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Power and Electrical Engineering (ACPEE), 5th Asia Conference on

作者： Zun Ma Xian Meng Chao Xing Binjiang Hu Yihua Zhu Liang Tu System Analysis and DC Technology Research Institute Electric Power Research Institute of Yunnan Power Grid Co. Ltd Kunming China Power system simulation and control technology department State Key Laboratory of HVDC EPRI CSG Guangzhou China Power system simulation and control technology department National Energy Power Grid Technology R&D Centre Guangzhou China Power system simulation and control technology department CSG Key Laboratory for Power System Simulation Guangzhou China

ISBN: (数字)9798350309638

ISBN: (纸本)9798350309645

An MPPT control strategy based on the combination of adaptive nonlinear mutation particle swarm optimization algorithm is proposed. The algorithm uses the tanh function to control the inertia weight, balances the ability of particles to optimize globally and locally, uses the ISrU function to control the learning factor, balances the weight relationship between individual learning and social learning, and improves the convergence speed of the algorithm. The nonlinear Cauchy mutation operation is proposed to expand the scope of optimization; Finally, the perturbation and observation method is used to track locally near the maximum power point to reduce power oscillation. The simulation validates that the photovoltaic MPPT control strategy based on the improved particle swarm algorithm can effectively get the maximum power point under shading conditions and improve the output efficiency of the PV array.

关键词： Maximum power point trackers Photovoltaic systems Electrical engineering Perturbation methods Asia Particle swarm optimization Oscillators

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Cyber-Attack risk Assessment and Prevention Strategy of Substations Based on dynamic Attack and defense Game 3

Cyber-Attack Risk Assessment and Prevention Strategy of Subs...

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3rd Power system and Green Energy Conference, PSGEC 2023

作者： Lin, Feng Mei, Yong Zhu, Yihua Chang, dongxu Liu, ren Guo, Hengdao China Southern Power Grid Power Dispatch and Control Center GuangZhou China Electric Power Research Institute China Southern Power Grid State Key Laboratory of Hvdc GuangZhou China Electric Power Research Institute China Southern Power Grid National Energy Power Grid Technology R&d Centre GuangZhou China China Southern Power Grid Csg Key Laboratory for Power System Simulation GuangZhou China Guangdong Provincial Key Laboratory of Intelligent Operation Control for New Energy Power System GuangZhou China

ISBN: (纸本)9798350340099

With the improvement of the informatization of the power system, the risk of cyber attack is also increasing. This paper proposes a risk assessment and prevention strategy for cyber attack against substations. Firstly, the cyber attack against substations are modeled based on the game theory of dynamic attack and defense. Secondly, an improved OPA (OrNL-PSErC-Alaska) model is utilized to analyze the cascade failure after cyber attacks and quantify the load loss of power system. Finally, a preventive strategy which can mitigate the expectation load loss caused by cyber attack against substations is put forward. Simulation experiments were conducted to validate the effectiveness of the proposed method. © 2023 IEEE.

关键词： risk assessment

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Practical research on On-Line Monitoring and control Function Module of relay Protection in Smart Substation 18

Practical Research on On-Line Monitoring and Control Functio...

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18th International Conference on AC and dC Power Transmission, ACdC 2022

作者： Huang, Zhida Wu, Wencong Cai, Haiqing Huang, Libin State Key Laboratory of HVDC Electric Power Research Institute CSG Guangzhou510663 China National Energy Power Grid Technology R&D Centre Guangzhou510663 China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou510663 China CSG Key Laboratory for Power System Simulation Guangzhou510663 China

ISBN: (数字)9781839537615

ISBN: (纸本)9781839537615

At present, the power grid is carrying out the practical work of smart substation On-line monitoring and control function module of relay protection. Compared with traditional substations, the new-generation assurance system has been greatly improved in 7 functional modules, including fault archiving, special maintenance information patrol, fixed value checking, configuration checking, substation testing, intelligent alarm, and master station modeling. It can fully adapt to the functional requirements of smart substations and traditional substations. This paper analyzes the monitoring and analysis requirements of the assurance system based on the equipment configuration of the station control layer of the new generation of intelligent substations, and proposes a complete design scheme of seven functional modules from three aspects: functional requirements, implementation logic, and performance design. The practical application results in the power grid simulation laboratory show that the On-line monitoring and control function module of relay protection based on the guarantee system can be compatible with the traditional 103 substations and 61850 substations and achieve the expected goals and performance requirements. It has the value of promotion and application. © ACdC 2022. All rights reserved.

关键词： relay protection

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Conflict Mechanism Analysis Method for Electric Vehicles Participating in Multiple Types of Power Grid Ancillary Services

Conflict Mechanism Analysis Method for Electric Vehicles Par...

