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第42届中国控制会议

作者： Zihan Zhang Zhongwei Lin Ze Zhao Jiawei Zhou Chenzhi Qu State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control and Computer Engineering North China Electric Power University

This paper investigates the operational strategy for real-time optimal active power control of large-scale wind-PV-battery hybrid system. The MPC strategy is established with objective, forecast models and constraints for active power control of wind-PV-battery hybrid system, which simultaneously maximizes tracking accuracy and minimizes settling time. To guarantee the industrial reliability, the corresponding optimization solver and control architecture have been specifically developed and designed. Hardware-in-loop(HIL) experiments are conducted using the real-time digital simulator(RTDS) and programmable logic controllers(PLCs). Under different operating scenarios, HIL-RTDS testing results demonstrate that the MPC strategy significantly improves the tracking speed and accuracy compared to the conventional strategy in both normal and abnormal operating scenarios, which also sustain the feasibility of industrial implementation.

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A LiDAR-assist Yaw Misalignment Compensation Method based on Machine Learning Algorithms

A LiDAR-assist Yaw Misalignment Compensation Method based on...

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第42届中国控制会议

作者： Pei Chen Zhongwei Lin Zihan Zhang Zhen Xie State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control and Computer EngineeringNorth China Electric Power University

Yaw misalignment is common in the yaw system control of wind turbines,resulting in reduced power generation efficiency and increased *** advantage of LiDAR is that the accuracy of wind measurement is greatly improved,while its disadvantage is that the cost remains *** this paper,an efficient machine learning method for estimating LiDAR measurement,XGBoost,is used to establish the data-driven wind turbine yaw misalignment compensation *** choose a suitable algorithm,four machine learning algorithms are studied,namely Linear Regression,Random Forest,Gradient Boosting and ***,to verify the effectiveness of the proposed method,a 2 MW WT was taken as the research object for filed testing,and the power generation was quantitatively evaluated under the three strategies of wind vane control,LiDAR control and ML algorithm *** results show that the proposed yaw misalignment compensation method is feasible for field *** this way,the yaw-to-wind error can be mitigated even after the LiDAR is removed.

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On the crashworthiness of aperiodic chiral mechanical metamaterials: Design and modeling method

On the crashworthiness of aperiodic chiral mechanical metama...

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Chinese Materials Conference 2022-2023

作者： Xu, Weiyun Zhang, Hanyu Liu, Zhao Zhu, Ping The State Key Laboratory of Mechanical System and Vibration National Engineering Research Center of Automotive Power and Intelligent Control School of Mechanical Engineering Shanghai Jiao Tong University Shanghai China School of Design Shanghai Jiao Tong University Shanghai China

Chiral mechanical metamaterial has become topical in energy absorption for the unusual compression-to-twist deformation determined by the asymmetric chirality geometry of their microstructures. However, the insufficient research on the dynamic crash behavior with high nonlinearity and the lack of efficient design and modeling method have blocked the development of chiral mechanical metamaterials considering crashworthiness. In this work, the structure-property relationship of chiral mechanical metamaterials under medium-strain-rate impact was systematically investigated. We proposed an aperiodic framework considering additive manufacturing which enabled both the ordered and disordered chiral mechanical metamaterials utilizing a screw-theory-based assembly rule. The strut components had variable cross-sections and the joints were fillet-enhanced in order to improve the compressive performance. Meanwhile, the corresponding efficient modeling method for finite element analysis (FEA) was introduced. The constitutive relation, damage criteria, and damage revolution of the 316L stainless steel were established considering strain rate effect. Finally, the deformation mechanisms and energy absorbing capabilities of the proposed chiral mechanical metamaterials were demonstrated and discussed based on the mechanical behaviors and the proposed chirality indexes. The numerical results indicated that the proposed design and modeling method provided an effective paradigm for the crashworthiness design of light-weight materials and structures, facilitating the further applications in fields of automobile, civil engineering, aerospace, etc. © Published under licence by IOP Publishing Ltd.

