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FPGA-based Adaptive Variable Step MPPT Real Time Simulation for Photovoltaic Systems

IOP Conference Series: Earth and Environmental Science 2021年第1期645卷

作者： Ruxun He Shouxiang Wang Chunyu Zhang Qi Ma Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin 300072 China Tianjin Key Laboratory of Power System Simulation and Control Tianjin University Tianjin 300072 China State Grid Tianjin Electric Power Company Tianjin 300010 China

In order to obtain more output power, maximum power point tracking (MPPT) control technology is usually designed to track the maximum power of photovoltaic (PV) array. The traditional power disturbance observation method tends to cause power oscillation loss, so an adaptive variable step algorithm is presented to balance the tracking accuracy and speed of PV system. Different from off-line simulation, the overall model is built on FPGA to complete the real time digital realization of MPPT control for PV system. Finally, the model is simulated and verified by ModelSim software. The experimental results show that the system can track the maximum power more quickly and accurately in real time.

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Vertically integrated outdoor in-site line protection based on SoC technique

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Global Energy Interconnection 2018年第2期1卷 179-186页

作者： Tonghua Wu Yuping Zheng Yutao Qiu Xiaoping Zhang Gang Yao Jimin Chai Xiaofan Hou College of Energy and Electrical Engineering Hehai University NARI Group Corporation/State Grid Electric Power Research Institute State Key Laboratory of Smart Grid Protection and Control State Grid Zhejiang Electric Power Corporation Electrical and System Engineering University of Birmingham

By focusing on the problems of speed, reliability, operation and maintenance in the practical application of line protection in conventional and smart substations, we propose system architecture and a technical scheme for in-site(similar in meaning to on-site or near-process) line protection based on vertical integration and outdoor installation. The functions of the single-bay merging unit, relay protection, and intelligent terminal are vertically integrated to reduce the number and types of devices, simplify the configuration, reduce signal transmission, and shorten the protection action time. In addition, this vertically integrated device is applied to provide data acquisition and control execution support for substation-area protection, security and stability of devices, and other substation-area devices. The vital performance outputs are tested and compared. Finally, the experimental results verify that the proposed scheme is feasible and the technology is advanced.

关键词： Line protection In-site relay protection Merging unit Vertical integration

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Optimal multi-time scale coordination method for electricity-heating integrated energy system scheduling

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IOP Conference Series: Earth and Environmental Science 2021年第1期645卷

作者： Zhuoran Lin Shouxiang Wang Shaomin Wang Aoyang Han Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin 300072 China Tianjin Key Laboratory of Power System Simulation and Control Tianjin University Tianjin 300072 China State Grid Qingdao Electric Supply Company Qingdao Shandong 266000 China

Considering that different energy subsystems have different control characteristics in equipment operations, an optimal multi-time scale coordination method for electricity-heating integrated system scheduling is proposed. It merges three optimal scheduling models based on three-time scales of day-ahead, rolling, and real-time. The coordinated optimization of electricity and heating energies with the same dispatch instruction is fulfilled in day-ahead scheduling. And all feasible scheduling instruction cycles are traversed in the rolling stage to improve the stability of system economic operation. The calculation examples show that the proposed overall strategy for multi-time scale scheduling can achieve multi-energy complementarity, and the optimization results have less deviation from the actual load.

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LCC-HVDC supplementary controller design based on global fast terminal sliding mode control 2

LCC-HVDC supplementary controller design based on global fas...

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2nd IEEE International Conference on Energy Internet, ICEI 2018

作者： Liu, Qipu Sun, Guoqiang Nong, Weizhi Lin, Zijie Tang, Xiaochen Yang, Jia College of Energy and Electrical Engineering Hohai University Nanjing China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation Nanjing China

