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检索条件"机构=Beijing Key Laboratory of DC Power Grid Technology and Simulation"

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Study on the Influence of Different Degrees of Deterioration of Oil-Paper Insulation on Partial Discharge Characteristics 10th

Study on the Influence of Different Degrees of Deterioration...

引用

10th Frontier Academic Forum of Electrical Engineering, FAFEE 2022

作者： Longfei, Li Tianbo, Wu Lei, Liu Xin, Wang Fei, Zhang Zhijie, Ge Shuobo, Zhang Hongshun, Liu State Grid Xinjiang Electric Power Research Institute Urumqi830011 China DC Technology Center of State Grid Corporation of China Beijing100053 China Shandong Provincial Key Laboratory of UHV Transmission Technology and Equipment Jinan250061 China

ISBN: (纸本)9789819934072

The experimental platform of partial discharge under AC/dc composite voltage is built, and the time–frequency characteristics, pulse waveform characteristics, spectrum characteristics, energy characteristics and entropy characteristics of partial discharge under different aging conditions and AC/dc working conditions are studied. It is found that with the increase of aging days, the dispersion of discharge decreases, the steepness of discharge waveform increases, the energy released by discharge increases, and the discharge becomes more intense. With the increase of dc content, the discharge decreases. When the aging time is the same, the discharge of extremely uneven field is more intense and the dispersion of discharge is smaller than that of slightly uneven field. © 2023, beijing Paike Culture Commu. Co., Ltd.

关键词： Partial discharges

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Physical Mechanism and Data Hybrid Modeling for Device-Level Emulation of Modular Multilevel Converter 8

Physical Mechanism and Data Hybrid Modeling for Device-Level...

引用

8th Asia Conference on power and Electrical Engineering, ACPEE 2023

作者： Xie, Minhua Peng, Yixuan Zhang, Jiayuan Tang, Haijun Zhu, Ruimin Fan, Wei State Grid Smart Grid Research Institute Co. Ltd. State Key Laboratory of Advanced Power Transmission Technology Beijing China Beijing Key Lab. of DC Grid Technol. and Simulat. State Grid Smart Grid Research Institute Co. Ltd. Beijing China North China Electric Power University School of Electrical and Electronics Engineering Baoding China State Grid Liaoning Electric Power Co. Ltd. Electric Power Research Institute of State Grid Liaoning Electric Power Co Ltd. Shenyang China

ISBN: (纸本)9798350345520

In the modular multilevel converter (MMC), the insulated gate bipolar transistor (IGBT) is one of the most important devices for power conversion. Therefore, an accurate and efficient model of the sub-module is significant for design, monitoring and diagnosis of valve towers. Due to the complex multi-physics field inside the semiconductor device, it is laborious to describe the physical mechanism model in detail. Traditional mechanism models cannot meet the requirements of digital twin applications. In this paper, a new modeling method for sub-modules based on long short-term memory neural network is developed and the model is integrated into the traditional model of MMC for simulation, which is a physical mechanism and data hybrid modeling method to retain both of their advantages. © 2023 IEEE.

关键词： power converters

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Abnormal data detection method of smart substation based on K-means-SVM 3

Abnormal data detection method of smart substation based on ...

引用

3rd International Conference on Electronics, Electrical and Information Engineering, ICEEIE 2023

作者： Zhai, Wei Wu, Yanping Qi, Bochao Xue, Tiantian Wu, Qing State Grid Tianjin information & telecommunication company Key Laboratory of Energy Big Data Simulation of Tianjin Enterprise Tianjin300143 China State Grid Tianjin Wuqing Electric Power Supply Company Tianjin301700 China State Grid Info & Telecom Co. Ltd Beijing China-Power Information Technology Co.Ltd Beijing102200 China

ISBN: (纸本)9781510671423

The safe operation of smart substation is an important guarantee to ensure the stability of power supply. Aiming at the problems of substation data anomaly identification caused by large amount of substation data, complex data and high dimension, an smart substation anomaly data detection method based on K-means-SVM is proposed in this paper. Firstly, the unlabeled substation data is transformed into labeled data by K-means method, and then the unsupervised classification results provided by K-means are used as the training data of SVM. After SVM training, use the trained plane to test the two types of data obtained by K-means clustering, use the accurate data predicted by SVM to retrain the SVM segmentation plane, and iteratively update the SVM segmentation plane according to this method until the error number of SVM prediction data is not changed. This method can effectively improve the accuracy and efficiency of substation abnormal data identification, so as to improve the operation and maintenance safety and equipment maintenance ability. © 2023 SPIE.

