Article(id=1197502602775675526, tenantId=1146029695717560320, journalId=1189621681917173762, issueId=1197502600254894452, articleNumber=null, orderNo=null, doi=10.19620/j.cnki.1000-3703.20240648, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=null, receivedDateStr=null, revisedDate=1725897600000, revisedDateStr=2024-09-10, acceptedDate=null, acceptedDateStr=null, onlineDate=1763436469023, onlineDateStr=2025-11-18, pubDate=1740326400000, pubDateStr=2025-02-24, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1763436469023, onlineIssueDateStr=2025-11-18, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1763436469023, creator=13701087609, updateTime=1763436469023, updator=13701087609, issue=Issue{id=1197502600254894452, tenantId=1146029695717560320, journalId=1189621681917173762, year='2025', volume='', issue='2', pageStart='1', pageEnd='62', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1763436468423, creator=13701087609, updateTime=1763437713537, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1197507822717026735, tenantId=1146029695717560320, journalId=1189621681917173762, issueId=1197502600254894452, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1197507822717026736, tenantId=1146029695717560320, journalId=1189621681917173762, issueId=1197502600254894452, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=37, endPage=45, ext={EN=ArticleExt(id=1197502603966857867, articleId=1197502602775675526, tenantId=1146029695717560320, journalId=1189621681917173762, language=EN, title=Parameter Optimization Design of CLLLC Bidirectional Resonant Converter Based on DBO-FHA, columnId=null, journalTitle=Automobile Technology, columnName=null, runingTitle=null, highlight=null, articleAbstract=

To address the challenges associated with the complex steps and inability to identify the optimal hardware parameters of the CLLLC converter when designing parameters by using the Fundamental Harmonic Analysis (FHA) method, this paper proposes a CLLLC converter parameter design and optimization approach based on the fundamental wave analysis method and the Dung Beetle Optimizer (DBO) algorithm. Firstly, the FHA is employed to derive the design boundary of the converter parameters as the design constraints. Secondly, the efficiency function of the converter is established according to the relationship between converter efficiency and hardware parameters. Then, the DBO algorithm is used to optimize the objective function within the design constraints to obtain the hardware parameter values at the best efficiency point. The experimental results indicate that the efficiency of the designed prototype can reach 97%, further proving feasibility of this scheme.

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针对采用基波分析(FHA)法设计CLLLC变换器参数时,步骤繁杂、无法找到变换器最优硬件参数的问题,提出一种基于基波分析法和蜣螂优化(DBO)算法的CLLLC变换器参数设计和寻优策略。通过FHA推导出变换器参数的设计边界,并将其作为设计约束条件;根据变换器的转换效率与硬件参数间的关系,建立变换器工作效率函数;利用DBO算法在设计约束范围内,对目标函数进行寻优,获得最佳效率点的硬件参数。试验结果表明:采用所提出方案设计制作的样机效率可达97%,进一步证明了该方案的可行性。

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参数 取值 参数 取值
输入电压/V 350~300 谐振频率/kHz 200
输出电压/V 250 运行频率/kHz 150~300
最大输出功率/kW 1 变压器变比 1.4
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CLLLC谐振变换器样机规格

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参数 取值 参数 取值
输入电压/V 350~300 谐振频率/kHz 200
输出电压/V 250 运行频率/kHz 150~300
最大输出功率/kW 1 变压器变比 1.4
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参数 DBO-FHA FHA
电感比值 2.454 6 2
原边谐振电感/μH 37.602 30.35
副边谐振电感/μH 19.185 15.48
励磁电感/μH 92.298 60.7
原边谐振电容/nF 16.841 40.9
副边谐振电容/nF 33.008 80.164
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CLLLC谐振变换器样机参数设计

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参数 DBO-FHA FHA
电感比值 2.454 6 2
原边谐振电感/μH 37.602 30.35
副边谐振电感/μH 19.185 15.48
励磁电感/μH 92.298 60.7
原边谐振电容/nF 16.841 40.9
副边谐振电容/nF 33.008 80.164
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元件 制造商 型号
谐振电感 美磁 PQ3535
谐振电容 科雅 MMKP
变压器 美磁 PQ5050
MOSFET 科瑞 C3M0040120K
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CLLLC谐振变换器样机关键器件

