Article(id=1222543590488789903, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1222543587536003358, articleNumber=null, orderNo=null, doi=10.19666/j.rlfd.202303032, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1677686400000, receivedDateStr=2023-03-02, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1769406705733, onlineDateStr=2026-01-26, pubDate=1703433600000, pubDateStr=2023-12-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1769406705733, onlineIssueDateStr=2026-01-26, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1769406705733, creator=13701087609, updateTime=1769406705733, updator=13701087609, issue=Issue{id=1222543587536003358, tenantId=1146029695717560320, journalId=1210938733613449225, year='2023', volume='52', issue='12', pageStart='1', pageEnd='197', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1769406705029, creator=13701087609, updateTime=1773814454114, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1241031027209064788, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1222543587536003358, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1241031027209064789, tenantId=1146029695717560320, journalId=1210938733613449225, issueId=1222543587536003358, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=98, endPage=105, ext={EN=ArticleExt(id=1222543590723670936, articleId=1222543590488789903, tenantId=1146029695717560320, journalId=1210938733613449225, language=EN, title=Multi peak MPPT control of photovoltaic array based on improved aquila optimizer, columnId=1211002405299294959, journalTitle=Thermal Power Generation, columnName=Thermal energy science research, runingTitle=null, highlight=null, articleAbstract=

The photovoltaic array will produce multi-peak P-U characteristics under partial shading conditions. Aiming at the problem of how to quickly and accurately realize maximum power point tracking (MPPT) to avoid a large amount of energy loss, this paper proposes an improved aquila optimization (AO) algorithm, which uses Circle chaotic mapping and reverse learning strategy to reasonably allocate the initial population position, so as to shorten the optimization time of the algorithm. At the same time, spiral optimization is carried out for the short gliding attack in aquila optimization algorithm. The whale optimization algorithm is combined to improve local optimal stagnation and convergence speed. Simulations and experiments demonstrate that, in comparison to particle swarm optimization (PSO), whale optimization algorithm (WAO) and aquila optimization algorithm, the algorithm can search the global maximum power point with greater speed, accuracy and suppleness under both static and dynamic partial shading conditions.

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光伏阵列在局部遮荫条件下,会产生多峰值的功率-电压(P-U)特性,为了迅速精准地实现最大功率点追踪以避免大量的能源损失,提出一种改进的天鹰优化算法,通过Circle混沌映射及反向学习策略合理分配初始种群位置,以缩短算法寻优时间,同时对天鹰优化算法中的短滑翔攻击进行螺旋形优化,并结合鲸鱼优化算法改善天鹰优化算法局部最优停滞以及提高收敛速度。多种智能算法对比仿真和实验结果表明,相较于粒子群算法及鲸鱼优化算法,改进天鹰优化算法在静态、动态局部遮荫情况下均能更快、更平稳精准地搜索到全局最大功率点。

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柴琳(1979),男,博士,教授,主要研究方向为新能源发电预测和智能控制,
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姚天棋(1999),男,硕士研究生,主要研究方向为光伏发电功率预测,

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基于改进天鹰优化算法的光伏阵列多峰最大功率跟踪控制
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姚天棋 , 柴琳 , 肖凡 , 刘惠康 , 徐万万
热力发电 | 热能科学研究 2023,52(12): 98-105
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热力发电 | 热能科学研究 2023, 52(12): 98-105
基于改进天鹰优化算法的光伏阵列多峰最大功率跟踪控制
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姚天棋 , 柴琳 , 肖凡, 刘惠康, 徐万万
作者信息
  • 武汉科技大学信息科学与工程学院,湖北 武汉 430081
  • 姚天棋(1999),男,硕士研究生,主要研究方向为光伏发电功率预测,

通讯作者:

柴琳(1979),男,博士,教授,主要研究方向为新能源发电预测和智能控制,
Multi peak MPPT control of photovoltaic array based on improved aquila optimizer
Tianqi YAO , Lin CHAI , Fan XIAO, Huikang LIU, Wanwan XU
Affiliations
  • The College of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
出版时间: 2023-12-25 doi: 10.19666/j.rlfd.202303032
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光伏阵列在局部遮荫条件下,会产生多峰值的功率-电压(P-U)特性,为了迅速精准地实现最大功率点追踪以避免大量的能源损失,提出一种改进的天鹰优化算法,通过Circle混沌映射及反向学习策略合理分配初始种群位置,以缩短算法寻优时间,同时对天鹰优化算法中的短滑翔攻击进行螺旋形优化,并结合鲸鱼优化算法改善天鹰优化算法局部最优停滞以及提高收敛速度。多种智能算法对比仿真和实验结果表明,相较于粒子群算法及鲸鱼优化算法,改进天鹰优化算法在静态、动态局部遮荫情况下均能更快、更平稳精准地搜索到全局最大功率点。

