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operation Risks Analysis and Stability control system Optimization for the Junction Area of Multiple HVDC Sending system

Operation Risks Analysis and Stability Control System Optimi...

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International Conference on power system Technology (powerCON)

作者： Yukun Zhu Yihua Zhu Dongxu Chang Jiawei Yu Shengnan Li Yong Chen 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 CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China Electric Power Research Institute Yunan Power Grid Co Ltd Kunming China

ISBN: (纸本)9781665407380

The successive commissioning of HVDC projects has enabled many substations or areas to connect with multiple sending ends of HVDC simultaneously, forming a junction area of multiple HVDC sending system. The operation risks in these areas have also changed accordingly. This paper focuses on the safe and stable operation of the junction area of multiple HVDC sending system, analyzing the current operation risks of the junction area and the adaptability of the regional stability control strategies at first. Then, an optimization scheme including regional stability control strategy design and structure configuration for the junction area is put forward, whose feasibility is verified through the stability control system of Huangping area, which is a typical junction area located in the sending ends of Jinguan-Guizhong and Xinsong-Dongfang HVDC. The Successful application in Huangping area also proves that the stability control system optamization scheme for junction area of multiple HVDC sending system proposed in this paper has good completeness and scalability, that is of great significance to the design for the stability control system of similar junction area.

关键词： Substations HVDC transmission systems operation Scalability power system stability control systems Stability analysis

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An Advanced control Strategy for Bidirectional Isolated Three Phase AC/DC Dual-Active-Bridge Converter in Hybrid Microgrid

An Advanced Control Strategy for Bidirectional Isolated Thre...

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

作者： Dongxin Guo Panbao Wang Jiansheng Kong Jinjie Tian Chunguang Ren Xiangqi Meng Yanbing Jia Yue Qin Zeqi Wang Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China Harbin Institute of Technology Harbin China Datong Power Supply Company State Grid Shanxi Electric Power Company Datong China School of Electrical and Power Engineering Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781665434263

This paper proposes an advanced control strategy consisting of current stress optimization based on triple-phase-shifting (TPS) modulation for front-end DAB converter and 33% PWM method for back-end three-phase full bridge inverter. Compared with the traditional phase shift control, the control strategy proposed for the front-end DAB converter achieves linear control and significantly reduces current stress. In addition, it reduces the DC-Link capacitance, which improves the safety of the equipment. The 33% modulation method adopted by the full bridge inverter at the back-end reduces the switching loss of semiconductor devices. The principle, derivation and realization of the proposed control strategy are described in detail. Simulation results are presented to validate the effectiveness of the proposed strategy.

关键词： Solid modeling Phase modulation Switching frequency Bridge circuits Switching loss system integration Capacitance

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Predictive Thrust control Without Optimal Weighting Factor Based on Robust Primary Flux Constraint for Linear Induction Machine 13

Predictive Thrust Control Without Optimal Weighting Factor B...

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13th International Symposium on Linear Drives for Industry Applications, LDIA 2021

作者： Tang, Lei Xu, Wei Wang, Xiaoguang Xiao, Xinyu Dong, Dinghao Zhang, Yunhong School of Electrical Engineering School of Management Xi'an Jiaotong University Xi'an China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China Hubei Key Laboratory for High-Efficiency Utilization of Solar Energy and Operation Control of Energy Storage System Hubei University of Technolog Wuhan China State Grid Chongqing Qinan Electric Power Supply Company Chongqing China

ISBN: (纸本)9781728172101

The model predictive thrust control (MPTC) is recognized as an effective approach for a linear induction machine (LIM). The flexibility of MPTC can achieve more control targets. However, the weighting factors in the multiple control objectives need to be tuned. It can greatly increase the complexity of controller design. Based on the robust primary flux constraint and fuzzy probability, a novel predictive thrust control without optimal weighting factor is proposed in this paper. As a result, weighting factor selection is avoided, which can reduce computation time, and increase dynamic response. At last, the performance of the proposed method has been verified by comprehensive simulation results. © 2021 IEEE

关键词： Model predictive control

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Research on Automatic Construction and Correlation Method of Virtual and Real Loops in UHV DC control and Protection system

Research on Automatic Construction and Correlation Method of...

