2020 4th International Conference on HVDC (HVDC)最新文献_第10页

Hybrid DC Transmission System Based on LCC-FBMMC 基于LCC-FBMMC的混合直流传输系统

2020 4th International Conference on HVDC (HVDC) Pub Date : 2020-11-06 DOI: 10.1109/HVDC50696.2020.9292854

Guowei Liu, R. Tian, Xuezhi Wu, Jing Wang, L. Jing, Yuming Zhao

{"title":"Hybrid DC Transmission System Based on LCC-FBMMC","authors":"Guowei Liu, R. Tian, Xuezhi Wu, Jing Wang, L. Jing, Yuming Zhao","doi":"10.1109/HVDC50696.2020.9292854","DOIUrl":"https://doi.org/10.1109/HVDC50696.2020.9292854","url":null,"abstract":"Hybrid DC transmission systems are mostly used in offshore wind power systems or oil platforms, which have good development prospects in large-scale power transmission, renewable energy grid connection and grid interconnection. Existing systems based on Line Commutated Converter (LCC) and Half-Bridge Modular Multilevel Converter (HBMMC) cannot achieve bidirectional power transmission or meet the situation where short-term power reversal transmission is required for power supports. These kinds of systems do not have the capability of clearing the short circuit fault on the DC side either. Take this situation into account, this paper proposes a multi-terminal hybrid DC transmission system using LCC on the rectifier side and Full-Bridge Modular Multilevel Converter (FBMMC) on the inverter side. By changing the polarity of the voltage on the DC side of the FBMMC, power reversal is achieved. Then the paper analyzes the operating principle and control strategies of LCC and FBMMC. The Simulink model was built to verify the system's ability to reverse the power flow. Finally, the simulation results show that, compared with the existing hybrid DC transmission system, the system proposed in this paper can meet the need of power reversal and has the capability of fault ride-through on the DC side.","PeriodicalId":298807,"journal":{"name":"2020 4th International Conference on HVDC (HVDC)","volume":"7 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":"125710829","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

Prestressed Method to Improve the Pressure Distribution Uniformity within Press Pack IGBTs 改善压包式igbt内部压力分布均匀性的预应力方法

2020 4th International Conference on HVDC (HVDC) Pub Date : 2020-11-06 DOI: 10.1109/HVDC50696.2020.9292756

Xizi Zhang, C. Sai, Li Li, Yiming Zhang

引用次数: 1

Derivation and Comparison for Modular Multilevel Converter Topologies with Hybrid Structures 混合结构模块化多电平变换器拓扑的推导与比较

2020 4th International Conference on HVDC (HVDC) Pub Date : 2020-11-06 DOI: 10.1109/HVDC50696.2020.9292699

Shiyuan Fan, Heya Yang, Xin Xiang, Wuhua Li, Huan Yang, Xiangning He, R. Zhao

引用次数: 1

Subsequent Commutation Failure Prediction of HVDC by Integrating Physical-driven and Model-driven Methods 物理驱动与模型驱动相结合的HVDC后续换相失效预测

2020 4th International Conference on HVDC (HVDC) Pub Date : 2020-11-06 DOI: 10.1109/HVDC50696.2020.9292766

