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2020 IEEE International Conference on power, intelligent Computing and Systems, ICPICS 2020

作者： Tang, Jie Song, Huanhuan Xu, Aidong Jiang, Yixing Wen, Hong Zhang, Yunan Qin, Kaiyu Chengdu611731 China Electric Power Research Institute China Southern Power Grid Co. Ltd. Guangzhou China Aircraft Swarm Intelligent Sensing and Cooperative Control Key Laboratory of Sichuan Province Uestc Chengdu611731 China

ISBN: (纸本)9781728198736

Internet of Things (IoT) enables information sharing among massive small and cheap wireless devices. However, the secret key sharing process in massive IoT applications becomes more challenging due to the low latency communication requirements and resource constrained IoT devices. To adress those probelms, we propose a physical layer secret key sharing scheme for MIMO (multiple-input-multiple-output) IoT applications, which can realize secret key sharing with communication simultaneously. This is because the information of secret key is attached in the combination of the activated/non-activated parallel sub-channels of the legitimate receiver, which is created by SVD (singular value decomposition) of the MIMO channel of the legitimate receiver. Consequently, the legitimate receiver can accurately obtain the shared key and demodulate the communication data with an arbitrary low key BER and BER (bit error rate). The simulation results verified the validity and security of the proposed scheme. © 2020 IEEE.

关键词： Internet of things

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Study on control Sequence Coordination Method Between Security and Stability control System and HVDC Pole control System

Study on Control Sequence Coordination Method Between Securi...

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Sustainable power and Energy Conference (iSPEC)

作者： Mingshun Liu Yihua Zhu Qinfeng Ma Chengxiang Li Rui Chen Jingpei Zhang Mingkang Wu Power Dispatching Control Center of Guizhou Power Grid Co. Ltd CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid

ISBN: (数字)9781728191645

ISBN: (纸本)9781728191652

Security and stability control system (SSC) is an important guarantee for the safe operation of power grid, and for HVDC system modulation function is an important kind of stability control measures. Combined with Tianshengqiao-Guangzhou HVDC safety strategy transformation, RTDS simulation test is conducted. In allusion to the exposed defects about SSC handling with multiple DC power modulation orders and sequence coordination between SSC and pole control system, the handling way for the stability control device of Mawo converter station and control characteristics of DC power modulation for pole control system are analyzed in detail. An optimization method of control sequence coordination for stability control system and pole control system is proposed, and tested on the SSC test platform. Test results show the effectiveness of the proposed method, and meanwhile the significance for the design and implementation of SSC scheme of HVDC project with similar techniques.

关键词： HVDC transmission Modulation power system stability control systems Stability analysis Timing Security

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An Improved Chimp Optimization Algorithm for Short-term Hydrothermal Scheduling

IAENG International Journal of Computer Science

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IAENG International Journal of Computer Science 2022年第3期49卷 666页

作者： Chen, Gonggui Wang, Shumin He, Yongsheng Shang, Wanfeng Long, Hongyu Key Laboratory of Industrial Internet of Things and Networked Control Ministry of Education Chongqing University of Posts and Telecommunications Chongqing400065 China Chongqing University of Posts and Telecommunications Chongqing400065 China State Grid Chongqing Electric Power Company Chongqing400015 China Guangdong Provincial Key Lab of Robotics and Intelligent System Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen Shenzhen518055 China Chongqing Key Laboratory of Complex Systems and Bionic Control Chongqing University of Posts and Telecommunications Chongqing400065 China

The short-term hydrothermal scheduling (STHS) is a complex non-linear, non-convex and high-dimensional mathematical optimization problem. Due to the fact that the original chimp optimization algorithm (ChOA) is likely to fall into local optimum and has the disadvantage of low population diversity, an improved chimp optimization algorithm (IChOA) is proposed to solve the STHS problem. Firstly, Logistic-Tent chaotic mapping is employed to initialize the population and increase the population diversity. Then a new nonlinear convergence factor is introduced to make the optimization search process more applicable to STHS problems. Next, particle swarm algorithm (PSO) and gravitational search algorithm (GSA) are combined to enhance the shortcoming and balance the global search ability and local exploration ability of ChOA. Moreover, Cauchy mutation and opposition-based learning strategy are supplemented as perturbation interference when the optimal position is not updated to improve the ability to leap out of the local optimum. Finally, a graded optimization strategy is adopted for the constraint handing of dynamic reservoir balance and thermal power balance. Three standard hydrothermal power systems are utilized to verify the practicability and validity of the proposed method. Results of simulations reveal that IChOA has significant competitive advantages in addressing the STHS problem. © 2022, IAENG International Journal of Computer Science. All Rights Reserved.

