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检索条件"机构=Key Laboratory of Power System Protection and Dynamic Securty Monitoring and Control"

共 605 条记录，以下是11-20 订阅

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RETRACTED ARTICLE: Experimental study on power flow reversal of VSC-HVDC

RETRACTED ARTICLE: Experimental study on power flow reversal...

引用

2011 IEEE power Engineering and Automation Conference, PEAM 2011

作者： Yang, Yongchun Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding China

ISBN: (纸本)9781424496884

Both peak-regulating of the connected power grid using VSC-HVDC in normal or emergency power support each other in the case of both sides of AC system have fault via VSC-HVDC, are dependent on its rapid reversal of power flow at any time according to *** the mathematic model and control strategy of rectifier and inverter in two phase synchronous rotating coordinate is given, then an open physical experimental device of VSC-HVDC that has upper and lower controller is set up. To maintain the stabilization of the DC bus voltage and suppress the current, active power oscillation in the power flow reversal progress of VSC-HVDC ,a lot of experiments are carried out, the rusults show that the power flow can transit smoothly when the control objectives change and the experimental device of VSC-HVDC has good dynamic performance. © 2011 IEEE.

关键词： Electric power system control

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key technologies of three-terminal DC transmission system based on modular multilevel converter

Key technologies of three-terminal DC transmission system ba...

引用

International Conference on Electric Utility Deregulation and Restructuring and power Technologies

作者： Yang, Xiaodong Zhao, Chengyong Hu, Jing Wang, Jing Yang, Liu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

ISBN: (纸本)9781457703638

A three-terminal DC transmission system based on modular multilevel converter (MMC) is developed to solve the problem of power supply for distributed islands or cities. The system, with flexible features, may generate high quality output voltage and reduce construction costs and power losses in the converter stations. However, the three-terminal DC system based on MMC faces more complex situations in operation and its control strategies. In this paper, the mathematic model of three-terminal DC system based on MMC is deduced. Then according to the structure of MMC, a method of carrier phase-shift SPWM is introduced. As the system-level control, the decoupling controller for three-terminal DC system based on MMC is designed. A multi-point DC voltage control strategy based on DC voltage error method, which doesn't need communication between converter stations, is proposed to improve the system reliability. By simulation with PSCAD/EMTDC, the feasibility and effectiveness of the proposed model and control strategies are verified. © 2011 IEEE.

关键词： Voltage control

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High-power controllable current quality disturbance generator

High-power controllable current quality disturbance generato...

引用

International Conference on Electric and Electronics

作者： Gu, Ren Xiao, Xiangning Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing 102206 China

ISBN: (纸本)9783642216961

This paper proposes a high-power controllable current quality disturbance generator, which is composed of multiplex cascade H bridge modules, and simulates current quality problems, such as positive and negative current distrubance, current fluctuation, harmonic current and so on. The device adopts a topology with decoupling fundamental and harmonic current. A power module parallel-connected on the fundamental connection reactance outputs harmonic current, while cascade fundamental power modules generate fundamental and low order harmonic current, which realizes decoupling control of fundamental and harmonic current. This paper proposes the control strategies of all types of current disturbances, and the EtherCat-based controller. Finally, a 10kV/1MVA controllable current quality disturbance generator has been created. The experiment result proves that the proposed main circuit topology, control strategy and EtherCat-based controller are feasible and efficient. The emergence of this device creates a fundamental platform for measurement, analysis, evaluation and control of current quality in grid. © 2011 Springer-Verlag Berlin Heidelberg.

关键词： controllers

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High-power controllable voltage quality disturbance generator

High-power controllable voltage quality disturbance generato...

引用

International Conference on Electric and Electronics

ISBN: (纸本)9783642216961

This paper proposes a high-power controllable voltage quality disturbance generator, which is composed of multiplex cascade H bridge modules, and simulates many types of voltage quality problems, such as voltage swell and sag, fluctuation and flicker and so on. One side of the device connects the power system with cascade H bridge to improve voltage level. The other side connects the system directly to aviod the problems caused by series transformer, such as additional phase shifting and voltage drop. Cascade inverter H bridge modules and PWM rectifier H bridge modules are all controlled by triangular carrier phase shifting to increase the equivalent switching frequency of inverter to simplify the control. Finally, a 10kV/2MVA controllable voltage quality disturbance generator has been created. The experiment result proves that the proposed main circuit topology, control strategy and EtherCat-based controller are feasible and efficient. © 2011 Springer-Verlag Berlin Heidelberg.

关键词： Bridge circuits

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The analysis and simulation of commutation failure and protection strategies

The analysis and simulation of commutation failure and prote...

引用

International Conference on Electric Utility Deregulation and Restructuring and power Technologies

作者： Wang, Jing Zhao, Chengyong Hu, Jing Yang, Xiaodong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing 102206 China

ISBN: (纸本)9781457703638

Studying the HVDC typical fault-the commutation failure and its protection measures will give some guidance for HVDC engineering, also, it will improve the AC-DC power system safety and reliability with great significance. Based on the analysis of commutation failure of HVDC, the article studies the effect of the commutation failure when the commutation buses have different kinds of AC faults on the base of CIGRE HVDC benchmark model, with the simulation of PSCAD/EMTDC. This in-depth analysis of the causes of commutation failure, the type and characteristics of the fault will be done in this paper. Basis for the characteristics of HVDC system, combined with AC transmission relay protection tuning principle, conservation and protection action principle approach, are given to promoting HVDC transmission should take measures to return to normal. The simulation results show that the HVDC transmission recovers from commutation failure effectively after the fault is cleared due to the high controllability of the system and the reasonable protection strategies. © 2011 IEEE.

