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

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Transient plane wave coupling to overhead line above a multi-layer soil

Transient plane wave coupling to overhead line above a multi...

引用

2006 IEEE International Symposium on Electromagnetic Compatibility, EMC 2006

作者： Qi, Lei Cui, Xiang Li, Lin IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding Hebei China

ISBN: (纸本)142440293X

Considering the displacement current in the multi-layer soil, the formulas of the ground return impedance and the Fresnel reflection coefficients are derived in frequency domain. These expressions are valid for discretional soil conductivities and the whole range of frequencies. For the convenience of transient analysis, the vector fitting method is adopted to expand the time-domain forms of the ground return impedance and the Fresnel reflection coefficients into the sum of finite exponential functions which are easy to be treated. Based on the recursive algorithm for the time-domain convolution, the finite difference time-domain (FDTD) method improved by the authors is used for the transient analysis of the external excited overhead line. Compared with the existing method applicable for homogeneous soil, the proposed method is demonstrated to be correct. © 2006 IEEE.

关键词： Overhead lines

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Wind power price regulation considering wind power fluctuation

Wind power price regulation considering wind power fluctuati...

引用

2010 5th International Conference on Critical Infrastructure, CRIS 2010

作者： Zhang, Yuhong Zhou, Ming Li, Gengyin Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Changping 102206 Beijing China

ISBN: (纸本)9781424480814

Wind power penetration to power systems is increasing rapidly in the recent years due to its environmental benefit, while wind power fluctuation also brings some problems to power system operation which impacts the transmission company's willingness to accept wind power. The most serious conflict influencing wind power development is that the currently adopted price of wind power on-grid does not take this fluctuation or the impact on the system operation into account. Currently, quotas and enforcing access is broadly used in wind power regulation. It is now required that all wind power output should be accepted by the grid, and is rewarded with a guided rate. But with the increase of wind power penetration to power grid, a more effective price regulation to wind power should be set up with wind output uncertainty into account. This paper takes wind farms in different areas in China as the research objects and uses accounting cost analysis approach to calculate wind power costs, which enables the wind farms in different areas to get the same rate of return on investment as that of thermal power plants. These tariffs will be derived as a basic price for the reference by the power grid then. The basic wind power prices are multiplied by a penalty factor which is an innovative as the final prices paid to the wind farms. The penalty factor is related to the accuracy of wind power output. If the accuracy of the wind farm output is higher than that of the regional average one, the penalty factor will be greater than one, so that the really paid wind power price is higher than the base value and the income of the wind farm will be increased, otherwise the earnings will be reduced. To illustrate the problem, an example is given. The use of this penalty factor will eventually help stimulate wind farms to improve the accuracy of wind power output, and improve the stable operation of the systems with large wind power penetration, and promote the sustainable development of wind

关键词： Cost benefit analysis

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Credibility theory applied for estimating operating reserve considering wind power uncertainty

Credibility theory applied for estimating operating reserve ...

引用

2011 IEEE PES Trondheim powerTech: The power of Technology for a Sustainable Society, powerTECH 2011

作者： Xue, Zhiying 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)9781424484195

The estimation of operating reserve to guarantee the system security and economic operation is an important task in power system operation. With the rapid increase of wind power installation and its large scale integration into power systems, the uncertainty of wind power should be considered in operating reserve estimation. This paper discusses the risk from wind power forecast error and introduces the idea of wind power at risk. The total risk due to wind power forecast error is studied from two different aspects, and two sets of indices are proposed. Credibility theory is applied to get the comprehensive index which is used to estimate operating reserve. Numerical tests are done to compare the proposed approach with others. The results show that the proposed approach can give more economic operating reserve estimation without loss of system security, which may be a reference for the power systems with large scale intermittent generation to estimate operating reserve. © 2011 IEEE.

关键词： Wind power

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Research and implementation of expanding the size of electromechanical transient in the hybrid real-time simulation

Research and implementation of expanding the size of electro...

引用

2010 5th International Conference on Critical Infrastructure, CRIS 2010

作者： An, Na Zhao, Chengyong 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

In this paper, concerning the limitations of this method which can not meet the current needs of the development of large-scale power system, a new electromechanical transient simulation model based on dynamic equivalent is proposed. It develop a new vision for the electromechanical transient and electromagnetic transient hybrid simulation, which presents the application of dynamic hybrid simulation equivalent in hybrid simulation. Two cases are studied, electromechanical Simulation of IEEE14 nodes system, and hybrid simulation of electromagnetic transient and electromechanical transient on RTDS was developed, in the condition that the electro-magnetic transient part is an actual DC system. The simulation results show that dynamic equivalence presented in the paper is valid and effective. On this basis, hybrid simulation based on dynamic equivalence is realized, thereby expanding the simulation size of AC system. © 2010 IEEE.

关键词： Electromagnetic simulation

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Multi-layer disturbance processing system based on multiple information sources

Multi-layer disturbance processing system based on multiple ...

引用

2007 IEEE power Engineering Society General Meeting, PES

作者： Bi, Tianshu Li, Qian IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing 102206 China

ISBN: (纸本)1424412986

More and more IEDs have been commissioned in power systems, such as digital relays, PMUs, metering and control devices, fault recorders and so on. Once there is a disturbance (for example, fault, low-frequency oscillation, etc.), large amount of information will pour into the control center. Therefore, how to identify the disturbance and then take corresponding countermeasures is crucial for power system security and reliability. A multi-layer disturbance processing system based on multiple information sources is proposed in this paper. Firstly, the characteristics of different kinds of information sources, including PMUs, RTUs, digital relays and fault recorders, are analyzed. Secondly, according to the arrival times of the information, the framework and functions of multi-layer fault diagnosis system is presented in detail. After a disturbance occurs, the suggested system could realize disturbance identification, fault element diagnosis and detailed post-fault analysis in succession at different time frames with the information coming, which fits the needs of operators well. © 2007 IEEE.

