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Research of Multi-Farms Transmission of Distributed Generation Based on HVDC Light

Research of Multi-Farms Transmission of Distributed Generati...

引用

International Conference on power system Technology (powerCON)

作者： Z.r. Zhang Z.d. Yin F.x. Hu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Power Dispatching and Communication Center China Southern Power Grid Company Limited GuangZhou China

Nowadays worldwide, distributed generation plays a more and more important role in world's energy supply system. But distributed resources' innate weaknesses cause some problems such as wavy output power and instability of power generation. These innate weaknesses are hard to overcome only through improving one single distributed generation plant or adding energy storage equipment etc. In this article, a new concept of connecting several AC distributed generation plants (such as wind farm) via VSC-converter, and DC distributed generation plants (such as solar cell) via DC/DC converter and forming a low voltage DC network is given. This low DC network will be integrated into AC grid in some proper way. Namely equalize these small distributed generation plants to a big power generation farm to improve stability of electricity generation. Some simulations based on PSCAD/EMTDC are also given.

关键词： Distributed control HVDC transmission Distributed power generation Solar power generation power generation Wind energy generation Wind power generation Energy storage Joining processes Wind farms

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Dielectric barrier discharge in nitrogen and argon

Dielectric barrier discharge in nitrogen and argon

引用

IEEE International Conference on Plasma Science (ICOPS)

作者： Zhan Huamao Ding Lijian Li Chengrong Li Ming Beijing Key Laboratory of High Voltage & EMC Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

Summary form only given. Dielectric barrier discharges in air are generally streamer-like discharges, however, a homogeneous discharge, called atmospheric pressure glow discharge, may be obtained in some noble gases such as helium and argon. Dielectric barrier discharges in nitrogen and argon are studied experimentally to determine mechanisms controlling the transition from glow to streamer discharge. The influences of the applied voltage, the gas gap distance, the gas pressure and other factors on the discharge are investigated. The characteristics of the dielectric barrier discharge in nitrogen and argon are analyzed and compared. The aim of the paper is to study the experimental conditions of obtaining an atmospheric pressure glow discharge in nitrogen and argon. The possibility of obtaining an atmospheric pressure glow discharge in air is examined by increasing the proportion of air in nitrogen gradually. The waveforms of the applied voltage and discharge current under different experimental conditions are reported, which is helpful to describe the characteristics of the discharge and judge whether the discharge is a glow discharge or not

关键词： Dielectrics Nitrogen Argon Glow discharges laboratories Voltage Atmospheric waves Electromagnetic compatibility power system protection power system dynamics

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An Alternative Approach for Coordinating Dispatching Day-Ahead and Real-Time Energy Markets

An Alternative Approach for Coordinating Dispatching Day-Ahe...

引用

IEEE PES power systems Conference and Exposition, PSCE

作者： Gengyin Li Ming Zhou Bo Liu Guoli 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 Department of Applied Mathematics North China Electric Power University Baoding Hebei China

The paper investigates the features of separately clearing the energy in the day-ahead market and then doing the same for the real-time market from the system operator's perspective. The analysis will show that this separate clearing mechanism is not always the most economical. An alternative approach based on co-optimization of both energy markets is presented. Considering stochastic electric demand, a novel integrated energy dispatching model (IEDM) is proposed for system operators that schedules day-ahead energy trading taking possible real-time demand and prices into account to find an optimal day-ahead dispatching scheme so as to achieve the total purchase cost minimum. Mathematical analysis is provided to illustrate the IEDM is more economical than the conventional separate dispatching approach. The IEDM solution integrates Monte Carlo simulation and linear programming with Hooke and Jeeves pattern search method. A 6-unit system example is applied to illustrate that the IEDM provides a more economical approach

关键词： Dispatching Economic forecasting Real time systems power generation economics Fluctuations Job shop scheduling power markets power system economics power system planning Frequency

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A Novel Adaptive Algorithm to Identify Inrush Using Mathematical Morphology

A Novel Adaptive Algorithm to Identify Inrush Using Mathemat...

