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Design and Application Research of Synchronous Temporary Block Function between Valve Groups on Modular Multilevel Converter Ultra High Voltage Direct Current system

Design and Application Research of Synchronous Temporary Blo...

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Sustainable power and Energy Conference (iSPEC)

作者： Qinlei Chen Xuehua Lin Zhijiang Liu Qi Guo Libin Huang Guanming Zeng Shuyong Li Deyang Chen Chao Luo Electric Power Research Institute China Southern Power Grid Guangzhou China CSG Key Laboratory for Power System Simulation China Southern Power Grid Guangzhou China State Key Laboratory of HVDC China Southern Power Grid Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System China Southern Power Grid Guangzhou China National Energy Power Grid Technology R&D Centre China Southern Power Grid Guangzhou China

ISBN: (纸本)9781665485234

Compared with the half controlled power electronic devices such as thyristor, the over-current ability of fully controlled power electronic devices such as insulated gate bipolar transistor (IGBT) is weak. In order to ensure that bridge arm current does not exceed the bearing range of modular multilevel converter (MMC) switching devices under AC fault ride through and other scenarios, MMC high voltage direct current (HVDC) system projects are equipped with temporary block (TB) function, IGBTs are protected by suspending the trigger pulse before bridge arm current reaches the maximum safe current of the switch. The structure of high side and low side valve group (VG) in series are adopted in ultra high voltage direct current (UHVDC) system. For line commuted converter (LCC) UHVDC system, the converter is current source type, During normal operation, there is no need to control the voltage balance between high side and low side VG, and after one VG is disturbed by commutation failure, the impact on another VG is relatively small. For MMC-UHVDC system, the converter is voltage source type, during normal operation, the voltage balance between high side and low side VG should be controlled. When a transient disturbance such as AC fault occurs, if one VG is temporary blocked due to bridge arm over-current, and another VG is not temporary blocked or the time of temporary blocked is later, the VG blocked first may tripped due to sub-module (SM) overall over-voltage or bridge arm over-current, and the scope of the accident is expanded, which is not conducive to the flexible and reliable operation of MMC-UHVDC. Therefore, the impact of non synchronous temporary block of MMC-UHVDC VGs is firstly analyzed in this paper, and then synchronous temporary block (STB) function between VGs is proposed, and the hardware interface scheme, STB signal sending and receiving logic, enable conditions and other aspects between VGs are elaborated. Finally, taking kunliulong project, the world’

关键词： Insulated gate bipolar transistors Multilevel converters Bridge circuits High-voltage techniques Switches Valves Real-time systems

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Advanced Out-of-Step Splitting Protection Simulation Platform with Considering High Frequency Generation Tripping and Low Frequency Load Shedding

Advanced Out-of-Step Splitting Protection Simulation Platfor...

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power systems and Electrical Technology (PSET), IEEE International Conference on

作者： Ren Liu Yukun Zhu Yihua Zhu Dongxu Chang Mingkang Wu Libin Huang State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China National Energy Power Grid Technology R&D Centre Electric Power Research Institute China Southern Power Grid Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Electric Power Research Institute China Southern Power Grid Guangzhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

This paper presents an advanced out-of-step (OOS) splitting protection simulation platform considering high frequency generation tripping and low frequency load shedding. In the proposed simulation platform, Real-Time Digital Simulator (RTDS) is utilized as the real-time power system simulator. Through the high-speed I/O card, real industry OOS splitting protection device is integrated into the proposed simulation platform. Based on the real China South power Grid (CSG) control strategy, high frequency generation tripping and low frequency load shedding components are modelled in the simulation. CSG real grid is modelled in the RTDS to perform the Real-time hardware-in-the-loop simulation. Simulation results present that there is a clear difference between with high frequency generation tripping results and without high frequency generation tripping results.

关键词： Performance evaluation Industries Hardware-in-the-loop simulation Load shedding Real-time systems power grids High frequency

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Optimal capacity allocation of pumped storage reservoirs considering the synergistic effect of small hydropower and agricultural irrigation in river basins

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Dianli Xitong Baohu yu Kongzhi/power system Protection and control 2025年第11期53卷 1-13页

作者： Zhong, Hao Liu, Haoyu Shi, Yu Wang, Qiujie Zhang, Yonghao Wang, Xinghuo Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydro-power Station China Three Gorges University Yichang443002 China College of Electrical Engineering & New Energy China Three Gorges University Yichang443002 China State Grid Hunan Electric Power Company Changsha Power Supply Branch Changsha410035 China

