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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131-140 订阅

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Novel Fast Simulation Method for MMC in MTDC system Considering the Effect of Output Ripple Characteristics 8

Novel Fast Simulation Method for MMC in MTDC System Consider...

引用

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

作者： Zhuo, Chaoran Zhang, Xiaotian Zhang, Xiong Yang, Xu Xi'an Jiaotong University School of Electrical Engineering Xi'an China

ISBN: (纸本)9781728117225

the traditional thevenin/Norton equivalent Modular Multilevel Converter (MMC) modeling method can provide qualified accuracy in converter-level modeling. Nevertheless, when doing simulation of high voltage muti-terminal DC (MTDC) system, there are too many MMC sub-modules participate in the operation, the computer will consume a lot of computing time for voltage sorting computation of each submodule capacitor. As a consequence, when doing simulation in MTDC system, it is often impossible to perform simulation operations because too large the computational load. this paper provides a MMC modeling method without considering capacitor voltage sorting process, and meantime maintains high DC side output ripple characteristics. this proposal can satisfy the simulation in system level, applicable for mater-slave control strategy and provide high calculation accuracy even in short simulation running time. © 2019 ieee.

关键词： HVDC power transmission

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A Novel Fault Current Limiter for MMC-Based HVDC system 8

A Novel Fault Current Limiter for MMC-Based HVDC System

引用

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

作者： Huang, Qiang Zou, Guibin Gao, Houlei Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Ji'nan250061 China

ISBN: (纸本)9781728117225

In the modular multilevel converter (MMC)-based HVDC system, the fault current rises rapidly when a dc side fault occurs. To avoid the damage to the semi-conductors, fault current limitation is necessary. For the fault current limiter proposed in this paper, the current flows through the thyristers in the normal operation state, while it will flow through the current limiting resistors due to the turning off of the thyristers by the commutation capacitor when a dc fault occurs. To provide theoretical basis to the choice of the main parameters of the fault current limiter, this paper analyzed the current of every branch in the fault current limiter. the simulation results of the model built in PSCAD/EMTDC verified the correctness of the theoretical analysis and the effectiveness of the proposed fault current limiter. © 2019 ieee.

关键词： Fault current limiters

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Control Scheme of Y-connected Modular Multilevel Converter in Fractional Frequency Transmission system under Unbalanced Grid Fault 8

Control Scheme of Y-connected Modular Multilevel Converter i...

引用

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

作者： Yu, Ting Meng, Yongqing Yu, Jianyang Northwest University of Political Science and Law School of Foreign Languages Xi'an China Xi'an Jiaotong University Shaanxi Key Laboratory of Smart Grid Xi'an China

ISBN: (纸本)9781728117225

Y-connected modular multilevel converter (Y-MMC) is a new topology of direct AC/AC power conversion, with competitive application prospects in Fractional Frequency Transmission system (FFTS). To improve the uninterrupted operation capability of Y-MMC, the control strategy considering unbalanced grid fault is proposed in this paper. this paper proposes the mathematical model of Y-MMC under asymmetric grid conditions according to the symmetrical component method and superposition principle of linear systems. Based on the proposed mathematical model, positive and negative sequence current inner loop controller, and outer loop controller to suppress the negative sequence current are specially designed for the stable operation of Y-MMC under asymmetric grid conditions. the effectiveness of the proposed control strategy has been verified by the simulation results obtained from a 10 kV, 10 MW Y-MMC system built in MATLAB /Simulink. © 2019 ieee.

关键词： Linear systems

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Variable Droop Control for Wind Farm to Participate the system Frequency Regulation 8

Variable Droop Control for Wind Farm to Participate the Syst...

