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检索条件"机构=State Key Laboratory of Control and Simulation of Power System"

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A PI-based control scheme for primary cascaded H-bridge rectifier in transformerless traction converters

A PI-based control scheme for primary cascaded H-bridge rect...

引用

作者： Xinghua, Tao Yongdong, Li Min, Sun State Key Lab of Control and Simulation of Power System and Generation Equipments Dept. of Electrical Engineering Tsinghua University China Dept. of Electrical Engineering Naval Engineering University China

ISBN: (纸本)9788986510119

Cascaded H-Bridge rectifier (CHBR) is a more attractive solution in traction application for its transformerless structure. Because of the currents of different cells are exactly the same one, it is a challenge job to regulate the voltages of cells with only one current controller. In this paper, a PI-based control scheme is presented to deal with the voltages balance issue in CHBR. To satisfy the demand of rectifier such as unity power factor and regulated output DC voltages, the proposed control scheme consists of two parts. One is for shaping the grid current waveform and regulating the sum of DC-link voltages of all the cells;the other one is for balancing DC-link voltages. The latter is more concerned in this paper and is discussed in detail especially. simulations and experiments are carried on. The results verified the feasibility and effectiveness of the proposed scheme.

关键词： Electric rectifiers

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Application of back propagation neural network to fault diagnosis of direct-drive wind turbine

Application of back propagation neural network to fault diag...

引用

World Non-Grid-Connected Wind power and Energy Conference, WNWEC

作者： Xueli An Dongxiang Jiang Shaohua Li State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Thermal Engineering Tsinghua University Beijing China

The vibration signals of wind turbines are highly nonlinear and non-stationary due to wind turbine operation conditions that are very complicated. The signals will be more complex when a fault occurs. Aiming at these problems, a fault diagnosis method for direct-drive wind turbine is presented based on back propagation neural network (BPNN). The time-domain feature parameters of vibration signals in the horizontal and vertical direction are considered in the method. Five experiments of direct-drive wind turbine with normal, wind wheel mass imbalance, wind wheel aerodynamic imbalance, yaw and blade break are carried out in laboratory scale. Through analyzing the features of five conditions, the time-domain feature parameters in horizontal and vertical direction of the vibration signal are selected as the input samples of BPNN. By training, the BPNN model can be constructed between feature parameters and fault types. The validity of the BPNN model is verified using test samples. The results indicate that the proposed method has higher diagnostic accuracy. It can used in on-line fault diagnosis of direct-drive wind turbines.

关键词： Wind turbines Vibrations Fault diagnosis Artificial neural networks Blades Wheels Time domain analysis

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A phase-disposition PWM method for DC voltage balance in cascaded h-bridge rectifier

A phase-disposition PWM method for DC voltage balance in cas...

引用

作者： Tao, Xinghua Li, Yongdong Sun, Min State Key Lab of Control and Simulation of Power System and Generation Equipments Dept. of Electrical Engineering Tsinghua University China Dept. of Electrical Engineering Naval Engineering University China

ISBN: (纸本)9788986510119

In this paper, a novel control scheme for cascaded H-Bridge rectifier (CHBR), which can be used as the primary end of high voltage high power multilevel converters, is presented. The controller is similar with the one for single phase rectifier. To improve the performance of the controller, notch filter and proportion resonance (PR) controller are employed and the discrete methods for them are discussed in detail. The different function of CHBR controller from the single rectifier is for voltage balancing. Therefore, the phase-disposition technology, which is used in the multilevel converter, is introduced to eliminate the voltage error from the expected value. With this approach, the states of the switches of the CHBR are decided correctly by the practical condition and then the DC-link capacitors of the cells are controlled to charge or discharge in the way which results to voltage balancing. The effectiveness of the proposed approach is verified by experimental results.

关键词： controllers

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Intelligent control Technology of Tripping and Reclosing for Double-circuit Transmission Line on the Same Tower

Intelligent Control Technology of Tripping and Reclosing for...

