Dallı dağıtım şebekesi yük akışı çözüm metodları
Başlık çevirisi mevcut değil.
- Tez No: 66785
- Danışmanlar: DOÇ. DR. ADNAN KAYPMAZ
- Tez Türü: Yüksek Lisans
- Konular: Elektrik ve Elektronik Mühendisliği, Electrical and Electronics Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 1997
- Dil: Türkçe
- Üniversite: İstanbul Teknik Üniversitesi
- Enstitü: Fen Bilimleri Enstitüsü
- Ana Bilim Dalı: Elektrik-Elektronik Mühendisliği Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 71
Özet
ÖZET Bu tez çalışmasında dallı dağıtım şebekesine ait çeşitli yük akışı metodları incelenmiştir. Bu metodlar; yük modellerine göre sabit akımlar, sabit admitanslar ve sabit güçler olmak üzere şebekenin üç ayrı yük tipi için; yüklerin sabit akımlar ve sabit admitanslar olarak alındığı, bu sebeple lineer yük akış eşitliği içeren şebekelerde kullanılan iterasyonsuz düz çözüm, şebekede yüklerin sabit güçler olarak kabul edildiği modeller için ise Newton-Raphson ve Gauss-Siedel iteratif çözüm yöntemlerine içeren yük akış analizi metodlarıdır. Yük akış eşitliklerinin elde edilmesinde genel olarak hatların kapasitanslarını ve karşılıklı endüktanslarının ihmal edildiği, şebekede yüklerin dengeli olduğu hatlarda çap- razlaştırmanın yapıldığı kabul edilmiştir. Bununla beraber yüklerin sabit akımlar veya sabit admitanslar olarak alındığı yük modeli için tek fazlı, iki fazlı, üç fazlı hatlar ile tek fazlı, iki fazlı ve üç fazlı dengesiz yükleri ihtiva eden bir dağıtım şebekesinin yük akış eşitliklikleri oluşturulmuş ve çözüm metodu sunulmuştur. Bara yükleri sabit aktif ve reaktif yükler olarak verilmiş ana kol ile beraber yan kollar ve alt kollar içeren birradyal dağıtım şebekesi için iki ayrı matod ile yük akış programı yazılmış örnek 28 baralı bir şebeke için bu program çalıştırılmış yük akışı sonuç¬ ları elde edilmiştir.
Özet (Çeviri)
SUMMARY Introduction: Load flow is a very important and fundemental tool for the analysis of any power system and is used in the operational as well as planning stages. Certain applica- tions, particularly in distribution automations and optimizations of a power system, require repeated load flow solutions. in these applications it is very important to sol- ve the load flow problem as efficiently as posible. Since the invention and wide- speread use of digital computers, many methods for solving the load flow problem have been devoloped. Most of t he methods have grown up around transmission systems and, över the years, variations of the Nevvton method, have become the most vvidely used However for distribution system complexes which are mostly ra- dial in nature. These general purpose programmes are not normaly found suitable mainly because of the difficulties in convergence of the iterations and the large me- mory requirement of the computer. Not much work has been carried out on load flow analysis of distribution networks. Generally distribution netvvorks are radial and the R/X ratio is very high. For this rea- sion netvvorks are ill-conditioned, and conventional Newton Raphson and fast de- coupled load flow methods are in efficient in solving such netvvorks [1,2]. Many researchers have suggested modified versions of the conventional load flow solving ill-conditioned povver networks. Recently some researchers have paid much attention to obtaining solutions for radial distributions netvvorks [ 4, 5 ]. Kersting and mendive have presented a load flow technique based on the ladder netvvork theory [6]. Shir Mohammadi have presented a compansation based power flow method for weakly meshed distribution and transmission systems [ 7 ]. Baran and Wu and Chiang have obtained the load flow solution in a distribution system by iterative solu- tion of three fundemental equations representing real power, reactive and voltage magnitude [8,9]. Renato has proposed a method for obtaining the load flow solution of radial distribution networks. His technique seems to be quite promising because it solves for bus voltage magnitudes only [10]. Goswamİ and Basu have presented a ixdirect solution method for solving radial and meshed distribution networks [11]. Ho- wever, the main limitation of their method is that no node in the network is the junc- tion of more than three branches. Jasmond and Lee have proposed a new load flow method for obtaining the solution of the radial distribution netvvork using a single-line equivlent. in this thesis several solution algorithms for solving distribution power flow equati- ons are investigated. These proposed methods, for