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

共 605 条记录，以下是41-50 订阅

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The research on distributed dynamic power flow based on asynchronous iteration mode considering frequency change

The research on distributed dynamic power flow based on asyn...

引用

International Conference on power system Technology (powerCON)

作者： Xin, Baojiang Zhang, Haibo Key Laboratory of Power System Protection and Dynamic Security Monitoring North China Electric Power University Beijing China

ISBN: (纸本)9781424459407

In modern power system, power systems are being interconnected into a unified system. The structure of the power grid is more and more complex, and the relation between different regional power grids is more closed. In order to achieve a joint power grid scheduling, incident handling and fault simulation, objectively, the control centers are required to use distributed algorithm. But the distributed Energy Management system (EMS) and Dispatcher Training Simulator (DTS) used now are not mature and the frequency changes are not considered in the distributed algorithms. This makes impossible to obtain an accurate simulation of the actual power system operation status in the distributed EMS/DTS. Because the dynamic flow algorithm can reflect the actual system more exactly, a new method called distributed dynamic power flow based on asynchronous iteration mode considering frequency change is proposed in this paper. The whole idea of the algorithm is given. The generator unit in dynamic power flow, considering frequency changes, can be modeled in coordinate layer and used to calculate frequency changes and the power sent to the network. The network modeled in coordinate layer and subsystems, is used to calculate power flow and unbalance power of the interconnected system. By a dozen times iterative solution between generator unit and network unit, the unbalanced power are distributed in generator and load nodes finally. In this article, we take the IEEE 9 node system as an example to authenticate this method. The simulation results are the same as the real ones hence showing that the new algorithm is real and effective. ©2010 IEEE.

关键词： Energy management systems

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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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Available transfer capability assessment of AC/DC transmission system

Available transfer capability assessment of AC/DC transmissi...

引用

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

作者： Gao, Yajing Yang, Jin Zhou, Ming Li, Gengyin Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University 071003 Baoding China

ISBN: (纸本)9781424459407

With the increasing expansion of AC/DC transmission system scale, the research on Available Transfer Capability (ATC) for AC/DC transmission systems has important academic and practical significances to AC/DC transmission system planning, operation and reliability evaluation. Most of the existing ATC calculation methods are mainly based on deterministic techniques and suitable for AC transmission system. In practical power systems, there are large amount of uncertainties which can effect the operation of AC/DC transmission system, and power system is dynamic and time-varying. A novel approach is proposed to analyze relevant features of ATC and calculate ATC based on sequential Monte Carlo-Frequency and Duration (FD) considering uncertainties and time variation of AC/DC transmission systems. The algorithm MATLAB6.5 is developed. Modified IEEE-14 node test system is used to verity the presented approach. ©2010 IEEE.

关键词： Uncertainty analysis

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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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New algorithm of topology analysis based on PMU information 1

New algorithm of topology analysis based on PMU information ...

引用

2010 5th International Conference on Critical Infrastructure, CRIS 2010

作者： Qian, Cheng Wang, Zengping Zhang, Jinfang 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

With the widely installation of Phasor Measurement Units (PMUs) in power system and the increasing requirement of the real-time monitoring and control, a novel power system topology analysis algorithm is proposed with high precise information from PMUs to improve the performance of current network topology analysis. First of all, a method of identifying switch status is established to correct the state mistake of circuit breakers (CB) relying on the analog data acquired by PMUs. Subsequently, a topology analysis in substation combined with the PMUs information (including the digital data of CBs state and the phasor of voltage and current) is advanced in this paper. And then an efficient topology analysis algorithm introduces into topology search process using Cotree-to-Bus structure array. Finally, simulation results based on the PSCAD and MATLAB software have validated the efficiency and accuracy of the novel method introduced in this paper. © 2010 IEEE.

关键词： MATLAB

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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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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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Characteristic analysis of UHV secondary arc current under different power transmission

Characteristic analysis of UHV secondary arc current under d...

引用

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

作者： Zhou, Lixia Zhang, Huiyuan Wen, Jun Xiao, Xiangning Key Laboratory of Power System Protection and Dynamic Security Monitoring North China Electric Power University Beijing China

ISBN: (纸本)9781424424870

Along with the enhancement of voltage level, harmful affect of the secondary arc current to the system becomes more and more serious. The transmission power of the lines is one of factors that influence the secondary arc current obviously. The voltage distribution along the transmission line will changes according to the different transmission power, which will lead to the variation of the induction component from the sound phases when the fault occurs. In this paper, the quadric-mode transformation is adopted to establish the mathematic model of secondary arc current in the double-circuit transmission line. According to the variation of power transmission, the secondary arc current of different fault point is calculated. The results indicate that secondary arc current is influenced much by the line transmission power, and the variation trend changes along with the fault point. When the fault occurs in head or terminal of the line, the secondary arc current may becomes larger along with the increasing of the transmission power, thus effective suppress measurements must be taken. © 2009 IEEE.

关键词： power transmission

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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...

引用

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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