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A remote test method for power grid security and stability control system and its engineering application

A remote test method for power grid security and stability c...

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作者： Qi Guo Yihua Zhu Dongxu Chang Shengnan Li Yong Chen Mingkang Wu State Key Laboratory of HVDC Electric Power Research InstituteChina Southern Power Grid Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System CSG Key Laboratory for Power System Simulation Electric Power Research InstituteChina Southern Power Grid Electric Power Research Institute Ltd.of Yunnan Power Grid Co.

Security and stability control(SSC) system or special protection system(SPS) is an important means to ensure the safe operation of power grid. In view of the insufficiency that the current open-loop testing method cannot fully test the SSC system on-site, a remote real-time closed-loop test method is proposed. The solutions of key techniques such as information interaction, remote communication and signal conversion in remote test system are studied. Then the platform architecture and standard interface of the remote test system are designed. A remote test platform for SSC system is developed, and there application modes of the platform is deeply analysed. Finally, taking SSC system of Yunnan AC power outgoing grid as pilot application, experiment of two substations on-site is carried out. The results in practical project further prove the effectiveness of the method presented in this paper.

关键词： Security and stability control system Real-time simulation power communication network Remote closed loop test

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The research of configuration for stability control device in smart substation

The research of configuration for stability control device i...

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作者： Ye He Binjiang Hu Dongxu Chang Jie Zhang Lingfang Li Yixuan Chen Power Planning and Research Center Yunnan Power Grid Co. Ltd. State Key Laboratory of HVDC Electric Power Research InstituteChina Southern Power Grid Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System CSG Key Laboratory for Power System Simulation Electric Power Research InstituteChina Southern Power Grid

A unified specification to design and operate the stability control device in smart substation has not been formed yet, which has greatly affected the promotion and application of stability control device in smart substation. Thus, referring to the technical specifications of protection device and combining to the specificity of stability control device, a full and detailed configuration scheme is proposed to meet the requirement, including the device configuration principle, the access configuration of SV and GOOSE for variable primary connection types,the virtual terminal and soft switch. This solution is beneficial to standardize the R＆D of stability control device in smart substation, and to facilitate on-site debugging, operation and maintenance.

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Feasibility analysis of single-end equivalent modeling to LCC-HVDC transimission system 4

Feasibility analysis of single-end equivalent modeling to LC...

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4th IEEE Conference on Energy Internet and Energy system Integration, EI2 2020

作者： Wang, Bin Li, Zhizhong Guo, Qi Liu, Zhijiang Li, Shuyong Cui, Liu Tsinghua University Dept. of Electrical Engineering Beijing China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China National Energy Power Grid Technology RD Centre Guangzhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (纸本)9781728196060

The commutation failures seriously threaten the safe operation of hybrid AC/DC grid. Considering that commutation failure occurs only on the inverter side, it is very important to study the voltage controlled current source model of LCC HVDC single terminal measurement information with high equivalent accuracy, which is very important for the practicality of real-time electromagnetic transient simulation of LCC HVDC dynamic phasor model. In order to this problem, this paper further discusses the single terminal equivalent model of LCC HVDC system which does not depend on the measurement information of DC sending end AC system, and explores the estimation method of single terminal fast transient response of complex AC/DC coupling faults induced by AC side fault of LCC HVDC inverter station and participation of DC control separation. The error distribution of single terminal equivalent calculation is quantitatively analyzed to lay a foundation for the follow-up protection and control technology research. © 2020 IEEE.

关键词： Electric inverters

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FDTD analysis of transient fault induced travellingwave propagation for multi-branch distribution networks 47

FDTD analysis of transient fault induced travellingwave prop...

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47th International Conference on Vibroengineering

作者： Li, Minqiang Liu, Baiyang Wang, Chen Yu, Kun Wu, Yongze Zeng, Xiangjun Hechi Power Supply Bureau Guangxi Power Grid Co Ltd Hechi China Guangxi Key Laboratory of Power System Optimization and Energy Technology Guangxi University Nanning China Hunan Province Key Laboratory of Smart Grids Operation and Control Changsha University of Science and Technology Changsha China

Many methods are available to analyze the process of the travelling-wave propagation. Among these methods, the Finite Difference Time Domain (FDTD) method has a distinct advantage in calculating dynamic process of the travelling wave propagation in the time domain and is thus applied to the field of power system protection for researching transient fault induced travelling-wave propagation. The novelty of this paper is that the attenuation law of the traveling wave signal affected by the fork junction in the multi-branch distribution network is summarized and the cause of failure in the fault location based on the incipient travelling wave front method in distribution networks is found. © 2020 Minqiang Li, et al.

