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Two-layer multi-timescale rolling optimization of electric-hydrogen hybrid energy storage systems considering renewable energy uncertainties

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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 2025年 106卷 305-317页

作者： Wei, Meijia Chen, Jian Zhang, Wen Chen, Yang Zhang, keyu Lin, Da Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Peoples R China State Grid Zhejiang Elect Power Res Inst Hangzhou 310004 Peoples R China

To address the variability in the scheduling timescale of electric and hydrogen energy and the high uncertainties caused by the high proportion of renewable energy, this paper proposes a two-layer multi-timescale rolling optimization method for electric-hydrogen hybrid energy storage systems (EH-HESS) considering renewable energy uncertainties. In the upper-layer long-timescale optimization, a fuzzy set of wind turbine (WT) and photovoltaic (PV) generation forecast errors is established based on the Wasserstein distance, and a distribution robust optimization (DRO) model is proposed for energy scheduling. In the lower-layer short-timescale optimization, typical scenarios are generated for the potential distribution of WT and PV generation. After receiving the upper-layer scheduling results, a short-timescale power scheduling model is established. The lower-layer scheduling results are passed back to the upper-layer to achieve a two-layer multi-timescale rolling optimization. Simulations show that the proposed method can achieve inter-day transfer of hydrogen energy, reduce the daily imbalanced electric energy and effectively suppress the fluctuation of WT and PV generation. Moreover, the method demonstrates notable economic benefits, higher by 21.71% and 18.87% respectively, than singletimescale energy storage and robust optimization (RO), enabling a balance between economy and robustness. Finally, a detailed sensitivity analysis is conducted to show the effect of the fuzzy set radius on the scheduling results.

关键词： Electric-hydrogen hybrid energy storage systems (EH-HESS) Two-layer multi-timescale rolling optimization Distribution robust optimization (DRO) Typical scenarios generation Uncertainties

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Interaction Effect Laws among Multiple L-Based Grid-Connected Inverters in the Weak power Grid 7

Interaction Effect Laws among Multiple L-Based Grid-Connecte...

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7th International Conference on Energy, Electrical and power Engineering (CEEPE)

作者： Fan, Shuxian Yun, Zhihao Wang, Yuanqi Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan Peoples R China

ISBN: (纸本)9798350375794;9798350375800

The long transmission lines and the increase in the number of grid-connected inverters in the weak grid make the grid impedance non-negligible. The presence of grid-equivalent impedance couples multiple inverters through the point of common coupling, thus inducing complex interactions among the inverters. Taking the L-based inverter as the research object, an equivalent model for multiple inverters in the weak grid is established, and solve its multiple-input and multiple-output expression. Two, three and four multi-inverter models are constructed by Simulink to analyze the general laws of the number of inverters, control parameters, filtering parameters and grid strength affecting the inverter interaction effect.

关键词： grid-connected inverters interaction effect weak grid grid strength control parameter

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A Short-Term Voltage Stability Evaluation Method Combining Data-Driven and Mechanism Criterion

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IEEE TRANSACTIONS ON power systemS 2025年第2期40卷 1891-1902页

作者： Li, Baoluo Xu, Shiyun Li, Zonghan Sun, Huadong Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250014 Peoples R China China Elect Power Res Inst Beijing 100192 Peoples R China

In order to accurately and quickly assess the short-term voltage stability (STVS) of a power system, this paper utilizes a data-driven method to enhance the power current criterion (PCC) to form a real-time assessment method for STVS. First, the fixed voltage threshold adopted by PCC is taken as the parameter to be enhanced, and the labeling method of dynamic threshold and the data set generation scheme are proposed. Then, Gate recurrent unit (GRU) network is utilized to establish the mapping relationship between the voltage trajectory and the dynamic threshold, and a penalty loss function is designed based on the classification principle of the criterion to enhance the usability of the prediction threshold. Finally, a set of time-adaptive evaluation scheme for online applications is proposed. The scheme first utilizes PCC to monitor the system, and then combines the dynamic threshold provided by GRU to complete the evaluation. Compared with traditional methods, the proposed method has good accuracy, timeliness and interpretability. In particular, the method is directly oriented to the measurement data, and its monitoring scope can adapt to the observability of the power grid. Test results in CSEE-VC(88-2023) and actual power grid validate the effectiveness of the proposed method.

