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IEEE International Conference on Sustainable Energy Technologies, ICSET

作者： Jianhua Zhang Sheng Li Jingfu Shang Weiwei Zhao Chunye Li Department of Electrical Engineering the School of Electrical and Electronic Engineering North China Electric Power University Beijing China Key laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education Beijing China College of Electrical and Power Engineering Taiyuan University of Technology Taiyuan China

This paper builds the dynamic mathematic model of the three-level Neutral Point Diode Clamped (NPC) converter, discusses the fundamental principles of the active and reactive power control for three-level Voltage Source Converter based HVDC (VSC-HVDC) system. To fully utilize the controllability of VSC-HVDC, multi-target controller is developed to control AC and DC system respectively. Improved sine wave PWM (ISPWM) technique is designed to raise the DC voltage utility rate. Real time digital simulation (RTDS) is done to verify the validity of the proposed control strategy and controllers and demonstrate the good performance of VSC-HVDC.

关键词： Converters power conversion control systems Pulse width modulation Mathematics Mathematical model power system modeling Diodes Reactive power control HVDC transmission

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Experimental study on relationships between partial discharge signals and apparent discharge magnitude in XLPE cable

Experimental study on relationships between partial discharg...

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International Conference on Condition monitoring and Diagnosis, CMD

作者： Wei Wang Xu Cheng Chong Liu Fei Zong Xueliang Shen Beijing Key Laboratory of High Voltage & EMC Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China Beijing Electric Test and Research Institute Beijing China

ISBN: (纸本)9781424416219

Based on the experiment carried out in the lab on several cables in which there are some typical PD models, the relationship between the single acoustic signal generated by the partial discharge and the apparent discharge magnitude in a line frequency cycle are researched. Further more, through the detection system which is combined of the VHF PD detection method and the acoustic emission detection method, the expressions of the relationship between the voltage value, which is gotten directly from the detection system and the apparent discharge magnitude are gotten by the curve fitting method. At the same time, the method of locating the defect manually with the acoustic sensor is introduced simply in the paper.

关键词： Partial discharges Acoustic signal detection Acoustic emission Cables Signal generators Frequency Voltage Fault location Curve fitting Acoustic sensors

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Detection method of partial discharge in XLPE Cable accessories based on the method of VHF combined with acoustic emission

Detection method of partial discharge in XLPE Cable accessor...

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International Symposium on Electrical Insulating Materials

ISBN: (纸本)9784886860057

Based on the experiment carried out in the lab on several cable accessories in which there are some typical PD models(In this paper, they are the models of protrusion discharge and floating discharge), the method of VHF Combined with acoustic emission (AE) for detecting PD in the XLPE cable accessories was introduced. The time domain characters of the AE and VHF signals are researched and compared in order to distinguish the PD signal from the disturbance. Two kinds PD spectrum of Qmax-phi and N-phi were analyzed and contrasted between the VHF and acoustic emission PD signals, which are protrusion discharge and floating discharge. The way to locate the PD point was also introduced. The results of the research had proved that the reliability of the PD detection is improved using the combined method.

关键词： Partial discharges Acoustic emission power cables Discharges Joints Fault location Acoustics

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A new solution to generators start-up sequence during power system restoration

A new solution to generators start-up sequence during power ...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Qiang Liu Libao Shi Ming Zhou Gengyin Li Yixin Ni Key Laboratory of Power System Protection and Dynamic Security Monitoring and Contro under Ministry of Education North China Electric Power University Baoding China National Key Laboratory of Power Systems Shenzhen Tsinghua University Shenzhen China Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong China

Optimal generators start-up strategy in the restorative control of a power system following a blackout is a complex, multi-stage decision optimization problem. A novel solution strategy involving the corresponding model and approach to this problem is presented in this paper. The aim of the method is to maximize the total MWh load served over a restoration period whilst considering the corresponding constraints. The proposed model is first discretized as a series of knapsack problems with respect to each time step. The classic backtracking search method is employed to solve those knapsack problems. Moreover, the optimal generators start-up solution procedure is illustrated as well. The proposed method, to some extent, can make the trade off between the simulation precision and the computing efforts better. Case studies based on a modified 15-generator test system as benchmark are carried out to demonstrate the effectiveness and validity of the proposed model and method.

关键词： power generation power system restoration power system control power system modeling Optimal control control systems power systems Search methods Computational modeling system testing

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Novel modeling and control of doubly-fed variable-speed constant-frequency wind power generator

Novel modeling and control of doubly-fed variable-speed cons...

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33rd Annual Conference of the IEEE Industrial Electronics Society, IECON

作者： Qihui, Liu Fang, Yu Jianhua, Zhang Key Laboratory of Power System Protection Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing 102206 China

ISBN: (纸本)1424407834

Reasonable modeling and control is of significance for theory study and practical operation of doubly-fed variable speed constant frequency (DFVSCF) wind power generator. Two sorts of simulation models called no-load model and generation model were obtained through linearization and discretization of the state equations of doubly-fed induction generator (DFIG), which was derived from the DFIG model in synchronously rotating reference frame. Both models work in coordination one after another to achieve the whole simulation of DFIG before and after grid-connection. Based on the field-oriented vector control technique, the decoupling control of output power of DFIG, together with grid synchronization, was investigated. The maximum power point tracking (MPPT) was realized by control of DFIG active power. The simulation results, which are highly consistent with the experiment results, verify the validity and correctness of the theoretical analysis and control strategy proposed by this paper. ©2007 IEEE.

