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

作者： Su, Yinsheng Xin, Qingming Zhao, Xiaobin Xie, Huifan Liu, Hongtao Cao, Rinbin Guo, Long Feng, Junjie China Southern Power Grid Power Dispatching Control Center Guangzhou China China Southern Power Grid State Key Laboratory of HVDC Electric Power Research Institute Guangzhou China

ISBN: (纸本)9798350345520

The wide-frequency model of HVDC system is an important tool to study the harmonic and interference characteristics in wider frequency band. The actual structure of HVDC key equipment are studied, and the influence of its stray parameters on the wide-frequency model is analyzed, taking into account inter-turn stray capacitor and skin effect at high frequencies of converter transformer and smoothing reactor, wide-frequency model of key equipment is established, and compare it with the measured resistance-frequency characteristic curve to prove the accuracy of wide-frequency model. Based on the wide-frequency model of key equipment, wide-frequency model of HVDC system is established, and the harmonic characteristics are compared with common model and the measured waveforms. The results show that the wide-frequency model can reflect the harmonic characteristics more accurately, and the accuracy and validity of the model are also verified. © 2023 IEEE.

关键词： Harmonic analysis

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Research on Multi-Stage Optimal Investment Decision Method of Integrated Energy System in Southwest Border Region Considering Multiple Uncertainties 3

Research on Multi-Stage Optimal Investment Decision Method o...

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3rd International Conference on Energy, power and Electrical Technology, ICEPET 2024

作者： Lu, Jianbin Han, Shuai Ao, Yueliang Ruan, Shiya Zhong, Weicheng Electric Power Research Institute Guangxi Power Grid Co. Ltd. Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Nanning China Chongzuo Pingxiang Power Supply Bureau Guangxi Power Grid Co. Ltd. Chongzuo China Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Nanning China

ISBN: (纸本)9798350352658

The planning and construction of regional integrated energy system has a long-time span, and it is often based on the expansion planning of existing energy facilities to meet the increasing demand of load. A long planning period is easily disturbed by many external uncertainties, which leads to the deviation of the planning results from the predetermined goals. Therefore, considering the load and resource characteristics of the southwest cross-border region, this paper investigated and sorted out the influencing factors that affect the economic investment of its integrated energy system, and constructed a multi-level and staged economic evaluation index system of integrated energy system investment, introduced sensitivity and Monte Carlo simulation methods. The evaluation method of economic comprehensive evaluation index of uncertainty factors based on dynamic simulation and quantitative calculation was proposed. Finally, the system capacity allocation under economic optimal conditions was simulated through the dynamic simulation platform of a typical cross-border regional integrated energy system, and the multistage investment decision-making scheme of border cross-border fixed resources and flexible resources was summarized and refined. © 2024 IEEE.

关键词： Energy economics

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A Forecast Error Correction Method Based on Seq2Seq and Auto Encoder for Short-term Wind power Forecast Enhancement

A Forecast Error Correction Method Based on Seq2Seq and Auto...

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2024 IEEE IAS Industrial and Commercial power System Asia, I and CPS Asia 2024

作者： Ma, Haoyu Yang, Ming Han, Zifen Wang, Bo Che, Jianfeng Li, Menglin Control Shandong University Key Laboratory of Power System Intelligent Dispatch Jinan China State Grid Gansu Power Grid Corporation Lanzhou China China Electric Power Research Institute National Key Laboratory of Renewable Energy Grid-Integration Beijing China

ISBN: (纸本)9798350352290

Accurate wind power forecast (WPF) is highly significant for the safe and economic operation of power systems, and implementing error correction is a common and effective manner to further enhance the forecasting performance. Nonetheless, existing error correction methods fail to consider temporal relationship and may inadvertently increase the error under certain circumstances, thereby compromising the local precision of forecast. In order to address these issues, this paper proposes an error correction model based on Seq2Seq and auto encoder (AE) to improve forecasting accuracy. Firstly, the seq2seq with attention mechanism is introduced to infer the probable error sequence through learning the temporal relationship between the numerical weather prediction sequence and the actual error sequence. Secondly, the samples that the seq2seq providing a positive error inference are collected and the AE model is employed to extract the meteorological features at these moments. Finally, on the basis of the above two models, the error correction method is constructed consisting of preliminary error inference and posterior correction determination. Using operational data from Ningxia province, the proposed method is validated for its remarkable superiority based on the evaluation metrics. © 2024 IEEE.

关键词： Wind forecasting

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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 4

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

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4th International Conference on intelligent power and Systems, ICIPS 2024

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

ISBN: (纸本)9798331532765

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. © 2024 IEEE.

