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2020 4th International Conference on HVDC (HVDC)最新文献

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Effect of Submarine Cable Capacitance on Dynamic Aggregation Modeling of SCIG-Based Wind Farm 海底电缆电容对基于scig的风电场动态聚集建模的影响
2020 4th International Conference on HVDC (HVDC) Pub Date : 2020-11-06 DOI: 10.1109/HVDC50696.2020.9292842
Yao Qin, Xiaohe Wang, Han Wang, X. Cai, Bin Lin, Han Xu
{"title":"Effect of Submarine Cable Capacitance on Dynamic Aggregation Modeling of SCIG-Based Wind Farm","authors":"Yao Qin, Xiaohe Wang, Han Wang, X. Cai, Bin Lin, Han Xu","doi":"10.1109/HVDC50696.2020.9292842","DOIUrl":"https://doi.org/10.1109/HVDC50696.2020.9292842","url":null,"abstract":"The offshore wind farm is close to the load center, and its development scale is getting larger and larger. In order to study the dynamic characteristics of wind farms, it is obviously impractical to take detailed wind farm model as research object. In this paper, on the principle of keeping the external characteristics of the wind farm unchanged, an aggregation study of the wind farm taking into account the submarine cable capacitance effect is given. In addition, the aggregation method of the internal parameters of the wind turbine generators (WTGs) and the collector system are given. Finally, a detailed wind farm model with 34 squirrel-cage induction generator (SCIG) WTGs and the corresponding aggregated model are established on PSCAD simulation software. The dynamic characteristics of the two models at the point of common coupling (PCC) under grid fault condition are simulated and compared. The results show that the proposed dynamic aggregation method can present the dynamic characteristics of wind farm with high accuracy, and can be popularized for other types of wind farm.","PeriodicalId":298807,"journal":{"name":"2020 4th International Conference on HVDC (HVDC)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129415924","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: 2
A pilot protection for HVDC transmission line based on polarity characteristics of control signal deviation 基于控制信号偏离极性特性的直流输电线路导频保护
2020 4th International Conference on HVDC (HVDC) Pub Date : 2020-11-06 DOI: 10.1109/HVDC50696.2020.9292761
Ruidong Xu, G. Song, Yuxuan Zhang, Junjie Hou
{"title":"A pilot protection for HVDC transmission line based on polarity characteristics of control signal deviation","authors":"Ruidong Xu, G. Song, Yuxuan Zhang, Junjie Hou","doi":"10.1109/HVDC50696.2020.9292761","DOIUrl":"https://doi.org/10.1109/HVDC50696.2020.9292761","url":null,"abstract":"In order to solve the problem that the long-time delay of traditional differential protection which has reduced the reliability of high voltage direct current line backup protection, consider the control strategies and response characteristics of the converter controller, a pilot protection for HVDC transmission line based on polarity characteristics of control signal deviation is proposed. By analyzing the fault characteristics of the converter control signal during the fault, drawn the conclusion that when the DC system occurs fault, from the converter dynamic regulation stage to the fault steady-state, the deviation of rectifier constant current control signal and the deviation of inverter constant current control signal will meet the positive polarity and the deviation of inverter constant extinction angle control signal will meet the negative polarity, but these polarity characteristics are not satisfied when the AC system occurs fault, therefore, the protection criterion is constructed. The simulation results show that the proposed backup protection principle has strong anti-transition-resistance ability and high reliability. Compared with the traditional differential protection, the proposed principle can reliably identify the internal fault from the converter dynamic regulation stage to the fault steady stage, which improves the reliability of the traditional HVDC line backup protection.","PeriodicalId":298807,"journal":{"name":"2020 4th International Conference on HVDC (HVDC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129854532","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: 1
Analysis of the Dead-Times Effects in Parallel SVPWM Three-Level T-Type PV Converters 并联SVPWM三电平t型光伏变流器死区时间效应分析
2020 4th International Conference on HVDC (HVDC) Pub Date : 2020-11-06 DOI: 10.1109/HVDC50696.2020.9292673
Yang Li, Xu Yang, Tao Liu, Decai Ming, Xingtao Dai, Yigao Liu
