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IASTED International Conference on Modelling, Simulation, and Identification, MSI 2009

作者： Xue, Ancheng An, Pinghua Bi, Tianshu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

ISBN: (纸本)9780889868106

Low frequency oscillation (LFO) is harmful to power system security and stability. The traditional solutions for LFO are the power system stabilizers (PSSs) with local signals implemented on the excitations. This paper explores the governor-side damping controllers for LFO with wide area measurement system (WAMS). Design strategy of governor-side damping controller using remote signals from WAMS with time delay is proposed based on the partial state feedback theory, the time delay is dealt with the Pade approximation. Simulation results in a 2-area 4-generator power system show the effectiveness of the proposed governor-side damping controller.

关键词： Electric power system measurement

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Electromagnetic and electromechanical transient hybrid real-time simulation technology based on RTDS used in subsynchronous resonance research

Electromagnetic and electromechanical transient hybrid real-...

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

作者： Li, Wei Xiao, Xiangning Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

ISBN: (纸本)9781424459407

In this paper, power system electromagnetic and electromechanical transient hybrid real-time simulation technology is expounded in details, which has advantages of the electromagnetic transient simulation program and electromechanical one. The more details needed to analyze the dynamic characteristics of power systems are provided by this hybrid simulation technology, and the scale of power system simulated is not limited in the hybrid simulation program. The hybrid simulation program is applied to analyze the power system subsynchronous oscillation problem occurred in a power plant with 4 turbine generators located in the northwestern China. According to the simulation results, it is clear that the stability of generators is threatened by the subsynchronous oscillations caused by capacitor series compensation in the transmission line connecting the power plant and the load center system. In meantime, the effectiveness of the countermeasure is validated simultaneously by the hybrid simulation results. ©2010 IEEE.

关键词： Electromagnetic simulation

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RETRACTED ARTICLE: Experimental study on power flow reversal of VSC-HVDC

RETRACTED ARTICLE: Experimental study on power flow reversal...

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2011 IEEE power Engineering and Automation Conference, PEAM 2011

作者： Yang, Yongchun Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding China

ISBN: (纸本)9781424496884

Both peak-regulating of the connected power grid using VSC-HVDC in normal or emergency power support each other in the case of both sides of AC system have fault via VSC-HVDC, are dependent on its rapid reversal of power flow at any time according to *** the mathematic model and control strategy of rectifier and inverter in two phase synchronous rotating coordinate is given, then an open physical experimental device of VSC-HVDC that has upper and lower controller is set up. To maintain the stabilization of the DC bus voltage and suppress the current, active power oscillation in the power flow reversal progress of VSC-HVDC ,a lot of experiments are carried out, the rusults show that the power flow can transit smoothly when the control objectives change and the experimental device of VSC-HVDC has good dynamic performance. © 2011 IEEE.

关键词： Electric power system control

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Wide area measurements-based model validation and its application

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IET Generation, Transmission and Distribution 2008年第6期2卷 906-916页

作者： Ma, J. Han, D. Sheng, W.-J. He, R.-M. Yue, C.-Y. Zhang, J. Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing 102206 China Limited CNCRC Universal Plaza Chaoyang District Beijing 100016 China

Simulation veracity is very important to the plan and operation of a power system. Too optimistic a simulation will put the system at risk whereas too pessimistic a simulation will waste investments. Wide area measurements (WAMs), one of the fast developing technologies in recent years, could record the synchronized phasors in the whole power grid, which provides the possibility for simulation validation work. Recent contingency reproduction work worldwide has shown the inaccuracy of current digital simulation. Therefore simulation validation and model calibration are necessary to enhance simulation veracity. However, because of the complexity of the power system, it is difficult to find the erroneous ones among a large amount of components, which makes the simulation validation a very challenging problem. A new approach for WAMs-based simulation validation work is proposed. The proposed method is very simple and easy to be implemented in the available power system simulation software. Then, the trajectory sensitivity method is applied to the parameter calibration work. Real applications via the proposed methods in the big NE power grid of China are studied, which fully show the efficiency of the proposed methods. © 2008 The Institution of Engineering and Technology.

关键词： Computer software

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key technologies of three-terminal DC transmission system based on modular multilevel converter

Key technologies of three-terminal DC transmission system ba...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies

作者： Yang, Xiaodong Zhao, Chengyong Hu, Jing Wang, Jing Yang, Liu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

ISBN: (纸本)9781457703638

A three-terminal DC transmission system based on modular multilevel converter (MMC) is developed to solve the problem of power supply for distributed islands or cities. The system, with flexible features, may generate high quality output voltage and reduce construction costs and power losses in the converter stations. However, the three-terminal DC system based on MMC faces more complex situations in operation and its control strategies. In this paper, the mathematic model of three-terminal DC system based on MMC is deduced. Then according to the structure of MMC, a method of carrier phase-shift SPWM is introduced. As the system-level control, the decoupling controller for three-terminal DC system based on MMC is designed. A multi-point DC voltage control strategy based on DC voltage error method, which doesn't need communication between converter stations, is proposed to improve the system reliability. By simulation with PSCAD/EMTDC, the feasibility and effectiveness of the proposed model and control strategies are verified. © 2011 IEEE.

