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Li P.,North China Electrical Power University | Yang S.,North China Electrical Power University | Wang Y.,Yangzhou Power Supply Company | Yin Z.,North China Electrical Power University
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2014

Microgrid, which is an effective and feasible approach for scale application of new energy and renewable energy generation, integrates effectively the advantages of the distributed new energy and renewable energy generation. The various running modes and excellent electricity services of microgrid depend on the flexible and steady control frame, while the independent control of micro source active power output and reactive power output is a burning question. Considering the problem of power coupling, which was brought by the lines characteristics, a method of objective function diagonalization decoupling control of microgrid power based on relative gain analysis was proposed. Relative gain analysis was introduced for matching selection of power model of low voltage microgrid, which quantified the channel coupling degree. Based on this, the objective function diagonalization method was applied for power decoupling control. Finally, independent active and reactive power control of microgrid was realized. The simulation results show that the proposed decoupling method effectively eliminates the power coupling in microgrid and realizes the independent and flexible regulation of the microgrid active and reactive power. © 2014 Chinese Society for Electrical Engineering. Source

Yao N.,Jiangsu Electric Power Company | Wang K.,Yangzhou Power Supply Company | Yu J.,Nanjing University
Computer Modelling and New Technologies | Year: 2014

The development and application of computer graphic design and visual communication design greatly changes people's life. Designers can use design tools, which are highly-advanced and professional to create a broader scope of design and design theme works. In our daily life, computer graphics technology is widely applied into various fields, such as the military, medical, communication, art etc. Computer graphics and image technology has been emphasized in the visual field, which improves the overall effect and the level of visual communication design to a large extent. This article mentioned the definition of the technology of computer graphics and the visual communication, then described the significance of realizing the visual communication design elements, and hoped the results will be helpful to relative fields. Source

Chen Q.,Jiangsu Electric Power Company | Deng J.,Jiangsu Electric Power Company | Pan J.,Jiangsu Electric Power Company | Fan Y.,Yangzhou Power Supply Company
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2015

Inner-bridge configuration is a kind of main electrical connection widely used in 110 kV substations. This paper describes the protection action process during a circuit breaker fault on the low voltage side of the main transformer in a 110 kV substation with inner-bridge configuration. The long-term overheat made the button contact of the low voltage side circuit breaker of the transformer lose its elasticity. The contact fall off caused an interphase short circuit. Since the high voltage side back-up protection of the transformer failed to operate, the line protection and recloser of the superior 220 kV substation acted. And automatic switchover acted irrationally while the backup line put in. The circuit breaker was damaged by the rush more than once until the substation lost power. The fault is to a certain extent typical of a power system with problems in the design of its protection configuration. An overall analysis is made by the authors on the protection action process of the fault alongside suggestions and countermeasures for optimizing main protection configuration and setting, as well as operation and maintenance of inner-bridge configuration. ©2015 State Grid Electric Power Research Institute Press Source

Gao L.,Jiangsu Electric Power Company | Shi H.,Yangzhou Power Supply Company | Yang Y.,Jiangsu Electric Power Company | Cao W.,Nanjing Five C Smart Power Grid Technology Co.
Dianwang Jishu/Power System Technology | Year: 2014

The validity of substation configuration description (SCD) file is of crucial importance to the secure operation of the smart substation, especially the virtual terminal and the connection of virtual terminals relate to the tripping and sampling circuits of intelligent electronic devices (IED). The manage and control approach for the configuration file of smart substation is researched, and the management and control process of SCD files and corresponding technical means are expounded and the overall architecture and the construction of configuration file management and control system are presented. Using configuration file management and control system, the centralized management of SCD files of multi smart substations within the region can be implemented, in which a series management functions such as the file upload, storage, verification, comparison, visual display and the version tracing and so on are provided to conduct real-time supervision and control to ensure the safety, integrity and consistency of SCD files. ©, 2014, Power System Technology Press. All right reserved. Source

Ying Z.,Nanjing University of Science and Technology | Chen Y.,Nanjing University of Science and Technology | Tian Y.,Yangzhou Power Supply Company | Wu J.,Nanjing University of Science and Technology | Feng K.,Nanjing University of Science and Technology
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2013

The frequency detection reliability of active frequency shift method is easily influenced by the grid interferences, which may be wrongly taken as the occurrence islanding effect. The anti-interference six-point frequency detection algorithm is adopted in the active frequency shift method to avoid such misjudgement and quickly detect islanding, which applies the optimal interval of detection point and eliminates the frequency singularity to suppress the grid interference. The simulative research of islanding detection is performed according to the worst conditions stipulated by IEEE Std929-2000 and results show that, with fast response, the proposed method prevents the misjudgement and has no nondetection zone. Source

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