关键词： Metamaterials

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Development of an Impedance Model Identification Device for Renewable Generators 18

Development of an Impedance Model Identification Device for ...

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18th International Conference on AC and DC power Transmission, ACDC 2022

作者： Wu, Chen Liu, Wei Xie, Yigong Xie, Xiaorong Huang, Wei Zheng, Chao Dong, Wenkai Planning and Construction Research Center of Yunnan Power Grid Co. Ltd. Kunming650011 China State Key Laboratory of Power System Department of Electrical Engineering Tsinghua University Beijing China Yunnan Electric Power Dispatching & Control Center Kunming650011 China

ISBN: (数字)9781839537615

ISBN: (纸本)9781839537615

Recently, with the rapid deployment of renewables such as wind and solar photovoltaic, wide-band oscillations have emerged gradually, which have brought out a serious threat to the stability of the power system. To deal with such oscillation issues, the impedance model method is extensively adopted. However, the existing method for the impedance model identification (IMI) is mainly applied to the electromagnetic transient models of the renewable generators (RGs), which may deviate from the actual operation. In this paper, an IMI device is developed, which can be used to identify the impedance model of the actual RGs. Firstly, the main structure and principle of the developed IMI device are introduced. Then, based on the device, an IMI platform is further constructed. Finally, the impedance model of the direct-drive and double-fed wind turbine generators (WTGs) is obtained based on the developed IMI device and platform, and according to the impedance models, the characteristics of the two types of the WTGs are analysed. © ACDC 2022. All rights reserved.

关键词： Wind Turbine Generators

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Virtual Inertia control Strategy for Photovoltaic power Generation Based on Improved Incremental Conductance Method 7

Virtual Inertia Control Strategy for Photovoltaic Power Gene...

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7th Asia Conference on power and Electrical Engineering, ACPEE 2022

作者： Gao, Zhimin Cao, Yongji Zhang, Hengxu Qin, Hao Yang, Dong Ma, Huan Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Jinan China Technical University of Denmark Department of Electrical Engineering Kgs. Lyngby Denmark Institute State Grid Shandong Electric Power Company State Grid Shandong Electric Power Research Jinan China

ISBN: (纸本)9781665418195

The large-scale integration of renewable energy units such as wind and photovoltaic power has greatly reduced the equivalent rotational inertia of the power system. PV arrays are static generating elements and have no inertial response without additional control. In order to improve the stability of renewable energy grid operation, this paper proposes a virtual inertia control strategy for photovoltaic power generation by improving the incremental conductance method. This paper firstly introduces the working principle and model of the PV array, and then improves the incremental conductance method based on PI controller to propose PV power generation power reserve control strategy. The PV output is changed for inertial support based on droop control and virtual inertia control by detecting grid frequency changes. simulation results show that this control strategy results in a better inertial response of the photovoltaic power system. © 2022 IEEE.

关键词： power control

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Optimal Economic Dispatch Strategy for Microgrids Considering Distributed Energy Storage Aggregation

Optimal Economic Dispatch Strategy for Microgrids Considerin...

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IEEE Student Conference on Electric Machines and systems

作者： Changtao Kan Xin Luo Shuang Liang State Grid Jinan Power Supply Company Jinan China State Grid Shandong Electric Power Company Maintenance Company Jinan China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

ISBN: (数字)9798350366945

ISBN: (纸本)9798350366952

User-side distributed energy storage, as a flexible demand response resource, possesses excellent source-load interaction characteristics and can effectively interact with the power grid. However, currently in China, user-side distributed energy storage resources often face difficulties in directly participating in grid regulation due to factors such as dispersed geographical distribution, small individual installed capacity, and uncertain output time. To address this issue, this paper proposes an optimal economic dispatch strategy for microgrids that considers distributed energy storage aggregation. First, a distributed energy storage aggregator is introduced to manage scattered user-side distributed energy storage resources in a scaled manner, and the scheduling potential of distributed energy storage in each time period is assessed based on consumer psychology theory. Subsequently, a multi-objective optimal dispatch model for microgrids is constructed, which takes into account both economic and environmental aspects. The multi-objective optimization problem is transformed into a single-objective optimization problem using the weighted assignment method, and the CPLEX solver is employed to solve the problem. Finally, the effectiveness and feasibility of the proposed method in this paper are verified through a microgrid test system.

