Article(id=1149844396771901955, tenantId=1146029695717560320, journalId=1146031654075715584, issueId=1146828027490604008, articleNumber=null, orderNo=null, doi=10.13234/j.issn.2095-2805.2025.2.188, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1655222400000, receivedDateStr=2022-06-15, revisedDate=1662566400000, revisedDateStr=2022-09-08, acceptedDate=1663084800000, acceptedDateStr=2022-09-14, onlineDate=1752073867242, onlineDateStr=2025-07-09, pubDate=1743264000000, pubDateStr=2025-03-30, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1752075835033, onlineIssueDateStr=2025-07-09, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=1752073867242, onlineFirstDateStr=2025-07-09, sourceXml=null, magXml=null, createTime=1752073867242, creator=13701087609, updateTime=1752073867242, updator=13701087609, issue=Issue{id=1146828027490604008, tenantId=1146029695717560320, journalId=1146031654075715584, year='2025', volume='23', issue='2', pageStart='1', pageEnd='306', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=0, createTime=1751354708786, creator=13701087609, updateTime=1765499546380, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1206155776469561741, tenantId=1146029695717560320, journalId=1146031654075715584, issueId=1146828027490604008, language=EN, specialIssueTitle=, coverIllustrator=, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1206155776469561742, tenantId=1146029695717560320, journalId=1146031654075715584, issueId=1146828027490604008, language=CN, specialIssueTitle=, coverIllustrator=, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=188, endPage=195, ext={EN=ArticleExt(id=1149844397459767814, articleId=1149844396771901955, tenantId=1146029695717560320, journalId=1146031654075715584, language=EN, title=Design and Optimization Method for Parameters of Wireless Power Transfer System in Marine Environment, columnId=1152281494212408178, journalTitle=Journal of Power Supply, columnName=Wireless Power Transfer, runingTitle=null, highlight=null, articleAbstract=

Aimed at the problem of eddy current loss, a method for the parameter design and optimization of a wireless power transfer (WPT) system in seawater is proposed to optimize the power transmission efficiency of the system. First, based on the analysis of the electromagnetic field of coils under operation in seawater, the equivalent mutual inductance model of the WPT system in a marine environment is obtained by using the equivalent impedance of eddy current loss. Second, when the positions of the primary- and secondary-side coils are fixed, the corresponding relationship between the equivalent impedance of eddy current loss and the operating frequency of the system and the number of coil turns is established, and the feasibility of the calculation method for the equivalent impedance of eddy current loss is verified by using the coils on both sides of the WPT system. Finally, based on the energy model of an LCC/S-type WPT system in seawater, the particle swarm optimization algorithm is used to optimize the transmission efficiency. A test system was built with the optimized parameters, and results show that when it transmitted 1 kW of power in a simulated marine environment, its overall efficiency can reach 84%.

, correspAuthors=Kehan ZHANG, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, authorCompany=null, fund=null, authors=null, authorsList=Kehan ZHANG, Xinyang LI, Fan DAI, Jiaming FENG, Zhengchao YAN, Zhaoyong MAO), CN=ArticleExt(id=1149844467286540323, articleId=1149844396771901955, tenantId=1146029695717560320, journalId=1146031654075715584, language=CN, title=海洋环境无线电能系统的参数设计及优化方法, columnId=1149830138994647045, journalTitle=电源学报, columnName=无线电能传输, runingTitle=null, highlight=null, articleAbstract=

针对涡流损耗问题,提出海水中无线电能传输系统参数的设计优化方法,能使系统电能传输效率最优。首先,在海水中通电线圈电磁场分析的基础上,利用涡流损耗等效阻抗,得到海洋环境无线电能传输系统的等效互感模型。其次,在初、次级侧线圈位置固定时,建立涡流损耗等效阻抗与系统工作频率及线圈匝数的关系表达式,并利用传输系统两侧线圈验证了涡流损耗等效阻抗计算方法的可行性。最后,以海水中LCC/S型无线电能传输系统的能量模型为基础,采用粒子群优化算法进行最大传输效率寻优。利用优化参数,搭建实验测试系统,结果显示,在模拟海洋环境中,当传输功率为1 kW时实验系统整体效率可达84%。

, correspAuthors=张克涵, authorNote=null, correspAuthorsNote=
张克涵(1971— ),男,博士,副教授。研究方向:无线电能传输技术,电机控制系统。E-mail:
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李鑫阳(1997— ),男,硕士研究生。研究方向:无线电能传输技术。E-mail:

代凡(1998— ),男,硕士研究生。研究方向:电力电子技术,无线电能传输。E-mail:

