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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...

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

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 *** system,with flexible features,may generate high quality output voltage and reduce construction costs and power losses in the converter ***,the three-terminal DC system based on MMC faces more complex situations in operation and its control *** this paper,the mathematic model of three-terminal DC system based on MMC is *** according to the structure of MMC,a method of carrier phase-shift SPWM is *** the system-level control,the decoupling controller for threeterminal 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 *** simulation with PSCAD/EMTDC,the feasibility and effectiveness of the proposed model and control strategies are verified.

关键词： Modular Multilevel Converter (MMC):threeterminal DC transmission system:control strategy:multi-point DC voltage control

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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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Multi-Objective Service Restoration for Blackout of Distribution system with Distributed Generators based on Multi-Agent GA

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Energy Procedia 2011年 12卷 253-262页

作者： Li Zhang Lifang Sun The Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University 619 North of Yonghua Street Baoding City Hebei Province China

Service restoration is a problem with multiple objectives and constraints, when the distribution systems with DGs (distributed generators) come up large area blackout. In this article the model of multiple objective service restoration about distribution systems with DGs has been built, considering users’ priority, the action times of hand switches or tele-switches and network losses after service restoring. Multi-agent GA can be used to search the Pareto optimal solution set for the multiple objectives service restoration problem. Agent's competitive and selflearning actions reflect the principal of survival of the fittest and diversity. It can reduce complex rate and improve efficiency using challenge match method to form Pareto solution to store populations. At last the calculation example manifests the quickness and precision of the multiple objective service restoration for blackout based multi-agent GA, and it is better suit for the distribution system than single objective method.

关键词： Distribution network Service restoration Multi-agent GA Distributed generation Best Pareto solution

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Credibility theory applied for estimating operating reserve considering wind power uncertainty

Credibility theory applied for estimating operating reserve ...

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power Tech Conference

作者： Zhiying Xue Gengyin Li Ming Zhou Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing P.R. China

The estimation of operating reserve to guarantee the system security and economic operation is an important task in power system operation. With the rapid increase of wind power installation and its large scale integration into power systems, the uncertainty of wind power should be considered in operating reserve estimation. This paper discusses the risk from wind power forecast error and introduces the idea of wind power at risk. The total risk due to wind power forecast error is studied from two different aspects, and two sets of indices are proposed. Credibility theory is applied to get the comprehensive index which is used to estimate operating reserve. Numerical tests are done to compare the proposed approach with others. The results show that the proposed approach can give more economic operating reserve estimation without loss of system security, which may be a reference for the power systems with large scale intermittent generation to estimate operating reserve.

关键词： Wind forecasting Wind power generation Estimation Reactive power Uncertainty Portfolios Predictive models

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A binary adaptive differential evolution algorithm for dynamic economic dispatch considering significant wind power

A binary adaptive differential evolution algorithm for dynam...

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power Tech Conference

作者： Shu Xia Ming Zhou Gengyin Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing P. R. China

dynamic economic dispatch (DED) is a high-dimensional, non-convex, multi-constrained optimization problem. With the increase of wind power penetration into power systems, the DED problem becomes more difficult. In the mathematical model, the constraints of wind farm output and spinning reserve are proposed to deal with the random and unpredictable nature of wind power. In the power system with large-scale wind farm, wind power should be adjusted according to available spinning reserve capacity. To improve the searching capability of binary differential evolution (BDE) algorithm, an adaptive adjusting strategy for control parameters is adopted. At the same time, the constraints are solved by some new strategies, which can make all the particles feasible, then searching efficiency is greatly improved. The presented method is proved effective by some numerical examples.

关键词： Wind power generation Wind farms Spinning power systems Heuristic algorithms Algorithm design and analysis Mathematical model

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The Analysis and Simulation of Commutation Failure and protection Strategies

The Analysis and Simulation of Commutation Failure and Prote...