关键词： Equations of state

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Imitation of the characteristics of the wind turbine based on DC motor

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Frontiers of Electrical and Electronic Engineering in China 2007年第3期2卷 361-367页

作者： LIU Qihui HE Yikang ZHAO Rende Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North Electric Power UniversityBeijing 102206China College of Electrical Engineering Zhejiang UniversityHangzhou 310027China

This paper analyzed the operating principles and power and torque characteristics of the wind turbine and the direct current motor (DC motor), and investigated the operating characteristics of the wind turbine compared to that of the DC motor. The torque imitation scheme, which has good performance and high feasibility, together with the whole wind turbine imitation system, was provided. The wind turbine imitation system includes not only a hardware platform composed of PC, data-collection board and thyristor-based velocity-regulator, but also monitor software of wind turbine imitation. The experimental results of different occasions verify the correctness and feasibility of the wind turbine imitation scheme proposed in this paper, which provided a valid idea for wind turbine imitation and investigation of wind power generation techniques in the laboratory.

关键词： wind turbine DC motor imitation character-istics wind power generation

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Multi-agent architecture of energy management system based on IEC 61970 CIM

Multi-agent architecture of energy management system based o...

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8th International power Engineering Conference, IPEC 2007

作者： Wei, Song Xiangnan, Wang Houji, Cao Guowei, Pan Lab. of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Edu. North China Electric Power University Baoding 071003 Hebei China

ISBN: (纸本)9789810594237

With the development of electric power market, the centralized legacy energy management system (EMS) is hardly adaptive to the polytrope of market environment. Firstly the definitions of agent as well as multi-agent system (MAS) are analyzed. Then based on the knowledge of ontology and considered IEC 61970 common information model (CIM) as the data ontology of EMS region, the structure of ontology for EMS is established. And concerned with the function and application of EMS, a new and open type of EMS-oriented multi-agent architecture is presented. Lastly simple object access protocol (SOAP), one of the prevalent web service technologies, is adopted to transmit data among agents, and the multi-agent communication mechanism is designed. This architecture can meet the ever-increasing requirements of reliability and interoperability for EMS of new generation, and be suitable for the trend of information interaction in power system via Internet. © 2007 RPS.

关键词： Ontology

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IEEE Women in Engineering Magazine 2007年第1期1卷 16-17页

作者： Leslie Prives Key Laboratoty of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei Province China

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Modeling of the Wind Turbine with a Permanent Magnet Synchronous Generator for Integration

Modeling of the Wind Turbine with a Permanent Magnet Synchro...

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IEEE General Meeting power& Energy Society

作者： Ming Yin Gengyin Li Ming Zhou Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China electric Power University Beijing China

The paper presents the dynamic model and control schemes of a variable speed pitch wind turbine with permanent magnet synchronous generator (PMSG). The model includes a PMSG model, a pitch-angled controlled wind turbine model and a drive train model. The drive train model uses one-mass model to represent the mechanical characteristics of the generator set. The generator model is established in the dq-synchronous rotating reference frame. The wind turbine model details the mechanism of variable speed operation of the turbine by a pitch control. The control schemes in the paper include a pitch angle control for the wind turbine and a speed control for the generator. The pitch angle control uses wind speeds and electric power output as the input signals to ensure normal operation in high wind speed. The speed control is realized through field orientation where the d-axis current is set to zero and the q-axis current is used to control the rotational speed of the generator according to the variation of wind speed. In order to verify the presented model and the control strategy, simulations with MATlab/Simulink software have been conducted. Simulation results prove the validity of the model and the control schemes.

关键词： Wind turbines Permanent magnets Synchronous generators Mathematical model Mechanical variables control Electric variables control Wind speed Magnetic variables control Velocity control Wind energy generation

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A Mathematic Model and its Iterative Algorithm on Obtaining Optimal Capacity of P-S Station

A Mathematic Model and its Iterative Algorithm on Obtaining ...

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2007 International power Engineering Conference (IPEC2007), vol.1

作者： Fang Cao Li-zi Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

With rising electricity loading in developing country, measuring capacity of pumped-storage station (P-S station) is becoming more critical. This paper tries to establish mathematic model on obtaining capacity of P-S station for maximum cost sayings. The paper first deducts the relationship between capacity of P-S station, peak load and the vale load by simulating cost curve of thermoelectric unit, and then deducts the formula for calculating optimal capacity of P-S station. Based upon these findings and the load curve, the paper then develops the curve to describe the relationship between volume of generated electricity and capacity of the P-S station and provides the solution for obtaining optimal capacity of the P-S station. Finally, the paper discusses the impact of selecting initial solution or certain iterative solution on iterative speed and suggests the direction for further research.

关键词： Iterative methods Optimization methods Pumped storage power generation

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