关键词： Economics Electric machines Psychology Microgrids Regulation Demand response Optimization Faces Energy storage

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Bismuth oxide based composite cathode for the intermediate temperature barrier layer free solid oxide fuel cell

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International Journal of Hydrogen Energy 2025年 141卷 13-23页

作者： Xiaoyu Wang Yongliang Zhang Tatsuya Kawada Minfang Han Fuel Cell and Energy Storage Innovation Research Center Department of Energy and Power Engineering State Key Laboratory of Power System Operation and Control Tsinghua University Beijing 100084 PR China Graduate School of Environmental Studies Tohoku University Sendai 980-8579 Japan

The high cost and low reliability caused by the high operation temperature hinder the further commercialization of the solid oxide fuel cell (SOFC) at this stage. Thus, lowering the operation temperature and simplifying the structure of the SOFC are both considered to be effective solutions to solve the current issues. Here, the design, fabrication and actual effect of the La 0 · 8 Sr 0 · 2 MnO 3 -(Bi 0 · 75 Y 0.25 ) 0.93 Ce 0 · 07 O 1.5±δ (LSM-BYC) cathode and La 0 · 8 Sr 0 · 2 MnO 3 @(Bi 0 · 75 Y 0.25 ) 0.93 Ce 0 · 07 O 1.5±δ (LSM@BYC) cathode used for the intermediate temperature barrier layer free SOFC are reported. The results showed that tight interfaces between the abovementioned two composite cathodes and the Y 0 · 16 Zr 0 · 84 O 2-δ (YSZ) electrolyte can be formed by sintering at 800 °C. The higher oxygen ion conductivity and oxygen reaction activity of the LSM-BYC cathode and the LSM@BYC cathode, and much simplified structure of the barrier layer free SOFC all contributed to lowering the ohmic resistance and the polarization resistance, making barrier layer free SOFCs used LSM-BYC cathode and LSM@BYC cathode showed better electrochemical performances at intermediate operation temperature 650 °C from low oxygen partial pressure atmosphere to pure oxygen atmosphere, particularly the latter. What is more, the intermediate temperature barrier layer free SOFC used the LSM-BYC cathode showed better operation stability without obvious activation and degradation during the constant electric current generation over one hundred hours. But the deterioration of the interface between the LSM@BYC cathode and the YSZ electrolyte during the operation was likely to cause the sharp decrease of the electrochemical performance, the solutions of which still need further exploration.

关键词： Solid oxide fuel cell Bismuth oxide Composite cathode Mechanical mixing Infiltration Oxygen partial pressure

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The Commonality of Economic Dispatch Models Based on Scenario/Interval 7

The Commonality of Economic Dispatch Models Based on Scenari...

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7th IEEE Conference on Energy Internet and Energy system Integration, EI2 2023

作者： Wang, Yishen Wei, Renjie Sun, Fengbin Zhang, Ruihan Yao, Tiechui Ren, Lan State Grid Smart Grid Research Institute Co Ltd Future Science Park Beijing China State Grid Smart Grid Research Institute Co Ltd Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Jinan China

ISBN: (纸本)9798350345094

With the increasing penetration of renewable energy, how to maximize the acceptance of renewable energy on the basis of satisfying the economy security and reliability of the power system is an urgent problem to be solved. In this area, mathematical optimization methods such as robust optimization and stochastic optimization are generally used to construct models based on different uncertainty descriptions. Previous studies have shown that robust optimization has high computational efficiency but conservative results, while stochastic optimization has low computational efficiency but accurate results. Therefore, different studies will choose suitable methods based on the characteristics of the models to be constructed. However, existing studies have not thoroughly discussed whether there is a connection between the two methods. This paper first proposes an economic dispatch model based on scenario considering the admissible region of net load, and introduces a new affine strategy to transform this model into a deterministic form. Secondly, based on further exploration of the characteristics of economic dispatch models based on scenario/interval, the paper concludes that the two models are common when they are sufficiently precise. Finally, the correctness of the conclusion is verified on the IEEE-RTS system. © 2023 IEEE.