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元件 制造商 型号
谐振电感 美磁 PQ3535
谐振电容 科雅 MMKP
变压器 美磁 PQ5050
MOSFET 科瑞 C3M0040120K
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基于DBO-FHA的双向CLLLC谐振变换器参数优化设计*
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马帅旗 , 贺海育 , 任思嘉 , 赵佳瑶 , 张力蕾
汽车技术 | 2025,(2): 37-45
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汽车技术 | 2025, (2): 37-45
基于DBO-FHA的双向CLLLC谐振变换器参数优化设计*
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马帅旗, 贺海育, 任思嘉, 赵佳瑶, 张力蕾
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  • 陕西理工大学电气工程学院,汉中 723000
Parameter Optimization Design of CLLLC Bidirectional Resonant Converter Based on DBO-FHA
Shuaiqi Ma, Haiyu He, Sijia Ren, Jiayao Zhao, Lilei Zhang
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  • Shaanxi University of Technology, Hanzhong 723000
出版时间: 2025-02-24 doi: 10.19620/j.cnki.1000-3703.20240648
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针对采用基波分析(FHA)法设计CLLLC变换器参数时,步骤繁杂、无法找到变换器最优硬件参数的问题,提出一种基于基波分析法和蜣螂优化(DBO)算法的CLLLC变换器参数设计和寻优策略。通过FHA推导出变换器参数的设计边界,并将其作为设计约束条件;根据变换器的转换效率与硬件参数间的关系,建立变换器工作效率函数;利用DBO算法在设计约束范围内,对目标函数进行寻优,获得最佳效率点的硬件参数。试验结果表明:采用所提出方案设计制作的样机效率可达97%,进一步证明了该方案的可行性。

基波分析法  /  蜣螂优化算法  /  双向谐振变换器  /  参数优化

To address the challenges associated with the complex steps and inability to identify the optimal hardware parameters of the CLLLC converter when designing parameters by using the Fundamental Harmonic Analysis (FHA) method, this paper proposes a CLLLC converter parameter design and optimization approach based on the fundamental wave analysis method and the Dung Beetle Optimizer (DBO) algorithm. Firstly, the FHA is employed to derive the design boundary of the converter parameters as the design constraints. Secondly, the efficiency function of the converter is established according to the relationship between converter efficiency and hardware parameters. Then, the DBO algorithm is used to optimize the objective function within the design constraints to obtain the hardware parameter values at the best efficiency point. The experimental results indicate that the efficiency of the designed prototype can reach 97%, further proving feasibility of this scheme.

