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

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The structure and application of flexible SCADA

The structure and application of flexible SCADA

引用

2006 IEEE power Engineering Society General Meeting, PES

作者： Haijing, Yang Yihan, Yang Dongying, Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Department of Electrical Engineering North China Electric Power University Zhuxinzhuang Dewai Beijing 102206 China

ISBN: (纸本)1424404932

This paper put forward to an interactive flexible SCADA system in which information shared, on the basis of analyzing and summarizing the defections of former SCADA. It not only solves the interaction of data and function in the information islands, but also solves functions coordination and data exchange of distributed application system in different location. The paper proposes the concept of general data acquisition, discusses the structure and the ways of technology support, and describes the application of flexible SCADA based on the example of fault decision support system (FDSS). This proposal flexible SCADA extends and develops the data source of traditional SCADA and enriches the data foundation for power system advanced analysis software. ©2006 IEEE.

关键词： SCADA systems

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An intelligent distribution network planning based on GIS

An intelligent distribution network planning based on GIS

引用

2006 China International Conference on Electricity Distribution, CICED 2006

作者： Liu, Jun Yu, Han Zhang, Jianhua Yuan, Qihong Qian, Qi Shang, Jingfu Li, Sheng Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing 102206 China Department: Electric Power Engineering North China Electric Power University 102206 China

ISBN: (纸本)0863416381

Distribution network planning is a multi-goal and multi-restricted problem that involves the geographical condition of power line route, constructing and maintenance expenses, power line losses, power flow and security constraint. Computer aided planning is an important studying direction now. However, automatic line routing can not be made now. A model is advanced in this paper to minimize the work of planner and to simplify the network planning procedure. In this paper, an improved particle swarm optimization (PSO) is used to escape the locally point by adopting the probability distribution feature and controlling the flying speed automatically. By using this method in Jinan power network, found that the speed of network-planning can be improved by adopting the improved PSO and geographical feature pretreatment.

关键词： Geographic information systems

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Analysis of ionized field under ±800kV HVDC transmission lines

Analysis of ionized field under ±800kV HVDC transmission li...

引用

17th International Zurich Symposium on Electromagnetic Compatibility, 2006

作者： Tiebing, Lu Jie, Zhao Xiang, Cui Han, Feng Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei China Technology Research Center of China Southern Power Grid Guangzhou 510620 Guangdong China

ISBN: (纸本)3952299049

HVDC transmission lines system has some advantages, but it can generate an effect on the environment nearby due to the corona, especially the ionized field. Based on the electromagnetic field theory, a simple method to analyze the ionized field generated from the bundled conductors of bipolar lines is proposed. And then, after the validity of the method is testified, some examples are analyzed and some conclusions are drawn finally. The results have been used in the design of ±800kV HVDC transmission lines system in China.

关键词： Electric lines

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A wide area measurements based global control scheme for improving transient stability

A wide area measurements based global control scheme for imp...

引用

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

作者： Zhang, X.Y. Huang, S.F. Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Beijing 102206 China Si Fang Research Institute North China Electric Power University Beijing 102206 China

ISBN: (纸本)0863412467

In this paper, a global control scheme for improving transient stability of power systems by thyristor controlled braking resistor is proposed. According to the hierarchical control theory of large-scale system principle, the control structure is organized into a two-layer controller. Two-level co- state prediction algorithm is used during optimization of parameters of the controller. The lower layer is composed of decentralized local feedback controllers, each of which takes local feedback signal and controls its connected generator. In the upper layer a global controller is designed to enhance the effectiveness of decentralized local controllers. The global controller coordinates local controllers by generating remote feedback signals which ensuring the global optimal solution of the overall system transient performance. The proposed control scheme can guarantee fast and accurate control actions of local controllers when a power system is subjected to large disturbances. Simulation results show the effectiveness of the proposed control scheme.

关键词： controllers

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Study on the control of DFIG and its responses to grid disturbances

Study on the control of DFIG and its responses to grid distu...

引用

2006 IEEE power Engineering Society General Meeting, PES

作者： Ming, Yin Gengyin, Li Ming, Zhou Guoping, Liu Chengyong, Zhao IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China Shijiazhuang Electricity Company Shijiazhuang 050051 Hebei Province China

ISBN: (纸本)1424404932

The paper presents the dynamic model of doubly fed induction generator (DFIG) including the mechanical model, the generator model and the PWM voltage source converter model. The mechanical model uses two-mass model, and the generator model includes both the stator side and the rotor side dynamics. The PWM voltage source converter is modeled as an average model in which the action of power electronic switches is neglected. The paper features vector control of DFIG. On the rotor side converter, the control scheme enables the independent control of speed and reactive power from the stator. On the grid side converter, the control scheme is implemented to regulate the DC voltage and reactive power from the grid as well. In order to study the influence of the grid disturbances on the DFIG, grid voltage dip and quick frequency change are simulated with the engineering software, MATLAB/Simulink. Meanwhile, in the paper the pole-placement method and internal model control method are implemented for designing the PI controllers. © 2006 IEEE.

关键词： Asynchronous generators

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User-defined HVDC reactive power control modeling for system stability studies in PSASP

User-defined HVDC reactive power control modeling for system...

