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

共 589 条记录，以下是321-330 订阅

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Study on power factor through the similarity of waveform

Study on power factor through the similarity of waveform

引用

IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： L.X. Zhou Z.D. Yin X.N. Xiao Z.Q. Wang L. Zheng Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China North China Power Grid Xingtai Power Supply Corporation Xingtai China

With the rapid development of electric electronic technology, non-linear loads, large capacity converters, etc. increase mostly, which brings about the serious problems such as harmonics. Thus, the traditional power theory based on the average is unable to meet with the practical require. In this paper, the power definition in the sinusoidal and non-sinusoidal circuit is discussed and the waveform similarity between voltage and current is analyzed due to the criterion of minimum mean square deviation. Furthermore, the relationships among the waveform similarity factor, displacement power factor and real power factor are also discussed. The results show that power components are well analyzed in use of waveform similarity under the conditions of non-sinusoidal. At the same time, waveform similarity provides a simple but effective method for the calculation of power factor.

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Experimental study on relationships between partial discharge signals and apparent discharge magnitude in XLPE cable

Experimental study on relationships between partial discharg...

引用

International Conference on Condition monitoring and Diagnosis, CMD

作者： Wei Wang Xu Cheng Chong Liu Fei Zong Xueliang Shen Beijing Key Laboratory of High Voltage & EMC Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China Beijing Electric Test and Research Institute Beijing China

ISBN: (纸本)9781424416219

Based on the experiment carried out in the lab on several cables in which there are some typical PD models, the relationship between the single acoustic signal generated by the partial discharge and the apparent discharge magnitude in a line frequency cycle are researched. Further more, through the detection system which is combined of the VHF PD detection method and the acoustic emission detection method, the expressions of the relationship between the voltage value, which is gotten directly from the detection system and the apparent discharge magnitude are gotten by the curve fitting method. At the same time, the method of locating the defect manually with the acoustic sensor is introduced simply in the paper.

关键词： Partial discharges Acoustic signal detection Acoustic emission Cables Signal generators Frequency Voltage Fault location Curve fitting Acoustic sensors

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A novel approach to eliminate zero-sequence harmonics current

A novel approach to eliminate zero-sequence harmonics curren...

引用

IEEE Asia-Pacific Conference on Circuits and systems

作者： Qipeng Song Zhongdong Yin Chengxi Dai Changyin Zhang Weidong Shang Zhonghua Huang Key Laboratory of Power System Protection and Dynamic Monitoring and Control Ministry of Education University Beijing China Kaifeng Power Supply Corporation Kaifeng China Kaifeng Power Supply Corporation The state grid corporation of China Kaifeng

Zero-sequence harmonics caused by nonlinear loads usually result in high voltage distortion levels throughout the facility, neutral conductor overloading, motor heating, transformer heating, increased losses, and excessive harmonic injection onto the utility supply system. This paper presents a novel method to eliminate zero-sequence harmonics by using Zero-sequence Resister Block (ZRB) and Zig-Zag transformer. Zig-Zag transformer is a special connection of three-phase transformerpsilas windings. The ZRB is also a special connected transformer, whose three windings are wounded in the same core. The ZRB has zero reactance for positive and negative-sequence components but giving three times of self-reactance for zero-sequence reactance. In this paper, an analysis is carried out; simulations and laboratory tests are used to evaluate the performance of the Zig-Zag transformer and ZRB under various system conditions. The simulation and laboratory test results indicate that the combination of ZRB and Zig-Zag transformer as filter is a better and effective way to attenuate the neutral current, which also provides an innovational way to improve power quality.

关键词： power harmonic filters Heating Laboratories Harmonic distortion Conductors Transformer cores Performance analysis Analytical models system testing power quality

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Study of reactive power optimization based on Artificial Immune Ant Colony Algorithm

Study of reactive power optimization based on Artificial Imm...