关键词： Electric commutation

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Credibility theory applied for estimating operating reserve considering wind power uncertainty

Credibility theory applied for estimating operating reserve ...

引用

2011 IEEE PES Trondheim powerTech: The power of Technology for a Sustainable Society, powerTECH 2011

作者： Xue, Zhiying Li, Gengyin Zhou, Ming Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping 102206 Beijing China

ISBN: (纸本)9781424484195

The estimation of operating reserve to guarantee the system security and economic operation is an important task in power system operation. With the rapid increase of wind power installation and its large scale integration into power systems, the uncertainty of wind power should be considered in operating reserve estimation. This paper discusses the risk from wind power forecast error and introduces the idea of wind power at risk. The total risk due to wind power forecast error is studied from two different aspects, and two sets of indices are proposed. Credibility theory is applied to get the comprehensive index which is used to estimate operating reserve. Numerical tests are done to compare the proposed approach with others. The results show that the proposed approach can give more economic operating reserve estimation without loss of system security, which may be a reference for the power systems with large scale intermittent generation to estimate operating reserve. © 2011 IEEE.

关键词： Wind power

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New type of wide area fault location algorithm based on posterior viewpoints

New type of wide area fault location algorithm based on post...

引用

IASTED International Conference on power and Energy systems and Applications, PESA 2011

作者： Wang, Zengping Zhang, Yagang Zhang, Jinfang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China

ISBN: (纸本)9780889869059

The aim of relay protection is to isolate the fault zone or device and guarantee the system security. The primary protection and backup protection is in cooperation relationship, and backup one could not be canceled because of the DC power supply failure in substation. The fault location algorithm based on wide area information is one of the key points for novel wide area backup protection. By use of the synchronized phasor data uploaded by PMUs, the process of locating fault could be implemented in real-time or near real-time level. In this paper, based on Bayesian theory, we have studied the fault location in wide area backup protection systems. The simulation experiments have confirmed that the detection of fault can be resolved exactly and effectively by Bayesian theory.

关键词： Relay protection

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Optimal Planning of Substation Locating and Sizing Based on Adaptive Niche Differential Evolution Algorithm

Optimal Planning of Substation Locating and Sizing Based on ...

引用

2011 4th International Conference on Electric Utility Deregulation and Restructuring and power Technologies(第四届电力设施管制、重建及能源技术国际会议 DRPT 2011)

作者： Liu Zifa Liu Xing Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of

To deal with reactive power optimization problem,an adaptive Niche Particle Swarm Optimization algorithm (ANPSO) is *** Evolution algorithm (DE) is easy to use and has the advantages of strong robustness,but its efficiency is limited and probably to fall into local optimum because the population loss of diversity after several *** introduces niche-sharing mechanisms to change the individual values and accelerates to eliminate individuals which have low *** radius can also be adjusted adaptively on the basis of the relative distance between individuals which reflect the aggregation of *** the above method,algorithm's global searching ability is *** proposed algorithm is tested on a realistic planning project and the results show its better performance on celerity,accuracy and efficiency.

关键词： power system planning:power distribution:differential evolution algorithm:niche

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The Application of Complex Torque Coefficient Method in Multi-generator system

The Application of Complex Torque Coefficient Method in Mult...

引用

The 2011 International Conference on Electric and Electronics(EEIC 2011)

作者： Kun Xu Chengyong Zhao Jie Zhang Chunlin Guo Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University

A multi-input and multi-output linear model of multi-machine power system was established based on perturbation analysis, and the complex torque coefficient of target generator was deduced in detail. From a mathematical perspective, the meaning of complex torque coefficient was explained. Meanwhile, the reasonability about non-target generators being equivalent to different models was discussed when investigating subsynchornous oscillation phenomenon in a multi-generator system. The results showed that the complex torque coefficient method was suitable for multi-generator system and the procedure of simplifying non-target generator as single rigid body or voltage sources with fixed frequency was inappropriate. Then a case study of IEEE second benchmark verified the conclusions above.

关键词： complex torque coefficient subsynchronous oscillation multigenerator system

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Sliding mode variable structure direct power control of permanent-magnet direct drive generator

Sliding mode variable structure direct power control of perm...

引用

International Conference on Electrical and control Engineering (ICECE)

作者： Niang Tang Xiang-ning Xiao Jing Guo Shuang-ya Zhou Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing China

The pulse width modulation technique and dynamic operating mode characteristics of direct drive permanent magnet synchronous generator (PMSG) are researched firstly. A novel sliding mode variable structure directed power control algorithm applied to PMSG is proposed, and then design the controller using tip speed radio and flux-weakening control scheme. It can not only provide a constant switching frequency without involving any synchronous speed coordinate transformation and generator side phase information, but also can reduce the capacitance of generator-side converter. Simulation and experimental results show that the proposed theoretical analysis method and control strategy is effective under the platform PSCAD/EMTDC.

关键词： Reactive power power control Wind speed Generators Permanent magnets Switches

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