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Optimal Scheduling of Thermoelectricity in Integrated Energy System Based on Waste Heat Recovery from power to Gas and Flexible Thermoelectricity Ratio 6

Optimal Scheduling of Thermoelectricity in Integrated Energy...

引用

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

作者： Yang, Dongmei Gao, Yu Wang, Qi Chen, Yan Guo, Yuchen Wang, Meng Nari Technology Co. Ltd. The State Key Laboratory of Smart Grid Protection and Operation Control Nanjing China Nanjing Normal University School of Nari Electric and Automation Nanjing China

ISBN: (纸本)9798350347159

Aiming at the anti-peak shaving characteristics of wind power and the problem of wind curtailment caused by the 'fixing electricity by heat' of CHP units, an optimal scheduling method in integrated energy systems based on waste heat recovery from power to gas(P2G) and flexible thermoelectricity ratio in CHP is proposed. First, the P2G energy coupling mechanism and the feasibility of P2G waste heat recovery and utilization are analyzed. P2G equipment is introduced into the system and the remaining heat is recycled and utilized to promote wind power grid-connected consumption. Then, the principle of flexible thermoelectric ratio adjustment of CHP is analyzed, so that CHP can adjust the thermoelectric ratio following the trend of wind power output and the energy supply pressure of electric heat load, so as to improve the wind power consumption capacity of the system. Finally, the optimal scheduling model of the integrated energy system is constructed with the goal of minimizing the daily operating cost. The simulation example shows that the proposed scheduling method optimizes the thermoelectric coupling relationship of the system, effectively improves the wind power absorption capacity of the system, and has good social and economic benefits. © 2022 IEEE.

关键词： Wind power

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Path optimizing of UAV inspection for 500kV AC transmission line cup-tower based on ant colony algorithm 2

Path optimizing of UAV inspection for 500kV AC transmission ...

引用

2023 2nd International Conference on Smart grid and Green Energy, ICSGGE 2023

作者： Guo, Hao Liu, Shushan Xu, Li Wang, Zhigang Li, Hui Chen, Bin Ultra High Voltage Transmission Company of State Grid Hunan Electric Power Co. Ltd Hengyang421000 China Key Laboratory of Hunan Province Changsha410100 China Live Inspection and Intelligent Operation Technology State Grid Corporation Laboratory Changsha410100 China College of Electrical Engineering & New Energy China Three Gorges University Yichang443002 China

To ensure unmanned aerial vehicles (UAVs) complete the inspection task of a high-voltage transmission line safely and effectively, it is necessary to consider the interference of a complicated electromagnetic field near a high-voltage transmission line and determine a reasonable inspection distance and path of the UAV. Taking the 500kV EHV AC power line as an instance, firstly, the three-dimensional model of the 500kV ZV1 cup-tower is built, and the finite element method (FEM) is used for computing the electric field and magnetic field of the UAV exterior. According to inspection specifications, the electromagnetic field protection threshold of the UAV is determined, and then the safety area between UAV and the split conductor is determined to be equal to 1.5 m. Combined with the UAV shooting field of view and safety distance, the spatial positions of UAV hovering shooting points are selected to ensure that UAV flies in a safe area. Finally, the path of UAV traversing hovering shooting points is optimized by the ant colony algorithm (ACO), and the optimal path distance is 109.4 m. © Published under licence by IOP Publishing Ltd.

关键词： Inspection

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Real-time and Scalability of Smart Two Ticket System Based on Edge Computing in power grid Management

Real-time and Scalability of Smart Two Ticket System Based o...

引用

Data Science and Information System (ICDSIS), IEEE International Conference on

作者： Chengwei Huang Jia Zeng Fayan Zhang Yubo Zhang Wei Zhang Power Supply Bureau of Guangxi Hezhou Power Grid Co. Ltd. Hezhou China Jia Zeng Guangxi Power Grid Co. Ltd. Nanning China Power Supply Bureau of Guangxi Hezhou Power Grid Co. Ltd Hezhou China Guangxi Key Laboratory of Intelligent Control and operation and Maintenance of Power Equipment Electric Power Research Institute of Guangxi Power Grid Co. Ltd. Nanning China Guangxi Key Laboratory of Intelligent Control and operation and Maintenance of Power Equipment Electric Power Research Institute of Guangxi Power Grid Co. Ltd Nanning China

