IET Power Electronics最新文献

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Serial resonant converter (SRC) polynomial model implemented in a digital signal controller (DSC)
IF 1.7 4区 工程技术
IET Power Electronics Pub Date : 2024-10-21 DOI: 10.1049/pel2.12809
Juan Díaz Gonzalez, Evode Rwamurangwa, Pedro Jose Villegas Saiz, Juan Antonio Martin-Ramos, Alberto Martin Pernia, María G. Busto
{"title":"Serial resonant converter (SRC) polynomial model implemented in a digital signal controller (DSC)","authors":"Juan Díaz Gonzalez,&nbsp;Evode Rwamurangwa,&nbsp;Pedro Jose Villegas Saiz,&nbsp;Juan Antonio Martin-Ramos,&nbsp;Alberto Martin Pernia,&nbsp;María G. Busto","doi":"10.1049/pel2.12809","DOIUrl":"https://doi.org/10.1049/pel2.12809","url":null,"abstract":"<p>This work describes the process of modelling resonant converters by means of polynomial equations, in such a way that they can be easily implemented in digital controllers as digital signal controller. As an example, the serial resonant converter is modelled and its implementation in the TMS320F28335 Texas Controller.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"17 16","pages":"2917-2929"},"PeriodicalIF":1.7,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.12809","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143253146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigation of microwave power transfer near sea surface with 2D parabolic equation method 用二维抛物线方程法研究海面附近的微波功率传输
IF 1.7 4区 工程技术
IET Power Electronics Pub Date : 2024-10-19 DOI: 10.1049/pel2.12770
Jinyi Hui, Rong Bao, Jingkuan Mu, Xiang Chi, Chunliang Liu
{"title":"Investigation of microwave power transfer near sea surface with 2D parabolic equation method","authors":"Jinyi Hui,&nbsp;Rong Bao,&nbsp;Jingkuan Mu,&nbsp;Xiang Chi,&nbsp;Chunliang Liu","doi":"10.1049/pel2.12770","DOIUrl":"https://doi.org/10.1049/pel2.12770","url":null,"abstract":"<p>Due to the existence of the evaporation duct near-sea-surface described as an inhomogeneous refractive index of atmosphere, microwaves can be trapped in the duct and propagate along it. To investigate wireless power transfer (WPT) over the sea surface, we utilize the two-dimensional parabolic equation to calculate the electric field distribution and to obtain the transferred power. By analysing the propagation results with specific evaluation functions, we obtained the proper conditions for long-distance WPT over the sea surface. When the initial field distributes uniformly on the one-meter aperture, the frequency is 12 GHz, and the centre position is 4 m, a unique focusing spot can be obtained in the duct and nearly 5%, 8%, and 12% of the initial power remains at a distance of 10 km with a receiving aperture of 1, 2, and 3 m, respectively. The presented WPT scheme near the sea surface has potential applications in the power supply or charging for ships or small islands.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"17 15","pages":"2278-2287"},"PeriodicalIF":1.7,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.12770","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142707959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","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 single phase nine level common ground switched capacitor inverter with double boosting capability
IF 1.7 4区 工程技术
IET Power Electronics Pub Date : 2024-10-19 DOI: 10.1049/pel2.12804
Md Adil Azad, Adil Sarwar, Mohammad Zaid, Mohd Tariq, Farhad Ilahi Bakhsh, Shafiq Ahmad, Abdelaty Edrees Sayed, Md Rasidul Islam
{"title":"A single phase nine level common ground switched capacitor inverter with double boosting capability","authors":"Md Adil Azad,&nbsp;Adil Sarwar,&nbsp;Mohammad Zaid,&nbsp;Mohd Tariq,&nbsp;Farhad Ilahi Bakhsh,&nbsp;Shafiq Ahmad,&nbsp;Abdelaty Edrees Sayed,&nbsp;Md Rasidul Islam","doi":"10.1049/pel2.12804","DOIUrl":"https://doi.org/10.1049/pel2.12804","url":null,"abstract":"<p>This article suggests a nine-level (9L) seven-switch (7S) transformer-less (TL) common-ground (CG) switched capacitor (SC) inverter with double boosting capability. The proposed 9L7S-CGSC-TL inverter comprises only seven switches (7S), two diodes, three self-balanced capacitors, and one DC source. The suggested inverter has a CG connection which eliminates ground leakage currents. Additionally, the suggested topology necessitates fewer conducting devices, thereby reducing conduction losses. The voltage across every capacitor is automatically balanced within each fundamental cycle. The proposed topology has been evaluated based on parameters such as component count, total harmonic distortion, cost, and efficiency. The proposed configuration switching sequence is governed by employing the level-shifted pulse width modulation technique. A power loss study was conducted to determine the efficiency of the proposed switched capacitor multilevel inverter (SCMLI) under different load conditions in PLECS. The results shows that the proposed SCMLI achieves a peak efficiency of 98.17%. Further, the lifespan of the proposed SCMLI is assessed through a reliability assessment. The simulation and experimental results at different conditions are presented and elucidated.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"17 16","pages":"2900-2916"},"PeriodicalIF":1.7,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.12804","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143253002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Robust sliding mode control for the MMC-HVDC transmission system with SCR uncertainty 具有可控硅不确定性的 MMC-HVDC 输电系统的稳健滑模控制
