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检索条件"机构=the Key Laboratory of Power System Intelligent Dispatch and Control"

共 1153 条记录，以下是221-230 订阅

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Sequential power Flow Calculation for AC/DC Hybrid systems with Multi-terminal LCC-HVDC

Sequential Power Flow Calculation for AC/DC Hybrid Systems w...

引用

IEEE Asia power and Energy Engineering Conference (APEEC)

作者： Peng Wang Ruiyang Su Jian Wang Hang Qi Runjia Sun Changgang Li Hefeng Zhai Baoye Tian Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China State Key Laboratory of HVDC Electric Power Research Institute CSG Guangzhou China

ISBN: (数字)9798350373479

ISBN: (纸本)9798350373486

Line Commutated Converter based-high voltage direct current (LCC-HVDC) systems are an important support for large-scale renewable energy transmission. Compared with two-terminal LCC-HVDC, multi-terminal LCC-HVDC systems are flexible in control and reliable in power supply. However, the integration of multi-terminal LCC-HVDC brings great complexity to the operation modes and power flow of power systems. Therefore, it is very important to resolve the power flow calculation problems of AC/DC hybrid systems containing multi-terminal LCC-HVDC. This paper proposed a sequential power flow calculation algorithm for multi-terminal LCC-HVDC. Firstly, a steady-state model of multi-terminal LCC-HVDC was proposed considering control modes. Secondly, based on the steady-state model, a power flow calculation algorithm for AC/DC hybrid power systems containing multi-terminal LCC-HVDC is designed with sequential iteration methods. Finally, two cases with two-terminal and three terminal LCC-HVDC are tested to verify the accuracy of the proposed model and algorithm.

关键词： Electrical engineering Renewable energy sources power supplies Energy resolution Hybrid power systems Steady-state power system reliability

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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...

引用

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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Adaptive Internal Time-Step Adjustment of Elementary Transfer Function Blocks for Trapezoidal Integration in power system Dynamic Simulations

Adaptive Internal Time-Step Adjustment of Elementary Transfe...

引用

International Conference on power system Technology (powerCON)

作者： Yun Hang Changgang Li Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan Shandong China

With the development of renewable energy sources, the scale and complexity of power systems are continuously increasing, resulting in a high requirement for the efficiency of dynamic simulation. To enhance the overall simulation speed, this paper proposes an adaptive internal time-step adjustment method of elementary transfer function blocks for Trapezoidal integration in power system dynamic simulations. For blocks with different time constants, three integration modes are defined, including single-step integration, multiple-step integration, and static approximation. Each block can select an appropriate integration mode and adaptively adjust its internal time-step. Implementation of static approximation for blocks with small time constants is given. The proposed method is applied to the open-source Simulation Toolkit for Electrical power systems (STEPS). The IEEE 9-bus test system is tested to obtain the maximum simulation time-step that can maintain numerical stability and validate the efficiency of the proposed method.

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A power supply restoration method of distribution network based on NSGA-II algorithm 3

A power supply restoration method of distribution network ba...

引用

3rd International Academic Exchange Conference on Science and Technology Innovation, IAECST 2021

作者： Zhou, Fengyuan Gao, Zhanjun Mu, Jinshuang Zong, Peng Ministry of Education Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Jinan China

ISBN: (纸本)9781665402675

With the rapid development of today's economy and society, people put forward higher requirements for power quality. In the process of distribution network operation, if there is a fault, it will produce immeasurable loss. It is necessary to restore the power supply in the non-fault power outage area in time. Therefore, it is particularly important to restore the power supply of distribution network quickly and efficiently. This paper considers factors such as load recovery, switching operation times and network loss. Based on the mathematical model of distribution network restoration and reconstruction, a genetic algorithm for distribution network power supply restoration and reconstruction is proposed. Combined with the characteristics of distribution network, the crossover rate and mutation rate suitable for distribution network are selected to improve the efficiency of the algorithm and make it quickly converge to the global optimal solution. Finally, the feasibility of distribution network is verified by an example. © 2021 IEEE.

关键词： Genetic algorithms

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Transient Overvoltage Analysis in Large-Scale Wind power Sending End systems with Grid-Following and Grid-Forming Converters

Transient Overvoltage Analysis in Large-Scale Wind Power Sen...