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IEEE PES power systems Conference and Exposition, PSCE

作者： Ma Jing Wang Zengping Xu Yan Wu Jie 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 Electrical and Engineering North China Electric Power University Baoding Hebei China

A novel scheme based on mathematical morphology to distinguish the inrush current from the internal fault current in power transformers is proposed, which is derived from high non-linearity in exciting cores of transformers. Transient current signals are extracted by use of the novel morphological gradient and morphological opening and closing transform, meanwhile various kinds of additive white noises are effectively suppressed by adaptive filtering. Based on different characteristics of transients between the short circuit current and the inrush current, the transformer criterion is developed. The proposed technique is immune to CT saturation. A total of 120 Electrical power dynamic laboratory (EPDL) simulation cases are used to test the performance of the technique. This method has stability during the symmetrical inrush current and can be implemented in real time with very high accuracy. The results of different EPDL testing systems verify the feasibility and practicability of the proposed scheme

关键词： Adaptive algorithm Surges Morphology Fault currents power transformers Transformer cores Additive white noise Adaptive filters Short circuit currents Circuit faults

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Application of controllable Reactor in Suppressing the Voltage Fluctuation and Flicker under Hα control Strategy

Application of Controllable Reactor in Suppressing the Volta...

引用

International Conference on power system Technology (powerCON)

作者： L.x. Zhou Z.d. Yin J.r. Lin F.x. Hu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China postgraduate student School of Electrical Engineering North China Electric Power University Power Dispatching and Communication Center China Southern Grid.

Voltage fluctuation and flicker are mainly caused by surge load with large capacity, which may lead to the unstable operation of the motor, the poor characteristics of electrical equipments and the mis-operation of the electronic device even damage etc. Traditional SVC can adjust the reactive power ideally to maintain the system voltage of the connection point and play an excellent role in suppressing the voltage fluctuation and flicker. The minor defect is that it can not be directly applied to the ultrahigh or extra-high voltage system. This paper puts forward a topology of SVC based on the controllable reactor. It can be made into voltage at any level to connect to the ultra-high or extra-high voltage network directly, and can dynamically adjust the saturation degree of the controllable reactor according to the fluctuation of the reactive power of the system, smoothly change the reactive power it sends out, effectively suppress the voltage fluctuation and flicker. Meanwhile, H alpha control is taker as the main control strategy. The validity of proposed approach is verified by calculation and simulation.

关键词： Voltage fluctuations Voltage control Inductors control systems Lamps Automatic voltage control Static VAr compensators Reactive power control power system control power systems

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The Study of Detailed Fossil Fuel Steam Unit Model for Long-term power system dynamic Simulation

The Study of Detailed Fossil Fuel Steam Unit Model for Long-...

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International Conference on power system Technology (powerCON)

作者： Xianrong Chang Zhenjian Guan Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education(North China Electric Power University) Baoding Hebei P.R.China School of Electrical Engineering North China Electric Power University Baoding Hebei P.R.China

Long-term power system dynamic simulation needs to reflect the dynamic process of the fossil fuel steam unit when occurring severely disturbances in the power system. A physically based detailed model of the fossil fuel steam unit for power system long-term dynamic simulation has been described in this paper. The model can reflect the dynamic variation of the internal parameters accurately. In particular, the detailed model considers the dynamic impact on the turbine output from the extraction system. The simulation is much closer to the reality in the power system long-term dynamic process. This detailed model of the fossil fuel steam unit can be used for the power system long-term dynamic simulation.

关键词： Fossil fuels power system modeling power system dynamics power system simulation Turbines power generation power system stability power system transients power system analysis computing Furnaces

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Research on Restraining Low Frequency Oscillation with Flywheel Energy Storage system

Research on Restraining Low Frequency Oscillation with Flywh...

