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IEEE PES power Systems Conference and Exposition, PSCE

作者： Wen-xia Liu Li-xin Zhang Jian-hua Zhang Yong-feng Fan Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Under Ministry of Education North China Electric Power University Beijing 102206 China College of Electric and Electronic Engineering in North China Electric Power University China

Studying the optimal subsection of distribution networks feeders, a subsection scheme synthesizing load and the length of subsections is presented. Hierarchical data envelopment analysis (DEA) method is proposed for multi-objective evaluation of subsection schemes. First, the scientific assessment system is established by using the analytic hierarchy process (AHP) and the weights of assessment criteria are derived from the judgment matrix. Secondly, the actual index data is used to structure DEA model, the schemes are evaluated quantificational with regard to different assessment criteria. Finally, each scheme is evaluated comprehensively. Using this method and the evaluation system to evaluate the subsection schemes, the evaluation results show that the assessment method is scientific and effective; the subsection method presented in this paper can better meet the economic and reliability requirements and is simple and practical.

关键词： Data envelopment analysis power supplies power system reliability Switches power generation economics Maintenance Investments Costs power system economics power system planning

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A maximum power point tracking algorithm based on gradient descent method

A maximum power point tracking algorithm based on gradient d...

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IEEE General Meeting power& Energy Society

作者： Jianpo Zhang Tao Wang Huijuan Ran Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China School of Electric Engineering North China Electric Power University Baoding China

Solar energy is considered as one of the most effective, less expensive, harmless and less environment pollution effect of renewable energy sources, the problem of using solar power including varying weather condition brings different output power of the photovoltaic (PV) array, which may cause a serious waste of solar power, for solving this problem, a Maximum power Point Tracking (MPPT) strategy is always required to make PV array keep giving maximum power under different environment condition. In this paper, a variable step MPPT based on gradient descent method is proposed for faster and more precise tracking process, a model based on matlab/simulink was established to analysis the performance of the proposed MPPT strategy, simulation results prove that this MPPT method is practical with a better performance than the traditional strategies.

关键词： Solar energy Mathematical model power generation Analytical models Voltage Radio access networks Pollution Renewable energy resources Solar power generation Character generation

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Modal analysis concerning the control mode of doubly-fed induction generator

Modal analysis concerning the control mode of doubly-fed ind...

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International Conference on Sustainable power Generation and Supply, SUPERGEN

作者： Li Lin Liangliang Song Wenxia Li Sheng Jing Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China Henan Electric Power Technical Institute Management of Production & Technology Department Zhumadian Electric Power Company China

The paper deals with the impact of wind power integration on power system small signal stability. The DFIG wind turbine consisting of a back-to-back PWM converter is introduced. Generator model is given first, ignoring the transient of stator. The converter control, shaft and pitch angle control diagrams are picked out for a detailed study subsequently. A case study is performed in part three, eigen-analysis of a modified IEEE 14 system is conducted considering the PF and VT control modes of wind farm. The pole map gives an intuitionistic view that DFIG introduces two oscillation modes related to the shaft and VAR controller model respectively. Eigen-structure depicts the electromechanical oscillation modes, and comparison of DFIG and SG case was studied which gives an overall conclusion that DFIG can have a favorable performance. Also the influence of increased penetration of wind power is examined.

关键词： Modal analysis Induction generators power system modeling Wind energy power system stability power system transients Shafts power system analysis computing Wind turbines Pulse width modulation converters

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Notice of Retraction: Anti-islanding Detection and protection for Grid Connected PV System Using Instantaneous power Theory

Notice of Retraction: Anti-islanding Detection and Protectio...

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International Conference on Industrial and Information Systems, IIS

作者： Fei Wang Chengcheng Zhang Zengqiang Mi Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Foreign Language Teaching & Researching Department Hebei University Baoding Hebei China

This article has been retracted by the publisher.

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protection and control for Grid Connected Photovoltaic power Generation System Based on Instantaneous power Theory

Protection and Control for Grid Connected Photovoltaic Power...

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Pacific-Asia Conference on Circuits, Communications and Systems, PACCS

作者： Fei Wang Chengcheng Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Under Ministry of Education North China Electric Power University Baoding Hebei China Foreign Language Teaching & Researching Department Hebei University Baoding Hebei China

Reliable protection and reasonable control run an important role in grid connected PV power generation system. The detection and calculation of real and reactive power are the bases of many inverter resident passive and active islanding detection method (IDM). As well as the detection and calculation of real and reactive power also concern with the inverter control of grid connected PV power generation system. In this paper, considering instantaneous voltage and instantaneous current are periodic function about time, think of it in terms of periodic function space to define the inner product and norm, Hilbert space based power theory is proposed. Real power, reactive power and apparent power in Hilbert space based theory are defined. This proposed Hilbert space based power theory provide a novel view for the protection, islanding detection and control of grid connected PV power generation system.