关键词： power system stability Indexes Stability criteria Accuracy Threshold voltage Circuit faults Monitoring Short term voltage stability power current criterion data-driven model-free

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Partial Solution Operator Discretization-Based Methods for Efficiently Computing Least-Damped Eigenvalues of Large Time Delayed power systems

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CSEE Journal of power and Energy systems 2025年第2期11卷 671-682页

作者： Hua Ye Xiaofan Jia Muyang Liu Yutian Liu Sicong Zhang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of EducationShandong UniversityJinan 250061China School of Electrical Engineering Xinjiang UniversityUrumqi 830046China State Grid Jiangsu Electric Power Research Institute Nanjing 211103China

To investigate impact of time delays on the small signal stability of power systems, the least-damped eigenvalues with the smallest damping ratios have been calculated by eigen-analysis methods based on Solution Operator Discretization (SOD) with Pseudo-Spectral collocation (PS) and Implicit Runge-Kutta (IRK) methods. This paper evolves SOD-PSIIRK into their partial counterparts, i.e., PSOD-PSIIRK, with greatly enhanced efficiency and reliability in analyzing large-scale time delayed power systems. Compared with SOD-PSIIRK, PSOD-PSIIRK are characterized in constructing low order discretization matrices of solution operator as well as efficiently and directly solving the embedded Matrix-Inverse-Vector Products (MIVPs). The dimensions of the discretization matrices of solution operator are largely reduced as only the retarded state variables are discretized, rather than all state variables as in SOD-PSIIRK. Meanwhile, the proposed PSOD-PSIIRK optimize the most computationally expensive operations in SOD-PSIIRK by avoiding the iterative solutions to the two embedded MIVPs. PSOD-PS/IRK directly and efficiently compute the MIVPs via factorizing the Kronecker product-like discretization matrices of the solution operator into Schur complements. The Central China-North China ultra-high-voltage power grid with 80577 state variables serves to validate the proposed PSOD-PSIIRK and shows that compared with SOD-PSIIRK, the computational time consumed by PSOD-PSIIRK is cut down by 49.96 times without loss of any accuracy.

关键词： Eigenvalue analysis low frequency oscillation Schur complement decomposition small signal stability solution operator discretization spectral discretization time delay wide-area measurement system

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Fault line selection algorithm for single-phase grounding faults in distribution networks based on multi-feature fusion of multi-level wavelet decomposition coefficients

Fault line selection algorithm for single-phase grounding fa...

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2024 International Conference on Electrical Technology and Automation Engineering, ETAE 2024

作者： Li, Jinyao Wu, Shouyuan Gao, Lixue Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Shandong Jinan250061 China

This paper introduces a novel method for determining fault lines, addressing the time-consuming nature of traditional steady-state quantity methods and the susceptibility to errors in transient quantity methods. A multi-feature fusion technique, involving multi-level wavelet decomposition coefficients, is employed. This involves the extraction of zero-sequence current wavelet transform coefficients with the Discrete Wavelet Transform (DWT), and the formation of a similarity function through the S-transform. Subsequently, an energy measure function is derived by integrating these coefficients. A function representing faultiness, aligned with various fault lines, is then developed and used as the primary criterion for identifying the faulted line. Simulation data from a single-phase grounding fault model in a distribution network confirms the efficacy of the method in choosing fault lines. © Published under licence by IOP Publishing Ltd.

