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检索条件"任意字段=2023 IEEE International Conference on Advanced Power System Automation and Protection, APAP 2023"

共 2132 条记录，以下是41-50 订阅

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Analytical Assessment of Reactive power Support Capacity for DFIGs under Voltage Drop Failure

Analytical Assessment of Reactive Power Support Capacity for...

引用

2023 ieee international conference on advanced power system automation and protection, apap 2023

作者： Lin, Jintian Hua, Wen Zhang, Jiancheng State Grid Zhejiang Electric Power Co. LTD Research Institute Hangzhou China

ISBN: (纸本)9798350306668

Since the reactive power support capacity of the doubly-fed induction generator (DFIG) during grid failures can be scheduled within a certain range, DFIGs are used as an effective and controllable reactive power source to support the AC grid voltage. However, the nonlinearity of the power flow equations in wind farms and the uncertainty of the reactive power range of DFIGs limit the accurate assessment of the reactive power support capacity of DFIG-based wind farms. To this end, this paper proposes a reactive power support capability evaluation method considering the internal and external constraints of DFIG operations. By focusing on the impacts of the rotor current and the coupling between the terminal voltage and reactive power on the allowable reactive power support capacity of DFIGs, analytical constraints of allowable reactive power of DFIGs under voltage drop are analyzed. At last, with the time domain simulation analysis, the allowable reactive power range of DFIGs considering internal and external constraints is verified. © 2023 ieee.

关键词： Reactive power

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A Novel Principle of Current Differential protection for Renewable Energy Station

A Novel Principle of Current Differential Protection for Ren...

引用

2023 ieee international conference on advanced power system automation and protection, apap 2023

作者： Lan, Chen Huang, Song Zhang, Jindao Meng, Jing Zhang, Huaiyu Zheng, Xiaodong Shanghai Jiao Tong University Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai China Shanghai Chongming Electric Power Corporation of State Grid Dispatch and Control Center Shanghai China

ISBN: (纸本)9798350306668

In the context of building a new power system dominated by renewable energy sources, the integration of high proportion of renewable energy and high proportion of power electronic equipment imposes stricter requirements on power system protection. The current differential protection, as the main protection for the outgoing line of renewable energy stations, has a significant impact on the development and utilization of renewable energy and the stable operation of the power grid. Most of the existing studies start from the specific fault characteristics of renewable energy sources, and improve the performance of differential protection by modifying and supplementing criteria. This paper analyzes the phase and amplitude relationships of each phase current on both sides of the outgoing line of the renewable energy station, proposes a novel principle of current differential protection based on cross compensation, and verify the performance of proposed protection by building a model in PSCAD/EMTDC. © 2023 ieee.

关键词： Renewable energy resources

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Construction and Applications of Knowledge Graph of Relay protection Device Defects Based on Ne04J and Structured Data

Construction and Applications of Knowledge Graph of Relay Pr...

引用

2023 ieee international conference on advanced power system automation and protection, apap 2023

作者： Zheng, Shaoming Dong, Peng Du, Juan Liu, Dan Su, Hongzhi Wang, Shuhong Tao, Chang Yang, Jinzhou Xue, Ancheng China Power Dispatching and Control Centre China Beijing China North China Electric Power University State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Beijing China

ISBN: (纸本)9798350306668

The defect data of relay protection device contains rich operation and maintenance management information that needs to be excavated, and its effective utilization is of great significance for improving the reliability of relay protection system operation. This paper constructs a knowledge graph based on Neo4j for the structured data of relay protection device defect records, and implements the related applications, and completes the information mining work. Specifically, firstly, the powerful data retrieval and screening function based on Neo4j knowledge graph is explained from the basic theory;secondly, the structured data is divided into corresponding nodes and attribute relations according to the construction logic graph, and the Neo4j-based knowledge graph is formed;finally, the nodes and attributes matching method is adopted to traverse and retrieve the structured data knowledge graph, and the online query of defect type and statistical analysis of equipment performance of each manufacturer are realized. © 2023 ieee.

关键词： Defects

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A Grounding Fault protection Method for Low Resistance Grounded Distribution Networks Based on Capacity Current

A Grounding Fault Protection Method for Low Resistance Groun...

