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作者： Yinsheng Su Mengxuan Guo Haicheng Yao Lin Guan Jiyu Huang Siting Zhu Zhi Zhong Department of Power System Operation China Southern Power Grid School of Electric Power South China University of Technology Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System

Small-signal stability(SSA) is important to power system security.A data-driven approach is established for rapid prediction of the power system oscillation *** key of the approach is the Graph Convolution Networks(GCN) with residual mechanism,which works to aggregate features from high-dimension steady-state operation information and is denoted as ResGCN(RESidual GCN) in the *** residual mechanism helps to overcome the network degradation *** the oscillation frequency and damping ratio of multiple modes can be predicted by the proposed *** performance of the proposed scheme as well as its adaptability to the power system topological changes is verified on the IEEE 39 Bus system.

关键词： Small-signal Stability Graph Deep Learning Graph Convolution Networks(GCN),Residual mechanism

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Simulation research on primary frequency regulation coordination control strategy of hybrid wind-PV-ES power station based on AGC

Simulation research on primary frequency regulation coordina...

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Annual Meeting of CSEE Study Committee of HVDC and power Electronics (HVDC 2023)

作者： S. Li Y. Hu X. He Y. Zhu T. He C. Luo C. Deng G. Zeng M. Su Yunnan Electric Power Research Institute Kunming People's Republic of China National Energy Power Grid Technology R&D Centre Guangzhou People's Republic of China State Key Laboratory of HVDC Electric Power Research Institute CSG Guangzhou People's Republic of China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou People's Republic of China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou People's Republic of China

With the increase of wind and solar renewable energy penetration in power system, the frequency control ability of power system completely depending on traditional power supply has weakened. This actuality requires that renewable energy stations should be equipped with a certain amount of energy storage to improve the primary frequency control ability. This paper considers the fast response ability and flexible control of energy storage for both charging and discharging, as well as its unique frequency response characteristics. Firstly, the control characteristics of the primary frequency regulation of the hybrid wind-solar-storage power station(Wind-PV-ES) are analyzed. By improving the automatic generation control(AGC) strategy of the hybrid Wind-PV-ES power station, a coordinated control strategy for the primary frequency regulation of the hybrid Wind-PV-ES power station is proposed for different frequency ranges based on the improved AGC control. After the primary frequency regulation action, the energy storage output is given priority control before wind and solar. When the energy storage active margin is insufficient, use the frequency regulation capacity of wind and photovoltaic power system to improve the primary frequency regulation capacity of the hybrid Wind-PV-ES power station. The control strategy proposed in this paper can improve the primary frequency regulation capability of renewable energy station. Finally, the paper verifies the effectiveness of the proposed control strategy through simulation.

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Research and Implementation of control Strategies for Multiple Transmission Modes in Yongren-Funing HVDC

Research and Implementation of Control Strategies for Multip...

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

作者： Yukun Zhu Libin Huang Shuyong Li Yihua Zhu Xuantao Jia a. State Key Laboratory of HVDC Electric Power Research InstituteChina Southern Power Grid Guangzhou China b. Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China c. CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China XJ Electric Co Ltd Xuchang China

The ± 500 kV Yongren-Funing HVDC transmission project is the first HVDC whose sending and receiving ends are both located in the same province, its inverter station is required to transmit power to different AC asynchronous grids according to the different requirements of the grid operation. The present control and protection system of HVDC cannot adapt to and meet the technical requirements of multiple power transmission modes. In order to achieve this goal, the control system of HVDC must be capable of automatic discrimination and sequential control, selecting the correct strategy of reactive power control (RPC), which is essential for the stable operation of the HVDC system. Therefore, based on the operating conditions of the HVDC system and the switch configuration of the AC switch yard of the inverter station, the principle, process and interlocking conditions of automatic switching between different transmission modes are systematically analyzed. Effects on RPC, last breaker and the over voltage protection of AC busbar are researched. The control strategies for multiple transmission modes have great significance for the similar HVDC/UHVDC transmission projects in the future.

关键词： Technical requirements Reactive power control HVDC transmission Design methodology Switches control systems Inverters

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

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

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

作者： Qinfeng Ma Yihua Zhu Mingshun Liu Dongxu Chang Qingxin Pu Chengxiang Li Power Dispatching Control Center of Guizhou Power Grid Co. Ltd Guizhou China 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 CSG Key Laboratory for Power System Simulation 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

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.

