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IEEE/PES Transmission and Distribution Conference and Exposition

作者： Song, F. F. Bi, T. S. Li, H. Y. Yang, Q. K. Liu, Y. IEEE China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Beijing 102206 China Beijing Power Company Beijing China

ISBN: (纸本)9780780391932

In this paper, a novel method for perturbed trajectory prediction of post-fault rotor angle is presented based on PMU (phasor measurement unit) measurements and trigonometric function curve fitting technique. A mathematical model about the relationship of post-fault rotor angle and time is derived from a speed-governing system model, which reveals that the perturbed trajectory of the post-fault rotor angle can be expressed by trigonometric functions. By curve fitting technique, a least square method to predict the perturbed trajectory using trigonometric function is proposed. Numerical simulations are conducted on IIEEE 9-bus system to test the effectiveness of this method. The proposed method can give more reasonable and more promising prediction results as compared with polynomial curve fitting technique.

关键词： trajectory predictions rotor angle wide area measurement rolling time window least square method

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Study on WAMS based multi-swing stability assessment for power systems

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2006年第16期26卷 38-45页

作者： Song, Fang-Fang Bi, Tian-Shu Yang, Qi-Xun Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under North China Electric Power University Changping District Beijing 102206 China

With the increasing of grid-size, the problems of power system stability become more and more prominent. Meanwhile, it is very urgent to achieve quantitative stability analysis for the operation of electricity market. The advent of WAMS (wide area measurement system) provides a new way for studying multi-swing stability of power system. In this paper, a curvature vector of an electric machine kinetic energy-power angle curve is defined firstly, and then the relationship between the defined curvature vector and the corresponding individual machine stability is analyzed. The validity of the relationship is proved in detail. Therefore, the curvature vector of kinetic energy-power angle curve as a new stability assessment function is proposed. A new criterion of stability assessment based on WAMS is proposed. Numerical simulations are conducted on IEEE-9 bus system and 6 machines-22 bus system of China EPRI to demonstrate the effectiveness of this criterion.

关键词： Electric power systems

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Modeling of VSC-HVDC and control strategies for supplying both active and passive systems

Modeling of VSC-HVDC and control strategies for supplying bo...

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2006 IEEE power Engineering Society General Meeting, PES

作者： Gengyin, Li Ming, Yin Ming, Zhou Chengyong, Zhao IEEE 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)1424404932

An equivalent continuous-time state-space model for VSC-HVDC in the synchronous dq reference frame has been established in the paper. Based on the model, relevant control strategies have been developed for the cases of supplying active and passive systems. The Multi-Input Multi-Output (MIMO) control schemes are emphasized in designing power controller and voltage controller. The scheme features feed forward compensation to decouple the d- and q-axis of the Voltage Source Converter (VSC) model, which ensures the independent control of active and reactive power, DC voltage and reactive power as well. Simulations have been performed on PSCAD/EMTDC, a visual design environment for power system studies. The validity of the mathematic model and the feasibility of the control strategies have been proved by the simulation results. © 2006 IEEE.

关键词： Synchronous machinery

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Assessment of power system black-start plans based on analytic hierarchy process and data envelopment analysis

Assessment of power system black-start plans based on analyt...

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7th IET International Conference on Advances in power system control, Operation and Management, APSCOM 2006

作者： Liu, Yan Gu, Xue-Ping Zhang, Dan Key Laboratory of Power System Protection Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China Dispatching Center of Yunnan Power Company Kunming 650011 China

ISBN: (纸本)0863412467

Reasonable black-start plans are necessary for restoring the power system quickly. Based on analytic hierarchy process (AHP) and data envelopment analysis (DEA), a novel strategy for assessing black-start plans is proposed in this paper. First, the objective and requirements of restoration are analyzed thoroughly. So, assessment hierarchy is divided appropriately through employing AHP and the relative importance of assessment criteria is identified. Secondly, plans are compared with regard to different assessment criteria by means of DEA. Finally, plans are assessed comprehensively through integrating results of first two steps. The application to a practical power system verifies that the strategy could provide dispatchers more exact decision references.

关键词： Analytic hierarchy process

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Reconfiguration of network skeleton based on discrete particle-swarm optimization for black-start restoration

Reconfiguration of network skeleton based on discrete partic...

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2006 IEEE power Engineering Society General Meeting, PES

作者： Liu, Yan Gu, Xueping IEEE 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)1424404932

The black start restoration of a power system after a complete blackout is a very important issue to safety of the power system. The reasonable network reconfiguration strategy is necessary for establishing the main network and restoring loads as soon as possible. A skeleton-network reconfiguration strategy is proposed in this paper. Through determining the skeleton network, the burden of network reconfiguration can be reduced effectively. The reconstructing processes are evaluated by a comprehensive index of network reconfiguration efficiency. Furthermore, discrete particle-swarm optimization is employed in reconstructing network skeleton and several relatively-optimal schemes can be obtained as the guidance of the system restoration. Application to the IEEE 30-bus power system shows that reconfiguration schemes derived from the strategy are effective under uncertain system situations and ensure that the following restoration be successful. © 2006 IEEE.

关键词： Electric power systems

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Damping characteristic research of complex electric power system with several kinds of controllers

Damping characteristic research of complex electric power sy...