冯佳明(1996— ),男,硕士研究生。研究方向:电力电子技术,无线电能传输。E-mail:

闫争超(1991— ),男,博士,助理教授。研究方向:电力电子、无线电能传输。E-mail:

毛昭勇(1980— ),男,博士,教授。研究方向:水下航行器总体优化与能源动力推进技术。E-mail:

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李鑫阳(1997— ),男,硕士研究生。研究方向:无线电能传输技术。E-mail:

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李鑫阳(1997— ),男,硕士研究生。研究方向:无线电能传输技术。E-mail:

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代凡(1998— ),男,硕士研究生。研究方向:电力电子技术,无线电能传输。E-mail:

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代凡(1998— ),男,硕士研究生。研究方向:电力电子技术,无线电能传输。E-mail:

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冯佳明(1996— ),男,硕士研究生。研究方向:电力电子技术,无线电能传输。E-mail:

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冯佳明(1996— ),男,硕士研究生。研究方向:电力电子技术,无线电能传输。E-mail:

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闫争超(1991— ),男,博士,助理教授。研究方向:电力电子、无线电能传输。E-mail:

"}, bioImg=null, bioContent=

闫争超(1991— ),男,博士,助理教授。研究方向:电力电子、无线电能传输。E-mail:

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毛昭勇(1980— ),男,博士,教授。研究方向:水下航行器总体优化与能源动力推进技术。E-mail:

"}, bioImg=null, bioContent=

毛昭勇(1980— ),男,博士,教授。研究方向:水下航行器总体优化与能源动力推进技术。E-mail:

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figureFileBig=43ibiIlidwqa/G3HaVx0ew==, tableContent=null), ArticleFig(id=1205945154586865719, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1149844396771901955, language=CN, label=图10, caption=系统传输性能, figureFileSmall=tGsozPkeClKwWGWNPRUuNQ==, figureFileBig=43ibiIlidwqa/G3HaVx0ew==, tableContent=null), ArticleFig(id=1205945154695917630, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1149844396771901955, language=EN, label=Tab. 1, caption=

Actual parameters of magnetically coupled resonance system

, figureFileSmall=null, figureFileBig=null, tableContent=
参数 数值 参数 数值
$f\text{ / kHz}$ 150.60 ${C}_{\text{S}}\text{/nF}$ 11.73
${L}_{\text{f}}\text{ /μH}$ 18.29 ${L}_{\text{P}}\text{/μH}$ 119.90
${C}_{\text{f}}\text{/nF}$ 61.06 ${L}_{\text{S}}\text{/μH}$ 95.20
${C}_{\text{P}}\text{/nF}$ 10.91 $M\text{/μH}$ 24.72
), ArticleFig(id=1205945154825941059, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1149844396771901955, language=CN, label=表1, caption=

磁耦合谐振系统的实际参数

, figureFileSmall=null, figureFileBig=null, tableContent=
参数 数值 参数 数值
$f\text{ / kHz}$ 150.60 ${C}_{\text{S}}\text{/nF}$ 11.73
${L}_{\text{f}}\text{ /μH}$ 18.29 ${L}_{\text{P}}\text{/μH}$ 119.90
${C}_{\text{f}}\text{/nF}$ 61.06 ${L}_{\text{S}}\text{/μH}$ 95.20
${C}_{\text{P}}\text{/nF}$ 10.91 $M\text{/μH}$ 24.72
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海洋环境无线电能系统的参数设计及优化方法
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张克涵 1 , 李鑫阳 1 , 代凡 1 , 冯佳明 1 , 闫争超 2 , 毛昭勇 1
电源学报 | 无线电能传输 2025,23(2): 188-195
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电源学报 | 无线电能传输 2025, 23(2): 188-195
海洋环境无线电能系统的参数设计及优化方法
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张克涵1 , 李鑫阳1 , 代凡1 , 冯佳明1 , 闫争超2 , 毛昭勇1
作者信息
  • 1 西北工业大学航海学院,西安 710072
  • 2 西安交通大学电气工程学院,西安 710049
  • 李鑫阳(1997— ),男,硕士研究生。研究方向:无线电能传输技术。E-mail:

    代凡(1998— ),男,硕士研究生。研究方向:电力电子技术,无线电能传输。E-mail:

    冯佳明(1996— ),男,硕士研究生。研究方向:电力电子技术,无线电能传输。E-mail:

    闫争超(1991— ),男,博士,助理教授。研究方向:电力电子、无线电能传输。E-mail:

    毛昭勇(1980— ),男,博士,教授。研究方向:水下航行器总体优化与能源动力推进技术。E-mail:

通讯作者:

张克涵(1971— ),男,博士,副教授。研究方向:无线电能传输技术,电机控制系统。E-mail:
Design and Optimization Method for Parameters of Wireless Power Transfer System in Marine Environment
Kehan ZHANG1 , Xinyang LI1 , Fan DAI1 , Jiaming FENG1 , Zhengchao YAN2 , Zhaoyong MAO1
Affiliations
  • 1 School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
  • 2 School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
出版时间: 2025-03-30 doi: 10.13234/j.issn.2095-2805.2025.2.188
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针对涡流损耗问题,提出海水中无线电能传输系统参数的设计优化方法,能使系统电能传输效率最优。首先,在海水中通电线圈电磁场分析的基础上,利用涡流损耗等效阻抗,得到海洋环境无线电能传输系统的等效互感模型。其次,在初、次级侧线圈位置固定时,建立涡流损耗等效阻抗与系统工作频率及线圈匝数的关系表达式,并利用传输系统两侧线圈验证了涡流损耗等效阻抗计算方法的可行性。最后,以海水中LCC/S型无线电能传输系统的能量模型为基础,采用粒子群优化算法进行最大传输效率寻优。利用优化参数,搭建实验测试系统,结果显示,在模拟海洋环境中,当传输功率为1 kW时实验系统整体效率可达84%。

海洋环境  /  磁耦合谐振  /  涡流损耗  /  涡流损耗等效阻抗  /  粒子群优化算法

Aimed at the problem of eddy current loss, a method for the parameter design and optimization of a wireless power transfer (WPT) system in seawater is proposed to optimize the power transmission efficiency of the system. First, based on the analysis of the electromagnetic field of coils under operation in seawater, the equivalent mutual inductance model of the WPT system in a marine environment is obtained by using the equivalent impedance of eddy current loss. Second, when the positions of the primary- and secondary-side coils are fixed, the corresponding relationship between the equivalent impedance of eddy current loss and the operating frequency of the system and the number of coil turns is established, and the feasibility of the calculation method for the equivalent impedance of eddy current loss is verified by using the coils on both sides of the WPT system. Finally, based on the energy model of an LCC/S-type WPT system in seawater, the particle swarm optimization algorithm is used to optimize the transmission efficiency. A test system was built with the optimized parameters, and results show that when it transmitted 1 kW of power in a simulated marine environment, its overall efficiency can reach 84%.