ISBN: (纸本)9781538641316

Conventional LCC-HVDC is a non-linear, tightly coupled system. Since the performance of PI control varies from different operation conditions, the optimal of parameter tuning is only achieved under steady state. To improve dynamic performance and stability of system, A novel HVDC nonlinear supplementary controller based on Terminal sliding mode theorem has been proposed. First, the steady state mathematical model of the LCC-HVDC system is built, the approach of state feedback exact linearization is adopted to change the nonlinear model into a linear one, the decoupled relationship between the control variables are investigated;then based on sliding mode control method, the constant current and constant voltage control in rectifier and inverter has been achieved, respectively. The variables converge to equilibrium point fast and exactly. Finally, the strategy is demonstrated through Matlab/Simulink software, the simulation results show that the controller is capable of tracing the reference, and the robustness with respect to parameters' perturbations is satisfied. The controller contributes significantly toward improving transient performance comparing to conventional PI control and restraining commutation failure. © 2018 IEEE.

关键词： controllers

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Effect of long-term fluorination on surface electrical performance of ethylene propylene rubber

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High Voltage 2019年第4期4卷 339-344页

作者： Rujia Men Zhipeng Lei Tao Han Davide Fabiani Chuanyang Li Simone Vincenzo Suraci Jian Wang Shanxi Key Laboratory of Mining Electrical Equipment and Intelligent Control College of Electrical and Power EngineeringTaiyuan University of TechnologyTaiyuan 030024People's Republic of China Department of Electrical Electronicand Information Engineering‘Guglielmo Marconi’University of BolognaViale Risorgimento 2Bologna 40136Italy Key Laboratory of Smart Grid of Education Ministry School of Electrical and Information Engineering Tianjin UniversityTianjin 300072People's Republic of China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityChangping DistrictBeijing 102206People's Republic of China

To investigate the effect of fluorination on surface electrical performance of ethylene propylene rubber(EPR),four pieces of EPR specimens are prepared and fluorinated for different duration ranging from 120 min to 480 *** surface morphology and element compositions of experimental specimens are *** surface potential decay and complex permittivity are *** tracking discharge property and the erosion properties after tracking test are *** surface charge transport and electrical property tailoring mechanism are *** results show that when the fluorination duration is from 120 min to 360 min,the surface morphology gradually becomes flat and compact with time,and the surface resistance to electrical tracking is *** an excessive fluorination with the duration of 480 min leads to a significant increase in surface conductivity and a weakening in the resistance to electrical tracking,which is mainly due to a change in surface *** recommended fluorination duration for an optimised surface property is between 240 and 360 min for EPR specimen.

关键词： electrical propylene rubber

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Reliability analysis of security and stability control system with typical structure in power grids

Reliability analysis of security and stability control syste...

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IEEE General Meeting Power& Energy Society

作者： Xijian Dong Chanan Singh Heping Jia Bijun Li State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation Nanjing China Texas A&M University College Station USA State Grid Economic and Technological Research Institute Co. LTD. Beijing China

The security and stability control system (SSCS) is the second line of defense for prevention of security breach and control of power systems in China. With the development of smart grid technologies, it has been becoming more complex with an increasing trend of reliability requirements. In this paper, a typical application of SSCS in the power grid and its optimized design for ensuring its correct action are introduced. The Markov process model is developed to evaluate the availability of the proposed SSCS. The concept and algorithm of integrity for the SSCS are proposed with the consideration of equipment availability and functional reliability. Combined with the conclusion of the integrity calculation, useful suggestions for the design of SSCS are provided.

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混合多端直流输电系统保护方法研究

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Engineering 2021年第8期7卷 65-88页

作者：郑玉平何佳伟李斌吴通华戴魏李晔 State Key Laboratory of Smart Grid Protection and Control State Grid Electric Power Research Institute (NARI Group Corporation) College of Energy and Electrical Engineering Hohai University Key Laboratory of Smart Grid of Ministry of Education Tianjin University

近年来，混合多端直流输电系统快速发展。但是，在混合直流系统中应用的电压源换流器（voltage-source converter, VSC）出口不再需要直流滤波器。此外，考虑到其直流故障电流可被换流器自身有效抑制，直流线路两端也不再需要安装限流... 详细信息