关键词： Finite difference time domain method

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Time -Frequency Analysis on Earth Fault Signal Response Based on the BLT Equation for MultiBranch Distribution Networks 12

Time -Frequency Analysis on Earth Fault Signal Response Base...

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12th IEEE PES Asia-Pacific power and Energy Engineering Conference, APPEEC 2020

作者： Li, Minqiang Liu, Baiyang Wei, Qiuzhen Yu, Kun Wang, Chen Zeng, Xiangjun Hechi Power Supply Bureau Guangxi Power Grid Co Ltd Hechi China Guangxi Key Laboratory of Power System Optimization and Energy Technology Guangxi University Nanning China Hunan Province Key Laboratory of Smart Grids Operation and Control Changsha University of Science and Technology Changsha China

ISBN: (纸本)9781728157481

The BLT equation as the foundation of electromagnetic topology has an advantage in calculation of complex systems, particularly ring and multi-branch networks and is thus widely applied in EMC and EMI fields. In this paper the BLT equation was introduced to the fields of distribution network protection for analyzing the earth fault signal response on each junction of the multi-branch distribution network. The BLT equation was derived and the scattering matrices were determined for the multi-branch distribution network. The voltage responses of earth fault signal on each junction in the time and frequency domain were analyzed. Finally, some conclusions which are benefit for researching and improving the travelling wave-based method were given. © 2020 IEEE.

关键词： Frequency domain analysis

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Modeling and simulation of intermittent arc effects on traveling wave based fault location techniques for distribution network 45

Modeling and simulation of intermittent arc effects on trave...

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45th International Conference on Vibroengineering

作者： Liu, Xiaoxin Kong, Biguang Yu, Kun Pu, Bicai Liu, Baiyang Feng, Jianhui Nujiang Power Supply Bureau Yunnan Power Grid Co Ltd Nujiang China Hunan Province Key Laboratory of Smart Grids Operation and Control Changsha University of Science and Technology Changsha China Guangxi Key Laboratory of Power System Optimization and Energy Technology Guangxi University Nanning China

With rapidly developing of the distribution networks the rate of the earth fault increases sharply. Aiming to fault location for distribution networks, many techniques are proposed and applied in distribution networks throughout the world. However, until now the technology for precise fault point location has not been successfully implemented in engineering practice. Traveling wave based methods as common techniques are widely applied in transmission line protection for locating fault point. However, these methods face severe challenge in fault location for distribution networks. The main reason is that the intermittent arc fault easily results in failure of detecting inceptive travelling wave and this intermittent arc is a common earth fault in distribution networks compared with transmission networks. In this paper, a simplified distribution line is built by making reference to the two parallel lossless transmission lines system. Then, the intermittent arc effects on traveling wave based method are modeled and discussed. Finally, the reason why these travelling wave based methods are hard to locate fault point precisely is illustrated. Copyright © 2020 Xiaoxin Liu, et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

关键词： Location

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Analysis of traveling wave based fault location method for distribution network with image processing 45

Analysis of traveling wave based fault location method for d...

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45th International Conference on Vibroengineering

作者： Kong, Biguang Liu, Baiyang Liu, Xiaoxin Pu, Bicai Feng, Jianhui Zeng, Xiangjun Nujiang Power Supply Bureau Yunnan Power Grid Co Ltd Nujiang China Guangxi Key Laboratory of Power System Optimization and Energy Technology Guangxi University Nanning China Hunan Province Key Laboratory of Smart Grids Operation and Control Changsha University of Science and Technology Changsha China

Laws of traveling wave data related to fault location for medium voltage distribution network are discussed and summarized. Given the tree structure of a distribution network, an image of nodes voltage is created combining the use of real-time traveling wave meters at all nodes of the tree. The novelty of this paper is that travelling wavefront are analyzed based on the dynamic changes of these images. Based on principle of the traditional fault location with traveling wave-based method for transmission networks, traveling wave data of fault location for medium voltage distribution networks are plotted in order to estimate propagation velocity and distance between the fault position and the reference node. The results indicate that taking advantage of the laws of data related to first wave front can improve the reliability of the fault location for medium voltage networks. Copyright © 2020 Biguang Kong, et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

关键词： Wavefronts

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Optimization Scheme for the SSC Discrimination Logic of Xinsong-Dongfang HVDC under Small Islanded operation Mode

Optimization Scheme for the SSC Discrimination Logic of Xins...