First Harmonic Approximation (FHA)  /  Dung Beetle Optimizer (DBO)  /  CLLLC resonant converter  /  Parameter optimization
马帅旗, 贺海育, 任思嘉, 赵佳瑶, 张力蕾. 基于DBO-FHA的双向CLLLC谐振变换器参数优化设计*. 汽车技术, 2025 , (2) : 37 -45 . DOI: 10.19620/j.cnki.1000-3703.20240648
Shuaiqi Ma, Haiyu He, Sijia Ren, Jiayao Zhao, Lilei Zhang. Parameter Optimization Design of CLLLC Bidirectional Resonant Converter Based on DBO-FHA[J]. Automobile Technology, 2025 , (2) : 37 -45 . DOI: 10.19620/j.cnki.1000-3703.20240648
在电动汽车车载充电机的应用中,变换器需灵活适应充电与放电两种方式的功率传输需求。作为大功率隔离型双向DC/DC变换器,CLLLC双向谐振变换器凭借高效率[1]、高功率密度[2-3]等优点,广泛应用于新能源汽车。
目前,对于双向CLLLC变换器的研究中,廖嘉睿等[4]结合时域方程和拟合方法优化同步整流策略,进一步提升了CLLLC变换器的工作效率。周国华等[5-6]利用控制策略、拓扑结构等方式拓展CLLLC变换器的输出电压范围,同时优化回流功率与电流应力。
鉴于变换器的性能及效率下限由硬件参数决定,可结合增益曲线,利用基波分析(First Harmonic Approximation,FHA)法对变换器的硬件参数进行设计。曲璐等[7]基于FHA对谐振网络进行建模,分析了关键参数变换对变换器的影响,并给出变换器匝数比和谐振电容取值的最佳范围,但未对变换器的效率进行建模。许景慧等[8]通过分析CLLLC变换器的软开关条件,提出了参数设计方法及详细步骤。陈启超等[9]基于FHA引入谐振腔电流,论证了变换器效率与谐振腔电流间的关系,在参数设计时引入变换器效率。
为了精确分析CLLLC变换器的损耗,Zhao等[10]采用谐振腔均方根电流的平方和表征变换器损耗,指导变换器的参数设计。由于约束条件及目标函数均为高阶非线性方程,所以迭代法无法直接寻求函数最优解,需引入智能优化算法,同时避免了复杂的运算。江友华等[11-12]以软开关条件、直流电压增益为约束条件,以变换器损耗为目标函数,利用量子粒子群和布谷鸟算法对变换器参数进行寻优,简化变换器参数计算,并提高参数精度和变换器效率。
因此,针对CLLLC变换器参数设计中未考虑硬件参数对于变换器效率的影响及参数寻优的问题,本文构建CLLLC变换器的效率曲面,并结合基波分析法所推导的设计约束引入蜣螂优化(Dung Beetle Optimizer,DBO)算法进行CLLLC变换器的参数优化设计,最后通过样机试验进一步证明提出方案的有效性。
CLLLC变换器是在LLC谐振变换器的副边增加一组电容-电感,继承了LLC谐振变换器软开关的同时,能够进行双向传输功率,从而降低开关元件的功率损耗。在零电压开关(Zero Voltage Switch,ZVS)区域中,开关器件与谐振腔的电压、电流的典型波形如图1所示。其中, v S i 1 v S i 3为原边开关管 S i 1 S i 3的触发信号(由于 S i 1 S i 2同时导通, S i 3 S i 4同时导通,因此仅分析 S i 1 S i 3)。 v C r 1为变换器原边谐振电容电压波形; i p为变压器原边电流波形; i m为变压器原边励磁电感电流波形; i S i 1 i S i 3为开关管电流波形; i s为变换器副边电流波形; i S o 1 i S o 3为副边开关管的电流波形。
t a~ t e时刻对应的变换器模态如图2所示。图2a中, [ t a : t b ]时刻为死区时间,变换器原边开关管 S i 1 S i 2断开,励磁电流 i m S i 1 S i 2的结电容放电结束后,且 S i 3 S i 4未连通,则通过 S i 1 S i 2的体二极管续流。当 i m= i p,变压器副边电流 i s=0,变压器原边励磁电感 L m参与谐振,此时谐振腔为三元谐振,负载端由输出电容供电。
图2b中,在 [ t b : t d ]时刻,变换器原边开关管 S i 3 S i 4导通, S i 1 S i 2断开。此时 i m< i p,电源电压通过 S i 3 S i 4接入谐振腔,迫使谐振腔电流过零点。由于输出电容和负载上电压不变,变压器副边电压将钳位原边励磁电感电压,此时励磁电感 L m退出谐振,由原边谐振电感 L r p、谐振电容 C r p构成二元谐振。
图2c中, [ t d : t e ]时刻由于 i p为类正弦电流,在 t d时刻,当 i m= i p时,励磁电感 L m再次参与谐振,使得 i p的方向不变。此时为全桥开关管的死区时间,开关管全部断开, i p S i 1 S i 2的结电容充电,对 S i 3 S i 4的结电容放电,即软开关现象。当所有开关管结电容完成充/放电后,若死区未结束,则通过开关管 S i 3 S i 4的体二极管续流,此时为 [ t a : t b ]时刻模态,后半周期的模态与前半周期相同。
由于谐振腔电流为类正弦,建立精准的时域模型运算量较大,而FHA中仅有基波进行能量传输,因此,结合图2工作模态,基于FHA的CLLLC变换器建立等效模型,如图3所示。其中, u i为原边的全桥逆变网络输出; L r p C r p分别为原边谐振电感和电容; L m为变压器励磁电感;等效电阻 R e q = n 2 8 π 2 V o u t I o u t n为变压器变比, V o u t I o u t分别为变换器输出电压和电流。
根据等效电路,得到谐振腔电压增益公式为[13]
M ( f n , Q , k ) = 1 + 1 k - 1 k f n 2 2 + Q 2 k 2 a 2 a = 2 k + 1 f n - 2 k + 2 f n + 1 f n 3 Q = Z 0 R e q = π 2 8 I o u t V o u t 1 n 2 Z 0 = π 2 8 P o u t ( n V o u t ) 2 Z 0 Z 0 = L r p C r p ,   f n = f s f r 1 , k = L m L r p
式中:fn f r 1分别为标幺开关频率和第一谐振频率,k为电感比,Q为品质因数,Z0为特征阻抗,Pout为变换器输出功率。
谐振腔电压增益 M f n k Q共同约束,鉴于CLLLC变换器为对称结构,所以正、反向运行时,使用同一簇增益曲线。当品质因数Q=0.4,电感比k=7时,电压增益曲线簇如图4所示。
