Yuting Yang, Dongqing Wang, Yongqiang Zheng, Youwei Yang
{"title":"EEG-based Emotion Recognition Using Multi-Dimensional Convolutional Neural LSTM via Attention Mechanism","authors":"Yuting Yang, Dongqing Wang, Yongqiang Zheng, Youwei Yang","doi":"10.1109/CIEEC58067.2023.10167160","DOIUrl":"https://doi.org/10.1109/CIEEC58067.2023.10167160","url":null,"abstract":"For emotion recognition, firstly, we transform the differential entropy and power spectral density features extracted from different channels of EEG signals into a spatial representation with a multi-dimensional structure. Secondly, a convolutional neural network (CNN) and a neural network with bidirectional long short-term memory (Bi-LSTM) are combined together to form a deep learning model. Among them, CNN extracts the effective frequency and spatial information in each time segment of the input EEG signal, and the Bi-LSTM strengthens the temporal dependence of the output information from CNN. Further, the attention enhancement mechanism is fused into the Bi-LSTM module to extract more discriminative spatial-temporal features. The proposed model is extensively trained and tested on DEAP dataset to verify its advantages in different aspects. The experimental findings show that the accuracy of emotion recognition is also enhanced to some degree.","PeriodicalId":185921,"journal":{"name":"2023 IEEE 6th International Electrical and Energy Conference (CIEEC)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127709065","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}
Haimeng Wang, Yifeng Zeng, T. Hu, Li Chen, Chen Hu
{"title":"Analysis of wide-pulse fault locating considering waveform distortion","authors":"Haimeng Wang, Yifeng Zeng, T. Hu, Li Chen, Chen Hu","doi":"10.1109/CIEEC58067.2023.10166114","DOIUrl":"https://doi.org/10.1109/CIEEC58067.2023.10166114","url":null,"abstract":"Since the narrow pulse has the defect of measuring blind area and the wave velocity has a great impact on the accuracy of fault location, a theory of eliminating the wave velocity of the wide pulse has been caught out, which has been verified in Simulink. In addition, since the pulse can be distorted during the transmission process of lossy transmission lines, which can affect the identification of the pulse edge, then affect the measurement time of the reflected pulse to the beginning terminal, considering the pulse edge is rich in detail components, wavelet analysis has been used to identify the edge. Moreover, lossy transmission line models have been established in ATP-EMTP to verify the theory. The simulation results have shown that through this method, the 4% relative error can be reduced to less than 0.02%. Both theory and simulation results have proved that the traditional pulse fault detection method can be improved.","PeriodicalId":185921,"journal":{"name":"2023 IEEE 6th International Electrical and Energy Conference (CIEEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126215240","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}
Wanting Jiang, Z. Lei, Qin He, Rui Cheng, Jieyou Li, Wei Li
{"title":"Effect of crystalline morphology of polypropylene on breakdown field strength","authors":"Wanting Jiang, Z. Lei, Qin He, Rui Cheng, Jieyou Li, Wei Li","doi":"10.1109/CIEEC58067.2023.10165838","DOIUrl":"https://doi.org/10.1109/CIEEC58067.2023.10165838","url":null,"abstract":"Polypropylene (PP) is studied as an environmentally friendly insulating material in high voltage direct current (HVDC) transmission such as the wind power grid connection, island power supply and long-distance transmission across the sea because of its excellent insulating properties. As a semi-crystalline polymer, PP's crystal structure determines the insulating properties. In this paper, pure isotactic PP samples with different crystalline morphology were prepared to investigate the effect of crystalline morphology on the breakdown field strength. According to the microstructure and DSC(differential scanning calorimetry) curve, the breakdown field strength of isotactic PP samples was discussed. The breakdown mechanism was analyzed. Due to the different crystalline morphology forming in samples, the electron transportation path changes, leading to the breakdown field strength change.","PeriodicalId":185921,"journal":{"name":"2023 IEEE 6th International Electrical and Energy Conference (CIEEC)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126427562","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}
Jun Yang, Chong Gao, Zhiyuan He, Dongshan He, Jing Zhang