Marine environment  /  magnetically coupled resonance  /  eddy current loss  /  equivalent impedance of eddy current loss  /  particle swarm optimization algorithm
张克涵, 李鑫阳, 代凡, 冯佳明, 闫争超, 毛昭勇. 海洋环境无线电能系统的参数设计及优化方法. 电源学报, 2025 , 23 (2) : 188 -195 . DOI: 10.13234/j.issn.2095-2805.2025.2.188
Kehan ZHANG, Xinyang LI, Fan DAI, Jiaming FENG, Zhengchao YAN, Zhaoyong MAO. Design and Optimization Method for Parameters of Wireless Power Transfer System in Marine Environment[J]. Journal of Power Supply, 2025 , 23 (2) : 188 -195 . DOI: 10.13234/j.issn.2095-2805.2025.2.188
无人自主水下航行器AUV(autonomous under- water vehicle)能够完成监测、预警和采样等任务,在军事领域中应用广泛,但AUV本身带电量有限,需通过水下基站进行电能补给,增加续航时间及作业范围[1]。磁耦合谐振无线电能传输技术可将用电设备与电源隔离[2],成为了AUV与基站主要的电能交换方式。国内[3-5]和国外[6-8]对水下磁耦合谐振无线电能传输技术的研究几乎同时展开,发展到现在都具备了AUV水下大功率、高效率无线电能供给的能力。
磁耦合谐振无线电能传输技术应用于海洋环境时,涡流损耗是导致传输功率和效率下降的主要原因。文献[9]分析了圆形线圈在不同导电介质中的涡流损耗,并通过实验证明了介质电导率越高,涡流损耗越大,传输系统能量损失就越严重;文献[10]设计了1种喇叭形的线圈,能够有效降低涡流损耗对传输系统效率的影响,与传统的平面线圈相比,其在海水中的传输功率提高了10%;文献[11]利用解析法对海洋环境中方形线圈的涡流损耗进行了分析,证明了涡流损耗与电流平方之比的固定关系;文献[12]分析了不同间隙时电流频率与无线电能传输系统中涡流损耗的关系,证明了海水中的涡流损耗随谐振频率的增加而急剧增大;文献[13]对无铁芯的磁耦合谐振系统进行了海水中的建模分析,证明了系统的最佳工作频率应大于传输系统的谐振频率,并给出了海水中磁耦合谐振系统最佳工作频率的选择方法。涡流损耗问题是解决海水中无线电能系统传输效率、功率偏低的关键,但目前国内外对此研究得较少。
针对上述涡流损耗问题,本文以电能传输效率最优为目标,对海水中磁耦合谐振无线电能传输系统进行了参数优化。首先,分析了海水中通电线圈的涡流损耗,利用涡流损耗等效阻抗建立了海洋环境无线电能传输系统的等效互感模型。其次,在初、次级侧相对位置不变时,分析涡流损耗等效阻抗与系统工作频率及线圈匝数的关系,并利用粒子群算法对海水中无线电能传输系统的参数进行优化设计。最后,搭建了磁耦合谐振无线电能传输系统进行验证。
交变电流在海水中传播时,需对空间中任一点的电场强度进行计算。为方便叙述,将能量发射端称为初级侧,能量接收端称为次级侧。在无线电能传输系统中,某点的总电场强度是系统中所有单匝线圈共同作用的结果,为区分电场强度的来源,将空间中某点Q的总电场强度分为初级侧线圈在该点产生的电场强度${E}_{\text{P}}$和次级侧线圈在该点产生的电场强度${E}_{\text{S}}$,如图1所示。图中:${I}_{\text{P}}、{I}_{\text{S}}$分别为初、次级侧线圈的电流;${r}_{\text{P1}}、{r}_{\text{S1}}$分别为初、次级侧线圈的内径;${r}_{\text{P2}}、{r}_{\text{S2}}$分别为初、次级侧线圈外径;h为两线圈的中心距离。
为计算Q点的电场强度,建立海水中单匝线圈柱面坐标系的计算模型,如图2所示。
假定线圈在xoy平面,Q(ρ, φ, z)是空间任意一点,当线圈通过电流i(t)时,利用麦克斯韦方程,单匝线圈在空间Q点产生电场强度的表达式[14]
$\left\{\begin{array}{l}E(\rho,\phi,z)=-\frac{\text{j}\omega \mu rI}{2}\cdot \\ \text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }{\displaystyle {\int }_{0}^{\infty }\frac{\lambda }{\mu }}{J}_{1}(\lambda r){J}_{1}(\lambda \rho ){\text{e}}^{-\mu \left|z\right|}\text{d}\lambda {e}_{\phi }\\ \mu =\sqrt{{\lambda }^{2}-{k}^{2}}\\ {k}^{2}=\text{j}\omega \mu (\sigma +\text{j}\omega \epsilon )\end{array}\right.$
式中:ω为系统的角频率;μ为海水的磁导率;r为线圈半径;I为通入线圈的矢量电流;λ为波长;${J}_{1}$为一阶贝塞尔函数;σ 为海水的电导率;ε 为海水的介电常数。
根据式(1),可得到初、次级侧多匝线圈在空间中某点的电场强度${E}_{\text{P}}$${E}_{\text{S}}$分别为