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

作者： Jiawen Cao Xindi Liu 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

As China pursues its "carbon peak" and "carbon neutrality" goals, the rapid growth of renewable energy has raised concerns about grid stability due to transient overvoltage. The overvoltage can exceed protective settings, leading to disconnections of renewable sources. This paper investigates the mechanisms behind transient overvoltage in a large-scale radial wind power integration system following a three-phase short-circuit fault. By modeling a large-scale wind power sending end system with both grid-following (GFL) and grid-forming (GFM) converters, the study analyzes turbine dynamics and quantifies transient overvoltage. The research also examines the factors influencing overvoltage, providing a theoretical foundation for overvoltage protection in wind power systems.

关键词： Renewable energy sources Analytical models Grid following Wind power generation power system stability Stability analysis Wind turbines Voltage control Transient analysis Grid forming

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Cascading Failures Assessment with High Penetration of DFIG Based Wind Turbines

Cascading Failures Assessment with High Penetration of DFIG ...

引用

2021 IEEE Sustainable power and Energy Conference, iSPEC 2021

作者： Liu, Tianhao Zhu, Yuanzhen Sun, Runjia Liu, Yutian Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Jinan China

ISBN: (纸本)9781665414395

An assessment method of cascading failure is proposed to acquire high-risk cascading failures chains under high penetration of renewable energy power system. At first, a dynamic simulation model considering the controller of DFIG is established, and the simplified LVRT model is proposed for the DFIG response model. Then, a risk index is defined for the depth first tree search method used in searching proceeding. Finally, a searching method for cascading failure based on dynamic simulation and power flow is presented, which can simulate the interactive between DFIG and grid failure. The effectiveness of the method proposed to search high-risk cascading failures chains under high penetration of renewable energy is verified by the simulations concerning the modified New England test system. © 2021 IEEE.

关键词： Electric load flow

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Rolling Scheduling Strategy of Electric Vehicles Based on Dynamic Clustering and Variable Horizon 4

Rolling Scheduling Strategy of Electric Vehicles Based on Dy...

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4th International Conference on Artificial Intelligence and Electromechanical Automation, AIEA 2023

作者： Song, Sijin Liu, Yutian Tan, Zukuang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Shandong Jinan250061 China Hunan Electric Power Company Limited Economic and Technical Research Institute State Grid Changsha410004 China Hunan Key Laboratory of Energy Internet Supply-demand and Operation Changsha410004 China

ISBN: (纸本)9781510666412

The overall load profile tremendously changes due to the charging of abundant electric vehicles (EVs), which brings challenges to the active power balance of distribution network. To achieve smaller fluctuation of the interactive power between the distribution network and the bulk grid, a rolling scheduling strategy of EVs based on dynamic clustering and variable horizon is proposed in this paper. First, a clustering criterion for EVs is formulated to reduce the computational complexity, and the EVs are re-clustered after each scheduling. Then, the scheduling model considering the minimum variance of comprehensive load profile and the minimum charging cost is established, whose purpose is to optimize the charging and discharging plans of the EV clusters. The scheduling horizon is the variable continuous period, which is between the starting time of the current execution horizon and the departure time of each cluster. Finally, the simulation results of modified IEEE 33-bus system verify that, the optimal EV charging and discharging plan can perfectly coordinate with the photovoltaic output profile while maximizing user satisfaction, which significantly reduces the peak-valley difference of the equivalent load. © 2023 SPIE.

关键词： Electric power distribution

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Virtual inertia control strategy for PV using DC capacitive and electrochemical energy storage 4

Virtual inertia control strategy for PV using DC capacitive ...