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International Conference on power system Technology (powerCON)

作者： Yun Zhong Jiancheng Zhang Gengyin Li Zhiyuan Chen School of Information Engineering University of Nanchang Baoding Jiangxi China Department of Electrical power Engineering North China Electric Power University Baoding Hebei China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Baoding Zhongli Power Science and Technology Development Company Limited Baoding Hebei China

Low frequency oscillations in the interconnected power systems are observed all around the world. Besides conventional PSS to suppress Low frequency oscillation, there are other modern FACTS devices to damp oscillation, among which flywheel energy storage system (FESS) is a comparative valid way. The theory on restraining low frequency oscillation used by flywheel energy storage system is described through transfer function diagram and complex torque coefficient. A numerical model of flywheel energy storage asynchronous motor controlled by VVVF inverter is derived from its mathematical model in alpha-beta coordinate system. Then the total model eigenvalue is analyzed. Based on analysis, attach control strategy using two parallel independent parts for active power control and reactive power control is designed in FESS to restrain low frequency oscillation. The calculation result shows that flywheel energy storage system is an effective way to restrain low frequency oscillation and enhance power system dynamic performance.

关键词： Frequency Flywheels Energy storage power system interconnection Transfer functions Torque Numerical models Inverters Mathematical model power system modeling

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power system Transient Stability Simulation Using the Precise Time-Integration Method

Power System Transient Stability Simulation Using the Precis...

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International Conference on power system Technology (powerCON)

作者： Xianrong Chang Yubin Wang Lifeng Hu School of Electrical Engineering North China Electric Power University Baoding Hebei China Power Supply Bureau of Shijiazhong Hebei China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education(North China Electric Power University) and School of Electrical Engineering North China Electric Power University Baoding 071003 Hebei Province P. R. China. e-mail: HLF873@***

Based on the precise time-integration method and the models of power system, a fast and simple simulation method for power system transient stability is discussed in this paper. This method has its advantages such as the numerical stability and programming simplicity. The techniques of factorization and sparse matrix are used in this method. The computer simulations on a real-life system prove the effectiveness of this method.

关键词： power system transients power system stability power system simulation power system modeling power system reliability Numerical stability power system protection power system dynamics power system security power system analysis computing

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A novel structure of dynamic reactive power source

A novel structure of dynamic reactive power source

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2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

作者： Yin, Zhongdong Zhang, Jianhua Xiao, Xiangning Cui, Zhengpai Long, Yunbo Key Laboratory of Power System Protection and Dynamic Securty Monitoring and Control Ministry of Education

ISBN: (纸本)0780391144

This paper puts forward a novel topology of controllable reactor, the structure is based on many small capacity thyristor controlled reactor (TCR) modules and a three-windings transformer connecting to system. The transformer secondary adopts duplex winding structure and each has multi-bank TCR modules being in delta connection. In this topology, the harmonic current injected into the power system is very small. It not only possesses all the functions a traditional TCR has, but also has many other merits such as occupying small floor space, generating little loss, easy implement control and protection scheme, and high reliability etc. A 500kvar industrial prototype is under construction in Langfang, Hebei province of ***. Digital simulation based on EMTDC/PSCAD and field test were carried out to verify the perfect harmonics characteristics of topology proposed. © 2005 IEEE.

关键词： Reactive power

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Research on the arithmetic of non-unit voltage protection for EHV transmission line based on wavelet analysis

Research on the arithmetic of non-unit voltage protection fo...

引用

2005 IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Yang, Ming-Yu Wang, Shi-Xu Mao-ying, Chen Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China

ISBN: (纸本)0780391144

This paper presents a new non-unit voltage protection algorithm for extra high voltage (EHV) transmission lines. This scheme Is developed using wavelet analysis, in which the singularity of fault transient voltage signals in one terminal Is utilized to discriminate clearly between Internal and external faults. Lipschltz Exponent (LE) Is obtained from wavelet modulus maximum to detect singularity of signals. A typical 500-kV EHV transmission system has been simulated by ATP to evaluate the scheme. The simulation results show that this scheme is capable of providing correct responses under various system configurations and fault conditions. © 2005 IEEE.

关键词： EHV power transmission

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