CPSS Transactions on Power Electronics and Applications最新文献

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A Step-Up Multilevel Inverter Based on Switched Capacitor Technique With Reduced Components 一种基于开关电容器技术的升压型多电平逆变器,具有更少的元件
CPSS Transactions on Power Electronics and Applications Pub Date : 2024-01-02 DOI: 10.24295/CPSSTPEA.2023.00053
Tapas Roy
{"title":"A Step-Up Multilevel Inverter Based on Switched Capacitor Technique With Reduced Components","authors":"Tapas Roy","doi":"10.24295/CPSSTPEA.2023.00053","DOIUrl":"https://doi.org/10.24295/CPSSTPEA.2023.00053","url":null,"abstract":"This article introduces an innovative single-source-based 19-level switched capacitor multilevel inverter (SCMLI) and its generalized structure. Unlike other SCMLIs, this proposed SCMLI eliminates the need for an H-bridge circuit for polarity generation, thereby reducing the inverter's total standing voltage (TSV). The article provides a circuit description of the proposed inverter, its operating principle, and the modulation strategy employed. Furthermore, the article outlines an optimal capacitor selection method and conducts various power loss analyses for the 19-level proposed SCMLI. A detailed comparative study with similar SCMLIs shows that the proposed SCMLI achieves higher output voltage levels while utilizing fewer components such as switches, drivers, diodes and capacitors. Furthermore, it offers a more cost-effective function per output voltage level than recently reported similar SCMLIs. An extensive experimental study has been conducted on a prototype of the 19-level SCMLI to validate its performance.","PeriodicalId":100339,"journal":{"name":"CPSS Transactions on Power Electronics and Applications","volume":"9 2","pages":"175-189"},"PeriodicalIF":0.0,"publicationDate":"2024-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10379582","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141500380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An Initial Solution Based Selective Harmonic Elimination Method for Multilevel Inverter 基于初始解的多电平逆变器选择性谐波消除方法
CPSS Transactions on Power Electronics and Applications Pub Date : 2024-01-02 DOI: 10.24295/CPSSTPEA.2023.00049
Peeyush Kala;Abhinav Sharma;Vibhu Jately;Jyoti Joshi;Yongheng Yang
{"title":"An Initial Solution Based Selective Harmonic Elimination Method for Multilevel Inverter","authors":"Peeyush Kala;Abhinav Sharma;Vibhu Jately;Jyoti Joshi;Yongheng Yang","doi":"10.24295/CPSSTPEA.2023.00049","DOIUrl":"https://doi.org/10.24295/CPSSTPEA.2023.00049","url":null,"abstract":"This article presents an initial solution based selective harmonic elimination (SHE) method for multilevel inverter (MLI) that aims to solve SHE problem with high accuracy while significantly reducing the number of iterations. Initial SHE solution is defined as a set of initial switching angles that has less accuracy as compared to the final SHE solution. To find initial SHE solution, tunicate swarm algorithm (TSA), grey wolf optimization (GWO) and whale optimization (WO) are used to solve five-dimensional SHE problem. A comparative analysis demonstrates that TSA achieved the desired initial SHE solution within lesser iterations as compared to GWO and WO for a wide range of modulation indices. The initial switching angles found using TSA are further optimized using Newton-Raphson (NR) method being the proposed TSANR method, which exploits the SHE search space with quadratic rate of convergence to find final SHE solution. The proposed TSANR method significantly minimizes the computational time and further improves the accuracy of the SHE solution as compared to the state-of-the-art SHE methods. Detailed simulations, experimental and harmonic analysis under dynamic change in modulation index are presented to show the efficacy of the proposed SHE method in terms of control over fundamental and detrimental harmonics.","PeriodicalId":100339,"journal":{"name":"CPSS Transactions on Power Electronics and Applications","volume":"9 1","pages":"63-78"},"PeriodicalIF":0.0,"publicationDate":"2024-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10379578","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140351533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Bond Wire Aging Monitoring Method for IGBT Modules Based on Back Propagation Neural Networks 基于反向传播神经网络的 IGBT 模块键合导线老化监测方法
CPSS Transactions on Power Electronics and Applications Pub Date : 2023-12-19 DOI: 10.24295/CPSSTPEA.2023.00048
Gengle Liang;Xinglai Ge;Huimin Wang;Zhiliang Xu;Dong Luo;Yi Wang