引用

4th IEEE International Conference on power, intelligent Computing and systems, ICPICS 2022

作者： Jiang, Zhe Ma, Linlin Gao, Zhimin Cao, Yongji Qin, Hao Yang, Dong Ma, Huan Fang, Qiao State Grid Shandong Electric Power Research Institute State Grid Shandong Electric Power Company Jinan China Shandong Power Dispatch & Control Center State Grid Shandong Electric Power Company Jinan China Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan China

ISBN: (数字)9781665467735

ISBN: (纸本)9781665467735

With the increasing penetration of renewable energies, the power system inertia is decreasing, and there is an urgent need for wind and PV generations to participate in frequency response. PV units are stationary power generating units and usually work in maximum power tracking mode. It is difficult to provide inertia support to enhance the power system frequency characteristics. Therefore, this paper proposes a frequency control strategy based on the DC capacitor energy storage on the high voltage side of PV generation, using its transient discharge process to make it participate in the frequency response. Considering the limited energy stored in the capacitor, droop control and virtual inertia control are added to the electrochemical energy storage for inertia compensation, and a cooperative inertia control strategy is proposed for PV and energy storage system. A case study is carried out to verify the effectiveness of the proposed control strategy. © 2022 IEEE.

关键词： Frequency response

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Unified Grid-Forming control for MMC-MTDC systems with Renewable power Integration 6

Unified Grid-Forming Control for MMC-MTDC Systems with Renew...

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6th International Conference on HVDC, HVDC 2024

作者： Yang, Renxin Cai, Haiqing Su, Mingzhang Gu, Haohan Chen, Zhihao Cai, Xu Shanghai Jiao Tong University Key Laboratory of Control of Power Transmission and Conversion Shanghai China Electric Power Research Institute China Southern Power Grid State Key Laboratory of Hvdc Guangzhou China National Energy Power Grid Technology R&d Centre China Southern Power Grid Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System China Southern Power Grid Guangzhou China

ISBN: (纸本)9798350387759

Using modular multilevel converter-based multi-terminal high voltage direct current (MMC-MTDC) transmission to integrate large-scale renewable power into the main power grid is an important development trend in China. To cope with the stability issues under weak grid conditions, different grid-forming control strategies have been proposed for the MMC in MTDC transmission systems. These control strategies have different structures due to different control targets and are difficult to unify. To solve this problem, a novel grid-forming control structure is proposed in this paper. The MMC emulates the synchronous generator (SG), and the submodule capacitor voltage emulates the SG rotor speed. On this basis, by utilizing the modulation control degree freedom, a unified DC-side controller is proposed to realize different control targets. Finally, the simulation model of a 4-terminal MMC-MTDC transmission system with renewable power integration is established in the PSCAD/EMTDC. The effectiveness of the proposed strategy is verified by the simulation results. © 2024 IEEE.

关键词： grid-forming MMC-MTDC multi-targets control unified control structure

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DOFF-RLS-Based Equivalent Inertia Estimation for power system with PV 4

DOFF-RLS-Based Equivalent Inertia Estimation for Power Syste...

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4th IEEE International Conference on power, intelligent Computing and systems, ICPICS 2022

作者： Ma, Huan Yang, Dong Qin, Hao Cao, Yongji Gao, Zhimin Zhang, Bing Cheng, Dingyi Zhang, Zhixuan State Grid Shandong Electric Power Research Institute State Grid Shandong Electric Power Company Jinan China Key Laboratory of Power System Intelligent Dispatch and Control The Ministry of Education Shandong University Jinan China Shandong Power Dispatch & Control Center State Grid Shandong Electric Power Company Jinan China

ISBN: (数字)9781665467735

ISBN: (纸本)9781665467735

With the use of photovoltaic (PV) generation, a large number of synchronous generation units have been replaced, resulting in obvious decline in the equivalent inertia of power system. Facing a lack of inertia, virtual inertia control techniques are applied to PV, but there is a lack of methods to estimate the equivalent inertia of PV in real time, making it difficult to quantitatively estimate the effect of control method with virtual inertia. Therefore, this paper adopts the controlled autoregressive (CAR) identification model and the recursive least square algorithm of dynamic optimal forgetting factor (DOFF-RLS) to estimate the PV equivalent inertia, in order to address the time varying characteristics of the PV equivalent virtual inertia. The proposed identification model and solution algorithm have superior tracking capability and good convergence. All that is required is to obtain the disturbance data of frequency and active power from the point of common coupling from the phasor measurement unit (PMU). Finally, the accuracy and suitability of the identification model and method are verified by simulation. © 2022 IEEE.

关键词： Virtual addresses

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