关键词： K-means clustering

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Fault Ride-through Control of Improved Voltage Drop Method for MMC-HVdc Connected Renewable Energy 12

Fault Ride-through Control of Improved Voltage Drop Method f...

引用

12th International Conference on Renewable power Generation, RPG 2023

作者： Zhang, Li Li, Shengnan Xu, Shoudong Li, Yong Chen, Qinlei Dong, Xuezheng Institute of System Analysis and DC Transmission Technology Electric Power Research Institute of Yunnan Power Grid Co. Ltd Kunming China Kunming Power Supply Bureau Kunming China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China State Key Laboratory of Alternative Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing China

Renewable energy connected to the grid via MMC-HVdc should have fault ride-through (FRT) ability. However, it is difficult to achieve reliable FRT without high-speed and reliable communication between converters in the system. The coefficient of the traditional voltage drop method is qualitatively set as a linear constant, making it difficult to quickly reach the required voltage under different faults. As a result, there are long step delays due to the coordination of converters in the system, which consequently causes the dc system to operate at high voltage during FRT. To address this problem, this paper analyzes the dynamic characteristics of the dc system and the principles of the traditional voltage drop method. Based on this analysis, FRT control of improved voltage drop method for MMC-HVdc connected renewable energy is proposed. Finally, a simulation model is constructed in the PSCAD/EMTdc simulation platform to verify the effectiveness of the proposed method. Additionally, the proposed method is compared with the traditional method. The results demonstrate that the proposed method reduces the step delay and achieves accurate and reliable FRT. © The Institution of Engineering & technology 2023.

关键词： HVdc power transmission

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A NON-UNIT ADAPTIVE TRAVELING WAVE PROTECTION METHOD FOR FLEXIBLE dc TRANSMISSION LINES BASED ON SUPPLEMENT OF VOLTAGE DATA 12

A NON-UNIT ADAPTIVE TRAVELING WAVE PROTECTION METHOD FOR FLE...

引用

12th International Conference on Renewable power Generation, RPG 2023

作者： Zhang, Li Li, Shengnan Xu, Shoudong Li, Yong Chen, Qinlei Yao, Kunpeng Institute of System Analysis and DC Transmission Technology Electric Power Research Institute of Yunnan Power Grid Co. Ltd Kunming China Kunming Power Supply Bureau Kunming China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China State Key Laboratory of Alternative Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing China

Traveling wave (TW) protection is crucial for ensuring the safety and stability of flexible dc transmission lines. Thereinto, shortening the sampling step is the key to improve the sensitivity of the derivative-based TW protection. However, higher sampling frequency is difficult to engineer and the protection performance will be constrained in case of the high resistance faults. To address this issue, a non-unit adaptive TW protection based on the supplement of voltage data has been proposed. Firstly, the voltage data is realized to complement utilizing the Lagrange's median theorem at the line boundary, which improves the sampling frequency. Then, it has been observed that the fault current variation is negatively correlated with transition resistance. Specially, the proposed protection takes this fully into account by incorporating the adaptive threshold that covers differences among various fault locations. Therefore, the proposed protection can effectively distinguish internal faults with high sensitivity. Finally, a two-terminal ±500kV MMC-HVdc (modular multilevel converter-high voltage direct current) system is built using PSCAD/EMTdc. The simulation results demonstrate that the line faults can be fast and correctly identified, even with 300 Ω fault impedance, in various fault scenarios. © The Institution of Engineering & technology 2023.

关键词： Electric fault currents

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Offline Parameter Identification Method Considering the Nonlinear Characteristics of grid-connected Inverter Controller 12

Offline Parameter Identification Method Considering the Nonl...

引用

12th International Conference on Renewable power Generation, RPG 2023

作者： Zhang, Li Li, Shengnan Xu, Shoudong Li, Yong Chen, Qinlei Jiang, Xinying Institute of System Analysis and DC Transmission Technology Electric Power Research Institute of Yunnan Power Grid Co. Ltd Kunming China Kunming Power Supply Bureau Kunming China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China State Key Laboratory of Alternative Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing China

The correct model parameters play important role in fault characteristics analysis and protection design. It is a necessity to identify the parameters based on external characteristics due to the problem of parameters black-box. However, existing studies lack concerns in the nonlinear control of the control system during the transient, and cannot analysis the transient characteristics of the converter. Therefore, the inverter parameter identification method based on the dynamic model of phase-locked loop (PLL) is proposed in this paper. It is revealed that the influence of the dynamic process of PLL on the identification model. Considering the dynamic characteristics of PLL, a transient current identification model is established. A parameter identification method based on structural similarity (SSIM) was proposed. simulation examples show that the proposed parameter identification method can identify parameters accurately. © The Institution of Engineering & technology 2023.