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IEEE International Conference on power and Energy systems (ICPES)

作者： Yukun Zhu Chengxiang Li Yihua Zhu Dongxu Chang Shengnan Li Yong Chen State Key Laboratory of HVDC China Southern Power Grid Electric Power Research Institute Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System CSG Key Laboratory for Power System Simulation China Southern Power Grid Electric Power Research Institute Guangzhou China Electric Power Research Institute Yunan Power Grid Co Ltd Kunming China

ISBN: (纸本)9781665413268

The sending end of HVDC in islanded operation mode is a weak AC system, the security and stability control (SSC) system is very important for the operation of the islanded system. In this paper, the SSC strategy of Xinsong-Dongfang HVDC under islanded mode is deeply analyzed, and the defects and risks of the SSC discrimination logic for the small islanded operation mode is exposed during the RTDS simulation tests, as a result, some of the generators cannot be cut off. In addition, Then the research of the action sequence of SSC reveals the improper time coordination between the small islanded mode signal and the cut-off command. Based on the above work, an optimized scheme to discriminate the small islanded operation mode is proposed, and the correctness and effectiveness are verified through the same RTDS tests. This new method has great significance in the SSC design and implementation in HVDC transmission project with similar techniques.

关键词： HVDC transmission Standardization power system stability control systems Stability analysis Generators power grids

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Reactive power optimization for Distribution Network Based on Improved Bacterial Chemotaxis Particle Swarm optimization 12

Reactive Power optimization for Distribution Network Based o...

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12th International Symposium on Computational Intelligence and Design, ISCID 2019

作者： Huang, Qiang Tang, Jie Li, Hui Nie, Junfei Hunan Provincial Key Laboratory of Grids Operation and Control on Multi-Power Sources Area Shaoyang China

ISBN: (纸本)9781728146522

In this paper, the mathematical model of reactive power optimization is established by using objective function, in order to minimize the sum of power loss and investment cost of newly added reactive power compensation equipment, and an improved particle swarm optimization algorithm based on bacterial chemotaxis was proposed to solve the model. The algorithm takes particle swarm optimization algorithm as the standard, uses chaotic sequence to initialize the population, to improve the diversity of initial population, change the inertia weight and learning factor by using cosine nonlinear transformation, and enhance the global search and learning ability of particles, improves the accuracy of the algorithm, maintains the population diversity through bacterial chemotaxis, and improves the convergence stability of the algorithm. The simulation results in IEEE 30-bus system verify the effectiveness of the improved PSO algorithm in solving the reactive power optimization problem of distribution network. © 2019 IEEE.

关键词： Particle swarm optimization (PSO)

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operation Risks Analysis and Stability control system Optimization for the Junction Area of Multiple HVDC Sending system

Operation Risks Analysis and Stability Control System Optimi...

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International Conference on power system Technology (powerCON)

作者： Yukun Zhu Yihua Zhu Dongxu Chang Jiawei Yu Shengnan Li Yong Chen 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 Electric Power Research Institute Yunan Power Grid Co Ltd Kunming China

ISBN: (纸本)9781665407380

The successive commissioning of HVDC projects has enabled many substations or areas to connect with multiple sending ends of HVDC simultaneously, forming a junction area of multiple HVDC sending system. The operation risks in these areas have also changed accordingly. This paper focuses on the safe and stable operation of the junction area of multiple HVDC sending system, analyzing the current operation risks of the junction area and the adaptability of the regional stability control strategies at first. Then, an optimization scheme including regional stability control strategy design and structure configuration for the junction area is put forward, whose feasibility is verified through the stability control system of Huangping area, which is a typical junction area located in the sending ends of Jinguan-Guizhong and Xinsong-Dongfang HVDC. The Successful application in Huangping area also proves that the stability control system optamization scheme for junction area of multiple HVDC sending system proposed in this paper has good completeness and scalability, that is of great significance to the design for the stability control system of similar junction area.

关键词： Substations HVDC transmission systems operation Scalability power system stability control systems Stability analysis

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