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检索条件"机构=Key Laboratory of Power System Protection and Dynamic Security"

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Available transfer capability assessment considering parameters variety

Available transfer capability assessment considering paramet...

引用

7th IET International Conference on Advances in power system Control, Operation and Management, APSCOM 2006

作者： Gao, Yajin Li, Gengyi Zhou, Min 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)0863412467

Available transfer capability (ATC) determines the largest transfer that can be implemented in a certain direction across the power grid without violating security constraints. The uncertainties including load level, aging and maintenance of elements and weather conditions, which have great influence on power system operation should be taking into account when calculating ATC. Considering time-varying nature and uncertainty of system parameters, the time-dependent model is adopted to describe the effects of weather conditions, aging and maintenance on element fault rates. Time-varying restoration time and load are modeled using random variables. The sequential simulation technique is applied to sample the system states, then based on linear programming and DC power flow ATC calculation is proposed. The algorithm based on MATLAB 6.5 is developed. IEEE 14-bus test system is used to verify the presented approach.

关键词： Linear programming

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Research on the integrated criterion for single-phase reclosure of EHV transmission lines without shunt reactors

Research on the integrated criterion for single-phase reclos...

引用

2006 China International Conference on Electricity Distribution, CICED 2006

作者： Liu, Haofang Wang, Zengping Xu, Yan Ma, Jing 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)0863416381

The relation between the voltage at the end of the opened phase conductor (VATEOTOPC) and the sum voltage of the two healthy phases (SVOTTHP) are analyzed. An integrated criterion based on the relation is proposed to determine the fault nature of single-phase faults. The integrated criterion is simple in scheme and can be realized easily. It can distinguish between temporary and permanent faults effectively and has good adaptability to load currents and fault distances. Simulation tests show that the conclusions in this paper are correct.

关键词： Permanent fault Temporary fault The sum voltage of the two healthy phases(SVOTTHP) The voltage at the end of the opened phase conductor(VATEOTOPC)

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Research and simulation of shunt reactors used to EHV transmission lines

Research and simulation of shunt reactors used to EHV transm...

引用

7th IET International Conference on Advances in power system Control, Operation and Management, APSCOM 2006

作者： Xu, Yuqin Zhang, Li Liu, Lihua Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Qingnian road 204 Baoding China

ISBN: (纸本)0863412467

The power frequency over-voltage of EHV power transmission lines in three operating conditions, i.e., capacity effect of unloaded line, unsymmetrical faults and load shedding is analyzed. The shunt reactor's function to restrain the power frequency over-voltage is analyzed theoretically. Different compensation ratios and installment positions of shunt reactors are simulated in three operating conditions of 750 kV transmission lines through the software ATP/EMTP. From the simulation results, it is found that the shunt reactors can restrain the power frequency over-voltage in three operating condition effectively and the magnitude of the power frequency over-voltage will be lower with the compensation ratio of the shunt reactor becoming larger. In addition, when the shunt reactor is switched at the terminal of the transmission line, its effect restraining the power frequency voltage is the best compared with other two modes of connection in unloaded line with single power supply, unsymmetrical faults and load shedding. The method of operation for the shunt reactor is also discussed in this paper. Along with the expansion of the system capacity and the line's transmitted power, the method of operation that the shunt reactor is switched off from the system needs to be considered according to the power system's operation condition.

关键词： Electric lines

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Coordinated control strategy for UPQC and its verification

Coordinated control strategy for UPQC and its verification

引用

2006 IEEE power Engineering Society General Meeting, PES

作者： Peng, Li Qian, Bai Gengyin, Li IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei China

ISBN: (纸本)1424404932

This paper researches profoundly on the coordinated control of UPQC (Unified power Quality Conditioner). By analyzing the radical reasons of coupling effect between UPQC series unit and shunt unit, a simple and practical coordinated control strategy for UPQC series unit and shunt unit is proposed, i.e. by introducing corresponding voltage corrective link directly to UPQC series unit and shunt unit respectively, and by suitable mode of PWM in addition, the coupling effect between its series unit and shunt unit is eliminated fully. Therefore, the complex degree of the whole UPQC control system is simplified greatly. Combined with a power quality waveform tracking method based on H∞ control, the coordinated control between UPQC series unit and shunt unit is implemented by the proposed strategy. The experimental results indicate that the method can eliminate the steady-state phase shift and amplitude attenuation of the voltage tracking compensation of series unit and the current tracking compensation of shunt unit for UPQC. Finally, the unified power quality multi-function control of UPQC is achieved. ©2006 IEEE.

关键词： power quality

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Development of dynamic var compensator based on 12-pulse thyristor controlled reactor

Development of dynamic var compensator based on 12-pulse thy...

引用

IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

作者： Long, Yunbo Yu, Han Cui, Zhengpai Zhang, Jianhua Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping District Beijing 102206 China

ISBN: (纸本)1424401364

This paper analyzes characteristic harmonic currents of TCR and presents a method to reduce the harmonics by means of phase-shift transformer. It also introduces the constitution and implements methods of compensating device. Some key solutions for developing TCR device are introduced, such as reactive currents detection, control algorithm and the realization of controller based on ATmega128 microcomputer. Finally, the data of field test is analyzed. © 2006 IEEE.

