高频环节频域建模的正确性,也说明了ZCS开关频率设计的准确性。
中低压柔性互联装备通常采用具有高频隔离环节的DAB组合实现,本文以电流源谐振型DAB为研究对象,采用基波近似方法从频域的角度对其高频环节进行了建模和ZCS开关频率设计。频域建模表明,DAB高频交流端口阻抗可分别用电感、电容和电阻(输入侧用电源)进行描述,并解析得到了实现ZCS所需开关频率与电路参数的数学关系。相比于时域精确分析,频域建模分析利用统一的正负半周等效电路揭示了开关频率与谐振频率不相等的原因,物理意义明确,仿真结果验证了建模的正确性和ZCS开关频率设计的准确性。
  • 国网安徽省电力有限公司科技项目(B31205230006)
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doi: 10.19457/j.1001-2095.dqcd25364
  • 接收时间:2023-09-07
  • 首发时间:2025-12-03
  • 出版时间:2024-04-20
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  • 收稿日期:2023-09-07
  • 修回日期:2023-11-02
基金
国网安徽省电力有限公司科技项目(B31205230006)
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    国网安徽省电力有限公司电力科学研究院,安徽 合肥 230601
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2种不同金属材料的力学参数

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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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