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2021 International Conference on power system Technology, powerCON 2021

作者： Chen, Yong Chang, Dongxu Zhu, Yihua Zhu, Yukun Guo, Hengdao Li, Shengnan Electric Power Research Institute Ltd. of Yunnan Power Grid Co. KunMing China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China China Southern Power Grid State Key Laboratory of HVDC Electric Power Research Institute Guangzhou China

ISBN: (纸本)9781665407373

The power flow distribution of the GuangxiGuangdong AC transmission section (GX-GD section) has changed greatly as Kunliulong and Lugaozhao three-terminal HVDC projects have been put into operation, and it is necessary to study on the adaptability of out-of-step separation devices. Based on the real primary system, an equivalent system model is proposed in this paper which can accurately locate the oscillation center and calculate the minimum voltage at the measuring point. Dynamic real-time simulation is carried out for various types and different principles of out-of-step separation devices. Typical problems such as unreliable out-of-step locking criterion in the fault process and device refusing to move when the oscillation center is located at the device installation point are found and solved At the same time, based on the power grid panoramic simulation test technology and the actual configuration of out-of-step separation devices, the problems in the coordination of out-of-step devices near the GX-GD section are comprehensively studied, and the suggestions of putting the wide area out-of-step separation system into operation as soon as possible are put forward. The improvement and optimization measures proposed in this paper have been applied in the real system. © 2021 IEEE.

关键词： Electric load flow

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

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

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HVDC (HVDC), International Conference on

作者： Renxin Yang Haiqing Cai Mingzhang Su Haohan Gu Zhihao Chen Xu Cai Key Laboratory of Control of Power Transmission and Conversion Shanghai Jiao Tong University Shanghai China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid 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: (数字)9798350387759

ISBN: (纸本)9798350387766

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.

关键词： Renewable energy sources simulation HVDC transmission Capacitors Rotors Switches control systems Synchronous generators Stability analysis Grid forming

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A Novel DC control Optimization Strategy for Supporting Transient Voltage of HVDC Sending End system

A Novel DC Control Optimization Strategy for Supporting Tran...

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IEEE International Conference on power and power and Renewable Energy (ICPRE)

作者： Qingxi Duan Yanhui Qin Zhen Liu Yu Duan Zimin Zhu Xiaoyun Wang Xing Ma Weihong Zao Xinjiang Electric Power Research Institute Xinjiang Key Laboratory of Whole Process Simulation for Power System State Grid Xinjiang Electric Power Co. Ltd. Urumqi China

In view of the transient voltage problem caused by the fault occurred in the sending end AC system. This paper analyzes the interaction of reactive power between AC and DC systems, and the dominant factors affecting transient voltage was identified. Considering the fault severity, the expression of transient voltage of converter bus is established in this paper. Based on this, the expression of DC current command value is derived, and the DC control optimization strategy is proposed to support the transient voltage. Finally, a test model is built based on the CIGRE HVDC benchmark model in the PSCAD/EMTDC, and the validity of the proposed strategy is verified by simulation results.

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Dynamic Stability Analysis of Renewable power systems Considering Cluster Effect of Multiple Photovoltaic Generators with Same Dynamics

Dynamic Stability Analysis of Renewable Power Systems Consid...

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Frontiers of power and Energy (ACFPE), Asian Conference on

作者： Zimin Zhu Xiaofang Wu Yu Duan Zhen Liu Dongliang Nan Peili Liu Electric Power Research Institute State Grid Xinjiang Electric Power Co. Ltd. Xinjiang Key Laboratory of Whole Process Simulation for Power System Urumqi China College of Electrical Engineering Sichuan University Chengdu China

ISBN: (数字)9798350367676

ISBN: (纸本)9798350378467

Dynamic stability issues posed by large-scale photovoltaic (PV) generation can jeopardize the secure operation of renewable power systems. This paper establishes a PV solar farm equivalent model that considers the cluster effect of multiple PV generators with same dynamics. Mathematical analysis indicates that the dynamic characteristics of PV generators are central to the dynamic instability of large-scale grid-connected PV solar farms. While increasing the scale of PV generators and weakening the AC transmission line connections exacerbate dynamic instability, these factors amplify the effect but are not the root cause. A case study conducted in an actual power system with high PV generation penetration highlights that the phase-locked loop parameters of PV inverters are crucial for triggering oscillations caused by the cluster effect of multiple PV generators with same dynamics. As the number of PV generators increases and the AC transmission line connections weaken, the system’s dynamic stability deteriorates in the specific power system.