局部遮荫  /  天鹰优化算法  /  光伏发电  /  最大功率点追踪

The photovoltaic array will produce multi-peak P-U characteristics under partial shading conditions. Aiming at the problem of how to quickly and accurately realize maximum power point tracking (MPPT) to avoid a large amount of energy loss, this paper proposes an improved aquila optimization (AO) algorithm, which uses Circle chaotic mapping and reverse learning strategy to reasonably allocate the initial population position, so as to shorten the optimization time of the algorithm. At the same time, spiral optimization is carried out for the short gliding attack in aquila optimization algorithm. The whale optimization algorithm is combined to improve local optimal stagnation and convergence speed. Simulations and experiments demonstrate that, in comparison to particle swarm optimization (PSO), whale optimization algorithm (WAO) and aquila optimization algorithm, the algorithm can search the global maximum power point with greater speed, accuracy and suppleness under both static and dynamic partial shading conditions.

partial shading  /  AO algorithm  /  photovoltaic power generation  /  MPPT
姚天棋, 柴琳, 肖凡, 刘惠康, 徐万万. 基于改进天鹰优化算法的光伏阵列多峰最大功率跟踪控制. 热力发电, 2023 , 52 (12) : 98 -105 . DOI: 10.19666/j.rlfd.202303032
Tianqi YAO, Lin CHAI, Fan XIAO, Huikang LIU, Wanwan XU. Multi peak MPPT control of photovoltaic array based on improved aquila optimizer[J]. Thermal Power Generation, 2023 , 52 (12) : 98 -105 . DOI: 10.19666/j.rlfd.202303032
均匀光照条件下,光伏阵列中的组件工作在相同的工况,其P-U特性只有1个最大值,即单峰特性,要实现最大功率点追踪(MPPT),使用传统的爬山法等即可。在实际生产状态下,受云层、建筑物、灰层等的影响,光伏板常处在不同工况条件下。部分受光照强度小的光伏板由电源转为负载,整个光伏板功率因此降低,还产生热斑效应。为保护光伏板,在光伏板两端安装了旁路二极管,以此短路相关电池,避免发热损坏光伏板。研究表明,此举虽然可以消除热斑效应,但却导致光伏阵列的多峰特性[1-2],因此传统MPPT算法已不再适用[3]。文献[4]提出一种改进变步长扰动法,该方法将光照强度变化作为一个动态因素,并代入一个修正系数,从而给出一个变步长确定方法,改善了误判和失效问题,但寻优时间过长。文献[5]给出了一种新的MPPT方法,它采用神经网络,可以有效克服常规扰动观察法存在的动态调节周期过长和稳态误差较大的缺陷,但是,由于其内部求解机制较为复杂,因此需要进一步改进。
