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检索条件"机构=Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education"

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

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

引用

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

作者： Shuxian Fan Zhihao Yun Yuanqi Wang Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan China

ISBN: (数字)9798350375794

ISBN: (纸本)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： Power transmission lines Software packages Filtering Simulation Stability criteria Power system stability Transmission line measurements

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Transient Stability Analysis and Enhancement of Virtual Synchronous Generator with Current Limiter

Transient Stability Analysis and Enhancement of Virtual Sync...

引用

China International Electrical and Energy Conference (CIEEC)

作者： Yantuan Wang Hua Ye Jialun Yang Xiaodong Chu Qianying Mou Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

ISBN: (数字)9798350359558

ISBN: (纸本)9798350359565

The modern power system exhibits a double high characteristic, where the physical structure and control strategies of power electronic devices have altered the stability characteristics of the modern power system. This paper investigates the transient instability issue faced by virtual synchronous generators (VSG) equipped with a current limiter during grid faults. Firstly, the transient stability model of the VSG is established. Then, the equal-area criterion (EAC) is employed to reveal the mechanism of transient instability in VSG and elucidate the influence of the current limiter on the transient stability of VSG. Based on this analysis, current angle configuration methods are further proposed to enhance the transient stability of VSG. Finally, the correctness of the mechanism analysis and proposed methods is validated through simulation.

关键词： Laser mode locking Stability criteria Switches Power system stability Synchronous generators Logic Transient analysis

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Transient Stability Evaluation of Independent Microgrid based on Message Passing Graph Neural Network 6

Transient Stability Evaluation of Independent Microgrid base...

引用

6th International Conference on Electronics Technology, ICET 2023

作者： Zhen, Jiubao Huang, Shufan Jia, Xuwen Du, Haocheng China Agricultural University College of Information and Electrical Engineering Beijing100083 China Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan250061 China

ISBN: (纸本)9798350337693

Virtual synchronous generator is used to control independent microgrid to provide inertia and damping support, but it often brings transient stability problems. Due to the large number of nonlinear and non-smooth characteristics of highly electronic independent microgrid, it is difficult to analyze it by the traditional transient stability analysis method. In this paper, the independent microgrid controlled by virtual synchronization is taken as the object. Firstly, we compare the impact of detailed modeling of energy storage and simplified modeling on the transient stability, and then discuss the impact of current limiting link of virtual synchronous machine on the transient stability. Secondary, combined with the idea of graph neural network, we propose an independent microgrid transient stability evaluation model based on message passing graph neural network. The information corresponding to bus and transmission lines in microgrid is aggregated and updated by message passing mechanism, so as to depict the topological connection relationship of microgrid, and then consider the influence of topology structure on transient stability evaluation. Last, a WSCC-9 system with virtual synchronous machine is taken as an example. The results show that considering the energy storage detailed model and current limiting link can effectively improve the accuracy of stability analysis. The proposed method has stronger generalization ability and is more applicable to the microgrid system with variable topological structure. © 2023 IEEE.

关键词： Stability

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Sub-Synchronous Oscillation Suppression in Series-Compensated Grid-Connected Doubly-Fed Wind Turbines Utilizing Virtual Inductance on the Rotor Side

Sub-Synchronous Oscillation Suppression in Series-Compensate...

引用

China International Electrical and Energy Conference (CIEEC)

作者： Haobo Wang Hongtao Wang Peiqi Xin Zhen Song Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

ISBN: (数字)9798350359558

ISBN: (纸本)9798350359565

To tackle the issue of Sub-Synchronous control Interaction (SSCI) in doubly fed wind turbines featuring series capacitor compensation, a novel approach is undertaken by creating an impedance model for the Doubly Fed Induction Generator (DFIG). This model utilizes a power outer-loop control method for decoupling, in alignment with IEEE standards. The study extensively examines the genesis and underlying causes of sub-synchronous oscillations. A novel rotor-side suppression strategy, featuring the integration of virtual inductance into the DFIG's rotor control loop, is proposed to mitigate oscillations induced by series-compensated transmission line parameters. Comparative analysis indicates that the inclusion of virtual inductance effectively quells sub-synchronous oscillations. Additionally, a Simulink-based grid-connected DFIG model is constructed, and time-domain simulations are conducted to validate the model's accuracy in predicting grid-connected sub-synchronous oscillations and confirm the efficacy of the proposed suppression technique.