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2023 International Conference on Power system Technology, PowerCon 2023

作者： Xue, Yinjuan Chen, Qifang Cai, Haiqing Xia, Mingchao Gu, Haohan School of Electrical Engineering Beijing Jiaotong University Beijing China State Key Laboratory of Hvdc Electric Power Research Institute China Southern Power Grid National Energy Power Grid Technology R&d Centre 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: (纸本)9798350300222

As the high-quality flexible resource of the grid, electric vehicles (EVs) can provide multiple auxiliary services for the grid at the same time. However, due to the one-way charging and discharging of EVs, as well as the limitation of power and capacity, which may cause availability conflicts when EVs participate in different auxiliary services simultaneously. This paper focuses on the analysis of the conflict mechanism of EVs participating in the secondary frequency regulation and peak shaving ancillary services at the same time. The impact mechanism between different auxiliary services in this conflict mode is revealed from the two aspects of limit conflict and charging and discharging instruction conflict, and the results of availability conflict of the two types of auxiliary services are verified and analyzed through simulation examples. © 2023 IEEE.

关键词： Frequency modulation

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Study on the excitation inrush suppression strategy of phase-selective switching converter with closing resis-tor switch considering dispersion 10

Study on the excitation inrush suppression strategy of phase...

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10th China International Conference on Electricity distribution, CICEd 2022

作者： Liu, Zhijiang Lin, Xuehua Huang, Libin Li, ShuYong State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid. Guangzhou China National Energy Power Grid Technology R&D Centre Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China

ISBN: (数字)9781665452687

ISBN: (纸本)9781665452687

A detailed analysis of the excitation inrush current bias phenomenon in the event is carried out in the context of a certain time when charging of a converter is carried out in an ultra-high voltage dC project of the Southern China Power Grid to obtain the cause of the event, which is confirmed by rTdS tests. By analysing the relationship between the moment of closing of different auxiliary contacts and the intermittent angle of the excitation inrush current, the shortest input time at which the closing resistance can play a role in weakening the excitation inrush current is proposed at different moments of closing. Finally, considering the discrete nature of circuit breaker closing, the proposed closing resistor best access time and the best closing angle, the effectiveness of the proposed strategy is verified by simulation tests. © 2022 IEEE.

关键词： Electric circuit breakers

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Comparison and optimization of an air cooling design for lithium-ion battery packs by using an electrochemical-thermal coupled model 3

Comparison and optimization of an air cooling design for lit...

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3rd New Energy and Energy Storage system control Summit Forum, NEESSC 2023

作者： Zhou, Zhuomin Liang, Jian Yu, Aiqin Qin, Zhengbin Sheng, Yanchao Liu, Haotian Guo, Wei Development Planning Department State Grid Hunan Electric Power Company Limited Changsha China Institute of Economic Research State Grid Xiangtan Electric Power Company Limited Changsha China Institute of Economic Research State Grid Hunan Electric Power Company Limited Changsha China R&D Department Three Gorges Intelligent Industrial Control Technology Co. Ltd Wuhan China

ISBN: (纸本)9798350309348

Compared with other ways of heat dissipation, the capability of the air cooling heavily depends on the geometric forms of the cells’ cases, the arrangements of the cells and the boundary conditions, since the air flow is more arbitrary than other phases. A comprehensive study of the relationship between the cooling effect of the air and the factors lacks fairly until now. An electrochemical-thermal coupled model is proposed to design an air cooling system for lithium-ion cells packs in this study. The temperature, pressure and air velocity distributions are simulated, and the thermal and fluid kinetic behaviors in cells or packs are optimized by using the model. different schemes of geometric forms, air’s velocity and arrangements of cells are compared and analyzed in the process of the heat dissipation. results show that the uniformity of cell temperature throughout the pack was significantly affected by the geometry of cooling ducts. The capability of the heat dissipation in the battery packs is gradually improved when the inlet velocity increases, conversely, if the velocity exceeds 8 m s-1, the heat dissipation capability is not significantly improved. The heat dissipation capability is better in the staggered arrangement of the cells than in aligned arrangement, and the parallel arrangement of batteries is better than the series-wound arrangement. ©2023 IEEE.

关键词： Ions

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The HEFT Algorithm Based on Node Merging

The HEFT Algorithm Based on Node Merging

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control Engineering and Advanced Algorithms (IWCEAA), International Workshop on

作者： Ying Huang Yuanhong Lu Jie Zhang Jingyue Zhang Haiping Guo National Energy Power Grid Technology R&D Centre Guangzhou 510663 State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou 510663 Guangzhou China National Energy Power Grid Technology R&D Centre Guangzhou 510663 Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou 510663 Guangzhou China National Energy Power Grid Technology R&D Centre Guangzhou 510663 CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou 510663 Guangzhou China

ISBN: (数字)9798331528881

ISBN: (纸本)9798331528898

The task scheduling problem in power systems is complex, especially when communication costs exceed computation costs. This paper proposes an improved HEFT algorithm with a node merging mechanism, merging nodes through hierarchical traversal to assign high-communication-cost tasks to the same processor, reducing communication overhead. Experiments with 499-dimensional and 1614-dimensional matrices from the power system show that the improved algorithm reduces completion time by 5ms and 2ms, respectively, compared to standard HEFT.