引用

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

作者： Wan, Tianhu Li, Hua Wang, Chen Kou, Peng State Grid Shaanxi Electric Power Research Institutes Xi'an China Xi'an Jiaotong University School of Electrical Engineering Xi'an China

ISBN: (纸本)9781728117225

this paper presents an adaptive frequency response control scheme for the large scale wind farm, which enables wind farm to participate the grid frequency regulation. the main advantage of this scheme is that, by adjusting the droop coefficient of each wind generator in response to its local wind speed, this scheme takes into account the wind speed difference among wind generators. Specifically, the droop coefficient of each wind generator is dynamically adjusted inversely proportionally to the local power margin, which is computed using the local wind speed. this way, the wind farm frequency support power is distributed among multiple wind generators in an adaptive and reasonable fashion. As a result, not only the wind farm frequency support performance is improved, but also the wind generator stability is ensured. Simulation results on the data collected from a real wind farm validate the effects of the proposed control scheme. © 2019 ieee.

关键词： Wind

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Study on Operation Characteristics of Wind power Grid-connected Doubly-Fed AC/DC Hybrid system 8

Study on Operation Characteristics of Wind Power Grid-connec...

引用

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

作者： Yang, Guoqing Wang, Jingjing Wang, Deyi Zhang, Shujie Li, Yanhe Xu, Yourui Xi'an University of Technology Institute of Water Resources and Hydro-electric Engineering Xi'an China State Grid Qinghai Electric Power Company Qinghai China

ISBN: (纸本)9781728117225

Aiming at the impact of large-scale wind power integration on the operation characteristics of HVDC, this paper builds an AC-DC hybrid double-fed HVDC system including wind power generation. In the PSCAD/EMTDC software, the steady-state and transient operation characteristics of wind power access system are studied. the results show that the system can reach stable operation within 0.2s when the system starts. When the three-phase short-circuit ground fault occurs, the DC voltage and active power of the system show a downward trend, after the 0.05 s fault removal, active power of line gradually restores stability under the action of regulator, but line voltage appears unstable. When one end is disconnected, the voltage and active power on the fault side change to zero instantaneously, and the other end has a small reduction, and then it can resume normal operation. © 2019 ieee.

关键词： Wind power

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Inspection Pattern for Smart Substations Based on Risk Analysis 8

Inspection Pattern for Smart Substations Based on Risk Analy...

引用

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

作者： Gao, Haixiang Miao, Lu Liu, Jianing Dong, Kai Lin, Xiangning Guangdong Power Grid Co. Ltd. Electric Power Dispatching and Control Center Guangzhou Guangdong China Huazhong University of Science and Technology Wuhan Hubei China

ISBN: (纸本)9781728117225

Substation inspection is one of the most vital and time-consuming tasks for non-attended smart substations. Nowadays, a constant-frequency inspection pattern is used for all the devices in a substation by most power grid companies. this inspection pattern fails to utilize the individual characteristics of each device and accumulated operational experiences, resulting in unnecessary waste and potential risks. In this paper, an optimization model is proposed to find the optimal inspection pattern for substation devices based on risk analysis. A Monte Carlo-based simulation method is proposed to solve the stochastic model. the method is verified by a test case with actual data obtained from a smart substation located in South China. © 2019 ieee.

关键词： Risk analysis

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A Review of On-line Condition Monitoring in power system 8

A Review of On-line Condition Monitoring in Power System

引用

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

作者： Guo, Chenxi Dong, Ming Yang, Xiaoxi Wang, Wensen Xi'an Jiaotong University State Key Laboratory of Electrical Insulation for Power Equipment Xi'an China State Grid Shaanxi Electric Power Research Institute Xi'an China

ISBN: (纸本)9781728117225

As a means of detecting and assisting maintenance of power equipment, on-line condition monitoring(CM) has been widely used in power generation, transmission, substation, distribution, consumption and other fields in the past few decades. this paper reviews current on-line condition monitoring techniques and development trends of condition monitoring. In the context of 'Ubiquitous Internet of things', on-line condition monitoring is surely a promising way towards reliable protection of electrical equipment. However, in spite of obvious progress and undoubted benefits, the on-line condition monitoring system has also experienced a large number of practical problems in the application process such as generally low data availability and reliability. Furthermore, statistics on relative standards show a dramatic blank in international standards of on-line condition monitoring. therefore, there is an urgent need that the international standards for condition monitoring should be set up as soon as possible. Corresponding areas for further research are also presented such as uncertainty evaluation, error modeling and evaluation system based on sequential control. It is intended that this review will provide the basis for future developments of safe and reliable on-line condition monitoring system. © 2019 ieee.

