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A Top-k QoS-Optimal Service Composition Approach Under Dynamic Environment 7th

A Top-k QoS-Optimal Service Composition Approach Under Dynam...

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7th International Conference on Artificial Intelligence and Security, ICAIS 2021

作者： Tian, Cheng Zhang, Zhao Yang, Sha Huang, Shuxin Sun, Han Wang, Jing Zhang, Baili School of Computer Science and Engineering Southeast University Nanjing211189 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China Nari Group Corporation Nanjing211106 China

ISBN: (纸本)9783030786083

To deal with low efficiency of existing Web service composition algorithms under dynamic environment, this paper proposes a Top-k QoS-optimal service composition algorithm based on QWSC-K static algorithm. The algorithm first considers the influence of dynamic environment on the existing service composition and service dependency graph, and classifies the changed services in dynamic environment. Moreover, different strategies are adopted to obtain the intermediate results of service composition for different categories of services. The influence of different service categories on the service dependency graph is analyzed to realize the updating of the service dependency graph. Finally, based on the updated service dependency graph and the intermediate results of the service composition, the adaptive incremental update can be applied to change the original service composition results, avoiding the time-consuming re-query process. Experiments show that the algorithm is efficient and accurate in dynamic environment. © 2021, Springer Nature Switzerland AG.

关键词： Quality of service

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Real Time Monitoring Method of Comprehensive Energy Consumption Based on Data Mining Algorithm

Real Time Monitoring Method of Comprehensive Energy Consumpt...

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作者： Qian, Gang Tang, Chenghong Meng, Yao Qi, Xiaomin Wang, Jingtao Zhou, Jing State Grid Shaoxing Power Supply Company Zhejiang Shaoxing312099 China State Grid Electric Power Research Institute Nanjing211106 China Nari Technology Development Limited Company Nanjing211106 China State Key Laboratory of Smart Grid Protection and Operation Control Nanjing211106 China China Electric Power Planning and Engineering Institute Beijing100120 China Beijing Nari Digital Technology Co. Ltd. Beijing100085 China

With the expansion of data centers, total consumption is growing exponentially. The center is faced with problems such as reducing power consumption, reducing costs and improving resource utilization. Reducing energy costs through monitoring is an important means of energy conservation in data centers. In recent years, more and more real-time energy consumption data are stored on the energy consumption management platform. There is a wealth of knowledge hidden in the energy consumption data in recent years. A large amount of data simplifies the traditional methods, and data mining methods have achieved good results in many fields. Therefore, it is of great significance to study a new energy consumption monitoring system and introduce data mining method into the system. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Energy utilization

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Load Flexibility Evaluation Method for Industrial Parks Based on SPA and TOPSIS

Load Flexibility Evaluation Method for Industrial Parks Base...

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System Simulation Technology and its Application (CCSSTA), IEEE China Conference on

作者： Yubo Wang Xiangyu Kong Yang Wang Haixuan Zhang Shunyu Wu Shuai Luo Tianjin Key Laboratory of New Energy Power Conversion Transmission and Intelligent Control Tianjin University of Technology Tianjin China Key Laboratory of Smart Grid Tianjin University Tianjin China State Grid Tianjin Electric Power Company Tianjin China State Grid Tianjin Electric Power Company Economic and Technological Research Institute Tianjin China

ISBN: (数字)9798350366600

ISBN: (纸本)9798350366617

With the requirement for an increased share of renewable energy, park load flexibility is needed to balance fluctuations between supply and demand. The factors affecting the load flexibility of the park are analyzed from four dimensions: high quality, high efficiency, security, and low carbon. The index system for evaluating the load flexibility of the park is constructed. Given the relevance of the load flexibility assessment indexes of the park, the grey entropy algorithm is improved, and the combined assignment method is proposed to enhance the assignment of the indexes’ weights. The quantitative assessment method of park flexibility is proposed based on the coupling of SPA (Set Pair Analysis) and TOPSIS (Technique for Order Preference by Similarity to Ideal Solution). The simulation shows that this method can solve the shortcomings of traditional TOPSIS well and make the quantitative assessment results of park load flexibility more accurate, which can be a guide for evaluating the flexibility of other urban industrial parks.

关键词： Couplings Technological innovation Supply and demand Green products Systems simulation Indexes Security Carbon Sustainable development Load modeling

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Carbon Emission Calculation and Low Carbon Transition Path Optimization Method for Electric Power Industry

Carbon Emission Calculation and Low Carbon Transition Path O...