图4a中,当 k较小时,在较窄的频率范围内能够得到较高的电压增益,即变换器励磁电感 L m减小,谐振腔内的无功电流循环加快,导致CLLLC变换器的无功损耗增加。图4b中,当 Q逐渐增加,增益曲线会跨过纯阻性边界,进入容性区域,此时两个谐振频率点间不存在单调性。
从上述分析可知,Q与变换器的工况紧密相关,在设计变换器硬件参数中调整参数k,选取合适的 k Q使CLLLC变换器满足以下条件:
a. 符合电压增益,满足变换器需求。
b. 保证全负载范围内的软开关条件,使谐振腔式中呈现感性或阻性。
c. 变换器保持较高的工作效率。
为了满足CLLLC变换器的软开关特性及电压增益设计需求,计算变换器的阻性运行边界处Q的最大值,并将其作为边界。根据变换器基波等效电路得到谐振腔的输入阻抗:
Z i n = j ω S L r p - j 1 ω S C r p + j ω S L m ( R e q + j ω S L r p - j 1 ω S C r p )
式中: ω S为开关角频率, j为虚数。
Z i n的虚部为0,得到谐振腔在纯阻性边界处 Q = f n ( 1 - f n 2 ) 2 k + 1 ) f n 2 - 1 所以电压增益临界时,品质因数最大值为:
Q m a x = 1 2 k + 1 4 1 - 1 2 k + 1 ( 2 k + 1 - 1 )
联立式(1)~式(3),正向3项变换器参数约束[14]为:
L r p 4 Q m a x V i n 2 / ( π 3 f r 1 P o u t ) L r p 4 V i n 2 k + 1 / ( π 3 P o u t k f r 1 ) L r p - V o V i n - V o V i n f n m i n 2 + f n m i n 2 k - V o V i n f n m i n 2 k π 3 f r 1 P o u t ( f n m i n 2 - 1 ) ( 2 f n m i n 2 k + f n m i n 2 - 1 ) 4 V o V i n V i n 2 f n m i n V o V i n f n m i n 2 - V o V i n + f n m i n 2 k + V o V i n f n m i n 2 k
式中:VinVo分别为CLLLC变换器的额定输入和输出电压,fnmin为变换器硬件支持的最小开关频率。
同理,反向3项变换器参数约束为:
$\left\{\begin{array}{l} L_{\mathrm{rp}} \leqslant 4 Q_{\max } V_{\text {out }}^{2} /\left(\pi^{3} f_{\mathrm{r} 1} R_{\text {out }}\right) \\ L_{\mathrm{rp}} \leqslant 4 V_{\text {out }}^{3} \sqrt{k+1} /\left(\pi^{3} f_{\mathrm{r} 1} P_{\text {out }} V_{\text {in }} k\right) \\ L_{\mathrm{rp}} \leqslant \frac{4 V_{\text {out }}^{2} k \sqrt{\frac{1}{\left(\frac{V_{\mathrm{o}}}{V_{\text {in }}}\right)^{2}}-\left(\frac{1}{k}+1-\frac{1}{f_{n \min }^{2} k}\right)^{2}}}{f_{\mathrm{r} 1} P_{\text {out }} \pi^{3}\left[\frac{1}{f_{n \min }^{3}}-\frac{2 k+2}{f_{n \min }}+f_{n \min }(2 k+1)\right]} \end{array}\right.$
由于上述参数约束仅包含变换器的具体工况参数,所以可将参数设计视为谐振电感Lrp的设计,从而降低变换器整体参数设计的复杂度与运算量。虽然在约束内均可满足变换器的软开关条件和电压增益需求,但变换器性能较差,其电能的转换效率较低。因此,可通过引入变换器的效率曲面,控制转换效率,再进行参数设计。
在CLLLC变换器中,主要的回路损耗由开关管的导通损耗、变压器以及谐振电感绕组的等效直流电阻损耗以及谐振电容的等效串联电阻损耗等组成[15],得到变换器的总损耗为:
P l o s s = I L p 2 R l o s s I L p = U p Z i n ¯
式中: P l o s s为变换器的总功率损耗, I L p为变换器的谐振腔电流, U p为变换器原边桥臂中点电压, R l o s s为变换器回路中的等效电阻。
变换器的传输效率为:
η = P o u t P o u t + P l o s s = 1 1 + R l o s s R e q Z i n 2 M 2 = 1 1 + R l o s s α k ,   f n + β ( k ,   f n , Q ) γ ( k ,   f n , Q ) ε ( k ,   f n , Q , R e q ) ς ( k ,   f n , Q ) P o u t = ( n 2 U s 2 ) / R e q = M 2 ( U p 2 / R e q )
其中, α k ,   f n = 1 + 1 k - 1 k f n 2 2
β ( k ,   f n , Q ) = Q k 2 2 k + 1 ) f n - 2 k + 2 f n + 1 f n 3 2 γ ( k ,   f n , Q ) = 1 + f n k Q + f n Q - Q / f n 2 2
ε ( k ,   f n , Q , R e q ) = f n 4 k 4 Q 4 R e q + Q 2 R e q ( k + 1 ) f n 2 - 1 2
ς ( k ,   f n , Q ) = 2 k + 1 ) Q 2 f n + 1 - ( 2 k + 2 ) Q 2 f n + Q 2 f n 3 2
式中:Pout为等效负载Req的功率,US为变换器副边桥臂中点电压。
此时,变换特征阻抗为 Z 0 = 2 π L r p f r 1。通过式(1)改写品质因数 Q = π 3 4 L r p f r 1 P o u t ( M V i n ) 2,得到由电感比 k和谐振电感值 L r p约束的电压增益 M ( f n , L r p , k )。将其代入式(7),得到:
η = I ( f n , L r p , k ) = 1 R l o s s δ ( k ,   f n ) + λ ( f n , L r p , k ) κ ( f n , L r p , k ) ο ( f n , L r p , k ) ϖ ( f n , L r p , k ) 2 V i n 2 5 + θ ( f n , L r p , k ) + 1
其中,

