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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111-120 订阅

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Fault Ride through Capability Enhancement of Doubly Fed Wind Generator Using Hybrid protection Circuits 8

Fault Ride through Capability Enhancement of Doubly Fed Wind...

引用

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

作者： Tipo, Bunan Li, Jing Qin, Boyu Xi'an Jiaotong University School of Electrical Engineering Xi'an710049 China Jiangsu Nuclear Power Co. Ltd Lianyungang222000 China

ISBN: (纸本)9781728117225

this paper presents a new FRT control strategy to improve the dynamic response of doubly fed induction generator based wind turbine (DFIG-WT) during grid fault. the proposed control scheme is based on hybrid protection circuits, which comprises an active crowbar circuit, a series dynamic resistance (SDR) circuit, and a DC-link Chopper circuit. A coordinated control strategy is been developed to enable the circuit. this strategy enables the crowbar to disable the rotor side converter (RSC), allowing the rotor overcurrent to path through SDR resistors, and the DC-Chopper is engaged to suppress the overvoltage in DC-Link. Simulation analysis by using MATLAB/Simulink shows that the proposed strategy enhanced FRT capabilities for DFIG in symmetrical voltage dip, protected the power converter, limited the rotor overcurrent, and suppressed the DC-link overvoltage. © 2019 ieee.

关键词： Choppers (circuits)

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Design of Control system for BLDCM without Position Sensor 8

Design of Control System for BLDCM without Position Sensor

引用

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

作者： Yue, Wang Jun, Xu Bo, Dong Jiang Dan, Fang University of Science and Technology School of Electrical and Control Engineering Xi'an Xi'an China

ISBN: (纸本)9781728117225

the rotor position detection of brushless DC motor(BLDCM) without position sensor is studied. According to the mechanical structure and control characteristics of brushless DC motor ,the method of detecting the back electromotive force by zero-crossing is used to model and simulate the position sensorless control system of the brushless DC motor by citing a method of detecting the position of the rotor to obtain the position of the rotor. A mathematical model of the three-phase brushless DC motor was established, and the simulation model of the control system was established in MATLAB/Simulink. the motor armature current, back electromotive force, motor speed, etc. are analyzed at a given speed and variable load. the feasibility of the above control method is verified by experiments, and the normal operation of the brushless DC motor without position sensor in the full speed range is realized. © 2019 ieee.

关键词： Brushless DC motors

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A Fault Location Algorithm for HVDC Grounding Electrode Line with Distribution parameter model 8

A Fault Location Algorithm for HVDC Grounding Electrode Line...

引用

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

作者： Zhang, Yining Wang, Yueyang Cheng, Xingxing Csg Ehv Power Transmission Company Maintenance Test Center Guang Zhou China State Grid Corporation of China Jiaxing Power Supply Company Jiaxing China

ISBN: (纸本)9781728117225

When taking earth as part of HVDC system loop, Grounding electrode system is connected to ground effectively, operation mode of which is different from normal HVDC lines. A ±500kV HVDC system model is established in this paper by using PSCAD/EMTDC simulation platform, based on which the fault operation characteristic of grounding electrode line is simulated and analyzed , and a fault location method based on the Bergeron line model aimed at single line grounded short circuit is also put forward in this paper. Head-end voltage and two outlets current after fault are used to calculate voltage distribution along line. According to the characteristics that the fault or electrode point is the minimum voltage along line, the fault location function is established to calculate the fault distance. the simulation result and project instances indicated that the fault of grounding electrode line can be located accurately with the proposed method. © 2019 ieee.

关键词： HVDC power transmission

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A Single-Ended Fault Location Method for DC Line Based on Active Signal 8

A Single-Ended Fault Location Method for DC Line Based on Ac...

引用

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

作者： Guo, Bing Song, Guobing Hou, Junjie Wu, Lei Han, Wei Xi'an Jiaotong University School of Electrical Engineering Xi'an710049 China State Grid Henan Electric Power Research Institute Zhengzhou450000 China

ISBN: (纸本)9781728117225

this paper presents a single-ended fault location method for MMC-HVDC line. the method generates an active signal through converter control during fault ride through process. the fault location algorithm is based on parameter identification and distributed parameter line model. Simulation results has proved the high reliability and accuracy of the proposed method. the location can be calculated repeatedly and the accuracy of the location result is independent of higher sampling frequency. the impact of transition resistance can be eliminated with DC current control. © 2019 ieee.

关键词： Time domain analysis

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Study on Safety Management system of power Grid Enterprises 8

Study on Safety Management System of Power Grid Enterprises

引用

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

作者： Zhang, Yan Tian, Xin Jin, Xiaoling Xiang, Rui Zhang, Yiwei Grid Research Institute State Grid Energy Research Institute Co. Ltd. Beijing China Tsinghua University Department of Electrical Engineering Beijing China

ISBN: (纸本)9781728117225

Safety management is essential for production and business enterprise to guarantee the safety of both personnel and property. Safety management practices of power grid enterprises in China have a history of several decades with continuous development and improvement. However, there are still many shortcomings, especially in distribution networks. Distribution network companies in European countries have more mature measures in distribution network safety management, and in particular many of which are applicable to the market-oriented business environments. this paper studies the structure of safety management system for power grid enterprises in China and Europe. Two kinds of management systems are discussed and compared to propose suggestions for future development of power grid safety management in China. © 2019 ieee.

关键词： Human resource management

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Optimization of Fault Current Limiter Configuration Based on Improved Niche Genetic Algorithm 8

Optimization of Fault Current Limiter Configuration Based on...

