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检索条件"机构=State Key Laboratory of Control and Simulation of Power System and Power"

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Optimal design of the back-to-back IGBT-based converter with the concept of systematic safe operating area

Optimal design of the back-to-back IGBT-based converter with...

引用

International Conference on Electrical Machines and systems (ICEMS)

作者： Gaoyu Zou Zhengming Zhao Liqiang Yuan Xuesong Wang Ting Lu State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China

The key parameters of SOA (safe operating area) of semiconductor devices are hard to be measured when converter is operating, which is not helpful to protect converter at any time. On the other hand, surplus estimating method is widely used to design the main circuit. In order to guarantee the whole system works safely and improve utilization rate of devices, the concept of SSOA (systematic safe operating area) is presented. By determining the relationship of key parameters between devices and converter, the expression of SSOA is described quantitatively. Then it is implemented as a basic rule to design a back-to-back converter based on IGBT for 55kW induction motor optimally. Rated value of DC-link voltage and grid filter of the system is obtained reasonably as well.

关键词： Inductance Insulated gate bipolar transistors Rectifiers power harmonic filters Semiconductor optical amplifiers Induction motors

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Cooperative Grid Modeling for Interconnected Multilevel Multi-area power systems

Cooperative Grid Modeling for Interconnected Multilevel Mult...

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2011 4th International Conference on Electric Utility Deregulation and Restructuring and power Technologies(第四届电力设施管制、重建及能源技术国际会议 DRPT 2011)

作者： ZHANG Jia-an ZHANG Na Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin 300072China

With the formation of large-scale interconnected power systems,the grid structure and operation mode are becoming increasingly ***,the power network model is maintained by distribution centers respectively according to the scope of *** power system analysis,the model data of the whole network is necessary,while only the internal data is transparent to a distribution center and the external data is not accessible ***,the model data from distribution centers must be integrated in a high-level distribution *** a traditional approach cannot meet the efficiency requirements for large power grid *** paper presents a method of network data modeling and maintenance for multi-level multi-area power systems,in which the local model data are maintained in each distribution center,the connection model is maintained in a higher level of distribution center,and all centers work *** a distribution center,the graphic modeling tools should be supported and the local model data can be maintained manually or exported from the *** the method,some technologies are considered,such as model data interfacing,version management,model data maintenance,*** modeling is helpful to improve the analysis efficiency and to reduce the burden of model data maintenance for large power grids.

关键词： power system:cooperative modeling :operation mode:model data interfacing:model data integration:version management:model data maintanence

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A parallel based real-time electromagnetic transient simulator for IPS

A parallel based real-time electromagnetic transient simulat...

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IEEE Electric Ship Technologies Symposium, ESTS

作者： Yuan Gong Laijun Chen Ying Chen Yin Xu State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing China

IPS has many special characteristics, such as using multi-phase, multi-frequency and hybrid AC/DC devices. As a result, existing electromagnetic transient simulators developed for power systems on land do not apply to IPS. This paper aims to build up a parallel based real-time electromagnetic transient simulator for IPS. A fast multi-switching process method for parallel electromagnetic transient simulations is coined to handle the tremendous switch events in IPS. To solve the difficulties brought by multi-phase machines in IPS, a multilevel hybrid parallel algorithm is forged through the combination of component level and network level parallelization. Based on the key techniques mentioned above, a parallel simulator is built up. Through sufficient testing to typical examples of IPS, the accuracy and high-efficiency of the simulator are proved.

关键词： Computational modeling Switches Generators Real time systems Parallel algorithms Circuit faults Testing

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Design, simulation and analysis of the low stray inductance bus bar for voltage source inverters

Design, simulation and analysis of the low stray inductance ...

引用

International Conference on Electrical Machines and systems (ICEMS)

作者： Liqiang Yuan Hualong Yu Xuesong Wang Zhengming Zhao State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China

Hard-switching technique under the high voltage and high current is one of main trends of high power inverters. Under this switching mode, the stray parameters of the commutating loops, especially the stray inductance of the DC bus bar, have significant influence on the switching process, electromagnetic interference and component stress of the semiconductor switches. It becomes one of the key points for the safe operation of inverters. Based on an actual 55 kW inverter, the design, simulation and analysis for its bus bar is described in this paper. The bus bar model is built with the method of Partial Element Equivalent Circuit (PEEC), and the stray parameters are extracted from PEEC model and applied in the circuit simulation. Compared with the experimental results, the modeling validity is proved, and the simplified modeling process and design principles for complex physical bus bar are presented.

关键词： Integrated circuit modeling Equivalent circuits Inductance Inverters Capacitance Conductors Analytical models

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Research scheme of self-excitation over-voltage in UHV long transmission lines

Research scheme of self-excitation over-voltage in UHV long ...

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International Conference on Advanced power system Automation and Protection (APAP)

作者： Shimin Xue Jiali He Luyu Xu Ying Wang Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University 300072 China Tianjin Electric Power Corporation 300010 China

Self over-voltage and operating over-voltage, caused by load shedding, may also occur at the same time in ultra-high voltage(UHV) long lines. Both were Superimposed on each other resulting in a great danger over-voltage. Transmission lines, transmission equipments and insulation of large generators will be seriously damaged by the over-voltage, especially large generators spindle will be twisted causing immeasurable losses. In this paper, based on 1000kV UHV long distance single and double circuit transmission lines, research ideas and suppression scheme for self over-voltage and operating over-voltage were proposed. First, causes and mechanisms which cause generator self over-voltage need in-depth be studied; Producting conditions and location, development process of self over-voltage need be accurately analysed; When self over-voltage and operating over-voltage occur simultaneously caused by load shedding, overvoltage peak and process need be studied; Study technology of control and parameter setting of arrester to effectively restrained self over-voltage and operating over-voltage; The same time, study how protection, reclosing, and other secondary equipment have an effect on operating over-voltage and self-excitation; Ultimately over-voltage integrated control system will be constructed from control devices such as protection reclosing, Etc. and various over-voltage suppression measures. In this paper, the proposed study scheme has important theory significance and economic benefits to ensure safety of future UHV grid and large generators.