近年来,智能算法成为解决光伏遮荫MPPT问题的有效方法[6-8]。文献[9]采用粒子群算法,将粒子起始高度离散在可能的峰值点电压处,有效避免了算法进入局部极值点,并且不会遗漏所有极值点,提高了解决遮荫问题的效率和准确性。文献[10]提供一种改进的自适应粒子群算法,它根据迭代次数自动更新算法参数,大幅提升了追踪时间误差。文献[11]通过logistic混沌序列的遍过性、随机性和变化规律,解决了“早熟”中存在的问题,进一步提升了跟踪精度;文献[12]采用莱维飞行技术,取代传统鲸鱼优化算法中参数的随机选择,从而更有效地实现了跟踪目标的最优化。文献[13]给出了一个全新的细菌觅食算法,它将全局学习机制和自适应步长方法有效结合,大大提高了跳出局部最优点的功能、计算精确度和收敛速率;同时,采用直接控制法模型和MPPT管理方法,可以有效避免光伏系统输出能量达到最高点时的能量震荡,从而进一步提高控制系统的产出效益。然而,在动态遮荫条件下,这种控制策略仍存在较大波动。文献[14]提出一个改良的樽海鞘群算法,它通过增加缩放因子和导入差分策略来改善控制系统性能,从而更好地满足动态遮荫条件下需求,但该算法存在一定的波动。
天鹰优化算法[15](aquila optimizer,AO)是Laith Abualigah等于2021年提出的一种优化方法,起源于自然界中天鹰捕食行为,拥有强大的全局搜寻力量、高效和迅速收敛等优点,可以有效提升搜索效率,从而更好地满足用户需求。文献[16]提供了一个全新的混合天鹰优化计算和哈里斯鹰优化(HHO)算法,通过调整非线性逃逸能量参数,并采用反向学习技术,有效限制局部最优解的出现,提升了算法优化性能,使其在寻优方面表现出色。文献[17]提出一种新的基于模糊信息粒度、基准模型优化选择的风速联合预报系统,它结合了神经网络、深度学习和先进的多目标优化器,提高了风速点预测和区间预测能力。
为进一步提高AO算法收敛速度、寻优精度和跳出局部最优点等能力,使其更适用于光照条件快速变化下的光伏阵列最大功率点追踪,本文通过Circle混沌映射及反向学习策略合理分配初始种群位置,以缩短算法寻优时间,同时对天鹰的短滑翔攻击进行螺旋形优化,并结合鲸鱼优化算法改善局部最优停滞和提高收敛速度。仿真及实验表明,本文提出的改进天鹰优化算法在光伏阵列多峰MPPT控制中具有良好的效果。
图1为光伏电池的等效电路模型。根据图1,将负载电路连接到光伏太阳能电池上,通过光生电流原理,获得光伏太阳能电压及其输出特性方程。
图1可得,光伏太阳能输出特性方程为:
IPV=IphI0{exp[q(U+RsI)nkT]1}U+RsTRsh
在Simulink仿真平台上,建立一个3×14的光伏阵列模型,各光伏组件的具体参数为:额定功率240 W,开路电压Uoc 37.48 V,短路电流Isc 8.68 A,最大功率点电压Um 29.89 V,最大功率点电流Im 8.07 A。采用S1S2S3 3种不同的辐照度模拟不同阴影条件,输出特性曲线如图2所示。
图2中:标况峰值为10 002 W;遮荫条件1为温度T=25 ℃,S1=0.6、0.8、1.0 kW/m²,其峰值点为6 681 W;遮荫条件2为T=25 ℃,S2=0.5、0.7、1.0 kW/m²,其峰值点为5 629 W;遮荫条件3为T=25 ℃,S3=0.5、0.4、1.0 kW/m²,其峰值点为4 510 W。
根据图2,在遮荫条件下,该光伏阵列的P-U特性表现出多峰值特征。然而,由于第1部分功率点不是全局功率点,因此P&O等方法无法追踪到最大值[18-19]。实际上外界环境时常发生变化,因此研究适用于局部遮荫的光伏MPPT具有非常重要的现实意义。
天鹰优化算法是根据天鹰狩猎和捕食开发的一种优化算法。该算法天鹰有4种捕食方式,在算法前期(t≤2T/3,T为最大迭代次数),由捕食方式1(X1)和方式2(X2)更新天鹰位置;在算法后期(t>2T/3),由方式3(X3)和方式4(X4)更新天鹰位置。候选解的种群初始位置由式(2)设置。
X=[x1,1x1,jx1,Dimxi,1xi,jxi,DimxN,1xN,jxN,Dim]
Xij=rand×(UBjLBj)+LBj,i=1,2,,N;j=1,2,,Dim
式中:xi, j为第i个解的位置;N为种群的总数;Dim为问题的维度大小;UBj、LBj分别为候选解大小的上界和下界。
方式1(X1):在高空飞行时,天鹰通过垂直弯腰选择狩猎区域,即解的探索空间。该行为可表示为:
X1(t+1)=Xbest(t)×(1tT)+                (XM(t)Xbest(t))×rand
XM(t)=1Ni1NXi(t),j=1,2,,Dim
式中:Xbest(t)为当前搜索的最优位置,表示探索的解空间;XM(t)为解的平均值。
方式2(X2):高空预备攻击。这种行为在数学上可表达为:
X2(t+1)=Xbest×Levy(D)+XR(t)+                (yx)×rand
其中Levy(D)为Levy飞行分布函数:
Levy(D)=s×u×σ|v|1β
σ=(Γ(1+β)×sinπβ2)(Γ(1+β2)×β×2(β12)))
xy生成螺旋:
y=r×cos(θ)
x=r×sin(θ)
螺旋半径r
r=r1+U×D1
螺旋角度θ
θ=ω×D1+θ1
θ1=3×π2
