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检索条件"机构=Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under MOE"

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Application of microgrid in distributed generation together with the benefit research

Application of microgrid in distributed generation together ...

引用

IEEE General Meeting power& Energy Society

作者： Zhe Zhang Gengyin Li Ming Zhou Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

Microgrid technologies are highly developed in low voltage networks, improving the power supply reliability and energy efficiency. Therefore, in this paper, the concept, including the configuration, principle and operation of microgrid, will be specified, comparing the microgrid with the prior distributed generation. Additionally, in order to justify the feasibility, the economical benefit analysis of the application will be identified via some methodological viewpoints which are advised to regulate the operation of the microgrid in an economical approach. At the end, the costs, benefit and the share of the microgrid and micro-generation are discussed by analyzing the test case.

关键词： Distributed power generation Generators Reliability power supplies Cogeneration power system reliability

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Research and implementation of expanding the size of electromechanical transient in the hybrid real-time simulation

Research and implementation of expanding the size of electro...

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International Conference on Critical Infrastructures, CRIS

作者： Na An Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Changping China

ISBN: (纸本)9781424480807

In this paper, concerning the limitations of this method which can not meet the current needs of the development of large-scale power system, a new electromechanical transient simulation model based on dynamic equivalent is proposed. It develop a new vision for the electromechanical transient and electromagnetic transient hybrid simulation, which presents the application of dynamic hybrid simulation equivalent in hybrid simulation. Two cases are studied, electromechanical Simulation of IEEE14 nodes system, and hybrid simulation of electromagnetic transient and electromechanical transient on RTDS was developed, in the condition that the electromagnetic transient part is an actual DC system. The simulation results show that dynamic equivalence presented in the paper is valid and effective. On this basis, hybrid simulation based on dynamic equivalence is realized, thereby expanding the simulation size of AC system.

关键词： Generators power system dynamics Transient analysis Real time systems Circuit faults

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A new substation configuration algorithm based on the graphic characteristic of the main electrical connection

A new substation configuration algorithm based on the graphi...

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International Conference on Critical Infrastructures, CRIS

作者： Jinfang Zhang Zengping Wang Yagang Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

ISBN: (纸本)9781424480807

In order to overcome some disadvantages of the conventional adjacent matrix method, the relationship between the elements of the adjacent matrix and the connected routes among nodes is analyzed as the fundamental introduction. Subsequently, the graphic characteristic of the main electrical connection in power plant or substation is extracted as three types: single branch, two branches in-parallel and multi-branches in-parallel, and an unified principle for the formulation of connected routes among arbitrary two nodes in wiring connection is also proposed as the cornerstone for the novel method. Thirdly, a novel method of substation configuration is established based on the set of connected routes among arbitrary two nodes, and by mean of taking the route state as variables, the value of connected routes set is used to directly determine the element in corresponding place of the adjacent matrix. Finally, the example results show that the new method is able to finish the original topology analysis and track the state status of switches more accurately and rapidly.

关键词： Substations Topology Algorithm design and analysis Graphics Network topology Bridges

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Synthetic evaluation of power quality based on entropy of relative intensity and local variable weight

Synthetic evaluation of power quality based on entropy of re...

引用

2010 International Conference on power system Technology: Technological Innovations Making power Grid Smarter, powerCON2010

作者： Li, Guodong Li, Gengyin Fu, Xueqian Zhou, Ming Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping 102206 Beijing China School of Electrical and Electronic Engineering North China Electric Power University Changping 102206 Beijing China

ISBN: (纸本)9781424459407

A new method of power quality synthetic evaluation based on relative intensity entropy and local variable weight is presented in the paper. This method firstly uses the relative intensity entropy theory to extract the weights of the individual power quality indicators, and then does synthetic evaluation to the power quality data combined with the method of local state variable weight to amend the index weights, and gives the assessment point levels of their power quality. This new evaluation method embodies the gradual change of objective evaluation index weights with indicators values, and could do incentives and penalties to some weights of internal indicators. The simulation results show that the method proposed in this paper is more suitable for power quality evaluation, and has more practical significance. ©2010 IEEE.

关键词： power quality

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PCA fault location based on wide area measurement systems

PCA fault location based on wide area measurement systems

引用

International Conference on Critical Infrastructures, CRIS

作者： Yagang Zhang Zengping Wang Jinfang Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

The faults in electric power system can not be completely avoided. When power system operates from normal state to failure or abnormal operates, its electric quantities may change significantly. Our researches indicate that the variable with the biggest coefficient in principal component usually corresponds to the fault. Therefore, utilizing real-time measurements of PMU, basing on principal components analysis technology, we have completed the fault location of electric power system. Of course, because of the complexity of different types of faults in power system, there still exists enormous problems need a close and intensive study.

关键词： Principal component analysis Covariance matrix Fault location power system dynamics Eigenvalues and eigenfunctions Complexity theory

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Reliability evaluation for distribution system with distributed generators

Reliability evaluation for distribution system with distribu...