Chengchen Huang, Wanchun Qi, Quanquan Wang, Rui Gu, Chenyi Zheng, Yi Tang

{"title":"Subsequent Commutation Failure Prediction of HVDC by Integrating Physical-driven and Model-driven Methods","authors":"Chengchen Huang, Wanchun Qi, Quanquan Wang, Rui Gu, Chenyi Zheng, Yi Tang","doi":"10.1109/HVDC50696.2020.9292766","DOIUrl":"https://doi.org/10.1109/HVDC50696.2020.9292766","url":null,"abstract":"Commutation failure (CF) is one of the most common faults in traditional HVDC system. Effective prediction of CF is beneficial to the safety and stability of the power system. The physical-driven prediction method can effectively reflect the causal law but it is difficult to establish a precise model. Data-driven prediction method has the advantage of efficient training, but the prediction accuracy depends on a large number of high-quality training samples. Combining the advantage of physical-driven and data-driven methods, a CF prediction method is proposed. In the physical-driven part, the inherent response of the power system is transformed from time-domain to frequency-domain to obtain the predicted commutation voltage. Then the predicted DC current can be obtained based on the superposition theorem. Finally, the predicted extinction angle can be calculated according to the commutation mechanism. In the part of data-driven, the amplitude and phase of each harmonic of the commutation voltage are taken as the input characteristics, and the extinction angle predicted by the physi-cal-driven method can be modified. According to the results of the test system built in electromagnetic transient simulation software, the validation of the proposed method is verified.","PeriodicalId":298807,"journal":{"name":"2020 4th International Conference on HVDC (HVDC)","volume":"3 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":"128907722","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: 4

Research on Control Strategy of Virtual Synchronous Generator Based on Self-Adaptive Inertia and Damping 基于自适应惯性和阻尼的虚拟同步发电机控制策略研究

2020 4th International Conference on HVDC (HVDC) Pub Date : 2020-11-06 DOI: 10.1109/HVDC50696.2020.9292824

Xuyang Wan, Feng Zheng, Yongmei Gan, Fan Zhang

引用次数: 1

Research and Simulation of Hybrid AC/DC Microgrid 交直流混合微电网的研究与仿真

2020 4th International Conference on HVDC (HVDC) Pub Date : 2020-11-06 DOI: 10.1109/HVDC50696.2020.9292793

F. Gao, Xiaohui Wang, Peihao Yang, S. Kou, Mengyao Sun

引用次数: 9

Analysis on the Arm Power Imbalance in Modular Multilevel Matrix Converter with Frequency Ratio near One-third 频率比接近1 / 3的模块化多电平矩阵变换器臂功率不平衡分析

2020 4th International Conference on HVDC (HVDC) Pub Date : 2020-11-06 DOI: 10.1109/HVDC50696.2020.9292731

Shenquan Liu, Boyang Zhao, Xifan Wang

{"title":"Analysis on the Arm Power Imbalance in Modular Multilevel Matrix Converter with Frequency Ratio near One-third","authors":"Shenquan Liu, Boyang Zhao, Xifan Wang","doi":"10.1109/HVDC50696.2020.9292731","DOIUrl":"https://doi.org/10.1109/HVDC50696.2020.9292731","url":null,"abstract":"Fractional frequency transmission system (FFTS) is a promising integration method for long-distance offshore wind farms. The modular multilevel matrix converter serves as the frequency converter between the 50/3 Hz FFTS and the 50 Hz main grid; however, constant circulating current component for inter-arm energy balancing is observed when the M3C operates with frequency ratio near one-third. This paper investigates the origin and compensation method for this arm power imbalance. The 3rd-order harmonics in M3C is modelled utilizing the two-dimensional phasor method proposed by the authors in previous research. Subsequent analysis shows that the arm power imbalance is generated by coupling between 3rd-order harmonic neutral-point voltage and the system-side fundamental-frequency arm current component. Then, compensation method is proposed to eliminate the 3rd-order harmonic neutral-point voltage, which resultantly retains the arm power balance and suppresses the constant circulating current. At last, the proposed model and compensation strategy is verified by simulation studies carried out in MATLAB/Simulink environment.","PeriodicalId":298807,"journal":{"name":"2020 4th International Conference on HVDC (HVDC)","volume":"4 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":"124228509","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

Centralized Control Strategy Considering Decentralized Energy Storage participate in Optimal Power System Dispatching 考虑分散储能参与电力系统最优调度的集中控制策略

2020 4th International Conference on HVDC (HVDC) Pub Date : 2020-11-06 DOI: 10.1109/HVDC50696.2020.9292728

