发布求助
文献互助 智能选刊 最新文献

2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)最新文献

筛选
英文 中文
GaN-Based Active Clamp Flyback Converter Realizing Soft-Switching over Wide Voltage Range through Auxiliary Leakage Inductor 基于氮化镓的有源箝位反激变换器通过辅助漏电感实现宽电压范围软开关
2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) Pub Date : 2023-06-09 DOI: 10.1109/PEDG56097.2023.10215286
Lunbo Deng, Guohua Zhou, Yang Li, Haikun Yu
{"title":"GaN-Based Active Clamp Flyback Converter Realizing Soft-Switching over Wide Voltage Range through Auxiliary Leakage Inductor","authors":"Lunbo Deng, Guohua Zhou, Yang Li, Haikun Yu","doi":"10.1109/PEDG56097.2023.10215286","DOIUrl":"https://doi.org/10.1109/PEDG56097.2023.10215286","url":null,"abstract":"Active clamp flyback (ACF) converters commonly take magnetizing inductor energy to realize zero-voltage-switching (ZVS) in low output power. However, the output power could be improved by realizing ZVS through the leakage inductor. This paper analyzes the detailed operation principle with the consideration of parasitic parameters, then presents a design and debugging process by adding auxiliary leakage inductance to help realize ZVS over wide voltage range. The effectiveness of auxiliary leakage inductance design is verified with a 200W prototype working at 500kHz.","PeriodicalId":386920,"journal":{"name":"2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131265629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Interharmonic Compensation and Voltage Flicker Suppression with Cascaded STATCOM in Renewable Energy Based Weak Grid 基于可再生能源的弱电网级联STATCOM的谐波间补偿与电压闪变抑制
2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) Pub Date : 2023-06-09 DOI: 10.1109/PEDG56097.2023.10215276
Kevin Liu, Chen Xu, Fei Wang
{"title":"Interharmonic Compensation and Voltage Flicker Suppression with Cascaded STATCOM in Renewable Energy Based Weak Grid","authors":"Kevin Liu, Chen Xu, Fei Wang","doi":"10.1109/PEDG56097.2023.10215276","DOIUrl":"https://doi.org/10.1109/PEDG56097.2023.10215276","url":null,"abstract":"Voltage flicker, one of the significant power quality issues, is caused by the injection of interharmonic currents. It will be more critical in renewable energy based weak grid. In this paper, a delta-connected cascaded static var compensator is employed to compensate the interharmonic currents produced by a three-phase electric arc furnace load, simultaneously suppressing the voltage flicker. The actual interharmonic load currents acquired from an industrial site are analyzed and their influence on the voltage flicker is revealed. The compensation strategy including the current command extraction, voltage and current dual close-loop adjustment, and the capacitor voltage balance algorithm, is elaborated in detail. Different simulation results are carefully designed and compared with different parameters of the low-pass filters in the current command extraction process, as well as variable grid impedance values.","PeriodicalId":386920,"journal":{"name":"2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131855033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Closed-Loop Control for Cascaded Bidirectional Buck+Boost Converter with A Low-Loss Modulaiton Strategy 基于低损耗调制策略的级联双向降压+升压变换器闭环控制
2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) Pub Date : 2023-06-09 DOI: 10.1109/PEDG56097.2023.10215294
Jianhua Lei, Hongsheng Jiang
{"title":"Closed-Loop Control for Cascaded Bidirectional Buck+Boost Converter with A Low-Loss Modulaiton Strategy","authors":"Jianhua Lei, Hongsheng Jiang","doi":"10.1109/PEDG56097.2023.10215294","DOIUrl":"https://doi.org/10.1109/PEDG56097.2023.10215294","url":null,"abstract":"Compared with the traditional centralized battery energy storage system, the resident battery energy storage system has the advantages of high flexibility, high control granularity and high efficiency. Focus on this resident application, the bidirectional non-insolated DC-DC converter directly connected to battery modules is the key components. For the optimization of the conversion efficiency, the low-loss modulation strategy with PWM plus phase shift is analyzed considering the zero-voltage switching (ZVS) conditions and loss distribution. On this basis, the constant voltage control scheme in both step-down and step-up modes are proposed under the restriction of ZVS constraints. The experimental results show the feasibility and effectiveness of theoretical analysis, modulation strategy and control scheme.","PeriodicalId":386920,"journal":{"name":"2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"48 1-2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116590033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
