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检索条件"机构=Laboratory of Power System Protection and Dynamic Security Monitoring and Control"

共 602 条记录，以下是211-220 订阅

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Effect of Wind Farm Based-on Wound Rotor Induction Generator on Transient Characteristics of Transmission Grid

Effect of Wind Farm Based-on Wound Rotor Induction Generator...

引用

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

作者： Li Lin Feng Sun Yi-Han Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

With rapid development of wind power generation, large capacity wind farms are connected into the transmission system. Comparing with traditional power plant, the transient characteristics of transmission grid including wind farm are worthy investigating. The wind farm based-on wound rotor induction generators (WRIGs) shares high market occupancy in China, but academic researches on this grid-connected wind generation are few. So in this paper, the transient characteristics of the power system, adding a WRIGs wind farm and adding a traditional power plant, are compared. Effect of a WRIGs wind farm on transient performances of transmission grid is discussed. And the control effect on transient stability, when the WRIGs wind farm participating in system control during system fault, is investigated. Finally, simulation results are validated by using CIGREB4-39 grid. It is concluded that the transient performance of WRIGs wind farm is better than that of traditional power plant.

关键词： Wind farms Wounds Rotors Induction generators power system transients power generation power system stability control systems Wind power generation Mesh generation

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Research on a Novel dynamic Voltage Quality Regulator in Medium Voltage

Research on a Novel Dynamic Voltage Quality Regulator in Med...

引用

International Conference on Energy and Environment Technology (ICEET)

作者： Yajing Di Zhongdong Yin Xiangning Xiao Renzhong Shan Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing China

In accordance with the familiar power quality problem, such as voltage sag, flicker, harmonic suppression and short circuit fault, this paper designed a novel series voltage quality regulator in medium voltage for the multiple objective control basing on the cascaded multilevel H-bridge method, and analysis its working principle in detail. A Short-circuit current limiter is designed in this paper, the control strategy multiple objective control is proposed as well. The simulation model is established by PSCAD/EMTDC. Finally, the rationality of the main circuit topology design is tested through low-voltage experiment. The simulation result and the text show that the design of voltage regulator and the control strategy this paper proposed can compensate the voltage feasibly and efficiently.

关键词： Regulators Medium voltage Voltage fluctuations Voltage control Circuit simulation Circuit testing power quality Harmonics suppression Circuit faults Harmonic analysis

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A Study on The Black Start Capability of VSC-HVDC Using Soft-starting Mode

A Study on The Black Start Capability of VSC-HVDC Using Soft...

引用

第六届IEEE国际电力电子与运动控制会议 (2009 IEEE 6th International power Electronics and Motion control Conference-ECCE Asia

作者： Mingxia Zhou Sheng Li Jianhua Zhang Zongqi Liu Yinhui Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control (North China Electric Power University) Ministry of EducationBeijing102206China

A good Black-Start scheme is important and necessary to resume power supply fast and efficiently after black out, and how to choose black-start power is the first thing to consider in the scheme. In this paper, the advantages of VSC-HVDC as black start power are analyzed. The ability of VSC-HVDC to soft energize major power system equipment is proved through simulation by software PSCAD/EMTDC. Simulation waveforms during soft energization are illustrated. These plots have described the good voltage and frequency characteristics of VSC-HVDC. Furthermore, the transition from black start control to normal power flow control is discussed. Simulation results indicate that by using soft energization, VSC-HVDC is an ideal black start power.

关键词： black start HVDC soft energizing VSC-HVDC

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dynamic state estimator with Phasor measurements for power system electromechanical transient process

Dynamic state estimator with Phasor measurements for power s...

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IEEE General Meeting power& Energy Society

作者： Tianshu Bi Xiaohui Qin Qixun Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

Wide area measurement system (WAMS) has been widely used in power system dynamic monitoring and control, such as low frequency identification and control, stability assessment and preventive control, etc. However, as a measurement tool, phasor measurement unit (PMU) has the measurement error and bad data unavoidably. If the raw measurements are applied in power system analysis and control directly, the unexpected consequence might be resulted in. Aiming at this problem, a novel dynamic state estimator for generator state variables is proposed in this paper. The corresponding mathematical model is given in detail. Bad data detection and elimination approach is presented as well. The simulation results show that the proposed method can provide the estimated trajectories of the generators in real-time, which eliminates the impact of measurement error and bad data and could give the backbone for WAMS based dynamic applications and real-time control.

关键词： power system dynamics power system transients State estimation power measurement power system measurements control systems power system stability Wide area measurements Phasor measurement units Measurement errors

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Fault Diagnosis Based on BFS in Electric power system

Fault Diagnosis Based on BFS in Electric Power System

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International Conference on Measuring Technology and Mechatronics Automation, ICMTMA

作者： Yagang Zhang Jinfang Zhang Jing Ma Zengping Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding China

In this paper, we adopt a novel topological approach to fault diagnosis. In our researches, global information will be introduced into electric power system, we are using mainly BFS of graph theory algorithms to resolve fast and exact discrimination of faulty components and faulty sections, and finally accomplish fault diagnosis. Graph theory algorithms can be used to model many different physical and abstract systems such as transportation and communication networks, models for business administration, political science, and psychology and so on. In the study of fault diagnosis in electric power system, especially the fault diagnosis for mechanically-driven sections of equipments in power plant, graph theory algorithms must also have a good prospect of application.