引用

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

作者： Ding, Hui Han, Minxiao Xu, Decao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Changping District Beijing 102206 China School of Electrical Engineering North China Electric Power University Beijing 102206 China

ISBN: (纸本)0863412467

A detailed user-defined (UD) reactive power control (RPC) model of HVDC has been developed in power system Analysis Software Package (PSASP). The UD RPC model, as one part of UD HVDC models which have been set up based on the control system of Three Gorges-Changzhou project, includes reactive power generation calculation, reactive power consumption calculation, reactive power control strategies and converter reactive power regulator strategies. Each part of the UD RPC model and its guidelines are presented in this paper. Case studies are carried out on the WEPRI-7 system whose embedded HVDC models are replaced by the UD HVDC models. The simulation results show the correctness and necessity of the UD RPC model for AC/DC hybrid system interaction and stability analysis.

关键词： Reactive power

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Researches on the Load Representation of Hunan power Grid AC/DC system

Researches on the Load Representation of Hunan Power Grid AC...

引用

International Conference on power system Technology (powerCON)

作者： Z.y. Liu J. Wen M.x. Han L. Dong H. Ding Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

Both static and dynamic electric load characteristics have considerable effect on short circuit ratio (SCR) or effective short circuit ratio (ESCR). This paper gives emphasis on the relationship between static/dynamic load characteristics and SCR (ESCR). Different power level with different power factor is considered for the impacts on SCR or ESCR of static load characteristics. Three-phase short-circuit current of induction motors is qualitative analyzed and simulation of the feeding current is carried out for the dynamic process of induction motor in the consideration of dynamic load characteristics. Case studies are carried out on WEPRI-36 system and Hunan power grid. Simulation results with power system analysis software package (PSASP) illustrates that load should be considered in calculating SCR.

关键词： power grids power system dynamics Thyristors power system simulation Induction motors Analytical models Reactive power Circuit simulation power system analysis computing Software packages

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Study on Secondary Voltage control Based on Multi-agent Particle Swarm Optimization Algorithm

Study on Secondary Voltage Control Based on Multi-agent Part...

引用

International Conference on power system Technology (powerCON)

作者： Z. W. Jia J. Liu X. M. Xie Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

Secondary voltage control system is a significant segment of the hierarchical voltage control in power systems. Though voltage controller has both constant voltage regulators, such as generators and static reactive power compensators, and discrete voltage regulators, such as OLTC and shunt capacitors/reactors, traditional secondary voltage control (SVC) only consider constant voltage regulators. A few of the papers consider discrete voltage regulators, but they are also treated as constant variable. In this paper, Considering the trait of continuous and discrete devices in secondary voltage control co-existing, a mixed secondary voltage control optimal model including continuous and discrete variables is established. The solution is gained by multi-agent particle swarm optimization algorithm. This method concerned with the advantages of multi-agent system and particle swarm optimization algorithm can get every setting value of regulator exactly and quickly. The proposed method is applied to the New England 39 nodes system. It is shown that by contrast to the traditional secondary voltage control, this method can achieve satisfactory controlling effort involved both constant and discrete controllers at the same time.

关键词： Voltage control Particle swarm optimization Regulators power system control power systems power generation Reactive power control Shunt (electrical) Capacitors Inductors

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Wams Based Flow Transferring Indentification Algorithm and its implementation

Wams Based Flow Transferring Indentification Algorithm and i...

引用

International Conference on power system Technology (powerCON)

作者： H. M. Xu T. S. Bi S. F. Huang Q. X. Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

When relays trip a faulted line in power system, the flow on the faulted line will be transferred to the other lines. Those lines might be overloaded and then cascading tripped by the backup relays, which worsen the system state and even cause blackout. Generally, these kind of cascading trips are the origins of a lot of well-known blackouts. In this paper, by analyzing the defects of traditional backup protections, a new wide area backup protection scheme based on WAMS is presented to identify flow transferring. A new concept of flow transferring relativity factor (FTRF) is proposed to estimate the flow distribution after flow transferring occurs; and the method of calculating FTRF matrix online is also deduced. The simulation of 10-unit and 39-bus New England network shows that the proposed wide area backup protection scheme can identify flow transferring successfully and hence be superior to the traditional backup protection.

关键词： power system protection power system relaying power system faults power system security Protective relaying Wide area measurements Fault diagnosis power system reliability Bismuth power system measurements

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Operational Mechanism and Characteristic Analysis of Novel Hybrid HVDC system

Operational Mechanism and Characteristic Analysis of Novel H...

引用

International Conference on power system Technology (powerCON)

作者： Guangkai Li Gengyin Li Haifeng Liang Ming Yin Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

Conventional HVDC has the advantages of mature state of art and lower cost and the disadvantages of absorbing large reactive power and the danger of commutation fault. Voltage source converter (VSC) based HVDC (VSC-HVDC) has the advantages of flexible operation and control and the disadvantages of high cost. Combining the advantages of the two kinds of transmissions, a novel hybrid HVDC transmission type is analyzed in this paper, which the sending terminal adopts phase control converter (PCC) and the receiving terminal adopts VSC. The hybrid HVDC system can supply to passive network, supply reactive power to AC system and expediently extend to two bi-terminal or multi-terminal systems from conventional HVDC system. The expressions of voltage, current and power in rectifier and inverter sides are deduced. The relationship between the operational variables and control variables is analyzed. The basic regulation characteristics are gotten. The simulation model is founded based on the simulation software PSCAD/EMTDC. Simulation results show that the hybrid HVDC system could be operated steadily when the system active power changes slowly and quickly. It has the application prospect in scope of long distance small load supplying, multi-terminal DC system connection and system black-start etc.

关键词： HVDC transmission Converters power conversion Costs Reactive power Art Voltage control Phase control Passive networks power supplies

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