关键词： Discrete wavelet transforms

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Grid Strength Assessment Method for Evaluating Small-signal Synchronization Stability of Grid-following and Grid-forming Converters Integrated systems

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Journal of Modern power systems and Clean Energy 2025年第1期13卷 55-65页

作者： Qianhong Shi Wei Dong Guanzhong Wang Junchao Ma Chenxu Wang Xianye Guo Vladimir Terzija Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education School of Electrical EngineeringShandong UniversityJinan 250061China Electric Power Research Institute State Grid Zhejiang Electric Power Co.Ltd.Hangzhou 310014China School of Engineering Newcastle UniversityNewcastle upon TyneUK

Oscillations caused by small-signal instability have been widely observed in AC grids with grid-following(GFL)and grid-forming(GFM)*** generalized short-circuit ratio is commonly used to assess the strength of GFL converters when integrated with weak AC systems at risk of *** paper provides the grid strength assessment method to evaluate the small-signal synchronization stability of GFL and GFM converters integrated ***,the admittance and impedance matrices of the GFL and GFM converters are analyzed to identify the frequency bands associated with negative damping in oscillation modes dominated by heterogeneous synchronization ***,based on the interaction rules between the short-circuit ratio and the different oscillation modes,an equivalent circuit is proposed to simplify the grid strength assessment through the topological transformation of the AC *** risk of sub-synchronization and low-frequency oscillations,influenced by GFL and GFM converters,is then reformulated as a semi-definite programming(SDP)model,incorporating the node admittance matrix and grid-connected device *** effectiveness of the proposed method is demonstrated through a case analysis.

关键词： Grid-following converter grid-forming converter grid strength assessment small-signal stability

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A correction method for wind power forecast considering the dynamic process of wind turbine icing

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ELECTRIC power systemS RESEARCH 2025年 246卷

作者： Yang, Ming Zhou, Haoyang Li, Menglin Wang, Bo Wang, Fei Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Peoples R China Shandong Univ Shandong Key Lab Digital Smart Energy Jinan 250061 Peoples R China China Elect Power Res Inst State Key Lab Operat & Control Renewable Energy & Beijing 100192 Peoples R China

In order to improve the accuracy of wind power forecast (WPF) in wind turbine icing scenarios, this paper proposes a methodology for the correction of WPF that takes into account the impact of dynamic ice accumulation processes. Firstly, the icing calculation formula applicable to wind turbine blades is derived based on the Makkonen model. Concurrently, multiple sets of simulations are performed by FENSAP-ICE software to obtain the key parameters of icing calculation formula under discrete weather conditions. Then, the Kriging interpolation algorithm is introduced to construct continuous mapping functions from weather conditions to icing parameters, allowing real-time icing degree can be calculated using the icing formula derived from numerical weather prediction (NWP) data, thereby describing the dynamic icing process. Finally, an additional correction model based on few-shot learning is proposed, which can maintain good forecast performance with sparse ice cover samples. By forecasting wind power loss under varying icing conditions, the model corrects the WPF results, and the case studies demonstrate that after applying the proposed methodology, the accuracy of WPF under icing conditions is significantly improved.

关键词： Wind turbine blade ice cover Numerical simulation Kriging interpolation Wind power forecast Few-shot learning

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power system restoration with large renewable Penetration: State-of-the-Art and future trends

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INTERNATIONAL JOURNAL OF ELECTRICAL power & ENERGY systemS 2024年第PartA期155卷

作者： Liang, Kunjie Wang, Hongtao Pozo, David Terzija, Vladimir Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250000 Peoples R China Skolkovo Inst Sci & Technol Skolkovo Moscow 121205 Russia

The catastrophic blackout events and ever-increasing penetration of renewable power generation highlight an advanced restoration strategy to effectively and reliably employ renewable power generation to contribute to renewable power system restoration. This paper reviews the research advances of power system restoration involving large renewable peneration, and the methods of handling renewable power uncertainty during restoration are also summarized. First, the transmission system restoration processes are divided into three sequential stages: a) black-start, b) network reconfiguration and c) load restoration, and the research advances of these three restoration stages involving large renewable generation are presented. Then, the distribution system restoration assisted by multiple flexible resources, such as renewable distributed generators, remotely-controlled switches, energy storage systems, and soft open points, are reviewed with emerging techniques, including microgrids, multi-agent systems, repair crews, and mobile power sources. Furthermore, with the growing activeness and flexibility of the distribution system, the coordinated transmission and distribution system restoration and their information interactions are also discussed. Finally, for practical applications, the laboratory validations of restoration strategies using realistic power grid data, real-world restoration strategies, decision support systems, and field tests of black-start procedures are introduced to complete this literature review. Effectively deploying renewable power sources can significantly improve the power system restoration efficiency, and their inherent uncertainty should be carefully handled. Moreover, promising research trends are provided to improve the power system restoration with large renewable penetration.