关键词： Arresters Generators power transmission lines Transmission line measurements Shunt (electrical) Inductors

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Lightning Overvoltage Suppression of power Transformer in UHV GIS by Ferromagnetic Ring

Lightning Overvoltage Suppression of Power Transformer in UH...

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第七届亚太防雷国际会议

作者： Xiao Zhang Jinliang He State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical EngineeringTsinghua UniversityBeijing 100084China

Lightning overvoltage protection is of great importance to the safety of UHV *** widely used arresters can only suppress the magnitude of lightning overvoltage but lack efficiency on alleviating the *** practice, insulation failure of UHV transformer is often reported.A new protection method is proposed in this paper using ferromagnetic ring as supplement to arresters to suppress lightning overvoltage in UHV ***, equivalent model based on the characteristic of ferromagnetic material and factual dimension of the ring is established for *** of an actual 1000kV GIS is carried out to thoroughly evaluate the lightning overvoltage suppressing effect of ferromagnetic rings with different materials and structure dimensions.

关键词： ferromagnetic ring lightning overvoltage UHV

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Design and implement of an active damping LCL-filter for three-level voltage source PWM rectifier

Design and implement of an active damping LCL-filter for thr...

引用

International Conference on Electrical Machines and systems (ICEMS)

作者： Chao Liu Zhengming Zhao Ting Lu Liqiang Yuan Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China

Grid-connected LCL filter of voltage source PWM rectifier (VSR) can not only reduce the values of inductance, improve the system dynamic response, but also reduce the cost. However, LCL filter brings stability problem if no damping method is adopted. In order to guarantee the stability and high power factor of VSR at the same time, active damping control method rather than reactive damping method is required. Nowadays, the study on LCL filter is just for two-level VSR. In this paper, parameter design and damping method are being placed in three-level VSR for widely use. For a three-level PWM rectifier, a new parameter design method as well as active damping method is proposed and verified by Matlab-Simulink simulation and experiment.

关键词： Rectifiers Damping power harmonic filters Pulse width modulation Inductors Resistors Voltage control

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Reactive power Optimization of power system based on Improved Particle Swarm Optimization

Reactive Power Optimization of Power System based on Improve...

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2011 4th International Conference on Electric Utility Deregulation and Restructuring and power Technologies(第四届电力设施管制、重建及能源技术国际会议 DRPT 2011)

作者： Hao Wang Huilan Jiang Ke Xu Guodong Li Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Ti Tianjin Electric Power Corporation Technology Center Tianjin 300384China

reactive power optimization is a nonlinear,multivariable,multi-constrained programming problem,which makes the optimization process *** this paper,based on the characteristics of reactive power optimization,a mathematical model of reactive power optimization,including comprehensive consideration of the practical constraints and reactive power regulation means for optimization,is *** particle swarm optimization (PSO) has been studied,and the method based on improved particle swarm optimization for reactive power is going to be taken in this *** for the IEEE 14-bus system proves that the improved PSO algorithm used in this paper for reactive power optimization is *** algorithm is simple,convergent and of high quality for optimization,and thus suitable for solving reactive power optimization problems,with some application prospect.

关键词： power system:Reactive power Optimization Artificial Intelligence Algorithms Particle Swarm Optimization

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A self-healing reconfiguration technique for smart distribution networks with DGs

A self-healing reconfiguration technique for smart distribut...

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International Conference on Electrical and control Engineering (ICECE)

作者： Dapeng Li Shouxiang Wang Jie Zhan Yishu Zhao Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin China State grid of china technology College Jinan Shandong China

The requirement for power supply reliability and power quality has been increasing. When a fault occurs in distribution networks, fast locating and isolating the fault, restoring the power, and reducing outage time and area are becoming more and more crucial. The concept of fast self-healing has been proposed, which is also the requirement for smart grid development. In this paper, a self-healing reconfiguration technique is proposed for smart distribution networks with insertion of distributed generations (DGs). And a tree structure algorithm based on heuristic rules is proposed. Islands formed by DGs are used to deal with fault isolation and power restoration after a fault occurs. The effectiveness of the proposed algorithm is verified using a 26 bus bars test system with DGs.

关键词： Reliability power system reliability Load flow Distributed power generation power quality

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Comparison of Wind power Generation Interconnection Technology Standards

Comparison of Wind Power Generation Interconnection Technolo...

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

作者： Jidong Wang Xuhao Du Xiaojing Zhang School of Electrical Engineering and Automation Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU Tianjin China

Smart Grid is one of the hot research directions of power system. How to interconnect the wind power generation with power system safely and reliably is a major challenge in the development of Smart Grid. Wind power generation interconnection standards are the technology base, which will push the development of smart grid. This paper compares the wind power generation interconnection standards of home and abroad mainly. It is pointed out the inadequacy of existing standards and that wind power generation interconnection standards should focus on power quality and low voltage ride through. This paper can be provided as a reference to improve existing standards and establish interconnection standards of other form new energy generation.

关键词： Standards Wind power generation Wind turbines Wind farms Smart grids

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