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IEEE General Meeting power& Energy Society

作者： Peng Guo Wenying Liu Wei Zheng Chen Liang Jingjing Zheng 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

ISBN: (纸本)9781479964161

Integration of large-scale wind power had become main mode of wind-power delivery in China, however, as the weakness of grid and diversity of VAR sources, operation voltage fluctuation of power systems integrated with large-scale wind power remains to be solved. Therefore, propose a multi-time scale reactive power coordinated control strategy regarding fast continuous and slow discrete VAR sources, design a two-level coordinated voltage control model based on property of various VAR sources. The primary control level deals with operation of discrete VAR sources such as shunt capacitor and reactor based on wind power forecast to mitigate long-term substantial voltage fluctuation of pilot buses at large time scale; while the secondary control level deals with operation of continuous VAR sources such as wind turbines, SVC and SVG to mitigate small frequent voltage fluctuation of pilot buses at short time scale. Voltage fluctuation of pilot buses is effectively mitigated by two-level coordinated control strategy. The calculation on the voltage of China's grid accommodating large-scale and centralized wind power validates that the proposed method can effectively solve the problem of voltage fluctuation of pilot buses.

关键词： Reactive power Voltage control Fluctuations Wind turbines Voltage fluctuations Wind farms Wind power generation

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The uncertainty and its influence of wind generated power on power system transient stability under different penetration

The uncertainty and its influence of wind generated power on...

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International Conference on power system Technology (powerCON)

作者： Dong Han Jin Ma Ancheng Xue Tao Lin Guoqiang Zhang Institute of Electrical Engineering Chinese Academy of Sciences Beijing China School of Electrical and Information Technology University of Sydney Australia Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education China Electric Power University Beijing China

Wind gust has the characteristics of sudden and brief increase in wind speed. Moreover, if the penetration of wind power is high, its inherent characteristics may impacts on power system stability. In order to analyze the impacts of wind gust and wind penetration on wind turbine generator further the system stability, three signals to stand for wind gust types are adopted in this paper, i.e. lope signal, 1-consine discrete signal and step signal. This paper analyzes quantitatively the uncertainties of wind generated power arising from wind speed using different wind models. Then, two-area four-machine system is modified in MATLAB, where the double-fed induction wind generators are used to simulate different wind power penetration. It is shown that different types of wind models and variations wind speed have different impacts on the generated wind power of wind farm. Moreover, it can be inferred when the penetration of wind power is high, the generated wind power outputs affect power system stability largely.

关键词： Wind power generation Wind speed power system stability Wind farms Uncertainty Stability analysis Generators

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Uncertainty analysis of load model based on the sparse grid stochastic collocation method

Uncertainty analysis of load model based on the sparse grid ...

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IEEE PES Transmission and Distribution Conference and Exposition

作者： Dong Han Tao Lin Yilu Liu Jin Ma Guoqiang Zhang Institute of Electrical Engineering Chinese Academy of Sciences 100190 Beijing China University of Tennessee at Knoxville 37996 Knoxville TN USA Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University 102206 Beijing China

There are a lot of uncertainties in load modeling and it parameter solutions, which is difficult to estimate uncertainty with traditional methods if the number of parameters is immense. This paper adopts the sparse grid stochastic collocation method for uncertainty analysis, and proposes a strategy available to calculate the multi-parameter uncertainty arising from load models. For multiple random inputs, sparse grid method can be regarded as an extension of Gaussian quadrature formulas in multi-dimensional cases. Based on the sparse grid stochastic collocation method, the collocation points can be selected among the Gaussian points of (l+1) order and lower than (l+1) order. Compared to other probabilistic analysis methods, it can not only maintain the integral precision but avoid the exponential rise of collocation points, and can greatly reduce simulation time. The case study on multiparameter uncertainty of the composite load model verifies the integral precision and the validity of the proposed method.

关键词： Uncertainty Load modeling Stochastic processes Computational modeling power systems Polynomials Analytical models

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A phase correction method of HVDC supplementary subsynchronous damping controller

A phase correction method of HVDC supplementary subsynchrono...