关键词： Inductance Power transmission lines Doubly fed induction generators Rotors Predictive models IEEE Standards Wind turbines

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Online Monitoring Method for Transformer Winding Deformation Based on Leakage Magnetic Induction Coefficient Identification

Online Monitoring Method for Transformer Winding Deformation...

引用

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

作者： Mengfei Wu Guoxin Lu Shiming Liu Yongqi Kang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

ISBN: (数字)9798331523527

ISBN: (纸本)9798331523534

In response to the shortcomings of existing transformer winding deformation detection methods, this paper proposes an online monitoring scheme for winding deformation based on changes in leakage magnetic induction coefficients. Using the Roth method, an analytical calculation model for leakage magnetic fields under normal and deformed conditions of the windings is established, which is then validated against finite element simulations, with an error margin of less than 2%. The Recursive Least Squares algorithm is employed to extract the leakage magnetic induction coefficients in real time, which are then compared with the coefficients obtained from the analytical model to derive characteristic parameters that represent the health status of the windings. Corresponding threshold calibration methods are established, resulting in a high-sensitivity and high-reliability online monitoring scheme capable of accurately identifying various winding deformations of 5% or more, as well as determining the location of the deformed windings. Finally, finite element simulation models for both normal and deformed transformer windings are constructed in ANSYS-Maxwell, confirming the effectiveness of the online monitoring scheme.

关键词： Deformable models Analytical models Parameter estimation Deformation Windings system integration Real-time systems Finite element analysis Magnetic fields Monitoring

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Energy Storage Sizing for IES Considering Carbon Trading and Demand Response 6

Energy Storage Sizing for IES Considering Carbon Trading and...

引用

6th International Conference on Power and Energy Applications, ICPEA 2023

作者： Zhang, Lipeng Cao, Kuan Li, Yuwen Gao, Jie Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Jinan China State Grid Weihai Power Supply Company Development Planning Department Weihai China

ISBN: (纸本)9798350359053

An optimal energy storage sizing method for integrated energy system (IES) considering carbon trading and demand response is presented in this paper. Firstly, to effectively limit carbon emissions, a reward-penalty laddered carbon trading model is designed to convert carbon emissions into system costs or revenues. Secondly, the integrated demand response (IDR) model for electrical-cold-heat loads is established based on time-of-use price to enhance the operational flexibility and economy. Then, based on these two sub-models, an optimal energy storage sizing model is built to minimize the total life cycle cost including investment, operation and carbon trading cost. Finally, the simulation results indicate that a successful balance between low-carbon and economy can be achieved by the proposed method. © 2023 IEEE.

关键词： Energy storage

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Frequency Domain Stability Analysis and Simulation of New Energy Power Generation systems

Frequency Domain Stability Analysis and Simulation of New En...

引用

Power and Electrical Engineering (ACPEE), 5th Asia Conference on

作者： Haobo Wang Hongtao Wang Peiqi Xin Zhen Song Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

ISBN: (数字)9798350309638

ISBN: (纸本)9798350309645

Stability analysis of grid-connected inverters is advanced through impedance analysis in this study, which leads to the development of a comprehensive mathematical model and simulation. control parameters, notably the voltage inner-loop control parameter $K_{v}$, the proportional gain $K_{p}$ of the phase-locked loop (PLL), and the integral gain $K_{i}$, were meticulously adjusted to assess their effects on subsynchronous oscillations. It was determined that while the proportional gain $K_{p}$ and integral gain $K_{i}$ have a marginal impact on sub-synchronous oscillations, the voltage inner-loop control parameter $K_{i}$ significantly influences these oscillations. The insights gained from this analysis contribute to a deeper understanding of, and potential solutions for, synchronous oscillation issues. The ability to mitigate such oscillations facilitates the integration of a higher proportion of renewable energy sources, thereby enhancing the stability and reliability of the electrical power system. This enhancement is of critical importance in the pursuit of sustainable energy transitions and the advancement of clean energy sources.

关键词： Power system stability Stability analysis Mathematical models Inverters Power system reliability Reliability Voltage control

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Optimal Dispatch for Large-Scale Renewable Energy Bases Without Conventional Power Support

Optimal Dispatch for Large-Scale Renewable Energy Bases With...