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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： Jing Wang Chengyong Zhao Jing Hu Xiaodong Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing 102206 P.R.China

Studying the HVDC typical fault-the commutation failure and its protection measures will give some guidance for HVDC engineering,also,it will improve the AC-DC power system safety and reliability with great *** on the analysis of commutation failure of HVDC,the article studies the effect of the commutation failure when the commutation buses have different kinds of AC faults on the base of CIGRE HVDC benchmark model,with the simulation of PSCAD/*** in-depth analysis of the causes of commutation failure,the type and characteristics of the fault will be done in this *** for the characteristics of HVDC system,combined with AC transmission relay protection tuning principle,conservation and protection action principle approach,are given to promoting HVDC transmission should take measures to return to *** simulation results show that the HVDC transmission recovers from commutation failure effectively after the fault is cleared due to the high controllability of the system and the reasonable protection strategies.

关键词： HVDC:commutation failure:digital simulation protection

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A Generalized Leakage Inductance-Based Method for Discrimination of Internal Faults from Inrush Currents

A Generalized Leakage Inductance-Based Method for Discrimina...

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IEEE power and Energy Society General Meeting

作者： Jing Ma Tong Wang Jie Wu Zengping Wang School of Electrical and Electronic Engineering North China Electric Power University Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University State Nuclear Electric Power Planning Design and Research Institute

ISBN: (纸本)9781457710001

A novel scheme based on generalized leakage inductance (GLI) to distinguish the inrush current from the internal fault current in the power transformer is proposed. By eliminating the mutual flux linkage in the transformer loop equation and adopting the trapezoid principle, the GLI is calculated in the real time. According to the difference between the GLI and the leakage inductance obtained from transformer manufacturer, the criterion to identify the internal fault is developed. A total of 162 experimental cases have been tested and the proposed method is able to reliably and accurately discriminate internal faults from inrush currents with easy implementation. Also, the method is suitable if it is not possible to measure the currents in the delta winding. Furthermore, the method is independent of the B-H curve and iron losses.

关键词： Generalized leakage inductance Inrush current Internal fault current power transformer Inrush current internal fault ELECTRIC TRANSFORMERS currents INFLUX ocean currents water currents magnetization curve fault currents Extravasation Transformer Core loss

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Design of Global power systems Stabilizer to Damp Interarea Oscillations Based on Wide-Area Collocated control Technique

Design of Global Power Systems Stabilizer to Damp Interarea ...

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IEEE power and Energy Society General Meeting

作者： Jing Ma Tong Wang Zengping Wang Jie Wu James S. Thorp School of Electrical and Electronic Engineering North China Electric Power University and also with the Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University State Nuclear Electric Power Planning Design and Research Institute Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University

ISBN: (纸本)9781457710001

This paper develops a systematic procedure of designing global power system stabilizers (GPSSs) based on collocated control to enhance the damping during interarea oscillations. The availability of remote signals from phasor measurement units (PMUs) enables the wide-area control in large scale systems. The closed loop eigenvalues are excluded from a region of the complex plane by the collocated control algorithm guaranteeing that low frequency modes must be damped. The optimum locations for GPSSs were selected using controllability. The damping performance of a 16-machine, 68-bus study system reinforced with GPSSs is examined in the frequency and time domains. The simulation results show that the control scheme is able to damp out interarea oscillations following possible disturbances.

关键词： PMUs Interarea oscillations Collocated control Global power system stabilizers Phasor measurement units absorption of shock dinitrophenyl-aminopropyl-methylamine Oscillations control technology Complex Plane power system stability Computer algorithms

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A methodology for vulnerability assessment of backup protection under cascading failures

A methodology for vulnerability assessment of backup protect...

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International Conference on Critical Infrastructure

作者： Yang, W.H. Bi, T.S. Huang, S.F. Xue, A.C. Yang, Q.X. Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Beijing 102206 China

ISBN: (纸本)9781424480814

To avoid undesired operation of backup protection caused by load encroachment under cascading failures, the methodology for vulnerability assessment of backup protection is studied. In this paper, the vulnerability assessment of backup protections is formulated as a mixed integer nonlinear programming problem, which is solved by the binary particle swarm optimization approach. The measurement index for assessing the vulnerability of backup protection is given as well. The simulation results on New England 39-bus system demonstrate that the proposed method can effectively assess the vulnerability of backup protection under cascading failures. © 2010 IEEE.

关键词： Particle swarm optimization (PSO)

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