关键词： Particle swarm optimization (PSO)

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Dynamic Reconfiguration of Distribution Network Based on Temporal Constrained Hierarchical Clustering and Fireworks Algorithm

Dynamic Reconfiguration of Distribution Network Based on Tem...

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2020 IEEE/IAS Industrial and Commercial power System Asia, I and CPS Asia 2020

作者： Zhang, Yumin Ji, Xingquan Xu, Jiabin Yin, Ziyang Han, Xueshan Zhang, Chao Shandong University of Science and Technology College of Electrical Engineering and Automation Qingdao China Dongying Power Supply Company State Grid Dongying China Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan China

ISBN: (纸本)9781728143033

For the dynamic reconfiguration problem of distribution networks, the handling of switching cost constraint and the division of time period are the two key aspects that affect the performance of the reconfiguration algorithm. In this paper, an improved temporal constrained hierarchical clustering algorithm for dynamic reconfiguration of distribution networks is proposed. Firstly, the improved hierarchical clustering approach considering the temporal constraint is used to divide the operating status of the distribution network into multiple time intervals according to the similarity of loads and the output power of distributed generations (DGs). The dynamic reconfiguration of distribution networks is then transformed into multiple single-stage static reconfiguration problems, and the cluster center is used to approximately represent the load state and DG output state of the period. In order to reduce the number of infeasible solutions and poor solutions, a coding method based on heuristic rules to reduce the solution space of distribution network reconfiguration is proposed. An improved fireworks algorithm based on heuristic rules is proposed to solve the reconfiguration problem. Finally, a modified IEEE-33 test system is used to verify the validity of the proposed method. © 2020 IEEE.

关键词： Clustering algorithms

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Tight Formulations of Unit Commitment with General Start-Up Ramp Rate Constraints

Tight Formulations of Unit Commitment with General Start-Up ...

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Sustainable power and Energy Conference (iSPEC)

作者： Yijie Gao Xuan Zhang Yaowen Yu Key Laboratory of Image Processing and Intelligent Control School of Artificial Intelligence and Automation Huazhong University of Science and Technology Wuhan China Hitachi ABB Power Grid San Jose California US

ISBN: (纸本)9781665414401

Unit commitment (UC) is a central market clearing process in wholesale electricity markets. With the increasing size and complexity of market-clearing models, UC problems become more and more complicated. To improve the computation efficiency, this paper tightens UC formulations with the general start-up ramp rate. Through analyzing their parameters over three periods, units are categorized into several categories for constructing corresponding tight formulations, and three of the categories are beyond existing works. By applying a recent systematic formulation tightening approach on top of these categories, new tight constraints of the general start-up ramp rate have been obtained. Numeral testing results illustrate the tightening process and demonstrate the improvement of computational efficiency when using our tightened formulations.

关键词： Systematics Computational modeling Conferences Electricity supply industry Computational efficiency Complexity theory Testing

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Field experiment using transient energy method to locate a single-phase to ground fault

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Global Energy Interconnection 2020年第6期3卷 585-594页

作者： Wei Xie Xuewen Wang Chen Fang Hengxu Zhang Fang Shi Xiaodong Xing Baicong Sun State Grid Shanghai Municipal Electric Power Company No.1122 Yuanshen RoadShanghai Scan for more details 200122P.R.China State Grid Chongqing Electric Power Research Institute No.80 Huangshan RoadChongqing 401123P.R.China Key Laboratory of Power System Intelligent Dispatch and Control(Ministry of Education) Shandong UniversityNo.17923 Jingshi RoadJinan 250061P.R.China State Grid Shanghai Electric Power Research Institute No.171 Handan RoadShanghai 200233P.R.China

Distribution networks in China and several other countries are predominantly neutral inefficiently grounding systems(NIGSs),and more than 80%of the faults in distribution networks are single-phase-to-ground(SPG)*** of the weak fault current and imperfect monitoring equipment configurations,methods used to determine the faulty line secti ons with SPG faults in NIGSs are in *** developme nt and application of distributi on-level phasor measurement units(PMUs)provide further comprehensive fault information for fault diagnosis in a distribution *** an SPG fault occurs,the transient energy of the faulted line section tends to be higher than the sum of the transient energies of other line *** this regard,transient energy-based fault location algorithms appear to be a promising *** this study,a field test plan was designed and implemented for a 10 kV distribution *** test results dem on strate the effective ness of the transient en ergy-based SPG locati on method in practical distributi on networks.

关键词： Sin gle-phase-to-gro und fault Fault location Neutral in efficiently groundi ng systems Distributi on n etwork Distribution-level PMU Transient energy.

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Research on Real-time Simulation of Wide Area Out-of-step System in CSG

Research on Real-time Simulation of Wide Area Out-of-step Sy...