近年来，混合多端直流输电系统快速发展。但是，在混合直流系统中应用的电压源换流器（voltage-source converter, VSC）出口不再需要直流滤波器。此外，考虑到其直流故障电流可被换流器自身有效抑制，直流线路两端也不再需要安装限流电抗器。这意味着线路两端边界缺失，导致应用于常规高压直流输电（line commutated converter based high-voltage direct current, LCC-HVDC）系统和柔性直流（VSC-HVDC）电网的单端量保护均无法适用于混合多端直流输电系统。为此，本文提出了一种适用于混合多端直流输电系统的单端量保护新原理，该方法主要基于暂态信息和主动注入思想实现故障辨识。与应用于LCCHVDC和VSC-HVDC系统的单端量保护相比，所提方法无需依赖线路两端的边界元件，因此更加适用于混合多端直流系统。大量的仿真算例充分验证了所提方法的可行性和优越性。

关键词：混合多端直流输电系统单端量保护暂态量信息主动注入

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PWM rectifier impedance modelling and analysis

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IOP Conference Series: Earth and Environmental Science 2021年第1期675卷

作者： Yiyuan Bie Yang Li Guoqing He Xing Zhang State Key Laboratory of Electrical Insulation and Power Equipment Shaanxi Key Laboratory of Smart Grid School of Electrical Engineering Xi'an Jiaotong University Xi'an Shaanxi Province 710049 State Key Laboratory of Control and Operation of Renewable Energy and Storage Systems China Electric Power Research Institute (CEPRI) Beijing China

PWM rectifiers are widely used in the field of new energy power generation. The study of small signal impedance modeling of PWM rectifier is helpful to analyze the stability of new energy grid connected impedance. In this paper, the small-signal impedance model of the PWM rectifier is first established, and then the impedance model of the PWM rectifier is scanned through MATLAB using the impedance sweep method, and compared with the analytical expressions in this paper, the accuracy of the impedance model of PWM rectifier established in this paper is verified.

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A Chip Data Security Transmission Method based on Command control Word Mode 2

A Chip Data Security Transmission Method based on Command Co...

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2nd IEEE International Conference on Information Systems and Computer Aided Education, ICISCAE 2019

作者： Jia, Liu Fu, Qingqin Ang, Zhengquan Zhang, Qian Yi, Ling Feng, Tingzheng Bai, Xuesong Shi, Yuejie Beijing Smart Chip Microelectronics Technology Company Limited Beijing Electric Power High Reliability Integrated Circuit Design Engineering Research Center Beijing China Beijing Aerospace Flight Control Center Beijing China Beijing Smart Chip Microelectronics Technology Company Limited State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing China

ISBN: (纸本)9781728130668

Aiming at the shortcomings of traditional security chip data transmission, a method of security chip data transmission based on command control word is proposed. The method divides the read command mode and write command mode of the security chip files into two kinds of representation methods. The read command and write command of the security chip files are transmitted by different data transmission methods. In the control word of read and write command mode of security chip files, the read and write commands of security chip files are transmitted in four ways: plaintext, ciphertext, plaintext + MAC and ciphertext + MAC. The properties of prohibit adding and updating are added to the writing command control word of security chip files. In the control word of read command and write command of security chip files, define the permissions that read command and write command operation need to satisfy. © 2019 IEEE.

关键词： Data communication systems

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The operation analysis of the CCHP driven by Gas-steam combined cycle

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IOP Conference Series: Earth and Environmental Science 2020年第5期558卷

作者： Junyu Liang Xingyu Yuan Jiangqi Gu Yunnan Electric Power Research Institute CSG China NARI Group Co. Ltd The State Key Laboratory of Smart Grid Protection and Operation Control

In combined cooling heating and power system, the gas-steam combined cycle is gradually used more and more. The common operation mode in CCHP is mainly to determine heat by electricity and heat by electricity. This paper defines an index indicator and analyzes the difference between the two operating modes in different intervals through the system energy supply interval chart, finally analyzes the difference in the indicators between the two operating modes through the actual load method. It is concluded that in winter operating conditions, the following the thermal load (FTL) operation mode is better; in summer operating conditions, the indicator of following the electric load (FEL) is better; during the transition season, the value of PEC is better in the case of following the thermal load.

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