IF 1.7 4区 工程技术
IET Power Electronics Pub Date : 2024-10-19 DOI: 10.1049/pel2.12805
Farzin Gharaghani, Mehdi Asadi
{"title":"Robust sliding mode control for the MMC-HVDC transmission system with SCR uncertainty","authors":"Farzin Gharaghani,&nbsp;Mehdi Asadi","doi":"10.1049/pel2.12805","DOIUrl":"https://doi.org/10.1049/pel2.12805","url":null,"abstract":"<p>Modular multilevel green converter based high voltage direct current (MMC-HVDC) transmission system has become a practical solution to interconnect renewable energy sources to main AC grids. Connecting the MMC to a weak AC system is still a challengeable problem. This paper proposes a sliding mode control-based method for the MMC. By considering short circuit ratio parameter of the AC grid as uncertainty, a suitable mathematical model is developed. Also, relations among control parameters and their validity conditions are obtained. The proposed control scheme has faster dynamic responses to uncertainty and external disturbances compared to the conventional vector current control method with proportional–integral controller. At last, simulation results in the MATLAB/SIMULINK software environment are presented that the proposed control scheme is effective.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"17 15","pages":"2549-2560"},"PeriodicalIF":1.7,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.12805","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142707910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Disturbance-rejection adjacent vector model predictive control strategy based on extended state observer for EV converter 基于扩展状态观测器的电动汽车变流器干扰抑制邻近矢量模型预测控制策略
IF 1.7 4区 工程技术
IET Power Electronics Pub Date : 2024-10-19 DOI: 10.1049/pel2.12807
Jianwei Zhang, Qiaosen Cao, Guangchen Liu, Marco Rivera, Patrick Wheeler
{"title":"Disturbance-rejection adjacent vector model predictive control strategy based on extended state observer for EV converter","authors":"Jianwei Zhang,&nbsp;Qiaosen Cao,&nbsp;Guangchen Liu,&nbsp;Marco Rivera,&nbsp;Patrick Wheeler","doi":"10.1049/pel2.12807","DOIUrl":"https://doi.org/10.1049/pel2.12807","url":null,"abstract":"<p>Conventional single-vector model predictive control (MPC) can suffer from low control accuracy, while multi-vector MPC is often criticized for its complexity and heavy computational burden. In order to address these issues, an adjacent vector-based MPC is investigated in this paper for an electric vehicle battery charging and discharging converter. The voltage vector selection table based on the principle of using adjacent vectors has been designed and this reduces the number of iterations and thus the computational burden. A threshold is used in the adjacent vector-based MPC to coordinate the use of the single and multi-vector MPCs considering a balance between the control accuracy and computational burden. In addition, to enhance the robustness of MPC to parameter changes, an extended state observer for active disturbance rejection control has been used to derive the predictive model, and an adjacent vector-based MPC using extended state observer is studied. The method does not need accurate system parameters. Instead, it only requires the system input and output measurements to calculate the predicted current. The robustness of the controller against the parameter mismatch is enhanced compared to alternative approaches and the experimental results verify the feasibility and effectiveness of the proposed strategy.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"17 15","pages":"2572-2583"},"PeriodicalIF":1.7,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.12807","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142707911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Threshold voltage instability of SiC MOSFETs under very-high temperature and wide gate bias 超高温和宽栅偏压条件下 SiC MOSFET 的阈值电压不稳定性
IF 1.7 4区 工程技术
IET Power Electronics Pub Date : 2024-10-18 DOI: 10.1049/pel2.12786
Cong Chen, Yumeng Cai, Peng Sun, Zhibin Zhao