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

作者： Lifan Mao Dongxu Chang Ruicai Liu Yihua Zhu Hengdao Guo MingKang Wu Power Dispatching and Control Center Hainan Power Grid Co.Ltd Haikou China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (数字)9781728196060

ISBN: (纸本)9781728196077

In order to study the action characteristics of wide area out-of-step system in CSG, the real-time simulation study based on RTDS is carried out. In this paper, a test system based on the actual devices and the settings are constructed, and the modeling methods of the important measurement such as the power angle of tie line, Ucos φ oscillation curve and the voltage at the installation point of device are studied. The operation characteristics of wide area out-of-step system are fully verified by several serious single or multiple fault cases. The analysis of the simulation results shows that the wide area out-of-step system can meet the design requirements of splitting speediness, simultaneity and selectivity, and can solve the problems of late splitting in the south channel of Guangdong and Guangxi section, as well as the problem that the system cannot recover stability after splitting Guangdong and Guangxi, Guizhou and Guangxi section simultaneously.

关键词： Voltage measurement Stability criteria power system stability Real-time systems Data models Transient analysis Oscillators

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Research on Transforming Effect and Calculation Method of MMC Converter on AC / DC Harmonics

Research on Transforming Effect and Calculation Method of MM...

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Sustainable power and Energy Conference (iSPEC)

作者： Liu Cui Guangqiang Peng Jingsong He Jiyang Wu Chizu Mao Ning Jiao State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid GuangZhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System GuangZhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid GuangZhou China Maintenance & Test Center EHV Power Transmission Company Guangzhou CSGKEY LABORATORY FOR DC TRANSMISSIONEQUIPMENT STATE EVALUATION AND FAULT DIAGNOSIS GuangZhou China College of Electrical Engineering and Information Technology Sichuan University Chengdu China

ISBN: (纸本)9781665414401

Modular multilevel converter (MMC) is currently the most concerned voltage source converter topology in the field of flexible direct current transmission (VSC-HVDC). Due to its non-linear characteristics, harmonic components will inevitably be generated in AC and DC systems, which may affect the operation of equipment and system, cause protection equipment to malfunction, and cause interference to neighboring communications. The MMC converter is a non-linear device, which can be considered as an amplifying modulator with voltage and current conversion functions. The AC and DC networks are coupled to each other through the MMC converter to generate dynamic harmonic interaction. In recent years, harmonic instability problems have appeared in many VSC-HVDC projects. Compared with other converter topologies, the transfer relationship of harmonics on the AC and DC sides of MMC converters has not been studied in depth. In this paper, by studying the AC/DC harmonic conversion characteristics of MMC converters, it reveals the conversion law of MMC converters between AC/DC harmonics; through theoretical derivation, the quantitative calculation method of MMC harmonic transmission process is given. PSCAD simulation results prove the correctness of the above results.

关键词： Network topology Simulation Bridge circuits Voltage power system harmonics Harmonic analysis Frequency conversion

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Corrigendum to “Single-ended DC line protection scheme based on first peak time of current-limiting reactor voltage” [Int. J. Electr. power Energy Syst. 150 (2023) 109100]

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International Journal of Electrical power & Energy Systems 2023年 152卷

作者： Xiuyan Wei Guibin Zou Chaochao Chen Shuo Zhang Chenghan Zhou Shenglan Song The Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Ji’nan 250061 China State Grid Weifang Power Supply Company Weifang 261061 China

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Analysis of Commutation Failure in LCC-HVDC Systems During Unbalanced Conditions Using Sequence Components

Analysis of Commutation Failure in LCC-HVDC Systems During U...

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International Conference on power System Technology (powerCON)

作者： Ahmed Omer Xiaohui Wang Zhenjian Xie Chen Li Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education School of Electrical Engineering Shandong University Jinan China State Grid Jiangsu Electric Power Co. Ltd. Economic and Technological Research Institute Nanjing China

ISBN: (纸本)9781665407380

This paper takes close research on the impact of unbalanced faults in the occurrence of Commutation Failure (CF) in LCC-HVDC inverters, by finding the probability of CF with the phase shift that takes place in case of unbalanced faults. The analyses of the unbalanced system are conducted by using sequence components, a relationship between the phase shift and unbalance ratio is implemented to describe the degree of unbalance in the system. The unbalance ratio is used to quantify the amount of the phase shift that will cause CF in the system, and the probability of CF with respect to unbalance ratio is obtained. Moreover, a mathematical model is implemented to calculate the critical amount of unbalance degree that will cause CF in the system, with different faults applied, the relationship between commutation failure and phase shift is obtained. The mathematical model is verified using PSCAD/EMTDC.

关键词： Fault diagnosis Mathematical models Inverters power systems

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