three different power loads mo- dels of network, constant current, constant admittance and constant power, are ba- sic solution and iterative solutions algoritms. The basic solution is uniterative tech- nique because of consisting linear equation. The other iterative solution technique is Newton Raphson ör Gauss Siedal iterative methods because of consisting non- linear equations. in obtaining of power flow equation, generally capacitance and mutual inductance of lines are neglected. Loads is balanced and each phase in- ductance is equal. in addition for any given constant current ör admittance load mo¬ del, radial distribution network consist of single, double and three phases line ör lo¬ ads, power flow equations and solutions methods are obtained. There are many kinds of power flow methods. Ali methods are based on backvvard orforward svveep method. For this reason the formulation and presentation of the proposed algorithms highlight the fact that these methods can be viewed as Newton methods and the backvvard, forvvard sweep methods based on Siedal iterativ method. They are based on updating voltages, currents, (ör power flows) along the paths from the and buses to source ör from the source bus to the end buses. The technique of ali these proposed methods are nearly sensitive to correctly indexing laterals ör buses. Solution methodology: A-) Loads are constant power: Power flow equations for distribution system are usually modelled differently from transmission systems. To simplify the presentation, the system is assumed to be a balanced three phase system. For presentational convenience firstly a special case where there is only öne main feder is considered. The general case for any distri¬ bution system is considered next. A piece of line (branch) between two buses of xRadial Distrubution netvvorks, branch flow eguation used in iterative solution techni- gue from below figüre. following equations can be written. 1 i i+1NB Substation ||Lj-* PL(i+1), QL(i+1) PL(NB), QL(NB) I/İN _ |V(i+1)k5(i)-|V(i+1)|ZS(i+1) 'U>> -R(İ)+JX(İ)ı P(i+1)-jQ(i+1)=V*(i+1).l(i)2 From eqns. 1 and 2, we have |V(i+1)|={[(P(i+1)R(i)+Q(i+1)X(i)-0.5|V(i)|2)2-(R2(i)+X2(i))(P2(i+1)+Q2(i+1))]1/2 - P(i+1 )R(i)+Q(i+1 )X(i)-0.5|V(i)|2}1/23 Eqn.3 is a recursive relation of voltage magnitude. Since the substation voltage |V(i)| is known, it is possible to find out the voltage magnitude of ali other nodes. The real and reactive power in used eqn.3 can be written in generalised form NBNB-1 P(i+1)= E PL(j)+ E LPÛ) j=l+1J=H-1 NBNB-1 Q(i+1)= E QLO)+ E LQö) for 1=1,2NB-2 4 j=i+1j=i+1 and the real and reactive power losses in branch (i) can be written in generalised form _ R(')(P2(Hi)+Q2(i+i)) X(i)fp2(i+1)+Q2(i+1)) LQ
Benzer Tezler
- Flexible load management in active distribution system
Esnek dağıtım sistemlerinde yük yönetimi
SHAHRAM PARCHEHBAF DIBAZARI
Yüksek Lisans
İngilizce
2020
Elektrik ve Elektronik Mühendisliğiİstanbul Teknik ÜniversitesiElektrik Mühendisliği Ana Bilim Dalı
PROF. DR. BELGİN TÜRKAY
- Advanced evolutionary computation for distributionsystem automation
Dağıtım şebekesi otomasyonu için gelişmiş evrimsel algoritmalar
BAHMAN AHMADI
Yüksek Lisans
İngilizce
2021
Elektrik ve Elektronik Mühendisliğiİstanbul Teknik ÜniversitesiElektrik Mühendisliği Ana Bilim Dalı
PROF. DR. AYDOĞAN ÖZDEMİR
DR. ÖĞR. ÜYESİ OGUZHAN CEYLAN
- Parallel evolutionary computation for distribution system planning and operation
Dağıtım şebekesi planlama ve işletmesi için paralel evrimsel algoritmalar
SOHEIL YOUNESI
Yüksek Lisans
İngilizce
2022
Elektrik ve Elektronik Mühendisliğiİstanbul Teknik ÜniversitesiElektrik Mühendisliği Ana Bilim Dalı
PROF. DR. AYDOĞAN ÖZDEMİR
DR. ÖĞR. ÜYESİ OGUZHAN CEYLAN
- Mobil batarya enerji depolama sistemleri kullanılarak dağıtım sistemi işletiminin iyileştirilmesi ve sistem üzerindeki etkilerinin analizi
Improvement of distribution system operating using mobile battery energy storage systems and analysis of its effects on the system
OĞUZHAN KARAHAN
Yüksek Lisans
Türkçe
2021
Elektrik ve Elektronik Mühendisliğiİstanbul Teknik ÜniversitesiElektrik Mühendisliği Ana Bilim Dalı
PROF. DR. MUSTAFA BAĞRIYANIK
- Newton-Raphson based load flow analysis of AC/DC distribution systems with distributed generation
Dağıtık üretimli AA/DA dağıtım sistemlerinin Newton-Raphson tabanlı yük akışı analizi
FERHAT EMRE KAYA
Yüksek Lisans
İngilizce
2019
Elektrik ve Elektronik MühendisliğiOrta Doğu Teknik ÜniversitesiElektrik-Elektronik Mühendisliği Ana Bilim Dalı
PROF. DR. ALİ NEZİH GÜVEN