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

共 605 条记录，以下是61-70 订阅

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Damping low-frequency oscillation in AC/DC power systems based on multi-operation modes

Damping low-frequency oscillation in AC/DC power systems bas...

引用

2006 International Conference on power system Technology, powerCON2006

作者： Yanfeng, Ma Zhao, Shuqiang Gu, Xueping Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Baoding 071003 Hebei China

ISBN: (纸本)1424401119

PSS and DC modulation (DCM) controllers are effective in suppressing low frequency oscillations of AC/DC mixed power systems, but controllers designed by conventional method for a certain oscillation pattern of a given operation mode maybe have a negative effect on other patterns, moreover, when the operate mode is changed, the damping effect becomes bad, so the coordination of parameters which are fit for multi-operation modes is a pivotal problem. Locations of controllers are determined by participation matrix, and parameters are coordinated by improved GA combined with sensitivity matrix and features of AC/DC mixed power systems. The example shows that parameters of controllers chosen by participation matrix and improved GA can have a good effect on damping low-frequency oscillations and have strong applicability. © 2006 IEEE.

关键词： Electric power systems

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Prony analysis of electrical transient characteristics of AC system during HVDC commutation failure

Prony analysis of electrical transient characteristics of AC...

引用

2010 9th International power and Energy Conference, IPEC 2010

作者： Zhang, Rulian Zhao, Chengyong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding Hebei Province China

ISBN: (纸本)9781424473991

With the development of High Voltage Direct Current (HVDC) transmission, the impact of DC system on AC relay protection becomes more prominent. So it becomes more important to research electrical characteristics of AC system under DC faults. In PSCAD/EMTDC environment, the inverter commutation failure resulted from short circuit faults in AC line is simulated based on the electromagnetic transient model of Shandong grid containing Ningdong-Shandong DC transmission system. Prony algorithm is applied to analyze the electrical transient characteristics of AC system during commutation failure. The coincidence of fitted waveform and simulated waveform verified the validity of prony algorithm. Prony analysis results show that DC system injects a large number of inter-harmonic components into the inverter side AC system during commutation failure, and the distortion of the parallel line current is more serious than that of the fault line current, so the impact of DC system on the AC relay protection devices equipped on the parallel line is greater. ©2010 IEEE.

关键词： Relay protection

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Novel modeling and control of doubly-fed variable-speed constant-frequency wind power generator

Novel modeling and control of doubly-fed variable-speed cons...

引用

33rd Annual Conference of the IEEE Industrial Electronics Society, IECON

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

ISBN: (纸本)1424407834

Reasonable modeling and control is of significance for theory study and practical operation of doubly-fed variable speed constant frequency (DFVSCF) wind power generator. Two sorts of simulation models called no-load model and generation model were obtained through linearization and discretization of the state equations of doubly-fed induction generator (DFIG), which was derived from the DFIG model in synchronously rotating reference frame. Both models work in coordination one after another to achieve the whole simulation of DFIG before and after grid-connection. Based on the field-oriented vector control technique, the decoupling control of output power of DFIG, together with grid synchronization, was investigated. The maximum power point tracking (MPPT) was realized by control of DFIG active power. The simulation results, which are highly consistent with the experiment results, verify the validity and correctness of the theoretical analysis and control strategy proposed by this paper. ©2007 IEEE.

关键词： Equations of state

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Research on interconnecting offshore wind farms based on multi-terminal VSC-HVDC

Research on interconnecting offshore wind farms based on mul...

引用

2010 International Conference on power system Technology: Technological Innovations Making power Grid Smarter, powerCON2010

作者： Wang, Song Li, Gengyin Zhou, Ming Zhang, Zhe 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)9781424459407

The paper describes the use of multi-terminal HVDC transmission system based on voltage source converter (VSC) (VSC-MTDC) for connecting doubly fed induction generator (DFIG) based wind farms over long distance. The operation principles between DFIG and VSC-MTDC of the proposed system are described. Stator flux oriented vector control technology is used to execute AC excitation for DFIG rotor, then independent control of active and reactive power is realized and electricity generation by capturing maximal wind energy is also obtained. The control objective of rectifiers is delivering the generated power from the wind farms to the DC network instantaneously and to keep AC voltage at wind farm bus constant. The control objective of inverters is receiving the power from the DC network and to keep DC voltage constant, and the multi VSCs are controlled coordinately, the relevant mathematical model was established. The parameters optimization based on simplex algorithm and objective function are used to get suitable PI control parameters of VSC-MTDC. Interactions between DFIG and VSC-MTDC link are investigated and simulations performed in PSCAD/EMTDC to verity the proposed control strategy. ©2010 IEEE.

关键词： Electric utilities

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A combined prediction method of wind farm power

A combined prediction method of wind farm power

引用

2010 5th International Conference on Critical Infrastructure, CRIS 2010

作者： Ye, Chen 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)9781424480814

Wind power forecasting has great significance to the connection of wind farms to the electric power system. This paper analyzes individual forecast models, such as the time series forecasting, Elman network forecasting that based on the chaos theory, grey neural network forecasting, and generalized regression neural network forecasting, etc., then puts forward an entropy weight combination prediction model, and an optimal combination forecasting model for the wind power forecasting that based on vector angle cosine. The forecasting results indicate that due to the different forecast precisions of different methods, the methods with high precisions may bring great variation in some points, and the combination forecast can reduce the forecasting variation in several points, which improve the forecasting precision. © 2010 IEEE.

