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2008 Joint International Conference on power system Technology powerCON and IEEE power India Conference, powerCON 2008

作者： Fei, Wang Zengqiang, Mi Qixun, Yang 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)9781424417629

The comparison between Hilbert space based power theory and three other power theories including traditional power theory , instantaneous power theory put forward by Akagi and Fryze power theory are analyzed in this paper. Theconsistency and difference are indicated in several different aspects: physical meaning, mathematical concept and the derivation of expressions. Analyses shows that traditional power theory can be regarded as a special case of Hilbert space based power theory, in other words, Hilbert space based power theory can be regarded as the generalization of traditional power theory. Fryze power theory is in accordance with Hilbert space based power theory in single-phase nonsinusoidal system, instantaneous power theory is in accordance with Hilbert space based power theory in three- phase symmetrical system without zero-sequence component. The definition of active current in Hilbert space based power theory is different from it in instantaneous power theory in three-phase system. © 2008 IEEE.

关键词： Hilbert spaces

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A spatial information-based self-adaptive differential evolution for distribution substations location and sizing

A spatial information-based self-adaptive differential evolu...

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2008 Pacific-Asia Workshop on Computational Intelligence and Industrial Application, PACIIA 2008

作者： Nian, Liu Jianhua, Zhang Wenxia, Liu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Changping Beijing 102206 China

ISBN: (纸本)9780769534909

The location and sizing of distribution substations integrated with urban spatial information is a optimization problem which primary characteristics are the existence of many suboptimal cost peaks and the solution space is on a discrete floating-point variables rage with some unfeasible area constraints. To solve this problem, a spatial information based parameter selfadaptive schema of DE (ISADE) is proposed The populations are formulated by spatial coordinates of candidate substation locations which chosen randomly and attempt to cover the entire planning area. A randomized self-adaptive scheme for DE mutation weighting factor F is used to increase the ability of searching out the global solution. The effectiveness of the proposed method is then tested on two practical substation planning areas of Beijing Electric power Corporation and the results are compared with PSO and standard DE. © 2008 IEEE.

关键词： Location

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Closed loop test platform for SVC controller based on RTDS

Closed loop test platform for SVC controller based on RTDS

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11th International Conference on Electrical Machines and systems, ICEMS 2008

作者： Xiangning, Xiao Yang, Zhao Yan, Zhang Meng, Ye Xiaoning, Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Beijing China Beijing Electric Power Corporation Beijing 100020 China

ISBN: (纸本)9787506292214

Real time test is a necessary step for the control device of equipment before it is installed in power system. In this paper, a closed-loop test platform which is based on Real Time Digital Simulator (RTDS) is established to test the performance of FACTS device controller. In this paper, Static Var Compensator (SVC) which is installed in a power plant is used for damping Sub Synchronous Oscillation (SSO) excited by fixed series compensator installed in the transmission line which is to improve the power transfer capability. The control approach, operation mode and the install location of SVC are studied in this paper and the real controller performance has been verified by the proposed test platform. Beside, this platform can also used for the test of performance of other FACTS devices controller.

关键词： Static Var compensators

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Improved differential evolution algorithm for economic dispatch of power systems

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2008年第10期28卷 100-105页

作者： Liu, Zi-Fa Zhang, Jian-Hua Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

An improved differential evolution (IDE) algorithm was presented for power system load economic dispatch (ED), a classical nonconvex, nonlinear, combinational optimization problem. Despite for its simplicity and high-efficiency, differential evolution (DE) algorithm is prone to local optimal solution sometimes. Based on analysis of DE searching mechanism, IDE algorithm adopts adaptive control parameters according to swarms' distribution condition and the overlapping individuals undertake chaotic searching to improve its robust and global optima searching capability. The proposed IDE algorithm was tested on two systems consisting of 3, 40 and 69 thermal units whose incremental fuel cost function took into account the valve-point effects. The results indicate that IDE algorithm outperforms DE, GA, and PSO algorithms in solving load dispatch problems.

关键词： Electric power systems

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Control strategy of VSC-HVDC in dual-infeed HVDC systems

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2008年第7期28卷 97-103页

作者： Zhao, Cheng-Yong Sun, Ying Li, Guang-Kai Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Baoding 071003 China

Aim at the stability problem of multi-infeed direct current (MIDC) systems, voltage source converter based HVDC (VSC-HVDC) was applied to MIDC systems for improving the voltage characteristic of common AC bus in MIDC systems. A physical model of a dual-infeed HVDC and VSC-HVDC system was set up, and its mathematical model was developed. The rectangular coordinate form of VSC's power transmission equations was deduced through coordinate conversion. Based on the inverse system method for multivariable nonlinear control, the nonlinear controllers of VSC-HVDC system were designed. Simulation results performed on PSCAD/EMTDC show that the designed nonlinear controllers of VSC-HVDC can improve effectively the dynamic character of VSC-HVDC system, stabilize effectively the voltage of dual-infeed HVDC and VSC-HVDC system when AC side is disturbed, reduce the probability of commutation failure in the inverter of HVDC systems, and increase the operation reliability of HVDC systems.