引用

International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Siqing Sheng Jing Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Student power system and itns automation North China Electric Power University Baoding Hebei China

This paper presents an algorithm for optimizing reactive power using Artificial Immune Ant Colony Algorithm. This hybrid algorithm uses artificial immune algorithm (AIA) to give pheromone to distribute and makes use of Ant Colony Algorithm (ACA) to give the optimal solution. The ACA has been improved. The improved ACA uses the best and worst ant to update the pheromone trails and pseudorandom proportional rule. Local pheromone update mechanism, pheromone limitation and adaptive pheromone decay coefficient are increased. The objective function of the proposed algorithm is to minimize the system active power loss. This algorithm has been applied to practical IEEE 30-bus system and shows better results and convergence rate as compared to other optimal methods.

关键词： Reactive power Ant colony optimization power system security power system stability Propagation losses Constraint optimization Feedback power system protection power system dynamics Mathematical model

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Detection method of partial discharge in XLPE Cable accessories based on the method of VHF combined with acoustic emission

Detection method of partial discharge in XLPE Cable accessor...

引用

International Symposium on Electrical Insulating Materials

ISBN: (纸本)9784886860057

Based on the experiment carried out in the lab on several cable accessories in which there are some typical PD models(In this paper, they are the models of protrusion discharge and floating discharge), the method of VHF Combined with acoustic emission (AE) for detecting PD in the XLPE cable accessories was introduced. The time domain characters of the AE and VHF signals are researched and compared in order to distinguish the PD signal from the disturbance. Two kinds PD spectrum of Qmax-phi and N-phi were analyzed and contrasted between the VHF and acoustic emission PD signals, which are protrusion discharge and floating discharge. The way to locate the PD point was also introduced. The results of the research had proved that the reliability of the PD detection is improved using the combined method.

关键词： Partial discharges Acoustic emission power cables Discharges Joints Fault location Acoustics

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A novel coordinated control strategy for improving the stability of frequency and voltage based on VSC-HVDC

A novel coordinated control strategy for improving the stabi...

引用

International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Chengyong Zhao Lei Li Guangkai Li Chunyi Guo Key Laboratory of Power System Protection and Dynamic Security Monitoringand Control under Ministry of Education North China Electric Power University Baoding Hebei China

At the early stages of electric network restoration, the capacity of power system is relatively small, and adding large power load to such a power system will result in severe fluctuation of system frequency and voltage. Thus the stable operation and the restoration speed of power system will be affected seriously. VSC-HVDC (voltage source converter based HVDC) can control active and reactive power injected into network independently and rapidly. Based on the characteristics of VSC-HVDC, a coordinated control method between VSC-HVDC and conventional speed governing system is proposed to maintain the stability of frequency at the early stage of network restoration. Similarly, a coordinated control method between VSC-HVDC and automatic voltage regulator (AVR) is proposed to maintain the stability of bus voltage. The whole system model is established in RTDS environment. Simulation results show that the fluctuations of frequency and voltage are diminished remarkably, and the stability is improved by adopting the method proposed. It's conducive to expediting the restoration process of power system.

关键词： Voltage control Frequency power system stability power system restoration Converters power conversion Fluctuations power system modeling power system simulation HVDC transmission

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Study on a Super Capacitor Energy Storage system for improving the operating stability of Distributed Generation system

Study on a Super Capacitor Energy Storage system for improvi...

引用

International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Juanhua Wang Jiancheng Zhang Yun Zhong Key Laboratory of Power System Protection and Dynamic Security Monitoringand Control under Ministry of Education North China Electric Power University Baoding Hebei China

A super capacitor energy storage (SCES) can be used as energy storage element of DG (distributed generation) system and provides necessary energy buffering. And it plays a very important role in improving operating stability of power system. Based on a wide voltage change scope of the SCES system, its main circuit has been designed in this paper, where bi-directional DC-AC-DC converter is regarded as transition circuit. The working situations of the SCES system under different loads have been analyzed in detail, and the corresponding system unified model is established when super capacitor is charged or discharged. According to the operating mechanics of SCES system, the relation between the stability of DG system and SCES system has been analyzed, and a better control scheme has also been designed. At last, the investigation of the SCES system and its control strategy are done with the use of exact simulation model. The simulation results verify the validity of designed scheme and the flexibility of control system.