PEDF (Photovoltaics, Energy Storage, Direct Current, Flexibility) Microgrid Cost Optimization Based on Improved Whale Optimization Algorithm 基于改进Whale优化算法的PEDF(光伏、储能、直流、柔性)微电网成本优化
2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) Pub Date : 2023-06-09 DOI: 10.1109/PEDG56097.2023.10215118
Yijun Wang, Yuxin Liu, Kexu Zhao, Haotian Deng, Feng Wang, F. Zhuo
{"title":"PEDF (Photovoltaics, Energy Storage, Direct Current, Flexibility) Microgrid Cost Optimization Based on Improved Whale Optimization Algorithm","authors":"Yijun Wang, Yuxin Liu, Kexu Zhao, Haotian Deng, Feng Wang, F. Zhuo","doi":"10.1109/PEDG56097.2023.10215118","DOIUrl":"https://doi.org/10.1109/PEDG56097.2023.10215118","url":null,"abstract":"\"Photovoltaic, Energy storage, Direct current, Flexibility\" (PEDF) microgrid, which is an important implementation scheme of the dual-carbon target, the reduction of its overall cost is conducive to its faster promotion of popularization. Therefore, this paper proposes an Improved Whale Optimization Algorithm (IWOA) for PEDF microgrid cost optimization, which can effectively improve the convergence speed of the algorithm as well as reduce the system cost under the consideration of electric vehicle charging load connected to PEDF microgrid. Firstly, the fitness function and related constraints are introduced, then the charging load of EV is predicted using Monte Carlo algorithm. Next, while introducing the traditional Whale Optimization Algorithm (WOA), the population initialization strategy, probability judgment condition, convergence factor and disturbance factor are improved. Finally, IWOA's cost optimization effect under three typical weather scenarios is compared with traditional WOA, Genetic Algorithm and Particle Swarm Optimization Algorithm, which proves IWOA's effectiveness considering improving the convergence speed and reducing system cost.","PeriodicalId":386920,"journal":{"name":"2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128401442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Research on Control Strategy of Energy Storage System Based on Day-ahead Energy Prediction 基于日前能量预测的储能系统控制策略研究
2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) Pub Date : 2023-06-09 DOI: 10.1109/PEDG56097.2023.10215243
Muchao Xiang, Zaixun Ling, Linjie Zhu, Yiming Gu, Zhe Zhang, Liang Huang
{"title":"Research on Control Strategy of Energy Storage System Based on Day-ahead Energy Prediction","authors":"Muchao Xiang, Zaixun Ling, Linjie Zhu, Yiming Gu, Zhe Zhang, Liang Huang","doi":"10.1109/PEDG56097.2023.10215243","DOIUrl":"https://doi.org/10.1109/PEDG56097.2023.10215243","url":null,"abstract":"As the number of new energy vehicles continues to rise, the demand for charging facilities is also increasing. The new energy production and consumption system represented by \"optical storage and charging\" will play an important role in achieving carbon neutrality. However, \"optical storage and charging\" integrated charging stations generally have problems such as poor photovoltaic energy absorption capacity, negative impact of load characteristics on the power grid, and low economic benefits. In view of the above phenomena, this paper takes the integrated charging station of \"optical storage and charging\" as the research object, and proposes a control strategy of energy storage system based on day-ahead energy prediction, Firstly, the day-ahead PV generation curve and EV charging curve are predicted, and then the model is modeled with the goal of minimizing the all-day electricity purchase cost and reducing the peak load as the constraint condition. The optimal solution is obtained by using the linear programming algorithm, and the feasibility and effectiveness of the strategy are verified by an example in the MATLAB simulation environment.","PeriodicalId":386920,"journal":{"name":"2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128224557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Topology-aware Iterative Method for Large-scale Power Electronic Systems with Stray Parameters 具有杂散参数的大型电力电子系统拓扑感知迭代方法
2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) Pub Date : 2023-06-09 DOI: 10.1109/PEDG56097.2023.10215133
