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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51-60 订阅

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Coordinated Control Strategy of Offshore Wind Farm and MMC-HVDC to Improve the Inertia Level of power system 8

Coordinated Control Strategy of Offshore Wind Farm and MMC-H...

引用

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

作者： Ma, Zun Wang, Xiaoru Wu, Song Zhang, Xiufeng Southwest Jiaotong University School of Electrical Engineering Chengdu China

ISBN: (纸本)9781728117225

the offshore wind farm is connected to the onshore power grid via a modular multilevel converter based high voltage direct current (MMC-HVDC) transmission, which results in decreasing of total rotary inertia of the power system. the frequency stability of the power grid will faces bigger challenges. this paper proposes a coordinated control strategy utilizing both the capacitor energy of the MMC-HVDC submodule and the over-speed reserve capacity of the wind turbine (WT). the strategy can provide fast frequency support for the power grid within the range of DC voltage and the reserve capacity WT. It further improves system inertia and avoids secondary impact on the grid frequency in the process of rotor speed recovery. Finally, the effectiveness of the proposed coordinated control strategy is verified by time domain simulation. © 2019 ieee.

关键词： HVDC power transmission

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Automatic Switchover system Scheme for 20kV Petal-shape Distribution Network Non-communication protection 8

Automatic Switchover System Scheme for 20kV Petal-shape Dist...

引用

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

作者： Liangliang, Hua Siyu, Li State Grid Corporation of China State Grid Tongliao Power Supply Company Tongliao China Northeast Electric Power University School of Electrical Engineering Jilin China

ISBN: (纸本)9781728117225

Automatic bus transfer equipment is one of the most effective means to improve the power supply reliability of power *** present, few domestic 20kV petal shaped distribution network operation has considered the use of automatic switching function,So it will extend part of the load power outage time. this paper has improved a automatic switchover system scheme for 20kV petal type distribution network which without channel protection. through coordination of the settle time of the distribution line which between non-channel protection and automatic bus transfer, under the condition that there is no breakdown of the connecting generatrix of the tie ring network switch,except for the longest cutoff time tset,any single phase voltage is below the set voltage and automatic bus transfer can be fast *** verification by PSCAD/EMTDC,this scheme can effectively improve the reliability and self-healing of the system, and shorten the outage time of the users. © 2019 ieee.

关键词： Outages

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the Effect of DFIG on Electromechanical Oscillation with Combined Reactive power Damping Control and Virtual Inertial Control 8

The Effect of DFIG on Electromechanical Oscillation with Com...

引用

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

作者： Xu, Xiaoqian Liang, Danqi Wang, Zhen Li, Dandan Zhang, Aijun Xing, Huadong Zhejiang University College of Electrical Engineering Hangzhou China Inner Mongolia Power Research Institute Hohhot China

ISBN: (纸本)9781728117225

In this paper, an investigation on oscillation damping enhancement of DFIG with the combined reactive power damping control (RPDC) and virtual inertia control (VIC) is conducted. A brief principle introduction on RPDC and VIC is presented firstly. then the effect of VIC loop and RPDC loop on the electromechanical oscillation modes of power system is analyzed independently, it is revealed that the system damping will be enhanced by increasing the RPDC coefficient. the finding is tested using a modified four-machine and two-area system. Further eigenvalue analysis, time-domain simulation and Prony analysis of the case study can verify the theoretical results.1 © 2019 ieee.

关键词： Reactive power

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power Electronic Switching Models for Numerical Simulations of power system Electromagnetic Transient 8

Power Electronic Switching Models for Numerical Simulations ...

引用

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

作者： Guo, Ning Liu, Wenzhuo Shaanxi Key Laboratory of Smart Grid Xi'an Jiaotong University Xjtu Xi'an China China Electric Power Research Institute Power System Department Beijing China

ISBN: (纸本)9781728117225

Due to the increasing number of power electronic devices in modern power systems in the past two decades, the numerical simulation results of electromechanical transient processes based on quasi-steady state models have been questioned under critical operating mode. therefore, it is urgent to develop software for electromagnetic transient simulation of real power systems. One of the most difficult problems in this study is how to set up a suitable power electronic switching model. this paper reviews relative research literatures on mathematical models of power electronic switches without considering their own transient processes, introduces the establishment methods of various models and their applications in widely used commercial software, and evaluates their advantages and disadvantages. © 2019 ieee.

关键词： Numerical models

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A Conventional Distance protection for Series-Compensated Lines Considering TCSC Protected by a Metal Oxide Varistor 8

A Conventional Distance Protection for Series-Compensated Li...

引用

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

作者： Seo, Woo-Seok Kang, Sang-Hee Yoon, Young-Doo Yoon, Jong-Su Myongji University Korea Republic of Hanyang University Korea Republic of Korea Electric Power Research Institute Korea Republic of

ISBN: (纸本)9781728117225

In this paper, a modified distance protection setting method is proposed to use the conventional distance relays for the transmission lines. the comprehensive studies regarding the impact of the thyristor-controlled series capacitor (TCSC) on a conventional distance relay are shown that the TCSC affects the operation of distance relays not only at the series compensated lines but also at the adjacent lines. the proposed method uses the equivalent impedance of the TCSC considering a metal oxide varistor (MOV), which is one of the overvoltage protection element for the TCSC to calculate the setting values which can prevent the mal-operation of the distance relays. To analyze and evaluate the performance of proposed method, a series of simulation studies were carried out with the PSS/E and PSCAD/EMTDC environment. © 2019 ieee.