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International Conference on Critical Infrastructures, CRIS

作者： Yuqin Xu Yingchao Wu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

ISBN: (纸本)9781424480807

Distributed generator (DG), with its flexible power generation, environment-friendly advantages has been more widely used in distribution system, which has brought some influence to the traditional distribution network reliability evaluation. In this paper, two different models for conventional DG and wind turbine generator (WTG) are established for reliability evaluation, based on different energy sources and operation characteristics. This paper presents a technique to obtain the WTG output using statistical wind speed information, considering to the intermittent characteristics of wind power. On this basis, an improved minimal cut set algorithm is proposed to evaluate the reliability of distribution network with DG. Finally, the simulation of a typical distribution line with DG verifies the validity of this method.

关键词： Reliability power system reliability Indexes Wind speed power generation Generators

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New Technologies of Modular Multilevel Converter for VSC-HVDC Application

New Technologies of Modular Multilevel Converter for VSC-HVD...

引用

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

作者： Ke Li Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

This paper presents some new technologies of modular multilevel converter (MMC) for VSC-HVDC application. The origin of modular multilevel VSC and its essential working mechanism are clarified in detail. Then, the starting of MMC under de-energized condition is discussed and a simple but effective control scheme is proposed. Concerning the drawbacks of traditional PWM modulation technologies, i.e., SVPWM and SHPWM, an improved modulation control technology based on waveform approximation is presented. The proposed modulation technology makes the individual semiconductors have much lower switching frequency (50 Hz) resulting in lower switching losses and, consequently, lower total losses of the transmission system compared to 2 or 3-level VSC. The technologies and conclusions are validated by simulations in PSCAD/EMTDC. The theory analysis and simulation results indicate that these new technologies have great potentiality in the application of VSC-HVDC projects in future.

关键词： power conversion Voltage Space vector pulse width modulation Capacitors Clamps Semiconductor diodes Switching converters Educational technology Paper technology Switching frequency

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Prony analysis of electrical transient characteristics of AC system during HVDC commutation failure

Prony analysis of electrical transient characteristics of AC...

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International power Engineering Conference (IPEC)

作者： Rulian Zhang Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

With the development of High Voltage Direct Current (HVDC) transmission, the impact of DC system on AC relay protection becomes more prominent. So it becomes more important to research electrical characteristics of AC system under DC faults. In PSCAD/EMTDC environment, the inverter commutation failure resulted from short circuit faults in AC line is simulated based on the electromagnetic transient model of Shandong grid containing Ningdong-Shandong DC transmission system. Prony algorithm is applied to analyze the electrical transient characteristics of AC system during commutation failure. The coincidence of fitted waveform and simulated waveform verified the validity of prony algorithm. Prony analysis results show that DC system injects a large number of inter-harmonic components into the inverter side AC system during commutation failure, and the distortion of the parallel line current is more serious than that of the fault line current, so the impact of DC system on the AC relay protection devices equipped on the parallel line is greater.

关键词： HVDC transmission Algorithm design and analysis Transient analysis Harmonic analysis Inverters power system harmonics

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Application of Cooperative Game Analysis in Combination Evaluation of power Quality

Application of Cooperative Game Analysis in Combination Eval...

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2010年中国国际供电会议(CICED 2010)

作者： Guodong Li Gengyin Li Ming Zhou Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power UniversityChangping 102206BeijingChina

ISBN: (纸本)9781457700668

Cooperative game theory is firstly introduced into the comprehensive assessment of power quality,and a new model for combination evaluation of power quality is established based on cooperative game. The model takes into account the advantages of 4 kinds of single assessment method. By calculating the characteristic function values of various combinations to get the Shapley value of each assessment method,and then the weight value of each method in combination union can be determined,so that power quality assessment conclusion could be optimized. The conclusion also reflects the information of evaluation object from different angles. The simulation results show that the combination evaluation method with good accuracy can be effectively applied to the comprehensive assessment of power quality.

关键词： Combination evaluation comprehensive evaluation cooperative game power quality Shapley value

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Auxiliary frequency control of HVDC systems for wind power integration

Auxiliary frequency control of HVDC systems for wind power i...

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International Conference on Critical Infrastructures, CRIS

作者： Jing Hu Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing China

ISBN: (纸本)9781424480807

As a promising renewable resource, wind power is highly expected to contribute a significant part of generation in power systems in the future, but this also brings new integration related power quality issues due to its unconventional characteristics. To solve frequency fluctuating problems of wind power integration, this paper proposes an idea that it is possible and reasonable to use HVDC lines with auxiliary frequency control(AFC) to stabilize the frequency fluctuation caused by wind power, which could increase the rate of wind power integration not only, but also reduce intra-region reserve capacity and wind power cost. Furthermore, an improved frequency control strategy of HVDC is proposed. The simulation results show that the substitution of wind power frequency control reserves with the HVDC connection is possible without additional equipment and without causing large disturbances in both sides.

关键词： Frequency control Wind power generation HVDC transmission Fluctuations Inverters Rectifiers

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