关键词： Entropy

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Information entropy based fuzzy optimization model of electricity purchasing portfolio

Information entropy based fuzzy optimization model of electr...

引用

2009 IEEE power and Energy Society General Meeting, PES '09

作者： Yanan, Zheng Ming, Zhou Gengyin, Li 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)9781424442416

With the development of electricity demand side market, large consumers have more electricity purchase choices, in the same time have to face the risk of electricity price fluctuation on different markets. In order to measure and hedge the risk reasonably, this paper introduces information entropy as the measure to risk in electricity purchase, by aid of fuzzy optimization, linear membership function is adopted and the optimal electricity purchasing portfolio model is established according to the given expected target and tolerance. Test results show that information entropy can overcome lots of shortages in the method that adopts variance as risk measure;the electricity purchase strategy given by fuzzy optimization has good consideration both on price and risk. ©2009 IEEE.

关键词： Sales

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Design of PV array model based on EMTDC/PSCAD

Design of PV array model based on EMTDC/PSCAD

引用

2009 Asia-Pacific power and Energy Engineering Conference, APPEEC 2009

作者： Xue, Jinhui Yin, Zhongdong Wu, Bingbing Peng, Jun Key Laboratory of Power System Protection and Dynamic Security Monitoring Control under Ministry of Education North China Electric Power University Beijing 102206 China

ISBN: (纸本)9781424424870

Along with consuming of fossil energy step by step, crisis of energy has been appeared. The solar energy, which is endless, is a kind of renewable energy. Radiation of sun coming to earth in a day is equal to the energy, which is released by trillion buckets of oil. The research of solar energy generation has stepped into a very activity period. This paper analyses the physics characteristic of photovoltaic array firstly, then researches the mathematical model applying in engineering, and designs the total simulation model based on power electronic circuit in the end. In order to validate the correctness and validity, this paper makes a simulation as an example. The scheme can express the V-I characteristic of photovoltaic array very well. © 2009 IEEE.

关键词： Solar energy

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Fault diagnosis based on cluster analysis theory in wide area backup protection system

Fault diagnosis based on cluster analysis theory in wide are...

引用

2009 Asia-Pacific power and Energy Engineering Conference, APPEEC 2009

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

ISBN: (纸本)9781424424870

In wide area backup protection of electric power systems, the prerequisite of protection device's accurate, fast and reliable performance is its corresponding fault type and fault location can be discriminated quickly and defined exactly. In our researches, global information has been introduced into the backup protection system. By analyzing and computing real-time PMU measurements, basing on cluster analysis theory, we are using mainly hierarchical cluster analysis technology to seek after for the statistical laws of electrical quantities' marked changes. Then we carry out fast and exact identification of faulty components and faulty sections, and finally accomplish fault isolation. Multivariate statistical analysis theory is an efficient theory that can resolve different kinds of complex problems. It has been applied successfully in many researches of various fields, such as geology, weather, hydrology, iatrology, industry, agriculture, and economy, etc. In the study of electric power systems, multivariate statistical analysis theory must also have a good prospect of application. © 2009 IEEE.

关键词： Cluster analysis

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Technology research of novel energy storage control for the PV generation system

Technology research of novel energy storage control for the ...

引用

2009 Asia-Pacific power and Energy Engineering Conference, APPEEC 2009

作者： Xue, Jinhui Yin, Zhongdong Wu, Bingbing Wu, Ziping Li, Jun Key Laboratory of Power System Protection Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing 102206 China

ISBN: (纸本)9781424424870

Recent years, technologies for new energy have developed rapidly since the energy crisis and the environmental pollution got worse. And the solar energy generation technology tends towards the stage of a large number of applications in engineering from the research stage. This paper designed a grid-connected PV system firstly, then introduced the operation principle of the various parts as well with the control strategy of the power flow. The design of energy storage is of great significance as the output power of PV cells array is greatly affected by the light intensity and the temperature change. Battery is used as the energy storage device normally in the traditional energy storage system. In this paper, it used the Ultracapacitor as the energy storage device after comparing with the battery, and designed the charge-discharge control strategy according to the characteristics of the Ultracapacitor. Finally it verified the feasibility of the energy storage control strategy through the simulation models which was built based on the PSCAD/EMTDC platform. © 2009 IEEE.

关键词： Supercapacitor

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Overvoltage analysis of long AC transmission line connected with VSC in power system restoration

Overvoltage analysis of long AC transmission line connected ...

引用

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

作者： Li, Guangkai Li, Gengyin Liang, Haifeng Zhao, Chengyong Yin, Ming 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)0863412467

Overvoltage in power system restoration must be verified. The basic principle of VSC-HVDC (voltage source converter based high voltage direct current transmission) is briefly introduced. VSC-HVDC has such characteristics as flexible operation and control modes, independent control of active and reactive power, and operation on four quadrants. The overvoltage of the overvoltage between AC transmission line and the line connected with VSC-HVDC are calculated by theory analysis and simulation on PSCAD/EMTDC. The comparison of those overvoltage shows that the overvoltage of long AC transmission line connected with VSC-HVDC is lower than that of pure AC transmission lines. So the application of VSC-HVDC can enhance the speed of power grid restoration.

关键词： Restoration

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