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IEEE General Meeting power& Energy Society

作者： Peng Guo Wenying Liu Wei Zheng Chen Liang Jingjing Zheng Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing P.R.China

ISBN: (纸本)9781479964161

Integration of large-scale wind power had become main mode of wind-power delivery in China, however, as the weakness of grid and diversity of VAR sources, operation voltage fluctuation of power systems integrated with large-scale wind power remains to be solved. Therefore, propose a multi-time scale reactive power coordinated control strategy regarding fast continuous and slow discrete VAR sources, design a two-level coordinated voltage control model based on property of various VAR sources. The primary control level deals with operation of discrete VAR sources such as shunt capacitor and reactor based on wind power forecast to mitigate long-term substantial voltage fluctuation of pilot buses at large time scale; while the secondary control level deals with operation of continuous VAR sources such as wind turbines, SVC and SVG to mitigate small frequent voltage fluctuation of pilot buses at short time scale. Voltage fluctuation of pilot buses is effectively mitigated by two-level coordinated control strategy. The calculation on the voltage of China's grid accommodating large-scale and centralized wind power validates that the proposed method can effectively solve the problem of voltage fluctuation of pilot buses.

关键词： Reactive power Voltage control Fluctuations Wind turbines Voltage fluctuations Wind farms Wind power generation

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The uncertainty and its influence of wind generated power on power system transient stability under different penetration

The uncertainty and its influence of wind generated power on...

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International Conference on power system Technology (powerCON)

作者： Dong Han Jin Ma Ancheng Xue Tao Lin Guoqiang Zhang Institute of Electrical Engineering Chinese Academy of Sciences Beijing China School of Electrical and Information Technology University of Sydney Australia Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education China Electric Power University Beijing China

Wind gust has the characteristics of sudden and brief increase in wind speed. Moreover, if the penetration of wind power is high, its inherent characteristics may impacts on power system stability. In order to analyze the impacts of wind gust and wind penetration on wind turbine generator further the system stability, three signals to stand for wind gust types are adopted in this paper, i.e. lope signal, 1-consine discrete signal and step signal. This paper analyzes quantitatively the uncertainties of wind generated power arising from wind speed using different wind models. Then, two-area four-machine system is modified in MATlab, where the double-fed induction wind generators are used to simulate different wind power penetration. It is shown that different types of wind models and variations wind speed have different impacts on the generated wind power of wind farm. Moreover, it can be inferred when the penetration of wind power is high, the generated wind power outputs affect power system stability largely.

关键词： Wind power generation Wind speed power system stability Wind farms Uncertainty Stability analysis Generators

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A statistical evaluation of power grid fault detection

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ICIC Express Letters, Part B: Applications 2012年第1期3卷 47-52页

作者： Zhang, Yagang Wang, Zengping Zhang, Jinfang Key Laboratory of Power System Protection Dynamic Security Monitoring Control under Ministry of Education North China Electric Power University No. 619 Yonghua North Ave Baoding 071003 China

Fault detection is a traditional problem in the researches of complex power system. Relay protection is the first line of guaranteeing the safety of large-scale electricity grid. In order to serve the backup protection, the real-time or near real-time fault detection algorithm is the focus of our researches. In this paper, based on the basic principle of hypothesis testing, the F testing fault detection has been studied carefully. We have put forward an F testing fault detection system, and have discussed the statistical evaluation of power grid fault detection in detail. Extensive simulations have confirmed that the F testing fault detection is accurate and reliable. © 2012 ISSN 2185-2766.

关键词： Fault detection

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A Survey on Problems in Smart Grid with Large Capacity Wind Farm Interconnected

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Energy Procedia 2012年 17卷 776-782页

作者： Yang Peihong Liu Wenying Wei Yili School of Information Engineering Inner Mongolia University of Science and Technology Baotou China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Under Ministry of Education North China Electric Power University Beijing China

The basic concepts and development of smart grid is described. The influence of large capacity wind farm interconnected on the smart grid is analyzed particularly, following contents are emphatically presented: model of wind farm, basic operation performance, output forecasting of wind farm, power flow in smart grid including wind farm, balance of voltage and raeactive power, small disturbance stability, transient stability, faults and reliability, etc., in the hope of offering references for the fast development of smart grids absorbing more capacity of wind power.

关键词： smart grid power system wind farm stability

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Adaptive Loss of Field protection Based on Phasor Measurements

Adaptive Loss of Field Protection Based on Phasor Measuremen...

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IEEE power and Energy Society General Meeting

作者： Tianshu Bi Jiayin Sui Hao Yu Qixun Yang Key Lab of Power System Protection and Dynamic Monitoring & Control under Ministry of Education North China Electric Power University

ISBN: (纸本)9781457710001

Loss of field protection is of great importance for the security of large-scale generators. With the development of large-scale generators and corresponding loss of field protection, the complicated structure leads to the high possibility of loss of field faults. According to the statistical data, more than sixty percentages of the synchronous generator faults are the excitation system faults, which might cause loss of load, tie-line tripping, instability, collapse and etc. Therefore, it is crucial to identify loss of field as early as possible and take countermeasures. In loss of field protection, the impedance boundary criterion of steady state stability limit is widely used to distinguish loss of field and normal condition. However, the steady state stability limit circle is affected by the system operating modes, which might result in mis-operation of the relay. In this paper, an approach for on-line identifying system equivalent impedance is presented based on PMU measurements. The steady state stability limit circle can be adaptively fit for operating modes. The computer simulation results demonstrate that the proposed method works well.