In order to alleviate the shortage of flexible resources in power systems in remote areas and to reduce economic losses caused by the fluctuating and uncertain output of wind and solar power stations, this paper proposes an optimal capacity allocation method for pumped storage reservoirs considering the synergistic effect of small hydropower and agricultural irrigation station in river basins. First, the method fully utilizes the idle capacity of agricultural irrigation stations during different seasons and integrates them with small hydropower plants to form a pumped storage aggregation unit. Then, the uncertainties of wind, solar and hydro power in different seasons are modelled using scenario sets. Based on Gale-Shapley bilateral matching mechanism, wind and solar power stations act as the selection party and aim to maximize economic returns in the optimization model. The pumped storage aggregation unit acts as the receiving party and a two-layer optimal allocation model is established. The upper layer focuses on maximizing annual profits to determine reservoir capacity allocation, while the lower layer targets maximizing aggregation benefits to optimize the aggregated system. Finally, the combination of particle swarm optimization algorithm and CPLEX solver is utilized to solve the model. Case studies show that the proposed method can fully leverage the flexible regulation capability of the pumped storage aggregation unit and effectively cope with the volatility and uncertainty of wind and solar output. © 2025 power system Protection and control Press. All rights reserved.

关键词： Hydro energy

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Comparative study of Amplitude Spectrum Estimation Methods for Vibration Test under Continuous Sinusoidal Excitation

Comparative study of Amplitude Spectrum Estimation Methods f...

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International Conference on Information Science and control Engineering (ICISCE)

作者： Xinbo Liu Yice Zhao Hunan Provincial Key Laboratory of Grids Operation and Control on Multi-Power Sources Area Shaoyang University Shaoyang China Hunan Provincial Key Laboratory of Power System Operation and Control Shaoyang University Shaoyang China

Amplitude spectrum estimation is a kind of effective method for the vibration states. The effects of several commonly spectrum estimation methods in sinusoidal logarithmic frequency sweep vibration test were studied and the anti-interference abilities of four amplitude spectrum estimation methods (Harmonic, Average, RMS and Peak) were tested under measurement noise and input noise. Besides, their results were compared under the same estimation situation. At the same time, the amplitude spectrum estimation under the second-order system with single degree of freedom was extended to the second-order system with multiple degrees of freedom. After testing, comparing and verifying, the research provides a basis for selecting the appropriate amplitude spectrum estimation method in the vibration test.

关键词： Vibrations Interpolation Estimation Interference Vibration measurement Harmonic analysis Frequency estimation

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Research on real-time simulation of wide area out-of-step system in CSG 4

Research on real-time simulation of wide area out-of-step sy...

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

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

ISBN: (纸本)9781728196060

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. © 2020 IEEE.

关键词： Electric fault currents

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Research And Implementation Of Real-Time Accurate Simulation Platform For Large-Scale Stability control system

Research And Implementation Of Real-Time Accurate Simulation...

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

作者： Yihua Zhu Dongxu Chang Qi Guo Hengdao Guo Binjiang Hu Mingkang Wu Yukun Zhu Duo Yu 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: (纸本)9781665434263

Based on the design characteristics of the stability control system, the control strategies of each station in the system are abstracted and integrated, and classified into standardized logic and customized logic. Based on the real-time digital simulation system platform, a three-layer architecture of the real-time simulation platform for the large-scale stability control system is designed. The standardized simulator based on FPGA/DSP and the customized simulator using device virtualization technology are designed in detail. The design scheme of the real-time accurate simulation platform for large-scale stability control system is proposed. From the perspective of hardware requirements, simulation accuracy, and platform adaptability, the differences between the simulation platform and the existing real-time digital simulation test platform are compared and analyzed.

关键词： Adaptation models Analytical models Digital simulation power system stability control systems Stability analysis Real-time systems

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Architecture design of application specific power chip security for power terminal in Smart Grid 6

Architecture design of application specific power chip secur...

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6th Annual International Conference on Network and Information systems for Computers, ICNISC 2020

作者： Lv, Zhining Tang, Tao Du, Yu Wang, Huiqin Zeng, Xiangjun Liu, Dongqi Shenzhen Power Supply Bureau CO. LTD Shenzhen518001 China Hunan Provincial Key Laboratory of Smart Grids Operation and Control Changsha University of Science and Technology Changsha410114 China

power terminal based on chip is the development demand of smart grid. Aiming at the problems faced by the current power terminal based on chip, an architecture design scheme, which includes power security subsystem (PSS) and application special power system (ASPS) is proposed in this paper for power terminal in smart grid. Then, concrete subsystem architectures of the PSS and ASPS are designed and described. The PSS provides data encryption and decryption, identity authentication and other security services while ASPS can improve the efficiency of data parallel execution and processing efficiency of power terminal. Therefore, the proposed architecture design can solve the problem of security and efficiency better for power terminal in smart grid. © 2020 Journal of Physics: Conference Series.

