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The three-phase inverter is an important part of the motor drive system in an electric vehicle (EV). When a fault occurs, the fault sample size will be limited due to the short occurrence time, resulting in sample imbalance. To solve this problem, an inverter fault diagnosis method combining conditional generative adversarial network (CGAN) and convolutional neural network (CNN) is proposed in this paper. First, the phase current is taken as a fault sensitive signal, its frequency-domain characteristics are obtained by fast Fourier transform, and normalized preprocessing is carried out. Then, each sample is labeled and input into the CGAN model for countermeasure training to generate new samples in each fault mode. Finally, the CNN model is used to distinguish various fault modes of inverter. Through experimental research, it is found that the fault diagnosis accuracy based on CGAN-CNN can reach more than 98%, indicating that the proposed sample generation method is better than the traditional Smote and GAN methods. The results in this paper provide theoretical support for the intelligent operation and maintenance of new energy EVs.
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三相逆变器是电动汽车电机驱动系统的重要部件,当出现故障时因发生时间较短导致故障样本规模受限,进而造成样本不均衡。为解决上述问题,提出1种融合条件生成对抗网络 CGAN(conditional generative adversarial network)与卷积神经网络 CNN(convolutional neural network)的逆变器故障诊断方法。首先将相电流作为故障敏感信号,经快速傅里叶变换 FFT(fast Fourier transform)得到其频域特征,并进行归一化预处理;然后将各样本添加标签后输入 CGAN 模型进行对抗训练,生成各故障模式下的新样本。最后,采用CNN 模型实现逆变器各类故障模式判别。实验结果表明,基于 CGAN-CNN 的故障诊断正确率可达98%以上,说明所提样本生成方法优于传统合成少数类过采样技术 SMOTE(synthetic minority over-sampling technique)方法和生成对抗网络 GAN(generative adversarial network)方法,可为新能源电动汽车智能运维提供理论支撑。
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孙权(1987-),男,通信作者,博士,讲师。研究方向:功率变换器故障检测与健康状态评估、机器学习与数据挖掘。E-mail: sequel2005@163.com。 |
彭飞(1997-),男,硕士。研究方向:故障诊断与深度学习。E-mail: 812887688@qq.com。
李宏胜(1966–), 男,博士,教授。研究方向:数控技术、高性能伺服驱动、机器人控制与智能控制。E-mail: zdhxlhs@njit.edu.cn。
于翔海(1996-),男,硕士。研究方向:故障诊断与深度学习。E-mail: njityxh1996@163.com。
孙国栋(1992-),男,博士研究生。研究方向:电力电子系统故障诊断技术。E-mail: 734305447@qq.com。
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Schematic of GAN, figureFileSmall=n05ffqEXkcoCwCerMq85Og==, figureFileBig=I7NkdbWVM2tG2HbsqrkcKg==, tableContent=null), ArticleFig(id=1154032487958303601, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=CN, label=图1, caption=
GAN 原理结构, figureFileSmall=n05ffqEXkcoCwCerMq85Og==, figureFileBig=I7NkdbWVM2tG2HbsqrkcKg==, tableContent=null), ArticleFig(id=1154032488021218165, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=EN, label=Fig. 2, caption=
Schematic of CGAN, figureFileSmall=35IbKedCZ3p6IvJ2A+IvBQ==, figureFileBig=8R2uj7vaBZeh6LlGVUBQMA==, tableContent=null), ArticleFig(id=1154032488117687159, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=CN, label=图2, caption=
CGAN 原理结构, figureFileSmall=35IbKedCZ3p6IvJ2A+IvBQ==, figureFileBig=8R2uj7vaBZeh6LlGVUBQMA==, tableContent=null), ArticleFig(id=1154032488188990331, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=EN, label=Fig. 3, caption=
