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Prony analysis of electrical transient characteristics of AC system during HVDC commutation failure

Prony analysis of electrical transient characteristics of AC...

引用

2010 9th International power and Energy Conference, IPEC 2010

作者： Zhang, Rulian Zhao, Chengyong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding Hebei Province China

ISBN: (纸本)9781424473991

With the development of High Voltage Direct Current (HVDC) transmission, the impact of DC system on AC relay protection becomes more prominent. So it becomes more important to research electrical characteristics of AC system under DC faults. In PSCAD/EMTDC environment, the inverter commutation failure resulted from short circuit faults in AC line is simulated based on the electromagnetic transient model of Shandong grid containing Ningdong-Shandong DC transmission system. Prony algorithm is applied to analyze the electrical transient characteristics of AC system during commutation failure. The coincidence of fitted waveform and simulated waveform verified the validity of prony algorithm. Prony analysis results show that DC system injects a large number of inter-harmonic components into the inverter side AC system during commutation failure, and the distortion of the parallel line current is more serious than that of the fault line current, so the impact of DC system on the AC relay protection devices equipped on the parallel line is greater. ©2010 IEEE.

关键词： Relay protection

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A generalized reconstruction algorithm for electrical capacitance tomography 6

A generalized reconstruction algorithm for electrical capaci...

引用

6th World Congress in Industrial Process Tomography

作者： Lei, J. Liu, S. Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping District Beijing102206 China

ISBN: (纸本)9780853163220

Owing to the advantages, such as high speed, low cost, high safety, easy implementation and non-intrusive sensing, electrical capacitance tomography (ECT) is considered as a promising process tomography technology. Successful applications of ECT depend on the speed and precision of the image reconstruction algorithms. In essence, ECT image reconstruction process belongs to a typical ill-posed problem. Methods that ensure a stable numerical solution while enhancing the quality of the reconstructed images should be employed. In this paper, based on the semiparametric model, a generalized objective functional that considers the inaccuracy nature in the measured capacitance data and the model error, which has been developed using the combination estimation and a novel stabilizing functional, is created. An efficient algorithm, which integrates the beneficial advantages of the homotopy method where the homotopy equation is designed by the fixed point homotopy and solved using the fixed point iteration algorithm based on the alternate iteration scheme, the self organizing migration algorithm and the harmony search algorithm, is proposed for searching a possible global optimal solution. This algorithm is tested by the noise-free capacitance data and the noise-contaminated capacitance data, and excellent numerical performances and encouraging results are observed. Numerical simulation results reveal that the proposed algorithm is very successful in solving the ECT image reconstruction problem. In the cases considered in this paper, the reconstructed results by the proposed algorithm show salient improvement in the spatial resolution and accuracy. The spatial resolution of the reconstructed images by the proposed algorithm is enhanced, and the artifacts in the reconstructed images can be removed effectively. Furthermore, the reconstructed results under the noise-contaminated capacitance data indicate that the proposed algorithm is very competent to deal with the inaccuracy i

关键词： Capacitance

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Study on sequence component based fault phase selector during power swings

Study on sequence component based fault phase selector durin...

引用

International Conference on Critical Infrastructure

作者： Li, Wei Bi, Tian-Shu Yang, Qi-Xun 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

ISBN: (纸本)9781424480814

For digital distance relays, in order to get the correct measuring impedance, phase selector is widely used to identify the fault phases first. However, when a fault occurs at the line during power system swings, the traditional sequence component based phase selector might not identify the fault phase correctly, which leads to mal-operation of distance relays. Therefore, how to improve the existing sequence component based phase selector, especially at the condition of power system swings, is crucial. The relationship between the relative phase and amplitude of the sequence component of various asymmetric faults is analyzed. An improved asymmetric fault phase selector during power swings is proposed according to the corresponding relationship between the zero, negative sequence current components and the asymmetric fault types. The simulation results have shown the effectiveness of the method under power swings. Combining with fault component phase selector in no power swing, this method can perfectly solve the phase selection problem of transmission lines. © 2010 IEEE.

关键词： Electric relays

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Impact of load characteristic on dynamic security region of power system

Impact of load characteristic on dynamic security region of ...

引用

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

作者： Cao, Zhenbo Xue, Ancheng Li, Jin Bi, Tianshu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control School of Electrical and Electronic Engineering North China Electric Power University Beijing 102206 China

ISBN: (纸本)9781424459407

DSR (dynamic security region) is one of the direct methods focusing on the transient stability of power system. This paper focuses on the DSRs of power system with different load models, and explores the characteristic of the DSRs of the power system with constant impedance load and motor load. It deduces the algorithm for DSR of power system described with differential algebraic equation, after introducing the theory of DSR for power system with network-reduction model. And then, it presents the mathematical models for the constant impedance load and motor load. Based on the simulation results, it presents the DSRs for the power system with respect to constant impedance load and motor load, respectively. And furthermore, it compares the characteristic of the DSRs of power system with different loads, and summarizes the impact of different loads characteristic on the DSR. ©2010 IEEE.

