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Data-Driven Early Warning for Dynamic Insecurity Risk of Hybrid AC/DC power Grids

Data-Driven Early Warning for Dynamic Insecurity Risk of Hyb...

引用

International Conference on power system Technology (powerCON)

作者： Jiongcheng Yan Changgang Li Yutian Liu Yuanzhen Zhu Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China Electric Power Research Institute of State Grid Shandong Electric Power Company Jinan China

The dynamic interactions between AC and DC systems and the uncertainty of renewable generation increase the risk of cascading failures and bring challenges for the secure operation of hybrid AC/DC grids. Insecurity early warning identifies the security risk and guides the control decision-making, which is important for the secure power system operation. To achieve fast insecurity early warning, a data-driven early warning method for dynamic insecurity risk is proposed in this paper. First, Latin hypercube sampling and improved K-medoids algorithm are utilized to generate typical operating conditions (OCs) in the future. Then, stacking denoising autoencoders and ensemble extreme learning machines are deployed to construct security risk assessment models to fast assess the dynamic security of typical OCs. And model update is performed to ensure the assessment accuracy when cascading failures occur. Finally, the insecure OCs are ranked into different insecure levels based on the control cost needed to ensure the system security. simulation results of the Northwest hybrid AC/DC grid in China demonstrate that the proposed method can achieve fast insecurity early warning and effectively track the security risk tendency during the process of cascading failures.

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Reliability Evaluation of a Regional Integrated Energy system Based on Complex Network Theory

Reliability Evaluation of a Regional Integrated Energy Syste...

引用

2021 IEEE Sustainable power and Energy Conference, iSPEC 2021

作者： Li, Jifeng Song, Kuizheng He, Xingtang Luo, Hao State Grid Liaoning Electric Power Supply Co. Ltd Dalian Electric Power Supply Company Dalian China State Grid Liaoning Electric Power Supply Co. Ltd Dispatching and Control Center Shenyang China Tianjin University Key Laboratory of the Ministry of Education on Smart Power Grids Tianjin China Northeast Electric Power University Key Laboratory of Modern Power System Simulation and Control Renewable Energy Technology Jilin China

ISBN: (纸本)9781665414395

Most of the methods currently used to evaluate the reliability of integrated energy supply mainly consider such systems on a microgrid scale and focus on the effects of interactions among various energy carriers on the overall energy supply reliability of the system. As a result, it is difficult to analyze the system reliability in terms of its topology. Therefore, this paper proposes an approach for evaluating the reliability of a regional integrated energy system based on complex network theory. First, the feasibility of complex network theory application was analyzed based on the structural framework of the regional integrated energy system. Then, a weighted complex network model containing network characteristics was constructed by improving the 'distance' parameter in the complex network theory. Employing this model enabled the proposal of reliability evaluation indices, including nodes and the entire system, from the perspective of the system network topology. Finally, the effectiveness and applicability of the developed method were verified by constructing a test system. The application of complex network theory for reliability evaluations of regional integrated energy systems described in this paper provides guidance for planning and constructing future systems at the level of topology reliability. © 2021 IEEE.

关键词： Complex networks

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An Improved Shrunken Primal-Dual Subgradient (i-SPDS) algorithm for Optimization in Large-Scale Networked Environment 2

An Improved Shrunken Primal-Dual Subgradient (i-SPDS) algori...

引用

2020 2nd International Conference on Energy, power, Environment and Computer Application, ICEPECA 2020

作者： Luo, Kui Wang, Qinghua State Key Laboratory of Operation and Control of Renewable Energy and Storage System China Electric Power Research Institute Beijing100192 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing102206 China

Large-scale optimization in networked environment is challenged by scalability. To address this challenge, this paper sets its aim on developing algorithms for optimization problems with strongly coupled objective function and global constraints. As a radical improvement of the state-of-the-art algorithms, this paper develops an improved shrunken-primal-dual subgradient (i-SPDS) algorithm that establishes fast convergence and eliminates optimality gap. The developed algorithm is rather generic in that it can be readily implemented in any applications that involve large-scale networked environment. simulations are conducted to demonstrate the efficacy and efficiency of the proposed i-SPDS. © Published under licence by IOP Publishing Ltd.

关键词： Energy resources

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Construction and Applications of Knowledge Graph of Relay Protection Device Defects Based On Ne04J and Structured Data

Construction and Applications of Knowledge Graph of Relay Pr...

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International Conference on Advanced power system Automation and Protection (APAP)

作者： Shaoming Zheng Peng Dong Juan Du Dan Liu Hongzhi Su Shuhong Wang Chang Tao Jinzhou Yang Ancheng Xue China Power Dispatching and Control Centre China Beijing China State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing China

The defect data of relay protection device contains rich operation and maintenance management information that needs to be excavated, and its effective utilization is of great significance for improving the reliability of relay protection system operation. This paper constructs a knowledge graph based on Neo4j for the structured data of relay protection device defect records, and implements the related applications, and completes the information mining work. Specifically, firstly, the powerful data retrieval and screening function based on Neo4j knowledge graph is explained from the basic theory; secondly, the structured data is divided into corresponding nodes and attribute relations according to the construction logic graph, and the Neo4j-based knowledge graph is formed; finally, the nodes and attributes matching method is adopted to traverse and retrieve the structured data knowledge graph, and the online query of defect type and statistical analysis of equipment performance of each manufacturer are realized.