Schematic of CNN, figureFileSmall=szvZFoLK0BENvWiMapBANQ==, figureFileBig=4cCCcrJMKmZhtS1fapJOhQ==, tableContent=null), ArticleFig(id=1154032488264487806, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=CN, label=图3, caption=
CNN 原理结构, figureFileSmall=szvZFoLK0BENvWiMapBANQ==, figureFileBig=4cCCcrJMKmZhtS1fapJOhQ==, tableContent=null), ArticleFig(id=1154032488331596673, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=EN, label=Fig. 4, caption=
Structure of CNN network model, figureFileSmall=vd7qm9XrPDLqo1lH5W63GQ==, figureFileBig=6Pf2/9qkiNn9ksx0Mpt7jw==, tableContent=null), ArticleFig(id=1154032488419677060, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=CN, label=图4, caption=
CNN 网络模型结构, figureFileSmall=vd7qm9XrPDLqo1lH5W63GQ==, figureFileBig=6Pf2/9qkiNn9ksx0Mpt7jw==, tableContent=null), ArticleFig(id=1154032488499368840, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=EN, label=Fig. 5, caption=
Flow chart of fault diagnosis based on CGAN-CNN, figureFileSmall=iJnE1+9bJqKfIfMH0GBYLQ==, figureFileBig=E/2t3YNZfKpQvJBPG8o7pQ==, tableContent=null), ArticleFig(id=1154032488587449226, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=CN, label=图5, caption=
CGAN-CNN 故障诊断流程, figureFileSmall=iJnE1+9bJqKfIfMH0GBYLQ==, figureFileBig=E/2t3YNZfKpQvJBPG8o7pQ==, tableContent=null), ArticleFig(id=1154032488667141003, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=EN, label=Fig. 6, caption=
Experimental platform of BLDCM drive system fault detection, figureFileSmall=6bcfJ26sdf6Y970Ff1KUDw==, figureFileBig=G8ucyxOmHyk8Nn9Nf15Eng==, tableContent=null), ArticleFig(id=1154032488780387213, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=CN, label=图6, caption=
BLDCM 驱动系统故障检测实验平台, figureFileSmall=6bcfJ26sdf6Y970Ff1KUDw==, figureFileBig=G8ucyxOmHyk8Nn9Nf15Eng==, tableContent=null), ArticleFig(id=1154032488948159376, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=EN, label=Fig. 7, caption=
Waveforms in ${\mathrm{{FC}}}_{0},{\mathrm{{FC}}}_{4},{\mathrm{{FC}}}_{5}$ and ${\mathrm{{FC}}}_{6}$ under load ${}_{1}$, figureFileSmall=EHPmMOKUIZB706f6bAWwOw==, figureFileBig=lgc3rZPzcafuztsJkoGuCg==, tableContent=null), ArticleFig(id=1154032489011073937, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=CN, label=图7, caption=
${\mathrm{{load}}}_{1}$ 情形下 ${\mathrm{{FC}}}_{0}$ 、 ${\mathrm{{FC}}}_{4}$ 、 ${\mathrm{{FC}}}_{5}$ 和 ${\mathrm{{FC}}}_{6}$ 状态下 ${i}_{\mathrm{a}}$ 的波形, figureFileSmall=EHPmMOKUIZB706f6bAWwOw==, figureFileBig=lgc3rZPzcafuztsJkoGuCg==, tableContent=null), ArticleFig(id=1154032489061405587, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=EN, label=Fig. 8, caption=
Visual clustering of generated samples using t-SNE under load2, figureFileSmall=cXLylnzriTGEtxFP9Wt6Gw==, figureFileBig=aZ0EsMIIftqmfDxe2uehvA==, tableContent=null), ArticleFig(id=1154032489132708757, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=CN, label=图8, caption=
${\mathrm{{load}}}_{2}$ 情形下生成样本 t-SNE 可视化聚类, figureFileSmall=cXLylnzriTGEtxFP9Wt6Gw==, figureFileBig=aZ0EsMIIftqmfDxe2uehvA==, tableContent=null), ArticleFig(id=1154032489216594838, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=EN, label=Fig. 9, caption=