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Sustainable power and Energy Conference (iSPEC)

作者： Yuanhong Lu Qi Guo Zhijiang Liu Shuyong Li Haiping Guo Guanming Zeng State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid National Energy Power Grid Technology R&D Centre Guangzhou China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System 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 Guangzhou China

ISBN: (纸本)9781665414401

At present, in the research on virtual and real loops of control and protection systems, scholars at home and abroad are mainly focusing on the field of AC digital substations, and there is less research on the virtual and real loops of UHV DC control and protection systems. Aiming at this problem, this paper proposes an automatic construction and correlation method for virtual and real loops of UHV DC control and protection system. This method automatically constructs the real circuit by analyzing the design drawings and the optical cable inventory, analyzing the DC visualization program to automatically construct the virtual circuit, and then automatically correlates the virtual and real circuits based on the graph depth traversal algorithm. The practical application in UHV DC engineering shows that this method can help relevant personnel complete the automatic construction and correlation of virtual and real loops, and improve the convenience of operation and maintenance of the UHV DC control and protection system.

关键词： Visualization Correlation Substations Optical design Conferences Focusing Maintenance engineering

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Adaptability Study on Out-of-Step Separation Devices of Complex Multiinfeed AC/ DC power systems

Adaptability Study on Out-of-Step Separation Devices of Comp...

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International Conference on power system Technology (powerCON)

作者： Yong Chen Dongxu Chang Yihua Zhu Yukun Zhu Hengdao Guo Shengnan Li Electric Power Research Institute Ltd. of Yunnan Power Grid Co. KunMing China 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 CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (纸本)9781665407380

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.

关键词： Adaptation models Voltage measurement power measurement power system dynamics Stability criteria power system stability power grids

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High-performance Full Electromagnetic Transient Simulation system of Fujian power Grid and its Application

High-performance Full Electromagnetic Transient Simulation S...

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

作者： Zhicheng Li Zhijun Tang Dongyuan Zhang Wujie Chao Xiaoyan Peng Yongjie Leng Fujian Key Laboratory of Smart Grid Protection and Operation Control Electric Power Research Institute State Grid Fujian Electric Power Co. Ltd Fujian China Fujian Key Laboratory of Smart Grid Protection and Operation Control Electric Power Research Institute State Grid Fujian Electric Power Co. Ltd Fuzhou China Integrated Electronic Systems Lab Co. Ltd. Jinan China

ISBN: (纸本)9781665434263

This paper proposes a high-performance full electromagnetic transient simulation system of Fujian power grid. The system is developed based on the General Transient Simulator (GTS), which is a self-developed electromagnetic transient simulation tool. The key technologies of the simulation system, such as the high-performance automatic parallel computing technology and the large time step electromagnetic transient simulation technology, are introduced. The full electromagnetic transient simulation of the AC power system above 10kV in Fujian power grid based on the dispatching control cloud platform is realized. Study cases are carried out and the validity and accuracy of the simulation are verified by comparing the actual fault recording data and simulation waveforms.

关键词： Cloud computing Computational modeling system integration power system stability Parallel processing power grids Dispatching

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An Application of Auxiliary operation of power Dispatching based on Semantic Analysis 12

An Application of Auxiliary Operation of Power Dispatching b...

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12th IEEE PES Asia-Pacific power and Energy Engineering Conference, APPEEC 2020

作者： Zhang, Tao Li, Hao Lu, Jixiang Jun, Lu Jin Li, Hong Xie, Feng Technology Research Center Nari Group Corporation Nanjing China State Key Lab. of Intelligent Power Grid Protection and Operation Control Nari Group Corporation Technology Research Center Nanjing China

ISBN: (数字)9781728157481

ISBN: (纸本)9781728157481

power dispatching plays quite an important role in power grid operation in terms of safety and stability. Structured data has been well managed in the real-time power dispatching and controlling system. However, the management of unstructured data such as text data has not received enough attention. In this paper, we accomplish an application of auxiliary operation of power dispatching by doing semantic analysis on operation procedures, which belong to an important category of power dispatching text data for fault disposal. The method that we proposed in our application is achieved based on Natural Language Processing (NLP) technologies. Our contributions are mainly two-fold: 1) we accurately extract key information from text data through our proposed method, and 2) we help power dispatching operators reduce their work and improve efficiency by providing auxiliary operation advice. © 2020 IEEE.

关键词： Semantics

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Current Saturation Analysis of Droop controlled Voltage Source Converter

Current Saturation Analysis of Droop Controlled Voltage Sour...

