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The 2011 International Conference on Electric and Electronics (EEIC 2011)

作者： Gu Ren Xiao Xiangning Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University

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 Ether Cat-based controller. Finally, a 10 k V/1MVA controllable current quality disturbance generator has been created. The experiment result proves that the proposed main circuit topology, control strategy and Ether Cat-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.

关键词： controllable current quality disturbance generator,multiplex cascade,decoupling control,EtherCat

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Study on emergency control based on Regional frequency response model

Study on emergency control based on Regional frequency respo...

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

作者： Zhichao Zhang Zengping Wang Xin Chen Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing China

Frequency stability refers to the ability of a power system to maintain steady frequency following a severe system upset resulting in a significant imbalance between generation and load. The rate of frequency change (df/dt) is an instantaneous indicator of power deficiency and can incipient recognition of power imbalance. The new method presented in this paper assumes the application of the WAMS as a base for their successful implementation. The adaptive scheme aims to extract the relevant power system parameters from on-line measurements. Therefore, the scheme can adapt its sensitivity to the current operating conditions, eliminating the need for many assumptions that have to make when tuning the conventional local scheme. In the predictive step, this model is used to estimate a frequency trajectory following a disturbance. The proposed scheme uses the local frequency rate information to adapt the load shedding behavior to the size and location of the experienced disturbance. Based on this prediction it can be determined whether emergency UFLS control actions are necessary.

关键词： Load modeling power system stability Adaptation models Frequency response Mathematical model Automatic frequency control

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High-power controllable Voltage Quality Disturbance Generator

High-Power Controllable Voltage Quality Disturbance Generato...

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The 2011 International Conference on Electric and Electronics (EEIC 2011)

作者： Gu Ren Xiao Xiangning Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University

This paper proposes a high-power controllable voltage quality disturbance generator, which is composed of multiplex cascade H bridge modules, and simulates many types of voltage quality problems, such as voltage swell and sag, fluctuation and flicker and so on. One side of the device connects the power system with cascade H bridge to improve voltage level. The other side connects the system directly to aviod the problems caused by series transformer, such as additional phase shifting and voltage drop. Cascade inverter H bridge modules and PWM rectifier H bridge modules are all controlled by triangular carrier phase shifting to increase the equivalent switching frequency of inverter to simplify the control. Finally, a 10 k V/2MVA controllable voltage quality disturbance generator has been created. The experiment result proves that the proposed main circuit topology, control strategy and Ether Cat-based controller are feasible and efficient.

关键词： controllable voltage quality disturbance generator,multiplex cascade,carrier phase shifting,Ether Cat

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Fault detection under strong white Gaussian noise background in power systems

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ICIC Express Letters 2011年第4 B期5卷 1473-1479页

作者： Zhang, Yagang Wang, Zengping Zhang, Jinfang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Under Ministry of Education North China Electric Power University Baoding 071003 China

Principal components analysis uses a mathematical procedure that transforms a set of correlated response variables into a new set of uncorrelated variables. The few principal components contain almost all of the information that is available in the original variables. In most of the works on communications, the transmitted data is assumed to be corrupted by Gaussian noise. In our researches, under strong white Gaussian noise background, we used mainly principal components analysis theory to resolve fault detection problem in power systems. And the simulation results are entirely identical to the actual real situation. Therefore, the detection of fault can be resolved exactly and effectively by principal component analysis. ICIC International © 2011.

关键词： Principal component analysis

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A New Approach for Finding Connected Routes of power Network and Its Application

A New Approach for Finding Connected Routes of Power Network...

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IEEE power and Energy Society General Meeting

作者： Jinfang Zhang Zengping Wang Yagang Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University

ISBN: (纸本)9781457710001

After taking the element of adjacent matrix as the function of the state of edges in the network structure, the representation of the element in corresponding adjoint matrix has been given an in-depth analysis. With the use of simplifying method on each element in adjoint matrix, the complete connected matrix could be formed equally with the each element as the set of connected routes. Based on the above analysis and processing, the new connected routes finding algorithm is established, which is a systematic method and suitable for all kinds of network connections. Finally, the successful application to substation configuration has validated the efficiency of the novel algorithm in power system topology analysis, in which the connected routes can be formed in off-line way and be used for topology analysis in on-line way. Therefore, the aim to reduce topology analysis time could be achieved.