关键词： Voltage control

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Effect of wind farm based-on wound rotor induction generator on transient characteristics of transmission grid

Effect of wind farm based-on wound rotor induction generator...

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

作者： Lin, Li Sun, Feng Yang, Yihan Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Beijing China

ISBN: (纸本)9781424424870

With rapid development of wind power generation, large capacity wind farms are connected into the transmission system. Comparing with traditional power plant, the transient characteristics of transmission grid including wind farm are worthy investigating. The wind farm based-on wound rotor induction generators (WRIGs) shares high market occupancy in China, but academic researches on this grid-connected wind generation are few. So in this paper, the transient characteristics of the power system, adding a WRIGs wind farm and adding a traditional power plant, are compared. Effect of a WRIGs wind farm on transient performances of transmission grid is discussed. And the control effect on transient stability, when the WRIGs wind farm participating in system control during system fault, is investigated. Finally, simulation results are validated by using CIGREB4-39 grid. It is concluded that the transient performance of WRIGs wind farm is better than that of traditional power plant. © 2009 IEEE.

关键词： Wind farm

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Analysis of power line tower lightning surge impedance using the time domain electromagnetic method

Analysis of power line tower lightning surge impedance using...

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4th Asia-Pacific Conference on Environmental Electromagnetics, CEEM'2006

作者： Mingxia, Zhang Xiang, Cui Lin, Li Changzheng, Gao Zhibin, Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding China

ISBN: (纸本)1424401836

A time domain electromagnetic field approach is proposed to investigate the lightning surge impedance of the full scale UHV tower with grounding system. The model, which is validated by comparing the result to those of other method, can be used to analyze the lightning surge performance of a power line more accurately. Finally, this method is applied to analyze the surge impedance and potential of a real UHV tower.

关键词： Electric lines

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Study on the SVPWM algorithm of N-level inverter in the context of non-orthogonal coordinates

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Frontiers of Electrical and Electronic Engineering in China 2006年第2期1卷 199-204页

作者： XIAO Xiang-ning JIANG Xu LIU Hao LIU Hui-wei KONG Sheng-li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power UniversityBeijing 102206China Electric Power of Henan Zhengzhou 450000China

In this paper,the authors propose a new space vector pulse width modulation(SVPWM)algorithm based on non-orthogonal coordinates for N-level ***,it is pointed out that classicalαβcoordinates-based SVPWM has many shortcomings because of improper coordinate ***,a non-orthogonal coordinates-based SVPWM is proposed to solve these *** proposed algorithm can easily identify which sector the reference space vector falls in and conduct simple operations to find the duty cycle of each ***,it is verified that the proposed SVPWM is actually a pulse−width modulation(PWM)technology based on line voltages.

关键词： power electronics N-Level SVPWM KL coordinates

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The structure and realization of voltage sags monitoring system based on GPRS and web

The structure and realization of voltage sags monitoring sys...

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2006 China International Conference on Electricity Distribution, CICED 2006

作者： Chen, Pengliang Xiao, Xiangning Tao, Shun Ye, Zhifeng Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University 102206 China

ISBN: (纸本)0863416381

In this paper, the status of the study on the voltage sags monitoring at home and abroad is summarized. Based on the GPRS wireless communication and Web technology, the dynamic monitoring and data analysis system has designed for monitoring the voltage sags uninterrupted in a local network. The voltage sags in the receiving end network region are recorded, analyzed and counted by this system, at the same time, the information of these sags is transmitted to a remote computer using GPRS. This system can provide the policy-making support for alleviating the voltage quality questions. Based on Web, clients can login the service to scan periodical and non-periodical statistics reports of sag events.

关键词： monitoring

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High-power controllable current quality disturbance generator

High-power controllable current quality disturbance generato...

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International Conference on Electric and Electronics

作者： Gu, Ren Xiao, Xiangning 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)9783642216961

This paper proposes a high-power controllable current quality disturbance generator, which is composed of multiplex cascade H bridge modules, and simulates current quality problems, such as positive and negative current distrubance, current fluctuation, harmonic current and so on. The device adopts a topology with decoupling fundamental and harmonic current. A power module parallel-connected on the fundamental connection reactance outputs harmonic current, while cascade fundamental power modules generate fundamental and low order harmonic current, which realizes decoupling control of fundamental and harmonic current. This paper proposes the control strategies of all types of current disturbances, and the EtherCat-based controller. Finally, a 10kV/1MVA controllable current quality disturbance generator has been created. The experiment result proves that the proposed main circuit topology, control strategy and EtherCat-based controller are feasible and efficient. The emergence of this device creates a fundamental platform for measurement, analysis, evaluation and control of current quality in grid. © 2011 Springer-Verlag Berlin Heidelberg.

关键词： controllers

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