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LVRT During-fault-stage Equilibrium Point is Unnecessary for Renewable Grid-tied systems

LVRT During-fault-stage Equilibrium Point is Unnecessary for...

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power system and Green Energy Conference (PSGEC)

作者： Yayao Zhang Min Cheng Meng Zhan Jiawei Yu Yihua Zhu Mingkang Wu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China Yunnan Power Grid China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid China National Energy Power Grid Technology R&D Centre Electric Power Research Institute China Southern Power Grid China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Electric Power Research Institute China Southern Power Grid China

ISBN: (数字)9798350365573

ISBN: (纸本)9798350365580

Transient synchronous stability of renewable grid- tied systems is of paramount importance. Most of previous studies focused on the grid-tied converter in the low voltage ride through (LVRT) during-fault stage and performed stability analysis based on the belief that if the system has (or has no) a stable equilibrium point in the during-fault stage, the system will be stable (or unstable). Therefore, it has been broadly accepted that the existence and/or stability of equilibrium point in the during-fault stage is necessary. However, the whole LVRT contains four different stages and the during-fault stage is only one among them. The transient synchronous stability of whole system should be determined by the initial state in the late post-fault stage and the attraction basin of its equilibrium point. The late post-fault stage is essential for stability and all four stages are important. Clearly treating the during-fault stage as the whole LVRT stages makes the nonlinear switched dynamics problem be greatly simplified and, certainly, is incomplete. In order to clarify this point, this paper analyzes the influence of existence (or nonexistence) of equilibrium point in the during-fault stage on the transient synchronous stability of permanent magnet synchronous generator grid-tied system. We can find that the existence of an equilibrium point in the during-fault stage is only a sufficient condition, rather than a necessary condition. The theoretical analysis is also verified in the hardware-in-the-loop experiment Therefore, a large number of previous studies and results on the transient synchronous stability of renewable grid-tied systems are incomplete and questionable.

关键词： Sufficient conditions Stability criteria Switches Voltage power system stability Synchronous generators Permanent magnets Nonlinear dynamical systems Transient analysis Magnetic switching

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Research on load demand response behavior strategies in the steel industry guided by price signals

Research on load demand response behavior strategies in the ...

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4th Energy Conversion and Economics Annual Forum (ECE Forum 2024)

作者： Junhui Li Jiong Zhang Yan Li Peng Yu Meng Yu Hengyu Liu Xingxu Zhu Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin People's Republic of China State Grid Electric Power Research Institute Co. Ltd State Grid Electric Power Research Institute Wuhan Efficiency Evaluation Co. Ltd Hubei People's Republic of China State Grid Liaoning Electric Power Co. Ltd State Grid Liaoning Electric Power Company Limited Power Dispatch and Control Center Liaoning People's Republic of China State Grid Liaoning Electric Power Co. Ltd State Grid Liaoning Electric Power Company Limited Electric Power Research Institute Liaoning People's Republic of China

ISBN: (数字)9781837242924

The steel industry load has the advantages of high power consumption, high automation level, strong controllability, and strong demand response potential. In order to improve its enthusiasm for participating in the power grid and promote the consumption of renewable energy, the electricity response behavior and demand potential of each production process of the industrial load are first evaluated. The strategy of using price signals to guide the steel industry load in typical areas to participate in the demand response of the power system is proposed. Models are established for the power grid dispatch center and the industrial load response behavior respectively. In the process, the different interests and demands of the two parties, the power grid dispat ch and the industrial load, are comprehensively considered. A two-layer dispatch model is established to truly reflect the interactive game process between power supply and demand; To match the model solution with interaction, a hierarchical iterative algorithm is used to accelerate the convergence speed while ensuring the interaction between price signals and purchasing power between layers. Combining a certain industrial load area for case analysis, the results show that the proposed model not only improves the system's ability to absorb renewable energy, but also takes into account the interests and responsiveness of the steel industry load.

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Energy Storage Participation in Peak Shaving Market Operation Strategy Based on system Supply and Demand Margin

Energy Storage Participation in Peak Shaving Market Operatio...