关键词： Simulated annealing

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An Improved MP Algorithm for power System Mode Identification 4

An Improved MP Algorithm for Power System Mode Identificatio...

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2023 4th International Conference on Electrical Technology and Automatic control, ICETAC 2023

作者： Meng, Xuanren Liu, Mosi Li, Jinzhao Zheng, Kun Electric Power Research Institute of Guangxi Power Grid Co. Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Nanning530023 China

An improved matrix pencil (MP) algorithm for power system mode identification has been proposed in this paper. Aiming at the problem of inaccurate order determined by the singular value decomposition (SVD) step in traditional MP algorithms and the lack of Hankel structure in the reconstructed matrix, which leads to inaccurate identification under low signal-to-noise ratio (SNR) condition, singular entropy order determination is introduced. An iterative algorithm is proposed to calculate a reconstructed matrix with both Hankel structure and rank-deficient attributes. This reconstruction matrix has a better approximation effect and improves the identification accuracy of the MP algorithm under low SNR. The effectiveness of the proposed algorithm was verified by modal parameter identification of numerical signals and oscillation signals of the 4-machine and 2-area systems. The algorithm proposed in low SNR has higher accuracy than the traditional MP algorithm, and the reconstructed signal has a better fitting effect. © Published under licence by IOP Publishing Ltd.

关键词： Singular value decomposition

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L_(p) Quasi Norm State Estimator for power Systems

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Journal of Modern power Systems and Clean Energy 2022年第4期10卷 871-882页

作者： Zhongliang Lyu Hua Wei Xiaoqing Bai Daiyu Xie Le Zhang Peijie Li School of Electrical Engineering Guangxi UniversityNanningChinaand they are also with the Guangxi Key Laboratory of Power System Optimization and Energy TechnologyGuangxi UniversityNanningChin Power Dispatching Control Center of Guangxi Power Grid NanningChina

This paper proposes an L_(p)(0<p<1)quasi norm state estimator for power system static state *** with the existing L1 and L2 norm estimators,the proposed estimator can suppress the bad data more *** robustness of... 详细信息

This paper proposes an L_(p)(0power system static state *** with the existing L1 and L2 norm estimators,the proposed estimator can suppress the bad data more *** robustness of the proposed estimator is discussed,and an analysis shows that its ability to suppress bad data increases as p ***,an algorithm is suggested to solve the nonconvex state estimation *** introducing a relaxation factor in the mathematical model of the proposed estimator,the algorithm can prevent the solution from converging to a local optimum as much as ***,simulations on a 3-bus DC system,the IEEE 14-bus and IEEE 300-bus systems as well as a 1204-bus provincial system verify the high computation efficiency and robustness of the proposed estimator.

关键词： power system bad data quasi norm estimator robustness state estimation

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Modeling of Large-Scale Hydrogen Storage System Considering Capacity Attenuation and Analysis of Its Efficiency Characteristics

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Energy Engineering 2024年第2期121卷 291-313页

作者： Junhui Li Haotian Zhang Cuiping Li Xingxu Zhu Ruitong Liu Fangwei Duan Yongming Peng Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology Ministry of Education(Northeast Electric Power University)Jilin132012China Ministry of Science and Technology Electric Power Research Institute of State Grid Liaoning Electric Power Co.Ltd.Shenyang110006China Northeast Electric Power Dispatching Control Center Northeast Branch of State Grid Corporation of ChinaShenyang110180China

In the existing power system with a large-scale hydrogen storage system,there are problems such as low efficiency of electric-hydrogen-electricity conversion and single modeling of the hydrogen storage *** order to improve the hydrogen utilization rate of hydrogen storage system in the process of participating in the power grid operation,and speed up the process of electric-hydrogen-electricity *** article provides a detailed introduction to the mathematical and electrical models of various components of the hydrogen storage unit,and also establishes a charging and discharging efficiency model that considers the temperature and internal gas partial pressure of the hydrogen storage *** models are of great significance for studying and optimizing gas storage *** these models,the performance of gas storage units can be better understood and *** studies are very helpful for improving energy storage efficiency and sustainable *** factors affecting the charge-discharge efficiency of hydrogen storage units are *** integrating the models of each unit and considering the capacity degradation of the hydrogen storage system,we can construct an efficiency model for a large hydrogen storage system and power conversion *** addition,the simulation models of the hydrogen production system and hydrogen consumption system were established in MATLAB/*** accuracy and effectiveness of the simulation model were proved by comparing the output voltage variation curve of the simulation with the polarization curve of the typical hydrogen production system and hydrogen consumption *** results show that the charge-discharge efficiency of the hydrogen storage unit increases with the increase of operating temperature,and H2 and O2 partial voltage have little influence on the charge-discharge *** the process of power conversion system converter rectification operation,its efficiency decreases wi

关键词： Hydrogen storage system simulation modeling electrolyzer fuel cell capacity loss

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A biomacromolecular additive based on pullulan polysaccharide to enhance the life of lead-acid battery packs in DC systems 3

A biomacromolecular additive based on pullulan polysaccharid...

