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

作者： Zeqian Mao Li Zhang Xueshan Han Ji Feng Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

ISBN: (纸本)9781467371070

Effect of voltage hasn't been considered reasonably in existing loss allocation methods. Aiming at the problem, the impact of voltage on the loss allocation method based on circuit theory is deeply discussed in this paper. Firstly, the two node equivalence modes and principles of the branch loss allocation method are investigated. Then the relationship between voltage and the loss under different node equivalence modes is analyzed on the premise that all nodes' injection currents are fixed, so as to keep the influence of current on loss allocation constantly at different voltage levels. The analysis and simulations reveal that none of the methods can reflect the effect of voltage on loss allocation, and this is due to node equivalence rather than branch allocation principle. So a more reasonable node equivalence should be developed to reflect the influence of voltage on loss allocation.

关键词： Resource management Power industry Circuit theory

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Modeling of electric vehicle loads applicable to power system quasi-steady state analysis

Modeling of electric vehicle loads applicable to power syste...

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

作者： Yingle Fan Hengxu Zhang Fang Shi Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan China

ISBN: (纸本)9781467371070

Electric vehicles (EVs) are new power loads of power systems. It is important to model the charging process of EVs in power system numerical simulation. This paper proposes a methodology for modeling of EV loads applicable to power flow calculation and other quasi-steady state analysis. The numerical methodology of EV load modeling is expounded from the DC and the AC side of charging EVs. In the DC side, the constant current and the constant voltage charging processes are considered. In the AC side, the changes of the charging efficiency and power factor versus the AC frequency and voltage are analyzed. Based on the current EV market status and the development trends, four types of EV load models are calculated using this methodology. The EV load modeling methodology considers EV quantities, initial state-of-charge distributions, load change processes during charging and the effect of grid side parameters.

关键词： Electric vehicles Decision support systems Batteries Power industry Battery chargers Load flow Numerical models

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Adaptive DFT algorithm for measuring synchrophasors based on shifting window symmetrical

Adaptive DFT algorithm for measuring synchrophasors based on...

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

作者： Shiming Liu Tao Guo Jianhui Li Jukun Wu Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

ISBN: (纸本)9781467371070

In order to improve the measurement accuracy of synchronized phasor in the case of frequency offset, an adaptive DFT algorithm based on shifting window symmetrical was presented. First of all, sampling window length of DFT is determined by tracking the frequency of the power grid. Secondly, the composed phasor is calculated by utilizing three sampling windows which were away from a quarter sampling window length to each other. After compensating the fixed offset, the precise phasor measurement results can be computed. In addition, in order to quickly and accurately track the frequency, a zero-crossing algorithm based on three-phase signal for measuring frequency was proposed. The simulation results show that the proposed algorithm can meet the accuracy of synchronized phasor measurement, significantly decreases the computational complexity over the conventional method, and satisfies the requirements of real time applications for the smart grid.

关键词： Frequency measurement Discrete Fourier transforms Power industry Power grids Simulation Synchronization

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Determination of the Main Unbalance Sources on PCC in the Distribution system

Determination of the Main Unbalance Sources on PCC in the Di...

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IEEE Power and Energy Society General Meeting

作者： Yuanyuan Sun Peixin Li Yixuan Wang Zhiming, Yin Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan China

ISBN: (纸本)9781467380416

This paper proposes a method to determine the main unbalance sources on the point of common coupling (PCC) in the distribution system. The unbalance sources in the upstream side are proposed to be equivalent as a Thevenin voltage source, while the unbalance sources in the downstream side are equivalent as an unbalanced current source. An unbalance contribution factor is proposed to determine the contribution of the upstream and downstream unbalance sources. Moreover, the upstream Thevenin equivalent circuit is estimated based on the measured PCC voltages and currents using the complex least-square method. Simulation results verify the validity and accuracy of the proposed method.

关键词： Point of common coupling negative sequence power quality unbalance contribution voltage unbalance negative sequence dispensing system voltage unbalance Unbalance Power quality point of common coupling PRIMARY COMPONENT COOLING 1-piperidinocyclohexanecarbonitrile Upstream Equivalent Caste determination Sex Determination Processes

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Detailed modeling and simulation of +500kV HVDC transmission system using PSCAD/EMTDC

Detailed modeling and simulation of +500kV HVDC transmission...

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IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)

作者： Pu Liu Renfei Che Yijing Xu Hong Zhang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

In this paper, an accurate HVDC transmission system model, which includes AC system, transformer, converter, AC/DC filter, smoothing reactor and transmission line, is built up by the power system simulation software PSCAD/EMTDC. Referring to the standard testing system CIGRE Benchmark, the simulation model of the control system is established, too. The simulation result shows that this model can simulate ±500kV HVDC system accurately and is capable of being used as an effective tool to study HVDC transmission system or other related researches.