对于固定的搜索周期数,r1Uω是固定值,D1是Dim,显然当Dim=1时,r为一恒定值,导致原有的螺旋攻击行为变成单一的绕圈动作,大大降低了捕猎成功的可能性。
方式3(X3):下降飞行攻击,可表示为:
X3(t+1)=(Xbest(t)XM(t))×αrand+                ((UBLB)×rand+LB)×δ
方式4(X4):行走和抓取猎物,可表示为:
X4(t+1)=QF×Xbest(t)(G1×X(t)×rand)G2×Levy(D)+rand×G1
QF(t)=t2×rand1(1T)2
G1=2×rand1
G2=2×(1tT)
式中:QF为质量函数;G1为AO的各种运动;G2为AO的飞行斜率。
从式(4)—式(18)来看,X1X4会向0收敛,X3会收敛到常数,只有X2勉强会收敛至最优解,故AO算法易陷入局部最优[20]
由于天鹰优化算法初始化种群是根据式(2)随机生成的,这种方式没有任何的先验条件可以使用,生成的种群很可能没有覆盖目标位置,甚至距离目标位置十分遥远,故在一定程度上会影响MPPT的效率。利用Circle映射来构建种群,以便完成初始化处理,标准Circle映射为:
xi+1=mod(xi+0.2(0.52π)sin(2πxi),1)
根据文献[21]可以推测,光伏阵列最大功率点处的电压处在开路电压的70%~80%,因此提出一种结合反向学习[22]的Circle混沌映射,其生成种群及标准Circle映射初始化效果对比如图3所示,既大体满足了均匀分布,又达到了在0.7~0.8相对多分布的目的。
反向学习数学表达式为:
x'(i)=a+bx(i)
式中:ab分别为x(i)的上限和下限。
狭域勘探X2是前期探索的重要组成部分,是继扩大勘探X1后对目标猎物选定区域的局部探索,也是天鹰优化算法最常用的方法。然而式(6)并不能很好地完成局部探索。就天鹰的短滑翔攻击,即(yx)×rand,在式(12)中,由于MPPT为一维寻优,故D1=1,θ成为一个定值,导致狭域勘探X2的短滑翔攻击失去了其螺旋形行为,捕捉猎物的成功率随之降低。考虑到猎物逃跑可能不会在一个方向上,故在此引入随机变化的θ,即:
θ=rand×π/2
并调整固定值r为随迭代次数t自适应减小的变量,则有:
r'=r×(1t/T)
此举使得天鹰更好地调整自身位置,从而跟紧逃跑的猎物,以提高算法的局部搜索性能。
天鹰优化算法在其搜索机制上存在一定的局限性,如局部最优停滞和收敛速度[23]。这是一个几乎所有优化问题都面临的普遍问题,可以通过使用辅助搜索工具增强优化器的搜索过程来解决,如与另一个优化器混合使用或应用其他搜索技术来提高优化器的搜索能力。鲸鱼优化算法(WOA)可用作天鹰优化算法局部搜索,来提高其解决不同优化问题能力,从而为改进天鹰优化算法增加灵活性。
天鹰优化算法在光伏MPPT一维寻优应用中,失去了其螺旋形攻击行为。因此在整个IAO的优化过程中,使用WOA的螺旋行为来更新解决方案,改进对原始AO的扩展开发。在这方面,AO的扩展开发方程(式(14)),被WOA的螺旋方程替换。
WOA的螺旋方程为:
X(i+1)=Dis×ebl×cos(2πl)+Xbest(t)
式中:Dis为Xi(t)和Xbest(t)之间的距离。
IAO算法光伏局部遮荫MPPT控制流程如图4所示。由图4可见:在MPPT控制流程中,首先,通过Circle混沌映射和反向学习策略进行种群初始化,以确定其参数值;其次,检测输入电压和输入电流,并通过适应度函数测算输出功率;最后,记录个体和种群的最佳定位,以实现对天鹰种群的有效控制。当种群所有个体适应度值P(i)(i=1…nn为种群个数)与最大预测概率值Pbest的差值小于最大功率预测值的0.5%时,停止迭代,输出最优值;否则,再根据算法更新个体位置,完成迭代,最后确定MPP;在动态遮荫实验时,在光伏系统平稳输出的时候,若某一时刻光照突变,算法检测到当前输出功率Pprep与之前最大预测功率Pbest的差值大于Pbest的0.5%,则令t=0,重启算法,再次寻优。
根据第1节所选取实验对象,光伏系统MPPT模型如图5所示。Boost电路中,Cin=1×10–4 F,Cout=2.8×10–4 F,L=1×10–4 h,Rload=2 Ω。
为验证本文算法的有效性,将本文(IAO)算法与改进的PSO(IPSO)算法、改进的WAO(IWAO)算法[24]和AO算法进行了比较。
恒温条件为25 ℃,遮荫条件分别为800、600、1 000 W/m2图6为不同算法静态局部遮阴结果对比。由图6可知,在遮荫条件下,IPSO算法、IWAO算法和AO算法经多次振荡跳出局部最优点,相继在60 ms收敛在6 680 W,8 ms收敛在6 681 W以及7 ms收敛在6 681 W处,可以明显看出,失去螺旋形短滑翔攻击的AO算法跳出局部最优点弱,且寻优存在一定的误差。本文提出的IAO算法跳出局部最优点能力最强,收敛速度最快,在2.7 ms时即完成了全局寻优,收敛至P=6 682 W,且无明显波动,平稳性好。