CNN model fault diagnosis confusion matrix in input modes of sample sets ${A}_{1},{A}_{2}$ and ${A}_{3}$, figureFileSmall=lXQ9K9hW2GcAyWgzVK/Edg==, figureFileBig=ZL5aG6BH38BaZg2ckkpIoQ==, tableContent=null), ArticleFig(id=1154032489279509400, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=CN, label=图9, caption=
样本集 ${A}_{1}$ 、 ${A}_{2}$ 、 ${A}_{3}$ 输入方式下的 CNN 模型故障诊断混淆矩阵, figureFileSmall=lXQ9K9hW2GcAyWgzVK/Edg==, figureFileBig=ZL5aG6BH38BaZg2ckkpIoQ==, tableContent=null), ArticleFig(id=1154032489346618266, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=EN, label=Fig. 10, caption=
Comparison of classification accuracy of CNN model in input modes of sample sets ${A}_{1},{A}_{2}$ and ${A}_{3}$, figureFileSmall=+aWVW4gHtZIJGeQxTxu+7A==, figureFileBig=0uElJNo1T+uw4ccP8T+vCw==, tableContent=null), ArticleFig(id=1154032489405338524, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=CN, label=图10, caption=
3种样本集 ${A}_{1}$ 、 ${A}_{2}$ 和 ${A}_{3}$ 输入方式下的 CNN 模型分类准确率对比, figureFileSmall=+aWVW4gHtZIJGeQxTxu+7A==, figureFileBig=0uElJNo1T+uw4ccP8T+vCw==, tableContent=null), ArticleFig(id=1154032489459864478, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=EN, label=Fig. 11, caption=
SMOTE-CNN, GAN-CNN and CGAN-CNN fault diagnosis confusion matrixes in input mode of sample set${A}_{4}$, figureFileSmall=UVIs8D4WgSNvVf1VGOZUIw==, figureFileBig=tt6Pqsb3yZJve1wUqGxCSA==, tableContent=null), ArticleFig(id=1154032489535361951, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=CN, label=图11, caption=
样本集 ${A}_{4}$ 输入方式下的 SMOTE-CNN、GAN-CNN 和 CGAN-CNN 故障诊断混淆矩阵, figureFileSmall=UVIs8D4WgSNvVf1VGOZUIw==, figureFileBig=tt6Pqsb3yZJve1wUqGxCSA==, tableContent=null), ArticleFig(id=1154032489619248033, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=EN, label=Fig. 12, caption=
Comparison of classification accuracy among SMOTE-CNN, GAN-CNN and CGAN-CNN in input mode of sample set ${A}_{4}$, figureFileSmall=JQWeMBCTgJan72OEIneJ2Q==, figureFileBig=LgQClnTYTmvMKj7DRteIQw==, tableContent=null), ArticleFig(id=1154032489753465764, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=CN, label=图12, caption=
样本集 ${A}_{4}$ 输入方式下的 SMOTE-CNN、GAN-CNN 和 CGAN-CNN 分类准确率对比, figureFileSmall=JQWeMBCTgJan72OEIneJ2Q==, figureFileBig=LgQClnTYTmvMKj7DRteIQw==, tableContent=null), ArticleFig(id=1154032489824768932, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=EN, label=Tab. 1, caption=
Fault modes of three-phase full-bridge inverter, figureFileSmall=null, figureFileBig=null, tableContent=
| 故障编号 | 故障模式 | 故障编号 | 故障模式 |
| ${\mathrm{{FC}}}_{0}$ | 正常状态 | ${\mathrm{{FC}}}_{4}$ | ${\mathrm{T}}_{4}$ 管开路 |
| ${\mathrm{{FC}}}_{1}$ | ${\mathrm{T}}_{1}$ 管开路 | ${\mathrm{{FC}}}_{5}$ | ${\mathrm{T}}_{5}$ 管开路 |
| ${\mathrm{{FC}}}_{2}$ | ${\mathrm{T}}_{2}$ 管开路 | ${\mathrm{{FC}}}_{6}$ | ${\mathrm{T}}_{6}$ 管开路 |
| ${\mathrm{{FC}}}_{3}$ | ${\mathrm{T}}_{3}$ 管开路 | | |
), ArticleFig(id=1154032489904460710, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=CN, label=表1, caption=
三相全桥逆变器结构故障模式, figureFileSmall=null, figureFileBig=null, tableContent=
| 故障编号 | 故障模式 | 故障编号 | 故障模式 |
