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检索条件"任意字段=8th IEEE International Conference on Advanced Power System Automation and Protection, APAP 2019"

共 611 条记录，以下是71-80 订阅

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Distributed Dynamic Reactive power Support system Based on DFIGs 8

Distributed Dynamic Reactive Power Support System Based on D...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Huang, Hongyang Nie, Jianbo Li, Zhenfeng Wang, Ke State Grid Zhejiang Electric Power Company Electric Power Research Institute Grid Technology Center Hangzhou China State Grid Zhejiang Integrated Energy Service Company Engineering Department Hangzhou China Zhejiang Huayun Electric Power Engineering Design Consultation Co. Ltd Design Department Hangzhou China

ISBN: (纸本)9781728117225

the reactive power control of the doubly fed induction generator (DFIG) plays an important role in improving power system voltage stability. Firstly, the reactive power capability of the commercial DFIG and its limitations are analyzed. It is pointed out that the DFIG has a strong reactive power output and absorption capability. On this basis, the distributed dynamic reactive power support system based on the DFIGs is proposed. the dynamic reactive power capability of the DFIGs can be fully explored by the proposed system. As a result, the dynamic reactive power reserve is increased and the power system voltage stability is improved. Finally, the simulation results of Zhejiang power Grid validate the effectiveness of the proposed technique. © 2019 ieee.

关键词： Reactive power

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Traveling Wave Bus protection for MMC Based Multi-terminal DC Distribution Network 8

Traveling Wave Bus Protection for MMC Based Multi-terminal D...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Yu, Linhui Zou, Ginbin Wei, Xiuyan Sun, Chenjun Shandong University School of Electrical Engineering Jinan China State Grid Hebei Electric Power Co. Ltd Shijiazhuang China

ISBN: (纸本)9781728117225

For Flexible Medium-voltage DC distribution network, this paper proposes a traveling wave bus protection and a fault pole selection method. the method is to extract the polarity relationship of current traveling waves in each branch of the bus by wavelet transform, it distinguishes the internal and external faults and chooses the fault pole by comparing the polarity of positive and negative poles' modulus maxima. Entensive simulations are based on three-terminal DC distribution network model established in PSCAD/EMTDC. the simulation results show that the proposed method not only can identify internal and external faults of DC bus reliably and rapidly, but is also effective in detecting fault poles. © 2019 ieee.

关键词： Wavelet transforms

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A Combined Operation Mode of Wind power, Gas-fired power and Pumped Storage 8

A Combined Operation Mode of Wind Power, Gas-fired Power and...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Zhou, Haoran Bie, Zhaohong Wang, Ke Xu, Keqiang Xi'an Jiaotong University Smart Grid Key Laboratory of Shannxi Province Xi'an China China Southern Power Grid Csg Power Dispatching and Communication Centre Guangzhou China

ISBN: (纸本)9781728117225

In order to improve the utilization of renewable energy and reduce the damage caused by the volatility of renewable energy, it is necessary to further study the multi-energy combined operation strategy. In this paper, a combined operation mode of wind power, gas-fired power and pumped storage is put forward. In this mode, wind power is the main source while gas-fired power and pumped storage act as an adjustment to smooth wind power output. the model takes the maximum benefit of joint operation as the objective and adopts mixed integer linear programming. through an example, the economic benefit of the combined operation mode of wind-gas-pumped storage is calculated. the results show that this operation mode not only improves the utilization of wind power, but also improves the efficiency of power grid operation. © 2019 ieee.

关键词： Wind power

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Crosstalk Analysis between power Lines and Signal Lines Based on the Finite Difference-Time Domain Method 8

Crosstalk Analysis between Power Lines and Signal Lines Base...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Li, Aidi Liu, Qing Yang, Jiayi Zhou, Ningxin Xi'an University of Science and Technology College of Electrical and Control Engineering Xi'an China

ISBN: (纸本)9781728117225

the crosstalk of the power line to the safety monitoring signal line in the rectangular tunnel leads to the unstable state of the safety monitoring signal, especially producing the misreport or omission which seriously affects the safety of the power equipment and personnel. In this paper, the crosstalk shielded cable model is established for the signal line affected by the electromagnetic interference of the power line, based on the actual electrical parameters of cables. the purpose of this paper is to solve the transfer impedance of the shielded cable and calculate the characteristics of crosstalk by the Finite Difference-Time Domain method (FDTD). Finally, the variation rules of terminal matching load, terminal direct grounding and crosstalk under different layouts are studied. the results have certain reference value for perfecting the theory of monitoring and communication in rectangular tunnel and exerting the safety guarantee function of power safety monitoring equipment. © 2019 ieee.

关键词： Crosstalk

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Analysis of Application of Superconducting Fault Current Limiter to AC Line of HVDC 8

Analysis of Application of Superconducting Fault Current Lim...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Chen, Binshu Dong, Xinzhou Tsinghua University Key Lab of Control and Simulation of Power Systems and Generation Equipment Dept. of Electrical Engineering China

ISBN: (纸本)9781728117225

In LCC-HVDC hybrid grid, commutation failure is an important factor affecting system stability. When there is a fault or a large voltage fluctuation in AC line of LCC-HVDC, a commutation failure will occur. Fault current limiter (FCL) can limit the fault current and prevent commutation failure. Superconducting current limiters using superconducting materials as the core component, have no power loss and do not affect the dynamic performance of the system during normal operation. this article analyze how SFCL acts to suppress commutation failure in AC/DC hybrid systems, and describes the various types of SCFCLs and their limitations for this scene. By building simulation models of SCFCLs applied to AC line of LCC-HVDC invert, the author analyzes the effect of SCFCL on the hybrid grid. © 2019 ieee.