$\left\{\begin{array}{l}{E}_{\text{P}}(\rho,\phi,z)=-\frac{\text{j}\omega \mu {I}_{\text{P}}}{2}\left[{N}_{\text{P}}{r}_{\text{P}}+\frac{d{N}_{\text{P}}({N}_{\text{P}}-1)}{2}\right]\cdot \\ \text{ }\text{ }\text{ }\text{ }{\displaystyle {\int }_{0}^{\infty }\frac{\lambda }{\mu }}{J}_{1}\left\{\lambda \left[{r}_{\text{P}}+\frac{d({N}_{\text{P}}-1)}{2}\right]\right\}{J}_{1}(\lambda \rho ){\text{e}}^{-\mu \left|z\right|}\text{d}\lambda {e}_{\phi }\\ {E}_{\text{S}}\text{(}\rho,\phi,z\text{)}=-\frac{\text{j}\omega \mu {I}_{\text{S}}}{2}\left[{N}_{\text{S}}{r}_{\text{S}}+\frac{d{N}_{\text{S}}\text{(}{N}_{\text{S}}-1\text{)}}{2}\right]\cdot \\ \text{ }\text{ }\text{ }\text{ }{\displaystyle {\int }_{0}^{\infty }\frac{\lambda }{\mu }}{J}_{1}\left\{\lambda \left[{r}_{\text{S}}+\frac{d({N}_{\text{S}}-1)}{2}\right]\right\}{J}_{1}\text{(}\lambda \rho {\text{)e}}^{-\mu \left|h-z\right|}\text{d}\lambda {e}_{\phi }\end{array}\right.$
式中:${N}_{\text{P}}、{N}_{\text{S}}$分别为初、次级侧线圈的匝数;d为线圈每增加或减少1匝时半径的变化量,取值应考虑线圈散热及实际线缆的弯曲性能;${r}_{\text{P}}、{r}_{\text{S}}$分别为初、次级侧线圈的最内侧半径。
无线电能传输系统在海水中任一点的总电场强度可由式(2)中初、次级两侧电场强度合成,当${\text{E}}_{\text{P}}、{\text{E}}_{\text{S}}$二者的相位差接近90°时,两线圈在海水中的涡流损耗${P}_{\text{eddy}}$可计算[15]
${P}_{\text{eddy}}={\displaystyle \underset{V}{\iiint }\sigma ({E}_{\text{P}}^{2}+{E}_{\text{S}}^{2})}\text{d}V$
式中,积分区域V表示涡流损耗区,主要是两线圈周围的海水空间。
在进行系统参数优化时,可以通过式(1)~式(3)计算出电场强度E和涡流损耗,二者都包含积分项,每次迭代都需要重新计算,过程复杂,需耗费大量时间。
从式(1)和式(2)可以看出,E的计算式中存在2类参数:第1类是与传输系统线圈结构及工作状态相关的参数,即线圈匝数N、工作频率f和通过线圈的电流I等,由文献[16]可知,NfI与电场强度大小均成正比;第2类是与Q点的空间位置相关的参数,即Q点的柱坐标(ρ,φ,z)和两线圈中心距离h。在式(2)中,只要Q点和两线圈的相对位置不变,与第2类参数相关的计算结果就不会改变,将该部分计算结果记为变量${k}_{\text{EP}}、{k}_{\text{ES}}$,再利用第1类参数与E的正比关系,可实现对式(2)的近似估算,减少计算复杂度。估算关系表示为
$\left\{\begin{array}{l}\left|{E}_{\text{P}}(\rho,\phi,z)\right|\approx {k}_{\text{EP}}(\rho,\phi,z){I}_{\text{P}}{N}_{\text{P}}f\\ \left|{E}_{\text{S}}(\rho,\phi,z)\right|\approx {k}_{\text{ES}}(\rho,\phi,z){I}_{\text{S}}{N}_{\text{S}}f\end{array}\right.$
将式(4)代入式(3),初级侧和次级侧线圈的涡流损耗${P}_{\text{eddy,P}}$${P}_{\text{eddy,S}}$可表示为
$\left\{\begin{array}{l}{P}_{\text{eddy,P}}={\displaystyle \underset{V}{\iiint }\sigma {[{k}_{\text{EP}}(\rho,\phi,z){N}_{\text{P}}f{I}_{\text{P}}]}^{2}}\text{d}V=\\ \text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }{I}_{\text{P}}^{\text{2}}{N}_{\text{P}}^{\text{2}}{f}^{2}{\displaystyle \underset{V}{\iiint }\sigma {k}_{\text{EP}}^{\text{2}}(\rho,\phi,z)}\text{ }\text{d}V\\ {P}_{\text{eddy,S}}={\displaystyle \underset{V}{\iiint }\sigma {[{k}_{\text{ES}}(\rho,\phi,z){N}_{\text{S}}f{I}_{\text{S}}]}^{2}}\text{d}V=\\ \text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }{I}_{\text{S}}^{2}{N}_{\text{S}}^{2}{f}^{2}{\displaystyle \underset{V}{\iiint }\sigma {k}_{\text{ES}}^{\text{2}}(\rho,\phi,z)}\text{ }\text{d}V\end{array}\right.$
