Enerji iletim hatlarında çalışma bölgelerinin sınırlayıcı etkilerle incelenmesi
The Study of the effects of constraint operational quantities on capability charts
- Tez No: 66493
- Danışmanlar: PROF. DR. H. NUSRET YÜKSELER
- 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: 204
Özet
The different operation, conditions will absolutely cause the different results to emerge. As a result of this, the good idea is that the Keban-Kayseri-Gölbaşı transmission line is examined for the different operation conditions. In the work done here, to see the differences between these different operation conditions, six different possible conditions of operation of the Keban-Kayseri-Gölbaşı transmission line are chosen. According to these six different operation modes, the operation regions are examined one by one. To reach the result, firstly, for each mode, the generalized circuit constants AJB,C and D are calculated. Then, for each mode, to examine the static voltage stability, the P - V curves are drawn for the receiving end by keeping the sending end voltage constant, here 380 kV line-to-line. The detailed figure that can be interpreted as a equivalent circuit of the sample line is given in Figure 2. Keban Kayseri Gölbaşı Fig. 2 The Equivalent Circuit of The Keban-Kayseri-Gölbaşı Transmission Line. xxu
Özet (Çeviri)
SUMMARY THE STÜDY OF THE EFFECTS OF CONSTRAINT OPERATIONAL QUANTITIES ON CAPABILITY CHARTS The aim of this thesis is to examine the effects of constraint operational guantities on capability charts. To reach the aim of this thesis, the static load voltage stability is anatyzed. in this thesis, for the realisation of the anatysis, two bus three phase power transmission line Keban-Kayseri-Gölbaşı has been chosen as a sample. This sample transmission line with 380 kV line-to-line base voltage consists of two parallel lines. The sample transmission line is'given in Figüre l. KG l o“ o ±yTl g ”s Fiğ. l Öne Line Diagram of Keban-Gölbaşı Transmission Line. The Keban-Kayseri part of the line is 275 km, and the Kayseri-Gölbaşı part is 271 km. Furthennore, the nominal value of the cunent is 1050 A. xxiThe different operation conditions will absoluiely cause the different results to önerge. As a result of this, İhe good idea is that fhe Keban-Kaygeri-Golbaşı transmission üne is examined for the different operation conditions. Ih the work done here, to see the differences between fhese different operation conditions, six different possible conditions of operation of the Keban-Kayseri-Gölbaşı transmission üne are chosen. According to these six different operation modes, the operation regions are examined öne by öne. To reach the result, firstiy, for each mode, the generalized circuit constants A^3,C and D are calculated. Then, for each mode, to examine the static voltage stability, the P - V curves are drawn for the receiving end by keeping the sending end voltage constant, here 380 kV line-to-line. The detailed figüre that can be interpreted as a eqivalent circuit of the sample line is giveninFigure2. KebanKayseriGölbaşı -i l. A ir. £. l > A/*İ fi* nü û^aiy i^/A ------ y-g- -Ş-T. ±2 24- __m:^^^^fw^ ?“ -f 2 T*4-224- Fîg. 2 The Equivalent Circuü of The Keban-Kayseri-Gölbaşı Trânsmission Line. xxiiWhere Yİ : The total line shunt admittance per phase of the line between Keban and Kayseri Zl : The total line series impedanc» per phase of the line between Keban and Kayseri Y2 : The total line shunt admittance per phase of the line between Kayseri and Gölbaşı Z2 : The total line series impedance per phase ofthe line between Kayseri and Gölbaşı Zc : The total impedance per phase of the series capasitois in Kayseri Yshl : The admittance of each shunt reactors at the bus in Keban Ysh2 : The admittance of each shunt reactors at the bus in Gölbaşı To obtain the P - V curves, firstly, the graph of [Vs| - Pr should be obtained. The graph of | Vs| - Pr indicates the relation between the magnitude of the sending end voltage Vs and the active power Pr obtained at this end. To draw the graph of | Vs| - Pr, the equation Vs = AVr + BIr (1) is used as the basis ofthe drawing. When the equation (1) is taken into consideration; the following steps should be satisfied. XXlll1) The power angle of the receiving end should be constant, 2) The magnitude of the receiving end voltage Vr should be constant, 3) After the two steps given above are satisfied, the magnitude of the receiving end current is let to change from zero to its maximum nominal value. To sum up, for each angle, first, the magnitude of Vr is kept constant and the magnitude of Ir is let to change from zero to its maximum nominal value which also depends on the operation conditions. Thus, for each constant |Vr], Pr and Vs values are calculated for changing current values by using the equations (1) and Pr = Vrlrcos0 (2) where 0 is the phase angle of Ir and cos 0 is the power factor of the receiving end. This procedure is done also for each constant value of | Vr) and such following figures are obtained for each constant phase angle by locating each calculated |Vs| and Pr points. The result graph is given in Figure 3. X1CT 4 6 |VB|[V] 10 x1Q* Fig. 3 |Vs| versus Pr Graph for the phase angle «Jp=-80c XXIVAfter the graph of |Vs| - Pr is obtained, the following step is to find the intersection points of each curve at |Vs| = 220 kV. So, the Pr values and the Vr values corresponding to j Vs| = 220 kV are obtained easily on the Pr versus | Vs| graph drawn for each phase angle. After both the points of Pr and Vr are obtained, the another graph which is called u P - V curves”can be drawn. These Pr - |Vr| curves indicate the relation between the receiving end voltage | Vrj and the active power Pr obtained at this end. By using these curves, it is possible to trace the receiving end voltage-power profile and to determine the critical points. The third step is to obtain the graph of Pr - Qr. In this graph, Pr is the receiving end active power and Qr is the receiving end reactive power. To observe the effects of constraint operational quantities, the effects of voltage, current and load angle are taken into consideration. Firstly, to observe the effect of voltage, when the value of sending end voltage |Vsfhj is 220 kV, [Vrfh| must be constant and at the same time must be parameter. Under these conditions, to obtain the graph of Pr-Qr, the value of the receiving end current |Ir| is obtained. But, to obtain this current value, the value of load angle 5 must be obtained. After both the value of receiving end voltage and current are calculated, for the phase angle value = [-180° : 2° : 180° ], Pr and Qr values are calculated by using both the equation (3) and (4). Pr = 3|Vr||Ir|cos0 (3) Qr = 3|Vr||Ir|sin0 (4) Secondly, to observe the effect of current, when the value of sending end voltage |Vsfh| is 220 kV, |Irj must be constant and at the same time (j> must be parameter. Under these conditions, to obtain the graph of Pr-Qr, the value of the receiving end voltage IVrfhJ is obtained. But, to obtain this voltage value, the value of load angle 5 must be obtained. After both the value of receiving end voltage and current are calculated, for the phase angle value = [-90° : 2° : 90° ], Pr and Qr values are calculated by using xxvboth the equation (3) and (4). Thirdly, to observe the effect of load angle 5, when the value of sending end voltage |Vsfn| is 220 kV, 5 must be constant and at the same time (J> must be parameter. So, both the value of receiving end voltage and current are calculated. After both the value of receiving end voltage and current are calculated, for the phase angle value = [-90° : 2° : 90° ], Pr and Qr values are calculated by using both the equation (3) and (4). The obtained graph of Pr-Qr is indicating the relation between the receiving end active power Pr and the reactive power Qr at this end. All the works are done by using the computer program MATLAR xxvi
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