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IEEE power and Energy Society General Meeting

作者： Tianshu Bi Jiayin Sui Hao Yu Qixun Yang Key Lab of Power System Protection and Dynamic Monitoring & Control under Ministry of Education North China Electric Power University

ISBN: (纸本)9781457710001

Loss of field protection is of great importance for the security of large-scale generators. With the development of large-scale generators and corresponding loss of field protection, the complicated structure leads to the high possibility of loss of field faults. According to the statistical data, more than sixty percentages of the synchronous generator faults are the excitation system faults, which might cause loss of load, tie-line tripping, instability, collapse and etc. Therefore, it is crucial to identify loss of field as early as possible and take countermeasures. In loss of field protection, the impedance boundary criterion of steady state stability limit is widely used to distinguish loss of field and normal condition. However, the steady state stability limit circle is affected by the system operating modes, which might result in mis-operation of the relay. In this paper, an approach for on-line identifying system equivalent impedance is presented based on PMU measurements. The steady state stability limit circle can be adaptively fit for operating modes. The computer simulation results demonstrate that the proposed method works well.

关键词： Generator Loss of field protection Parameter identification Steady state stability limit dynamos Parameter identification Generator phasor measurement

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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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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 detection based on correlation analysis theory in complex power systems

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ICIC Express Letters, Part B: Applications 2011年第3期2卷 751-756页

作者： Zhang, Yagang Zhang, Lefeng Zhang, Jinfang Wang, Zengping Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University No. 619 North Yonghua Street Baoding 071003 China

The fault in any complex systems is inevitable. Fault detection is an important area in systems engineering. Different solution techniques using qualitative, semi-quantitative and quantitative methods have been proposed for fault detection. Because of the complicated system structures coupled with the numerous potential faulty behaviors, relying solely on manual operations for detection is almost impossible. So, automated fault detection systems are very important in maintaining the performance and enhancing the reliability of complex systems. power system is an essentially nonlinear complex system. In our researches, basing on correlation analysis theory, we have used mainly distance correlation analysis and partial correlation analysis to study the faults in complex power system. The simulation results indicate that correlation analysis is able to exactly and quickly recognize fault components, and successfully accomplish fault detection. The advantages of adopting correlation analysis theory are: easy to computer programming and large-scale numerical analysis. Correlation analysis theory can quickly and effectively detect complex power systems and achieve good detection accuracy. © 2011 ICIC International.

关键词： Fault detection

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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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On Impact of the Different Models of Generation system to power system dynamic Security Region

On Impact of the Different Models of Generation System to Po...

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

作者： Jin Li Ancheng Xue Zhenbo Cao Tianshu Bi Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing P. R. China

dynamic security region (DSR), which describing the transient stability of power system from the parameter space, has attracted a lot of attentions. However, there are few literatures concerning the impact of generation system model on the DSR. This paper focuses on the impact of generation system model including high order model of generator, excitation system, speed governor, on DSR, based on the extension of DSR theory from the power system with ordinary differential structure to the power system with differential-algebraic equation(DAE). The simulation results investigate impact of generation system, especially exciter magnitude and the governor system to DSR, i.e. DSR with different generation system model.

关键词： power system dynamics Approximation methods Mathematical model power system stability power system transients Stability analysis

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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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New Precharge and Submodule Capacitor Voltage Balancing Topologies of Modular Multilevel Converter for VSC-HVDC Application

New Precharge and Submodule Capacitor Voltage Balancing Topo...

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Asia-Pacific power and Energy Engineering Conference

作者： Jianzhong Xu Chengyong Zhao Baoshun Zhang Li Lu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Zhejiang Electric Power Test & Research Institute

ISBN: (纸本)9781424462537

This paper presents two novel topologies on precharge and submodule capacitor voltage balancing schemes of Modular Multilevel Converter (MMC) for VSC-HVDC application respectively. Firstly, A traditional precharge process of MMC was modeled in PSCAD/EMTDC, its drawbacks were summarized and a novel topology was proposed based on submodules charged synchronously;Secondly, we analyzed the principles of a traditional submodule capacitor voltage balancing scheme, clarified its limitations and another novel topology based on the essential objectives of the balancing schemes was proposed. The topology is with Double DC Bus Bars, external DC voltage source and antiparallel thyristors. Detailed analysis and simulations indicated that the two topologies presented here not only can make up the drawbacks of the conventional schemes to a certain extent, but also have great potentiality in the application of VSC-HVDC projects in the future.

关键词： HVDC transmission system based on VSC (VSC-HVDC) Modular Multilevel Converter (MMC) Precharge Submodule (SM) capacitor voltage balancing Circulating current

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