As an important tool of transmission system dispatching, the region-based method has just been introduced into distribution area with the ongoing smart distribution grid initiatives. First, a more accurate distribution system security region (DSSR) model is proposed. The proposed model is based on detailed feeder-interconnected topology, and both substation transformer and feeder N-1 contingencies are considered. Second, generic characteristics of DSSR are discussed and mathematically proved. That is, DSSR is a dense set of which boundary has no suspension and can be expressed by several union subsurfaces. Finally, the results from both a test case and a practical case demonstrate the effectiveness of the proposed modeling approach; the shape of DSSR is also illustrated by means of 2- and 3-dimensional visualization. Moreover, the DSSR-based assessment and control are preliminary illustrated to show the application of DSSR. The researches in this paper are fundamental work to develop new security region theory for future distribution systems.
With the deep development of clean heating in the north of China, distributed heat storage boiler is widely concerned as an important way of clean heating, which plays an important role in eliminating renewable energy and meeting the demand of residents' heating. It is a systematic project to eliminate and discard the light and wind from the distributed heat storage boiler, which involves many main bodies, such as power grid enterprises, heating enterprises, terminal users, renewable energy producers, etc., but the participation of all parties in the economic cost affects the promotion and effect of the spread of distributed heat storage boilers. Therefore, it is necessary to carry out the participation based on multi-party participation. The distributed thermal storage electric boiler is used to absorb the abandoned wind and discard light economy. In this paper, we summarize the typical business operating models, set up the economic cost analysis model of multi parties and take the method of combining qualitative and quantitative analysis to analyze the economy of the main participants, and finally give a typical example to analyze and evaluate the economy of all parties, which can provide references for clean heating price policy. 1
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