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检索条件"机构=Hunan Provincial Key Laboratory of Power System Operation and Control"

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Dynamic Security Evaluation Method for power systems Considering Cascading Failures 7

Dynamic Security Evaluation Method for Power Systems Conside...

引用

7th IEEE Conference on Energy Internet and Energy system Integration, EI2 2023

作者： Liu, Ren Xu, Xingye Du, Wei Xiahou, Kaishun Zhu, Yihua Chang, Dongxu Guo, Hengdao Electric Power Research Institute of China Southern Power Grid Csg Key Laboratory For Power System Simulation Guangzhou China School of Electric Power Engineering South China University of Technology Guangzhou China Electric Power Research Institute of China Southern Power Grid State Key Laboratory of Hvdc Guangzhou China China Southern Power Grid National Energy Power Grid Technology R&d Centre Guangzhou China Intelligent Operation and Control For New Energy Power System Guangdong Provincial Key Laboratory of China Southern Power Grid Guangzhou China

ISBN: (纸本)9798350345094

With the increasing level of informatization and interconnection in the electric power system, the risk of external attacks on power systems is increasing. In response to the drawbacks of traditional static security assessment methods, this paper establishes two security metrics, which are voltage and power flow amplitude deviation security metric and power flow entropy security metric. Based on these security metrics, a dynamic security evaluation model that considers cascading failure is proposed. Simulation results demonstrate that the proposed security metrics can effectively reflect the security of cascading failure propagation, thereby providing valuable insights for decision-making by power system operators. © 2023 IEEE.

关键词： Informatization

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Optimization Study on the control Strategy of DC Line Fault Recovery for Yongren-Funing HVDC 6

Optimization Study on the Control Strategy of DC Line Fault ...

引用

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

作者： Zhu, Yukun Huang, Libin Li, Shuyong Zhu, Yihua Song, Yantao Liu, Ren State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China Electric Power Research Institute China Southern Power Grid CSG Key Laboratory for Power System Simulation Guangzhou China XJ Electric Co Ltd Xuchang China

ISBN: (纸本)9798350347159

The ±500kV Yongren-Funing HVDC transmission project is the first HVDC project whose sending and receiving ends are both located in the same province. When DC line fault happened under the condition of inter-communication fault between the pole control systems of the rectifier and inverter stations, the HVDC system cannot be blocked because of the frequent repeating actions of the DC line fault recovery in the inverter station. In order to solve the problem, an optimal control strategy of direct blocking HVDC system was proposed to solve the above issue. The optimization control strategy was verified by RTDS simulation. The simulation results showed that the proposed optimization control strategy of the DC line fault recovery could solve the above problems effectively. The proposed strategy has already been implemented on site permanently, which has great significance for the HVDC/UHVDC transmission projects in operation currently. © 2022 IEEE.

关键词： HVDC power transmission

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A Study of Nanosecond Clock Synchronization Methods for Real-Time Transient Simulation

A Study of Nanosecond Clock Synchronization Methods for Real...

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International Conference on Communications, Information system and Computer Engineering (CISCE)

作者： Qi Guo Yuanhong Lu Jingyue Zhang Jie Zhang Haiping Guo Binjiang Hu State Key Laboratory of HVDC Electric Power Research Institute China 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 Institute China Southern Power Grid Guangdong China

ISBN: (数字)9798350353174

ISBN: (纸本)9798350353181

Conventional nanosecond clock synchronization protocols are generally target-type or content-type, the synchronization rate is low, which leads to the increasing of the mean value difference of synchronization, so we propose to study the design of nanosecond clock synchronization method for real-time transient simulation. Combined with the actual clock synchronization requirements, we first calculate the link congestion coefficient, adopt a multilevel approach to strengthen the synchronization rate, set up a multilevel clock synchronization protocol, based on which we determine the clock source quality coefficients and construct a nanosecond clock synchronization model for real-time transient simulation, and use redundancy processing to achieve clock synchronization. The test results show that compared with the high-efficiency phase-color clock synchronization method and the cross-clock synchronization method, the mean synchronization difference of the designed transient simulation nanosecond clock synchronization method is controlled to be less than 0.5, which indicates that the designed clock synchronization method is more efficient, stable, and targeted, and the synchronization effect is significantly improved.

关键词： Protocols Redundancy Real-time systems Stability analysis Synchronization Transient analysis Thermal stability

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Two-level VSC real-time simulation modeling method based on controlled source compensation 2

Two-level VSC real-time simulation modeling method based on ...

引用

2nd International Conference on Energy, power, and Electrical Technology, ICEPET 2023

作者： Hu, Binjiang Xi, Xinze Zhu, Yihua Xing, Chao Li, Shuyong Ma, Zun Huang, Libin State Key Laboratory of HVDC Electric Power Research Institute CSG 11 of Kexiang Road Huangpu District Guangzhou510663 China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System 11 of Kexiang Road Huangpu District Guangzhou510663 China CSG Key Laboratory of Power System Simulation 11 of Kexiang Road Huangpu District Guangzhou510663 China Electric Power Research Institute of Yunnan Power Grid Co. Ltd. Kunming650217 China

ISBN: (纸本)9781510668270

The accurate modeling of two-level VSC is of great significance for the real-time simulation of new power systems, and the modeling of its core component switch group has attracted more and more attention. Since traditional binary resistance models require time to "backtrack" to accurately locate the switching moment, interpolation is difficult to use for real-time simulation. In this paper, a two-level VSC real-time simulation modeling method based on controlled source compensation is proposed. This method combines the controlled source model with the binary resistance model, uses the binary resistance model to ensure the simulation accuracy when the switching state is constant, and introduces the controlled source model to compensate for the error caused by the delay of the trigger signal when the switching state is switched. According to the two-level VSC real-time simulation model realized by this method, while reducing the non-characteristic subharmonics, the admittance matrix can be pre-stored, which effectively reduces the model computing resource occupation, and is suitable for a variety of complex power electronic system modeling methods. © 2023 SPIE.