{"title":"Dynamic performance of Controllable Line-Commutated Converter (CLCC) in HVDC systems with weak sending end AC network","authors":"Jun Yang, Chong Gao, Zhiyuan He, Dongshan He, Jing Zhang","doi":"10.1109/CIEEC58067.2023.10166312","DOIUrl":"https://doi.org/10.1109/CIEEC58067.2023.10166312","url":null,"abstract":"Both the sending end and the receiving end AC network of long distance HVDC systems are getting weaker and weaker, with fast growing renewable energy penetration under “dual carbon” scenario. The inherent defect of HVDC-commutation failure has become a more prominent problem. The Controllable Line-Commutated Converter (CLCC) raised recently has been proved to be effective to eliminate commutation failure. This paper aims to discuss the dynamic performance of CLCC in HVDC systems with weak sending end AC network. Firstly, the circuit topology and operation principle of CLCC are introduced. Then the dynamic performance of CLCC is theoretically analyzed. Finally, the dynamic performance of the proposed method is validated by simulation on the developed 500kV/1.2kA CLCC HVDC model in PSCAD/EMTDC. And the result shows that compared with LCC-HVDC system, CLCC-HVDC can significantly reduce the impact of active power and reactive power fluctuation imposed on the sending end AC network during the AC fault at the receiving end and greatly improve the stability of the electric power system.","PeriodicalId":185921,"journal":{"name":"2023 IEEE 6th International Electrical and Energy Conference (CIEEC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126565617","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}
{"title":"Influence of Slot/Pole Combinations on Torque Ripple in Partitioned Stator Doubly Salient Permanent Magnet Machines","authors":"G. Ming, Qiuhua Liu, Shihao Ma","doi":"10.1109/CIEEC58067.2023.10166498","DOIUrl":"https://doi.org/10.1109/CIEEC58067.2023.10166498","url":null,"abstract":"The Influence of slot/pole combinations on torque ripple in partitioned stator doubly salient permanent magnet (PS-DSPM) machines are comprehensively investigated. First, the slot/pole combinations for three-phase PS-DSPM machines are discussed. Then, a determination principle of the feasible slot/pole combinations is proposed for obtaining the approximately sinusoidal back-electromotive force (back-EMF) waveform, small cogging torque, and negligible reluctance torque. Furthermore, the unit PS-DSPM machines with proposed 18/5, 18/7, 18/11, 18/13, and 18/17 slot/pole combinations are compared against the conventional 18/12 PS-DSPM machine to verify the effectiveness of the proposed method to determine the slot/pole combinations. The results show that compared with the conventional 18/12 slot/pole combination, the proposed 18/5, 18/7, 18/11, 18/13, and 18/17 slot/pole combinations can significantly decrease torque ripple.","PeriodicalId":185921,"journal":{"name":"2023 IEEE 6th International Electrical and Energy Conference (CIEEC)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125741271","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}
{"title":"Numerical simulation investigation of the internal flow field for wind tunnel","authors":"Xinyang Hong, Zhuohuan Hu, Shuyu Gao","doi":"10.1109/CIEEC58067.2023.10165784","DOIUrl":"https://doi.org/10.1109/CIEEC58067.2023.10165784","url":null,"abstract":"Numerical simulation was applied to study the flow field in the wind tunnel. Two different combinations for nozzles were analyzed, and the characteristic of flow filed for several different rectifier thicknesses (5mm, 10mm and 15mm) in the wind tunnel were also compared. The results show that, under the same inlet velocity, the velocity of airflow after the second rectifiers for adjacent opening nozzles is larger than those for diagonal opening nozzles. However, diagonal opening nozzles made the subsequent flow field more uniform and smooth. Furthermore, with the increase of rectifier thickness, the flow filed after the second rectifier appears much more even.","PeriodicalId":185921,"journal":{"name":"2023 IEEE 6th International Electrical and Energy Conference (CIEEC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125790641","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}
{"title":"Hybrid Converter Cell-Based Buck-Type Bridgeless PFC Converters With Low THD","authors":"Zhengge Chen, Jin Qi, Xinfa Chen, Jianping Xu","doi":"10.1109/CIEEC58067.2023.10166117","DOIUrl":"https://doi.org/10.1109/CIEEC58067.2023.10166117","url":null,"abstract":"AC-DC buck power factor correction (PFC) converters with relatively high efficiency are good candidates in low-voltage applications. However, they typically suffer from high input current total harmonics distortions (THDi) caused by the input current dead zones. Thus, this paper proposes four hybrid cell-based buck-type bridgeless PFC converters by using the buck and buck-boost or flyback converter cells. Thanks to the buck-boost/flyback operation in one half-line cycle, the dead zones can be minimized and thus the reduced THDi. The operation modes of one proposed bridgeless topology are introduced, followed by a theoretical analysis. Validations of the proposed converters are conducted in simulations, along with the comparison with other buck-type PFC converters.","PeriodicalId":185921,"journal":{"name":"2023 IEEE 6th International Electrical and Energy Conference (CIEEC)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127911418","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}