ISBN: (数字)9798350381665

ISBN: (纸本)9798350381672

With the continuous development of Internet of Things (IoT) technology, edge processing platforms for power system characteristics have become an important technology. At present, many professional information systems of state grid Corporation of China are faced with the problem that information cannot be shared and collected. It is urgent to use the idea of the Internet of Things, high-performance edge computing and other methods to build an intelligent Internet of Things system. In this paper, a new intelligent Internet of Things system based on edge computing was studied according to the application requirements of smart grid for dynamic control, strategy management, data preprocessing, etc., aiming to reduce network transmission capacity, reduce operating costs, and further optimize equipment maintenance costs. Simulation experiments have shown that when the number of Centralized Unit of Execution and Heterogeneous Unit of Execution in the network was increased to 70 and 100, respectively, the unloading completion times of the schemes “HUE Cloud Edge” and “HUE-Cloud Edge GM” were between 0.25-0.45 and 0.2-0.4, respectively, which were lower than those of cloud and HUECloud Randomness.

关键词： Cloud computing Costs Scalability power system dynamics Real-time systems Smart grids Maintenance

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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...

引用

IEEE/IAS Industrial and Commercial power System Asia (I&CPS Asia)

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

ISBN: (数字)9798350352290

ISBN: (纸本)9798350352306

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.

关键词： Accuracy Wind energy Heuristic algorithms Wind power generation Predictive models Feature extraction Error correction Numerical models Wind forecasting Forecasting

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Evaluation of New Energy Theory Based on Data Recovery 5th

Evaluation of New Energy Theory Based on Data Recovery

引用

5th International Conference on intelligent Computing, Communication and Devices, ICCD 2019

作者： Lv, Qingquan Zhou, Qiang Zhao, Long Wang, Mingsong Gao, Pengfei Li, Jin Key Laboratory of Wind Power Integration Operation and Control State Grid Gansu Electric Power Research Institute Lanzhou China

ISBN: (纸本)9789811558863

With the rapid development of new energy power generation, the new energy grid connected in Gansu Province alone exceeds 20 million kilowatts. Due to the insufficient absorption capacity of the new energy market and other reasons, the problem of abandoning the wind and discarding the light has become increasingly prominent. The accuracy of theoretical power calculation is directly related to the statistics of abandoned photovoltaic quantity, while the theoretical power calculation relies on new energy data. Therefore, the accuracy of data is directly related to the accuracy of the theoretical power. In this paper, time series analysis algorithm is used to process and analyze the data of booster station, wind tower, irradiance station, wind turbine, and inverter of new energy station to ensure the availability and reliability of the data. Secondly, large data analysis is used to calculate the theoretical power of new energy. © 2021, The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Time series analysis

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An Enhanced Feature Extraction Method for power Cable FDR Test Results Based on First-Order Derivatives

An Enhanced Feature Extraction Method for Power Cable FDR Te...

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power and Energy (PandaFPE), Panda Forum on

作者： Shaoming Pan Yiyi Zhang Jie Tang Bo Feng Lei Zhang Jian Zhao Longfei Zhang Guangxi Key Laboratory of Intelligent Control and Operation of Electric Power Equipment Guangxi Power Grid Co. LTD. Electric Power Research Institute Nanning China

Nowadays, frequency-domain reflection (FDR) cascaded with inverse Fourier transform (IFT) is widely used to detect the position of a power cable defect and diagnosis the type of the defect. However, due to the lack of the FDR test result in low frequency band width caused by the hard ware, it is hard to directly distinguish the type of the defect with the IFT result. Thus, an enhanced feature extraction method for power cable FDR test results based on first-order derivatives (FODs) is proposed to enlarge the difference of the IFT result between the general part and degraded part of the cable, and make the difference between the results characterized by different types of defects more obvious. Both simulated result and experiment result indicate that the proposed method can valuably enhance the features of cable defects in FDR test result, and reduce the error of defect type judgment caused by the lack of the FDR data within low-frequency band width and some other environment noise.

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A Method for power Cable Space Charge Detection Based on Electric Field Stimulation

A Method for Power Cable Space Charge Detection Based on Ele...