关键词： Differential equations

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Comparison and verification of load model based on PSASP

Comparison and verification of load model based on PSASP

引用

International Conference on Critical Infrastructure

作者： Wang, Huilin Ma, Jin Zheng, Xiaoyu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control School of Electrical and Electronic Engineering North China Electric Power University Beijing 102206 China

ISBN: (纸本)9781424480814

In load model verification process, the accuracy of model and its parameters makes the actual operating conditions unable to reappear in simulation. The information deviation between measured data and verifiable simulation data makes it impossible to ensure the descriptive power of measurement- -based load model for real load characteristics. With this problem, the paper applies closed-loop verification approach to this question for the first time. The closed-loop verification approach is common in system identification study but newly used in load model comparison and validation. Two cases based on PSASP are studied in the paper. The object of this study is composite load model and the verification is carried out on a 10-generator, 39-bus New England power system. They both prove the validity of composite load model and the feasibility of this verification approach. © 2010 IEEE.

关键词： 39-bus New England power system PSASP closed loop verification approach closed-loop verification composite load model descriptive power feasibility information deviation load management load model load model comparison load model validation load model verification process measurement based load model power operating conditions power grids real load characteristics

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PCA fault location based on wide area measurement systems

PCA fault location based on wide area measurement systems

引用

2010 5th International Conference on Critical Infrastructure, CRIS 2010

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

ISBN: (纸本)9781424480814

The faults in electric power system can not be completely avoided. When power system operates from normal state to failure or abnormal operates, its electric quantities may change significantly. Our researches indicate that the variable with the biggest coefficient in principal component usually corresponds to the fault. Therefore, utilizing real-time measurements of PMU, basing on principal components analysis technology, we have completed the fault location of electric power system. Of course, because of the complexity of different types of faults in power system, there still exists enormous problems need a close and intensive study. © 2010 IEEE.

关键词： Phasor measurement units

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Research on PID parameters optimization of synchronous generator excitation control system

Research on PID parameters optimization of synchronous gener...

引用

International Conference on Critical Infrastructure

作者： Cao, Yuan Ma, Jin Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control School of Electrical and Electronic Engineering North China Electric Power University Beijing 102206 China

ISBN: (纸本)9781424480814

Synchronous generator excitation control system is one of the most important parts of power system control. And as PID control is one of the first developed and the most widely used control schemes in excitation system, its parameters tuning problem has been highly concerned. Since MATLAB genetic algorithm toolbox has the characteristics of strong robustness and efficient optimization, this paper first establishes a mathematical model of generator excitation system, and then uses ITSE index of terminal voltage step response curve as the optimization index, computes the fitness function based on SIMULINK platform, and uses MATLAB genetic algorithm toolbox to optimize PID parameters of synchronous generator excitation control system. Applying this method to a power plant's synchronous generator excitation system, results demonstrate that dynamic characteristics are improved greatly. © 2010 IEEE.

关键词： Simulink

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A new load model suitable for transient stability analysis with large voltage disturbances

A new load model suitable for transient stability analysis w...

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作者： Zheng, Xiao-Yu He, Ren-Mu Ma, Jin Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University 102206 Beijing China

ISBN: (纸本)9788986510119

Load model has great impacts on the power system simulation results, while in transient stability analysis the traditional load models have some disadvantages which can't describe the load shedding characteristic when low voltage disturbances happened. Thus, a new load model is proposed in this paper after the investigation of the field measurement data and the load characteristics of some equipment under low voltage. Several new parameters describing the load shedding characteristic are provided in the new load model which can be derived by identifying the field data. With these new parameters, the load difference caused by the load shedding during the low voltage disturbances can be well illustrated. The improved load model has larger application ranges and better properties in describing the nature of the load dynamic behaviors during the transient stability analysis which also improves the reliability of the simulation. The field measurement data illustrate its efficiency.

关键词： Transient analysis

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Compound control algorithm based on a novel topology of current compensation apparatus

Compound control algorithm based on a novel topology of curr...

引用

2010 5th International Conference on Critical Infrastructure, CRIS 2010

作者： Liu, Yukun Guo, Chunlin Xiao, Xiangning Lei, Xiao Wang, Xiangxu Wang, Jin Key Laboratory of Power Protection and Dynamic Security Monitoring and Control School of Electrical and Electronic Engineering North China Electric Power University Beijing China

ISBN: (纸本)9781424480814

This paper theoretically analyzes the compound control apparatus for current quality compensation which is designed as differentiation cascaded H bridge type with two modules: fundamental-frequency module and high-frequency module. The detection algorithm calculates the harmonic current and fundamental-frequency current of the load current which serve as the command current. For the purpose of eliminating the steady periodic error of system and improving the tracking accuracy of the compensation current, PI and repetitive controller in parallel is introduced as a advanced current control method. A detailed analysis and design for the high-frequency module is presented based on frequency characteristic and steady state. A 10kV system simulation model based on PSCAD/EMTDC is built to analyze the control strategy. Finally, the experimental results illustrate that the proposed control strategy is feasible and provide a reference for the 10kV industrial apparatus. © 2010 IEEE.

关键词： Error compensation

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A novel method for SVC using nonlinear slope reactance

A novel method for SVC using nonlinear slope reactance

引用

International Conference on Critical Infrastructure

作者： Tang, Niang Xiao, Xiang-Ning Chen, Zheng Key Laboratory of Power Protection and Dynamic Security Monitoring and Control School of Electrical and Electronic Engineering North China Electric Power University Beijing China

ISBN: (纸本)9781424480814

The structure of Static Var Compensator (SVC) control system and compensation principle is briefly analyzed in this paper. Based on the control method of nonlinear norm transformation PID, a novel method for SVC using nonlinear slope reactance is presented. The simulation results show that the method can accelerate the stabilizing process and reduce rising time and overshoot obviously. © 2010 IEEE.

关键词： Static Var compensators

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