Service reliability evaluation of regional distribution networks using theAHPmethod

2014 ◽  
pp. 267-274
Keyword(s):  
Regional Distribution ◽  
Distribution Networks ◽  
Reliability Evaluation ◽  
Service Reliability

scholarly journals Research on Flexible Reliability Evaluation of Distribution Network System with Distributed Energy Access

2020 ◽  
Vol 213 ◽  
pp. 02033
Author(s):  
Zhihong Gu ◽  
Wei Wen ◽  
Zhuo Liu
Keyword(s):  
Distribution Network ◽  
Regional Distribution ◽  
Principal Component ◽  
Fuzzy Comprehensive Evaluation ◽  
Distribution Networks ◽  
Reliability Evaluation ◽  
Evaluation Index System ◽  
Three Dimensions ◽  
Energy Access ◽  
Distributed Energy

Access to distributed energy has brought a greater impact on the system. By analyzing the flexibility of the distribution network itself, considering the evaluation indicators of the three dimensions of effect, degree and service, this paper designs a flexible reliability evaluation index system for the distribution network, using principal component analysis and multi-level fuzzy comprehensive evaluation thoughts, a flexible reliability model was established, and calculation examples were analyzed, which is helpful to provide guidance for the development of regional distribution networks.

scholarly journals Aztec and Tlaxcalan Economic Interaction: Blockade or Interregional Exchange?

2021 ◽  
pp. 1-18
Author(s):  
Bianca L. Gentil ◽  
A. Gabriel Vicencio Castellanos ◽  
Kenneth G. Hirth
Keyword(s):  
Regional Distribution ◽  
Distribution Networks ◽  
Postclassic Period ◽  
Regional Trade ◽  
Trade Patterns ◽  
Lithic Tools ◽  
Economic Interaction ◽  
Late Postclassic ◽  
Large Center ◽  
The Impact

This study investigates the impact of the Aztec Triple Alliance on trade and economic activity in the region of Puebla-Tlaxcala during the Late Postclassic period (AD 1200–1519). Ethnohistorical sources describe the Aztec Triple Alliance as constantly at war with settlements in the Tlaxcala region. To weaken their Tlaxcalteca rivals, the Aztecs imposed a trade blockade to reduce the flow of resources into Puebla-Tlaxcala. This article uses archaeological evidence to evaluate the effectiveness of this blockade. It compares the types of obsidian used to manufacture lithic tools from Aztec-controlled sources with those used within Puebla-Tlaxcala. Information from the large center of Tepeticpac and the small obsidian workshop site of Cinco Santos II, both in the Tlaxcala domain, are compared to other sites in Central Mexico prior to and during the height of Aztec influence. The results show little difference in regional trade patterns: obsidian from Sierra de las Navajas and Otumba was used in proportions in the Tlaxcala region in the Late Postclassic similar to those used during earlier periods. If an embargo was attempted, it was largely unsuccessful in isolating Tlaxcala from broader regional distribution networks.

scholarly journals Research and Application of a Clear Diamond-Shaped Distribution Network Structure

2021 ◽  
Vol 9 ◽  
Author(s):  
Liu Shengli ◽  
Wu Jun ◽  
Xue Longjiang ◽  
Wu Di ◽  
Lu Haiqing ◽  
...  
Keyword(s):  
Network Structure ◽  
Power Supply ◽  
Distribution Network ◽  
Regional Distribution ◽  
Distribution Networks ◽  
Ring Network ◽  
Medium Voltage ◽  
Double Ring ◽  
Diamond Type ◽  
Supply Reliability

Aiming at the problems of low power supply reliability, poor transfer capacity between stations, and low line utilization in the current distribution network, this paper proposes a diamond-shaped distribution network structure with a clear structure. First, we investigated the typical wiring patterns of medium-voltage distribution networks in Tokyo, Japan, Paris, France, and China’s developed cities, and summarized experience and shortcomings. Secondly, combining the typical wiring patterns of distribution networks in China and abroad, construct a diamond-shaped distribution network structure, and study its adaptability, safety and flexibility, power supply reliability, and economy. Finally, take the transformation of the wiring mode of a regional distribution network in a certain city as an example, compare the use of the diamond-shaped distribution network structure in this article with the use of cable double-ring network wiring, cable “double petal” wiring, and Shanghai diamond-type wiring distribution network grid reconstruction The effect verifies the superiority of the diamond-shaped distribution network structure in this paper.

Research on Reactive Power and Voltage Optimization of Regional Distribution Network

2011 ◽  
Vol 58-60 ◽  
pp. 474-479
Author(s):  
Yu Du
Keyword(s):  
Reactive Power ◽  
Regional Distribution ◽  
Distribution Networks ◽  
Radiation Characteristic ◽  
Reactive Power Optimization ◽  
Voltage Level ◽  
Medium Voltage ◽  
Regulation Effect ◽  
Practical Operation ◽  
Transformer Taps

The high-medium voltage level distribution networks have their own characters. Because of the radiation characteristic of the network, this paper looks on the network as the combination of some small optimization unit. The paper simplifies the resolution of the reactive power optimization by the way of alternatively solving the adjusting transformer taps and switching capacity banks. At the same time, considering the practical operation request, the paper evaluates the regulation effect and improves the practicability of the software.

Uncertainty quantification of pressure-driven analysis for water distribution network modeling

2015 ◽  
Vol 16 (3) ◽  
pp. 599-610 ◽  
Author(s):  
Ho Min Lee ◽  
Do Guen Yoo ◽  
Doosun Kang ◽  
Hwandon Jun ◽  
Joong Hoon Kim
Keyword(s):  
Negative Pressure ◽  
Water Distribution ◽  
Real Life ◽  
Water Distribution Network ◽  
Distribution Networks ◽  
Operating Conditions ◽  
Service Reliability ◽  
High Degree ◽  
Pressure Driven Analysis ◽  
Pressure Driven

The hydraulic analysis of water distribution networks (WDNs) is divided into two approaches: namely, a demand-driven analysis (DDA) and a pressure-driven analysis (PDA). In the DDA, the basic assumption is that the nodal demand is fully supplied irrespective of the nodal pressure, which is mainly suitable for normal operating conditions. However, in abnormal conditions, such as pipe failures or unexpected increase in demand, the DDA approach may cause unrealistic results, such as negative pressure. To address the shortcomings of DDA, PDA has been considered in a number of studies. For PDA, however, the head-outflow relation (HOR) should be given, which is known to contain a high degree of uncertainty. Here, the DDA-based simulator, EPANET2 was modified to develop a PDA model simulating pressure deficient conditions and a Monte Carlo simulation (MCS) was performed to consider the quantitative uncertainty in HOR. The developed PDA model was applied to two networks (a well-known benchmark system and a real-life WDN) and the results showed that the proposed model is superior to other reported models when dealing with negative pressure under abnormal conditions. In addition, the MCS-based sensitivity analysis presents the ranges of pressure and available discharge, quantifying service reliability of water networks.

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