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SSRN 2024年

作者： Wang, Kang Wang, Chengfu Dong, Xiaoming Yao, Wenliang Zhang, Zhenwei Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Shandong Province Jinan250061 China Shandong University China

The efficient utilization of integrated demand response (IDR) is substantially hindered by the centralized pattern of IDR management, which constrains the potential of IDR to enhance system flexibility and maintain the balance between power supply and demand. In this pattern, the integrated energy operator (IEO) acquires IDR resources from integrated load aggregators (ILAs), while the demand response transactions among ILAs, treated as a unique commodity, lack adequate attention. Therefore, it is imperative to utilize IDR resources in decentralized manner and facilitate the synergy between IEO and ILAs. To this end, a cooperative demand response management (DRM) framework for integrated energy system (IES) is proposed. Firstly, peer-to-peer (P2P) transaction is integrated with demand response exchange (DRX) mechanism to design decentralized market for DR transaction. Meanwhile, Nash bargaining theory and alternating direction method of multipliers (ADMM) algorithm are applied to achieve the optimal allocation of interests and preservation of privacy, respectively. Secondly, the price elasticity matrix of gas-electricity, which depicts cross-price elasticity of natural gas demand with respect to electricity in retail market and vice versa, is introduced to furtherly exploit the flexibility of the demand side resource. Thirdly, the cooperative DRM framework is established, where the P2P market synergizes with the traditional retail market to foster the efficient utilization of IDR resources. Case study demonstrate that the proposed DRM framework effectively facilitates a win-win situation between the ILAs and IEO to harness the potential of IDR. © 2024, The Authors. All rights reserved.

关键词： Electric loads

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controlled power system Separation Using Generator PMU Data and system Kinetic Energy

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IEEE TRANSACTIONS ON power DELIVERY 2023年第4期38卷 2618-2629页

作者： Tyuryukanov, Ilya Bos, Jorrit A. A. van der Meijden, Mart A. M. M. Terzija, Vladimir Popov, Marjan Delft Univ Technol NL-2628 CD Delft Netherlands Siemens Energy AG D-91058 Erlangen Germany TenneT TSO BV NL-6812 AR Arnhem Netherlands Shandong Univ Sch Elect Engn Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Peoples R China

With the growing number of severe system disturbances and blackouts around the world, controlled system separation is becoming an increasingly important system integrity protection scheme (SIPS) to save the electric power system from a complete or partial disintegration. A successful controlled splitting approach should at least tackle the following two well-known and interrelated problems: "when to split?" and "where to split?". Multiple previous publications consider these problems separately, and even those pursuing a combined approach propose solutions with limited applicability. In this article, we are proposing a novel PMU-based detector of loss of synchronism that utilizes generator PMU data to promptly detect rotor angle instabilities over a wide area. Moreover, we are showing how our loss of synchronism detection principle can be coupled with the known controlled splitting techniques to form an integrated defense scheme against unintentional loss of synchronism. The performance of this wide-area SIPS is demonstrated on the IEEE 39-bus test power system for various types of unstable conditions.

关键词： controlled islanding energy function out-of-step (OOS) protection phasor measurement unit (PMU) rotor angle stability transient stability

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power Differential Protection for Transformer Based on Fault Component Network

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IEEE TRANSACTIONS ON power DELIVERY 2023年第4期38卷 2464-2477页

作者： Peng, Fang Gao, Houlei Huang, Jiakai Guo, Yifei Liu, Yiqing Zhang, Yongfeng Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Peoples R China State Grid Tianjin Elect Power Co Elect Power Res Inst Tianjin 300384 Peoples R China Univ Aberdeen Sch Engn Aberdeen AB24 3UE Scotland Univ Jinan Sch Elect Engn Jinan 250022 Peoples R China

Current differential protection has been widely used as the primary protection of transformers. However, inrush currents during transformer energization can cause misoperation of the protection when the second harmonic restraint algorithm fails. This article proposes a power differential protection scheme based on the fault component network (FCN), which is free from inrush detection and computationally cheap. First, the fault component differential power (FCDP), defined as the differential active power of a transformer in the FCN, is analyzed under different conditions. Second, a transformer protection scheme is presented based on the FCDP and the traditional differential power. A removal algorithm of decaying direct current (DDC) offset is developed to accurately estimate the FCDP. The performance of the scheme is tested under various conditions, including internal faults, external faults and transformer energization. The simulations using PSCAD and Real Time Digital Simulator (RTDS), experiments in the Electrical power Dynamic laboratory (EPDL) and real recording data validate that the proposed method can protect the transformer reliably.

关键词： Current differential protection fault component magnetizing inrush power differential protection power transformer

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Design and Application of Wideband Monitoring Master Station in power systems

Design and Application of Wideband Monitoring Master Station...