关键词： Adjacent matrix Adjoint matrix Connected routes Topology analysis Adjoint matrix topological analysis power grids Elements

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Principal Components Fault Location Based on WAMS/PMU Measure system

Principal Components Fault Location Based on WAMS/PMU Measur...

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IEEE power and Energy Society General Meeting

作者： Zengping Wang Yagang Zhang Jinfang Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University

ISBN: (纸本)9781457710001

In this paper, a novel fault location method based on Principal Component Analysis (PCA) is proposed, in which synchronized information data are utilized provided by the WAMS/PMU measurement system. PCA method is an efficient mathematic tool to reduce dimensions. Therefore, the state matrix, consisting of raw synchrophasor information versus multi-points and various times, is compressed effectively. By the remained key features, the corresponding principal component scores could be obtained. The simulation results have shown that, according to these scores, the fault component can be confirmed exactly. A great number of simulation trials have fully proved that the results of principal component analysis are accurate and reliable.

关键词： Principal component analysis Fault Location WAMS PMU Principal component score Fault location principal components analysis Wide area measurement systems Phasor measurement units fault component Simulation results

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control design and operational characteristics comparation for VSC-HVDC supplying active/passive networks

Control design and operational characteristics comparation f...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Jianzhong Xu Chengyong Zhao Baoshun Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

The transient mathematical models of two VSC-HVDC systems which are supplying active and passive networks respectively are developed in d-q synchronous reference frames. All the controllers were designed and realized current decoupled controls by applying PI (Proportional-Integral) regulators. A 2-Level VSC-HVDC supplying active network with fixed DC voltage control in rectifier side and fixed active power control in inverter side was modeled, then a 3-Level VSC-HVDC supplying passive network with fixed DC voltage control in rectifier side and fixed AC voltage control in inverter side was modeled thereafter, then their operational characteristics were tested and compared by simulations in PSCAD/EMTDC, which verified the effectiveness and stability of the designed controllers and validated great potentiality in future VSC-HVDC projects.

关键词： power conversion Inverters Voltage control Rectifiers Mathematical model Harmonic analysis

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Establish of Accuracy Assessment Indexes of power system Real-Time Digital Simulation

Establish of Accuracy Assessment Indexes of Power System Rea...

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

作者： Xiangxu Wang Chunlin Guo Xiangning Xiao Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Monitoring and Control under Ministry of Education University North China Electric Power University Beijing China

Real-time digital simulation has been widely used in power system analysis, which is becoming a very important tool to system planning, feasibility studies, and new equipment design, and the accuracy of real-time digital simulation has great effects on the security and economic efficiency of power system operation. In this paper, residual similarity is calculated by average percentage error, and shape similarity is calculated by coefficient method. Accuracy assessment method of real-time digital power system simulation is proposed concerning the two similarity indexes from the static and dynamic perspective. During the assessment of similarity of two curves, both the residual error between the two curves and the similar extent of variation trend of the curves are considered, and the assessment result is helpful to model modification. Analysis based on measurement data of test occurring in a certain ultra HVDC transmission power system of China and the simulation results on RTDS is presented, which proves the validity of this method.

关键词： Accuracy power system dynamics Shape Mathematical model Real time systems Analytical models

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Fault analysis of different kinds of distributed generators

Fault analysis of different kinds of distributed generators

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IEEE General Meeting power& Energy Society

作者： Sumei Liu Tianshu Bi Ancheng Xue Qixun Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring & Control under Ministry of Education North China Electric Power University Beijing China

Due to the energy crisis and global warming problems, most of the countries place more and more emphasis on the development of distributed generation (DG) using renewable energy. In China the installed capacity of distributed generators is rising, from isolated micro-grid system to grid connected system. With the increasing penetration of distributed generation, especially for the converter interfaced DG, their impacts on the protection of distribution system cannot be neglected. In this paper, the models of two types of DG, i.e. converter based DFIG and inverter interfaced DG, are reviewed. Moreover, the fault analysis of the two types of DG is investigated systematically and the impacts on protections are analyzed as well.

关键词： Rotors Resistance Fault currents Stators Inverters Voltage control Generators

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Notice of Retraction: Experimental study on power flow reversal of VSC-HVDC

Notice of Retraction: Experimental study on power flow rever...

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IEEE power Engineering and Automation Conference (PEAM)

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

This article has been retracted by the publisher.

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