关键词： Condition monitoring

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Current Waveform Similarity Based Line protection Scheme for Distribution Network of DFIG Wind power Integration system 8

Current Waveform Similarity Based Line Protection Scheme for...

引用

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

作者： Wei, Yang Jiandong, Duan Tong, Chen Xi' An University of Technology Department of Electrical Engineering Xi'an China

ISBN: (纸本)9781728117225

Because of the difference of electromagnetic transient characteristics between doubly-fed induction generator(DFIG) and traditional power supply, the existing protection is difficult to adapt to the distribution line of high permeability DFIG wind power integration system. A new pilot protection scheme for distribution line based on waveform similarity of current is proposed in this paper. In order to improve the speed and reliability of identifying faults, the Hausdorff algorithm is used to compare the difference of current discrete data on both sides of the protected line at any time. the impact of bad data for the protection scheme is analyzed, and then a method to improve the algorithm's ability to resist bad data is proposed. A large number of tests show that the proposed line protection can identify the faults reliably and quickly with different fault type, fault positions and other conditions. the proposed protection scheme not only uses the normal sampling frequency, but also performs well in resisting noise. © 2019 ieee.

关键词： Wind power

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SVDD-Based protection for UHVDC Ground Electrode Line 8

SVDD-Based Protection for UHVDC Ground Electrode Line

引用

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

作者： Song, Xinyao Jiao, Zaibin Liu, Qingchen Teng, Yufei Li, Xiaopeng Xi'an Jiaotong University School of Electrical Engineering Xi'an China State Grid Sichuan Electric Power Research Institute Chengdu China

ISBN: (纸本)9781728117225

Aiming at the problem of unreasonable setting of action characteristic circle in Electrode line impedance supervision (ELIS), a new method based on support vector data description (SVDD) to reasonably set action characteristic circle is proposed, which can realize high-precision fault diagnosis of ground electrode line. through the analysis of impedance characteristics of ground electrode line during normal operation, the characteristic that the radius of the action characteristic circle change with the length of the electrode line has been proved. the normal operating impedance considering the error of line parameters is taken as training sample, the trained SVDD model contains the optimal action characteristic circle. the simulation results show that the proposed method can obtain the optimal action characteristic circle through optimal calculation, and the accuracy of the proposed method for fault diagnosis of ground electrode line is significantly higher than that of ELIS. © 2019 ieee.

关键词： Failure analysis

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Research on power Grid Fault Diagnosis Based on Bayesian Information Fusion 8

Research on Power Grid Fault Diagnosis Based on Bayesian Inf...

引用

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

作者： Wang, Zhiyuan Gao, Zhanjun Yin, Huanhuan Zhang, Jianlei Shang, Cunzheng Shandong University Ministry of Education Key Laboratory of Power System Intelligent Dispatch and Control Jinan China Qilu Normal University Jinan China

ISBN: (纸本)9781728117225

this paper proposes a power grid fault diagnosis method based on cluster analysis. the method uses multi-source fault information to determine faulty components, and it can get accurately result in the absence of information. the multi-source fault information used in this paper includes wide-area system measurement information, fault recorder information and protection action information. the method firstly uses multi-level information analysis method to analyze the power grid fault information, extracts the fault features, and determines the suspicious fault component set through the clustering result and the switch action information. then using the improved Bayesian probability model to fuse fault information and identify faulty components. Finally, this paper verifies the effectiveness and feasibility of the proposed method through concrete examples. © 2019 ieee.

关键词： Cluster analysis

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