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7th IET International Conference on Advances in power system control, Operation and Management, APSCOM 2006

作者： Ma, Yanfeng Zhao, Shuqiang Yi, Yu Key Laboratory of Power System Protection North China Electric Power University Dynamic Security Monitoring and Control under Ministry of Education Baoding 071003 Hebei China Chengdu Technical College of Electric Power Chengdu 610072 Sichuan China

ISBN: (纸本)0863412467

There are many PSS and additive damping controllers of FACTS in modern power systems. As the interaction among controllers is important to power system stability, the damping characteristic study of such system with multicontroller is necessary. In this paper the AC/DC mixed power system with PSS, DCM and additive damping controller of TCSC is analyzed by the signature analysis method, the damping characteristic of complex power system is gained and the effect of adjustable parameter of controllers on damping and the interaction among controllers are studied. The conclusions we have drawn will have important guiding significance to the coordination and stability control.

关键词： Damping

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Direct torque control with space vector modulation for induction motors fed by cascaded multilevel inverters

Direct torque control with space vector modulation for induc...

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IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

作者： Yi, Wang Heming, Li Xinchun, Shi Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University 619 Yonghua North Street Baoding 071003 China

ISBN: (纸本)1424401364

Direct torque control (DTC) has achieved utilization on two-level inverters and three-level diode-clamped inverters, and it has high performance of speed control. But DTC hasn't been utilized to cascaded multilevel inverters at present. In this paper, a novel space vector modulation (SVM) approach for cascaded multilevel inverters is presented firstly. Then by combining it with the DTC approach based on SVM, the approach of using DTC to cascaded multilevel inverters is presented. And it is verified by using a three-cell cascaded frequency control laboratory system. The proposed approach solves the issues that switching state table is difficult to generate and switching frequency is not fixed, which is arisen from using conventional DTC to cascaded multilevel inverters. It will be of benefit to the utilization of DTC on the speed control of induction motors fed by cascaded multilevel inverters. © 2006 IEEE.

关键词： Induction motors

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A new method of transformer monitoring on-line based on acoustic wave analysis

A new method of transformer monitoring on-line based on acou...

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2006 China International Conference on Electricity Distribution, CICED 2006

作者： Zhao, Shutao Yan, Jiawen Li, Baoshu Niu, Wendong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 China Shandong Electric Power School Tai-an 271000 China

ISBN: (纸本)0863416381

With the electrical load increasing rapidly, the fault probability of power equipment is also rising greatly. This paper put forwards a new method of monitoring transformer-running state based on acoustic wave analysis. Firstly, the acoustic wave signal of the transformer running is collected by the system on chip (SOC) microcomputer. Then the signal is stored by a high-capacity secure memory (SD) card. The sound intensity and spectrum of acoustic wave is different when the power transformer running between normal and abnormal condition. Finally, the fuzzy algorithm is utilized to analyze the state of transformer. It is proved that the monitoring system based on acoustic wave analyzing can find the transformer's incipient fault on-line, and the transformer running safety and reliability can be assurance effectively.

关键词： system-on-chip

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Real-time running state monitoring of power equipment based on image recognition

Real-time running state monitoring of power equipment based ...

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2006 China International Conference on Electricity Distribution, CICED 2006

作者： Zhao, Shutao Zhu, Xiaohui Li, Baoshu Niu, Wendong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 China Shandong Electric Power School Tai-an 271000 China

ISBN: (纸本)0863416381

It is a new method that monitoring the power equipments state based on image analyzing, and it can improve the automatic level of power system. Not only the video frequency would be monitored and recoded, but also the images analyzing and recognizing can be done, and it leads the incipient fault to be discovered on-line. The computer captures remote equipments images, calculates images' moment invariants as characteristic vector of recognition, recognizes power equipments by support vector machine (SVM). The system further analyzes images and find if images has convex hull, intensive stochastic noise, or false edges, sequently make a conclusion whether the running state of equipments is in order. Replace of scouting by people themselves, the use of image recognition in power system can timely find troubles and potential troubles of power equipments. So the power equipments can be inspected and maintains its working state, which would improve the running reliability of the unattended substation.

关键词： Image recognition

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ATSC dynamic reactive power compensation device and its effect on improving the power quality

ATSC dynamic reactive power compensation device and its effe...

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7th IET International Conference on Advances in power system control, Operation and Management, APSCOM 2006

作者： Li, Peng Zhang, Tianfeng Bai, Qian Sun, Wei Key Laboratory of Power System Protection Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding 071003 Hebei China Angang Group New Steel CO.LTD Anshan 114015 Liaoning China

ISBN: (纸本)0863412467

A method of the thyristor rapi switched capacitors is presented in this paper, which breaks through the bondage of the conventional methods. In addition, a novel algorithm of two time reactive power has been presented, with which reactive power can be calculated fast. Meanwhile, with microcomputer synchronous phase lock technology, quick switching without transition can be realized, dynamic reactive compensation for impact load can be achieved, and the total response time is shorter than 16 ms. This technology not only can compensate reactive current dynamically but also can improve the voltage waveform to a certain extent. In the end, the type test waveforms and the users' field test waveforms are given to show the validity and effectiveness of this technology. This method is an effective way to improve power quality.

关键词： Thyristors

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