{"title":"A Bond Wire Aging Monitoring Method for IGBT Modules Based on Back Propagation Neural Networks","authors":"Gengle Liang;Xinglai Ge;Huimin Wang;Zhiliang Xu;Dong Luo;Yi Wang","doi":"10.24295/CPSSTPEA.2023.00048","DOIUrl":"https://doi.org/10.24295/CPSSTPEA.2023.00048","url":null,"abstract":"A typical degradation mechanism of insulated gate bipolar transistor (IGBT) modules is the bond wire degradation (BWD), and thus the bond wire aging monitoring (AM) shows much attractiveness for IGBT modules. However, the performance degradation with junction temperature swings and load current dependence in many bond wire AM methods remains an obstacle. To address this, a bond wire AM method based on the back propagation neural networks (BPNN) is proposed in this paper, in which the on-state voltage drop (OVD) is used as the indicator of bond wire AM. In the proposed AM method, a multi-physical field coupling model of the IGBT module is established. Then, with the assistance of the model, the characterization behaviors of the OVD are thoroughly analyzed. According to the analysis, it is known that the junction temperature swings and load current dependence may obviously degrade the performance of the proposed AM method. Afterward, BPNN is adopted to deal with these issues. Finally, the performance of the proposed AM method is explored through extensive experimental tests.","PeriodicalId":100339,"journal":{"name":"CPSS Transactions on Power Electronics and Applications","volume":"9 1","pages":"39-50"},"PeriodicalIF":0.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10365717","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140351451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Modular Multiport DC-DC Converter With MVDC Integration for Multiple DC Units 为多个直流装置集成 MVDC 的模块化多端口直流-直流转换器
CPSS Transactions on Power Electronics and Applications Pub Date : 2023-11-01 DOI: 10.24295/CPSSTPEA.2023.00047
Xiaoquan Zhu;Jintao Hou;Ke Jin;Bo Zhang
{"title":"A Modular Multiport DC-DC Converter With MVDC Integration for Multiple DC Units","authors":"Xiaoquan Zhu;Jintao Hou;Ke Jin;Bo Zhang","doi":"10.24295/CPSSTPEA.2023.00047","DOIUrl":"https://doi.org/10.24295/CPSSTPEA.2023.00047","url":null,"abstract":"This paper deals with a modular input-independent output-series (IIOS) multiport dc power electronic transformer (DCPET), which can interface with multiple dc units (such as PV array, storage devices and dc loads) to the medium-voltage dc (MVdc) bus directly without extra low-voltage dc (LVdc) converters. Therefore, the number of converters and the system expend are greatly reduced and saved when compared with the conventional dc distributed network. Due to the input power of these dc units are different and the multiple modules are in serial connection on MVdc side, which will lead to the output voltage imbalance between submodules (SMs). By inserting a single LC branch between adjacent SMs to transfer the differential power in the proposed topology, SM output voltage mismatched problem can be solved. Moreover, all SM power switches can realize zero voltage switching (ZVS), which further ameliorates the system efficiency. Finally, the above theoretical analysis is verified by simulation and experimental results, and the proposed multiport PET can operate stably in different working states.","PeriodicalId":100339,"journal":{"name":"CPSS Transactions on Power Electronics and Applications","volume":"9 1","pages":"99-111"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10304594","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140351414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Cascade-Formed Accurate Quasi-PR Controller Realization by Pole-Zero Placement 通过极点置零实现级联式精确准实时控制器
CPSS Transactions on Power Electronics and Applications Pub Date : 2023-11-01 DOI: 10.24295/CPSSTPEA.2023.00046
Chao Gao;Shuyu Zhang;Bo Lu;Wenlong Ding;Ka Nang Leung;Poh Chiang Loh
{"title":"A Cascade-Formed Accurate Quasi-PR Controller Realization by Pole-Zero Placement","authors":"Chao Gao;Shuyu Zhang;Bo Lu;Wenlong Ding;Ka Nang Leung;Poh Chiang Loh","doi":"10.24295/CPSSTPEA.2023.00046","DOIUrl":"https://doi.org/10.24295/CPSSTPEA.2023.00046","url":null,"abstract":"PR controller has been widely researched in various control systems for its robustness and simplicity. However, a traditional PR controller with relatively small integral gain, used for higher-order harmonics to keep stability, will cause increases in magnitudes, and decreases in phase around resonant frequency, and jeopardize stability. These all call for a more precise realization of PR controller. This paper proposes a cascade-formed PR controller realization method, which proves to realize PR controller more accurately even with a relatively small integral gain. The method is to decompose a PR controller into multiple independent PR units, and each PR unit is realized by mapping PR controller's parameters to its pole and zero positions. The distance between a pole-zero pair is found related to frequency characteristic error and is restricted accordingly to limit the error. Comprehensive comparisons of PR controllers realized by cascade form and the traditional parallel form have been conducted theoretically and experimentally, verifying that the cascade realization method is more accurate.","PeriodicalId":100339,"journal":{"name":"CPSS Transactions on Power Electronics and Applications","volume":"9 1","pages":"51-62"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10304593","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140351496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Magnetic Interference Suppression of Tunnel Magnetoresistance Current Sensor in Power Converters 抑制电源转换器中隧道磁阻电流传感器的磁场干扰
