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Electrical Engineering and Automation (IFEEA), International Forum on

作者： Yihua Zhu Yun Hu Liang Tu Mingzhang Su Chao Luo State Key Laboratory of HVDC Electric Power Research Institute CSG Guangzhou China 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

This paper establishes simulation modeling for large-scale grid connected wind power with energy storage system (ESS). The conventional grid-following (GFL) based ESS is used as a reference object to test the active support performance of large-scale grid-connected wind power with grid-forming (GFM) based ESS with active support performance evaluation indices in different scenarios. (1) Small disturbance evaluation indices: The point of common coupling (PCC) frequency/voltage drop depth and recovery time. (2) Large disturbance evaluation indices: The PCC frequency/voltage drop depth and rise height after fault removal. The output active/reactive power drop depth and rise height/recovery time after fault removal. (3) Island capability evaluation indices: The PCC frequency/voltage fluctuation amplitude at the moment of switching and system stability after switching.

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Performance Analysis of the Modified Flux-Coupling-Type SFCL in VSC-HVdC system

Performance Analysis of the Modified Flux-Coupling-Type SFCL...

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Iranian Conference on Electrical Engineering (ICEE)

作者： Mohammad Khakroei Ashkan Mirzaei rajeooni Mahdi rahimi Pirbasti Hossein Heydari MAPNA Electric & Control Engineering & Manufacturing Company (MECO) Alborz Iran Department of Engineering and R&D MAPNA Generator Engineering and Manufacturing Company (PARS) Alborz Iran Department of Electrical Engineering (Center of Excellence for Power System Automation and Operation) Iran University of Science and Technology (IUST) Tehran Iran

Although Voltage Source Converters based on HVdC (VSC-HVdC) systems have several advantages, they are vulnerable to dC fault currents. Concerning the inherent characteristics of high-temperature superconducting (HTS) material, using HTS in the fault current limiter could be a solution to limit the current in VSC-HVdC. The present paper seeks to provide an elaborately better solution to the problem mentioned above of the fault currents than what has previously been proposed. The object of this research is a modified flux coupling type superconductor fault current limiter (MFC-SFCL) to attenuate the fault current in VSC-HVdC network. The principle mechanism and operation of the SFCL and VSC-HVdC systems are modeled in detail, involving interplay or synergy between electrical and thermal properties. The simulation results demonstrate that the purposed MFC-SFCL has the proper function to mitigate the fault current.

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Comparison and Testing of Equivalent Modeling Methods for Wind Farm Composed of doubly-Fed Induction Generators

Comparison and Testing of Equivalent Modeling Methods for Wi...

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

作者： Binjiang Hu Yihua Zhu Liang Tu Zun Ma Xian Meng Chao Xing State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China National Energy Power Grid Technology R&D Centre Guangzhou China Electric Power Research Institute of Yunnan Power Grid Co. Ltd. Kunming China

ISBN: (数字)9798331523527

ISBN: (纸本)9798331523534

For analyzing the power system with high penetration of wind power, it is important to establish accurate models of wind turbines and wind farms, which is a basic and important work. In the analysis of wind power grid integration, it is necessary to aggregate the equivalent value of the wind farm into one or a few wind turbines. At present, there are two commonly used equivalence methods: current source multiplication (commonly used in commercial software) and full dynamic aggregation method. The former achieves wind farm equivalence by multiplying the output current of a single wind turbine generator, while the latter dynamically aggregates the wind farm into one or several large wind turbine generators. There is still a lack of research on the differences between the two. Based on the actual wind farm structure, this paper studies the electrical characteristics of steady-state operation and transient fault ride through operation using single machine dynamic aggregation method and current source multiplication method separately, and compares the equivalent simulation results with the detailed wind farm simulation results. The equivalent accuracy of the single machine aggregation method and the current source multiplication method is calculated to provide a reference for method selection in wind farm equivalent modeling.

关键词： reactive power Accuracy Simulation Power system dynamics doubly fed induction generators Wind farms Generators Wind turbines Impedance Transient analysis

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An end-edge-cloud technology architecture for integrated intelligent control of small hydropower - an example from Hunan Province, China 10

An end-edge-cloud technology architecture for integrated int...