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2024 3rd International Conference on power System and Energy Technology, ICPSET 2024

作者： Meng, Xuanren Wang, Xiaoming Lin, Xiangyu Dou, Qian Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Electric Power Research Institute Guangxi Power Grid Co. Nanning530023 China

With the rapid growth in demand for mobile power, lead-acid batteries still occupy a large market share due to their excellence in energy storage. However, their lifespan is affected by various factors, which limits the application efficiency and environmental friendliness. In this regard, this paper proposes a method to enhance the service life of lead-acid battery packs by applying biomacromolecule additives. A lead-acid battery pack modification method is investigated by introducing chitosan, a natural macromolecule with excellent electrical conductivity and biodegradation properties, into lead-acid batteries. So that the chitosan-modified material forms a stable and protective film on the surface of the battery electrode plate, thereby reducing the analysis of sulphate crystals on the electrode surface. The method of modification of lead-acid battery packs has been studied. Comparative analysis of the experimental data shows that the modified battery pack exhibits lower charge transfer impedance and better electrochemical stability than the traditional lead-acid battery during the cyclic charge/discharge test. Through the cycle charge/discharge test, the energy loss of the battery with biomolecules is 30% lower than that of the unmodified battery, and the number of charge/discharge cycles increases by 60%, which effectively prolongs the service life of the lead-acid battery. The progress of this paper not only has guiding significance for the performance improvement of traditional lead-acid batteries but also provides a significant theoretical and experimental basis for the development and application of environmental friendly battery materials. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Chitosan

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Equivalence analysis of different sequence impedance modeling methods 6

Equivalence analysis of different sequence impedance modelin...

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6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Fang, Qiao Xing, Facai Jiang, Zhe Zhao, Yujing Wu, Cheng Power Grid Technology Center State Grid Shandong Electric Power Research Institute Jinan China Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan China Shandong Electric Power Dispatching and Control Center State Grid Shandong Electric Power Company Jinan China

ISBN: (纸本)9798350346671

The sequence impedance has a clear physical meaning and can be directly measured by commercial equipment, so it is widely used for stability analysis in the field of electrical engineering. It can be transformed from dq impedance indirectly or calculated based on Harmonic State Space (HSS) theory directly. This paper analyzes the equivalence of the above two methods. Firstly, the dq impedance model of grid-connected converter is established, and the equivalence of impedance in dq domain and sequence domain is proved by mathematical transformation. Then, modified sequence impedance model of grid-connected converter is established considering the frequency coupling phenomenon. On the other hand, the impedance model can also be obtained from HSS modeling with h order harmonics. Subsequently, the relationship between the modified sequence impedance and HSS impedance can be found. The former is a special case when the latter takes h=2. When considering the coupling effect of higher harmonics, HSS impedance model has higher accuracy. Finally, the accuracy and the equivalence of the above-mentioned two methods are verified by frequency sweep. © 2023 IEEE.

关键词： Harmonic analysis

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Analysis of Transformer Protection Performance and New Method Research in Renewable Energy HVDC Transmission Systems (CICED 2024) 11

Analysis of Transformer Protection Performance and New Metho...

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11th China International Conference on Electricity Distribution, CICED 2024

作者： Yan, Xu Wen, Tao Li, Yan He, Jiawei Zhou, Bohao Tianjin University Key Laboratory of Smart Gird of Ministry of Education Tianjin China Power Dispatching and Control Center Guangdong Power Grid Co Ltd Guangzhou China Electric Power Research Institute China southern Power Grid Guangzhou China

ISBN: (纸本)9798350368345

The focus of this study is on transformers in large-scale renewable energy HVDC transmission scenarios. It highlights that when faults occur in transformers at the renewable energy sending end, the differential current exhibits high harmonic characteristics. Research indicates that the traditional second harmonic restraint criterion in transformer protection may block protection during internal faults in step-up transformers, thereby prolonging the protection response time. To address this issue, the paper proposes a transformer time-domain equivalent inductance method based on fitting weights. This method, combined with parameter identification, calculates the equivalent inductance to intuitively reflect the transformer's state and uses the fitting error to construct cumulative weights. This approach overcomes the significant fluctuations associated with traditional time-domain calculations, thereby enhancing the stability and reliability of the protection. Finally, simulation tests validate the effectiveness of this method. © 2024 IEEE.

关键词： Transformer protection

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