关键词： Computational efficiency

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Synergistic Optimization of power & Capacity Configuration Considering control Strategy for Flywheel Energy Storage Participating in Primary Frequency Regulation

SSRN

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SSRN 2024年

作者： Liang, Lu Hong, Feng Ji, Weiming Jiang, Hui Hao, Junhong Fang, Fang Liu, Jizhen The State Key Laboratory of Alternate Electric Power System with Renewable Energy Sources North China Electric Power University Beijing102206 China School of Control and Computer Engineering North China Electric Power University Beijing102206 China Key Laboratory of Power Station Energy Transfer Conversion and System of Ministry of Education School of Energy Power and Mechanical Engineering North China Electric Power University Beijing102206 China

The intermittent and stochastic nature of renewable energy sources poses stern challenges to the frequency stability of new power system. The flywheel energy storage system (FESS), with its rapid response and high power density, plays a pivotal role in mitigating frequency fluctuations. To improve the performance of the FESS assisting thermal power unit (TPU), a collaborative optimization methodology of the capacity configuration and control strategy for FESS is presented in this paper. Aiming to enhance the primary frequency control (PFC) performance and reduce the life-cycle cost of the FESS, this paper established a capacity configuration model based on a dynamic adaptive control strategy, in which FESS compensates for the lack of TPU frequency regulation capability and recovery SOC actively. A case study demonstrated that the optimization model proposed is suitable for different frequency scenarios. It has been verified that the control strategy which is based on the SOC of FESS and frequency regulation capability of the TPU is economically more attractive compared to traditional strategies. In addition, this study revealed that a FESS with a charge/discharge rate of 7.5 C and rated power of 7.6 MW was appropriate for assisting a 600MW TPU in PFC by the optimal capacity configuration and control strategy. © 2024, The Authors. All rights reserved.

关键词： Wheels

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Enhancing power system Stability: A Machine Learning Approach with SVM, Random Forest and Deep Learning Utilizing Wide Area Measurements 7

Enhancing Power System Stability: A Machine Learning Approac...

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7th IEEE Student Conference on Electric Machines and systems, SCEMS 2024

作者： Song, Chao Tan, Mengcan Chu, Mingzhao Zhou, Chihan Tian, Guojie Mu, Longfei Shandong Future Intelligent Technology Co. Ltd Shandong Electrical Engineering & Equipment Group Co. Ltd Jinan China Fengtai Supply Company Distribution Operation and Maintenance Center State Grid Beijing Electric Power Company Beijing China State Grid Shandong Electric Power Company Changyi Supply Company Marketing Department Changyi China State Grid Kunming Power Supply Company Kunming China Shandong Tianyu Changtong Energy Group Co. Ltd. Qingdao China Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan China

ISBN: (纸本)9798350366945

As the scale and complexity of modern power systems continue to expand, the importance of system stability has become increasingly critical. To ensure the stable operation of the power system, this paper proposes a power system stability analysis and optimal control strategy based on the Wide Area Measurement system (WAMS). Initially, a novel stability evaluation method is established using WAMS data and machine learning techniques, enabling effective handling of complex power system data and providing accurate stability assessments. Following this, an optimal control strategy is designed based on the evaluation method, aimed at real-time adjustments of power resource allocation to enhance system stability and responsiveness. simulation analyses confirm the effectiveness and reliability of the proposed approach, indicating that the optimized control strategy significantly improves the system's performance under disturbances. This paper presents an innovative method for the stable operation of integrated power systems, contributing to the enhancement of power supply quality within the grid and ensuring the safe and efficient operation of the overall power system. © 2024 IEEE.

关键词： control system stability

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