{"title":"Cooperative Control Strategy of Triple Redundant Motor Based on Virtual Impedance","authors":"Zhenwei Hu, Yaohua, Renhua Jiang, Zhiwei Pan, Shushu Zhu","doi":"10.1109/CIEEC58067.2023.10167329","DOIUrl":"https://doi.org/10.1109/CIEEC58067.2023.10167329","url":null,"abstract":"The motor for electromechanical actuator has high reliability requirements. This paper studies a triple redundancy permanent magnet synchronous motor with winding redundancy structure. However, the triple redundancy system has the problem of asymmetric channel parameters, which leads to unbalanced winding phase current and affects the reliability of the triple redundancy permanent magnet synchronous motor. In this paper, the possible consequences of parameter asymmetry are analyzed. Aiming at the problem of stator current imbalance caused by parameter asymmetry, a cooperative control strategy based on virtual impedance is proposed. The control strategy compensates the parameters through the virtual impedance adjustment module, which can reduce or even eliminate the parameter asymmetry and realize the balanced control of the winding phase current. At the same time, a Simulink model is built to verify the effectiveness of the control algorithm. Finally, the hardware drive platform and software control algorithm based on YXSpace 2000 semi-physical simulator are built for experimental verification.","PeriodicalId":185921,"journal":{"name":"2023 IEEE 6th International Electrical and Energy Conference (CIEEC)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121778148","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}
{"title":"Research on Joint Control Strategy of Multi-terminal VSC-HVDC Wind Power System with STATCOM","authors":"Ruiqi Zou, Z. Li, Z. Cai, Shuai Wang, Hao Li","doi":"10.1109/CIEEC58067.2023.10167188","DOIUrl":"https://doi.org/10.1109/CIEEC58067.2023.10167188","url":null,"abstract":"With the growing maturity of wind power generation technology and policy support, the grid connection of large-scale wind farms has also been gradually paid attention to. In order to ensure high-precision point of common coupling (PCC) voltage control, high power factor and improve system operation stability, wind speed feedforward control and reactive power limiting link are introduced to limit wind speed and voltage fluctuations, and constant voltage control strategy is improved, Combined with constant power factor control, a joint control strategy is proposed to predict the required active power output of the fan, and then determine the dominant factors affecting voltage fluctuation at this time to select different control strategies. STATCOM devices are put into operation to compensate the voltage of the system to further improve the stability of the system. Based on MATLAB/Simulink platform, the compensation effect of joint strategy and STATCOM in different short circuit fault types of multi-terminal wind power system is verified. The simulation results show that the joint control strategy can simultaneously maintain the stability of PCC point voltage and ensure higher power factor of the unit. STATCOM compensation effect is significant, and can effectively improve power quality.","PeriodicalId":185921,"journal":{"name":"2023 IEEE 6th International Electrical and Energy Conference (CIEEC)","volume":"237 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115828609","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}
Wei Wu, Liangliang Han, Zhiqing Yang, Shuang Zhao, Helong Li, L. Ding, Jian Tang, Bo Zhao
{"title":"Comprehensive Loss and Thermal Analysis for Three-phase NPC Grid-tied Converters","authors":"Wei Wu, Liangliang Han, Zhiqing Yang, Shuang Zhao, Helong Li, L. Ding, Jian Tang, Bo Zhao","doi":"10.1109/CIEEC58067.2023.10165869","DOIUrl":"https://doi.org/10.1109/CIEEC58067.2023.10165869","url":null,"abstract":"Loss and junction temperature are key parameters for the safe operation of power semiconductor devices in power electronic systems. However, it is difficult to forecast the exact thermal stress of the device in field use. Consequently, engineers tend to use higher rated devices to maintain excessive margin, resulting in a higher cost. In this article, the loss and thermal characteristics of a three-phase neutral point clamped (NPC) converter are investigated under different operating conditions. Firstly, the loss and thermal characteristics of a three-phase converter under different modulation methods are explored, as well as the effect of positive and negative power factors on the losses. Secondly, along with the needs of the grid, the converter's loss characteristics for producing inductive and capacitive reactive power are taken into account. Finally, the loss changes during low-voltage ride-through (LVRT) are evaluated. These evaluations contribute in the rationalization of semiconductors selection and design during the early stages of converter design.","PeriodicalId":185921,"journal":{"name":"2023 IEEE 6th International Electrical and Energy Conference (CIEEC)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115950821","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}