引用

power and Energy (PandaFPE), Panda Forum on

Aging in XLPE will likely lead to space charge accumulation in it. In this paper, based on polarization and depolarization currents (PDC), a trapped charge measurement method is proposed, which can measure the accumulated space charge in XLPE. First, the de-trap current of trapped charge was extracted by subtracting the stable values of depolarization current and conduction current from the polarization current. Then, the $i_{\text{dt}}\cdot t\sim\ln(\mathrm{t})$ curve can be obtained from calculated parameters, which characterizes the density and depth of trapped charge. Finally, the method proposed in this paper were validated by changing different experimental conditions.

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Comparison and Testing of Equivalent Modeling Methods for Wind Farm Composed of Doubly-Fed Induction Generators

Comparison and Testing of Equivalent Modeling Methods for Wi...

引用

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

作者： Binjiang Hu Yihua Zhu Liang Tu Zun Ma Xian Meng Chao Xing 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 National Energy Power Grid Technology R&D Centre Guangzhou China Electric Power Research Institute of Yunnan Power Grid Co. Ltd. Kunming China

ISBN: (数字)9798331523527

ISBN: (纸本)9798331523534

For analyzing the power system with high penetration of wind power, it is important to establish accurate models of wind turbines and wind farms, which is a basic and important work. In the analysis of wind power grid integration, it is necessary to aggregate the equivalent value of the wind farm into one or a few wind turbines. At present, there are two commonly used equivalence methods: current source multiplication (commonly used in commercial software) and full dynamic aggregation method. The former achieves wind farm equivalence by multiplying the output current of a single wind turbine generator, while the latter dynamically aggregates the wind farm into one or several large wind turbine generators. There is still a lack of research on the differences between the two. Based on the actual wind farm structure, this paper studies the electrical characteristics of steady-state operation and transient fault ride through operation using single machine dynamic aggregation method and current source multiplication method separately, and compares the equivalent simulation results with the detailed wind farm simulation results. The equivalent accuracy of the single machine aggregation method and the current source multiplication method is calculated to provide a reference for method selection in wind farm equivalent modeling.

关键词： Reactive power Accuracy Simulation power system dynamics Doubly fed induction generators Wind farms Generators Wind turbines Impedance Transient analysis

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Research on Operating System Runtime Jitter control Method for Electromagnetic Transient Real time Simulation Calculation

Research on Operating System Runtime Jitter Control Method f...

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Computer Technology and Information Science (ISCTIS), International Symposium on

作者： Qi Guo Tianyu Guo Yuanhong Lu Haiping Guo Libin Huang Liang Tu State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation 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

Real-time electromagnetic transient simulation can quickly analyze and solve the problems in complex large-scale power systems, realize accurate prediction and diagnosis of faults, and is a necessary means to promote the implementation of new power systems. However, the real-time simulation of electromagnetic transient puts forward strict requirements for the real-time performance of the underlying operating system. In this paper, the test method of system runtime jitter on Linux platform is designed, and the causes of jitter are analyzed based on the test results, and the control method of runtime jitter is studied. The experimental results show that the jitter of the system can be controlled in nanosecond level after using the methods of interrupt shutdown, CPU core binding and configuration of NOHZ_FULL, which can meet the needs of real-time simulation of electromagnetic transient.

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Influence of capacitive voltage transformer parameters on harmonic transmission characteristics

Influence of capacitive voltage transformer parameters on ha...

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12th International Conference on Renewable power Generation (RPG 2023)

作者： X. Li T. Wu Y. Lv J. Jiang C. Zhang State Key Laboratory of Smart Grid Protection and Operation Control State Grid Electric Power Research Institute Nanjing People's Republic of China Xi'an Jiaotong University Xi'an People's Republic of China

Capacitive voltage transformer (CVT) has the advantages such as low insulation cost, small size and large electric field strength margin, so it is widely used in voltage measurement, relay protection and high frequency communication. However, CVT has the capacitors and inductors in its structure, these components are sensitive to frequency, so it can not accurately measure harmonics. Considering the stray capacitance and coupling capacitance of capacitive voltage transformer, the broadband response equivalent circuit model of CVT is established, and a cascade hierarchical analysis method is proposed to deduce the complete transfer function. On this basis, the influence of key parameters of CVT on harmonic transmission characteristics is simulated and analysed. The simulation results show that the increase of compensation reactor stray capacitance will make the resistance band move to the low frequency direction, the stray capacitance of the primary side of the intermediate transformer affects the attenuation degree of the high frequency band, and the effect of secondary side of transformer stray capacitance on the frequency response of CVT can be ignored. The results have reference significance for accurate harmonic measurement and manufacturing of CVT.

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