关键词： Photovoltaic systems power system protection control systems Solar power generation Hilbert space power system reliability Reactive power Inverters Reactive power control Voltage

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Graph-based optimal solution for siting and sizing of grid-connected distributed generation

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2009年第4期29卷 91-96页

作者： Li, Peng Lian, Chao Li, Bo-Tao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Baoding 071003 China

Besides the conventional benefit of improving power flow, distributed generation (DG) can also be used to mitigate voltage sag and reduce line loss. In this paper, a graph and gene based algorithm was proposed to address the optimal location and capability for grid-connected DG, under the assumption of the radial distribution network and static constant power load model, meanwhile taking the characteristic of DG and its effect on network losses and voltage into consideration. This algorithm used graphic methods to solve a large number of equations. This effectively simplified the complicated process and numerous assumptions in the traditional method. Genetic algorithm with voltage boundary violation constraints was utilized to effectively prevent the bus voltage from reaching its upper boundary. Simulation of the benchmark examples and the comparsion with traditional methods show the correctness and feasibility of the proposed method. © 2009 Chin. Soc. for Elec. Eng.

关键词： Distributed power generation

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Validating measurement-based composite load model

Validating measurement-based composite load model

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8th International Conference on Advances in power System control, Operation and Management (APSCOM 2009)

作者： Jin Ma Xiao-yu Zheng Yong-hong Tang Zhao-yang Dong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Sichuan Electric Power Research Institute Chengdu China Department of Electrical Engineering Hong Kong Polytechnic University Hong Kong China

Since the digital simulation is one of the basic tools in understanding the modern complex power systems, its veracity has direct effects on the decision making on the power system operation and control. However, the accuracy of the digital simulation is dependant heavily on the model validity. Among all the dynamic components of the power system, the load is one of the most difficult one to be modeled. The difficulty lies in the fact that the scenario when the load model is built is always different from the real situation raised by the faults. So the question naturally arises that whether the measurement-based load model could be applied in the digital simulation when analyzing different operation scenarios. And to what extent does the model keep valid? It is hard to answer these questions because the field data, which constitute the basis of the measurement-based load modeling, are limited. This paper reports our work on validating the load model via RTDS. By simulating various fault situations on a model of a real provincial power system in RTDS, we could get a great amount of data to build the model as well as research its validity. Two greatly concerned problems related to the measurement-based load model are addressed in this paper; one is the possibility of applying the load model for various fault scenarios and the other is the validity of the load model when the load composition changes. Suggestions for the measurement-based load modeling practice are also given from the model validation work.

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The optimal control policies of three-phase current source rectifier based on over-modulation technique

The optimal control policies of three-phase current source r...

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International Conference on Sustainable power Generation and Supply, SUPERGEN

作者： Chunyu Zhang Yabin Li Qi Wang Chengrong Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China Key Laboratory of High Voltage & EMC North China Electric Power University Baoding China East China Electric Power Design Institute Shanghai China Department of Electrical Engineering North China Electric Power University Beijing China

ISBN: (纸本)9781424449347

This paper introduces an over-modulation technique, a continuous extension of space vector PWM (SVPWM) linear control scheme for the three-phase current source rectifier (CSR). The over-modulation range is divided into two modes depending on the modulation index (MI). In mode I, the reference angles are derived from the Fourier series expansion of the reference voltage which corresponds to the MI. In mode II, the holding angles are also derived in the same way. The strategy, which is easier to understand graphically, produces a linear relationship between the output voltage and the MI up to six-step operation. The relationship between those angles and the MI can be written in lookup tables or, for real-time implementation, can be piecewise linearized. In addition, harmonic components and total harmonic distortion (THD) of the output voltage are analyzed. When the method is applied to the V/f control of the induction motor, a smooth operation during transition from the linear control range to the six-step mode is demonstrated through experimental results.

关键词： Optimal control Rectifiers Space vector pulse width modulation Frequency synchronization Voltage Pulse width modulation inverters Pulse width modulation Switching frequency Synchronous generators power harmonic filters

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Transformer Partial Discharge Sources Number Estimation Based on Ultrasonic Array Sensors and Modified CCT

Transformer Partial Discharge Sources Number Estimation Base...

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第九届电介质材料性能与应用国际会议(The 9th International Conference on Properties and Applications of Dielectric Materials)

作者： Qing XIE Xin XIANG Nan WANG Fang-cheng L(U) Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control(North China Electric Power University) Ministry of Education Baoding 071003

ISBN: (纸本)9781424443673

Correctly estimated the number of partial discharge (PD) source is the premise of the power transformer PD location based on ultrasonic array sensors. Therefore, estimation of the number of power transformer PD source is a very necessary research work. In this paper, we proposed the modified Canonical Correlation Technique (CCT) to estimate the number of transformer PD source. The simulation experiment results confirm the validity of the method.

关键词： Transformer Partial discharge Sub-band averaging CCT number estimation

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Simulation of PD Location in power Transformer Based on Root Multiple Signal Classification Method

Simulation of PD Location in Power Transformer Based on Root...

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第九届电介质材料性能与应用国际会议(The 9th International Conference on Properties and Applications of Dielectric Materials)

作者： Yan-qing LI Qing XIE Nan WANG Xin XIANG Fang-cheng L(U) Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control(North China Electric Power University) Ministry of Education Baoding 071003

ISBN: (纸本)9781424443673

Due to the heavy calculation and low estimation precision with little signal-to-noise (SNR) of MUSIC (Multiple Signal Classification) algorithm in partial discharge location used ultrasonic phased array, in this paper, a new location method is proposed based on Root-Multiple Signal Classification(Root-MUSIC). Firstly, Root-MUSIC algorithm is used for direction of arrival estimating of PD source. Secondly, space location of PD source is realized by crossover location principle. Finally, the result of simulation based on 7×7 plane phased array model vertifies the correctness of the new method.

关键词： partial discharge root-MUSIC crossover location

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