关键词： Damping Renewable energy sources power transmission lines power system dynamics Solar farms power system stability Dynamic scheduling Generators Stability analysis Oscillators

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Active and Reactive power Decoupling control Strategy for LCC-HVDC Based on Finite Operation Range

Active and Reactive Power Decoupling Control Strategy for LC...

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power and Electrical Technology Conference (APET), Asia

作者： Qingxi Duan Zhen Liu Yu Duan Xing Ma Zimin Zhu Zhijie Li Xiaoyun Wang Xinjiang Electric Power Research Institute State Grid Xinjiang Electric Power Co. Ltd. Xinjiang Key Laboratory of Whole Process Simulation for Power System Urumqi China

This letter proposes a decoupling control strategy between active power and reactive power in a finite range. Based on the constant current control in the rectifier and constant voltage control in the inverter, the proposed control strategy can adjust the reactive power consumed by the converter under the condition of constant active power at both rectifier and inverter side, and the adjustable range of reactive power is defined. The simulation results verify the effectiveness and correctness of the proposed control strategy.

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Research on applicability of containment test data for HPR1000 based on phenomena scaling

International Journal of Advanced Nuclear Reactor Design and...

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International Journal of Advanced Nuclear Reactor Design and Technology 2025年第2期7卷 120-127页

作者： Liu Yusheng Qiao Xuedong Tan Sichao Jing Jianping Wang Ting Zhu Yuanbing State Environmental Protection Key Laboratory of Nuclear and Radiation Safety Regulatory Simulation and Validation Nuclear and Radiation Safety Center MEE Beijing 100086 China Guangdong Provincial Key Laboratory of Nuclear Power Safety Shenzhen 518026 China Heilongjiang Provincial Key Laboratory of Nuclear Power System & Equipment Harbin Engineering University Harbin 150001 China China Nuclear Power Technology Research Institute Co. Ltd. Shenzhen 518026 China

The volume of the nuclear power plant containment is huge, making it difficult to conduct equal-scale or large-scale thermal-hydraulic tests. Currently the test data mainly come from small-scale tests. To address the applicability of small-scale containment test data in validation process of the containment performance analysis code, the analysis method for applicability of experimental data is proposed and developed on the basis of similarity analysis of the pressure response process in the containment. The applicability study of the test data, which are produced by some scaled containment facilities such as the HDR, Battelle and CVTR, is carried out in combination with the test parameters. The applicability of each test case isobtained respectively when they are applied to validate the containment code in case of the Large Break Loss of Coolant Accident (LBLOCA) and Main Steam Line Break Accident (MSLB) of HPR1000 nuclear power plant. The results show that the similarity criteria for pressure response process and key phenomena within the containment vessel under accident conditions can be employed to analyze the applicability of different containment tests to specified power plant. The test dataoriginating fromHDR ISP-16 and HDR ISP-23can represent the pressure transient process, results of coupling phenomena such as mass and energy release at the break, condensation near the containment shell and internals, within the HPR1000 containment in case of LBLOCA or MSLB. The distortion is either within the acceptable range or conservative for design limits of containment pressure, so that the small-scale containment test data could be suitable for verification and validation of the HPR1000 containment thermal hydraulic response analysis code.

关键词： Containment Similarity analysis Validation Safety analysis Pressure response HPR1000

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A Networked Method Applied to Sensitivity Analysis of a VSG controlled BESS system

A Networked Method Applied to Sensitivity Analysis of a VSG ...

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power Engineering (ICPE), International Conference on

作者： Zhiyuan Sun Chao Luo Kun Zheng Yihua Zhu Jiawei Yu Guangxi Power Grid Electric Power Research Institute China Southern Power Grid Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Nanning China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guang zhou China National Energy Power Grid Technology R&D Centre Guang zhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guang zhou China

ISBN: (数字)9798331531140

ISBN: (纸本)9798331531157

The grid-forming battery energy storage system (BESS) plays important role in constructing new energy system. This paper presents a frequency domain modal-based stability analysis of virtual synchronous generator (VSG) controlled BESS. Both ac and dc side interactive dynamics of the grid-tied inverter system are considered, by establishing a hybrid ac/dc impedance network. Then, the frequency domain modal analysis (FMA) method for networked converter systems is applied to the BESS system, covering the eigen-sensitivity from the node level to parameter level. Using this method, key parameters that influence the BESS system’s weakly/negative damping modes most can be better analyzed and identified. The analysis results are validated via the time-domain simulations.