根据式(5),类比电阻功率计算方法,引入等效涡流阻抗${R}_{\text{eddy,P}}$${R}_{\text{eddy,S}}$的概念,其表达式为
$\left\{\begin{array}{l}{R}_{\text{eddy,P}}={N}_{\text{P}}^{\text{2}}{f}^{2}{\displaystyle \underset{V}{\iiint }\sigma {k}_{\text{EP}}^{\text{2}}(\rho,\phi,z)\text{ }}\text{d}V=\\ \text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }{k}_{\text{eddy,P}}{N}_{\text{P}}^{2}{f}^{2}\\ {R}_{\text{eddy,S}}={N}_{\text{S}}^{2}{f}^{2}{\displaystyle \underset{V}{\iiint }\sigma {k}_{\text{ES}}^{\text{2}}(\rho,\phi,z)\text{ }}\text{d}V=\\ \text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }{k}_{\text{eddy,S}}{N}_{\text{S}}^{2}{f}^{2}\\ {k}_{\text{eddy,P}}={\displaystyle \underset{V}{\iiint }\sigma {k}_{\text{EP}}^{\text{2}}(\rho,\phi,z)\text{ }}\text{d}V\\ {k}_{\text{eddy,S}}={\displaystyle \underset{V}{\iiint }\sigma {k}_{\text{ES}}^{\text{2}}(\rho,\phi,z)\text{ }}\text{d}V\end{array}\right.$
只要传输线圈相对位置不变,线圈半径增量不变,${k}_{\text{eddy,P}}$${k}_{\text{eddy,S}}$可近似为常数,只需进行一次涡流损耗等效阻抗的计算或测量,就能通过式(5)和式(6)得到${k}_{\text{eddy,P}}$${k}_{\text{eddy,S}}$,并根据式(6)求出该种空间状态下不同匝数和工作频率的涡流损耗等效阻抗,继而根据电流估算出涡流损耗。
当线圈中通入一定频率的交流电,周围环境由空气变为海水时,线圈电阻的增量即为该种频率下线圈的涡流损耗等效阻抗。本文所涉及的AUV外壳为圆柱体,选用方弧形线圈,与圆形线圈类似,其尺寸可用匝间距和圆弧段半径表示。2种线圈涡流损耗推导过程一致,故方弧形线圈相对位置不变时,其涡流损耗等效阻抗的估算公式应与式(6)形式类似,再通过实验验证了二次方的关系适用于方弧形线圈。式(6)中,在初级侧线圈匝数15、频率200 kHz时测量得到${k}_{\text{eddy,P}}$,在次级侧线圈匝数18、频率200 kHz时测得${k}_{\text{eddy,S}}$,以这2个值为基础,通过式(6)来估算各种频率及匝数下的涡流损耗等效阻抗,并与实际测量值相比较,结果如图3所示。
图3可见,初、次级侧线圈涡流损耗等效阻抗的计算值与测量值接近,误差在可接受范围内,并且变化趋势一致,满足二次方关系,证明了式(6)适用于本文线圈涡流损耗的估算。
无线电能系统传输环境由空气转换至海水时,可将涡流损耗等效阻抗视为传输线圈阻抗的增量,则无线电能系统两侧线圈在海水中的等效阻抗可表示为
$\left\{\begin{array}{l}{R}_{\text{P,sea}}={R}_{\text{P}}+{R}_{\text{eddy,P}}\\ {R}_{\text{S,sea}}={R}_{\text{S}}+{R}_{\text{eddy,S}}\end{array}\right.$
式中:${R}_{\text{P,sea}}、{R}_{\text{S,sea}}$分别为初、次级侧线圈等效阻抗;${R}_{\text{P}}、{R}_{\text{S}}$分别为初、次级侧线圈阻抗。
本文采用LCC-S型谐振补偿结构,可视其为恒压源,为用电设备提供稳定的电压[17],其在海水中的等效模型如图4所示。其中初级侧的补偿结构由补偿电感${L}_{\text{f}}$、补偿电容${C}_{\text{P}}、{C}_{\text{f}}$和初级侧耦合线圈${L}_{\text{P}}$构成;次级侧的补偿结构采用常见的串联式补偿结构,仅用1个补偿电容${C}_{\text{S}}$对次级侧耦合线圈${L}_{\text{S}}$的电感进行补偿。图中:${R}_{\text{L}}$为等效负载电阻;${V}_{\text{P}}$为交流供电电压。
根据图4可得,系统处于谐振状态时次级侧输出功率Pout及系统整体传输效率η分别为