关键词： Electric transformers

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Approach on detection of reactive and harmonic currents in single-phase circuit

Approach on detection of reactive and harmonic currents in s...

引用

IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

作者： Yu, Han Cui, Zhengpai Li, Sheng Liu, Qihui Long, Yunbo Zhang, Jianhua Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping District Beijing 102206 China

ISBN: (纸本)1424401364

This paper presents an approach to the detection of harmonics and reactive currents in single-phase circuit according to the orthogonal characteristic of sine function. The method is simple and practical, which cannot only detect the current component in the distorted current but can also obtain the sum of the active and reactive current. Meanwhile, the presented method possesses fine digital filtering characteristics, and has better qualities in real-time and dynamic response characteristics in comparison with the harmonics detection through the simulated low pass filter. The MATLAB simulation studies illustrate the effectiveness of the proposed method. © 2006 IEEE.

关键词： Low pass filters

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Modeling of VSC-HVDC and control strategies for supplying both active and passive systems

Modeling of VSC-HVDC and control strategies for supplying bo...

引用

2006 IEEE power Engineering Society General Meeting, PES

作者： Gengyin, Li Ming, Yin Ming, Zhou Chengyong, Zhao IEEE 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)1424404932

An equivalent continuous-time state-space model for VSC-HVDC in the synchronous dq reference frame has been established in the paper. Based on the model, relevant control strategies have been developed for the cases of supplying active and passive systems. The Multi-Input Multi-Output (MIMO) control schemes are emphasized in designing power controller and voltage controller. The scheme features feed forward compensation to decouple the d- and q-axis of the Voltage Source Converter (VSC) model, which ensures the independent control of active and reactive power, DC voltage and reactive power as well. Simulations have been performed on PSCAD/EMTDC, a visual design environment for power system studies. The validity of the mathematic model and the feasibility of the control strategies have been proved by the simulation results. © 2006 IEEE.

关键词： Synchronous machinery

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Reconfiguration of network skeleton based on discrete particle-swarm optimization for black-start restoration

Reconfiguration of network skeleton based on discrete partic...

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2006 IEEE power Engineering Society General Meeting, PES

作者： Liu, Yan Gu, Xueping IEEE 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)1424404932

The black start restoration of a power system after a complete blackout is a very important issue to safety of the power system. The reasonable network reconfiguration strategy is necessary for establishing the main network and restoring loads as soon as possible. A skeleton-network reconfiguration strategy is proposed in this paper. Through determining the skeleton network, the burden of network reconfiguration can be reduced effectively. The reconstructing processes are evaluated by a comprehensive index of network reconfiguration efficiency. Furthermore, discrete particle-swarm optimization is employed in reconstructing network skeleton and several relatively-optimal schemes can be obtained as the guidance of the system restoration. Application to the IEEE 30-bus power system shows that reconfiguration schemes derived from the strategy are effective under uncertain system situations and ensure that the following restoration be successful. © 2006 IEEE.

关键词： Electric power systems

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Subcell FDTD modeling of electrically thin dispersive layers using Z transforms

Subcell FDTD modeling of electrically thin dispersive layers...

引用

17th International Zurich Symposium on Electromagnetic Compatibility, 2006

作者： Jiao, Chaoqun Cui, Xiang Li, N. IEEE Key Laboratory of Power System Protection Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding 071003 Hehei Province China

ISBN: (纸本)3952299049

A novel technique for treating electrically thin dispersive layers with the finite-difference time-domain (FDTD) method based on Z transforms is introduced. The proposed model is based on the subcell technique, where the constitutive relations are locally averaged in the FDTD grid. The most significant feature of the proposed model is its ability to model rather complicated dispersive layers having multiple pole pairs. The model is validated with several numerical examples making comparison with the exact results.

关键词： Electromagnetic dispersion

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Direct torque control with space vector modulation for induction motors fed by cascaded multilevel inverters

Direct torque control with space vector modulation for induc...

引用

IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

作者： Yi, Wang Heming, Li Xinchun, Shi Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University 619 Yonghua North Street Baoding 071003 China

ISBN: (纸本)1424401364

Direct torque control (DTC) has achieved utilization on two-level inverters and three-level diode-clamped inverters, and it has high performance of speed control. But DTC hasn't been utilized to cascaded multilevel inverters at present. In this paper, a novel space vector modulation (SVM) approach for cascaded multilevel inverters is presented firstly. Then by combining it with the DTC approach based on SVM, the approach of using DTC to cascaded multilevel inverters is presented. And it is verified by using a three-cell cascaded frequency control laboratory system. The proposed approach solves the issues that switching state table is difficult to generate and switching frequency is not fixed, which is arisen from using conventional DTC to cascaded multilevel inverters. It will be of benefit to the utilization of DTC on the speed control of induction motors fed by cascaded multilevel inverters. © 2006 IEEE.

关键词： Induction motors

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