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This paper observes the boundary of distribution system security region (DSSR). DSSR is defined as a set of all the operating points satisfying N-1 security constraints. First, the basic concepts of N-1 security are introduced for distribution system under smart grid background. Then, the dividing phenomenon of operating points security is reported, which indicates that DSSR boundary of a given distribution...
This paper proposes a new concept of loadability for interconnected distribution systems, in which feeders are connected with normally-open tie-switches and the N-1 security principle is applied. Firstly, this paper presents a nonlinear model to formulate the N-1 loadability, in which network topology, thermal rating of lines and substation transformers, voltage limits and losses are considered. Secondly,...
In this paper, a new Distribution Management System (DMS) based on security region is proposed. First, the model and topological characteristics of Distribution System Security Region (DSSR) are both introduced. This new theoretic tool provides a chance to implement real-time security analysis and control for distribution systems. Second, this paper proposes and describes five security states for...
The Total Supply Capability (TSC) model is newly proposed to evaluate the maximum load a distribution system can supply under the N-1 security guideline. This TSC model and a linear programming algorithm can calculate the accurate TSC of a distribution system; but the results of transformer loading rates calculated by this model are usually unbalanced, which is unacceptable in the practical operation...
This paper proposes the definition, model and algorithm of two quantitative indices named the Total Supply Capability (TSC) and Ideal Total Supply Capability (ITSC) for distribution planning. The TSC of a distribution system is comparable to Total Transfer Capability (TTC) in transmission systems, which is defined as the maximum load it can serve under the N-1 guideline for distribution systems, taking...
The computer-supported decision-making system has become an essential tool for the sustainable growth and expansion planning of modern urban power distribution network. Current packages with planning functions are independent packages, which are limited in the academic research. Presently, in Shanghai Municipal Electric Power Company and its subordinate units, a geographic information system(GIS)-based...
Based on the basic concepts and analysis methods of power supply capability, the paper analyzed the increase of distribution network efficiency in parallel operation. Firstly, the analysis process and formulas of the power supply capacity in parallel operation under general connection mode was given. And then the hand-in-hand connection mode was adopted as the specific network connection mode. The...
A proper evaluation on the power supply capability of urban distribution system is of enormous social and economical significance. In competitive marketing environment, to satisfy the sustainable growth of distribution loads, electric utilities must judge whether the return of power supply capability is sustainable and valued against the certain amount of investment. Therefore, to make up the insufficiency...
To adapt the needs of the rapid development and more frequent construction or reconstruction of urban distribution network in China, this paper proposes a comprehensive computer-supported planning software system, which is called planning platform. It is different from the traditional decision-making system which only plays a role as an analysis and decision-making support tool for planning engineers...
According to the operational features of distribution network, the paper presents a method to calculate the distribution system reliability that also considers multi-layers failure. Based on the regular reliability calculation, the results are promoted. Firstly, the distribution system is divided into different parts by different voltage level. Secondly, based on the characteristics of the distribution...
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