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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 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

2010 International Conference on Electrical Machines and systems, ICEMS2010

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

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： Cascaded H-bridge rectifier Phase-disposition PWM PR controller Voltage balance

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Effects of magnetic field on tracking failure of gamma-ray irradiated polymer insulating materials

Effects of magnetic field on tracking failure of gamma-ray i...

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IEEE International Conference on Solid Dielectrics (ICSD)

作者： B. X. Du H. J. Liu Xinhui Wang Key Laboratory of Power System Simulation and Control of Education Ministry School of Electrical EngineeringAutomation Tianjin University Tianjin China

This paper describes the effect of magnetic field on tracking failure of gamma-ray irradiated polybutylene naphthalate (PBN), polybutylene terephthalate (PBT) and polyethylene terephthalate (PET). The experiment was carried out by applying a dc pulse voltage under magnetic field. The magnetic flux density (MFD) of the magnetic filed was 495 mT and the direction of E×B was 0, 90 and 270 degrees with respect to the sample surface. The PBN, PBT and PET were irradiated in air up to 100 kGy and then up to 1000 kGy with a dose rate of 10 kGy/h by using a 60 Co gamma-source. Obtained results revealed that the tracking failure was greatly changed by gamma-ray irradiation and magnetic field.

关键词： Discharges Degradation Radiation effects Positron emission tomography Magnetic fields Polymers Insulation life

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A method of collaborative multi-path load forecasting based on maximum entropy principle

A method of collaborative multi-path load forecasting based ...

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China International Conference on Electricity Distribution, CICED

作者： Jun Xiao Xuan Zhang Lin He Li-peng Lin Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University TJU Tianjin China Tianjin Electric Power Corporation Tianjin China

ISBN: (纸本)9781457700668

This paper introduces synergetic theory and proposes multi-path load forecasting automatically coordinated approach based on the maximum entropy principle. Taking the expectation and second order central moment of forecasted results into account and using the maximum entropy principle,this synergetic load forecasting method receives the probability distribution function of the forecasted values and obtains the final high, middle and low forecasting scheme based on the probability theory. Case study has shown the model and method mentioned above can take the affection of the conflicts among different forecasting path into account in forecasting, resulting in higher precision of load forecasting.

关键词： Forecasting Predictive models Entropy Load modeling Mathematical model Equations Helium

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Discrete monkey algorithm and its application in transmission network expansion planning

Discrete monkey algorithm and its application in transmissio...

引用

IEEE General Meeting power& Energy Society

作者： Jingran Wang Yixin Yu Yuan Zeng Wenpeng Luan Key Laboratory of Power System Simulation and Control Tianjin University TJU Tianjin China BC Hydro Engineering Burnaby BC Canada

ISBN: (纸本)9781424465491

Monkey algorithm (MA) is one of the evolution algorithms originally developed for optimization problems with continuous variables. In this paper, a discrete monkey algorithm (DMA) was proposed for transmission network expansion planning, one discrete optimization problem. It includes the representation of solution, the modification of objective function, climb process, watch-jump process, cooperation process, somersault process, stochastic perturbation mechanism and termination criteria. Large-step and small-step climb process are designed to avoid the disordered climb direction during the MA optimization process. Cooperation process and stochastic perturbation mechanism are also introduced to improve computational efficiency. The proposed method is applied to a 18-bus system and the IEEE 24-bus system. Numerical results demonstrate that DMA has powerful computational capability and is capable of solving different dimensions of expansion planning problems efficiently with small population size.

关键词： Planning Optimization Algorithm design and analysis Search problems Particle swarm optimization Smart grids

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Reactive power Compensation Devices Optimization Based on Improved Ant Colony Algorithm

Reactive Power Compensation Devices Optimization Based on Im...

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International Conference on Electrical and control Engineering (ICECE)

作者： Huilan Jiang Ming He Lin Liu Huiqiang Ji Dapeng Shan Key Laboratory of Power System Simulation and Control Ministry of Education Tianjin University TJU Tianjin China Tianjin High Voltage Power Supplied Company Tianjin China

In the assumption that all load nodes are installed reactive power compensation device, injecting a variety of disturbances to the grid, through the application of improved ant colony algorithm, we can obtain the optimal control sequence under disturbance, that is current switching reactive power compensation device node location. Comparing control sequences under the various perturbations, with circulation mechanism of successive exclusion, the best installation location of reactive power compensation devices is obtain, while the system voltage deviation smaller, improving power system operation economy. In this paper, there is a planning example, the results show that the proposed method is feasible.

