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Highway Charging Station Plan Based on Dynamic Traffic Flow Simulation

IOP Conference Series: Earth and Environmental Science 2018年第3期170卷

作者： Jing Zhang Hao Zhou Shaohua Liu Chang Liu Shuang Zeng Linru Jiang Bin Li Hong Liu Beijing Electric Vehicle Charging Engineering &Technology Research Center China Electric Power Research Institute Co Ltd Beijing China Smart Grid Education Key Laboratory (Tianjin University) Tianjin China Anhui Electric Power Saving Service Co Ltd State Grid Corporation of China Hefei China Beijing Electric Power Company State Grid Corporation of China Beijing China

The reasonable arrangement of the charging station, the infrastructure used to charge the electric vehicle, is vital for the promotion of electric vehicles. As for highways, a highway charging station planning method based on the dynamic traffic flow simulation is proposed in this paper. First, the running and charging demands of electric vehicles on the highways are analyzed; second, considering the interests of investors and vehicle owners, a mathematical model is constructed to specify the objective function; thirdly, the dynamic traffic flow simulation method suitable for the highway condition is proposed; finally, a method is provided, the validity and practicability of this method are verified with examples, and its effects on the photovoltaic consumption are analyzed further in this paper as for the planning result.

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A secure communication framework based on chaotic system array and its application in Internet of Energy

A secure communication framework based on chaotic system arr...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Jinlong Li Jinzhong Li Shuqi Zhang Ke Wang Haiyang Zhang Lun Yang Xia Zhao High Voltage Department China Electric Power Research Institute Beijing China Henan Xinyang Company State Grid Corporation of China Xinyang China State Key Laboratory of Power Transmission Equipment & System Security and New technology Chongqing Unversity Chongqing China

ISBN: (纸本)9781538614280

Information communication technology(ICT) is the key issue of internet of energy(IoE). It's important and necessary to improve the information security statue. As chaotic signal is noise-like, unpredictable and sensitive to the variation of initial conditions and structure parameters, using chaotic system to build secure communication system is feasible and reliable. In this paper, a framework of secure communication system that is constructed with chaotic system array is proposed and analyzed. Different types of chaotic systems with unique structure parameters were used to form an array which generating chaotic signals for secure communicating. Chaotic signals in the array are partial or complete used to modulate/mask the message needed transmission. The encryption algorithm may be jointed while processing the message before emitting it, which can promote the secure communication system secure statue comparing to the conventional cryptosystems. The simulation verification of the secure communication system with plain-image show it works on a high performance. Moreover, this cryptosystem can be achieved with chips, DSP, FPGA, micro-computers and programming language. The application of secure communication system within chaotic system array in IoE is worth a further research.

关键词： Chaotic communication Encryption Arrays Synchronization Communication systems Array signal processing

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PLL effect on subsynchronous torsional interaction with VSC-HVDC

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The Journal of Engineering 2017年第13期2017卷 2119-2124页

作者： Rong Hu Jianhang Zhu Hongtao Liu Huafeng Zhou Jiale Chen Electric Power Dispatching Control Center of China Southern Power Grid Co. Ltd Guangzhou Guangdong 510623 People's Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 People's Republic of China

Subsynchronous torsion interaction (SSTI) between synchronous generator (SG) and high-voltage direct current (HVDC) is one of the main issues for the safe and stable operation of power systems. Compared with SSTI between SGs and line-commutated-converter (LCC)-HVDC, which has been well studied in the past, SSTI between SG and voltage source converter (VSC)-HVDC can also occur. Currently, the studies of SSTI between SG and VSC-HVDC mainly focus on the dynamics of alternating current controller of VSC-HVDC, and it is sufficient to study the electrical damping when evaluating the risk for SSTI. However, the influence of phase-locked loop (PLL) and line impedance between SG and VSC-HVDC is ignored. Here, the effect of PLL dynamics on SG electrical damping is focused. As considering the difference of rotational frame between SG and VSC-HVDC in the current loop timescale, which is caused by the line impedance X g , the mathematical model of dynamic effect of PLL on the electrical damping of SG is derived. Moreover, the optimised design of PLL in considering line impedance conditions is proposed, and it can reduce or eliminate the negative electrical damping in subsynchronous frequency region of SG to reduce the risk of SSTI between SG and VSC-HVDC. Finally, the validity of the analysis and proposed optimisation principle is verified by simulation results.

