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Zhang R.-G.,China Institute of Technology | Wang P.-P.,Zhengzhou University | Huang R.-C.,Xian Power Supply Bureau
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

In order to solve the problem of short-term load optimizing distribution in complex power system with more types of generating sets, this paper designs and develops an integrated software system named Short Load Optimizing Distribution System, whose core part is composed of one main program and four subroutines. In the design process, combining multiple operating conditions and complex constraint conditions and aiming at the least running cost, an integrated load optimizing distribution mathematical model is established and the core modules are developed which are composed of dynamic property analyzing module, data calculation forecasting module and short load optimizing module. Simulation results show that using this software can reduce the consumption of coal in thermal power sets and the consumption of water in conventional electricity sets, and increase the homeostasis efficiency in pumpped storage hydroplant sets. Source


Liu J.,Shaanxi Electrical Power Research Institute | Liu J.,Xian University of Science and Technology | Zhang Z.-H.,Shaanxi Electrical Power Research Institute | Zhang Z.-H.,Xian University of Science and Technology | And 2 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

To coordinate the relay protection with the distribution automation system (DAS), the probability and strategy of multi-grade protection are discussed. For time-grading cooperation depending on time delay, the approaches are divided into two classes according to different operation mechanisms, driving technology and fault detection algorithms. The centralized fault allocation and restoration modes based on relay protection and distribution automation are discussed. The setting principles of two-grade time-grading protection and three-grade time-grading protection are suggested. The hybrid approach of multi-grade protection and distribution automation system for centralized fault allocation and restoration is proposed. The way to combine multi-grade protection with voltage-time type feeder automation is suggested, which can avoid the whole feeder outage due to any fault on a branch. Examples are given to explain the proposed ideas. Source


Wang G.-Y.,Xian Xirui Protection and Control Co. | Han F.-L.,Xian University of Science and Technology | Gao L.,Xian Power Supply Bureau | Yun B.-J.,Xian Xirui Protection and Control Co. | And 3 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

This paper designs a ECVT based distributed network spare power automatic switching plan for single bus sectionalized system based on GOOSE network using IEC61850 standard and associated with the secondary characteristic of analog output of ECVT. It expatiates the principle of spare power automatic switching, the charging and discharging conditions, action logics and abnormal voltage loop in automatic switch of the incoming line switching and automatic switch of sectionalized switch respectively by using the configuration and scheme of bay level devices. The plan can simplify secondary cable wiring and economize bay level devices, also can be directly applied to IEC61850-based digital substation or switching station, and has certain practical value. Source


Han F.-L.,Xian University of Science and Technology | Huang R.-C.,Xian Power Supply Bureau | Zhang H.,Xian Xirui Protection and Control Co. | Yun B.-J.,Xian University of Science and Technology | Yun B.-J.,Xian Xirui Protection and Control Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

IEC61850 standard provides a means to implement the interoperability between intelligent electronic devices (IED) from different manufacturers and the systems seamless integration, but protection modeling of IEC61850 is incompatible with the practical engineering application. On the basis of introducing IEC61850 object-oriented modeling techniques and IED modeling ideas, this paper summarizes the encountered problems of the IED modeling in engineering application: soft plate modeling, logic node modeling, data expansion, GOOSE modeling and logical device modeling. Combining with National Grid's latest release "Technical Specifications of DL/T 860 in Engineering", some effective and feasible solutions have been proposed to solve these difficult problems, and a middle-voltage line protection model instance is given, which is able to meet the project needs of digital substation construction. Source


Zhu T.-X.,China Southern Power Grid Co. | Zhang M.,Xian Power Supply Bureau | Guo W.-M.,China Southern Power Grid Co. | He J.,China Southern Power Grid Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

Based on the HVDC transmission systems in CSG, such as the Tian-Guang HVDC system, which the design and manufacture were completed by foreigner thoroughly, and the ±800 kV Yun-Guang HVDC system, which homemade rate has reached sixty percent, the protection systems of converter transformers used in these HVDC projects are introduced, and some typical operational experiences such as the mis-action of the non-electric quantity protection, the affection of the inrush current and the cooperation with AC and DC protections are discussed. The analysis and the conclusions are valuable to improve the maintenance ability of HVDC system. Source

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