Juan Li, Hung-Yi Yu, Jianyu Hu, S. Fang, Ye Zhou, Liqiang Pan

{"title":"Centralized Control Strategy Considering Decentralized Energy Storage participate in Optimal Power System Dispatching","authors":"Juan Li, Hung-Yi Yu, Jianyu Hu, S. Fang, Ye Zhou, Liqiang Pan","doi":"10.1109/HVDC50696.2020.9292728","DOIUrl":"https://doi.org/10.1109/HVDC50696.2020.9292728","url":null,"abstract":"In order to effectively solve the problem of wind and solar energy curtailment or load shedding caused by the insufficient regulation capacity of traditional power sources in renewable energy high-penetration power systems, a generalized source-storage system is proposed. It centralizes the scattered renewable energy and then shifts it to peak load period, so that the power output can follow the load changes of the power grid. Thus, the purpose of using renewable energy installed capacity to properly supplement the power shortage needs is achieved. Firstly, according to the operating status of traditional power systems, a schedulable range constraint that takes into account the marginal amount of net load indicators is proposed. Then, in order to reduce the prediction errors caused by wind power fluctuations, a mathematical model of the energy storage system and a centralized control strategy are established. Finally, an optimal scheduling model for wind and fire storage systems with energy storage systems is established, and a hybrid particle swarm algorithm combining standard particle swarm and simulated annealing algorithms are used to solve the problem. The results of calculation examples show that the power system model considering the constraints of the schedulable range effectively reduces the feasible range of the variables and improves the speed of solving the model. In addition, the centralized control strategy that considers distributed energy storage to participate in the optimal dispatch. Compared with the traditional strategy, while improving the accuracy of the control, the solution results are further in line with the actual situation, which provides a theoretical basis for the optimal dispatching of the actual complex power system.","PeriodicalId":298807,"journal":{"name":"2020 4th International Conference on HVDC (HVDC)","volume":"22 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":"123123092","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

Research on Main Circuit Analysis of VSC-HVDC under Over-modulation Method 过调方法下VSC-HVDC主电路分析研究

2020 4th International Conference on HVDC (HVDC) Pub Date : 2020-11-06 DOI: 10.1109/HVDC50696.2020.9292676

N. Zhang, Yuebin Zhou, Liu Yang, Shukai Xu, Zhe Zhu, Yan Xiong

{"title":"Research on Main Circuit Analysis of VSC-HVDC under Over-modulation Method","authors":"N. Zhang, Yuebin Zhou, Liu Yang, Shukai Xu, Zhe Zhu, Yan Xiong","doi":"10.1109/HVDC50696.2020.9292676","DOIUrl":"https://doi.org/10.1109/HVDC50696.2020.9292676","url":null,"abstract":"Over-modulation can increase the voltage RMS of the component with fundamental frequency produced by the voltage sourced converter based high voltage direct current (VSC-HVDC). It has economic and technical advantages since it can reduce the current flowing through the VSC valve, the power losses of VSC valve and the requirement of sub-module capacitance. However, the present theory cannot describe the characteristic electric quantity of modular multilevel converter under natural over-modulation condition precisely. Taking the MMC based on full-bridge sub-module for example and taking advantage of generating negative voltage by full-bridge submodule, the analytical method of MMC with using natural over-modulation is studied. By introducing the AC- and DC-modulation ratio, the mathematical models of voltage ripple, current ripple and circulating current of MMC are derived. Meanwhile, impact on the requirement of the total number of sub-modules caused by natural over-modulation is analyzed. Comparison of the simulations by PSCAD/EMTDC and calculation results shows that the derived mathematical model is capable of describing voltage ripple, current ripple and circulating current of MMC accurately and has value on MMC theory and industrial application.","PeriodicalId":298807,"journal":{"name":"2020 4th International Conference on HVDC (HVDC)","volume":"84 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":"117151115","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 Subsynchronous Oscillation of Photovoltaic and Battery Storage Systems Integrated to Weak Grid 弱电网光伏与蓄电池系统的次同步振荡研究

2020 4th International Conference on HVDC (HVDC) Pub Date : 2020-11-06 DOI: 10.1109/HVDC50696.2020.9292686

Ming Yi, Yunhui Huang, Dang Zhu

引用次数: 0