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Aggregation Modeling of system Frequency Response Under Inertia control of Grid-following Direct-drive Wind Turbine

Dianli Xitong Zidonghua/Automation of Electric power systems 2025年第10期49卷 39-48页

作者： Jiang, Chao Yang, Dongfeng Guo, Shujia Liu, Xiaojun Zhou, Shuyu Cao, Zhichong Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin132012 China School of Automation and Electrical Engineering Zhejiang University of Science and Technology Hangzhou310023 China State Grid Jilin Electric Power Research Institute Changchun130000 China

The inertia control of grid-following direct-drive wind turbines significantly influences the system frequency response pattern afrer disturbances. However, current research has not clearly identified the dominant response link of direct-drive wind turbines in frequency regulation, while the modeling is too complicated to be suitable for frequency characteristic analysis. Therefore, the linearized models under inertia control are derived for two typical types of direct-drive wind turbines according to the aerodynamic equations, generator models, power control link, and control circuit structure. The fast physical process of current control-boost circuit/stator voltage dynamic loop is clearly understood and reasonably ignored. It is revealed that the two types of direct-drive wind turbines have a common frequency response mechanism which can be described as the cascade effect of the speed regulator-wind rotor motion equation. Furthermore, combined with the frequency response model of synchronous unit, the aggregation model of system frequency response under the inertia control of grid-following direct-drive wind turbines is constructed, and the aggregation model is reduced to a second-order model by the balance truncation method for analytical calculation of frequency extremes. The accuracy and applicability of the aggregation model and its reduced-order model are verified by MATLAB/Simulink simulation, and the influence of control parameters and system states on frequency dynamic characteristics and stability margin is analyzed. © 2025 Automation of Electric power systems Press. All rights reserved.

关键词： Electric power system control

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Research on Partition Method of Distributed Photovoltaic Cluster Based on Modularity Index and Absorption Ability 2

Research on Partition Method of Distributed Photovoltaic Clu...

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2nd International Conference on Smart Grids and Energy systems, SGES 2023

作者： Meng, Tao Lv, Xiangyu Li, Chenggang Li, Dexin Zhang, Yifu Meng, Xiangdong State Grid Jilin Electric Power Co. Ltd. Electric Power Research Institute China Northeast Electric Power University Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education School of Electrical Engineering Changchun Jilin China

ISBN: (纸本)9798350371659

To achieve large-scale renewable energy, grid friendly coordination and the need to maximize grid-connection and consumption functions, the clustering method has become a forward-looking solution for distribution network planning, construction and dispatching control. In this paper, the modularity index and active power balance index based on electrical distance are taken as the comprehensive classification index. Then genetic algorithm is introduced to divide the distributed PV cluster in the distribution network. Finally, a 10kV distribution system is taken as an example, and the distributed photovoltaic cluster planning is simulated and analyzed, which proves that the distributed photovoltaic cluster division method is effective. © 2023 IEEE.

关键词： Genetic algorithms

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A Two-layer Adaptive control Strategy for Photovoltaic power in Different Scenarios 3

A Two-layer Adaptive Control Strategy for Photovoltaic Power...

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3rd International Conference on Energy engineering and power systems, EEPS 2023

作者： Wan, Yanghui Yan, Jiahao Chu, Tianfeng Li, Yaping Yuan, Kun Zhang, Kaifeng Southeast University Key Laboratory of Measurement and Control of Complex System of Engineering Ministry of Education Nanjing China Power Automation Department Nanjing China State Grid Liaoning Electric Power Co. Ltd. Electric Power Research Institute Shenyang China

ISBN: (纸本)9798350313857

Currently, control strategies for distributed photovoltaic (PV) power generation are relatively single and rigid, and cannot flexibly adapt to the diverse demands of power grids in different scenarios. Firstly, this paper analyzes the adaptive relationship between different dispatching demands, the regulation ability of distributed PV, and the characteristics of the local voltage. Secondly, for different scenarios, the coordinated controller determines the reference values of active power and reactive power given to the inverter. Thus, distributed PV power control modes which can adapt to different scenarios have been established. Then, these control modes can be classified into single control modes and compound control modes according to the complexity of scenario demands. On this basis, a specific two-layer adaptive control strategy and process of distributed PV power generation in a low-voltage distribution network are further proposed, which takes into account both external demands of the distribution network and the regulation ability of distributed PV. Finally, a case study is given to verify the rationality and effectiveness of the two-layer adaptive scenarios control strategy. This strategy can effectively improve the comprehensive support ability of distributed PV power generation towards the power grid in multiple scenarios, and improve the stable operation level of the regional power grid. © 2023 IEEE.

