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检索条件"机构=State Key Laboratory of Power System Operation and Control Department of Electrical Engineering"

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Experimental investigation and analysis for gearbox fault

Experimental investigation and analysis for gearbox fault

引用

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

作者： Shaohua Li Dongxiang Jiang Minghao Zhao State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Thermal Engineering Tsinghua University Beijing China

As an important component of a wind turbine drive chain, the high failure rate of the gearbox can have a serious impact on the operation of wind turbine units. The fault diagnosis of the gearbox is therefore important for the safety of wind turbine units. In this paper, a gearbox experiment rig was built, experiments on the gear surface spalling fault were held on the rig under laboratory conditions, the shaft vibration displacement signals were collected, related vibration signals were analyzed by time domain, amplitude domain, frequency domain and wavelet analysis, and the results of different analysis methods were compared. The results show that the waveform of normal and fault signals are similar, the amplitude of the signals will change while the fault happens, and the wavelet analysis is more effective than frequency domain analysis on gearbox fault features extraction.

关键词： Shafts Spectrogram Gears Frequency domain analysis Wind turbines Amplitude modulation Feature extraction

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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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state of the art of hybrid excitation permanent magnet synchronous machines

State of the art of hybrid excitation permanent magnet synch...

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2010 International Conference on electrical Machines and systems, ICEMS2010

作者： Wang, Shanming Xia, Yonghong Wang, Xiangheng Su, Pengsheng Huang, Shaogang Zhang, Anming 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 Military Deputy Department Dalian 426 Factory No.1 Yanhai Jie Xigang Qu Dalian Liaoning 116005 China

The hybrid excitation permanent magnet machine (HEPMM) combines two kinds of excitation: permanent magnet (PM) and electrical excitation, so it possesses the advantages of PM machines and overcomes the incapability of regulating the excitation field. By now many HEPMM schemes have been presented. In this paper the operation principle, structure, advantages and disadvantages of these HEPMMs have been reviewed and compared in detail. These HEPMMs are classified into three types by new classification method - placement of PM and iron poles. At last novel harmonic excitation HEPMM is proposed and discussed.

关键词： Iron Magnetic fields Windings Stator cores Rotors Stator windings Magnetic circuits

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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...

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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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A systematic gain setting method of the positive feedback anti-islanding scheme for inverter-based distributed generators

A systematic gain setting method of the positive feedback an...

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International Conference on power system Technology (powerCON)

作者： Xiaoyu Wang Shouzhen Zhu Jing Yong Jinghong Zheng Wilsun Xu State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China State Key Laboratory of Power Systems Department of Electrical Engineering Tsinghua University Beijing China Department of Electrical and Computer Engineering University of Alberta Edmonton AB Canada

This paper proposes a systematic gain setting method for the positive feedback anti-islanding scheme which is designed to protect the interconnected inverter-based distributed generators (DGs) from islanding operation. Two main factors affecting the performance of the anti-islanding scheme are investigated when the positive feedback gain is tuned. One is the stability impact of the anti-islanding control on distributed generation (DG) systems and the other is the islanding detection time of the anti-islanding scheme. The small-signal model and the electromagnetic transient simulation model of an inverter-based DG system are developed to facilitate the realization of the proposed gain setting method. This method provides a practical and reliable tool for DG planning engineers.

关键词： Laboratories Electromagnetics

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Simple PEEC model of complex DC power bus

Simple PEEC model of complex DC power bus

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Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC)

作者： Fangzheng Li Xudong Sun Lipei Huang Department of Control Engineering Academy of Armored Forces Engineering Beijing China State Key Laboratory of Power Systems Department of Electrical Engineering Tsinghua University Beijing China

ISBN: (纸本)9781424456215;9781424456239

PEEC model of DC bus is an accurate and effective way to analyze the transient process and EMI characteristic of converters. However, the PEEC model with normal partition method is very complicated. It is necessary to construct a brief and legible model. This paper proposes the partition rules and constructs the simple model of the DC bus in an H-bridge unit. Transient process analysis and two-port network analysis proved the simple model provides reasonable accuracy.

关键词： Transient analysis Equivalent circuits Inductance power system modeling Electromagnetic modeling power system transients Electromagnetic interference Insulated gate bipolar transistors Electromagnetic compatibility Sun

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Real-time Environment Protecting Supervision and control system of heavy load companies in the Inner Mongolia Electric power Grid

Real-time Environment Protecting Supervision and Control Sys...