{"title":"Threshold voltage instability of SiC MOSFETs under very-high temperature and wide gate bias","authors":"Cong Chen,&nbsp;Yumeng Cai,&nbsp;Peng Sun,&nbsp;Zhibin Zhao","doi":"10.1049/pel2.12786","DOIUrl":"https://doi.org/10.1049/pel2.12786","url":null,"abstract":"<p>Threshold voltage (<i>V</i><sub>TH</sub>) instability affects the reliability of silicon carbide (SiC) MOSFETs. In this article, the influence of gate bias (<i>V</i><sub>GS</sub>) and high temperature on <i>V</i><sub>TH</sub> instability is investigated under wide <i>V</i><sub>GS</sub> and very-high temperature range (150°C to 275°C). The degradation mechanism of gate oxide under coupling of different electrical and thermal stress is revealed. When the device is subjected to +<i>V</i><sub>GS,</sub> the relationship between <i>V</i><sub>TH</sub> shift and temperature is not monotonic and there is a temperature turning point. This is mainly related to the capture/release and generation of electron traps. However, the <i>V</i><sub>TH</sub> shift increases sharply and gate oxide breakdown for the device bias at +35 V, which is related to Fowler–Nordheim (F–N) tunnelling effect. For a large −<i>V</i><sub>GS</sub>, the <i>V</i><sub>TH</sub> shift is very small. Moreover, when the negative <i>V</i><sub>GS</sub> decreases, the <i>V</i><sub>TH</sub> shift is positively correlated with temperature, which may result from the activation and charge exchange of hole traps. However, the influence of moving ions changes the temperature dependence of <i>V</i><sub>TH</sub> shift for the device bias at −30 V. Finally, the devices of different manufacturers are studied and similar change patterns are found. This finding provides guidance for the further application of SiC MOSFETs under high temperatures and different voltages.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"17 15","pages":"2393-2404"},"PeriodicalIF":1.7,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.12786","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142707694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Coati optimized FOPID controller for non-isolated DC–DC converters in EV charging application
IF 1.7 4区 工程技术
IET Power Electronics Pub Date : 2024-10-17 DOI: 10.1049/pel2.12798
Piyush Sharma, Dheeraj Kumar Palwalia, Ashok Kumar Sharma, Neeraj Priyadarshi, Sanjeevikumar Padmanaban
{"title":"Coati optimized FOPID controller for non-isolated DC–DC converters in EV charging application","authors":"Piyush Sharma,&nbsp;Dheeraj Kumar Palwalia,&nbsp;Ashok Kumar Sharma,&nbsp;Neeraj Priyadarshi,&nbsp;Sanjeevikumar Padmanaban","doi":"10.1049/pel2.12798","DOIUrl":"https://doi.org/10.1049/pel2.12798","url":null,"abstract":"<p>The transportation sector's shift from internal combustion engines to electric vehicles (EVs) has made enough charging facilities necessary. The converter's architecture has undergone several changes to provide the best possible charging for electric vehicles. For EV charging applications, both isolated and non-isolated converters are employed. The significant strain on switches and losses in the various converter topologies are among the main problems. To minimize these issues, the current-fed non-isolated DC–DC converter is proposed with fewer switching devices. The proposed converter design is validated for the EV charging application in the MATLAB/Simulink tool. Moreover, Coati optimized fractional order proportional integral derivative controller is proposed, which provides optimum switching signals for the converter based on the voltage input. Furthermore, the responses are realized for buck and boost modes of operations. It is verified that zero current switching and zero voltage switching are achieved under boost mode. The results analysis demonstrates that the proposed converter has a higher efficiency of 99.7% and 99.02% in buck and boost mode, respectively.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"17 16","pages":"2771-2784"},"PeriodicalIF":1.7,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.12798","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143252850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Multi-objective optimization of inductive power transfer system with reconfigurable topology for misalignment tolerance 采用可重构拓扑结构的电感式功率传输系统的多目标优化,以实现错位容差
IF 1.7 4区 工程技术
IET Power Electronics Pub Date : 2024-10-16 DOI: 10.1049/pel2.12766
Junfeng Yang, Qiujiang Liu, Xu Yang, Yanru Zhang
{"title":"Multi-objective optimization of inductive power transfer system with reconfigurable topology for misalignment tolerance","authors":"Junfeng Yang,&nbsp;Qiujiang Liu,&nbsp;Xu Yang,&nbsp;Yanru Zhang","doi":"10.1049/pel2.12766","DOIUrl":"https://doi.org/10.1049/pel2.12766","url":null,"abstract":"<p>At present, most of the analyses or studies about inductive power transfer (IPT) with constant current (CC) output and constant voltage (CV) output are carried out without considering misalignment conditions or different gaps. An IPT system satisfying battery charging demand and anti-misalignment requirements simultaneously is infrequent. This paper proposes a multi-objective particle swarm optimization method of IPT reconfigurable topology to realize CC and CV modes at varying resistance conditions and wide coupling ranges. The output characteristics of an inductor–capacitor–capacitor (LCC)–LCC compensation circuit have been explored, and it is found that the secondary-side compensated capacitors have a greater impact on the output power, which can be used to improve power regulation ability accompanied by coupling varying. Eight optimization compensated parameters of the reconfigurable topology are obtained from the Pareto front to achieve the required CC and CV charging outputs. By switching the compensated capacitors, the selected parameters can make the current and voltage fluctuation less than 9.3% and 7.9%, respectively, during the coupling charging range from 0.3 to 0.22. Moreover, primary zero voltage switching operation is achieved to enable high efficiency. The simulation and the experimental verification are carried out to verify the validity of the proposed method.