关键词： Reactive power

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Flexible linear clock-based distributed self-triggered active power-sharing secondary control of AC microgrids

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Global Energy Interconnection 2024年第6期7卷 786-797页

作者： Yulin Chen Xing Huang Guangxin Zhi Shaohua Yang Hongxun Hui Donglian Qi Yunfeng Yan Fengkai Gao Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology Ministry of Education(Northeast Electric Power University)Jilin132012P.R.China Hainan Institute Zhejiang UniversitySanya572000P.R.China College of Electrical Engineering Zhejiang UniversityHangzhou310027P.R.China State Key Laboratory of Internet of Things for Smart City University of MacaoMacao999078P.R.China

Traditional active power sharing in microgrids,achieved by the distributed average consensus,requires each controller to continuously trigger and communicate with each other,which is a wasteful use of the limited computation and communication resources of the secondary *** enhance the efficiency of secondary control,we developed a novel distributed self-triggered active power-sharing control strategy by introducing the signum function and a flexible linear *** continuous communication–based controllers,the proposed self-triggered distributed controller prompts distributed generators to perform control actions and share information with their neighbors only at specific time instants monitored by the linear ***,this approach results in a significant reduction in both the computation and communication ***,this design naturally avoids Zeno ***,a modified triggering condition was established to achieve further reductions in computation and *** simulation results confirmed that the proposed control scheme achieves distributed active power sharing with very few controller triggers,thereby substantially enhancing the efficacy of secondary control in MGs.

关键词： Active power sharing Distributed secondary control Self-triggered mechanism AC microgrid control efficiency

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An Efficient power system Risk Identification Method Considering PMU Bad Data

An Efficient Power System Risk Identification Method Conside...

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2023 IEEE Sustainable power and Energy Conference, iSPEC 2023

作者： Wang, Yin Li, Jieling Liu, Mingshun Chang, Dongxu Zhu, Lingzi Guo, Liweiyong Power Dispatching Control Center of Guizhou Power Grid Co. Ltd. Guiyang550000 China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou510663 China School of Electrical Engineering Chongqing University Chongqing400044 China

ISBN: (纸本)9798350322699

The phasor measurement unit (PMU) is widely employed in modern power systems, which enables real-time power system status monitor and risk identification. However, the bad data caused by PMU failure may mislead the risk identification. This paper proposes an efficient power system risk identification method considering PMU bad data. First, this paper describes the risk identification problem based on the analysis of the characteristics of PMU bad data and the power system contingency events. Then, the Teager-Kaiser energy operator with the 3Sigma criterion is proposed for the initial PMU anomaly data screening. Next, based on the difference between the bad data and the contingency events, the Pearson correlation coefficient is adopted for the calculation of the spatial similarity. Finally, a local outlier probability algorithm is presented to analyze the metrics. Case studies are carried out on IEEE 39 and IEEE 118 systems. Results demonstrate that the proposed method has an efficient risk identification accuracy with PMU abnormal data. © 2023 IEEE.

关键词： bad data Phasor measurement unit risk identification

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STUDY ON RISK STATE IDENTIFICATION AND PREDICTION METHOD AND SOFTWARE TOOL DESIGN OF DIGITAL control systemS 30

STUDY ON RISK STATE IDENTIFICATION AND PREDICTION METHOD AND...

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30th International Conference on Nuclear engineering, ICONE 2023

作者： Zhang, Chao Chen, Sijuan Zhu, Ruoyu Sun, Jiajun Dong, Xiaomeng Li, Weihao Yang, Ming Xu, Anqi Wang, Jipu Department of Science and Technology Innovation State Nuclear Power Automation System Engineering Company Shanghai China Institute for Advanced Study in Nuclear Energy & Safety College of Physics and Optoelectronic Engineering Shenzhen University Guangdong Province Shenzhen City China Power Plant Control Center State Nuclear Power Automation System Engineering Company Shanghai China Shenzhen University Guangdong Province Shenzhen City China

ISBN: (纸本)9784888982566

With the overall improvement of the digital and intelligent level in the nuclear power industry, the failure of the Digital control system (DCS) has become one of the major factors affecting the stable operation of nuclear power units. DCS safety problems can easily lead to the unit outage or shutdown, power reduction operation, system or equipment degradation events and other serious consequences, which will significantly threaten the safety and reliability of the unit operation. This paper studies the real-time safety problem of DCS based on the monitoring data of DCS itself, focusing on DCS current operating risk state identification, operating risk state transition model construction, residual operating risk prediction, to evaluate DCS operating risk state and predict the risk evolution trend. Furthermore, this study focus on the design and development of the software tool for risk state identification and prediction of DCS, so as to implement the methods and algorithms presented herein. © 2023 by JSME.

关键词： Digital control systems

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Conflict Mechanism Analysis Method for Electric Vehicles Participating in Multiple Types of power Grid Ancillary Services

Conflict Mechanism Analysis Method for Electric Vehicles Par...

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2023 International Conference on power system Technology, powerCon 2023

作者： Xue, Yinjuan Chen, Qifang Cai, Haiqing Xia, Mingchao Gu, Haohan School of Electrical Engineering Beijing Jiaotong University Beijing China State Key Laboratory of Hvdc Electric Power Research Institute China Southern Power Grid National Energy Power Grid Technology R&d Centre Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China Csg Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (纸本)9798350300222

As the high-quality flexible resource of the grid, electric vehicles (EVs) can provide multiple auxiliary services for the grid at the same time. However, due to the one-way charging and discharging of EVs, as well as the limitation of power and capacity, which may cause availability conflicts when EVs participate in different auxiliary services simultaneously. This paper focuses on the analysis of the conflict mechanism of EVs participating in the secondary frequency regulation and peak shaving ancillary services at the same time. The impact mechanism between different auxiliary services in this conflict mode is revealed from the two aspects of limit conflict and charging and discharging instruction conflict, and the results of availability conflict of the two types of auxiliary services are verified and analyzed through simulation examples. © 2023 IEEE.