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World Congress on Intelligent control and Automation (WCICA)

作者： Wei Hu Fei Xu Xiaohai Wang Youhua Hou State Key Laboratory of Power System Department of Electrical Engineering Tsinghua University Beijing China Inner Mongolia Power Company Limited Hohhot Inner Mongolia China

Using advanced computer information technology and power system, Real-time Environment Protecting Supervision and control system (REPSCS) of heavy loads in the Inner Mongolia Electric power Grid is studied. REPSCS can monitor the operation of the heavy load companies' main equipment and environmental protection electrical equipment. The operation data of those key equipment are collected, processed, transferred and applied, and the above features are integrated into an on-line monitoring and information management system to complete. At the same time, through the latch linkage between the main equipment and the key environmental protection equipment, we achieve the enterprise's environmental monitoring and control. The system is aimed at the practical needs of China's provinces and cities area design, system technology maturity and reliability of industrial applications have been tested in a very wide range of applications. As China's environment protection and energy facilities, environmental monitoring and penalties continue to increase; real-time monitoring system for the environmental protection facilities of the high load companies will be the first choice. Its market demand is very apparent and urgent. Therefore, this project is environmentally friendly energy saving, and it can promote scientific and technological progress and improve the operation and management level.

关键词： DSL power system dynamics control systems Companies Monitoring Real time systems

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Robust PSS design considering power system contingencies based on a recursive PSO

Robust PSS design considering power system contingencies bas...

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World Congress on Intelligent control and Automation (WCICA)

作者： Zhen Wang Deqiang Gan C.Y. Chung K.P. Wong Chen Shen College of Electrical Engineering University of Zhejiang Hangzhou China Department of Electrical Engineering Hong Kong Polytechnic University Hong Kong China State Key Laboratory of Power System Department of Electrical Engineering Tsinghua University Beijing China

A systematical approach that can synthesize system contingencies into probabilistic PSS design is developed. A critical contingency screening is first conducted by a ranking of contingencies according to a probabilistic small signal stability index. A multi-objective optimization model is formulated to seek satisfactory system damping performance under both pre-contingency and post-contingency situations. A recursive Particle Swarm Optimization (PSO) technique is then used to solve the optimization model. Performance of the proposed model and solution is tested and investigated on an eight-machine system and The potential and superiority of the proposed method over other two intelligence computation methods is reported.

关键词： Damping Probabilistic logic Eigenvalues and eigenfunctions power systems Optimization Tuning Stability analysis

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The generating mechanism and optimal control of power quality in micro-grids

The generating mechanism and optimal control of power qualit...

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International Conference on power system Technology (powerCON)

作者： Xi Li Zhongqiu Wang Gengyin Li Ming Zhou K L Lo Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow UK

As an important component of distribution network, micro-grid is the necessarily development trend for future. Micro-grid has greatly improved the random problems of distributed generation (DG). However, DGs, the power electronic equipments inevitably bring about power quality problems, especially voltage flicker and harmonics. This paper tries to study the operating regulations of micro-grid in order to find out the generating mechanism and propagation characteristic of power quality problems. Taking the photovoltaic (PV) system for an example, the micro-grid simulation model has been set up. The experiments show that an appropriate control strategy coordinating every part can improve the power quality of micro-grid greatly. This paper finds out the factors affecting power quality and their harm degrees, explaining the reasons of power quality problems. Coordinating every unit, this paper set up an optimal control strategy and proper parameter settings, trying to improve power quality of micro-grid to the largest extent.

关键词： power quality Biological system modeling Inverters Harmonic analysis power grids Integrated circuit modeling Voltage fluctuations

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An improved grey model for forecasting spot and long term electricity price

An improved grey model for forecasting spot and long term el...

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International Conference on power system Technology (powerCON)

作者： Zheng Yanan Gengyin Li Ming Zhou Shan Lin K L Lo Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow UK

With the deepening reform to power industries, power systems are going to gradually open the demand side and the power consumers have to face the changes of their role in the market, and make a preliminary long-term forecasting for the electricity prices. In order to consider the relations between the spot market and the long-term contract market, this paper builds a multi-electricity price grey model to comprehensive forecast the prices of the 2 markets; further researches the structure of the background value, and improves the multi-electricity price grey model; and introduces the residual error, the related grade, the mean variance ratio and the little probability of error as test indexes. The test results show that the multi-electricity price grey forecasting model and its improved model have better accuracy, and the improved model has stronger adaptability and extends the application range.

关键词： Forecasting Contracts Predictive models Electricity Accuracy Fitting Indexes

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