关键词： HVDC power transmission synchronous generators electric current control phase locked loops voltage-source convertors SG electrical damping VSC-HVDC line impedance SSTI subsynchronous torsional interaction PLL effect synchronous generator high-voltage direct current line-commutated-converter voltage source converter alternating current controller phase-locked loop current loop timescale subsynchronous frequency region

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Saturation Load Forecasting Based on Long Short-Time Memory Network

Saturation Load Forecasting Based on Long Short-Time Memory ...

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IEEE Conference on Energy Internet and Energy System Integration

作者： Hu Li Xuejiao Mao Lei Zhu Yingbei Yao Jian Tan Economic and Technology Research Institute State Grid Jiangsu Electric Power Limited Company Nanjing China Key Laboratory of Control of Power Transmission and Transformation of Ministry of Education Shanghai Jiao Tong University Shanghai China East China Electric Collection Industrial Co. Ltd. Shanghai China

The number of factors affecting the level of electricity consumption are gradually increasing. To analyze the influence of these factors on the saturation load, a multiinput saturation load forecasting model based on long shortterm memory network is proposed in this paper. The model can deal with the uncertainty and time correlation of saturation load forecasting. Historical load information is saved in the long-term memory cell in the model, and the load information is updated according to the short-term factor input. Firstly, this paper takes six factors as the input of the model, and Adam optimization method is selected to do model training. Next, combined with the saturation load criterion, the optimized model is used to forecast the future annual maximum load and electricity consumption, and then the final saturation time and scale can be decided. Finally, an example shows that compared with the traditional prediction model, the model in this paper can do prediction with higher accuracy.

关键词： Saturation load criterion Long short-term memory network power system planning Saturation load Saturation electricity consumption

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Analysis and Research on Low-Cost and Non-Intrusive power Metering Chip

Analysis and Research on Low-Cost and Non-Intrusive Power Me...

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The 9th Asia-Pacific power and Energy Engineering Conference (APPEEC 2017)

作者： Li-Ping Gao Xiu-Li Yu Liang Huang Tao-Rong Gong State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing Engineering Research Center of High-Reliability IC with Power Industrial Grade Beijing Smart-Chip Microelectronics Technology Co. Ltd.

Metering technology is one of the core technologies of the smart power *** overall metering solution and related products have a wide market space in the whole process of power production, which bring new opportunities for power distribution development from automation to intelligentialize, and provide technical supports for the power metering system platform. Because of the importance of metering products and their market demand, this paper focuses on the design of a simple power metering chip with low-cost, lowprecision and non-invasive, so as to lay the foundation for the development and practical technology accumulation of power metering products. The design achieves low cost by reducing the acquisition accuracy, simplifying the collection and sampling methods. This paper studies the chip accuracy,sampling methods, collection methods, and the inference of the chip characteristics requirements.

关键词： power Metering Chip Low-Cost Low-Precision Sampling Methods

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Design of Rated power Control Strategy of Wind Turbine Based on Particle Swarm Optimization

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IOP Conference Series: Earth and Environmental Science 2018年第1期192卷

作者： YC Yang Y Liu P Song Y Cui Y Bai Department of Control and Computer Engineering North China Electric Power University Beijing 102206 China North China Electric Power Research Institute Co. Ltd. Smart Grid and New Energy Institute Beijing 100045 China Grid-connected Operation Technology for Wind-Solar-Storage Hybrid System State Grid Corporation Key Laboratory

In view of the reduction of wind turbine operating efficiency caused by wind speed measurement errors, this paper proposes a rated power control strategy for wind turbines for practical applications; in order to solve the problem that the pitch PI controller parameters of wind turbines are not easy to calculate and tune in the process of design and optimization, this paper proposes a complete set of methods for parameter tuning of pitch control PI controllers for wind turbines. This paper establishes a Bladed-Matlab co-simulation platform, uses Bladed software to build a complete model of a 2MW wind turbine, and designs a rated power control strategy for wind turbines. After the wind turbine model is linearized at different wind speed points by applying Bladed software, the linearized model for PI parameter tuning is obtained, and then the optimal PI parameters for each wind speed point are set by using particle swarm algorithm. According to the variation law between the PI parameters and the pitch angle obtained before, the PI parameters are adjusted adaptively by variable gain PI control. The simulation results show the superiority of the control strategy and parameter tuning method used in this paper.

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Research on optimization of valve hall grounding switches configuration in ±1100KV UHVDC converter station 12

Research on optimization of valve hall grounding switches co...