关键词： Analytical models Process control system integration power system stability control systems Stability analysis Hardware

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Fault diagnosis of broken rotor bar of traction motor based on Hilbert-Huang transform of rectifier input side current

Fault diagnosis of broken rotor bar of traction motor based ...

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第四届材料科学应用与能源材料国际研讨会

作者： Jintian Yin Xinbo Liu Li Liu Jie Tang Zhihua Peng Hunan Provincial Key Laboratory of Grids Operation and Control on Multi-Power Sources Area Shaoyang University School of Electrical Engineering Shaoyang University

Aiming at the problem of the serious noise pollution of motor stator current in traction drive system, a fault diagnosis method based on Hilbert-Huang Transform(HHT) of rectifier input side current is proposed. By introducing the switching function, the intermediate DC link and the rectifier input current is analyzed when the traction motor breaks down, then the characteristic components of the current frequency of rectifier input side is obtained. The rotor fault diagnosis can be realized by using HHT to analyze the current spectrum. Simulation experiment show that the proposed method can effectively diagnose faults, which provides a new method for the fault diagnosis of traction motor broken bars.

关键词： Fault diagnosis of broken rotor bar of traction motor based on Hilbert-Huang transform of rectifier input side current Hilbert

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Multi-task Transient Contingency Screening with Temporal Graph Convolutional Network in power systems

Multi-task Transient Contingency Screening with Temporal Gra...

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作者： Yinsheng Su Jiyu Huang Haicheng Yao Lin Guan Mengxuan Guo Zhi Zhong Department of Power System Operation China Southern Grid Co.Ltd. School of Electric Power South China University of Technology Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System

Rapid transient stability assessment(TSA) is an essential requirement for power system *** real-world applications,transient contingency screening(TCS) applies TSA approaches to address the pre-defined contingency sets under online operation *** by time domain simulation(TDS) is time-consuming,hence we propose a high-speed temporal graph convolutional network(TGCN) that achieves TSA decisions such that a large-scale contingency set can be scanned quickly with enough *** on multi-graph inputs to reflect the transient process,the TGCN utilizes the graph convolutional network(GCN) to extract topology representations and temporal convolution(TC) layers to encode temporal *** above graph embedding,two downstream networks are designed for stability classification and critical generator prediction,*** results on IEEE 39 Bus system demonstrate its superiority over existing models under different operation topologies,fault locations and clearing modes.

关键词： Temporal graph convolutional network (TGCN) Temporal convolution (TC) Transient contingency screening(TCS) Critical generator prediction

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Nonlinear Modeling of the VSC Grid-Connected system with controller Saturation

Nonlinear Modeling of the VSC Grid-Connected System with Con...

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Electrical Engineering and control Technologies (CEECT), Conference on

作者： Jiawei Yu Yihua Zhu Chengxiang Li Chao Luo State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China National Energy Power Grid Technology R&D Center Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China CSG Key Laboratory for Power Sytem Simiulation ELectic Power Reasearch institute China Southern Power Grid Guangzhou China

ISBN: (纸本)9781665499002

With the development of power electronics technology, the power system is now evolving into a new-generation power system dominated by renewable energy. Due to the physical limitations of power electronics, controller saturation is widely adopted in wind turbines and photovoltaics. In this paper, a nonlinear system model considering output saturation is proposed in the view of general dynamic systems. By defining saturation-activation vector L, all the saturations of the system are uniquely represented. Then, the proposed modeling method is applied to a voltage source converter (VSC) grid-connected system. Based on RTDS simulation, this paper revealed that a class of oscillations at a specific frequency are caused by the activation of the phase-locked loop (PLL) saturation. The frequency of the oscillation depends on the top and bottom boundaries of PLL saturation.

关键词： Photovoltaic systems Electrical engineering Renewable energy sources power systems Wind turbines Phase locked loops Nonlinear systems

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Transmission Line Fault Detection and Classification Based on Sa-Mobilenetv3

SSRN

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SSRN 2022年

作者： Xi, Yanhui Zhang, Weijie Zhou, Feng Tang, Xin Li, Zewen Zeng, Xiangjun Zhang, Pinghua Hunan Province Higher Education Key Laboratory of Power System Safety Operation and Control Changsha University of Science and Technology Hunan Province Changsha410114 China School of Electronic Information and Electrical Engineering Changsha University Hunan Province Changsha410022 China Hunan College of Information Hunan Province Changsha410200 China