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System Simulation Technology and its Application (CCSSTA), IEEE China Conference on

作者： Fanfan Yu Xiangyu Kong Shuai Luo Shunyu Wu Yubo Wang Yi Gao Tianjin Key Laboratory of New Energy Power Conversion Transmission and Intelligent Control Tianjin University of Technology Tianjin China Key Laboratory of Smart Grid Tianjin University Tianjin China Electric Power Company Economic and Technical Research Institute of State Grid Tianjin Tianjin China

ISBN: (数字)9798350366600

ISBN: (纸本)9798350366617

With economic development, the energy and power industry must balance power supply growth and carbon reduction requirements. To achieve the goal of“double carbon”, the power system needs to be transformed into green and low-carbon, and accurate carbon emission accounting has become a critical support. Due to the significant differences between cities and regions, emission reduction strategies vary. To this end, the article firstly clarifies the carbon emission accounting boundary of power generation enterprises, establishes a carbon emission accounting model for the power industry based on the IPCC inventory method of fuel consumption, and secondly constructs an enterprise low-carbon transition planning model by integrating technological, economic, environmental and other factors, researches and analyzes the path of power generation enterprises to achieve carbon-neutral transition by 2060, and simulates different low-carbon transition scenarios. The results show that achieving carbon neutrality appropriately in advance is beneficial to power generation enterprises to a certain extent, but advancing the process of carbon neutrality too early will lead to soaringcosts. In addition,future policies will push forward the scale of installed energy storage, and enterprises should make good use of technical and resource reserves. The power industry needs to formulate appropriate low-carbon transformation strategies according to its reality to ensure that it realize a win-win situation regarding economic and social benefits while realizing the goal of carbon neutrality.

关键词： Analytical models Costs Green products Carbon neutral Market research Power industry Planning Fuels Power generation Energy storage

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control Strategy of DC-DC Converter With Diode Rectifier for All-DC Offshore Wind Farms

Control Strategy of DC-DC Converter With Diode Rectifier for...

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IEEE General Meeting Power& Energy Society

作者： Guanghui Zheng Botong Li Xiangping Kong Zijun Bin Yan Tao The Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China Relay Protection Automation and Communication Technology Electric Power Research Institute State Grid Jiangsu Electric Power Co. Ltd. Nanjing China

ISBN: (数字)9798350381832

ISBN: (纸本)9798350381849

This paper investigates the control strategy of a DC-DC converter with modular multilevel converter (MMC) and diode rectifier (DR) face-to-face connection structure applied in all-DC offshore wind power system. To address the uncontrollability of the diode rectifier, this paper proposes a grid-forming control strategy based on the interdependencies among active power, reactive power, AC voltage amplitude, and frequency within this topology. The control objective is to enable the MMCs to establish a stable voltage and frequency for the AC system inside the DC-DC converter. Furthermore, the proposed control strategy also realizes the fast regulation of AC voltage and frequency during power fluctuations, contributing to the regular operation of the system under unstable conditions. Simulation results in PSCAD demonstrate the effectiveness of the proposed control strategy under startup and power fluctuation scenarios.

关键词： Reactive power Fluctuations Simulation Rectifiers DC-DC power converters Wind power generation Wind farms Frequency conversion Voltage control Frequency control

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A Novel Pre-synchronization control Strategy for Virtual Synchronous Generator Based on NLADRC-PLL 4

A Novel Pre-synchronization Control Strategy for Virtual Syn...

引用

4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Geng, Shaobo Wang, Qiang Ren, Jiangbo Li, Yongli Chen, Xiaolong Li, Song State Grid Hebei Electric Power Corporation Dispatching and Control Center Hebei China Tianjin University Key Laboratory of Smart Grid of the Ministry of Education Tianjin China

ISBN: (纸本)9781728171494

Due to the mismatched voltage amplitude, phase and frequency between virtual synchronous generator (VSG) and utility grid, there may exist significant impulse current when VSG connects to the gird through the point of common coupling (PCC). This paper designs a NLADRC-PLL and proposes a novel pre-synchronization control strategy to decrease the impulse current. Firstly, a phase lock loop based on nonlinear active disturbance reject control (NLADRC-PLL) is designed to obtain the voltage information of the PCC quickly and flexibly. Then, PCC voltage information obtained by NLADRC-PLL is embedded into both active and reactive control loops of VSG through certain logic control. Finally, the impulse current caused by the VSG-grid connection in the presence of PCC voltage magnitude, frequency and phase suddenly changing is effectively suppressed. Simulation results of 5 cases are given to demonstrate the effectiveness and feasibility of the proposed presynchronization control strategy. © 2021 IEEE.

关键词： Synchronization

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Optimization Method for Flexible Dispatch of Source, grid, Load and Storage Considering Different Photovoltaic Penetration Rates

Optimization Method for Flexible Dispatch of Source, Grid, L...

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System Simulation Technology and its Application (CCSSTA), IEEE China Conference on

作者： Man Wang Chunjie Wang Xiangyu Kong Haoyang Yao Yuan Niu Chao Wang Tianjin Key Laboratory of New Energy Power Conversion Transmission and Intelligent Control Tianjin University of Technology Tianjin China Key Laboratory of Smart Grid Tianjin University Tianjin China State Grid Tianjin Electric Power Company Ninghe Power Supply Branch Tianjin China

ISBN: (数字)9798350366600

ISBN: (纸本)9798350366617

As the scale of grid connection of renewable resources such as wind and solar continues to increase, it is difficult to meet system needs by relying solely on the existing single fast peak-shaving power source. Therefore, this paper aims at the power system scheduling problem under different photovoltaic penetration rates. First, the multi-dimensional characteristics of photovoltaics are modeled. Then, a system scheduling model for the interaction of four types of resources: conventional units, grid elasticity, load response, and energy storage is established. Finally, to minimize the system peak-shaving cost, the optimal system scheduling strategy under different photovoltaic penetration rates is obtained, and the dynamic matching of different photovoltaic penetration rates with the peak-shaving capacity of the power system is completed. A system scheduling strategy that can meet different photovoltaic penetration rates is proposed to ensure the power system’s balance of supply and demand and improve resource utilization.