δ ( k ,   f n ) = 1 k - 1 f n 2 k + 1 2 λ ( f n , L r p , k ) = f r 1 2 L r p 2 P o 2 π 6 1 f n 3 - 2 k + 2 f n + f n 2 k + 1 ) 2 1 2 16 k 2 V i n 4 4 2 κ ( f n , L r p , k ) = f n f r 1 L r p P o π 3 1 3 - f r 1 L r p P o π 3 1 4 f n V i n 2 5 + f n f r 1 k L r p P o π 3 1 3 + 1 2 ο ( f n , L r p , k ) = f r 1 2 L r p 2 P o π 4 ( ( k + 1 ) f n 2 - 1 ) 2 ϖ ( f n , L r p , k ) = f r 1 2 L r p 2 P o 2 π 6 1 2 16 f n 3 V i n 4 4 2 - f r 1 2 L r p P o 2 π 6 2 k - 2 ) 1 2 2 - 1 f n +                                                     f n f r 1 2 L r p 2 P o 2 π 6 2 k + 1 ) 1 2 2 2 1 θ ( f n , L r p , k ) = f n 4 f r 1 4 k 4 L r p 4 P o 3 π 10 1 3 32 V i n 6 4 3

其中,

1 = 13 + 4 f n 5 k V i n 2 + 2 f n 5 V i n 2 - 4 f n 3 k V i n 2 - 4 f n 3 V i n 2 + 2 f n V i n 2 2 = 16 V i n 4 4 2 3 = 4 V i n 2 5 4 = a b 2 + 22 5 = c d 2 + 22