关键词： Information systems

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RTDS based maximal power point tracking simulation for permanent magnet synchronous generator

RTDS based maximal power point tracking simulation for perma...

引用

International Conference on Digital Manufacturing and Automation

作者： Chen, Jinmei Xue, Ancheng Bi, Tianshu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control School of Electrical Engineering North China Electric Power University Beijing 102206 China

ISBN: (纸本)9780769542867

In the control of the wind generation, the maximal power point tracking (MPPT) control plays important role in the efficiency. This paper presents the simulation results of the MPPT control with RTDS-based PMSG model. At first, it analyzes the vector-control scheme for the MTTP, which results in independent control of active and reactive power of the generator. And then, it develops the MPPT controller implemented on the rectifier and inverter based on PI control strategic. Furthermore, it builds the PMSG model based on the RTDS with the corresponding technology. And the simulation result with the proposed model verified the control strategy. © 2010 IEEE.

关键词： Wind power

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New mitigating measures against core saturation by series of additional grounding resistance from the point of view of network configuration

New mitigating measures against core saturation by series of...

引用

2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

作者： Ma, Yulong Xiao, Xiangning Jiang, Xu IEEE Key Laboratory ofPower System Protection and Dynamic Security Monitoring and Control Ministry of Education Beijing China

ISBN: (纸本)0780391144

High current of HVDC grounding electrode will induce a high potential in the nearby substation ground grid if the soil resistivity is high. Once there are potential differences among the ground grids, direct current will flow through the neutral grounded transformer. If the direct current through transformer winding is high enough core saturation will occur. The paper presented a method of series of additional resistance between the transformer neutral point and ground grid from the point of view of network configuration. A novel optimized algorithm is adopted in order to calculate the grounding resistance. Method presented in the paper is tested with China South Grid data. Results show that current through transformer neutral point can be reduced greatly and thus core saturation can be avoided. © 2005 IEEE.

关键词： Electric grounding

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Eigenvector selection in load classification and model generalization

Eigenvector selection in load classification and model gener...

引用

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

作者： Zheng, Xiao-Yu Jin, Ma. He, Ren-Mu IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University 102206 Beijing China

ISBN: (纸本)9787900714138

It has been well recognized that the load model has great effects on the power system analysis and control. However, it is also widely known that the load modeling is a quite difficult problem due to its special properties such as time-variant characteristics of the load. In this paper, the measurement-based load modeling approach and multi-curve identification technique are applied in Hushitai power station in Northeast China. In order to build practical load models that can describe the actual load characteristics without changing the model parameters too often, cluster analysis is used to classify the loads. Two main kinds of eigenvectors used in cluster analysis are also compared. Finally, based on the load classification, a new aggregation method is proposed to build load models with good generalization capability. Case studies show the efficiency of the proposed method. © 2008 DRPT.

关键词： Cluster analysis

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Parameters optimization of HVDC control system based on simplex algorithm in RTDS

Parameters optimization of HVDC control system based on simp...

引用

2010 5th International Conference on Critical Infrastructure, CRIS 2010

作者： Jia, Zhuo Zhao, Chengyong 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

The performance of HVDC system depends on the parameters of control system, and usually PI controllers have been used to adjust system to fulfill desired objectives. However, the optimization methods for PI controllers' parameters of HVDC system are very few up to now. And when the optimization task comes to RTDS, it becomes more complex. This paper introduces the Simplex Algorithm and its application in real time simulation (RTDS). The system objective functions are adopted to optimize the PI parameters of constant current (CC) control at the rectifier and the extinction-angle control at the inverter for Three Gorges-Shanghai ±500 kV DC Transmission Project on the basis of the control strategy. After the optimization process was finished, the performance of the PI controller with the optimized parameters was compared with that of the PI controller with the initial parameters. The step responses of those two PI controllers were presented by figures. And it shows that the controller with the optimized parameters has strong robustness. © 2010 IEEE.

关键词： HVDC power transmission

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power system dynamic simulation validation based on similarity theory and analytical hierarchy process

Power system dynamic simulation validation based on similari...

引用

2006 International Conference on power system Technology, powerCON2006

作者： Han, Dong He, Renmu Ma, Jin IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University 102206 Beijing China

ISBN: (纸本)1424401119

Simulation assessment of error and veracity is the precondition in power system dynamic simulation validation that is directly related to power system stability. Own to the applications of Wide Area Measurement system (WAMS) that could provide synchronous measured information of power grid, it is possible to assess dynamic simulation. Based on the principles of similarity theory and Analytical Hierarchy Process (AHP), this paper proposes general assessment method on amplitude similarity degree of simulation and its relative error criterion by analyzing the characteristics of power system dynamic stability and variables. This method could not only systematically reflect the similarity degree of whole system and every time period, but also provide objective quantitative information and reference for further model validation and parameter correction. A case study is presented to verify the proposed method on the basis of the measured data from WAMS of certain power grid. © 2006 IEEE.

关键词： Circuit simulation

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