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1、Power Supply and Distribution System ABSTRACT: The basic function of the electric power system is to transport the el ectric power towards customers. The l0kV electric distribution net is a key point that connects the power supply with the electricity usin g on the industry, business and daily-life.
2、 For the electric power, allc ostumers expect to pay the lowest price for the highest reliability, b ut dont consider that its self-contradictory in the co-existence of ec onomy and reliable.To improve the reliability of the power supply n etwork, we must increase the investment cost of the network
3、constr uction But, if the cost that improve the reliability of the network con struction, but the investment on this kind of construction would be worthless if the reducing loss is on the power-off is less than the inc reasing investment on improving the reliability .Thus we find out a b alance poin
4、t to make the most economic,between the investment a nd the loss by calculating the investment on power net and the loss brought from power-off. KEYWORDS: power supply and distribution, power distribution reliability ， reactive compensation, load distribution The revolution of electric power system
5、has brought a new big roun d construction,which is pushing the greater revolution of electric po wer technique along with the application of new technique and adv anced equipment. Especially, the combination of the information te chnique and electric power technique, to great ex- tent, has improv ed
6、 reliability on electric quality and electric supply. The technical de velopment decreases the cost on electric construction and drives in novation of electric network. On the basis of national and internatio - nal advanced electric knowledge, the dissertation introduces the r esearch hotspot for pr
7、esent electric power sy- etem as following. Firstly, This dissertation introduces the building condition of distribu tion automation(DA), and brings forward two typical construction m odes on DA construction, integrative mode and fission mode .It emp hasize the DA structure under the condition of th
8、e fission mode and presents the system configuration, the main station scheme, the fe eder scheme, the optimized communication scheme etc., which is f or DA research reference. Secondly, as for the (DA) trouble measurement, position, isolation a nd resume, This dissertation analyzes the changes of p
9、ressure and c urrent for line problem, gets math equation by educing phase short circuit and problem position under the condition of single-phase an d works out equation and several parameter s U& , s I& and e I& tab le on problem . It brings out optimized isolation and resume plan, re alizes auto i
10、solation and network reconstruction, reduces the power off range and time and improves the reliability of electric power su pply through problem self- diagnoses and self-analysis. It also introd uces software flow and use for problem judgement and sets a mode l on network reconstruction and computer
11、 flow. Thirdly, electricity system state is estimated to be one of the key tec hniques in DA realization. The dissertation recommends the resolve nt of bad measurement data and structure mistake on the ground of describing state estimate way. It also advances a practical test and j udging way on top
12、ology mistake in state estimate about bad data te st and abnormity in state estimate as well as the problem and effect on bad data from state measure to state estimate .As for real time monitor and control problem, the dissertation introduces a new wa y to solve them by electricity break and excepti
13、onal analysis, and th e way has been tested in Weifang DA. Fourthly, about the difficulty for building the model of load forecasti ng, big parameter scatter limit and something concerned, the disser tation introduces some parameters, eg. weather factor, date type an d social environment effect based
14、 on analysis of routine load foreca sting and means. It presents the way for electricity load forecasting f ounded on neural network(ANN),which has been tested it s validity by example and made to be good practical effect. Fifthly, concerning the lack of concordant wave on preve nting conc ordant wa
15、ve and non-power compensation and non-continuity on c ompensation, there is a topology structure of PWM main circuit and nonpower theory on active filter the waves technique and builds fla t proof on the ground of Saber Designer and proves to be practical. Meanwhile, it analyzes and designs the way
16、of non-power need of e lectric network tre- nds and decreasing line loss combined with DA, which have been tested its objective economic benefit throu- gh co unting example. Sixthly, not only do the dissertation design a way founded on the m agrginal electric price fitted to our present national ele
17、ctric power market with regards to future trends of electric power market in Chi na and fair trade under the government surveillance, that is group c ompetitio n in short-term trade under the way of grouped price and quantity harmony, but also puts forward combination arithmetic, m ath model of trad
18、ing plan and safty economical restriction. It can sol ve the original contradiction between medium and long term contra ct price and short term competitive price with improvement on com petitive percentage and cut down the unfair income difference of el ectric factory, at the same time, it can optim
19、ize the electric limit for all electric factories and reduce the total purchase charge of electric power from burthen curve of whole electric market network. The distribution network is an important link among the power syst em. Its neutral grounding mode and operation connects security an d stabili