{"title":"Analysis of the Dead-Times Effects in Parallel SVPWM Three-Level T-Type PV Converters","authors":"Yang Li, Xu Yang, Tao Liu, Decai Ming, Xingtao Dai, Yigao Liu","doi":"10.1109/HVDC50696.2020.9292673","DOIUrl":"https://doi.org/10.1109/HVDC50696.2020.9292673","url":null,"abstract":"This paper addresses analysis of the dead-times effects in parallel SVPWM three-level T-type converters. Since the zero-sequence circulating currents (ZSCCs) generation is sensitive to the averaged zero-sequence voltage differences, the dead-time effects, which are known to cause load-dependent distortion to inverter output voltages as well as the averaged zero-sequence voltages, may cause significant ZSCCs between the parallel-connected units. In this paper, the detail analysis of ZSCC generated by SVPWM based on a derived average model taking into account dead-time effects is proposed to obtain better ZSCC suppression performance in the future. To verify the validity of the developed model, the circuit simulation results are shown and compared with the analytical results.","PeriodicalId":298807,"journal":{"name":"2020 4th International Conference on HVDC (HVDC)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132371913","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: 1
A Isolated Bidirectional DC/DC Converter with Low-Voltage IGBTs for Solid-State Transformers 固态变压器用低压igbt隔离型双向DC/DC变换器
2020 4th International Conference on HVDC (HVDC) Pub Date : 2020-11-06 DOI: 10.1109/HVDC50696.2020.9292754
Xiaodong Zhao, Binbin Li, Q. Fu, Yuejie Zhang, Shaukai Mao, Dianguo Xu
{"title":"A Isolated Bidirectional DC/DC Converter with Low-Voltage IGBTs for Solid-State Transformers","authors":"Xiaodong Zhao, Binbin Li, Q. Fu, Yuejie Zhang, Shaukai Mao, Dianguo Xu","doi":"10.1109/HVDC50696.2020.9292754","DOIUrl":"https://doi.org/10.1109/HVDC50696.2020.9292754","url":null,"abstract":"In order to reduce footprint and improve efficiency, solid-state transformer (SST) is an attractive technology for traction and smart grid applications. As the key components of SST, the conventional isolated bidirectional DC/DC converter (IBDC) is hard to guarantee high efficiency and high power density at the same time, due to the limitations of switching characteristics of semiconductor devices and high insulation requirements of medium frequency transformer (MFT). In this paper, a new IBDC topology is proposed, which is characterized by utilizing low-voltage IGBTs with excellent switching characteristics to build high voltage configuration. This helps to reduce the number of the MFTs. Meanwhile, the zero-current switching (ZCS) conditions for all the IGBTs can be guaranteed. This significantly reduce switching losses. The operation principles of the proposed IBDC are analyzed, and the feasibility is verified by simulation results.","PeriodicalId":298807,"journal":{"name":"2020 4th International Conference on HVDC (HVDC)","volume":"12 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130504997","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: 1
Rapid Power Compensation-based PV Generation System Damping Electromechanical Oscillation 基于快速功率补偿的光伏发电系统阻尼机电振荡
2020 4th International Conference on HVDC (HVDC) Pub Date : 2020-11-06 DOI: 10.1109/HVDC50696.2020.9292775
Xinyuan Liu, Zhengran Tang, Jie Hao, Mingxian Li, Yi Zhang, Hua Chai
{"title":"Rapid Power Compensation-based PV Generation System Damping Electromechanical Oscillation","authors":"Xinyuan Liu, Zhengran Tang, Jie Hao, Mingxian Li, Yi Zhang, Hua Chai","doi":"10.1109/HVDC50696.2020.9292775","DOIUrl":"https://doi.org/10.1109/HVDC50696.2020.9292775","url":null,"abstract":"By modulating the active power output of the grid-tied inverter, the photovoltaic (PV) generation system can effectively damp the electromechanical oscillation of the power grid. To analyze the influence of different PD controller gains on its output power for the typical droop and inertia control strategies, this paper takes the conventional application scenarios of PV damping electromechanical oscillation as the research example. Studies show that when the PD controller gain is amplified to the limit condition, the PV generation system will operate in the rapid power compensation (RPC) mode: based on the speed deviation polarity, the active power modulation limit (Pmppt or 0) will be used as the basis for alternate output to damp the system imbalanced power. The comparison of speed indicators shows that the RPC mode is significantly stronger than the conventional droop and inertia control for grid electromechanical oscillation damping. In view of this, this paper proposes a novel grid electromechanical oscillation damping strategy based on RPC mode, and sets the switching thresholds and corresponding active current commands for 4 operating conditions to quickly and effectively suppress the generator rotor speed oscillation phenomenon. The simulation results show that the proposed control strategy in this paper does not require a complicated control parameter tuning process, and can significantly suppress the system electromechanical oscillation, which is beneficial to ensure the power system stable operation.","PeriodicalId":298807,"journal":{"name":"2020 4th International Conference on HVDC (HVDC)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116140068","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: 1
