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Study on controllable reactor magnetic structure and loss based on ANSYS

Study on controllable reactor magnetic structure and loss ba...

引用

IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Z.Q. Wang Z.D. Yin L.X. Zhou Z.J. Wang L.R. Ma Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing China

ISBN: (纸本)9781424427994

controllable reactor is an important voltage control and reactive power compensation device in power system which is wide range voltage application, high reliability, low harmonic and simple maintenance, etc. The reactor iron core magnetic field distribution directly affects the reactor's loss and other properties. In this paper, aiming at six kinds of typical controllable reactor core structure, magnetic field is analyzed in theory and then the core magnetic field distribution analysis are compared for the first time by model building in the finite element analysis software ANSYS and imposing different exciting currents. Moreover, six kinds of core structure's loss are compared by the use of the ANSYS inner set loss algorithm and the influence of excitation on the loss for a particular core is verified. The analysis results indicate that finite element analysis software can effectively analyze and compare the magnetic field distribution and the loss for different kinds of reactor core structure.

关键词： Inductors Magnetic losses Magnetic cores Magnetic analysis power system reliability Magnetic fields Voltage control power system harmonics Finite element methods control systems

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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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Vulnerability assessment for communication network of Substation Automation systems to cyber attack

Vulnerability assessment for communication network of Substa...

引用

IEEE PES power systems Conference and Exposition, PSCE

作者： Nian Liu Jianhua Zhang Hao Zhang Wenxia Liu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Under Ministry of Education North China Electric Power University Beijing China Automation and information security North China Electric Power University China

The Substation Automation system (SAS) is a crucial element of power system control. The devices of SAS with remote-control functions are one of the main target of cyber attack. The vulnerability assessment for communication network of SASs that supporting the analysis of control process, is an unsolved problem. Combined with the characteristics of SAS and the vulnerability assessment of the distributed systems, a vulnerability assessment method for communication nework of SASs to cyber attack is proposed. The substation communication system has been classified into six basic models used to construct vulnerability state graph (VSG). The vulnerability of single action is defined based on exponential distribution function including parameters called vulnerability factor and equivalent attacking cost, and then the vulnerability value of target systems are calculated by four connection types of VSG. Furthermore, a vulnerability factor quantity method based on AHP-TOPSIS is designed. An evaluation instance is constructed from IEC 61850 standard, the proposed method is applicable to evaluate the vulnerability of communication network of SASs.

关键词： Communication networks Substation automation Synthetic aperture sonar IEC standards power system control Automatic control Process control Communication system control Exponential distribution Cost function

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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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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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Probabilistic estimation of PCC loss due to voltage sags in large power systems

Probabilistic estimation of PCC loss due to voltage sags in ...

引用

International Conference on Sustainable power Generation and Supply, SUPERGEN

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

ISBN: (纸本)9781424449347

In this paper probabilistic estimation of PCC loss is approached in distribution systems. For the difficulty of directly solving the impedances of the star-connected equivalent model, a port-based model is adopted for voltage magnitude calculation under four fault types (TPF, SLGF, LLF and DLGF). The specific energy (SE) function is used to evaluate voltage sags involving the voltage magnitude and sag duration simultaneously, and PCC loss is directly computed from the trip probability density, which derives from the normal probability distribution function of SE. The distribution characteristic of balanced and unbalanced faults is also considered. The estimation method for PCC loss is proved fast and effective by IEEE RBTS system.

关键词： power quality power systems Voltage fluctuations Circuit faults power system protection power system faults power system simulation power system modeling Impedance Probability

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A novel active islanding detection method based on current-disturbing

A novel active islanding detection method based on current-d...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Peng Li Yinbo Sheng Ling Zhang Xilei Yang Yishu Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding China Shandong Electric Power Research Institute Jinan China

Desired islanding detection method not only can detect islanding within acceptable duration, but also require it has less adverse impact on power quality. This paper presents an active islanding detection method for a distributed resource (DG) unit which is coupled to a utility grid through grid-connected converter. With the proposed method which is based on adding periodical disturbing current through current controller of the interface voltage-sourced inverter, islanding can be effectively detected. But when the disturbing current remains unchanged, this method still has some shortages, so this article improved it and used a changed time-varying disturbing current ending with faster detecting time and less disturbing. The studies reported in this paper are based on time-domain simulations in the PSCAD/EMTDC environment. And the results show that the proposed islanding detection method always meets the two-second UL detection requirement.

关键词： Voltage control Inverters control systems power systems power conversion Frequency Condition monitoring Laboratories power system protection power system dynamics

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Design of PV Array Model Based On EMTDC/PSCAD

Design of PV Array Model Based On EMTDC/PSCAD

引用

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

作者： Jinhui Xue Zhongdong Yin Bingbing Wu Jun Peng Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China North China Electric Power University Beijing Beijing CN

Along with consuming of fossil energy step by step, crisis of energy has been appeared. The solar energy, which is endless, is a kind of renewable energy. Radiation of sun coming to earth in a day is equal to the energy, which is released by trillion buckets of oil. The research of solar energy generation has stepped into a very activity period. This paper analyses the physics characteristic of photovoltaic array firstly, then researches the mathematical model applying in engineering, and designs the total simulation model based on power electronic circuit in the end. In order to validate the correctness and validity, this paper makes a simulation as an example. The scheme can express the V-I characteristic of photovoltaic array very well.

关键词： EMTDC PSCAD Solar power generation Solar energy Photovoltaic systems Mathematical model Circuit simulation Renewable energy resources Sun Earth

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A method of tracking voltage flicker envelope real-time

A method of tracking voltage flicker envelope real-time

引用

IEEE General Meeting power& Energy Society

作者： Xiufang Jia Qing Chen Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China North China Electric Power University Baoding Hebei China

Fast and accurate tracking of voltage flicker envelope is significant to the performance of flicker meter, flicker source location and the mitigation of voltage flicker. Using the energy of a signal and its shifted signals to track the envelope of voltage flicker is presented in this paper. It is assumed that the signal is shifted, once by a lead angle equal to beta, and at another time by a lag angle equal to beta, which generates two new signals u + (t) and u - (t). According to the energy differences, the relationship between the flicker amplitude and u(t), u + (t), u - (t) can be obtained, so the voltage flicker envelope is successfully tracked. How to obtain the shifted signals u + (t), u - (t) is analyzed in the paper. The frequency error e f (%), amplitude error e m (%) and waveform standard deviation sigma(%) are used as the weighing index of the accuracy of tracking flicker envelope. The theoretical analyzing and RTDS simulation test verify that the suggested method is accurate, fast and anti-noise.

关键词： Voltage fluctuations Frequency Signal analysis Envelope detectors power quality Wavelet transforms Narrowband Filters Blind source separation Noise reduction

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