| ${\mathrm{{FC}}}_{0}$ | 正常状态 | ${\mathrm{{FC}}}_{4}$ | ${\mathrm{T}}_{4}$ 管开路 |
| ${\mathrm{{FC}}}_{1}$ | ${\mathrm{T}}_{1}$ 管开路 | ${\mathrm{{FC}}}_{5}$ | ${\mathrm{T}}_{5}$ 管开路 |
| ${\mathrm{{FC}}}_{2}$ | ${\mathrm{T}}_{2}$ 管开路 | ${\mathrm{{FC}}}_{6}$ | ${\mathrm{T}}_{6}$ 管开路 |
| ${\mathrm{{FC}}}_{3}$ | ${\mathrm{T}}_{3}$ 管开路 | | |
), ArticleFig(id=1154032489992541096, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=EN, label=Tab. 2, caption=
Structure of CGAN model, figureFileSmall=null, figureFileBig=null, tableContent=
| 组成部分 | 结构 | 激活函数 | 优化器 |
| 判别器 | 卷积层 1 | Relu | Adam |
| Maxpool 池化层 1 卷积层 2 Maxpool 池化层 2 | Relu |
| 全连接层 1 | Relu |
| 全连接层 2 | Sigmoid |
| 生成器 | 全连接层 1 | |
| 卷积层 1 | Relu |
| 卷积层 2 | Relu |
| 卷积层 3 | Tanh |
), ArticleFig(id=1154032490055455657, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=CN, label=表2, caption=
CGAN 模型结构, figureFileSmall=null, figureFileBig=null, tableContent=
| 组成部分 | 结构 | 激活函数 | 优化器 |
| 判别器 | 卷积层 1 | Relu | Adam |
| Maxpool 池化层 1 卷积层 2 Maxpool 池化层 2 | Relu |
| 全连接层 1 | Relu |
| 全连接层 2 | Sigmoid |
| 生成器 | 全连接层 1 | |
| 卷积层 1 | Relu |
| 卷积层 2 | Relu |
| 卷积层 3 | Tanh |
), ArticleFig(id=1154032490139341738, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=EN, label=Tab. 3, caption=
Parameters of CNN network model, figureFileSmall=null, figureFileBig=null, tableContent=
| 隐含层 | 卷积核 尺寸 | 卷积核 数量 | 卷积 步长 | 输出尺寸 |
| 输入层 | | | | ${1500}\times 1 \times 1$ |
| 卷积层 C1 | $3 \times 1$ | 8 | 1 | ${1500}\times 1 \times 8$ |
| 池化层 P1 | $2 \times 1$ | 8 | 2 | ${750}\times 1 \times 8$ |
| 卷积层 C2 | $3 \times 1$ | 16 | 1 | ${750}\times 1 \times {16}$ |
| 池化层 P2 | $2 \times 1$ | 16 | 2 | ${375}\times 1 \times {16}$ |
| 全连接层 | | | | ${6000}\times 1$ |
| Softmax | 7 | 1 | | 7 |
), ArticleFig(id=1154032490235810734, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=CN, label=表3, caption=
CNN 网络模型参数, figureFileSmall=null, figureFileBig=null, tableContent=
| 隐含层 | 卷积核 尺寸 | 卷积核 数量 | 卷积 步长 | 输出尺寸 |
| 输入层 | | | | ${1500}\times 1 \times 1$ |
| 卷积层 C1 | $3 \times 1$ | 8 | 1 | ${1500}\times 1 \times 8$ |
| 池化层 P1 | $2 \times 1$ | 8 | 2 | ${750}\times 1 \times 8$ |
| 卷积层 C2 | $3 \times 1$ | 16 | 1 | ${750}\times 1 \times {16}$ |
| 池化层 P2 | $2 \times 1$ | 16 | 2 | ${375}\times 1 \times {16}$ |
| 全连接层 | | | | ${6000}\times 1$ |
| Softmax | 7 | 1 | | 7 |
), ArticleFig(id=1154032490302919600, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=EN, label=Tab. 5, caption=
Unbalanced proportion of each sample set, figureFileSmall=null, figureFileBig=null, tableContent=
| 样本集 | 不平衡比例 |
| ${A}_{1}$ | $1 : 1 : 1 : 1 : 1 : 1$ |
| ${A}_{2}$ | 2:2:2:2:2:2:1 |
| ${A}_{3}$ | 10:10:10:10:10:10:3 |
| ${A}_{4}$ | $1 : 1 : 1 : 1 : 1 : 1$ |
), ArticleFig(id=1154032490474886068, tenantId=1146029695717560320, journalId=1146031654075715584, articleId=1153375933345026441, language=CN, label=表5, caption=
各样本集不平衡比例, figureFileSmall=null, figureFileBig=null, tableContent=
| 样本集 | 不平衡比例 |
| ${A}_{1}$ | $1 : 1 : 1 : 1 : 1 : 1$ |
| ${A}_{2}$ | 2:2:2:2:2:2:1 |
| ${A}_{3}$ | 10:10:10:10:10:10:3 |
| ${A}_{4}$ | $1 : 1 : 1 : 1 : 1 : 1$ |
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