关键词： Fault diagnosis Graph theory RLC circuits Voltage Circuit faults Resistors Electric variables measurement power system dynamics power system modeling Instruments

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Approach on performance evaluation and index selection for electricity distribution utilities

Approach on performance evaluation and index selection for e...

引用

IEEE General Meeting power& Energy Society

作者： Ming Zhou Weijun Zhai Gengyin Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

Establishing an effective performance evaluation method and market driven incentive mechanism is an important subject that the electric power utilities are currently facing with. By aid of Data Envelopment Analysis (DEA) method which is widely used in other industries' performance evaluation, three DEA based models are proposed to evaluate electricity distribution utilities' performances, the relative efficiency scores are then given. In addition, the improvement schemes are presented for those relative less efficient utilities. At last, an approach of sensitivity analysis with respect to evaluation indices and a method to simplify evaluation indices are presented. The empirical study shows that the proposed performance evaluation method for electricity distribution utilities is effective and straightforward.

关键词： Data envelopment analysis Performance evaluation Sensitivity analysis power system analysis computing Monopoly power system management power system economics power generation economics Regulators Logistics

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RTDS Based Maximal power Point Tracking Simulation for Doubly-Fed Induction Generator

RTDS Based Maximal Power Point Tracking Simulation for Doubl...

引用

International Conference on Energy and Environment Technology (ICEET)

作者： Jiamin Zhang Ancheng Xue Tianshu Bi Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control School of Electrical Engineering North China Electric Power University Beijing China

In the control of the wind generation, the maximal power point tracking (MPPT) control plays important role in the efficiency. This paper presents the simulation results of the MPPT control with RTDS-based DFIG model. At first, it analyzes the vector-control scheme for the MTTP, which results in independent control of active and reactive power of the generator. And then, it develops the MPPT controller implemented on the rectifier and inverter based on PI control strategic. Furthermore, it builds the DFIG model based on the RTDS with the corresponding technology. And the simulation result with the proposed model verified the control strategy.

关键词： Induction generators Wind speed power system simulation Wind energy generation Wind power generation power generation Wind energy Velocity measurement Hardware control systems

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The AC-DC hybrid transmission system ATC calculation based on continuation power flow

The AC-DC hybrid transmission system ATC calculation based o...

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International Conference on Sustainable power Generation and Supply, SUPERGEN

作者： Ning Ji Yajing Gao 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 China

ISBN: (纸本)9781424449347

Expanding the extra high voltage AC/DC hybrid transmission system and improving the transfer capability of the network are the primary tasks of the power network in China. With the increasing expansion of AC/DC transmission system scale, the super large scale hybrid network has taken shape in china, then the systematic research on ATC calculation model and algorithm for AC/DC systems is urgently needed. A new ATC computation model for AC/DC hybrid transmission system is proposed in this paper. In this model the effect of multiterminal DC system can be considered. CPF algorithm is presented to solve this model, then the ATC value of AC/DC hybrid transmission system can be gained. The algorithm based on MATLAB6.5 is developed. IEEE 14-bus test system is used to verify the presented approach.

关键词： Load flow Mathematical model power system reliability power system modeling power system interconnection Hybrid power systems Computational modeling Voltage Large-scale systems Computer languages

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power Equations and Non-Detection Zone of Passive Islanding Detection and protection Method for Grid Connected Photovoltaic Generation system

Power Equations and Non-Detection Zone of Passive Islanding ...

引用

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

作者： Zengqiang Mi Fei Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding China

Islanding detection and protection is an important concern for grid connected photovoltaic (PV) power generation system due to personnel and equipment safety. Over/under voltage protection (OVP/UVP) and over/under frequency protection (OFP/UFP) are basical inverter resident passive islanding detection method (IDM) for detecting an islanding condition by monitor parameters in point of common coupling (PCC) such as voltage amplitude and frequency and then cause the inverter to shut down when there is sufficient transition from normal specified conditions. The real and reactive power equations and Non-Detection Zone (NDZ) of OVP/UVP and OFP/UFP methods for grid connected PV system are derived and analyzed in this paper. Analyses show that the behavior of the system at the time of disconnection will depend on the imbalance power at the instant before the switch opens to form the island, these results also indicate the NDZ of OVP/UVP and OFP/UFP methods is considerable large and the reaction times for these protective methodologies may be variable or unpredictable.

关键词： Equations power system protection Photovoltaic systems Solar power generation Mesh generation power generation Voltage Frequency Inverters Switches

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A novel approach on ATC determination for AC/DC transmission systems

A novel approach on ATC determination for AC/DC transmission...

引用

IEEE General Meeting power& Energy Society

With the increasing expansion of AC/DC transmission system scale, the research on available transfer capability (ATC) for AC/DC transmission systems has important academic and practical significances to AC/DC transmission system planning, operation and reliability evaluation. However, most of the present researches on the ATC calculation are only suitable for AC transmission system, few is about the ATC analysis for AC/DC systems. In this paper a novel ATC calculation model for AC/DC transmission systems is proposed, and alternate iterative continuation power flow algorithm is presented to solve this model. ATC of an AC/DC transmission system is computed considering the impacts of DC control system on ATC and compared to one of the AC system. The algorithm based on MATLAB6.5 is developed. The modified IEEE 14-bus test system is used to verify the presented approach.

关键词： power system reliability Load flow power system interconnection power system modeling Iterative algorithms control systems Mathematical model Voltage power system dynamics power system security

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