关键词： HVDC transmission Power harmonic filters Inverters Passive filters Rectifiers Power transmission lines Benchmark testing

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Two-stage stochastic approach for spinning reserve allocation in dynamic economic dispatch

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Journal of Central South University 2014年第2期21卷 577-586页

作者：杨明张利韩学山程凤璐 Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University)

A novel approach was proposed to allocate spinning reserve for dynamic economic *** proposed approach set up a two-stage stochastic programming model to allocate *** model was solved using a decomposed algorithm based on Benders' *** model and the algorithm were applied to a simple 3-node system and an actual 445-node system for verification,*** results show that the model can save 84.5 US $ cost for the testing three-node system,and the algorithm can solve the model for 445-node system within 5 *** test results also illustrate that the proposed approach is efficient and suitable for large system calculation.

关键词： power system dynamic economic dispatch spinning reserve response risk two-stage stochastic programming Benders＇ decomposition

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Modeling and Optimization of Cooperative Interception and Guidance Allocation in Multi-Platform Air Defense

Modeling and Optimization of Cooperative Interception and Gu...

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第三十四届中国控制会议

作者： Jian Jia Zhihong Peng School of Automation Beijing Institute of Technology Key Laboratory of Complex System Intelligent Control and Decision Ministry of Education

ISBN: (纸本)9781467374439

In the multi-platform air defense combat, platforms cooperate to achieve best effect. In the traditional air defense cooperation, assigning interception units has been paid more attention. Based on the existing task allocation model, we added the cooperative guidance and time window constraints to accord with the modern battle mode. An allocation method based on decentralized auctions is also proposed. Each platform employs the heuristic method to choose proper target and confirm the execution time, then resolve the conflict by consensus rules. This method is robust for communication network, besides it can avoid the single point of failure. Simulation results show this algorithm is significantly effective and satisfies the demand of real time.

关键词： Weapon Target Assignment,Cooperative,Modeling,Time Window,Decentralized Auction

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Predictive control of wind power ramping based on wind turbine load optimization

Predictive control of wind power ramping based on wind turbi...

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International Conference on Renewable Power Generation (RPG 2015)

作者： Weipeng Liu Yang Cui Yutian Liu Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Jinan 250061 China

ISBN: (纸本)9781510821415

A predictive control strategy considering ramping rate and power deviation is proposed, which is based on wind turbine load optimization. The wind turbine load model is established according to blade element momentum (BEM) theory, and the influence factors of wind turbine load are analysed based on this model. The control strategy is divided into 3 modules. The prediction module is based on ultra-short-term neural network wind speed prediction. The online optimization model is established with the objectives of minimizing the ramping rate, wind turbine load and power deviation. The feedback module compensates the deviation of optimal control under practical operation conditions. Simulation results show that the proposed strategy can improve the security and economy of wind turbines when dealing with ramping events.

关键词： blade element momentum pitch control predictive control wind turbine load

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Fan fault diagnosis based on wavelet spectral analysis 34

Fan fault diagnosis based on wavelet spectral analysis

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34th Chinese control Conference, CCC 2015

作者： Zheng, Wen Pu, Wang Xuejin, Gao Yachao, Zhang College of Electronic and Control Engineering Beijing University of Technology Beijing China Engineering Research Center of Digital Community Ministry of Education Beijing China Beijing Laboratory for Urban Mass Transit Beijing China Beijing Key Laboratory of Computational Intelligence and Intelligent System Beijing China

ISBN: (纸本)9789881563897

Fan plays an irreplaceable role in the ventilation of underground environment. It will cause serious consequences once the fan fails. So it is essential to do fault diagnosis of fan to prevent the emergence of break down. Spectral analysis method is a simple and effective method for signal analysis and it has been widely used in fault diagnosis of rotating machinery. This paper has researched the bearing fault of fan on the base of in-depth study of the frequency characteristics of typical faults fan. High-frequency noise of vibration signal has been removed through wavelet soft thresholding method. Get its spectrum characteristic of the reconstructed signal, and then the failure category of signal is discriminated by comparing its characteristic frequency to typical faults frequency in theory. Combining the advantage of LabVIEW and MATLAB, we implement the algorithm through two of them, accomplishing denoising and spectral analysis of vibration signals, completing fault diagnosis of fan. © 2015 Technical Committee on control Theory, Chinese Association of Automation.

关键词： Fan Fault Diagnosis Spectral Analysis Wavelet Denoising

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Corrigendum to “Surface stress-based biosensors” [Biosens. Bioelectron. 51 (2014) 124–135]

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Biosensors and Bioelectronics 2015年 73卷 265-266页

作者： Shengbo Sang Yuan Zhao Wendong Zhang Pengwei Li Jie Hu Gang Li MicroNano System Research Center Taiyuan University of Technology Taiyuan Shanxi 030024 People's Republic of China Key Lab of Advanced Transducers and Intelligent Control System of the Ministry of Education Taiyuan University of Technology Taiyuan Shanxi 030024 People's Republic of China

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