关键词： Metals

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Research on Decision-making of Secondary Equipment Maintenance Based on Online Monitoring 8

Research on Decision-making of Secondary Equipment Maintenan...

引用

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

作者： Zhihao, Lu Jun, Li Shihao, Yang Songjie, Han Zhengjun, Lu State Grid Shanghai Municipal Electric Power Company Shanghai China Shanghai Shr Automation Co. Ltd Shanghai China

ISBN: (纸本)9781728117225

With the construction of new generation of intelligent substation, condition-based maintenance has become particularly important. Based on the characteristics of relay protection in the third-generation intelligent substation, the selection and optimization of condition evaluation indicators are discussed in this paper. the fault rate prediction models based on condition evaluation score and Weibull distribution are established respectively, and the regression effect of maintenance is considered, so the cumulative failure rate of equipment can be obtained more accurately. this provides a basis for maintenance decision-making. Finally, this paper synthetically considers the failure loss and maintenance loss in the maintenance cycle, and takes the minimum integrated cost as the objective function to construct the optimization model of maintenance decision-making. © 2019 ieee.

关键词： Failure rate

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A Discrete system Approach for Short-term Voltage Stability Analysis 8

A Discrete System Approach for Short-term Voltage Stability ...

引用

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

作者： Kang, Zhuoran Qian, Feng Chen, Minquan Liu, Junlei Li, Shangyuan Gan, Deqiang Cai, Qiuna Liu, Jie Zhejiang University School of Electrical Engineering Hangzhou China China Southern Power Grid Guangdong Dispatch and Operation Center Guangzhou Guangdong China

ISBN: (纸本)9781728117225

A key task in stability analysis is to solve a group of differential - algebraic equations. In this paper, a closed-form solution of the network equations is derived based on the familiar Dommel-Sato iteration. For different load models, we derive the corresponding closed-form network voltage expressions. After applying the improved Euler integration, a discrete system model of AC power grid dynamics is obtained. Examples using the proposed discrete system model are provided, and compared with the simulation results using BPA, a popular production-grade simulation software. © 2019 ieee.

关键词： Computer software

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Analysis of DFIG Terminal Voltage Oscillation Caused by Reactive power Compensation under Weak Grid Connection 8

Analysis of DFIG Terminal Voltage Oscillation Caused by Reac...

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

作者： Liu, Pai Ding, Lei Shandong University School of Electrical Engineering Jinan China

ISBN: (纸本)9781728117225

According to the wind farm codes, the doubly-fed induction generator (DFIG) is required to possess low voltage ride through (LVRT) capability during grid faults, especially reactive power compensation performance. However, under weak grid connected condition, the interaction between DFIG control system and grid may cause voltage oscillations at the point of common coupling (PCC). To investigate the mechanism of the oscillation phenomenon during LVRT, this paper establishes a reactive power compensation equivalent model, considering system transient characteristics, weak grid structure and rotor-side converter (RSC) controllers. the results of Nyquist criterion confirm that the transient stability of wind power system will be deteriorated with the increase of compensation gain value and grid impedance. A DFIG simulation model is built to verify the validity of the model and theoretical analysis. © 2019 ieee.

关键词： Wind farm

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Research on Balancing Control Technology of Series Dual Valve Groups in Hybrid Multi-terminal UHVDC Transmission system 8

Research on Balancing Control Technology of Series Dual Valv...

引用

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

作者： Yin, Yanjiao Ning, Lianhui Gao, Liang Liu, Niming Teng, Haodong Xi'an Jiaotong University Smart Power Grid Shaanxi Key Laboratory Xi'an China

ISBN: (纸本)9781728117225

the balancing control technology of series dual valve groups in hybrid multi-terminal UHVDC transmission system is studied in this paper. Firstly, the reason for the imbalance of the two valve groups is analyzed. It is shown that for the fixed-power control MMC converter station of the series double-valve structure, it is highly probable that the double-valve group will be unbalanced during the operation, so it is necessary to add the corresponding control strategy. then, a voltage balance control strategy based on voltage-power deviation between series two-valve groups and PI control is designed. Correcting the power setting value of the two valve groups due to the voltage deviation can effectively improve the equalization of the series double valve group. Finally, a simulation model is established in PSCAD to verily the feasibility and effectiveness of the proposed control strategy. © 2019 ieee.

关键词： power control

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Improvement Measures of Active Intervention Arc Suppression Technology 8

Improvement Measures of Active Intervention Arc Suppression ...

引用

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

作者： Qingpeng, L.I. Qin, Yang Rongrong, Zhang Jinwei, Q.I. State Grid Nanchang Power Supply Company Nanchang China

ISBN: (纸本)9781728117225

In order to solve the problems of active intervention arc suppression device, such as PT inrush current, overvoltage after arc extinction and low start-up sensitivity for high impedance grounding faults, an improved method which is the active intervention arc suppression device parallels with arc suppression coil is proposed in this paper. Its role for suppressing PT inrush current, post-overvoltage and significantly improving the start-up sensitivity is demonstrated. Effectiveness of the method is verified by experimental tests. the method combines the advantages of active intervention type arc suppression device and arc suppression coil, and it is ideal operation mode which is easy to implement. © 2019 ieee.

关键词： Electrolysis

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