引用

2023 ieee international conference on advanced power system automation and protection, apap 2023

作者： Wang, Gang Gao, Houlei Peng, Fang Yuan, Tong Li, Lin School of Electrical Engineering Shandong University Jinan China

ISBN: (纸本)9798350306668

When a single-phase grounding fault occurs in a low resistance grounded distribution network, the threshold for zero-sequence overcurrent protection is often set based on the principle of avoiding the maximum capacity current of the non-fault line. Due to the high threshold value, the protection will refuse to operate under high resistance grounding conditions. This paper proposes a grounding fault protection method for low resistance grounded distribution networks based on capacity current compensation on the basis of the existing zero-sequence overcurrent protection. This method serves as a backup protection for the existing overcurrent protection. When the low resistance grounding fault occurs, the existing protection operates. When the high resistance grounding fault occurs, the existing protection refuses to operate. The zero-sequence current of each outgoing line is compensated using the bus voltage and line capacity parameters, and the ratio after and before compensation is calculated. By comparing this ratio with the protection threshold in this paper, reliable operation of the protection in case of high resistance grounding faults can be achieved. After theoretical derivation and model simulation, this method can cope with stable grounding faults and the ability to handle fault resistance can reach about 4000. © 2023 ieee.

关键词： Overcurrent protection

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Electromagnetic Transient Simulation Modelling and Analysis of Electric Vehicle Charging Stations

Electromagnetic Transient Simulation Modelling and Analysis ...

引用

2023 ieee international conference on advanced power system automation and protection, apap 2023

作者： Yang, Jiawei Chen, Hongfei Meng, Xiaoqiang Ge, Tianqi Guan, Xin Luo, Yongjie Hangzhou Yuhang District Power Supply Company State Grid Zhejiang Electric Power Co. Ltd. Hangzhou China Hangzhou Electric Power Design Institute Co. Ltd Hangzhou China School of Electrical Engineering Chongqing University Chongqing China

ISBN: (纸本)9798350306668

High-power chargers using modern power electronics are highly non-linear power consumption devices that generate harmonic pollution to the power grid. In contrast, a high-current power supply takes less time and is favourable to the promotion of electric vehicles, but the harmonic currents generated during charging will degrade the power quality of the power system. In this paper, a simplified model of the charger is proposed, in which a nonlinear resistor Rc is used to approximately simulate the equivalent input resistance of the high-frequency power conversion link, and the correspondence between the charging power and the equivalent resistance is given. Based on the data of a demonstration charging station, a single-machine grid-connected model as well as a multi-machine grid-connected model are constructed on the ADPSS platform, and harmonic analyses of the charging station are carried out, focusing on the study of the harmonic current containment rate of each harmonic, and the law of the total harmonic distortion rate of the current with the change of charging power of the electric vehicle. © 2023 ieee.

关键词： power quality

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Differential protection Sensitivity Enhancement Scheme for AC Transmission Lines Connecting to VSC-HVDC Station

Differential Protection Sensitivity Enhancement Scheme for A...

引用

2023 ieee international conference on advanced power system automation and protection, apap 2023

作者： Zhang, Huaiyu Liu, Zhongping Liu, Hulin Hou, Yong Lan, Chen Zheng, Xiaodong Shanghai Jiao Tong University Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai China East China Branch of State Grid Corporation of China Dispatch and Control Center Shanghai China

ISBN: (纸本)9798350306668

With the vigorous development of renewable energy and the popularization of HVDC transmission, the structure of power sources has changed a lot. The output current amplitude of power electronic devices is limited, the phase angle of current is controlled, and the characteristics of the sequential component are affected by the converter control strategy, which are different from fault characteristics of SGs. When the AC power system is connected to a large-capacity cross-area VSC-HVDC station, the sensitivity of the conventional current differential protection is reduced during fault on AC transmission line connecting to VSC-HVDC station. To solve the problem of insufficient sensitivity of conventional differential protection on AC transmission line connecting to VSC-HVDC station, this paper analyzed the fault characteristics of AC transmission line connecting to VSC-HVDC station during fault and proposed a current differential protection sensitivity enhancement scheme applicable to AC transmission line connecting to VSC-HVDC station. The scheme can improve the protection performance of the AC transmission line connecting to VSC-HVDC station, supporting the construction of a new type power system. © 2023 ieee.

关键词： Renewable energy resources

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Performance Improvement for Pilot protection of Double Circuit Lines on the Same Tower Based on power Converse Accurate Identification

Performance Improvement for Pilot Protection of Double Circu...