CPSS Transactions on Power Electronics and Applications Pub Date : 2023-10-13 DOI: 10.24295/CPSSTPEA.2023.00041
Hui Chen;Weicong Lin;Shuai Shao;Junming Zhang
{"title":"Magnetic Interference Suppression of Tunnel Magnetoresistance Current Sensor in Power Converters","authors":"Hui Chen;Weicong Lin;Shuai Shao;Junming Zhang","doi":"10.24295/CPSSTPEA.2023.00041","DOIUrl":"https://doi.org/10.24295/CPSSTPEA.2023.00041","url":null,"abstract":"Tunnel magnetoresistance (TMR) sensor is a promising candidate for current sensing with non-invasively measuring and very small footprint. However, in power converter products, the surrounding PCB tracks and magnetic components will generate magnetic fields, thereby affecting the current sampling accuracy of the TMR. This paper analyzes the influence of parallel and crossed PCB track currents and magnetic components in the power converter on the TMR measurement results and proposes methods to suppress magnetic field interference. For parallel PCB tracks, the design of spacing is used to reduce the interference, and the calculation of minimum spacing is given. A reasonable crossing angle design can reduce the crossed conductors' magnetic interference. For magnetic components, this paper selects the optimal installation position and layout to improve the detection accuracy of TMR. A prototype was built to demonstrate the feasibility of the proposed methods. With the optimized layout, the interference from parallel PCB tracks, cross tracks and magnetic components can be effectively suppressed, and the measured interference ratios are all within 5%.","PeriodicalId":100339,"journal":{"name":"CPSS Transactions on Power Electronics and Applications","volume":"8 4","pages":"437-446"},"PeriodicalIF":0.0,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10285630","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139109686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Voltage Compensation Control and Parameter Adaptive Design of Virtual DC Machine for Microgrid Energy Storage Converters 微电网储能变流器的电压补偿控制和虚拟直流机的参数自适应设计
CPSS Transactions on Power Electronics and Applications Pub Date : 2023-10-13 DOI: 10.24295/CPSSTPEA.2023.00045
Hailiang Xu;Honglong Zhang;Pingjuan Ge;Cong Wang
{"title":"Voltage Compensation Control and Parameter Adaptive Design of Virtual DC Machine for Microgrid Energy Storage Converters","authors":"Hailiang Xu;Honglong Zhang;Pingjuan Ge;Cong Wang","doi":"10.24295/CPSSTPEA.2023.00045","DOIUrl":"https://doi.org/10.24295/CPSSTPEA.2023.00045","url":null,"abstract":"To enhance the stability of a DC microgrid, a promising approach is to control the energy storage converter via the virtual DC machine control (VDMC), which can improve inertia and damping of the system. However, the conventional VDMC suffers from poor dynamic performance during large disturbances, partially due to its fixed control parameters. To track such problem, this paper proposes a voltage compensation control and parameter adaptive method for the VDMC of microgrid energy storage converters. Firstly, the dynamic process of microgrid bus voltage under disturbance is analyzed, and an armature voltage compensation control loop is then constructed. Subsequently, the influences of inertia, damping and compensation coefficients on the system dynamic characteristics are evaluated, and a parameter adaptive control method for the improved VDMC is proposed. Simulation and experimental results demonstrate that the proposed control strategy can effectively mitigate the DC bus voltage fluctuations, with faster response and smaller overshoot than the conventional VDMC strategy.","PeriodicalId":100339,"journal":{"name":"CPSS Transactions on Power Electronics and Applications","volume":"9 1","pages":"90-98"},"PeriodicalIF":0.0,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10285633","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140351413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Detection and Mitigation via Alternative Data for False Data Injection Attacks in DC Microgrid Cluster 通过替代数据检测和缓解直流微电网集群中的虚假数据注入攻击
CPSS Transactions on Power Electronics and Applications Pub Date : 2023-10-13 DOI: 10.24295/CPSSTPEA.2023.00043
Sucheng Liu;Guanggan Hu;Mengyu Xia;Qianjin Zhang;Wei Fang;Xiaodong Liu
