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International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Qing Liu Zengping Wang Yan Xu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding City Heibei Province China

Thyristor controlled series capacitor (TCSC) used in power transmission line can increase the transportability and the stability of system, and decrease the system loss significantly. At the same time, TCSC brings many serious problems to transmission lines fault location and protective relaying. This paper analyzes the influence of TCSC to EHV transmission line protection, especially to the high-frequency directional protection. It can be obtained from the analyzing that the addition of TCSC to EHV transmission line would make the high-frequency directional protection unwanted operation or failure to operate. In order to solute the problems TCSC caused, this paper presents a novel transient protection scheme based on wavelet transform (WT). The simulation tests have proved that the analyzing and solution of the appearance of TCSC in EHV transmission line are correct.

关键词： power capacitors Thyristors power system protection power transmission lines control systems Stability Propagation losses Fault location Protective relaying Failure analysis

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Mathematical model of new bi-directional DC-AC-DC converter for supercapacitor energy storage system in photovoltaic generation

Mathematical model of new bi-directional DC-AC-DC converter ...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Yun Zhong Jiancheng Zhang Gengyin Li Xindi Yuan Key Laboratory of Power System Protection and Dynamic Security Monitoring and Controlunder Ministry of Education North China Electric Power University Baoding Hebei China

Energy storage system is an all-important part in photovoltaic. A new bidirectional DC-AC-DC converter for supercapacitor energy storage system in photovoltaic generation is put forward. In the beginning, some experiments on super capacitor have been performed, which shows super capacitor has good performance in quick charge and discharge. And mathematical model of the dual full-bridge bidirectional DC-AC-DC converter circuits with a transformer and its simplified model are derived. In the end, A phase current in the transformer primary side (ia) can be investigated with mathematical calculation simulation and detailed circuit simulation. The comparative result shows the mathematical model rationality. Through deduction, unified model of SESS also can be gotten.

关键词： Mathematical model Bidirectional control Supercapacitors Energy storage Photovoltaic systems Solar power generation Capacitors power transformer insulation Circuit simulation power generation

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Adaptive ant colony algorithm based on cloud model and its application in power distribution network planning

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2008年第SUPPL.期28卷 52-57页

作者： Xie, Qing Li, Yan-Qing Peng, Peng Wang, Ling Liu, Wen-Cai Lu, Fang-Cheng Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Min. of Edu. North China Electric Power University Baoding 071003 China Guangdong Power Grid Corporation Guangzhou 510600 China Beijing National Railway Research and Design Institute of Signal and Communication Fengtai District Beijing 100073 China

The distribution network structure planning can enhance the reliability and the efficiency of the grid. An adaptive ant colony algorithm based on cloud model was proposed and applied in distribution network structure planning in this paper. In view of the main disadvantage of being inclined to local convergence and slow convergence speed of traditional ant colony algorithm, the parameter ρ and Q were qualitatively controlled and dynamically selected in this paper by employing the uncertain qualitative association rule inference based on cloud model, which is one indefinite model for transformation between qualitative and quantitative knowledge. The algorithm overcomes the shortcoming of traditional ant colony algorithm, and the simulation results of power distribution network planning demonstrated the efficiency of the algorithm.

关键词： Efficiency

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dynamic secondary arc analysis and simulation research under different line model

Dynamic secondary arc analysis and simulation research under...

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IEEE Asia-Pacific Conference on Circuits and systems

作者： Lixia Zhou Zhongdong Yin Xiangning Xiao Yueting Tan Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Langfang Power Supply Corporation (North China Power Grid) Langfang China

In the extra high voltage (EHV) transmission system, the transient single-phase to ground faults are the most frequent to occur. Even after the opening of breakers in the two sides of the fault line, an induced current still exists in the arc because of the electrostatic and the electromagnetic coupling from the other two sound phases. Along with the enhancement of the voltage grade, the influence of the secondary arc becomes more and more, and may probably lead to the failure of the reclosing if the secondary arc is not extinguished promptly. In this paper, the dynamic secondary arc model (including recovery voltage and the secondary arc current) in single-phase asymmetric breaking is established based on the distribution parameters of EHV long-line. The method of twice-mode transformation is adopted to calculate the steady-state value of the secondary arc current and recovery voltage. Furthermore, the affects of different overhead line models on the secondary arc current are also analyzed through the real time digital simulation.

关键词： Analytical models Voltage power system transients Electromagnetic transients Electrostatics Electromagnetic coupling power system dynamics Steady-state Digital simulation Stability

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A VSC-HVDC fuzzy controller to damp oscillation of AC/DC power system

A VSC-HVDC fuzzy controller to damp oscillation of AC/DC pow...

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IEEE International Conference on Sustainable Energy Technologies, ICSET

作者： Chunye Li Sheng Li Fuchun Han Jingfu Shang Ermin Qiao College of Electrical and Power Engineering Taiyuan University of Technology Taiyuan China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education Beijing China China Electrical Power Research Institute China

The fast control capability of the VSC-HVDC and the process of area mode oscillations are analyzed. An auxiliary fuzzy logic controller designed in Matlab for the voltage source converter based HVDC transmission system, VSC-HVDC, to improve the stability of the AC/DC system is designed to enhance stability by increasing the deceleration energy of oscillation. Simulation results on the IEEE 4-generator AC/DC power systems have shown that the controller can enhance the dynamic stability of interconnected power systems effectively and is robust to the variation of system operating conditions and oscillation modes.