引用

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

作者： B. T. Li Y. L. Li Key laboratory of power system simulation and control of ministry of education Tianjin University TJU Tianjin China

Intelligent control technology of tripping and reclosing is present for double-circuit transmission line on the same tower aiming at solving the problems existing in reclosure commonly used nowadays. Way of only tripping faulty conductor(s), which can enhance the power transmission on condition of fault, is applied for each fault type. Identification of transient and permanent fault based on fault point voltage is carried out after tripping. If permanent fault occurs, the whole fault circuit(s) is(are) opened and reclosure(s) is(are) locked; if transient fault occurs, reclosing scheme in phase order is started. Breaker of the remote terminal operates first when reclosing each phase; each reclosing time delay is set at the optical reclosing time in order to damp out the oscillation and stabilize the system; reclosing angle is set at the ideal angle for decreasing transient aperiodic component of the second short circuit current.

关键词： Intelligent control Transmission lines Poles and towers Circuit faults power system transients power transmission lines power transmission Fault diagnosis Voltage Delay effects

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An Economic Evaluation Method on power Distribution system Considering N-1 Guidelines

An Economic Evaluation Method on Power Distribution System C...

引用

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

作者： Fengzhang Luo Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU Tianjin China

An economic analysis method is proposed for distribution system planning considering the N-1 guidelines, in which the fundamental properties of power supply capability and the economic benefit are combined. The economic efficiency and the potential power supply benefit of a distribution system are thus evaluated. A complete system of economic evaluation indices is presented, including the static profitability indices and the dynamic investment benefit indices. Applications show that this method and index system can take into account both the basic characteristics of distribution system and the special features of power energy that differ from general merchandise. So they can not only evaluate the economic benefits for project investment combining with the traditional approaches of engineering economics, but can also assess the economic benefits of system-owned assets for power supplying effectively, as well as for the economy evaluation of the distribution system in operation or the planning schemes. This method can even be applied to assess the economic benefits of transmission system.

关键词： power system economics power generation economics power distribution Guidelines power supplies power system planning Investments Profitability Merchandise power engineering and energy

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Modeling and simulation of Grid-connected Hybrid Photovoltaic/Battery Distributed Generation system

Modeling and Simulation of Grid-connected Hybrid Photovoltai...

引用

2010年中国国际供电会议(CICED 2010)

作者： Fei Ding Peng Li Bibin Huang Fei Gao Chengdi Ding Chengshan Wang Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin UniversityTianjin 300072China

ISBN: (纸本)9781457700668

Photovoltaic（PV）generation is the technique which uses photovoltaic cell to convert solar energy to electric energy. Nowadays,PV generation is developing increasingly fast as a renewable energy source. However,the disadvantage is that PV generation is intermittent for depending on weather conditions. Thus,the battery energy storage is necessary to help get a stable and reliable output from PV generation system for loads and improve both steady and dynamic behaviors of the whole generation system. The paper presents detailed transient models of the grid-connected PV/Battery hybrid generation system,and all these models are simulated by using MATLAB/Simulink. PV array is firstly connected to the common dc bus by a boost converter,where the battery is also connected by a bi-directional DC/DCconverter,and then integrated into the ac utility grid by a common DC/AC inverter. Maximum power point tracking helps PV array to generate the maximum power to the grid,and the battery energy storage can be charged and discharge to balance the power between PV generation and utility grid. Finally,different cases are imulated,and the results have verified the validity of models and control schemes.

关键词： Photovoltaic Generation Battery Energy Storage Hybrid simulation Maximum power Point Tracking Modeling

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Integration of protection and control systems for smart substation

Integration of protection and control systems for smart subs...