关键词： Photovoltaic systems Wind Renewable energy sources Supply and demand Power system dynamics Optimal scheduling Dynamic scheduling Systems simulation Resource management Load modeling

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Ultra-short-term forecasting method of demand-side resource response transaction scale based on GAT-Transformer

Ultra-short-term forecasting method of demand-side resource ...

引用

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

作者： Haohui Zeng Ziteng Liu Jianli Zhao Zhenlan Dou Cheng Li Ruping Shao College of Electrical Engineering and Control Science Nanjing Tech University Nanjing China Shanghai Key Laboratory of Smart Grid Demand Response State Grid Shanghai Electric Power Company Shanghai China State Grid Shanghai Municipal Electric Power Company State Grid Shanghai Electric Power Company Shanghai China

ISBN: (数字)9798331523527

ISBN: (纸本)9798331523534

With the transformation from "source-load interaction" to "source-load interaction," demand-side resources can improve the flexibility of power grid and promote the efficient use of clean energy by participating in power grid regulation. Due to the wide variety and different characteristics of demand side resources, the management of demand side is becoming more and more important. The accuracy of demand side resource transaction scale measurement is one of the keys to improve the resilience of power grid. In order to solve this problem, this study proposes an ultra-short-term forecasting method of demand-side resource response transaction scale based on GAT-Transformer. Firstly, the demand side resource transaction data and meteorological data are input into the GAT network, and the graph feature representation is extracted. Secondly, the feature representation is enhanced by combining category labeling and location embedding, and the dropout operation is applied to reduce the risk of overfitting. Finally, the Transformer module is used to further process the enhanced features, and the Multi-Layer Perceptron ( MLP ) is used to classify and output the final results. The experimental results show that compared with other prediction methods, the prediction results of this method are at least 0.232 lower in RMSE, 0.247 lower in MAE and 5.702 lower in MAPE.

关键词： Accuracy Power measurement System integration Predictive models Feature extraction Transformers Power grids Regulation Forecasting Resilience

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Research on Secure Data Circulation and Sharing protection Technology Framework for Power Monitoring System

Research on Secure Data Circulation and Sharing Protection T...

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International Conference on Networking and Network Applications (NaNA)

作者： Weicong Huang Jieying Zhou Minghui Jin Zheng Han Sijia Wei State Grid Laboratory of Power cyber-Security Protection and Monitoring Technology State Grid Smart Grid Research Institute Co. LTD. Nanjing China National Power Dispatching and Control Center State Grid Corporation of China Beijing China State Grid Shanghai Municipal Electric Power Company Shanghai China

With the increasing frequency of data circulation and sharing in power monitoring systems, traditional network-centric protection strategies are insufficient to resist the growing risk of data leakage. This article analyzes the security risks in existing typical data circulation and sharing scenarios based on the demand for data security sharing in power monitoring systems. A data security protection technology framework covering the source layer, interaction layer, and terminal layer has been proposed from the perspectives of basic protection capabilities and key protection technologies, as well as an evaluation method for the protection technology capabilities of data circulation and sharing. This provides a reference idea for effectively enhancing the data circulation and sharing protection capabilities of power monitoring systems.

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Analysis of action mechanism of positive sequence fault component directional element considering energy storage access

Analysis of action mechanism of positive sequence fault comp...

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IEEE Asia Power and Energy Engineering Conference (APEEC)

作者： Feng Xue Jiawei He Bin Li Rui Mu Cheng Yao Yongwu Zhang Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China Electric Power Research Institute State Grid Tianjin Electric Power Company Tianjin China Electric Power Dispatching and Control Center State Grid Tianjin Electric Power Company Tianjin China

ISBN: (数字)9798350373479

ISBN: (纸本)9798350373486

When the energy storage system is connected to the AC distribution network, the action characteristics of the fault component direction element are different from other new energy systems due to its special control strategies and working modes. Under the same fault condition, the different charging and discharging modes of the energy storage system will lead to different operating characteristics of the positive sequence fault component direction element. Based on the control strategies and working modes of the energy storage system, this paper focuses on the phasor characteristics of the positive sequence voltage and current before and after the symmetrical fault of the AC side line connected to the energy storage system, and analyzes the action mechanism of the positive sequence fault component direction element. Finally, the correctness of the theoretical analysis is verified by PSCAD simulation.

关键词： Lead acid batteries Electrical engineering Reactive power Simulation Asia Distribution networks Fault location

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