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Energy, Electrical and power Engineering (CEEPE), International Conference on

作者： Yiming Zeng Fang Shi Hengxu Zhang Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan China

The use of power electronics to integrate increasing renewable energy resources into power grids has changed the wideband characteristic of the power system signals. The traditional wide-area measurement system (WAMS) based on synchronized phasor measurement unit (PMU) can only measure the fundamental frequency component, making it unable to meet the measurement requirements of harmonics and interharmonic components. To address this problem, the wideband synchronized measurement unit (WPMU) has been developed, which supports real-time measurement of harmonic and interharmonic components, in addition to the functionalities of PMU. As a result, upgrading the WAMS master station is necessary to make the integration of wideband measurement available. This paper analyzes the characteristics of wideband measurement data, explores its practical applications and discusses the idea of upgrading the WAMS master station for wideband measurement, including designing its data transmission architecture, selecting a suitable database, and outlining advanced application methods. Finally, the paper presents the analysis of one actual engineering application, where the wideband measurement devices are installed, and the data is sent to the master station in real time. This work provides a reference for the design and development of a wideband WAMS master station, and contributes to the safety and stability of the power grid operation by providing wideband measurement information.

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Three-Phase Unbalanced Distribution Network Dynamic Reconfiguration: A Distributionally Robust Approach

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IEEE TRANSACTIONS ON SMART GRID 2022年第3期13卷 2063-2074页

作者： Zhou, Anping Zhai, Hefeng Yang, Ming Lin, You Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Peoples R China Elect Power Res Inst China Southern Power Grid Syst Inst Guangzhou 510663 Peoples R China Southern Methodist Univ Dept Elect & Comp Engn Dallas TX 75205 USA

The active distribution network has witnessed an increasing penetration of distributed generation (DG) while the stochasticity and variability arising from DGs also impose significant challenges on system operation. To mightily accommodate the uncertainty of DG, we introduce a distributionally robust chance-constrained dynamic reconfiguration approach for a three-phase unbalanced distribution network. The proposed framework optimizes the switching cost and the expected power supply cost from upstream grid, and stipulates that the chance constraints hold under the worst-case distribution within a novel ambiguity set, which incorporates the Wasserstein distance and the first-order moment. Then we develop tractable and scalable solution methods to tackle the expected objective function and chance constraints. As a result, the proposed model is reduced to a mixed-integer linear programming problem that can readily be implemented. Numerical experiments are carried out on the IEEE 34-bus and 123-bus test systems to demonstrate the effectiveness and efficiency of the suggested approach.

关键词： Costs Switches Uncertainty Substations Optimization Distribution networks Mathematical models Chance-constrained optimization distributed generation distributionally robust optimization dynamic reconfiguration unbalanced distribution network

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Inertial security region estimation and analysis of new power systems considering renewable energy virtual inertial

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ENERGY REPORTS 2023年 9卷 1836-1849页

作者： Zhou, Tao Huang, Ju Quan, Hao Xu, Yan Liu, Zicheng Nanjing Univ Sci & Technol Sch Automat Nanjing 210094 Peoples R China Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Peoples R China Jiangsu Frontier Elect Technol Co Ltd Prod Technol Res & Dev Ctr Nanjing 211100 Peoples R China

With the proposal of "double carbon strategy" and new power system construction, the increasing proportion of renewable energy sources and the wide access of power line sub-devices, the inertia support capacity of the power grid is gradually weakened and shows low inertia characteristics, which seriously threatens the system operation safety and frequency stability. In order to comprehensively grasp the operation status of the new power system and ensure its frequency stability, this paper proposes a renewable energy virtual control theory based on the established frequency response model of new power systems considering multiple inertial resources. Secondly, the inertial safety region (ISR) of the new power system considering the virtual inertia and frequency regulation capability of renewable energy is proposed to determine the frequency stability boundary, and its estimation method and procedure are introduced in detail. Finally, a case study and analysis are conducted in the New England system with actual operational data to verify the feasibility and effectiveness of the proposed method. The simulation results show that the method can effectively identify the ISR of the new power system and analyze the mechanism of the influence of renewable energy on ISR, and relevant conclusions are drawn from the simulation results. (c) 2023 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://***/licenses/by-nc-nd/4.0/).

关键词： New power system Low-inertia characteristic Inertia security region Frequency stability Virtual inertia control

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Multi-dimensional Visualization Method of SCD File Information of intelligent Substation Based on Knowledge Graph

Multi-dimensional Visualization Method of SCD File Informati...