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10th IET International Conference on AC and DC power Transmission, ACDC 2012

作者： Niang, Tang Xiangning, Xiao Jian, Zhang Yunfei, Xu Qiushuo, Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

ISBN: (纸本)9781849197007

The turbo-generator units in the vicinity of HVDC transmission system are vulnerable to Sub-Synchronous Torsional Interactions (SSTI). Based on the AC-DC system decoupling transfer function structure of Generator rotation rate to the electric torque, a novel phase correction method of HVDC supplementary subsynchronous multiple models damping controller is proposed, and a SSDC software for adjusting and analyzing the parameters with matlab is designed. The simulation, including Hulunbier-Liaoning HVDC system in the northeast power grid in China which can arouse the SSTI, proves the feasibility and effectiveness of the method.

关键词： MATLAB

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A phase correction method of HVDC supplementary subsynchronous damping controller

A phase correction method of HVDC supplementary subsynchrono...

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10th IET International Conference on AC and DC power Transmission (ACDC 2012)

作者： Tang Niang Xiao Xiangning Zhang Jian Xu Yunfei Li Qiushuo Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing China

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A statistical evaluation of power grid fault detection

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ICIC Express Letters, Part B: Applications 2012年第1期3卷 47-52页

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

Fault detection is a traditional problem in the researches of complex power system. Relay protection is the first line of guaranteeing the safety of large-scale electricity grid. In order to serve the backup protection, the real-time or near real-time fault detection algorithm is the focus of our researches. In this paper, based on the basic principle of hypothesis testing, the F testing fault detection has been studied carefully. We have put forward an F testing fault detection system, and have discussed the statistical evaluation of power grid fault detection in detail. Extensive simulations have confirmed that the F testing fault detection is accurate and reliable. © 2012 ISSN 2185-2766.

关键词： Fault detection

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A Survey on Problems in Smart Grid with Large Capacity Wind Farm Interconnected

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Energy Procedia 2012年 17卷 776-782页

作者： Yang Peihong Liu Wenying Wei Yili School of Information Engineering Inner Mongolia University of Science and Technology Baotou China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Under Ministry of Education North China Electric Power University Beijing China

The basic concepts and development of smart grid is described. The influence of large capacity wind farm interconnected on the smart grid is analyzed particularly, following contents are emphatically presented: model of wind farm, basic operation performance, output forecasting of wind farm, power flow in smart grid including wind farm, balance of voltage and raeactive power, small disturbance stability, transient stability, faults and reliability, etc., in the hope of offering references for the fast development of smart grids absorbing more capacity of wind power.

关键词： smart grid power system wind farm stability

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Analysis of dynamic characteristics and control techniques applied to permanent-magnet direct drive generator based on double time coordinate

Analysis of dynamic characteristics and control techniques a...

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2011 International Conference on Mechatronic Science, Electric Engineering and Computer, MEC 2011

作者： Tang, Niang Hao, Jun-Wei Zhou, Shuang-Ya Xiao, Xiang-Ning Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Beijing 102206 China

ISBN: (纸本)9781612847221

The dynamic operating characteristics of direct drive permanent magnet synchronous generator (PMSG) were researched. A method of non-linear slope pre-charge for DC-bus voltage is proposed on purpose of protecting power electronic devices. By further analyzing, some problems of conventional control strategy for grid-connection are pointed out, and a novel analysis method named double-time coordinate system is proposed, based on which the corresponding control strategy is presented to suppress the gear twisting moment and reduce the impact of grid connected. Simulation and experimental results prove that the proposed theoretical analysis method and control strategy is effective under the platform PSCAD/EMTDC. © 2011 IEEE.

关键词： Permanent magnets

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Sliding mode variable structure direct power control of permanent-magnet direct drive generator

Sliding mode variable structure direct power control of perm...

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2nd Annual Conference on Electrical and Control Engineering, ICECE 2011

作者： Tang, Niang Xiao, Xiang-Ning Guo, Jing Zhou, Shuang-Ya Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing China

ISBN: (纸本)9781424481637

The pulse width modulation technique and dynamic operating mode characteristics of direct drive permanent magnet synchronous generator (PMSG) are researched firstly. A novel sliding mode variable structure directed power control algorithm applied to PMSG is proposed, and then design the controller using tip speed radio and flux-weakening control scheme. It can not only provide a constant switching frequency without involving any synchronous speed coordinate transformation and generator side phase information, but also can reduce the capacitance of generator-side converter. Simulation and experimental results show that the proposed theoretical analysis method and control strategy is effective under the platform PSCAD/EMTDC. © 2011 IEEE.

关键词： Permanent magnets

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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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2011 International Conference on Advanced power system Automation and protection, APAP 2011

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

ISBN: (纸本)9781424496198

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. © 2011 IEEE.

关键词： Frequency response

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