关键词： Electric switches

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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...

引用

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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The Optimization Method for key control Parameters of Wind Turbines to Suppress Transient Overvoltage in Wind-Fire Bundling AC/DC power Delivery system

The Optimization Method for Key Control Parameters of Wind T...

引用

Intelligent power and systems (ICIPS), International Conference on

作者： Zhuohang Liang Wuneng Ling Chengxiang Li Zhencheng Liang Li Xiong Yangdou Liang Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Electric Power Research Institute China Southern Power Grid Guangzhou China Guangxi Power Grid Dispatch and Control Center Nanning China

ISBN: (数字)9798331532765

ISBN: (纸本)9798331532772

This paper analyzes the causes of overvoltage in the sending-end grid due to phase-change failures in the receiving-end grid, based on the operational principles and control methods of conventional high-voltage DC transmission. It systematically examines the operational characteristics of the sending-end grid voltage during transient processes. Considering the control strategy and output power expression of direct-drive wind turbines connected to the grid, and in accordance with current control requirements for voltage transients in wind turbine units, the study identifies parameter values affecting the control performance of voltage transients. It proposes a key control parameter optimization model aimed at minimizing fluctuations in the terminal voltage of wind turbines during voltage faults, integrating a simulated annealing optimization algorithm. Detailed implementation steps for optimizing key parameters are provided. Finally, the effectiveness of the proposed method in suppressing overvoltages at the terminal of wind turbines is validated using a model built on an electromechanical transient simulation platform.

关键词： Optimization models Process control Switches Simulated annealing power system stability control systems Wind turbines Voltage control Transient analysis power generation

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Mechanism and Influencing Factor Analysis of High Frequency Oscillation in PMSG-Based Wind Farm With Grid-Connected system 6

Mechanism and Influencing Factor Analysis of High Frequency ...

引用

6th IEEE International Conference on Energy Internet, ICEI 2022

作者： Luo, Chao Zhu, Yihua Huang, Libin Yu, Jiawei Electric Power Research Institute China Southern Power Grid State Key Laboratory of Hvdc 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: (纸本)9781665493277

Under the background of vigorously developing wind power, permanent magnet synchronous generator (PMSG)-based wind turbines have been widely used in offshore wind farms. However, the high frequency oscillations (HFOs) of PMSG-based wind farms with grid-connected system have occurred frequently in recent years, which have a bad impact on the safe and stable operation of the power system. And current researches only preliminarily reveal the mechanism, which are lacking in discussion on the key factors involved in HFOs. This paper establishes the high frequency impedance model of PMSG-based wind farm with grid-connected system. To identify the key factors involved in HFO, the impedance sensitivity method is used to obtain the quantitative relationship of the influence of each parameter on HFO. It can be concluded that the control delay, LCL filter parameters, collector lines parameters have the greatest influence on the HFO of the wind farm, but the characteristic of negative resistance caused by control delay is the root cause of HFO. Finally, this paper establishes the model of PMSG-based wind farm with grid-connected system on the PSCAD/EMTDC and verifies the correctness of the theoretical analysis. The conclusions of this paper can provide a reference basis for the mitigation strategies of HFOs. © 2022 IEEE.

关键词： Permanent magnets

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Study on Block Strategy Optimization of Passive Isolated Island operation of DXB UHVDC Project 6th

Study on Block Strategy Optimization of Passive Isolated Isl...

引用

6th PURPLE MOUNTAIN FORUM on Smart Grid Protection and control, PMF2021

作者： Huang, Run Zhang, Lifei Wu, Chen Li, Chengxiang Yang, Lei Wu, Mingkang Yunnan Power Grid Co. Ltd Kunming650011 China State Key Laboratory of HVDC China Southern Power Grid Electric Power Research Institute 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 China Southern Power Grid Electric Power Research Institute Guangzhou China

ISBN: (纸本)9789811671555

Due to the lack of generators at sending end in the early operation stage of the DXB UHVDC project, if it passively entered into island operation mode, the system will encounter harmonic instability and will cause a great risk to the steady operation. In previous projects, the common solution is to disconnect AC filters and block bipolar DC with a certain time delay when receiving island operation signal. However HVDC system may block valves, cut generation capacity or shed power by error when receiving false island operation signal. Therefore, the blocking strategy at low power under passive island mode has been improved. In DXB UHVDC project, the power on AC tie lines is used as criteria for island operation to prevent false action. The logic and realization of the control strategy are illustrated, then RTDS simulations are carried out and it is verified that by judging the power on AC tie lines, the system can effectively prevent from entering island mode by error. Finally, the field test proved that the proposed improved strategy will not cause rejecting of the existing "island blocking logic". The proposed strategy can be a reference to other DC projects. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Computer circuits

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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...

引用

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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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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