关键词： Blackout Coordination Renewable energy Restoration Uncertainty

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DSO-prosumers cooperative scheduling approach considering multi-timescale peer-to-peer transactions of electricity and flexibility resources

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SUSTAINABLE ENERGY GRIDS & NETWORKS 2025年 42卷

作者： Wang, Kang Wang, Chengfu Dai, Jianwei Dong, Shuang Cui, Yongling Wang, Guoying Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Shandong Peoples R China Shandong Elect Power Engn Consulting Inst Corp Ltd Jinan 250061 Shandong Peoples R China

The rapid evolution of peer-to-peer (P2P) transaction mechanisms has facilitated end-use prosumers in energy sharing to enhance energy utilization and address uncertainties in renewable energy sources (RES). However, the lack of coordination across different timescales and heterogeneous distributed resources results in potential economic losses. To this end, a cooperative scheduling approach considering multi-timescale P2P transactions is proposed. Firstly, multi-timescale P2P transactions mechanism is proposed to coordinate the heterogeneous resources between prosumers. In day-ahead stage, prosumers engage in electricity transactions using expected output of RES. In intraday stage, flexible resources are traded among prosumers to mitigate prediction deviation of RES. Meanwhile, the Nash bargaining theory is introduced to allocate the interests. Then, to determine reasonable flexibility requirement in intraday stage, a two-side chance constrained economic dispatch (TS-CCED) model is proposed, in which DSO can set the reference requirement interval at given confidence level to balance the economy and safety of system operation. Finally, to reduce the computational complexity, the Gaussian mixture model is applied to convert the TS-CCED model into a convex optimization problem with guaranteed accuracy. Case study based on the IEEE 33-bus system and IEEE-123 bus system verifies the effectiveness of the proposed method.

关键词： Peer-to-peer transaction Two-side chance constrained economic dispatch Gaussian mixture model Multi-timescale Nash bargaining theory

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Parameter Optimization for Temporary Primary Frequency control of Wind Turbines Based on Analytical Derivation 4

Parameter Optimization for Temporary Primary Frequency Contr...

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2023 4th International Conference on Mechanical Instrumentation and Automation, ICMIA 2023

作者： Wei, Xinyu Jin, Zhaoyang Li, Gengkun Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University China

DFIG has the capability to participate in power system frequency modulation through inertial control by returning the energy stored in the rotating mass of the generator that is delivered to the grid. When frequency modulation occurs, the primary frequency drop can lead to a reduction in the rotor kinetic energy stored in the DFIG, which is subsequently used to produce extra active power to sustain the system frequency. However, once the available rotor kinetic energy is released, the output power of the DFIG abruptly drops to restore the rotor speed. To reduce the extent of the secondary frequency deviation caused by the inertial control of DFIGs, this paper applies an analytically derived approach to optimize the parameters of temporary primary frequency control during rotor speed recovery. Specifically, the parameters optimized include termination time and active power Simulation results conducted using DIGSILENT simulation software have demonstrated that the optimized temporary primary frequency control strategy is capable of effectively reducing the secondary frequency drop that may occur when the DFIG is removed from frequency control. Moreover, setting the optimal termination time and controlling the active power output while the rotor speed is being restored are crucial to prevent excessive mechanical wear and fatigue that may be induced by a too-rapid recovery of rotor speed. © Published under licence by IOP Publishing Ltd.

关键词： Kinetic energy

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