引用

2010 5th International Conference on Critical Infrastructure, CRIS 2010

作者： Ma, Jing Wang, Tong Wu, Jie Wang, Zengping Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University 102206 Beijing China State Nuclear Electric Power Planning Design and Research Institute 100094 Beijing China

ISBN: (纸本)9781424480814

Digital based data processing and protection and control system along with digital communication networks introduces new structures for substation protection and control systems and new methods for intelligent protection and control systems. This paper presents a unique vision for the future integration of protection and control systems. Firstly, the basic concept and configuration of the developed protection and control systems for smart substation is introduced. The features and functions of integrated protection and control systems for smart substation are then discussed and compared with that of the traditional substation in detail. © 2010 IEEE.

关键词： Data handling

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Nanosecond-pulse dielectric barrier discharge using magnetic compression solid-state pulsed power

Nanosecond-pulse dielectric barrier discharge using magnetic...

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IEEE International power Modulator and High Voltage Conference

作者： Shao, Tao Yu, Yang Zhang, Cheng Niu, Zheng Zhang, Dongdong Wang, Jue Sun, Yaohong Yan, Ping Zhou, Yuanxiang Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Electrical Engineering Department Tsinghua University Beijing 100084 China

ISBN: (纸本)9781424471294

Dielectric barrier discharge excitated by unipolar pulsed power is a promising approach for producing non-thermal plasma at atmospheric pressure. A magnetic compression solid-state pulse power generator is used to produce dielectric barrier discharge (DBD). The generator is capable of providing repetitive pulses with the voltage of up to 30 kV and duration of 70 ns at a 300 resistive load. This paper illustrates electrical characteristic and luminous emissions of DBD excitated by repetitive unipolar nanosecond-pulses in atmospheric air. Different from common DBD excitated by high-voltage AC sources, discharge current of DBD in the experimental investigation can be on an order of tens of amperes. When the DBD is created using two liquid electrodes, the luminous emissions from the obverse and flank sides of liquid electrodes show that no filament is observed and the discharge is homogeneous and diffuse in the whole discharge regime. © 2010 IEEE.

关键词： Dielectric barrier discharge

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Basic principles of hybrid excitation PM synchronous generator utilizing harmonic for excitation

Basic principles of hybrid excitation PM synchronous generat...

引用

2010 International Conference on Electrical Machines and systems, ICEMS2010

作者： Xia, Yonghong Wang, Shanming Ma, Mingyuan Hao, Liangliang Qiu, Arui Huang, Shaogang State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 100084 China Department of Electrical and Automatic Engineering Nanchang University Nanchang Jiangxi 330031 China

A novel method, which utilizes harmonic for excitation, is presented to adjust the air-gap magnetic field for permanent magnet synchronous machine. The structure and basic principles of the hybrid excitation PM synchronous generator(HEPMSG) are introduced. The no-load and on-load electromagnetic field are calculated based on finite element method, and the waveform and effective value of the winding voltage and characteristics of the machine are gained for different loads. Calculation results demonstrate the new hybrid excitation scheme is feasible. This new method combines the advantages of PM machines and electrical excitation machines. The machine removes the brushes and slip rings, which makes permanent magnet machine keep simple and highly reliable.

关键词： Windings Harmonic analysis Stator windings Rotors Reactive power power system harmonics

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Protection of microgrid

Protection of microgrid

引用

10th IET International Conference on Developments in power system Protection (DPSP 2010). Managing the Change

作者： Shenxing. Shi Bo. Jiang Xinzhou. Dong Zhiqian. Bo State Key Laboratory of Control and Simulation of Power System and Generation Equipments Tsinghua University China AREVA T and D Inc. Stafford UK

The paper analyses the existed protection of microgrid. And in order to meet the requirements of microgrid protection, a novel protection is presented in this paper. The protection based on local information without the need of communication, uses current traveling waves to identify faulted feeder, and the bus bar voltages to determine a event caused by fault or switch operation. In the protection scheme, current traveling waves are measured by current transducers in N line and phase lines, and wavelet multi-resolution analysis is used to decompose traveling wave signals. The initial traveling waves are compared in magnitude and polarity with each other to determine the faulted feeder. The protection is independent of microgrid operation connected with the main power grid or in island.

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