关键词： Fuzzy control Fuzzy systems control systems power systems power system stability Converters power conversion power system simulation power system interconnection power system dynamics

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Study on power factor through the similarity of waveform

Study on power factor through the similarity of waveform

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： L.X. Zhou Z.D. Yin X.N. Xiao Z.Q. Wang L. Zheng Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China North China Power Grid Xingtai Power Supply Corporation Xingtai China

With the rapid development of electric electronic technology, non-linear loads, large capacity converters, etc. increase mostly, which brings about the serious problems such as harmonics. Thus, the traditional power theory based on the average is unable to meet with the practical require. In this paper, the power definition in the sinusoidal and non-sinusoidal circuit is discussed and the waveform similarity between voltage and current is analyzed due to the criterion of minimum mean square deviation. Furthermore, the relationships among the waveform similarity factor, displacement power factor and real power factor are also discussed. The results show that power components are well analyzed in use of waveform similarity under the conditions of non-sinusoidal. At the same time, waveform similarity provides a simple but effective method for the calculation of power factor.

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A novel coordinated control strategy for improving the stability of frequency and voltage based on VSC-HVDC

A novel coordinated control strategy for improving the stabi...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Chengyong Zhao Lei Li Guangkai Li Chunyi Guo Key Laboratory of Power System Protection and Dynamic Security Monitoringand Control under Ministry of Education North China Electric Power University Baoding Hebei China

At the early stages of electric network restoration, the capacity of power system is relatively small, and adding large power load to such a power system will result in severe fluctuation of system frequency and voltage. Thus the stable operation and the restoration speed of power system will be affected seriously. VSC-HVDC (voltage source converter based HVDC) can control active and reactive power injected into network independently and rapidly. Based on the characteristics of VSC-HVDC, a coordinated control method between VSC-HVDC and conventional speed governing system is proposed to maintain the stability of frequency at the early stage of network restoration. Similarly, a coordinated control method between VSC-HVDC and automatic voltage regulator (AVR) is proposed to maintain the stability of bus voltage. The whole system model is established in RTDS environment. Simulation results show that the fluctuations of frequency and voltage are diminished remarkably, and the stability is improved by adopting the method proposed. It's conducive to expediting the restoration process of power system.

关键词： Voltage control Frequency power system stability power system restoration Converters power conversion Fluctuations power system modeling power system simulation HVDC transmission

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Study on a Super Capacitor Energy Storage system for improving the operating stability of Distributed Generation system

Study on a Super Capacitor Energy Storage system for improvi...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Juanhua Wang Jiancheng Zhang Yun Zhong Key Laboratory of Power System Protection and Dynamic Security Monitoringand Control under Ministry of Education North China Electric Power University Baoding Hebei China

A super capacitor energy storage (SCES) can be used as energy storage element of DG (distributed generation) system and provides necessary energy buffering. And it plays a very important role in improving operating stability of power system. Based on a wide voltage change scope of the SCES system, its main circuit has been designed in this paper, where bi-directional DC-AC-DC converter is regarded as transition circuit. The working situations of the SCES system under different loads have been analyzed in detail, and the corresponding system unified model is established when super capacitor is charged or discharged. According to the operating mechanics of SCES system, the relation between the stability of DG system and SCES system has been analyzed, and a better control scheme has also been designed. At last, the investigation of the SCES system and its control strategy are done with the use of exact simulation model. The simulation results verify the validity of designed scheme and the flexibility of control system.

关键词： Capacitors Energy storage Distributed control power system stability Circuit stability control system synthesis Buffer storage power system analysis computing Voltage Bidirectional control

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Study of reactive power optimization based on Artificial Immune Ant Colony Algorithm

Study of reactive power optimization based on Artificial Imm...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Siqing Sheng Jing Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Student power system and itns automation North China Electric Power University Baoding Hebei China

This paper presents an algorithm for optimizing reactive power using Artificial Immune Ant Colony Algorithm. This hybrid algorithm uses artificial immune algorithm (AIA) to give pheromone to distribute and makes use of Ant Colony Algorithm (ACA) to give the optimal solution. The ACA has been improved. The improved ACA uses the best and worst ant to update the pheromone trails and pseudorandom proportional rule. Local pheromone update mechanism, pheromone limitation and adaptive pheromone decay coefficient are increased. The objective function of the proposed algorithm is to minimize the system active power loss. This algorithm has been applied to practical IEEE 30-bus system and shows better results and convergence rate as compared to other optimal methods.

关键词： Reactive power Ant colony optimization power system security power system stability Propagation losses Constraint optimization Feedback power system protection power system dynamics Mathematical model

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Research on Failure Risk Assessment and Maintenance Tactics of Transformer based on the Extension Engineering Method and IAHP

Research on Failure Risk Assessment and Maintenance Tactics ...

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International Conference on High Voltage Engineering and Application, ICHVE

作者： Qing Xie Yun Li Yunpeng Liu Yanqing Li Fangcheng Lv Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding Hebei China Wuhan High-Voltage Research Institute Baoding Hebei China

There are many failure modes of transformer, and their probability and failure severity differ from each other. Based on the statistic data and experts advice, the probability of all failure modes are calculated, and divided into 5 grades. Meanwhile, IAHP was applied to calculate the weight of the transformer failure information, and Extension evaluation method was employed to create the frame work of the severities of failure modes qualitatively and divided them into 5 grades as well. Then, risk matrix is adopted to describe risk grades of failure modes, and power transformer risk maintenance strategies are obtained.

关键词： Risk management power transformers Failure analysis Risk analysis power system security Maintenance power system reliability power engineering and energy Probability protection

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