引用

China International Conference on Electricity Distribution, CICED

作者： Houyu Qi Haibo Zhang Songtao Huang Guozheng Shang Rui Duan State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing Beijing China Dispatching Control Center State Grid Inner Mongolia Eastern Electric Power Co. Ltd. Hohhot China

ISBN: (数字)9798350368345

ISBN: (纸本)9798350368352

Existing energy storage operation strategies take renewable energy unit consumption as the main goal, and often operate in conjunction with renewable energy projects, resulting in low energy storage utilization rate and insufficient driving force for energy storage operators to develop independent energy storage. However, with the implementation of independent energy storage operation support policies, the regional peak shaving service market gradually expands to include energy storage. Energy storage can have a positive impact on the economy of the power system as well as its utilization rate. According to the historical East Inner Mongolia power Grid operational data, this paper established the annual chronological operation simulation model of peak shaving market participation by energy storage. By analyzing and summarizing the results of energy storage operation state obtained from the annual operation simulation, the energy storage operation strategy of taking part in peak shaving market based on system supply and demand margin was proposed. The two charge and two discharge or three charge and two discharge strategy, which are the most common operation modes of operation simulation, are compared with the proposed operation strategy. It is evident that energy storage's involvement in system peak shaving can lessen thermal units' peak shaving pressure, enhance the benefits of energy storage as a market participant for auxiliary services and the system's overall efficiency in terms of electricity consumption.

关键词： Renewable energy sources Supply and demand Electricity Force Discharges (electric) power grids Data models Energy storage

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Load Regulation Strategies of Solid Oxide Electrolysis system Coupled with External Heat Sources

Load Regulation Strategies of Solid Oxide Electrolysis Syste...

引用

243rd ECS Meeting

作者： Cui, Tonghui Han, Minfang Ni, Meng Fuel Cell and Energy Storage Center Department of Energy and Power Engineering State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing100084 China Tsinghua Innovation Center in Guangdong Dongguan523808 China Department of Building and Real Estate Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong

ISBN: (纸本)9781607685395

Solid oxide electrolysis system requires electrical and thermal energy. Five scenarios are defined according to various cases of external heat sources coupling and electrical energy sources. Three methods are proposed to track variations in electrical or thermal load, including constant flow rate (F method), constant steam utilization (Us method) and constant cell operating voltage (V method). Through system process simulation, the applicability of three methods in different scenarios is explored to obtain load regulation strategies. In the scenario coupled with low-temperature heat and intermittent power and the scenario with no heat coupling, the F method is preferred at high loads and the V method is preferred at low loads, while it is the opposite in the scenario coupled with high-temperature heat and intermittent power. The V method is preferred at low loads in the scenario coupled with low-temperature heat and high loads in the scenario coupled with high-temperature heat. © The Electrochemical Society.

关键词： Temperature

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Transient Voltage Analysis for Hybrid Grid-Following and Grid-Forming Converters

Transient Voltage Analysis for Hybrid Grid-Following and Gri...

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IEEE Asia power and Energy Engineering Conference (APEEC)

作者： Xindi Liu Shanshan Qiu Changhui Ma Xing Lei Xinyu Wei Changgang Li Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China State Grid Shandong Electric Power Research Institute Shandong Smart Grid Technology Innovation Center Jinan China State Grid Shanghai Municipal Electric Power Company Shanghai China

ISBN: (数字)9798331517540

ISBN: (纸本)9798331517557

With the integration of power electronic devices, the dynamic characteristics of power system have become increasingly complex. Renewable energy units are integrated into the grid through grid-following (GFL) and grid-forming (GFM) converters. In order to reveal the impact of hybrid GFL and GFM converters on transient voltage in renewable energy base, this paper analyzes the terminal voltage characteristics. Firstly, this paper simplifies the renewable energy base and proposes a formula for calculating terminal voltage. Next, this paper analyzes the impact of GFL converter parameters, GFM converter parameters, and the capacity ratio of GFL to GFM converters on terminal voltage. Then, we propose a calculation formula for the capacity configuration ratio of GFM converters in renewable energy bases. Finally, the theoretical analysis in this paper is verified.

关键词： Electrical engineering Renewable energy sources Grid following power system dynamics Voltage power electronics Topology Transient analysis Voltage control Grid forming

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AC Network-Constrained Local Electricity Market Mechanism in Low-voltage Distribution Networks

AC Network-Constrained Local Electricity Market Mechanism in...

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2022 IEEE power and Energy Society General Meeting, PESGM 2022

作者： Yang, Jiajia Yan, Gangui Yang, Yulong Chen, Guo Li, Chaojie Wen, Fushuan Northeast Electric Power University Ministry of Education Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Jilin132012 China School of Electrical Engineering and Telecommunications University of New South Wales SydneyNSW2052 Australia School of Electrical Engineering Zhejiang University Hangzhou China Tallinn University of Technology Department of Electrical Power Engineering and Mechatronics Estonia

ISBN: (数字)9781665408233

ISBN: (纸本)9781665408233

This paper proposes a fully decentralized local electricity market mechanism backboned by a modified version of the Alternating Direction Method of Multipliers (ADMM). Comparing with the state-of-the-art peer-to-peer (P2P) market in local distribution systems, the proposed electricity trading mechanism comprehensively incorporates power network constraints formulated by an Alternating Current (AC) power flow model. In the proposed method, nodal voltages are designed as the only public variables shared among participants. Privacy of each participant is thus sufficiently preserved without exposing the bid data to the others. Meanwhile, the proposed method can also ensure the global optimality of social welfare in electricity transactions. Comprehensive case studies on the IEEE 33-node distribution system are conducted to demonstrate the feasibility and effectiveness of the proposed electricity trading mechanism. © 2022 IEEE.

关键词： power markets

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