${P}_{\text{out}}={I}_{\text{S}}^{2}{R}_{\text{L}}=\frac{{M}^{2}{V}_{\text{P}}^{2}\text{/}{L}_{\text{f}}}{{Z}_{2}^{2}\text{/}{R}_{\text{L}}}$
$\eta =\frac{{\text{Z}}_{{C}_{\text{f}}}^{2}{\omega }^{2}{M}^{2}{R}_{L}}{{Z}_{\text{in}}{Z}_{\text{S}}{}^{2}{({R}_{\text{P,sea}}+{R}_{\text{ref}})}^{2}}\times 100\%$
式中:M为初、次级侧线圈互感;${V}_{\text{P}}$为级侧电压;${Z}_{\text{in}}$${Z}_{2}$分别为输入和输出等效阻抗;${Z}_{\text{S}}$为次级侧阻抗;${R}_{\text{ref}}$为次级侧折算到初级侧的反射阻抗。
在海水环境中,初、次级侧线圈匝数不变时,不同等效负载下工作频率与传输效率的关系如图5所示。由图5可见,当等效负载不变时,传输效率会随着工作频率的增加呈现先增加后下降的趋势,且整个系统存在使得传输效率最大的工作频率。
工作频率不变时,线圈匝数和涡流损耗等效阻抗与传输效率的关系如图6所示。由图6(a)可见,当工作频率固定时,系统传输效率最高点并不是出现在线圈匝数最大处,这是因为初、次级两侧的线圈匝数会同时影响互感大小和涡流损耗等效阻抗,互感的增加会提高无线电能传输性能,但是线圈匝数越多,涡流损耗等效阻抗越大,整个系统的能量损耗就越多。由图6(b)可见,如果两侧线圈涡流损耗等效阻抗为0,那么系统传输性能接近于空气中的状况,所以系统存在1组线圈匝数可以使传输效率最高。
优化设计目标表示为
$\begin{array}{l}\mathrm{max}\text{ }\text{ }\eta (f,{N}_{\text{P}},{N}_{\text{S}},d)\\ \text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }f\in [{f}_{\mathrm{min}},{f}_{\mathrm{max}}];\text{ }d{N}_{\text{P}}<{r}_{\text{P,max}};\text{ }d{N}_{\text{S}}<{r}_{\text{S},\mathrm{max}};\\ \text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }{P}_{out}>1\text{ }\text{ }kW\text{;}\text{ }f,d\in \text{R};\text{ }{N}_{\text{P}},{N}_{\text{S}}\in \text{Z}\end{array}$
式中:${f}_{\text{max}}、{f}_{\text{min}}$分别为系统工作频率f的上、下限,取${f}_{\text{max}}$=300 kHz、${f}_{\text{min}}$=100 kHz;${r}_{\text{P},\mathrm{max}}$${r}_{\text{S},\mathrm{max}}$分别为初、次级侧最外层线圈圆弧段半径的最大值,由供电基站及AUV形状尺寸决定,取${r}_{\text{P},\mathrm{max}}$= 440 mm、${r}_{\text{S},\mathrm{max}}$= 230 mm,线圈由最大尺寸往内铺设,即可遍历所有线圈匝数组合;${P}_{\text{out}}$为输出功率。
海水中的无线电能传输系统参数设计优化,其实是对初级侧线圈匝数${N}_{\text{P}}$、次级侧线圈匝数${N}_{\text{S}}$、工作频率f进行组合,找到使得系统传输效率最优的1组值(${N}_{\text{Popt}},{N}_{\text{Sopt}},{f}_{\text{opt}}$)。一般方法是以一定步长搜索所有可能的组合,比较后找到效率最优的组合,这种方法需要计算解空间中的几乎所有组合,计算量巨大。
粒子群算法能够对多变量问题进行快速求解,整个搜索过程通过跟踪2个极值实现,其中:一个极值为迭代过程中粒子自身在解空间中搜索到的最优解,称为个体极值${p}_{\text{best}}$;另一极值为该种群整体搜索到的当前全局最优解,称为全局极值${g}_{\text{best}}$。则粒子速度及位置更新方程表示为
$\begin{array}{c}{V}_{k+1}={\omega }_{1}{V}_{k}+\alpha [{c}_{1}{r}_{1}({p}_{best}{}_{k}-{X}_{k})+\\ {c}_{2}{r}_{2}({g}_{bestk}-{X}_{k})]\end{array}$
$\text{ }{X}_{k+1}={X}_{k}+{V}_{k+1}$
式中:${V}_{k}{}_{+1}$为第k+1代的迭代速度;${\omega }_{1}$为惯性因子;${V}_{k}$为第k代的迭代速度;$\alpha $为约束因子;${c}_{1}$${c}_{2}$为学习因子;${r}_{1}$${r}_{2}$为0~1之间随机数;${p}_{best}{}_{k}$为第k代个体的最佳方案;${g}_{bestk}$为第k次迭代后种群的全局最优方案;${X}_{k}$为第k代种群的位置;${X}_{k}{}_{+1}$为第k+1代种群的位置。
优越的约束因子能够引导粒子在最优解粒子周围来回振荡,使算法更快速地收敛,则有