Han Xu, Zhengming Zhao, Bochen Shi, Yangbin Zeng, Jialin Zheng, Weicheng Liu, Di Mou, Haoyu Wang
{"title":"Topology-aware Iterative Method for Large-scale Power Electronic Systems with Stray Parameters","authors":"Han Xu, Zhengming Zhao, Bochen Shi, Yangbin Zeng, Jialin Zheng, Weicheng Liu, Di Mou, Haoyu Wang","doi":"10.1109/PEDG56097.2023.10215133","DOIUrl":"https://doi.org/10.1109/PEDG56097.2023.10215133","url":null,"abstract":"Power electronic systems are crucial in modern power grids. Accurate offline simulation tools are essential for analyzing such systems. However, the accurate simulation of large-scale power electronic systems is time-consuming especially when stray parameters are considered. This paper proposes a topology-aware iterative method to improve solving efficiency for large-scale power electronic systems with stray parameters. The proposed method includes a topology-aware partitioning strategy and a flexible preconditioning method to efficiently construct preconditioners that can adapt to different topologies and step sizes. With this method, a large-scale solid-state transformer with stray parameters is efficiently simulated. Over 300-fold acceleration is achieved in total compared with commercial software. The method makes it possible to analyze and design large-scale power electronic systems more reliably.","PeriodicalId":386920,"journal":{"name":"2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127607135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A New Single-Switch Step-Up DC-DC Converter with High Gain, Reduced Voltage Stress, and Continuous Input Current 具有高增益、低电压应力和连续输入电流的新型单开关升压DC-DC变换器
2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) Pub Date : 2023-06-09 DOI: 10.1109/PEDG56097.2023.10215205
M. Abbasi, Li Li, R. Aguilera, D. Lu, Fei Wang
{"title":"A New Single-Switch Step-Up DC-DC Converter with High Gain, Reduced Voltage Stress, and Continuous Input Current","authors":"M. Abbasi, Li Li, R. Aguilera, D. Lu, Fei Wang","doi":"10.1109/PEDG56097.2023.10215205","DOIUrl":"https://doi.org/10.1109/PEDG56097.2023.10215205","url":null,"abstract":"Generally, renewable energy sources (RESs) such as solar and wind energy systems have variable output due to their dependence on the weather condition. Hence, numerous converter structures with variable voltage gain have been introduced, which can be used to regulate the output voltage of RESs. Providing a high dynamic voltage gain with even a small input voltage was realized by developing conventional DC-DC converters, such as Zeta, Sepic, and Cuk Converters. But these conventional converters cannot provide high voltage gains with non-extreme duty cycles. In this paper, it is aimed to design a new single-switch DC-DC power converter without employing a large number of components. This topology provides higher dynamic voltage gain with a lower duty cycle, continuous input current, and lower voltage stress on the components. The performance of the converter is proved by comparison and simulation results obtained in MATLAB/Simulink environment.","PeriodicalId":386920,"journal":{"name":"2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130725530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
High-Performance Global Maximum Power Point Tracking for Partial Shaded Photovoltaic Systems 部分遮阳光伏系统的高性能全局最大功率点跟踪
2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) Pub Date : 2023-06-09 DOI: 10.1109/PEDG56097.2023.10215238
Yi Zhu, Yongheng Yang
{"title":"High-Performance Global Maximum Power Point Tracking for Partial Shaded Photovoltaic Systems","authors":"Yi Zhu, Yongheng Yang","doi":"10.1109/PEDG56097.2023.10215238","DOIUrl":"https://doi.org/10.1109/PEDG56097.2023.10215238","url":null,"abstract":"Conventional global maximum power point tracking (GMPPT) control for photovoltaic (PV) systems shows certain limitations in terms of convergence speed and tracking accuracy, resulting from the sophisticated searching mechanism to ensure the operation under partial shading conditions (PSCs). To address these issues, in this paper, a high-performance GMPPT (HP-GMPPT) method is proposed with a modified explicit PV model to express the global maximum power point directly, thus, effectively reducing the invalid searching in conventional solutions. Notably, in this paper, the requirement for irradiance measurement in the conventional explicit PV model is eliminated after sufficient modification by integrating a low-cost irradiance estimation mechanism. It is cost-effective for the existing PV systems. To validate the proposed HP-GMPPT method, simulation evaluations and comparisons are carried out under various PSC scenarios.","PeriodicalId":386920,"journal":{"name":"2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133226590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Full Comparison between Droop Control and Virtual Synchronous Generator Control Considering Reactive Power Dynamics in Grid-Forming Inverters 并网逆变器中考虑无功动态的下垂控制与虚拟同步发电机控制的全面比较