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"17 15","pages":"2262-2277"},"PeriodicalIF":1.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.12766","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142707938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Design and implementation of a solar power optimizer for module level power electronics application 为模块级电力电子应用设计和实施太阳能优化器
IF 1.7 4区 工程技术
IET Power Electronics Pub Date : 2024-10-14 DOI: 10.1049/pel2.12801
Babak Allahverdinejad, Ali Ajami, Mohamad Reza Banaei
{"title":"Design and implementation of a solar power optimizer for module level power electronics application","authors":"Babak Allahverdinejad,&nbsp;Ali Ajami,&nbsp;Mohamad Reza Banaei","doi":"10.1049/pel2.12801","DOIUrl":"https://doi.org/10.1049/pel2.12801","url":null,"abstract":"<p>Partial shading on series-connected photovoltaic (PV) panels in conventional PV systems results in lower harvested power. To resolve this, it is vital to utilize module level power electronics (MLPE) such as Solar Power Optimizers (SPOs). This paper introduced a non-isolated common ground non-inverting output voltage buck-boost converter as an SPO. Proposed converter benefits from continuous input and output currents which has a significant role in designing SPOs. Having a quadratic gain, beside acceptable step-down range are other features of the converter. Operating principle, design, steady-state, small-signal analysis, and dynamic performance of proposed converter are included. Proposed converter is compared with other buck-boost converters in terms of voltage gain, voltage stresses, continuous input and output current, and output polarity. To validate the performance of introduced converter, experimental results for a prototype with input voltage 24 V, output voltage 72 V for step-up and 15 V for step-down modes are given and results are examined. The maximum efficiency of the prototype is 93% and 89% for step-up and step-down modes, respectively. To evaluate the effect of proposed SPO for extracting maximum available power from PVs, simulation results of a grid connected PV system with two series connected SPOs is discussed.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"17 15","pages":"2531-2548"},"PeriodicalIF":1.7,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.12801","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142707514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","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 non-isolated single-input dual-output DC–DC boost converter with high-voltage gain 具有高电压增益的非隔离式单输入双输出 DC-DC 升压转换器
IF 1.7 4区 工程技术
IET Power Electronics Pub Date : 2024-10-13 DOI: 10.1049/pel2.12792
Saeed Abbasi, Ali Nahavandi
{"title":"A non-isolated single-input dual-output DC–DC boost converter with high-voltage gain","authors":"Saeed Abbasi,&nbsp;Ali Nahavandi","doi":"10.1049/pel2.12792","DOIUrl":"https://doi.org/10.1049/pel2.12792","url":null,"abstract":"<p>This paper presents a new structure of a high step-up DC–DC converter. The proposed converter has one input and two outputs with different voltage levels, suitable for applications that require multiple voltage levels such as photovoltaic systems, electric vehicles and DC microgrids. The proposed converter is expandable to more outputs and has a higher voltage conversion ratio compared to similar converters. The operational modes of the proposed converter are investigated and the conversion ratio of the converter is obtained. Additionally, small-signal equations of the converter are derived, and using state-space matrices, transfer functions of the converter are obtained and the controller is designed. Also, the proposed converter is compared with similar converters and power losses equations of the converter are derived. To investigate the converter's performance, simulations are done using MATLAB/Simulink software. Moreover, to validate the theoretical analysis, a laboratory prototype is implemented. The obtained results confirm the operation of the proposed converter.</p>","PeriodicalId":56302,"journal":{"name":"IET Power Electronics","volume":"17 15","pages":"2451-2471"},"PeriodicalIF":1.7,"publicationDate":"2024-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/pel2.12792","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142707634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","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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