关键词： Battery energy storage system Sensitivity analysis Frequency-domain analysis Modal analysis Stability analysis Synchronous generators Impedance Time-domain analysis Tuning Grid forming

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Numerical optimization and performance study of a photovoltaic/thermal module based on multi-stage V-type turbulators

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Renewable Energy 2025年 252卷

作者： Zhang, Yong Zhao, Yang Zhang, Heng Cheng, Chao Gao, Dan Chen, Haiping Liu, Jizhen State Key Laboratory of New Energy Power System North China Electric Power University Beijing102206 China School of Energy Power and Mechanical Engineering North China Electric Power University Beijing102206 China Beijing Key Laboratory of Pollutant Monitoring and Control in Thermoelectric Production Process North China Electric Power University Beijing102206 China National Institute of Energy Development Strategy North China Electric Power University Beijing102206 China

The utilization of solar energy is one of the important ways to ensure low-carbon energy transformation, and PV/T technology, as an efficient technology for utilizing solar energy, has received widespread attention in recent years. This paper proposes a photovoltaic/thermal (PV/T) module based on a multi-stage V-type turbulator, and explores the optimization design of the system through numerical simulation and experimental research. To improve thermal and electrical efficiency, the paper integrates a turbulence-enhancing V-type turbulator design and utilizes a Computational Fluid Dynamics (CFD) model for detailed system analysis. Experimental results show that the optimized PV/T system achieves a 9 %–12 % increase in electrical efficiency compared to conventional PV systems under standard solar irradiance conditions, with overall system efficiency exceeding 65 %. Through optimization using the Response Surface Methodology (RSM), the optimal turbulator design parameters were determined to be an angle α of 60°, an inclination angle β of 61.1°and a distance D of 0 mm. This article also compared three conventional channels to verify the heat transfer performance of the multi-stage V-shaped vortex generator PV/T. © 2025

关键词： Heat transfer performance

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Research on Digital Twin Modeling Method for Combustion Process Based on Model Reduction

SSRN

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SSRN 2024年

作者： Zhang, Yue Li, Jiale Department of Automation North China Electric Power University Hebei Baoding071000 China Hebei Technology Innovation Center of Simulation & Optimized Control for Power Generation North China Electric Power University China Baoding Key Laboratory of State Detection and Optimization Regulation for Integrated Energy System China

In response to the difficulty in obtaining combustion information within coal-fired boiler furnaces, a method is proposed in this study to improve the reduced-order model using clustering segmentation. This approach aims to rapidly predict the combustion temperature field inside the furnace by establishing a twin model of the combustion temperature field. Initially, a finite element method is employed to analyze the combustion system of a 600MW subcritical boiler under various operating conditions. Subsequently, cross-sectional data from burner nozzle positions at each operating condition are extracted. These data are subjected to Proper Orthogonal Decomposition (POD), Spectral Proper Orthogonal Decomposition (SPOD), and Wavelet Transform-POD (WT-POD) for dimensionality reduction to obtain modal data. Comparative analyses are conducted on the modal data obtained from different methods. Furthermore, based on modal data analysis, a Support Vector Machine (SVM) regression model is selected to reconstruct the temperature field. The average absolute error of the reconstructed temperature fields from three methods under different operating conditions is then compared. Finally, the model is refined using clustering segmentation, resulting in an improvement of approximately 0.6% in reconstruction accuracy. This enhancement demonstrates that the clustered POD-SVR-GA model achieves higher accuracy in reconstructing combustion temperature fields after clustering-based improvements. © 2024, The Authors. All rights reserved.

关键词： Support vector machines

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Online distributed tracking of generalized Nash equilibrium on physical networks——Closing the Loop via Measurement Feedback

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Autonomous Intelligent systems 2021年第1期1卷 69-80页

作者： Yifan Su Feng Liu Zhaojian Wang Shengwei Mei Qiang Lu The State Key Laboratory of Power System Department of Electrical EngineeringTsinghua UniversityBeijingChina The Key Laboratory of System Control and Information ProcessingMinistry of Education of ChinaDepartment of AutomationShanghai Jiao Tong UniversityShanghaiChina

In generalized Nash equilibrium(GNE)seeking problems over physical networks such as power grids,the enforcement of network constraints and time-varying environment may bring high computational *** online algorithms is recognized as a promising method to cope with this challenge,where the task of computing system states is replaced by directly using measured values from the physical *** this paper,we propose an online distributed algorithm via measurement feedback to track the GNE in a time-varying networked resource sharing *** that some system states are not measurable and measurement noise always exists,a dynamic state estimator is incorporated based on a Kalman filter,rendering a closed-loop dynamics of measurement-feedback driven online *** prove that,with a fixed step size,this online algorithm converges to a neighborhood of the GNE in *** simulations validate the theoretical results.

关键词： Generalized Nash equilibrium Distributed optimization Online optimization Feedback-based optimization state estimation Sharing market

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