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

共 607 条记录，以下是41-50 订阅

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Study of TCPS-PWM based high-voltage cascade multilevel H-bridge active power filter

Study of TCPS-PWM based high-voltage cascade multilevel H-br...

引用

2006 China International Conference on Electricity Distribution, CICED 2006

作者： Zhou, Guoliang Shi, Xinchun Guo, Xiuhong Fu, Chao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 China

ISBN: (纸本)0863416381

A novel control strategy for 11-level cascade H-bridge APF based on TCPS-PWM is proposed in this paper. When the cascade inverter is applied to active power filter for distribution system, it is expected that the switching frequency and the EMI will be dramatically reduced below that of the traditional one. By the strategy, each power unit operates with relatively low frequency. At the same time, the equivalent switching frequency is still high so as to meet the high tracing ability for better compensation performance. This paper also focuses on the transposing modulation method to solve the problem of the balance of each DC voltage. PSIM is adopted for simulation of 11-level cascade H-bridge high-voltage active power filter which is to compensate the 10kV distribution system. Analytical and simulated results show the feasibility and superiority of the proposed strategy.

关键词： Pulse width modulation

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Validation of measurement-based load modeling for large-scale power grid

Validation of measurement-based load modeling for large-scal...

引用

IEEE power and Energy Society 2008 General Meeting: Conversion and Delivery of Electrical Energy in the 21st Century, PES

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

ISBN: (纸本)9781424419067

For a large-scale power grid, how to obtain load model for the substation without load characteristics recorder is the problem facing measurement-based load modeling. The feasibility that the measurement-based load model of a substation is applied to every substation was studied in this paper. The simulation results indicate that it is not feasible. Consequently, two methods were adopted to solve the problem. One method is that all substations were classified into several groups and then the measurement-based load model of a substation in every group was applied to the substations of its group. The other method is to get the base vectors of load model parameters and then obtain the load model parameters of all substations based on aggregation theory. The above two methods are validated in the practice of Northeast China power Grid load modeling. This has important significance for generalizing measurement-based load modeling to large-scale power grid. © 2008 IEEE.

关键词： Electric power transmission networks

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A new 10kV dynamic reactive power compensation and harmonics suppression equipment

A new 10kV dynamic reactive power compensation and harmonics...

引用

2006 China International Conference on Electricity Distribution, CICED 2006

作者： Yin, Zhongdong Xiao, Xiangning Zhang, Jianhua Shu, Qing Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Beijing 102206 China

ISBN: (纸本)0863416381

In this paper, an integrating schme to suppress the harmonics and compensate the reactive power based on the topology of thyristor controlled reactors (TCR) is presented. A new 10kV/500kvar dynamic reactive power compensation and harmonics suppression prototype made by placing a series of individual low voltage TCR reactive power modules in parallel and connecting them to the system through a multi-coil transformer has been developed. Experimental results have proven that the new euipment not only has all the advantages of the TCR but also very low level harmonics, which eliminates the need for suppression euipments. Furthermore, the cost is decreased and the reliability of the system is increased by avoiding euipments connected in series. A low voltage modular structure is adopted to increase the system capacitance and ease in augmenting the design. This equipment can solve the problems of large scale of load fluctuation and the serious excess of harmonic level.

关键词： Reactive 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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A new substation configuration algorithm based on the graphic characteristic of the main electrical connection

A new substation configuration algorithm based on the graphi...

引用

2010 5th International Conference on Critical Infrastructure, CRIS 2010

作者： Zhang, Jinfang Wang, Zengping Zhang, Yagang 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)9781424480814

In order to overcome some disadvantages of the conventional adjacent matrix method, the relationship between the elements of the adjacent matrix and the connected routes among nodes is analyzed as the fundamental introduction. Subsequently, the graphic characteristic of the main electrical connection in power plant or substation is extracted as three types: single branch, two branches in-parallel and multibranches in-parallel, and an unified principle for the formulation of connected routes among arbitrary two nodes in wiring connection is also proposed as the cornerstone for the novel method. Thirdly, a novel method of substation configuration is established based on the set of connected routes among arbitrary two nodes, and by mean of taking the route state as variables, the value of connected routes set is used to directly determine the element in corresponding place of the adjacent matrix. Finally, the example results show that the new method is able to finish the original topology analysis and track the state status of switches more accurately and rapidly. © 2010 IEEE.

关键词： Electric connectors

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Recent progress and future perspective on condition monitoring and diagnostic techniques for power equipments in China

Recent progress and future perspective on condition monitori...

引用

2008 International Conference on Condition monitoring and Diagnosis, CMD 2008

作者： Li, Chengrong Tang, Zhiguo Zheng, Zhong Beijing Key Laboratory of High Voltage Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

ISBN: (纸本)9781424416219

Under the general backgrounds of fast development of economy, China' power industry is undergoing a new upsurge of infrastructure construction. With the urgent need of the whole society for reliable power supply, Condition Based Maintenance strategy is becoming the mainstream of the operation and management of the power system. In this paper, recent progress of Condition monitoring and Diagnostic technologies for major power apparatus are reviewed. Also, some statistical data on practical on-line monitoring applications in China are introduced. At last, the key problems and trends of CMD are discussed with a viewpoint future perspective. ©2007 IEEE.

关键词： Condition based maintenance

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ATC determination for the AC/DC transmission systems using modified CPF method

ATC determination for the AC/DC transmission systems using m...

引用

2010 5th International Conference on Critical Infrastructure, CRIS 2010

作者： Chen, Zhongjie Zhou, Ming Li, Gengyin 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

With the expansion of the power systems, DC power transmission has been increasingly applied in interconnection of grids. The determination of Available Transfer Capability (ATC) for the AC/DC transmission systems is significant to the system planning and operation. So far, most studies have been focused on ATC determination for AC transmission systems, few are on the AC/DC system ATC determination. In this paper, the ATC determination model for the AC/DC systems is proposed. Multi-terminal DC (MTDC) system is considered in ATC computation model. Conventionally, the power injection variations are determined by load variations and generation dispatch, both of them are nonlinear. To model these nonlinear variations, an alternate iterative continuation power flow (CPF) method with multiple load variations and generation economic dispatch patterns is presented to solve the proposed model. The MTDC system configurations, the converter control strategies and the transformer's tap adjustment strategies are incorporated to this modified CPF algorithm. The modified IEEE 30-bus test system is used to verify the presented approach. © 2010 IEEE.

关键词： Electric load dispatching

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Hybrid non-linear state estimation with voltage phasor measurements

Hybrid non-linear state estimation with voltage phasor measu...

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2007 IEEE power Engineering Society General Meeting, PES

作者： Qin, Xiaohui Bi, Tianshu Yang, Qixun 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

In this paper, a new method of hybrid non-linear state estimation with PMU is proposed. Firstly, the voltage phasor measurements are transformed into indirect equivalent branch current measurements, with which the conventional state estimator takes the impact of PMU into consideration. Secondly, the indirect measurement errors caused by the measurement transforming are analyzed and calculated in detail. Thirdly, the accuracy of hybrid estimator is analyzed in the paper. The simulation results show that the proposed method improves the accuracy of estimator and the convergence speed also. © 2007 IEEE.

关键词： State estimation

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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...

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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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