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2023 ieee international conference on advanced power system automation and protection, apap 2023

作者： Huang, Kai Jiao, Bo Yu, Yang Liu, Hongliang Hao, Quan Liu, Yiqing State Grid Zibo Power Supply Company Zibo China University of Jinan School of Electrical Engineering Jinan China

ISBN: (纸本)9798350306668

The power converse phenomenon, which frequently occurs on double circuit lines on the same tower, can cause the pilot protection of non-fault lines misoperation. Firstly the reasons for the occurrence of power converse and its influence on pilot protection are clarified. Then this paper presents a performance improvement scheme for pilot protection of double circuit lines on the same tower based on the fully using the substation-area information. The scheme consists of two parts, which are accurate identification method for power converse and determining method of blocking delay during power converse period. It identifies the power converse according to the different trips of circuit breakers on the faulted line and adjusts the blocking time of non-fault line in real time. A typical model of double circuit lines was established in PSCAD to verify the correctness of the proposed scheme and carried out a detailed comparison with existing methods. The simulation results show that the proposed scheme can accurately identify the occurrence of power reversal and strictly match the blocking time of the pilot protection with the time period of power converse. Therefore, the protection performance has been effectively improved. © 2023 ieee.

关键词： Towers

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A Thyristor-Controlled Superconducting Current Limiting Module on Mitigation of Commutation Failure in LCC-Based HVDC systems

A Thyristor-Controlled Superconducting Current Limiting Modu...

引用

2023 ieee international conference on advanced power system automation and protection, apap 2023

作者： Wang, Haonan Huyang, Minghao Dong, Qihuan Chao, Wujie Shi, Shenxing Dong, Xinzhou Tsinghua University State Key Lab. of Power System and Generation Equipment Beijing China State Grid Fujian Electric Power Research Institute Fuzhou China

ISBN: (纸本)9798350306668

With more applications and larger transmission capacity of LCC-HVDC transmission systems, commutation failure has attracted more attention. In view of this problem, existing methods pay less attention to commutation failures caused by severe short-circuit faults on AC or DC side. In this paper a thyristor-controlled superconducting current limiting module is proposed based on resistive superconducting current limiting units. The operating principles are presented followed by detailed analysis for commutation under AC short-circuit faults and DC short-circuit faults. The performance of the proposed method is validated by simulation results in MATLAB/Simulink. The simulation results show that the proposed method can effectively prevent the first commutation failure caused by severe short circuit fault. © 2023 ieee.

关键词： Thyristors

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State Evaluation of Secondary Equipment Based on Matter-Element Extension Theory

State Evaluation of Secondary Equipment Based on Matter-Elem...

引用

2023 ieee international conference on advanced power system automation and protection, apap 2023

作者： Suo, Jianglei Wang, Feng Zhu, Jia Tan, Qian Chen, Kai Liu, Ge Power Dispatching Control Center of Guangdong Power Grid Co. Ltd Guangzhou China Guodian Nanjing Automation Co. Ltd Nanjing China

ISBN: (纸本)9798350306668

Aiming at the problems of single evaluation index, strong subjectivity and lack of accuracy of evaluation results in the traditional evaluation model of secondary equipment in power system, a comprehensive evaluation method of secondary equipment operation status based on matter-element extension theory is proposed. First, build a comprehensive evaluation index system for the operation status of secondary equipment. Secondly, the subjective and objective weights of the evaluation indicators are calculated based on the attribute hierarchy model and the anti-entropy weight method. On this basis, the combined weights are calculated using the cooperative game model. Finally, based on matter-element extension theory, a comprehensive evaluation model of secondary equipment operation status is built. The case analysis shows that this method can improve the rationality and accuracy of the secondary equipment condition evaluation results, and provide effective assistance for the operation, maintenance and repair of secondary equipment. © 2023 ieee.

关键词： Entropy

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Investigation of Fracture Mechanism and Performance Optimization of Grading Electrode Applied in HVDC system

Investigation of Fracture Mechanism and Performance Optimiza...

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2023 ieee international conference on advanced power system automation and protection, apap 2023

作者： Wang, Zhen Xiang, Xuemei Zhang, Henglei Yang, Zhongyuan Zhang, Yueying Electric Power Research Institute China Southern Power Grid Guangzhou China China United Test & Certification Co. Ltd Material Failure Analysis Laboratory Beijing China

ISBN: (纸本)9798350306668

Grading electrode is widely used to the converter valve in the high voltage direct current (HVDC) system for balancing the voltage between the components and protecting components from electrolytic corrosion. The grading electrode is made of pure Pt in a needle shape. Recently, some Pt electrode needles fractured during service which should be paid more attention. Multiple fracture causes have been analyzed utilizing a combination methods of chemical composition analysis, mechanical property test, fracture surface observation and microstructure observation. It is demonstrated that the failure mechanism of the Pt needle is fatigue fracture. This mainly due to the low shear strength of the Pt needle, which is around 140MPa. In order to increase the safety and reliability of grading electrode during service, the processing technology of the Pt needles has been optimized. The microstructure of the Pt needle has been improved and the shear strength has been increased to 297MPa. © 2023 ieee.

关键词： Electrodes

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