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10th International Forum on Electrical Engineering and Automation, IFEEA 2023

作者： Zhou, Zhuomin Liang, Jian Yu, Aiqin Qin, Zhengbin Liu, Haotian Sheng, Yanchao Guo, Wei State Grid Hunan Electric Power Company Limited Hunan Key Laboratory of Energy Internet Supply Demand and Operation Development Planning Department Changsha China State Grid Hunan Electric Power Company Limited Institute of Economic Research Hunan Key Laboratory of Energy Internet Supply Demand and Operation Changsha China State Grid Xiangtan Electric Power Company Limited Institute of Economic Research Changsha China Three Gorges Intelligent Industrial Control Technology Co. Ltd. R&d Department Wuhan China

ISBN: (纸本)9798350309379

The main technical issues for small hydropower currently are aging equipment and insufficient intelligence level, which cannot effectively support the development of new power systems. To solve this problem, this paper proposes an end-edge-cloud technology architecture for intelligent control of small hydropower. Specifically, an intelligent sensing architecture for small hydropower units is proposed, which can fully sense the operating conditions of small hydropower units. An edge computing PLC with IOT functions is proposed, which can effectively integrate the speed regulation, excitation, monitoring and protection algorithms of small hydropower units, and can greatly simplify the complexity of control systems. At the same time, the edge computing PLC transmits the on-site operation data to the cloud platform through high-density compression transmission, and uses big data analysis and processing technology to realize centralized monitoring and remote operation and maintenance of small hydropower stations within the province. Finally, the intelligent sensing, integrated edge control device and cloud platform proposed in this paper are technologically verified at a small hydropower station in Jingshan reservoir, and the results fully demonstrate the effectiveness of this technical architecture. © 2023 IEEE.

关键词： control end-edge-cloud technology architecture IOT-PLC small hydropowert

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Comparison and Testing of Equivalent Modeling Methods for Wind Farm Composed of doubly-Fed Induction Generators 8

Comparison and Testing of Equivalent Modeling Methods for Wi...

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8th IEEE Conference on Energy Internet and Energy system Integration, EI2 2024

作者： Hu, Binjiang Zhu, Yihua Tu, Liang Ma, Zun Meng, Xian Xing, Chao China Southern Power Grid State Key Laboratory of Hvdc Electric Power Research Institute Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China National Energy Power Grid Technology R&d Centre Guangzhou China Electric Power Research Institute Yunnan Power Grid Co. Ltd. Kunming China

ISBN: (纸本)9798331523527

关键词： Wind Turbine Generators

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A Transient Voltage Stability Preventive control Strategy for dC receiving-end Power system

A Transient Voltage Stability Preventive Control Strategy fo...

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IEEE International Conference on Power and Power and renewable Energy (ICPrE)

作者： Lian Tu Shuiping Zhang Hengdao Guo Bo Bao Yihua Zhu Jian Zuo China Southern Power Grid Power Dispatch and Control Center of Guangdong Power Grid Co. Ltd China China Southern Power Grid State Key Laboratory of HVDC Electric Power Research Institute China National Energy Power Grid Technology R&D Centre China Operation and Control for New Energy Power System Guangdong Provincial Key Laboratory of Intelligent China

With the increase of dC feed power and the decrease of the number of synchronous machines, receiving-end power system takes a serious threat to the transient voltage stability. Therefore, a transient voltage stability preventive control strategy for dC receiving-end power system is proposed in this paper. The whole method is decomposed into three sub-problems: transient voltage stability assessment, sensitivity computation and optimal control. A transient voltage stability index suitable for the sensitivity method is used to construct the transient voltage stability constraints. The accuracy and efficiency of the solution algorithm are improved by limiting the effective control interval of sensitivity and selection of the initial control set. The method has been applied in a provincial power grid in southern China. The results verifies the effectiveness of the proposed method.

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GPU-Accelerated Policy Optimization via Batch Automatic differentiation of Gaussian Processes for real-World control

arXiv

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arXiv 2022年

作者： Taheri, Abdolreza Pajarinen, Joni Ghabcheloo, reza Faculty of Engineering and Natural Sciences Tampere University Finland Department of Electrical Engineering and Automation Aalto University Finland Intelligent Autonomous Systems TU Darmstadt Germany Control Systems R&D HIAB Sweden

The ability of Gaussian processes (GPs) to predict the behavior of dynamical systems as a more sample-efficient alternative to parametric models seems promising for real-world robotics research. However, the computational complexity of GPs has made policy search a highly time and memory consuming process that has not been able to scale to larger problems. In this work, we develop a policy optimization method by leveraging fast predictive sampling methods to process batches of trajectories in every forward pass, and compute gradient updates over policy parameters by automatic differentiation of Monte Carlo evaluations, all on GPU. We demonstrate the effectiveness of our approach in training policies on a set of reference-tracking control experiments with a heavy-duty machine. Benchmark results show a significant speedup over exact methods and showcase the scalability of our method to larger policy networks, longer horizons, and up to thousands of trajectories with a sublinear drop in speed. © 2022, CC BY-NC-Nd.