图7为不同算法动态局部遮荫结果对比。
图7中:初始辐照度为遮荫条件2为500、700、1 000 W/m2,在0.1 s切换到遮荫条件3为500、300、1 000 W/m2。由图7可见:IPSO算法经多次迭代并未完全收敛,仍存在一定的偏差和波动;AO和IWAO算法的寻优速度慢,且收敛时有大的振荡。本文所提出的IAO算法波动很小,在极短的时间内就重新搜索到新的最大功率点,并平稳输出。
遮荫条件2下,由图7b)可见:IWAO算法的收敛速度较慢,在跳出第2个局部最优点时用时超过1 ms,但顺利在7.6 ms收敛到最大功率点5 629 W;AO算法的寻优速度较快,但很快在3 ms陷入局部最优点,但由于其拥有较强的全局勘探能力,在经过多次迭代在6.8 ms收敛到最大功率点5 629 W;IWAO、AO算法都有着不错的动态响应,在8 ms内都收敛到最大功率点,但是IAO算法不仅收敛速度快,跳出局部最优点能力强,还避免了局部最优停滞,在3 ms内就率先收敛到最大功率点5 629 W。
图7c)可见:IPSO算法在0.13 s后收敛,陷入局部最优值P=4 499 W,IWAO算法用时20 ms收敛到新的最大功率点P=4 510 W;AO算法用时40 ms搜索到新的最大功率点P=4 507 W,陷入局部最优;而IAO算法仅用时8 ms即收敛到新的最大功率点P=4 510 W,可见IWAO算法在光照突变情况下的寻优性能较优,虽然突变时功率下降较大,但其重新搜索新的最大功率点速度快;而AO算法在应对光照突变情况下不仅波动大,且未收敛到最大功率点;IAO算法不仅重新搜索最大功率点速度快,且收敛平滑波动小,稳定输出功率4 510 W。
采用武汉科技大学微电网实验平台(图8)。光伏阵列是由42块CLS-240P型号电池组成3×14阵列。STMS320F28335作为下位机的主控芯片,在上位机中运行算法,将生成的占空比数据通过串口传输到下位机,从而实现对开关管的控制,以确保系统的正常运行,实现最大功率点跟踪。
在实验平台上进行动态局部遮荫实验,图9为IAO算法实验追踪数据。
图9可见:IAO算法实验在3.4 ms收敛到最大功率点5 629 W,与仿真结果相比,实验追踪曲线收敛用时多0.7 ms;在光照突变的情况下,实验追踪曲线有一定波动,在0.1 s时辐照度突变,经5.5 ms其功率下降到4 272 W,比仿真下降的最低点低43 W,经13 ms重新搜寻到新的最大功率点,收敛至4 510 W平稳输出。由于实验工况更为复杂,仿真模型考虑因素不全,且实际通信信号存在不确定的干扰,导致实验结果与仿真有些许差距,但不影响实际的应用。
综上,本文提出IAO算法在静、动态遮荫条件下性能较优,不仅在极短时间内重新找到最大功率点,还克服了光照条件突变情况下功率振荡过大的问题。
针对局部遮荫等外部干扰条件,传统的MPPT算法失效以及基础的智能算法收敛速度慢、追踪精度低,易产生振荡等问题。本文将最新的AO算法运用到光伏MPPT中,针对其中存在的问题,进行局部优化,采用WOA算法的螺旋寻优,提出一种改进的IAO算法,仿真和实验表明,与AO算法相比,IAO算法的收敛速度更快,寻优精度更高,跳出局部最优点能力更强,输出更稳定,且对太阳辐照度的突变有较强的适应性。
  • 国家自然科学基金面上项目(51877161)
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2023年第52卷第12期
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doi: 10.19666/j.rlfd.202303032
  • 接收时间:2023-03-02
  • 首发时间:2026-01-26
  • 出版时间:2023-12-25
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  • 收稿日期:2023-03-02
基金
The General Program of National Natural Science Foundation of China(51877161)
国家自然科学基金面上项目(51877161)
作者信息
    武汉科技大学信息科学与工程学院,湖北 武汉 430081

通讯作者:

柴琳(1979),男,博士,教授,主要研究方向为新能源发电预测和智能控制,
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
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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