关键词： Superconducting fault current limiters

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On-line Detection of Transmission Line Deterioration Using power Line Communication Signal in Low-voltage Distribution Networks 8

On-line Detection of Transmission Line Deterioration Using P...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Lai, Zihan Zheng, Tao Xi'an Jiao Tong University School of Electrical Engineering Xi'an China

ISBN: (纸本)9781728117225

In this paper, we propose an on-line detection method for transmission line deterioration by using power line communication (PLC) signals in the distribution network of low-voltage power system. In order to prove the feasibility of this method, firstly, we analyze the process of PLC and the conditions to be satisfied in theory. Secondly, we analyze two kinds of common transmission line deterioration: weak cable insulation and bad line switch contact. We give the models of these two cases and analyze the characteristics of PLC signals when these two kinds of deterioration occur. thirdly, we use fast Fourier transformation (FFT) algorithm to analyze the extracted signal in frequency domain and get frequency domain properties. Finally, we use these properties to identify types of deterioration. Simulation results verify the reliability of this method. © 2019 ieee.

关键词： Frequency domain analysis

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Study on Vibration Characteristics of Transformer Insulation Ageing 8

Study on Vibration Characteristics of Transformer Insulation...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Fu, Chenzhao Si, Wenrong Xu, Peng He, Lin Tian, Haoyang Xu, Xiangyi Wang, Shaojing Cui, Lv Shi, Yuhang Ji, Shengchang State Grid Shanghai Electric Power Research Institute China Xi'an Jiaotong University State Key Laboratory of Electrical Insulation and Power Equipment Xi'an China

ISBN: (纸本)9781728117225

the fault caused by transformer insulation aging accounts for a large proportion of the total fault of the transformer. therefore, it is extremely important to accurately evaluate the aging state of the transformer insulation. In this paper, the vibration characteristics of windings under different load currents and different pressing forces are studied. A transformer aging test platform was built in the laboratory. the vibration characteristics of the transformer tank surface under different aging times were studied by accelerated aging test. the results lay the foundation for transformer insulation aging evaluation technology based on vibration signal. © 2019 ieee.

关键词： power transformers

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A Fast protection Scheme Using Fault Current Characteristics in Multi-terminal Flexible DC Distribution Network 8

A Fast Protection Scheme Using Fault Current Characteristics...

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8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Liu, Le Kang, Xiaoning Zheng, Mengyuan Li, Ke Xi'an Jiaotong University Shanxi Key Laboratory of Smart Grid Xi'an China

ISBN: (纸本)9781728117225

the fast and reliable detecting of DC faults and fault type identification is one of the key technologies for multi-terminal flexible DC distribution networks. In this paper, a DC reactor is used as the boundary component of the DC distribution network, based on the characteristics of fault current, a new protection scheme is proposed for multi-terminal flexible DC distribution network. this scheme uses the sudden change and the changing rate of fault current as the criterion to realize identification of the fault occurrence zone, and through the direction of the fault current to judge the fault type. the scheme can not only realize the rapid identification of DC line faults, but also can avoid the influence of line transition resistance and system operation mode Finally, a three-terminal flexible DC distribution network model is built in the PSCAD/EMTDC platform to verify the feasibility of the scheme under different DC faults. © 2019 ieee.

关键词： Fault detection

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Characteristics of Short-term Voltage Dynamics Based on Mixed Monotone Decomposition 8

Characteristics of Short-term Voltage Dynamics Based on Mixe...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Chen, Minquan Liu, Junlei Kang, Zhuoran Liu, Sijie Li, Shangyuan Gan, Deqiang Bai, Yunxiao Peng, Xiaoqiang Zhejiang University School of Electrical Engineering Hangzhou China China Southern Power Grid Guangdong Dispatch and Operation Center Guangzhou China

ISBN: (纸本)9781728117225

this paper presents some preliminary results to reveal inherent characteristics of short-term voltage dynamics based on a relatively new conception called mixed monotone decomposition. An approximate linear dynamic system is established firstly by using Dommel-Sato iterative method and linearization techniques to differential algebraic equations. then mixed monotone systems and mixed monotone decomposition conceptions are introduced. Furthermore, we use a three-machine test system to demonstrate the concept of mixed monotone, which are helpful to promote further qualitative analysis and improve control performance. © 2019 ieee.

关键词： Iterative methods

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Study on SSCI of DFIG-Based Wind Farms by Equivalent Circuit Modeling 8

Study on SSCI of DFIG-Based Wind Farms by Equivalent Circuit...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Zhang, Tao Hao, Zhiguo Yuan, Saijun Shu, Jin School of Electrical Engineering Xi'an JiaoTong University Xi'an China Xi'an Thermal Power Research Institute Co. Ltd. Xi'an China

ISBN: (纸本)9781728117225

Subsynchronous control interaction (SSCI) in DFIG-based wind farms has attracted intensive attention from the academia. In order to further study the mechanism of SSCI, this paper carries out equivalent circuit modeling. Firstly, based on the numerical equivalent circuit of PI control unit, the equivalent model of RSC is built. Furthermore, the RSC model is simplified by PI parameter sensitivity analysis, and the impedance-frequency curve of the target system is obtained by frequency scanning. then, the mechanism and influencing factors of SSCI are studied based on the equivalent circuit model, which are verified by simulation analysis finally. © 2019 ieee.

关键词： Equivalent circuits

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