7 = 6 f n 4 f r 1 k L r p P o π 3 8 = 3 f n 6 f r 1 k L r p P o π 3

9 = 3 f n 2 f r 1 k L r p P o π 3 10 = 3 f n 4 f r 1 L r p P o π 3

11 = 3 f n 2 f r 1 L r p P o π 3 12 = f n 6 f r 1 L r p P o π 3

13 = 2 f n 5 k 2 V i n 2 14 = f r 1 L r p P o π 3

15 = f r 1 L r p P o f n 4 k 2 π 3 16 = f r 1 L r p P o f n 4 k π 3

17 = f r 1 L r p P o f n 6 k π 3 18 = f r 1 L r p P o f n 2 k π 3

19 = f r 1 L r p P o f n 4 π 3 20 = f r 1 L r p P o f n 2 π 3

21 = f r 1 L r p P o f n 6 π 3 22 = f n 5 k 2 V i n 2

a = 13 - 14 - 11 + 10 - 12 - 9 + 7 - 8 + 6

b = 13 + 14 + 11 - 10 + 12 + 9 - 7 + 8 - 6

c = - 17 - 21 + 13 + 15 + 16 + 19 - 18 - 20 - 14

d = 17 + 21 + 13 - 15 - 16 - 19 + 18 + 20 + 14

最后,以输入350/300 V、输出250 V、额定功率1 kW、谐振频率250 kHz的变换器参数代入式(8)。在 f n范围为0.75~1 Hz的效率曲面如图5所示。
图5可知,当 f n逐渐降低时,效率等高线将向右上方移动,即同一变换器硬件参数点(谐振电感值,电感比)处的变换器工作效率降低,应该利用最严苛工况( f n=0.75 Hz)进行参数计算,得到变换器最佳效率。
由于变换器转换效率的表达式阶数较高,无法通过求导得到极值点,因而引入蜣螂优化算法,对 f n=0.75 Hz时变换器的转换效率进行寻优。
蜣螂优化算法是一种受自然界蜣螂种群行为启发的智能优化算法,有着收敛迅速和精度高等优点,主要由滚球蜣螂、繁殖蜣螂、觅食蜣螂以及偷窃蜣螂组成[16]。其中,每个蜣螂位置即对应一个变换器的硬件参数解,即谐振电感值 L r p和电感比 k,蜣螂种群的最优位置即为转换效率的目标函数值。
在自然界中,蜣螂在滚球过程中沿直线运动,且蜣螂存在趋光行为,所以使用线性函数描述该运动:
x i ( t + 1 ) = x i ( t ) + α k b x i ( t - 1 ) + b Δ x Δ x = x i t - X w α { - 1,1 }
式中:xi(t)为当前蜣螂的位置, α=-1、 α=1分别为蜣螂偏离/未偏离初始方向,t为当前的迭代次数,kb=0.1为缺陷因子,b=0.3为常数,Xw为当前次搜寻的全局最差值, Δx为光源距离。
当蜣螂遇到障碍物时,将通过跳舞的行为进行位置更新 x i ( t + 1 ) = x i ( t ) + t a n ( θ ) x i ( t ) - x i ( t - 1 ) θ [ 0 , π ]。因此,可利用tan(θ)确认蜣螂的滚动方向。
蜣螂选择在安全区域进行产卵,可利用该繁殖行为对蜣螂的寻优边界进行约束:
L b * = m a x ( X * × ( 1 - R ) ,   L b ) U b * = m i n ( X * × ( 1 + R ) , U b ) R = 1 - t T m a x
式中:LbUb分别为寻优问题的上、下界, L b * U b *分别为产卵区域的上、下界,X*为当前搜寻的最优值,Tmax为最大迭代次数。
为了避免算法陷入局部最优的问题,卵球的位置随迭代动态变化,产卵蜣螂的位置更新为 X i ( t + 1 ) = X * + b 1 ( X i ( t ) - L b * ) + b 2 ( X i ( t ) - U b * ),其中, b 1 b 2为1×d的随机向量。
为了引导蜣螂在最优区域觅食,则该区域为:
L b b = m a x ( X b × ( 1 - R ) ,   L b ) U b b = m i n ( X b × ( 1 + R ) , U b )
式中: X b为当前的全局最优值, L b b U b b分别为当前觅食区域的上、下界。
觅食蜣螂的位置更新为 x i ( t + 1 ) = x i ( t ) + C 1 ( x i ( t ) - L b b ) + C 2 ( x i ( t ) - U b b ) C 2 [ 0,1 ]。其中,C1为服从正态分布的随机数,C2为1×d的向量。
为了模仿蜣螂从其他蜣螂处偷窃粪球行为,其位置更新为 x i ( t + 1 ) = X b + S g x i ( t ) - X * + x i ( t ) - X b。其中,S=0.5,g为随机变量。