引用

IEEE Region 10 International Conference TENCON

作者： Kunpeng Zhang Tianhao Liu Yutian Liu Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

ISBN: (数字)9798350350821

ISBN: (纸本)9798350350838

In large-scale renewable energy base and HVDC systems, the absence of conventional power support makes commutation failures a significant threat to system security and stability. An optimal dispatch method based on Kolmogorov-Arnold Networks (KAN) is proposed, which considers voltage and frequency dynamic security constraints. First, a time-domain simulation model of the system is developed to generate training data for KAN. The KAN is then designed to estimate the transient overvoltage at the point of common coupling in the renewable energy base after the occurrence of commutation failure. Frequency fluctuation is calculated by frequency nadir prediction model. Thirdly, an optimal dispatch model is formulated to maximize the delivered power of HVDC, which considers both operational and dynamic security constraints. Simulation results demonstrate that the proposed optimal dispatch model enhances system security with an acceptable reduction in delivered power.

关键词： Renewable energy sources Simulation HVDC transmission Training data Predictive models Stability analysis Security Voltage control Transient analysis Time-domain analysis

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A Distributionally Robust Optimal Allocation Method of Energy Storage for Resilience Enhancement of Distribution Network

A Distributionally Robust Optimal Allocation Method of Energ...

引用

2023 IEEE International Conference on Energy Technologies for Future Grids, ETFG 2023

作者： Cao, Kuan Liu, Yutian Wang, Chunyi Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan China State Grid Shandong Electric Power Company Development Planning Department Jinan China

ISBN: (纸本)9781665471640

To solve the problem of active power imbalance in distribution network with high penetrations of photovoltaic (PV) under extreme weather, the paper proposes a distributionally robust optimal allocation method of energy storage considering extreme scenarios. Firstly, considering that the effect of energy storage on enhancing the resilience of distribution network is strongly related to its location, resilience indexes based on node evaluation are established to select the installation sites of energy storage. Secondly, in view of the correlation and randomness of PV output and load, the typical scenarios with the empirical probability distribution are generated based on Frank Copula joint probability distribution function. Then, Kullback-Leibler divergence is utilized to characterize the probability distribution ambiguity set of the typical scenarios. Based on the ambiguity set, a two-stage distributionally robust optimization model for energy storage capacity is established to minimize the cost of energy storage investment and distribution network operation. For further improving the resilience, an operational resilience index as a chance constraint considering extreme scenarios is embedded into the model. Finally, the case study shows that the proposed method can effectively improve PV accommodation capacity of distribution network and reduce load loss in extreme scenarios. © 2023 IEEE.

关键词： copula function distributionally robust optimization energy storage allocation Kullback-Leibler divergence resilience

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Voltage and Frequency control Coordination Strategy of Wind-PV-ESS system for Black-Start

Voltage and Frequency Control Coordination Strategy of Wind-...

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IEEE International Conference on Power and Energy Applications (ICPEA)

作者： Haoda Lei Kuan Cao Runjia Sun Yutian Liu Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

ISBN: (数字)9798350356113

ISBN: (纸本)9798350356120

In blackout scenarios of new power systems, wind farms (WF) and photovoltaic power stations (PVS) configured with scaled energy storage system (ESS) can be used as sources to support the black-start of thermal power units. Aiming at the disturbance of system voltage and frequency during black-start, a voltage and frequency control coordination strategy of Wind-PV-ESS system for black-start is proposed. The voltage control strategy includes normal control mode and correction control mode. When the bus voltage keeps within the limit, the former coordinately distributes the reactive power of each WT and PVA to maximize the dynamic reactive power reserve. After the bus voltage is disturbed beyond the limit, the latter makes full use of the fast dynamic reactive power response characteristics of SVG and ESS to provide voltage support. In the frequency control strategy. the reference power generated by the PI controller is allocated according to the proportion of the reserve power of each wind turbine (WT) or photovoltaic array (PVA) to the total reserve to eliminate the frequency deviation. Simulation results show the effectiveness of the proposed strategy.

关键词： Photovoltaic systems Reactive power PI control Simulation Power system dynamics Wind farms Wind turbines Voltage control Frequency control Radio spectrum management

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