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Energy, Electrical and power Engineering (CEEPE), International Conference on

作者： Feng Wang Yiquan Li Qian Tan Ziliang Wu Jianglei Suo Qianshuo Gu Power Dispatching Control Center Guangdong Power Guangzhou China Key Laboratory of Power System Intelligent Dispatch and Control Shangdong University Jinan China

The structure of intelligent substation SCD file is complex, and there are many layers of information. Different functions have corresponding information basis, and often need to be associated across multiple information nodes, resulting in poor visualization. This paper presents a multi-dimensional visualization method of SCD file information of smart substation based on knowledge graph. Firstly, the file structure and function structure of SCD text expression are analyzed. Then the SCD file node is extended and the seven-step method is adopted to construct the intelligent substation ontology, which is realized by Protégé. The knowledge graph of substation is constructed by using ontology and relationship between SCD nodes. The graph expression of SCD is completed, and the visualization of file structure information is realized. The information path of functions such as the correlation between primary and secondary devices and the correlation between virtual and real circuits is mined. The information nodes in the path are searched in the SCD knowledge graph to realize the visualization of functional structure information. The above work was done through Neoj4, Python. The simulation results show that knowledge graph can decouple SCD information and realize multi-dimensional visualization of information with a high degree of visualization, which can provide guidance for operation and maintenance and information retrieval.

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An Approach for Configuring Thermal Storage Capacity of Concentrated Solar power Considering Low-Carbon Economic dispatch

An Approach for Configuring Thermal Storage Capacity of Conc...

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International Conference on power system Technology (powerCON)

作者： Nuo Xu Xiaodong Chu Hua Ye Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan R.R. China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan P.R. China

Concentrated Solar power (CSP) has gradually become an emerging development direction in the clean energy area because of its high energy efficiency, renewable and abundant nature. Thermal storage devices are used to regulate the power generation characteristics of CSP plants, and a rational configuration of thermal storage capacity can effectively reduce the system's carbon footprint. Considering the generation cost of thermal power generators, operation and maintenance cost of CSP plants, and system spinning reserve cost, a low-carbon economic dispatch scheme for power systems including CSP plants that takes carbon trading into account is proposed in this paper. On this basis, a thermal storage capacity allocation method for CSP plants is proposed, taking into account the thermal storage cost and dispatching cost. Additionally, simulation verification is performed on IEEE 30 network, and the findings demonstrate that the designed thermal storage capacity configuration strategy effectively reduces carbon emissions and overall system costs.

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Impact of Hybrid Grid-Following and Grid-Forming Converters on Post-Fault Overvoltage in Renewable Energy Base

Impact of Hybrid Grid-Following and Grid-Forming Converters ...

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

作者： Xindi Liu Jiawen Cao Dongbao Lv Changgang Li Shanshan Wang Jingya Jiang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China China Electric Power Research Institute Beijing China

ISBN: (数字)9798331523527

ISBN: (纸本)9798331523534

With the integration of renewable energy and power electronic devices, the dynamic characteristics of the power system have become increasingly complex. In order to reveal the post-fault overvoltage mechanism of hybrid grid-following converter (GFL) and grid-forming converter (GFM) systems, this paper analyzes the terminal voltage characteristics among different systems using phasor diagram. Firstly, this paper introduces GFL model and analyzes the terminal voltage in GFL grid-connected system. Next, this paper analyzes hybrid GFL and GFM system, pointing out that GFM can provide voltage support during short-circuit faults, and reduce post-fault overvoltage. Then, the paper discusses the impact of the capacity ratio of GFL to GFM on terminal voltage. Finally, the theoretical analysis in this paper has been verified in different systems.

关键词： Renewable energy sources Grid following power system dynamics Voltage system integration power system stability Stability analysis Topology Voltage control Grid forming

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A Data Storage Method of intelligent Substation Based on Physical Model

A Data Storage Method of Intelligent Substation Based on Phy...

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power Energy systems and Applications (ICoPESA), International Conference on

作者： Shidan Liu Qian Tan Jianglei Suo Xiaowa Chen Shaolin Jiao Feng Wang Yiquan Li Qianshuo Gu Power Dispatching Control Center Guangdong Power Guangzhou China Key Laboratory of Power System Intelligent Dispatch and Control Shangdong University Jinan China

In view of the sharp increase in the amount of data in intelligent substations at present, the gap between the data transmission mode and the data storage mode is large, resulting in the problem of low data storage efficiency. This paper presents a data storage method of intelligent substation based on physical model. Firstly, this paper analyzes the data transmission mode of IEC 61850, introduces the object-oriented modeling technology of IEC 61850, the relationship between various configuration files, and the tree structure of the transmitted data. Then, this paper introduces the concept, structure and characteristics of the physical model. Build a physical model of the device based on the CID (Configured IED Description) file of the device, and form a device self-describing JSON file. After then, according to the characteristics of each service in the physical model, this paper uses different types of databases to store the data under this service. Finally, this paper develops and applies the method, and completes the back-to-back data storage model of a substation equipment. The experimental results show that the functional requirements and performance indicators of the developed substation data storage method can achieve the desired goals and effectively improve the efficiency of data storage.

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