关键词： HVDC power transmission

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Phase-selector based on voltage modal fault component

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Dianli Xitong Zidonghua/Automation of Electric power systems 2008年第9期32卷 42-46+99页

作者： Wang, Xingguo Huang, Shaofeng Liu, Qiankuan Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

The characteristics of voltage modal transformation based on fault component in fault location and protection location are discussed in detail with regard to the changes of the system parameters and fault types. A new phase-selector based on voltage modal fault component is proposed. It uses voltage fault component and works fast after a fault occurs. A fault selection scheme is also proposed to solve problems of sensitivity as faults located on remote end of transmission lines. The simulation results of ATP and MATLAB show the feasibility of the scheme.

关键词： Electric power systems

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New algorithm to distinguish the transferring fault of transformer protection based on morphological gradient

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2008年第22期28卷 75-80页

作者： Zheng, Tao Gu, Jun Huang, Shao-Feng Wang, Zeng-Ping Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

Distinguishing the transferring fault is one of difficulties for transformer differential protection. According to CT (current transformer) saturation characteristic, a new algorithm of distinguishing the transferring fault is put forward. As the primary current of CT crosses zero, a small linear transmission part of CT would appear, no matter how CT saturated. Based on this characteristic, the waveform of the differential current would expose discontinuous parts when an external fault occurred;in contrast, this phenomenon would not appear for an internal fault. The morphological gradient is adopted to deal with the waveform between two adjacent extremal points of the differential current. By dividing the gradient waveform into three parts and calculating each part's area, the discontinuous in the differential current could be detected according to the relative size of three above areas. By judging whether the discontinuous parts are existed in the differential current, the transferring faults could be easily distinguished. Simulation results show that this algorithm can distinguish the internal fault, external fault and the fault transferred from the external to the internal under the condition of CT saturation.

关键词： Electric instrument transformers

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dynamic state estimator based on WAMS during power system transient process

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2008年第7期28卷 19-25页

作者： Qin, Xiao-Hui Bi, Tian-Shu Yang, Qi-Xun Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

As a measurement tool, wide area measurement system (WAMS) has the measurement error and bad data unavoidably. If the raw data is applied direcdy, the unpredictable consequence will be resulted in. Aiming at this problem, a novel dynamic state estimator for generator state variables is proposed. The mathematical model and the flowchart of the algorithm are described. Bad data detection and elimination approach is given as well. The simulation results show that the proposed method can provide the estimated trajectories of the generators in real-time, which eliminates the impact of measurement error and bad data and gives the backbone for WAMS based dynamic applications and real-time control.

关键词： Electric power systems

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PREDICTION ANALYSIS IN NONLINEAR systemS

PREDICTION ANALYSIS IN NONLINEAR SYSTEMS

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2008 International Conference on Machine Learning and Cybernetics(2008机器学习与控制论国际会议)

作者： YA-GANG ZHANG PO ZHANG ZENG-PING WANG Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry

The prediction analysis in nonlinear systems will be discussed carefully in this paper. We are mainly using CM (1,1) model to forecast data sequences, and the usual forecast precision is approximate to 90％. In this place we have found a generating rule that may realize chaotic synchronization at least in short and medium term, and we can analysis and forecast in this way. We hope to offer an effective prediction method to study certain properties of DNA base sequences, 20 amino acids symbolic sequences of protein structure, and the time series that can be symbolic in finance market et al.

关键词： Grey Prediction Chaotic Synchronization Symbolic dynamics Nonlinear system

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Comparison between Periodic Function Space based power Theory and Traditional power Theory

Comparison between Periodic Function Space based Power Theor...

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11th International Conference on Electrical Machines and systems(第11届国际电机与系统会议)

作者： Fei Wang Qixun Yang Zengqiang Mi North China Electric Power University/Key Laboratory of Power System Protection and Dynamic Security North China Electric Power University/Key Laboratory of Power System Protection and Dynamic Security

The comparison between Periodic Function space based power theory and three other power theories including traditional power theory, instantaneous power theory put forward by Akagi and Fryze power theory are analyzed in this paper. The consistency and difference are indicated in several different aspects: physical meaning, mathematical concept and the derivation of expressions. Analyses shows that traditional power theory can be regarded as a special case of Periodic Function space based power theory, in other words, Periodic Function space based power theory can be regarded as the generalization of traditional power theory. Fryze power theory is in accordance with Periodic Function space based power theory in single-phase nonsinusoidal system, instantaneous power theory is in accordance with Periodic Function space based power theory in three-phase symmetrical system without zero-sequence component.

关键词： Reactive power Voltage power system harmonics Space technology Laboratories power system protection power system dynamics power system security Monitoring Control systems

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