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International Conference on power system Technology (powerCON)

作者： Kehao Zhuang Hui Liu Xuekun Cheng Shiyao Qin Pengfei Hu Huanhai Xin College of Electrical Engineering Zhejiang University Hangzhou P. R. China Grid-Connected Operation Technology For Wind-Solar-Storage Hybrid System State Grid Corporation Key Laboratory State Grid Jibei Electric Power Research Institute Beijing China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems) China Electric Power Research Institute Beijing China

ISBN: (纸本)9781665407380

Droop controlled voltage source converters (VSCs) are very sensitive to overloading due to the low current capacity of switching devices, which implies that VSCs must switch from normal voltage control mode to current control mode at faults or load disturbance and therefore occur transient instability. This paper reviews current saturation phenomenon and reason of droop controlled VSCs. In particular, the boundary conditions between current saturation mode and normal mode are analyzed to express VSC’s static active power critical value at normal mode. Then, the influence of grid parameters and control parameters for current saturation is analyzed. Finally, the effectiveness of theoretical analysis is verified in MATlab/Simulink and hardware-in-the-loop experiments based on RTlab. The normal unsaturated VSC’s static active power critical value of theoretical calculation is basically consistent with the simulation.

关键词： Current control Switches power system stability Boundary conditions control systems power conversion Voltage control

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Effect of O2on Partial Discharge Characteristic of C5F10O/CO2Gas Mixture

Effect of O2on Partial Discharge Characteristic of C5F10O/CO...

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2021 International Conference on Advanced Electrical Equipment and Reliable operation, AEERO 2021

作者： Xia, Yalong Liu, Fan Wei, Zhuo Zhang, Xiaoxing Han, Pu Xiao, Song Li, Zhen Li, Yi Li, Yalong Research Institute State Grid Sichuan Electric Power Cheng Du China Wuhan University School of Electrical Engineering and Automation Wuhan China Hubei University of Technology Hubei Key Lab. for High-efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Wuhan China

ISBN: (纸本)9781665402644

C5F10O, as a new eco-friendly gas insulating medium with great application potential, has attracted much attention from researchers. There are few studies on the partial discharge (PD) characteristics of C5F10O/CO2O2 gas mixture at present. In this paper, we used needle-plate electrodes to simulate the extremely inhomogeneous electric field caused by the defects of metal protrusions in electrical equipment and tested the partial discharge initial voltage (PDIV) of C5F10O/CO2O2 gas mixture. The effect of oxygen on the partial discharge characteristics of C5F10O gas mixture was revealed. We found that C5F10O gas mixture has an obvious polarity effect, and PDIV+ is always larger than PDIV-. The addition of oxygen reduces the PDIV- and PDIV+ of C5F10O gas mixture and the reduction effect on PDIV+ is more obvious. Therefore, the degrading effect of O2 on the partial discharge characteristics of C5F10O gas mixture should be considered and the proportion of oxygen in C5F10O gas mixture should be strictly controlled. © 2021 IEEE.

关键词： Partial discharges

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Stability Optimization and Verification Based on SPTG of Constant Distance control Strategy in Train-Train Communication Train control system

Stability Optimization and Verification Based on SPTG of Con...

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第33届中国控制与决策会议

作者： Wanli Lu Jidong Lv Haixia Dong Hongjie Liu Ming Chai Shuai Su Xiwang Guo National Engineering Research Center of Rail Transportation Operation and Control System Beijing Jiaotong University State Key Lab of Rail Traffic Control Safety Beijing Jiaotong Universal Computer and Communication Engineering College Liaoning Shihua University

Next Generation Train control system(NGTC) based on train-train communication can efficiently realize train tracking control through constant distance *** to ensure the stability of the platoon with the control strategy is very crucial since the leader train action is random in the platoon *** on Stochastic Priced Timed Game(SPTG),we propose a train-train communication control strategy modeling and verification ***,according to the control strategy's requirements,a platoon control model including a leader train and follower trains are established and the stability are verified by SPTG ***,using time expansion as the cost function,the optimal operation strategy of the platoon is obtained through combination of the cooperative game of the platoon's SPTG automata model and ***,the stability optimization objection of the platoon is simulated in single-train operation,two-train operation and multi-train operation tracking *** with the random operation of the platoon,the result shows that this method can make the platoon stability error smaller.

关键词： Train-Train communication Train control system SPTG Stability Modeling and Verification

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