20、ty of the power system directly. At the same time, the probl em about neutral grounding is associated with national conditions, natural environment, device fabrication and operation. For example, the activity situation of the thunder and lightning, insulating struct ure and the peripheral interferen
21、ce will influence the choice of neut ral grounding mode Conversely, neutral grounding mode affects desi gn, operation, debugs and developing. Generally in the system high er in grade in the voltage, the insulating expenses account for more sizable proportion at the total price of the equipment. It i
22、s very rem arkable to bring the economic benefits by reducing the insulating le vel. Usually such system adopt the neutral directly grounding and ad opt the autoreclosing to guarantee power supply reliability. On the c ontrary, the system which is lower in the voltage adopts neutral non e grounding
23、to raise power supply reliability. So it is an important su bject to make use of new- type earth device to apply to the distribut ion network under considering the situation in such factors of vario us fields as power supply reliability, safety factor, over-voltage factor, the choice of relay protec
24、tion, investment cost, etc. The main work of this paper is to research and choice the neutral gr ounding mode of the l0kV distribution network. The neutral groundi ng mode of the l0kV network mainly adopts none grounding, groun ding by arc suppressing coil, grounding by reactance grounding and direc
25、tly grounding. The best grounding mode is confirmed through t he technology comparison. It can help the network run in safety and limit the earth electric arc by using auto-tracking compensate devic e and using the line protection with the detection of the sensitive s mall ground current. The paper
26、introduces and analyzes the charact eristic of all kind of grounding modes about l0kV network at first. Wi th the comparison with technological and economy, the conclusion i s drawn that the improved arc suppressing coil grounding mode sho ws a very big development potential. Then, this paper resear
27、ches and introduces some operation charact eristics of the arc suppressing coil grounding mode of the l0kV distri bution network. And then the paper put emphasis on how to exting uish the earth electric arc effectively by utilizing the resonance princ iple. This paper combines the development of dom
28、estic and interna tional technology and innovative achievement, and introduces the c omputer earth protection and autotracking compensate device. It p roves that the improved arc suppressing coil grounding mode have better operation characteristics in power supply reliability, personal security, sec
29、urity of equipment and interference of communication. The application of the arc suppressing coil grounding mode is also re searched in this paper. Finally, the paper summarizes this topic research. As a result of the domination of the arc suppressing coil grounding mode, it should be more populariz
30、ed and applied in the distribution network in the fut ure.The way of thinking, project and conclusions in this thesis have e ffect on the research to choose the neutral grounding mode not onl y in I0kV distribution network but also in other power system. The basic function of the electric power syst
31、em is to transport the el ectric power towards customers. The l0kV electric distribution net is a key point that connects the power supply with the electricity usin g on the industry, business and daily-life. For the electric power, all c ostumers expect to pay the lowest price for the highest relia
32、bility, b ut dont consider that its self-contradictory in the co-existence of ec onomy and reliable. To improve the reliability of the power supply n etwork, we must increase the investment cost of the network con- s truction But, if the cost that improve the reliability of the network c onstruction
33、, but the investment on this kind of construction would be worthless if the reducing loss is on the power-off is less than the increasing investment on improving the reliability .Thus we find out a balance point to make the most economic, between the investme nt and the loss by calculating the inves
34、tment on power net and the l oss brought from power-off. The thesis analyses on the economic an d the reliable of the various line modes, according to the characteris tics various line modes existed in the electric distribution net in fosh an. First, the thesis introduces as the different line modes
35、 in the l0kV el ectric distribution net and in some foreign countries. Making it clear tow to conduct analyzing on the line mode of the electric distributi on net, and telling us how important and necessary that analyses ar e. Second, it turns to the necessity of calculating the number of optimi zat
36、ion subsection, elaborating how it influences on the economy an d reliability. Then by building up the calculation mode of the numbe r of optimization subsection it introduces different power supply pr ojects on the different line modes in brief. Third, it carries on the cal culation and analyses to
37、wards the reliability and economy of the diff erent line modes of electric distribution net, describing drafts accor ding by the calculation. Then it makes analysis and discussion on the number of optimization subsection. At last, the article make conclusion on the economy and reliability o f differ
38、ent line modes, as well as, its application situation. Accordion to the actual circumstance, the thesis puts forward the beneficial s uggestion on the programming and construction of the l0kV electric distribution net in all areas in foshan. Providing the basic theories a nd beneficial guideline for the programming design of the 10kV elec tric distribution net and building up a solid net, reasonable layout, q ualified safe and efficiently-worked electric distribution net.