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12th IET International Conference on AC and DC power transmission, ACDC 2016

作者： Sima, Wenxia Han, Xue Yang, Ming Li, Licheng Wang, Rong State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing400044 China Electric Power Research Institude China Southern Power Grid Company Ltd Guangzhou510080 China State Grid Chengdu Power Supply Company State Grid Sichuan Electric Power Company Chengdu Sichuan610041 China

ISBN: (纸本)9781785612268

According to the design scheme of the Zhundong-Wannan ±1100kV power transmission project built this year, there are 24 grounding switches (GS) configured in the valve hall to ensure safety when maintenance. A huge investment is required due to the expensive GS and their huge volume causing a huge valve hall area. Therefore, it is necessary to optimize the grounding switches configuration (GSC) to decrease the valve hall building area and reduce the investment. In this paper, a high accurate model for GSC is established with the parameters from the design. Based on the model, valve hall residual energy distribution and release characteristics under different GSC after converter station block are investigated. The influence factors on the residual energy release characteristics are also studied. Then an optimum GSC is selected considering its comprehensive investment and its performance of discharging residual energy. The optimum GSC is Y1D1 strategy, in which two GS are installed on any phase of Y/Y and Y/D side of the converter transformer respectively.

关键词： Investments

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Study on the glaze ice accretion of wind turbine with various chord lengths

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IOP Conference Series: Earth and Environmental Science 2018年第4期121卷

作者： Jian Liang Maolian Liu Ruiqi Wang Yuhang Wang Shandong Luneng Intelligence Technology Co. LTD Jinan China State Key Laboratory of Power Transmission Equipment & System Security and New Technology (Chongqing University) Chongqing China Chongqing Branch of China Unicom Chongqing China State Grid Shandong Electric Power Research Institute Jinan China

Wind turbine icing often occurs in winter, which changes the aerodynamic characteristics of the blades and reduces the work efficiency of the wind turbine. In this paper, the glaze ice model is established for horizontal-axis wind turbine in 3-D. The model contains the grid generation, two-phase simulation, heat and mass transfer. Results show that smaller wind turbine suffers from more serious icing problem, which reflects on a larger ice thickness. Both the collision efficiency and heat transfer coefficient increase under smaller size condition.

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The study on CT saturation caused by the circulating current in the delta-winding of converter transformer and its impact on the protection in HVDC system 12

The study on CT saturation caused by the circulating current...

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12th IET International Conference on AC and DC power transmission, ACDC 2016

作者： Zhang, Kanjun Qi, Xuanwei Yin, Xianggen Chen, Kun Hu, Wei Zhang, Shiyun State Grid Hubei Electric Power Research Institute Wuhan430077 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9781785612268

In the typical HVDC power system, the current transformers (CTs) between the Y-delta converter transformer and the converter bridge is located in the delta-winding of the transformer. Under such condition, the measuring current of these CTs includes the zero-sequence circulating current of the deltawinding. In the case of the adjacent transformer energization or the fault of AC system, the zero-sequence circulating current in the delta-winding maybe very large containing a great amount of dc component. Thus the CTs will be saturated, resulting in the misoperation of the relevant protection in HVDC system, such as the bridge current differential protection. This sort of misoperation seriously threatens the safe and sound operation of the HVDC power system. In this paper, the misoperation cause is analysed in detail via the PSCAD/EMTDC-based simulation. Based on this, a method is proposed to prevent this sort of misoperation by utilizing the zero-sequence circulating current as the restraint quantity.

关键词： Electric instrument transformers

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The study on sympathetic inrush current of converter transformers in HVDC system and its identification method 12

The study on sympathetic inrush current of converter transfo...

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12th IET International Conference on AC and DC power transmission, ACDC 2016

作者： Zhang, Kanjun Qi, Xuanwei Zhang, Shiyun Cao, Wenbin Yang, Fan Yin, Xianggen State Grid Hubei Electric Power Research Institute Wuhan430077 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9781785612268

This paper analyses the mechanism of the sympathetic inrush current of the converter transformer of the HVDC transmission system. The impacting factors of the sympathetic inrush current, including the system impedance, the closing angle and the initial remnant flux of the incoming transformer, and the operating condition of the HVDC system and so on, are analysed utilizing on the PSCAD/EMTDC soft. Based on this, this paper proposed two identification methods for the sympathetic inrush current and the simulation proofs the validity of these methods.

关键词： HVDC power transmission

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