关键词： Reactive power Voltage control Biological system modeling Simulated annealing Heuristic algorithms

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An Improved Under Frequency Load Shedding Scheme Based on Rate of Change of Frequency

An Improved Under Frequency Load Shedding Scheme Based on Ra...

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International Conference on Electrical and control Engineering (ICECE)

作者： Huilan Jiang Geng Yan Huiqiang Ji Lin Liu Dapeng Shan Key Laboratory of Power System Simulation and Control Ministry of Education Tianjin University TJU Tianjin China Tianjin High Voltage Power Supplied Company Tianjin China

In allusion to the traditional UFLS scheme's deficiencies of changeless frequency setting value and amount of load shedding of every run, this paper proposes improved UFLS scheme which can alter the frequency setting value of the first run and the amount of load shedding of every run dynamically according to the magnitude of frequency change rate, namely the insufficient amount of active power. The simulation results of stand-alone model show that the reformative UFLS scheme can restrain the frequency falling depth effectively, fit speed controller preferably, make full use of system rotating spare capacity, and reduce the amount of load shedding and the possibility of over-cut or owes-cut.

关键词： Load modeling Generators power system dynamics Mathematical model Time frequency analysis

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Optimal Speed control system of Generator Based on Chaotic Particle Swarm Optimization

Optimal Speed Control System of Generator Based on Chaotic P...

引用

International Conference on Electrical and control Engineering (ICECE)

作者： Huilan Jiang Yang Liu Lin Liu Huiqiang Ji Dapeng Shan Key Laboratory of Power System Simulation and Control Ministry of Education Tianjin University TJU Tianjin China Tianjin High Voltage Power Supplied Company Tianjin China

In view of real-time and operational requirements of the speed control system for generating, the method of determining the traditional PID control parameters seriously affected by the operator due to the use of the experience, not accurate enough. This paper proposed chaotic particle swarm optimization (PSO) and adjustment methods based on the traditional PID in the electro-hydraulic control, establish the state equation of the speed control system, and thus to design generator speed control system based on chaotic particle swarm optimization algorithm. The simulation experiments show that the regulator has better robustness and real-time compared to the traditional PID control method, and can provide optimal control in the light of the different types of the running point and the interference.

关键词： Particle swarm optimization Chaos Generators Optimization Algorithm design and analysis Velocity control

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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

International Conference on Electrical Machines and systems (ICEMS)

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

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： Rectifiers Voltage control Voltage measurement Converters Pulse width modulation Mathematical model

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Evaluation of cascading failure in power system based on the operational reliability theory

Evaluation of cascading failure in power system based on the...

引用

International Conference on Probabilistic Methods Applied to power systems (PMAPS)

作者： Xin Zou Lin Cheng Yuanzhang Sun State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing China

ISBN: (纸本)9781424457205;9781424457212

According to the characteristics of the cascading failures in power grid, a lot of assessment methods based on the probability theory have been proposed in recent years. However, most of them ignore the influence of the changing operating conditions on the power system planning and operation. This paper assesses the risk of the cascading failure in the power system based on the operational reliability theory which considering the variation of operating states and environment of the power system. The operational reliability of the power system is calculated based on Markov Process which describes the transient probability of states. The key conception of this theory is that the failure rate and the probability of components are changing along with the life of the equipment, the operating states and the environment conditions. A new evaluation procedure is brought up to calculate the operational reliability indices which can provide the specific information of the cascading failure. The evaluating results of the test system confirm that this approach is applicable to analyze the cascading failures in real power system.

关键词： power system faults power system protection power system reliability Reliability theory power system planning power system transients power grids Markov processes Probability system testing

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The design of the on-line power quality monitoring system based on industrial computer

The design of the on-line power quality monitoring system ba...

引用

IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Le-zhu Chen Yi-jun Ge Ye-ce Qian Key Laboratory of Power Electronics & Motion Control Anhui University of Science and Technology Maanshan China State Key Laboratory of Power System Tsinghua University Beijing China

A new monitoring method of power quality based on the industrial computer is proposed. Using fast Fourier transform, synchronous sampling signal from the data acquisition card is processed. This system can analyze and display the power quality parameters. The results of the experiment show that the system can monitors and analyzes the power quality parameters in power systems with long time, and harmonic numbers can be analyzed to 100 and phase error is very small, and can monitoring a number of points at the same time. The system can reflect the changes of each power quality quickly and accurately, so the system can well adapted to the power quality monitoring requirements.

关键词： power quality Computerized monitoring Computer industry power system analysis computing Computer displays Harmonic analysis power system harmonics Fast Fourier transforms Signal sampling Signal processing

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