2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) Pub Date : 2023-06-09 DOI: 10.1109/PEDG56097.2023.10215129
Jiazhi Wang, Zeng Liu, Yidong Shi, Jinjun Liu
{"title":"A Full Comparison between Droop Control and Virtual Synchronous Generator Control Considering Reactive Power Dynamics in Grid-Forming Inverters","authors":"Jiazhi Wang, Zeng Liu, Yidong Shi, Jinjun Liu","doi":"10.1109/PEDG56097.2023.10215129","DOIUrl":"https://doi.org/10.1109/PEDG56097.2023.10215129","url":null,"abstract":"With the growing penetration ratio of renewable energy sources in the power grid, the grid-forming inverters arrest great attention owing to improved stability and frequency supporting ability. Usually, the droop control and the virtual synchronous generator control are two commonly utilized power distribution strategies among paralleled grid-forming inverters. This paper gives a full comparison between these two control strategies considering both active and reactive power dynamics. Meanwhile, the small-signal dynamics on both grid-connected operation and stand-alone operation are also compared. Moreover, the unity between these two control strategies is explored, considering the detailed implementation of virtual synchronous generator control. The implicit droop characteristics of virtual impedance are also derived. The theoretical results are verified by software simulations and hardware experiments.","PeriodicalId":386920,"journal":{"name":"2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133648248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Research on Cluster DC Voltage Balancing of Star-Connected Cascaded H-bridge STATCOM 星形连接级联h桥STATCOM集群直流电压平衡研究
2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) Pub Date : 2023-06-09 DOI: 10.1109/PEDG56097.2023.10215187
Kai Hu, Guoliang Zhao, Zhengang Lu, Hongyan Yu, Weiguo Li, Chaobo Dai
{"title":"The Research on Cluster DC Voltage Balancing of Star-Connected Cascaded H-bridge STATCOM","authors":"Kai Hu, Guoliang Zhao, Zhengang Lu, Hongyan Yu, Weiguo Li, Chaobo Dai","doi":"10.1109/PEDG56097.2023.10215187","DOIUrl":"https://doi.org/10.1109/PEDG56097.2023.10215187","url":null,"abstract":"Star-connected cascaded H-bridge STATCOMs are widely used in power systems due to their modular performance, small output harmonics, and applicability to high voltage. However, the uneven losses of three phases and the unbalanced active power generated by unbalance grid voltages lead to the problem of phase to phase DC voltage unbalance in star-connected cascaded H-bridge STATCOMs. The clustered DC voltage balancing control using zero sequence voltage injection is suitable for star-connected cascaded H-bridge STATCOMs because no zero-sequence current is generated in the three-phase three-wire system. However, the conventional zero-sequence voltage injection method contains many complex operations, such as trigonometric operations, square root and inverse trigonometric operations, etc. These complex operations increase the computational burden of the controller. In order to eliminate the complex operations of the traditional method, this paper proposes an improved phase-to-phase DC voltage equalization control strategy by deriving the active power relationship of the three phases of STATCOM, which has no complex operations such as inverse trigonometric function, and also extracts the unbalanced power directly from the grid voltage as feedforward control, which improves the control effect and dynamic performance of phase-to-phase DC voltage equalization. Finally, the effectiveness of the proposed control method is verified by simulation.","PeriodicalId":386920,"journal":{"name":"2023 IEEE 14th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114344757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信