关键词： Smart power grids

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Computing Optimal Resilience-Oriented operation of Distribution systems Considering Heterogenous Consumer-Side Microgrids

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IEEE Transactions on Consumer Electronics 2024年

作者： Bai, Ziyi Xu, Da Zhou, Bin Yang, Xiaodong Yang, Hanyu Liu, Ju Hubei University of Technology Hubei Key Laboratory for High-Efficiency Utilization of Solar Energy and Operation Control of Energy Storage System Wuhan430068 China Hubei University of Technology School of Electrical and Electronic Engineering Wuhan430068 China University of Macau State Key Laboratory of Internet of Things for Smart City Macao999078 China China University of Geosciences School of Automation Wuhan430074 China Hunan University College of Electrical and Information Engineering Changsha410082 China Hefei University of Technology State Key Laboratory of High Efficiency and High Quality Electric Energy Conversion Hefei230009 China Nanjing Tech University College of Electrical Engineering and Control Science Nanjing211816 China SGCC Jingmen Power Supply Company Jingmen448000 China

Mobile battery energy storage systems (MBESs), also called power-to-mobility, have been field-validated as backup generation resources. However, the role of multi-energy coordination towards resilient distribution systems (DSs) against large area disasters is still not yet involved. To cope with such challenges, this paper proposes a computing optimal resilient operation model for post-disaster microgrid-penetrated DS recovery based on the energy-to-mobility approach. In this model, mobile multi-energy storages (MMESs) are invested and routed based on their different transportation mobility, while DS with consumer-side biogas-solar-wind multi-energy microgrids are topologized by network reconfiguration. The coordinated resilient operation of different recovery actions of DS, MMESs, and consumer-side microgrids is a difficult optimization problem as results of its inherent nonconvexities, temporal-spatial mobility and strong multi-energy couplings. The original mixed-integer non-linear programming (MINLP) problem is thus equivalently linearized and reformulated into a mixed-integer linear programming (MILP) for computation performance improvement. The proposed methodology is benchmarked and performed on a modified radial DS with three consumer-side microgrids. Numerical studies demonstrate the effectiveness and superiority of the energy-to-mobility scheme over MBESs on system resilient level and economy. © 1975-2011 IEEE.

关键词： Mixed-integer linear programming

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Magnetic field simulation and no-load loss calculation of large three-phase five-column disassembled transformer

Magnetic field simulation and no-load loss calculation of la...

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International Conference on Intelligent Computing, Automation and systems (ICICAS)

作者： Peng Zhihua Sun Yuqing Tan Mingjian Yin Jintian Lin Li Huang Guohua Tang Jie School of Electrical Engineering Shaoyang University Shaoyang Hunan China Hunan Provincial Key Laboratory of Power Grid Operation and Control in Multi-power Areas Shaoyang University Shaoyang Hunan China Hengyang Power Supply Branch of State Grid Hunan Electric Power Co. Ltd. Hengyang Hunan China

ISBN: (纸本)9781665428118

Due to the limitation of transportation conditions, the volume of the transformer cannot be increased indefinitely. Therefore, it is necessary to disintegrate the iron core for transportation. Due to structural changes, the magnetic field distribution of the transformer core may be disordered and the no-load loss is too large. This paper, based on the field-circuit coupled finite element, conducted the three-dimensional transient electromagnetic field simulation study on the no-load performance of a large-scale three-phase five-column disassembled transformer. The magnetic density, no-load current and no-load loss of the transformer iron core were calculated. The simulation results were consistent with the experiment, verifying the correctness of the simulation method.

关键词： Solid modeling Simulation Transportation Transformer cores Transformers Iron Software

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Three-dimensional Leakage Magnetic Field Simulation and Short-circuit Impedance Calculation of Large Yoke Transformer

Three-dimensional Leakage Magnetic Field Simulation and Shor...

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International Conference on Intelligent Computing, Automation and systems (ICICAS)

作者： Peng Zhihua Zeng Hongfa Tan Mingjian Yin Jintian Lin Li Huang Guohua Tang Jie School of Electrical Engineering Shaoyang University Shaoyang Hunan China Hunan Provincial Key Laboratory of Power Grid Operation and Control in Multi-power Areas Shaoyang University Shaoyang Hunan China Hengyang Power Supply Branch of State Grid Hunan Electric Power Co. Ltd. Hengyang Hunan China

ISBN: (纸本)9781665428118

Limited by road and railway transportation conditions, the volume of large transformers cannot be increased indefinitely. For this reason, it is necessary to compress the height of the transformer core for transportation. However, the change of the core size will cause problems such as uneven distribution of the leakage magnetic field, excessive loss of the leakage magnetic field, and changes in the short-circuit impedance. Based on Magnet software, a three-dimensional transient field simulation analysis of the short-circuit performance of a 500kV single-phase three-column yoke transformer was carried out in this paper, and the leakage magnetic field and winding short-circuit impedance of the yoke transformer were obtained. The simulation results were compared with the experimental values provided by the manufacturer, showing small error, which verified the simulation method, and provided theoretical guidance for transformer design in the actual engineering.

关键词： Solid modeling Analytical models Windings Transportation Transformer cores Transformers Magnetic fields

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