{"title":"Detection and Mitigation via Alternative Data for False Data Injection Attacks in DC Microgrid Cluster","authors":"Sucheng Liu;Guanggan Hu;Mengyu Xia;Qianjin Zhang;Wei Fang;Xiaodong Liu","doi":"10.24295/CPSSTPEA.2023.00043","DOIUrl":"https://doi.org/10.24295/CPSSTPEA.2023.00043","url":null,"abstract":"DC microgrid clusters (DCMGCs), as deeply integrated cyber-physical systems, are formed by interconnection of multiple DC microgrids, and use distributed control to achieve power distribution with high reliability and scalability, and further reflect advantages of distributed energy resources-based generations. However, sharing of information among control agents by distributed manner in the DCMGCs renders the systems vulnerable to cyber-attacks. Among various cyber-attacks, false data injection attacks (FDIAs) can be carefully designed as stealth attacks, which can cause errors in the power management of DC-MGCs without manifestation of instability phenomena and even mislead existing detection methods to make incorrect judgments. To address this issue, this paper presents an alternative data-based strategy to detect FDIAs and mitigate the impact of the attacks in cyber network of DCMGCs. The classification conditions of FDIAs are discussed according to the different responses of DC-MGCs to the attacks. Furthermore, the core detection problem is transformed into identifying whether the system outputs match by selecting alternative communication data to circumvent complex modeling. Finally, hardware-in-the-loop experimental results on the dSPACE™ MicroLabBox platform with universal digital signal processing (DSP) controllers validate the proposed strategy.","PeriodicalId":100339,"journal":{"name":"CPSS Transactions on Power Electronics and Applications","volume":"9 1","pages":"27-38"},"PeriodicalIF":0.0,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10285632","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140351412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Critical Review of Vehicle-to-Everything (V2X) Topologies: Communication, Power Flow Characteristics, Challenges, and Opportunities 对车对物 (V2X) 拓扑的严格审查:通信、电力流特性、挑战和机遇
CPSS Transactions on Power Electronics and Applications Pub Date : 2023-10-13 DOI: 10.24295/CPSSTPEA.2023.00042
Gaurav Kumar;Suresh Mikkili
{"title":"Critical Review of Vehicle-to-Everything (V2X) Topologies: Communication, Power Flow Characteristics, Challenges, and Opportunities","authors":"Gaurav Kumar;Suresh Mikkili","doi":"10.24295/CPSSTPEA.2023.00042","DOIUrl":"https://doi.org/10.24295/CPSSTPEA.2023.00042","url":null,"abstract":"The rise in demand for energy storage solutions and the widespread adoption of electric vehicles (EVs) have given rise to the creation of vehicle-to-everything (V2X) topologies. V2X technology enables communication and power flow between EVs, the grid, homes, buildings, and other loads. This paper provides an acute review of V2X topologies, including the communication and power flow between EVs and the grid, homes, vehicles, and loads. The different types of V2X communication, including IEEE standards, the 3rd Generation Partnership Project (3GPP), ISO standards, Wi-Fi, and Internet of Things (IoT)-based protocols, are discussed, along with their advantages and disadvantages. Finally, the challenges and opportunities for the adoption of V2X topologies are presented.","PeriodicalId":100339,"journal":{"name":"CPSS Transactions on Power Electronics and Applications","volume":"9 1","pages":"10-26"},"PeriodicalIF":0.0,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10285631","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140351415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An Efficient Multi-Vector-Based Model Predictive Current Control for PMSM Drive 基于多矢量模型预测的 PMSM 驱动器高效电流控制
CPSS Transactions on Power Electronics and Applications Pub Date : 2023-09-29 DOI: 10.24295/CPSSTPEA.2023.00044
Jun Sun;Yong Yang;Rong Chen;Xinan Zhang;Chee Shen Lim;Jose Rodriguez
{"title":"An Efficient Multi-Vector-Based Model Predictive Current Control for PMSM Drive","authors":"Jun Sun;Yong Yang;Rong Chen;Xinan Zhang;Chee Shen Lim;Jose Rodriguez","doi":"10.24295/CPSSTPEA.2023.00044","DOIUrl":"https://doi.org/10.24295/CPSSTPEA.2023.00044","url":null,"abstract":"To address the problems of high current harmonics, large torque ripples, and heavy computational burden in the finite control set model predictive control (FCS-MPC), this paper proposes an efficient multi-vector model predictive current control (MPCC) scheme for permanent magnet synchronous motor (PMSM) drive. Firstly, a simple pre-selection method based on the trace of the stator current increment is proposed to obtain the candidate optimal voltage vectors. This pre-selection method avoids the heavy computational burden of evaluating all voltage vectors and is easy to implement. Then, to further reduce the torque ripples and current harmonics, the dwelling time of each voltage vector is achieved in inverse proportion to its cost function. Compared to the standard means, the proposed scheme is able to obtain great performance while greatly decreasing the computational burden and complexity. And its effectiveness is experimentally validated through comparative assessments.","PeriodicalId":100339,"journal":{"name":"CPSS Transactions on Power Electronics and Applications","volume":"9 1","pages":"79-89"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10268362","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140351495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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