关键词： Frequency modulation

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Performance Evaluation of Component-based Mobile Charging and Discharging Facilities Based on Game Theory-Combinatorial Affiliation Functions 5

Performance Evaluation of Component-based Mobile Charging an...

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5th IEEE International Conference on Advanced Electrical and Energy systems, AEES 2024

作者： Xia, Hua Yang, Chen Zhang, Jianzhou Huang, Xiaoqing NARI Nanjing Control System Co. Ltd. Nanjing China State Grid Electric Power Research Institute Co. Ltd. Nanjing China Hunan University School of Electrical and Information Engineering Changsha China

ISBN: (纸本)9798331517724

With the rapid development of new energy vehicles, an increase in user charging demand has been observed, but the speed of charging pile input has not kept pace with the scale of electric vehicle development. This has led to an increasingly prominent contradiction in charging supply and demand both regionally and temporally. For example, in the service areas of highways, there are fewer charging vehicles on weekdays and not enough piles on holidays. The operational reliability of component-based mobile charging and discharging facilities directly affects the ability to cope with the imbalance in the spatial and temporal distribution of charging demand. Consequently, a performance evaluation method for component-based mobile charging and discharging facilities is proposed. The technical standards of non-vehicle-mounted chargers and dischargers for electric vehicles are analyzed, and a performance evaluation index system for component-based mobile charging and discharging facilities is constructed. The NASH equilibrium game strategy is applied to the combination assignment to obtain the optimal weight allocation coefficients. Subsequently, a combined affiliation function is established to match the actual performance distribution of charging facilities. Finally, the performance evaluation of the charging facilities is conducted, and the results demonstrate that the proposed method aligns more closely with the actual operation state than the traditional comprehensive evaluation method, thereby verifying the reliability and practicability of the method. © 2024 IEEE.

关键词： Piles

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Adaptive Parametric Impedance Model Order Reduction Method for Grid-tied Renewable Energy Dominated Microgrid

Adaptive Parametric Impedance Model Order Reduction Method f...

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2024 International Exhibition and Conference for power Electronics, Intelligent Motion, Renewable Energy and Energy Management, PCIM Asia 2024

作者： Jiang, Xun Mao, Meiqin Xie, Bao Chang, Liuchen Wang, Haijiao Research Center for Photovoltaic System Engineering of Ministry of Education Hefei University of Technology China University of New Brunswick Canada State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute China

ISBN: (纸本)9783800764150

The high-precision reduced order impedance model can significantly reduce the computation burden in the small-signal oscillatory instability detection process of grid-tied renewable energy dominated microgrids (REMGs). However, due to improper interpolation strategies, the existing model order reduction method cannot build the high-precision parametric reduced order impedance model (PROIM) for REMG. To fill these gaps, this paper proposes the adaptive parametric model order reduction method to build a high-precision PROIM for REMGs. In this method, the adaptive optimization of system parameters and frequency interpolation points is achieved by introducing the evaluation indexes including convergence error, cumulative error, and projection matrix rank. The error performance of the obtained PROIM by the proposed method and its efficiency in actual oscillatory stability analysis are validated by a small-scale REMG with 4 different converter-based renewable generators (CREGs) and a real-time simulation model using a large-scale REMG of 4.2 MW with 18 different CREGs. © VDE VERLAG GMBH.

关键词： Microgrids

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Study on partial discharge of transformer based on wide frequency equivalent circuit 8

Study on partial discharge of transformer based on wide freq...

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8th IEEE International Conference on Energy Internet, ICEI 2024

作者： Jiang, Changming Zhou, Yuanxiang Li, Ping Tang, Yunpeng He, Zhiyang Li, Huan Chen, Jianning Mu, Ka State Grid Corporation of China North China Branch Bejing China Tsinghua University State Key Laboratory of Power System Operation and Control Department of Electrical Engineering Bejing China State Grid Corporation of China Bejing China Electric Power Research Institute of State Grid Jibei Electric Power Company Limited Bejing China

ISBN: (纸本)9798331523558

When partial discharge occurs in the transformer, it will produce higher frequency pulse current, high frequency phenomenon will enhance the circuit capacitance effect, making the circuit bandwidth, in order to detect the local discharge signal so as to realize the transformer for equipment monitoring, the establishment of the transformer broadband equivalent circuit model, the propagation law of partial discharge pulse current signal in the transformer is investigated, and the effects of four denoising methods are compared under different evaluation indexes;finally, a typical transformer partial discharge condition is studied, and the validity of the transformer partial discharge research based on the wide-band equivalent circuit is verified. © 2024 IEEE.

关键词： Partial discharges

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