The approach to planning, design and operation of distribution networks have significantly changed due the proliferation distributed energy resources (DERs) together with load growth, storage technology advancements increased consumer expectations. Planning active systems (ADS) has been a very hot topic in 21st Century. A large number studies done on ADS planning. This paper reviews state art current Firstly, influences DERs planning are addressed. Secondly, characteristics objectives...

Power transformers are of vital importance for the stable operation power system. Hence, to grasp transformers' health condition is imminent importance. However, evaluation bound with fuzzy, uncertainty, and even conflict information. To address these problems, a novel model transformer, by integrating merits fuzzy set theory, analytical hierarchical process (AHP), modified weighted averaging combination, proposed in this study. The contains four factors: dissolved gas analysis, electrical...

The power transformer is one of the most critical and expensive components for stable operation system. Hence, how to obtain health condition great importance utilities. Multi-attribute decision-making (MADM), due its ability solving multi-source information problems, has become a quite effective tool evaluate transformers. Currently, analytic hierarchy process (AHP) Dempster–Shafer theory are two popular methods solve MADM problems; however, these techniques rarely consider one-sidedness...

Overhead lines are important parts of distribution networks at present. Assessment and prediction their health status is great significance to ensure the reliable operation network. This paper presents a method for assessing predicting overhead based on index (HI). First, key features set including ontological nonontological factors determined. Then, calculation evaluating HI analytic hierarchy process technique order preference by similarity an ideal solution proposed. Subsequently,...

The single-phase-to-ground fault (SPGF) affects the reliability and security of distribution system greatly. Accurate online recognition causes can help improve efficiency weak components finding maintenance. In this article, various symptom features SPGF by typical are analyzed a fuzzy inference (FIS) for cause is established overhead lines in nonsolidly earthed networks. Based on survey certain city China, artificial grounding experiments designed six causes, including arrester breakdown,...

As in some studies the SHED was selected as test equipment to collect and measure non-exhaust particles produced by vehicle, flow field distribution of calculated analyzed through CFD simulation. The collection rate that could be collected at sample port studied. results show particulate matter is distributed a flocculent manner SHED. Affected wind speed set SHED, large front vehicle leads faster diffusion accumulation rear With increase fan, gradually uniform. After ejecting from where tire...

The complexity and diversity of noise in corona current measurements high-voltage direct (HVdc) transmission lines leads to challenges estimating performance. This paper proposes an offline suppression method for HVdc measurements. Given that the background processes coexist within same frequency band, we develop a novel multifaceted filtering approach currents. Specifically, cross correlation function-based center recognition is presented provide filter design specification multiple notch...

In nonsolidly earthed distribution networks, single-phase-to-ground faults (SPGFs) significantly threaten the safety of people and equipment. Although selection location techniques for existing fault lines have made remarkable contributions in reducing damage due to SPGFs, a certain amount power loss still exists SPGF owing its low efficiency detection maintenance. Multiple-dimensional classification May help reveal nature from different perspectives; therefore, this article, multilabel...

The health status of distribution equipment and networks is not considered directly in existing network planning methods. In order to effectively consider the deal with risk associated load renewable generation uncertainties, this paper presents a new optimal expansion approach for (EPADN) incorporating equipment's index (HI) non-network solutions (NNSs). HI relevant are used help develop replacement strategy temporary NNSs as promising options handling uncertainties growth, reliability...

In 2015, China National Energy Administration announced an action plan of 2 trillion yuan ($3225.8 billion) investment for power distribution network the coming 5 years. The intent is to upgrade and modernise meet multidimensional requirements, including distributed energy resources, high levels security, quality efficiency supply, requests CO2 reduction. A systematic, effective reform would best be based on comprehensive evaluation performance. However, in literature, previous works...

An optimum design method, which is based on the interruption model of molded case circuit breaker (MCCB), proposed for cam structure. First, it constructs a multifield coupled calculation that enables us to simulate process MCCB. The carries out second development Automatic Dynamic Analysis Mechanical Systems (ADAMS) and set differential equations describing coupling air blast with complex mechanical movement, electric circuit, magnetic field, dynamic arc model. With this model,...

As the network end of power transmission, distribution (DN) directly determines reliability electricity energy supply. To predict failure accurately is important for increasing repair efficiency DN. Based on data from DN in Beijing, paper researches short-term failures prediction and proposes a fault judgment program based weather season factors. Failure analyzed to determine its most Through support vector machine (SVM) algorithm considering relative meteorological factors, using...

In this paper, a novel data classification approach is proposed based on integration of regularized extreme learning machine and Symbiotic Organisms Search (SOS). order to simplified the description, new method named as Sos-RELM, which mainly contains two phases. As known, in compared with traditional paths, such SVM, LS-SVM BP, expresses its excellent ability term accuracy computing time. Hence, first phase, we utilize regularised goal that output weights can be rapidly calculated. one...

Metros are mass rapid-transit systems that have helped solve commuting problems for residents of metropolises throughout the world. However, adverse geological structures, leading to problem such as water inrush and mud gushing, pose a major threat metro construction. Geophysical survey techniques provide quick relatively inexpensive ways detect structures ahead tunnel face. Left line R3 in Qingdao, China will pass an aquifer sand layer under Wolong River. To map conditions below river, we...

70-80% of product quality is determined in the concept design process, stage has become ¿bottleneck¿ lifecycle control. Taguchi method an effective control approach, its focuses are on parameter and tolerance design, there short technique solution for system design. In this paper, based axiom axiomatic (AD) to contradictions theory inventive problem solving (TRIZ), a technical framework put forward. The component evaluation scheme AD flow latent TRIZ, thus it can identify solve coupling...

The Single-phase-to-ground fault (SPGF) affects reliability and safety of distribution system greatly. Accurate online recognition causes can help find weak components in time improve maintenance efficiency. A fuzzy inference typical cause SPGFs is proposed for overhead lines non-solidly earthed networks. Based on the survey a certain city China, artificial grounding experiments are designed six causes, including arrester breakdown, insulator flashover, line-to-crossbar discharge, line...

(2007). Between Heaven and Modernity: Reconstructing Suzhou, 1895-1937. The Chinese Historical Review: Vol. 14, No. 1, pp. 150-152.