Accurate fault detection and classification help to analyze fault causes and quickly restore faulty phases. This paper presents a robust fault classification method based on SA-MobileNetV3 for transmission systems. Considering that the SE (Squeeze-and-Excitation) attention module cannot aggregate the spatial dimension information on the channel, SA (shuffle attention) module is introduced into MobileNetV3, which can effectively fuse the importance of pixels in different channels and in different locations at the same channel. Also, transforming the signals into two dimensional images based on CWT (continuous wavelet transform) makes the proposed method be similar to image recognition, which can mine high level fault features and classify the faults visually. To verify the effectiveness of the method, a 735kV transmission line model is built for data generation through Simulink. Various kinds of fault conditions and factors are considered to verify the adaptability and generalizability. Simulation results show that the method can quickly and accurately identify 11 types of faults, and the accuracy rate is as high as 99.90%. A comparison between the proposed method and other existing techniques shows the superiority of the proposed SA- MobileNetV3, and better anti-noise performance makes it more suitable for real fault signals taken on-site. © 2022, The Authors. All rights reserved.

关键词： Simulink

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Hardware in Loop Real-Time Simulation Test Research and Engineering Application of Multi-Terminal Hybrid Ultra High Voltage DC Current control and Protection system

Hardware in Loop Real-Time Simulation Test Research and Engi...

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Sustainable power and Energy Conference (iSPEC)

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

ISBN: (纸本)9781665485234

The multi-terminal hybrid ultra-high voltage direct current (MTH-UHVDC) transmission technology combining line commuted converter ultra-high voltage direct current (LCC-UHVDC) technology and modular multilevel converter ultra-high voltage direct current (MMC-UHVDC), provides a more flexible and advanced mode to meet the needs of longer distance and larger capacity clean energy transmission. Compared with the two-end HVDC system, the control and protection (C&P) functional and dynamic characteristics of MTH-UHVDC transmission system are more complex. The real-time simulation technology must be used to carry out the experimental research before the engineering application. However, the hardware in loop (HIL) real-time simulation test of MTH-UHVDC transmission system is faced with many technical problems, such as multi-type interface of test system, accurate modeling of UHVDC MMC valve, full access of C&P devices, etc. Therefore, from the perspective of simulation test research and engineering application, this paper proposes a HIL real-time simulation test method for C&P system of MTH-UHVDC transmission system. The design of test system, accurate modeling of primary system, modeling of C&P system, interface technology of test system, functional and performance test method of C&P system and engineering application are deeply studied. Taking kunliulong project, the world’s first MTH-UHVDC project, as the application background, a real-time simulation test system for C&P system is established by the proposed method. The functional performance test (FPT) and dynamic performance test (DPT) are carried out using the established test system, and the simulation test waveforms are compared with the field test waveforms. The results show that the response characteristics of the two systems are consistent, and the test system established in this paper can meet the needs of accurate real-time simulation test and research, and can provide technical support for the application of M

关键词： Performance evaluation Current control Multilevel converters HVDC transmission High-voltage techniques systems modeling Valves

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Influence Analysis of Thermal States on Dynamic Frequency Response for power systems with High Renewables

Influence Analysis of Thermal States on Dynamic Frequency Re...

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2020 IEEE Sustainable power and Energy Conference, iSPEC 2020

作者： Cao, Yongji Zhang, Hengxu Li, Changgang Sun, Leshu Li, Chen Qin, Hao Guo, Qi Zhu, Yihua Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan250061 China State Key Laboratory of HVDC Electric Power Research Institute National Energy Power Grid Technology RD Centre 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 Guangzhou510663 China

ISBN: (纸本)9781728191645

As thermal generators are substituted by renewables, the power reserves are decreasing and the influence of boiler thermal states on frequency dynamics becomes more severe. The variations of thermal states can aggravate dynamic frequency response, especially for power systems with high renewables. However, the system frequency response (SFR) model has been widely adopted, but in which the thermal states are neglected. This paper analyzes the influence of thermal states on dynamic frequency response quantitatively. The modified SFR models are built by extending the boiler models with different simplification degrees. Then, from the view of the response amplitude and time, the quantitative indices are established to measure the response trajectories of modified SFR models. And the characteristics of frequency dynamics and the statistic indices of data sequences are utilized to analyze the influences of thermal states and assess the performances of modified SFR models. According to the results of comparative analysis, the neglect of thermal states incurs more optimistic frequency dynamics and impairs the frequency stability of power systems with high renewables. Additionally, the accuracy of the SFR model can be enhanced even with the most simplified boiler model. © 2020 IEEE.

关键词： Frequency response

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