关键词： Costs control engineering Processor scheduling Conferences Merging Power systems Standards

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Influence Analysis and Countermeasure research of dynamic Characteristics of Measurement system on Bridge Arm Current differential Protection in MMC-HVdC system 18

Influence Analysis and Countermeasure Research of Dynamic Ch...

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18th International Conference on AC and dC Power Transmission, ACdC 2022

作者： Chen, Qinlei Guo, Qi Lin, Xuehua Huang, Libin Li, Shuyong State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China National Energy Power Grid Technology R&D Centre 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)9781839537615

ISBN: (纸本)9781839537615

Aiming at the action phenomenon of bridge arm current differential protection after AC fault recovery of a modular multilevel converter high voltage direct current (MMC-HVdC) project, the characteristics of differential current are *** influence of temporary block strategy and dynamic characteristics of measurement system on differential current are studied, and the mechanism of differential current and the reasons for the action of bridge arm current differential protection are revealed. Based on the real-time digital physics closed-loop simulation platform, the action phenomenon of bridge arm current differential protection in the field is reproduced and the influence of the dynamic characteristics of the measurement system on the bridge arm current differential protection of the bridge arm is analyzed. The optimization measures are proposed from two aspects: the dynamic performance of the measurement system and the configuration of bridge arm current differential protection. The research results provide technical support for the design of MMC-HVdC project and the impact assessment of dynamic performance of measurement system on MMC-HVdC protection. © ACdC 2022. All rights reserved.

关键词： Simulation platform

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An Experimental Study on Optimization of Ammonia Co-Firing to a Bench-Scale Pulverized Coal Combustion system

SSRN

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SSrN 2024年

作者： Chae, Taeyoung Sim, Woohyun Lee, Jae Wook Yang, Won Baek, Sehyun Park, Kyoungil Low-Carbon Emission Control Technology R&D Department Korea Institute of Industrial Technology Cheonan31056 Korea Republic of Department of Green Process and System Engineering Korea University of Science and Technology Daejeon Korea Republic of KEPCO Research Institute Daejeon Korea Republic of

Co-firing ammonia with pulverized coal in power plants has become one of the most feasible options for reducing CO2 emissions. This study aims to investigate the combustion and NOx emission characteristics for various methods of ammonia injection, and to find an optimal solution for system modifications in a single burner in low co-firing ratio up to 20% (basis of lower heating value (LHV)). An 80 kWth-scale furnace and pulverized coal burner were used for the combustion tests, and four different nozzles with various directions and velocities of ammonia injection were tested for co-firing ratios in the range of 0 to 20%. Side-wall injection at various positions was also tested for a 20% co-firing ratio. Composition of combustion gas (O2, CO2, CO, NO and unburned ammonia) for each experimental case was measured. From the experimental results, we found the optimal injection velocity and direction for different co-firing ratios, and side-wall injection was observed to not be advantageous due to higher NOx emissions or the detection of unburned ammonia in the combustion gas. It was also found that the addition of ammonia could provide another viable option for controlling combustion and NOx formation by injecting it into a zone of high temperature and reducing atmosphere formed by the intensive release of volatiles from the coal. Temperature distribution and heat flux in the furnace were also measured, and they decreased considerably at higher co-firing ratios. These lower flame temperatures and reduced particle concentrations are the major causes of the decrease in radiative heat transfer. These results can be utilized for retrofitting the design of coal power plants to ammonia co-fired plants, with minimum modifications. © 2024, The Authors. All rights reserved.

关键词： Ammonia

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Closed-loop Simulation Method of Stability control system Based on Virtual Component Technology 6

Closed-loop Simulation Method of Stability Control System Ba...

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6th IEEE Conference on Energy Internet and Energy system Integration, EI2 2022

作者： Ma, Qinfeng Zhu, Yihua Liu, Mingshun Chang, dongxu Pu, Qingxin Li, Chengxiang Power Dispatching Control Center of Guizhou Power Grid Co. Ltd Guizhou China Southern Power Grid State Key Laboratory of HVDC Electric Power Research Institute China Guangzhou China National Energy Power Grid Technology R&D Centre Guangzhou China China Southern Power Grid CSG Key Laboratory for Power System Simulation Electric Power Research Institute Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China

ISBN: (纸本)9798350347159

The stability control system is an important means to ensure the safe and stable operation of the power system. In view of the shortcomings of the existing offline/real-time simulation test methods, a closed-loop simulation scheme based on virtual component technology is proposed. The virtual component technology of the stability control device is researched, and the virtualization method of the external hardware interface of the device is designed. On this basis, a closed-loop simulation framework of the stability control system under the offline/real-time simulation test environment is proposed. The functional logic of each component under the framework are analyzed. The calculation and feedback process of the entire closed-loop simulation system are analyzed in depth, which effectively solves the difficulty of simulation analysis and test verification of large-scale stability control system, providing a new method for the research and verification of stability control system strategy. © 2022 IEEE.

关键词： control system stability

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