关键词： Phase locked loops

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A Generic Real-Time simulation Modeling Method of Modular dc Chopper for VSC-Based Offshore Wind Farm Connection System

A Generic Real-Time Simulation Modeling Method of Modular DC...

引用

power and Energy Engineering (ICPEE), International Conference on

作者： Longze Kou Yuqin Gao Huaiguang Gu Yang Gao Jin Li Fangyuan Li State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China Beijing Key Laboratory of DC Grid Technology & Simulation State Grid Smart Grid Research Institute Co. Ltd Beijing China

The dc chopper is a crucial equipment in VSC-based offshore wind farm connection system to dissipate the surplus power during fault scenarios and enhance the system fault ride through capability. The modular dc chopper technology has been used in real engineering project due to its good transient performance. It has numerous SMs stacked in arm bridge with different topologies and thus poses challenges to the electromagnetic modeling, simulation analysis and control system testing of the equipment. This paper proposes a generic electromagnetic modeling method of modular dc chopper, which is especially suitable for the real time simulation. It has both high simulation speed and accuracy and can be used to simulate modular dc chopper with different SM topology. The modeling method is validated and then implemented in real time simulation platform HYPERSIM. Hardware in loop testing of VBC of dc chopper is carried out and the study cases demonstrates that the real time model of modular dc chopper works properly under transient operation conditions.

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A Staged Strategy for MMC Offshore Converter Station Under Asymmetric AC Fault

A Staged Strategy for MMC Offshore Converter Station Under A...

引用

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

作者： Fangyuan Li Longze Kou Jiapei Zhou Jie Hao State Key Laboratory of Advanced Power Transmission Technology Beijing Key Laboratory of DC Grid Technology & Simulation State Grid Smart Grid Research Institute CO. LTD. Beijing China State Grid Shanxi Electric Power Company electric power Science Research Institute Shanxi China

At present, offshore wind power has become an important development direction for wind power generation. Offshore wind farms often use high-voltage direct current transmission technology with modular multi-level voltage source converters (MMC-HVdc) to transmit electricity to the grid. However, the fault response characteristics of offshore wind farms through the MMC-HVdc transmission system are different from those through AC transmission way. Therefore, it is significant that studying the fault ride through (FRT) technology of offshore wind farms through the MMC-HVdc grid connection system for practical engineering. An electromagnetic transient simulation model for an offshore wind farm composed of a direct drive permanent magnet synchronous generator (D-PMSG) connected to the grid is established through MMC-HVdc transmission technology. The mechanism and suppression strategy of overvoltage generation in the transmission network are provided during the fault clearance and recovery phase of the offshore wind farm HVdc transmission system under AC asymmetric faults. A two-stage improved control strategy for MMC-HVdc offshore converter station in response to asymmetric faults has been proposed, which is beneficial for the joint system to quickly recover from the post fault system voltage and suppress the overvoltage risk during the fault clearing phase. Finally, the proposed strategy is validated based on a domestic ± 500kV project in China, demonstrating its effectiveness.

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Photovoltaic Multi-Peak MPPT Method with Improved Particle Swarm Algorithm

Photovoltaic Multi-Peak MPPT Method with Improved Particle S...

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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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Research on Photovoltaic MPPT Based on Improved Butterfly Algorithm

Research on Photovoltaic MPPT Based on Improved Butterfly Al...

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IEEE International Conference on power and power and Renewable Energy (ICPRE)

ISBN: (数字)9798350377460

ISBN: (纸本)9798350377477

To solve slow response speed and poor stability of traditional MPPT algorithms under rapidly changing environmental conditions, a MPPT control strategy combining improved butterfly algorithm and disturbance observation method is proposed. Firstly, the butterfly position in the population is initialized by Tent map, increasing the search space; Secondly, Gaussian mutation strategy is introduced to make the algorithm break out of local extremes; Then, a dynamic probability switching mechanism is adopted to balance the weight relationship between global and local search, improving algorithm optimization efficiency; Finally, in the later stage, disturbance observation method is used to track the maximum power and reduce power oscillation. simulation examples show that the proposed algorithm can find the maximum power point quickly and accurately under both static and dynamic shading conditions, and the power output is more stable.

关键词： Maximum power point trackers Photovoltaic systems Renewable energy sources Heuristic algorithms Switches Aerospace electronics Stability analysis Oscillators Optimization

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