关键词： Capacitors Energy storage Distributed control power system stability Circuit stability control system synthesis Buffer storage power system analysis computing Voltage Bidirectional control

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Research on Failure Risk Assessment and Maintenance Tactics of Transformer based on the Extension Engineering Method and IAHP

Research on Failure Risk Assessment and Maintenance Tactics ...

引用

International Conference on High Voltage Engineering and Application, ICHVE

作者： Qing Xie Yun Li Yunpeng Liu Yanqing Li Fangcheng Lv Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding Hebei China Wuhan High-Voltage Research Institute Baoding Hebei China

There are many failure modes of transformer, and their probability and failure severity differ from each other. Based on the statistic data and experts advice, the probability of all failure modes are calculated, and divided into 5 grades. Meanwhile, IAHP was applied to calculate the weight of the transformer failure information, and Extension evaluation method was employed to create the frame work of the severities of failure modes qualitatively and divided them into 5 grades as well. Then, risk matrix is adopted to describe risk grades of failure modes, and power transformer risk maintenance strategies are obtained.

关键词： Risk management power transformers Failure analysis Risk analysis power system security Maintenance power system reliability power engineering and energy Probability protection

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Neural Network Approaches to Unimodal Surjective Map Chaotic system Forecasting

Neural Network Approaches to Unimodal Surjective Map Chaotic...

引用

International Symposium on Intelligent Information Technology Application, IITA

作者： Yagang Zhang Po Zhang Xiaozhe Wang Zengping Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding China Center for Nonlinear Complex Systems Yunnan University Kunming China

The forecasting using neural networks in unimodal surjective map chaotic dynamic system will be studied carefully in this paper. And most of the forecasting precision has exceeded 90%. Because of the intrinsic property of chaos, the forecasting precision will decrease as the length of symbolic sequence is increasing. But 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. Nonlinear dynamics maintain manifold links with biologic information system. We also hope to offer an effective prediction method to study certain properties of DNA base sequences, 20 amino acids symbolic sequences of proteid structure, and the time series that can be symbolic in finance market et al.

关键词： Neural networks Chaos Sequences Economic forecasting Nonlinear dynamical systems Information systems Prediction methods DNA Amino acids Finance

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A power price forecasting method based on nonparametric GARCH model

A power price forecasting method based on nonparametric GARC...

引用

3rd International Conference on Deregulation and Restructuring and power Technologies, DRPT 2008

作者： Hong, Li Hao, Xiong Weiguo, Li Yi, Sun Guoyi, Xu IEEE North China Electric Power University Wuhan University Beijing Institute North China Electrical Power University Electrical Engineering School North China Electric Power University Beijing China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control

ISBN: (纸本)9787900714138

Based on nonparametric conditional heteroscedasticity estimation theory, an improved power price forecasting method is proposed in this paper. In this method, according to the practical power price curve, conditional variance function is built and the model is determined by nonparametric estimation method. Besides, in the nonparametric estimation process, the iterative estimation algorithm is introduced to deal with the problem where conditional standard deviation is unpredictable. And the estimation credence of conditional variance function is improved by continually modifying the estimation value of conditional standard deviation as input variance. On the research of day-ahead time series fluctuation characteristics of power price in California in 2000, the time series of Humb node is modeled and forecasted. And the test results show that the model proposed in this paper can better reflect time series volatility clustering characteristics of power price, and it can improve forecasting effect of peak power price by using nonparametric estimation theory. © 2008 DRPT.

关键词： Time series

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