Two-stage Photovoltaic Power Supply Modeling and Simulation Based on Double Closed-loop Control 基于双闭环控制的两级光伏电源建模与仿真
2020 4th International Conference on HVDC (HVDC) Pub Date : 2020-11-06 DOI: 10.1109/HVDC50696.2020.9292829
Xuekai Hu, Liang Meng, Qian Zhang, Tiecheng Li, Xiaoming Li, Hao Yi
{"title":"Two-stage Photovoltaic Power Supply Modeling and Simulation Based on Double Closed-loop Control","authors":"Xuekai Hu, Liang Meng, Qian Zhang, Tiecheng Li, Xiaoming Li, Hao Yi","doi":"10.1109/HVDC50696.2020.9292829","DOIUrl":"https://doi.org/10.1109/HVDC50696.2020.9292829","url":null,"abstract":"In order to study the operating characteristics of distributed power supply, a photovoltaic power supply model that satisfies grid-connected standards needs to be built first. In this paper, for the two-stage photovoltaic power supply, we first set up the mathematical model of the inverter in the abc coordinate system based on its topological structure. In order to solve the problem that the variables are all of the power frequency AC, the dq rotation coordinate system is transformed; in order to realize the decoupling control, the feedforward compensation is introduced. Then, the mathematical model of the inverter in the complex frequency domain is obtained through Laplace transformation, and then a two-stage photovoltaic power supply model based on double closed-loop control is established. Finally, the RTDS real-time digital simulation platform is used to simulate and analyze the important indicators under normal operation and fault conditions. The results prove that the two-stage photovoltaic power supply model mentioned in this paper satisfies the grid-connected photovoltaic power supply standards and can be applied to the analysis and application of engineering projects.","PeriodicalId":298807,"journal":{"name":"2020 4th International Conference on HVDC (HVDC)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121852267","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
An Effective DPWM Realization Method to Suppress the CM Resonance for MLCL-Filtered Grid-Connected PV Inverters 一种抑制mlcl滤波并网光伏逆变器CM谐振的有效DPWM实现方法
2020 4th International Conference on HVDC (HVDC) Pub Date : 2020-11-06 DOI: 10.1109/HVDC50696.2020.9292852
Hongwei Zhou, Xu Yang, Jiansong Zhang
{"title":"An Effective DPWM Realization Method to Suppress the CM Resonance for MLCL-Filtered Grid-Connected PV Inverters","authors":"Hongwei Zhou, Xu Yang, Jiansong Zhang","doi":"10.1109/HVDC50696.2020.9292852","DOIUrl":"https://doi.org/10.1109/HVDC50696.2020.9292852","url":null,"abstract":"The modified LCL (MLCL) filter is widely used in the transformerless PV string inverter to suppress the common mode (CM) harmonic current flowing into the power grid. Whereas, the CM current resonance may arise in the inverter side current due to the MLCL filter. The CM harmonic in the inverter side current is related not only to the control strategy but also to the modulation method. In this paper, we compare the CM harmonic suppression ability of two discontinuous pulse width modulation (DPWM) realization methods, the negative carrier flipped (NCF) method and the negative carrier shifted (NCS) method. Since the NCF method has a smaller CM voltage compared with NCS method in the zero-clamped region, we conclude that the CM harmonics with NCF method should be much smaller than those with NCS. Finally, the theoretical analysis is verified by the experiment.","PeriodicalId":298807,"journal":{"name":"2020 4th International Conference on HVDC (HVDC)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122610075","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
Analysis of Harmonic Instability Induced by Lightning Strike in a LCC-HVDC System LCC-HVDC系统雷击诱发谐波失稳分析
2020 4th International Conference on HVDC (HVDC) Pub Date : 2020-11-06 DOI: 10.1109/HVDC50696.2020.9292782
Qi Guo, Chao Luo, Xuehua Lin, L. Deng, Shuyong Li, Mengjun Liao