关键词： Gaussian distribution

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Active Thermal control of Grid-Forming Converters Based on dC-link Voltage Synchronization

Active Thermal Control of Grid-Forming Converters Based on D...

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IEEE International Conference on Power and Power and renewable Energy (ICPrE)

作者： Mingqun Liu Guanming Zeng Xin He Liang Tu Peng He Yihua Zhu Electric Power Research Institute Yunnan Power Grid Co. Ltd. Kunming Yunnan 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 State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid National Energy Power Grid Technology R&D Centre Guangzhou China

ISBN: (数字)9798350377460

ISBN: (纸本)9798350377477

Grid-forming control, as a key technology for building new power systems, enables inertia and damping characteristics of converters to actively support grid frequency and voltage. However, GFM-based converters are often required to generate short-circuit currents in excess of the rated value to support grid voltage recovery during transient faults, which poses a greater challenge to their electro-thermal stresses. At the same time, the over-issuance of short-circuit current will lead to the aggravation of junction temperature fluctuation, which will shorten the lifetime of the power devices and bring new challenges to their reliability. Based on the above problems, this paper firstly establishes a corresponding electrothermal coupling model for the GFM converter synchronized based on dC voltage. Subsequently, an active thermal control technique based on the adaptive adjustment of switching frequency is proposed, which can not only reduce the junction temperature of the power device under the same short-circuit current amplitude, but also further reduce the junction temperature fluctuation of the power device. Finally, the corresponding circuit as well as thermal circuit models are established by simulation software to verify the effectiveness of the strategy.

关键词： Adaptation models Fluctuations Switching frequency Short-circuit currents control systems Temperature control Junctions Transient analysis Voltage control Grid forming

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research on Wind Turbine control Hardware in Loop real-time Simulation and its Application

Research on Wind Turbine Control Hardware in Loop Real-time ...

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Sustainable Power and Energy Conference (iSPEC)

作者： Guanming Zeng Liang Tu Yihua Zhu Chengxiang Li Mingqun Liu Peng He State Key Laboratory of HVDC and CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid and National Energy Power Grid Technology R&D Centre and Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou Guangdong Yunnan Power Grid Co. Ltd. Electric Power Research Institute Kunming Yunnan

With the construction of new power system, high-capacity renewable energy sources including wind power are integrated into the power system, whose transient response characteristics have a significant impact on the safe and stable operation of both renewable energy sources and power system. real-time simulation has become an effective method to study interaction between high-capacity renewable energy sources and power system because of its high accuracy and reliability, and precise wind turbine real-time simulation model is of great significance in research mentioned above. Therefore, the wind turbine control hardware in loop (CHIL) real-time simulation method is proposed in the paper, whose feasibility and accuracy are also verified by comparing simulation data from CHIL platform and on-site testing data. It’s further used in the analysis of large-scale offshore wind farm cluster and connected power system as a practical reference case.

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research on Active Support control Strategy and its Performance of renewable Energy Power Station with Multiple Energy Sources

Research on Active Support Control Strategy and its Performa...

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

作者： Guanming Zeng Liang Tu Yihua Zhu Yun Hu Chao Luo Shengnan Li 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 CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China National Energy Power Grid Technology R&D Centre Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China Yunnan Power Grid Co. Ltd. Electric Power Research Institute Kunming Yunnan

The increasing integration of renewable energy reduces the inertia and frequency support capacity of the power system. The issue of frequency stability has become one of the core issues in the security and stability of power system and the efficient consumption of renewable energy nowadays. To improve the performance of renewable energy power station (rEPS), based on the analysis of typical active support control logic and relative performance requirements of rEPS with single energy source (SES), an active support control strategy and coordinated control logic of active power of rEPS with multiple energy sources (MES) are proposed in this paper. The performance of proposed strategy is theoretically analyzed from the aspect of dominant energy source and the effect of the capacity of energy storage. The effectiveness of the proposed strategy and the accuracy of the theoretical analysis of performance are verified by realtime simulation.

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