根据正、反向CLLLC变换器谐振电感值 L r p约束条件,对寻优问题的上、下界从常量转变为约束函数,并在算法迭代中实时更新。分别将设计约束范围内的 L r p k代入式(8),得到当前硬件参数下的变换器效率。在迭代过程中,若超出蜣螂运动边界,则将其固定至边界;若未超出边界,蜣螂继续参与运动,并在每次迭代后,对比目标函数,找到其最大值。
通过电感比 k、谐振电感 L r p和第一谐振频率点 f r 1,得到CLLLC变换器的全部硬件参数。由式(8)建立带有约束条件的效率曲面,如图6所示。将效率曲面简化为效率等高线,式(4)~式(5)中的6项设计条件受谐振电感值 L r p约束,即计算结果大于 L r p
在约束条件范围内,对转换效率进行寻优,得到满足约束且效率最高处的硬件参数 L r p k。在DBO寻优过程中,初始位置与全局最优位置,如图7所示。
为了验证DBO-FHA算法的寻优性能,分别采用量子粒子群(Quantum-behaved Particle Swarm Optimization,QPSO)算法[17]、灰狼优化(Grey Wolf Optimizer,GWO)算法[18]以及蜣螂算法进行CLLLC参数寻优,结果如图8所示。DBO算法的收敛速度与所求目标函数适应度值均优于QPSO与GWO。
为了验证上述分析的正确性和设计方法的有效性,本文设计搭建了一台CLLLC变换器样机,参数如表1所示。由于实物制作中电感、变压器等存在误差,因而计算参数与实际制作元件参数如表2所示,关键器件选型如表3所示,样机结构如图9所示。
测试中,以典型工作点、典型工作波形为研究对象,变换器正向工作时,输入为350~300 V,输出为250 V,以1 kW恒功率运行时,其桥臂中点电压波形与谐振腔电流波形分别如图10图11所示。
图10可知,变压器原边电流在变压器励磁电感钳位的过程,且原边MOSFET导通前,体二极管先行导通,变换器正向工作时实现ZVS。图11a中,负载侧电压为238.76 V,电流为4.296 A,功率为1 025.71 W,此时工作频率为170 kHz,变换器欠谐振。图11b中,负载侧电压为246.16 V,电流为4.106 A,功率为1 010.73 W,此时工作频率为199.14 kHz,应处在第一谐振点附近,变换器准谐振且变比为1.42,表明谐振腔增益为1.01,符合预期需求。因此,变换器正向工作时,频率范围为168~220 kHz,满足设计要求。
变换器反向工作输入为250 V,输出为350~300 V,变换器以1 kW恒功率运行时,其桥臂中点电压波形与谐振腔电流波形分别如图12图13所示。
图12中可知,在副边MOSFET导通前,体二极管先行导通,变换器反向工作时实现ZVS。图13a中,负载侧电压为318.37 V,电流为3.156 A,功率为1 025.71 W,此时工作频率为220.53 kHz,变换器工作在过谐振状态。图13b中,负载侧电压为348.97 V,电流为3.124 A,功率为1 090.2 W,此时工作频率为201.37 kHz,应处在第一谐振点附近,变换器准谐振且变比为1.39,表明谐振腔增益为0.99,符合设计参数,且满足应用需求。因此,变换器反向工作时,频率范围为200~230 kHz,同样满足设计参数。
为了验证本文方法的有效性,与FHA方法进行对比,结果如图14所示。样机正向工作时,变换器效率超过93%,输入为350 V,输出为250 V、工作在第一谐振点时,其峰值效率可达97%。本文设计方法所设计的CLLC变换器参数在实际运行中的效率曲线均优于FHA设计方法所设计的变换器参数。
当环境温度为21.1 ℃,变换器满载运行30 min后自然冷却,磁性元件和MOSFET均温度较低,没有明显温升,如图15所示,进一步证明了本文方案的合理性。
本文通过FHA推导CLLLC变换器设计约束,引入效率平面作为寻优算法的目标函数,得到最高效率点处变换器硬件参数。该方法能够满足设计增益需求的同时,使变换器具有全负载范围软开关的能力,效率最高可达97%。但因试验中整流管使用SiC-MOSFET器件,其二极管压降较大,造成功率损耗,后续将结合优化的同步整流控制方法进行相应调制。
  • *陕西省自然科学研究项目(2023-JC-YB-442)
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doi: 10.19620/j.cnki.1000-3703.20240648
  • 首发时间:2025-11-18
  • 出版时间:2025-02-24
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  • 修回日期:2024-09-10
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*陕西省自然科学研究项目(2023-JC-YB-442)
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    陕西理工大学电气工程学院,汉中 723000
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