{"title":"Analysis of Harmonic Instability Induced by Lightning Strike in a LCC-HVDC System","authors":"Qi Guo, Chao Luo, Xuehua Lin, L. Deng, Shuyong Li, Mengjun Liao","doi":"10.1109/HVDC50696.2020.9292782","DOIUrl":"https://doi.org/10.1109/HVDC50696.2020.9292782","url":null,"abstract":"In a ±500 kV/3000 MW line commutated converter based high voltage dc (LCC-HVDC) transmission system, divergent 125Hz harmonic voltage oscillation resulted in bipolar block after de line lightning strike fault. To study the phenomenon and find a solution, the characteristics of harmonic oscillation are first analyzed, and the harmonic transfer model of AC and DC system is established. Then HVDC control and protection cubicles in the loop simulation platform based on real time digital simulator (RTDS) is established and the harmonic instability phenomenon in field is reproduced. Further, the influence factors of oscillation damping are studied, based on the closed-loop simulation platform. Finally, the solution is proposed via control optimization and is verified on the simulation platform.","PeriodicalId":298807,"journal":{"name":"2020 4th International Conference on HVDC (HVDC)","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131473363","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: 2
Impedance Modeling of Series-Connected Modular Multilevel Converter Considering Third Harmonic Suppression 考虑三次谐波抑制的串联模块化多电平变换器阻抗建模
2020 4th International Conference on HVDC (HVDC) Pub Date : 2020-11-06 DOI: 10.1109/HVDC50696.2020.9292708
W. Gong, Jiexiong Xu, Can Wang
{"title":"Impedance Modeling of Series-Connected Modular Multilevel Converter Considering Third Harmonic Suppression","authors":"W. Gong, Jiexiong Xu, Can Wang","doi":"10.1109/HVDC50696.2020.9292708","DOIUrl":"https://doi.org/10.1109/HVDC50696.2020.9292708","url":null,"abstract":"The major harmonic component of the secondary side current of the series-connected modular multilevel converter (SC-MMC) is the third harmonic. The existence of the third harmonic current will impair the accuracy of impedance modeling at AC side of SC-MMC. In this paper, firstly, the small signal impedance model at AC side of SC-MMC is derived by using the method of multi-harmonic linearization without considering the influence of the third harmonic current. Results indicate that the accuracy of impedance modeling is affected by the third harmonic current. Secondly, in order to suppress the bad effects caused by the third harmonic current, a proportional-resonant (PR) controller is applied. The small signal AC impedance model of SC-MMC taking account of the aforementioned PR controller is established. Finally, the accuracy of the impedance model considering third harmonic suppression is verified by simulation results.","PeriodicalId":298807,"journal":{"name":"2020 4th International Conference on HVDC (HVDC)","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133232346","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: 1
Analysis of the DC-Link Voltage Ripple for the Three Phase Voltage Ripple Under Low Order Harmonic Output Current 低次谐波输出电流下直流链路三相电压纹波分析
2020 4th International Conference on HVDC (HVDC) Pub Date : 2020-11-06 DOI: 10.1109/HVDC50696.2020.9292800
Lei Yang, Tao Wang, Shan Li, Kuan Fu Liang
{"title":"Analysis of the DC-Link Voltage Ripple for the Three Phase Voltage Ripple Under Low Order Harmonic Output Current","authors":"Lei Yang, Tao Wang, Shan Li, Kuan Fu Liang","doi":"10.1109/HVDC50696.2020.9292800","DOIUrl":"https://doi.org/10.1109/HVDC50696.2020.9292800","url":null,"abstract":"This paper presents a general analytical method of the dc-link voltage ripple to facilitate the dc-link capacitor design for the three phase voltage source converters (VSCs) under harmonic ac currents. The expressions of the dc-link low order harmonic (LOH) voltages and switching harmonic voltages (SRVs) are derived, respectively. Moreover, a simple and practical equation for designing the dc-link capacitor, based on the maximum value of the dc-link voltage ripple, has been proposed. A flexible grid-tied inverter lab prototype is developed to inject arbitrary combinations of LOH currents of different orders, sequences, amplitudes and angles into the grid. Good match between the computational and experimental results validates the proposed methods.","PeriodicalId":298807,"journal":{"name":"2020 4th International Conference on HVDC (HVDC)","volume":"257 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133250697","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: 1
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