$\left\{\begin{array}{l}\alpha =2/\left|2-\phi -{({\phi }^{2}-4\phi )}^{1/2}\right|\\ \phi ={c}_{1}+{c}_{2}\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\text{ }\phi >4\end{array}\right.$
本文以$(f,\text{ }{N}_{\text{P}},\text{ }{N}_{\text{S}})$为个体位置,在解空间内对系统海水中的效率进行最大寻优,当迭代次数${G}_{\text{en}}$达到最大迭代次数${G}_{\text{enmax}}$,且相邻数次优化结果的差距小于1%时,输出全局最优解,寻优过程如图7所示。负载电阻根据设计要求选择为50 Ω,线圈半径变化量d=4.5 mm,初级侧线径4.0 mm,次级侧线径2.5 mm,若要对初级侧线径和次级侧线径也进行寻优,根据实际需要增加算法中适应度和速度的维数即可。
通过仿真软件,以海水中最高传输效率为目标对系统进行参数优化,最大迭代次数为100,每代100组数据,优化结果如图8所示。
图8(a)可见,全局最佳适应度能在25代以内趋于稳定,找到真正的全局极值${g}_{\text{best}}$,大大减小了优化难度,缩短了优化时间。由图8(b)可见,在迭代至40代时就可以做到所有种群个体的${P}_{\text{best}}$均达到最优位置,整个优化算法的收敛速度很快。
经过100次迭代后,系统全局极值${g}_{\text{best}}$的位置即为最终优化参数,初级侧线圈匝数${N}_{\text{P}}$=13,次级侧线圈匝数${N}_{\text{S}}$=17,工作频率f =150 kHz。考虑实际应用的电容型号、耐压等问题,对频率进行微调,最终得到传输系统的参数,见表1
本文搭建了LCC-S型无线电能传输系统,如图9所示,进行功率电路部分及海水环境中的实验,此实验中两线圈距离为120 mm。图9中,实验系统的初级侧补偿电路及其他电子器件固定在防水外壳内部,初级侧线圈被非金属壳体包裹,底座为金属壳体,兼具支撑固定、耐压与散热的作用,供电线路通过防水接口与电源相连;次级侧的结构与初级侧类似,非金属壳体包裹次级侧线圈,金属外壳能够与AUV拼接,实验时次级侧输出通过防水线缆与外部负载相连。
系统的工作状态波形及在空气和海水中的实验效率变化情况如图10所示。图10中:${V}_{\text{P}}$为初级侧补偿电路的输入电压;${I}_{{L}_{\text{f}}}$为初级侧电感${L}_{\text{f}}$上流过的电流;${V}_{\text{S}}$为整流器的输入电压;${I}_{\text{S}}$为整流器的输入电流。实验时,系统在空气中与海水中的输入电压保持一致,逐步升高输入电压直到输出功率高于1 kW,记录实验数据。
图10可见,实验中工作频率为150.6 kHz时,系统处于谐振状态,达到理论上的最优输出;随着系统输出功率的不断升高,在海水中的效率维持在82%~84%,与图8的结果接近,达到海水中无线电能传输系统的最大效率。
对比空气和海水这2种环境,涡流损耗导致系统在海水中的传输效率下降8.9%左右,并且随着输入电压的上升,系统的电能传输效率基本不变,证明了耦合线圈位置、工作频率和线圈参数不变时,涡流损耗等效阻抗基本不变,符合前文分析结果。故无线电能传输系统向海水环境扩展时,可利用等效涡流阻抗的方法建立海洋环境模型,并利用优化粒子群算法快速设计出系统最优参数。
针对磁耦合谐振无线电能传输系统应用于海洋环境时的涡流损耗问题,本文对磁耦合谐振系统的工作频率及线圈匝数进行了优化设计,使系统的电能传输效率达到最优。首先,对海水中通电线圈的涡流损耗进行了分析,搭建了海洋环境无线电能传输系统的等效互感模型。其次,利用系统工作频率及线圈匝数估算线圈相对位置不变时的涡流损耗等效阻抗,并实验验证了估算方法的可行性。最后,在磁耦合谐振系统海水中能量模型的基础上,采用粒子群算法对系统参数进行优化。实验结果显示,优化后的系统在海水中传输功率为1 kW时,整体效率可达84%。
  • 国家自然科学基金资助面上项目(52171338)
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2025年第23卷第2期
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doi: 10.13234/j.issn.2095-2805.2025.2.188
  • 接收时间:2022-06-15
  • 首发时间:2025-07-09
  • 出版时间:2025-03-30
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  • 收稿日期:2022-06-15
  • 修回日期:2022-09-08
  • 录用日期:2022-09-14
基金
National Natural Science Foundation of China(52171338)
国家自然科学基金资助面上项目(52171338)
作者信息
    1 西北工业大学航海学院,西安 710072
    2 西安交通大学电气工程学院,西安 710049

通讯作者:

张克涵(1971— ),男,博士,副教授。研究方向:无线电能传输技术,电机控制系统。E-mail:
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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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