关键词： Generator Loss of field protection Parameter identification Steady state stability limit dynamos Parameter identification Generator phasor measurement

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Fault detection under strong white Gaussian noise background in power systems

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ICIC Express Letters 2011年第4 B期5卷 1473-1479页

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

Principal components analysis uses a mathematical procedure that transforms a set of correlated response variables into a new set of uncorrelated variables. The few principal components contain almost all of the information that is available in the original variables. In most of the works on communications, the transmitted data is assumed to be corrupted by Gaussian noise. In our researches, under strong white Gaussian noise background, we used mainly principal components analysis theory to resolve fault detection problem in power systems. And the simulation results are entirely identical to the actual real situation. Therefore, the detection of fault can be resolved exactly and effectively by principal component analysis. ICIC International © 2011.

关键词： Principal component analysis

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Principal Components Fault Location Based on WAMS/PMU Measure system

Principal Components Fault Location Based on WAMS/PMU Measur...

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IEEE power and Energy Society General Meeting

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

ISBN: (纸本)9781457710001

In this paper, a novel fault location method based on Principal Component Analysis (PCA) is proposed, in which synchronized information data are utilized provided by the WAMS/PMU measurement system. PCA method is an efficient mathematic tool to reduce dimensions. Therefore, the state matrix, consisting of raw synchrophasor information versus multi-points and various times, is compressed effectively. By the remained key features, the corresponding principal component scores could be obtained. The simulation results have shown that, according to these scores, the fault component can be confirmed exactly. A great number of simulation trials have fully proved that the results of principal component analysis are accurate and reliable.

关键词： Principal component analysis Fault Location WAMS PMU Principal component score Fault location principal components analysis Wide area measurement systems Phasor measurement units fault component Simulation results

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A New Approach for Finding Connected Routes of power Network and Its Application

A New Approach for Finding Connected Routes of Power Network...

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IEEE power and Energy Society General Meeting

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

ISBN: (纸本)9781457710001

After taking the element of adjacent matrix as the function of the state of edges in the network structure, the representation of the element in corresponding adjoint matrix has been given an in-depth analysis. With the use of simplifying method on each element in adjoint matrix, the complete connected matrix could be formed equally with the each element as the set of connected routes. Based on the above analysis and processing, the new connected routes finding algorithm is established, which is a systematic method and suitable for all kinds of network connections. Finally, the successful application to substation configuration has validated the efficiency of the novel algorithm in power system topology analysis, in which the connected routes can be formed in off-line way and be used for topology analysis in on-line way. Therefore, the aim to reduce topology analysis time could be achieved.

关键词： Adjacent matrix Adjoint matrix Connected routes Topology analysis Adjoint matrix topological analysis power grids Elements

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control design and operational characteristics comparation for VSC-HVDC supplying active/passive networks

Control design and operational characteristics comparation f...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Jianzhong Xu Chengyong Zhao Baoshun Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

The transient mathematical models of two VSC-HVDC systems which are supplying active and passive networks respectively are developed in d-q synchronous reference frames. All the controllers were designed and realized current decoupled controls by applying PI (Proportional-Integral) regulators. A 2-Level VSC-HVDC supplying active network with fixed DC voltage control in rectifier side and fixed active power control in inverter side was modeled, then a 3-Level VSC-HVDC supplying passive network with fixed DC voltage control in rectifier side and fixed AC voltage control in inverter side was modeled thereafter, then their operational characteristics were tested and compared by simulations in PSCAD/EMTDC, which verified the effectiveness and stability of the designed controllers and validated great potentiality in future VSC-HVDC projects.

关键词： power conversion Inverters Voltage control Rectifiers Mathematical model Harmonic analysis

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Establish of Accuracy Assessment Indexes of power system Real-Time Digital Simulation

Establish of Accuracy Assessment Indexes of Power System Rea...

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

作者： Xiangxu Wang Chunlin Guo Xiangning Xiao Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Monitoring and Control under Ministry of Education University North China Electric Power University Beijing China

Real-time digital simulation has been widely used in power system analysis, which is becoming a very important tool to system planning, feasibility studies, and new equipment design, and the accuracy of real-time digital simulation has great effects on the security and economic efficiency of power system operation. In this paper, residual similarity is calculated by average percentage error, and shape similarity is calculated by coefficient method. Accuracy assessment method of real-time digital power system simulation is proposed concerning the two similarity indexes from the static and dynamic perspective. During the assessment of similarity of two curves, both the residual error between the two curves and the similar extent of variation trend of the curves are considered, and the assessment result is helpful to model modification. Analysis based on measurement data of test occurring in a certain ultra HVDC transmission power system of China and the simulation results on RTDS is presented, which proves the validity of this method.

关键词： Accuracy power system dynamics Shape Mathematical model Real time systems Analytical models

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