引用

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

作者： Li, Danyang Hao, Zhiguo Zhang, Zhihua Wang, Yizhao School of Electrical Engineering Xi'an JiaoTong University Xi'an China Electric Power Research Institute State Grid Shaanxi Electric Power Company Xi'an China

ISBN: (纸本)9781728117225

In allusion to the optimal allocation of fault current limiter (FCL) in whole power grids, a multi-objective optimization configuration method based on improved niche genetic algorithm with preselection mechanism is proposed. Nodes with short-circuit currents exceeding standard and branches where FCL could be triggered reliably are determined through system short-circuit current calculation. By analyzing the influence of FCL installation on system impedance matrix, the sensitivity method based on the branch impedance change rate is used to narrow the search space. then using the improved niche genetic algorithm with preselection mechanism to optimize the calculation to realize the optimal configuration of the number, the impedance value and the location of fault current limiters. Finally, simulation results of the New England 39-node system verify the effectiveness of the proposed method. © 2019 ieee.

关键词： Fault current limiters

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An Improved Control Method for Voltage Source Converter-High Voltage Direct Current system 8

An Improved Control Method for Voltage Source Converter-High...

引用

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

作者： Sun, Yimeng Liu, Yingpei North China Electric Power University School of Electrical and Electronic Engineering Beijing China

ISBN: (纸本)9781728117225

this paper aims to enhance the accuracy and response speed of the active-disturbance rejection control (ADRC) controller of the voltage source converter-high voltage direct current (VSC-HVDC) system. For this purpose, an improved control method was proposed for the VSC-HVDC system based on the least squares support vector machine (LSSVM) optimization of the ADRC controller. First, the ADRC regulators were designed for the active/reactive power outer loop in VSC-HVDC inverter control system. then, the LSSVM optimized regression model was created for the ADRC regulators. Finally, the proposed method was successfully simulated on MATLAB. the simulation results show that the LSSVM-optimized ADRC method can effectively enhance the anti-interference ability of the VSC-HVDC. the research findings shed new light on the signal analysis of the VSC-HVDC system. © 2019 ieee.

关键词： Controllers

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Transient Waveform Characteristics Based Current Differential protection of Wind Farm Outgoing Line 8

Transient Waveform Characteristics Based Current Differentia...

引用

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

作者： Lv, Zhe Wang, Zengping Xu, Wanyu North China Electric Power University State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Beijing China

ISBN: (纸本)9781728117225

With the increase of wind farms integrated into the power system, the fault characteristics affected by the wind turbines bring challenges to traditional power frequency based protection for wind farm outgoing lines. Considering the fault transient components contain lots of fault information, a novel transient differential current waveform characteristics based protection is proposed. the protection uses the transient full-time differential current within 5ms after fault, which can reduce the influence of different wind turbine controls and improve the operation speed of protection. In the proposed protection, the least square curve fitting method is used to extract the main frequency of the transient current waveform of each phase. then, the fault phase and non-fault phase are distinguished according to the protection criterion. the transient simulation results show that under different fault locations and types, the protection scheme can identify the fault phase of internal faults sensitively and reliably. With low requirement for sampling frequency, the protection performance is robust to high fault resistances and noise disturbance. © 2019 ieee.

关键词： Transients

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Research on Distributed Energy Application Mechanism and Key Technologies Based on Hyperledger 8

Research on Distributed Energy Application Mechanism and Key...

引用

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

作者： Song, Jianjing Li, Yun Song, Wenjie Chen, Hui Li, NingFeng State Grid Electric Power Research Institute Nari Group Corporation China

ISBN: (纸本)9781728117225

Along with the energy revolution and the environmental movement, the energy industry is transforming into a clean, distributed energy sector with a new energy structure featuring multiple energy flows complementing each other. Blockchain is a distributed database that is jointly maintained by the consensus of the whole network and maintains all historical transaction data. It provides a feasible path for the transaction demand of distributed energy, high frequency and low cost. Firstly the problems brought by distributed energy transaction and the business positioning of each subject is analyzed. Based on the core demand of distributed energy transaction, the fit between Blockchain technology and distributed energy transaction is analyzed. On this basis, Fabric distributed energy transaction architecture and transaction flow are proposed, and the key technologies of distributed data storage, consensus mechanism and intelligent contract are analyzed. © 2019 ieee.

关键词： Smart contract

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Identification of Vulnerable Links in power Grid Based on Brittleness theory of Complex system under Geomagnetic Storm Conditions 8

Identification of Vulnerable Links in Power Grid Based on Br...

引用

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

作者： Kang, Xiaoning Zhang, Yagang Zhang, Xinyue Xu, Yini Li, Xiaoyu Zhou, Hao Shaanxi Key Laboratory of Smart Grid Xi'an Jiaotong University Xi'an China

ISBN: (纸本)9781728117225

Geomagnetic disturbances will induce GIC (Geomagnetically Induced Currents) in high voltage power grid. GIC can cause cascading failure in power system, resulting in power system collapse or blackouts. In this paper, the mechanism of cascading failure in power system under geomagnetic storm is analyzed, and a vulnerable link identification process based on brittleness theory of complex system under geomagnetic storms is proposed. the brittleness theory of complex system is used to identify the vulnerable link and cascading failure propagating process of power grid under the condition of geomagnetic storm. Finally, the proposed process is validated by using the ieee-RTS79 system. the verification results show the validity and practicability of the proposed process. the obtained results can provide reference for quantifying and preventing the risk of power grid under geomagnetic storms. © 2019 ieee.

关键词： Brittleness

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