Tái ấu hình lưới điện phân phối để giảm tổn thất ông suất

Hong, “Reconfiguration of electric distri- bution networks for resistive line losses reduction,” IEEE Trans.. Lee, “Distribution feederreconfiguration for loss reduction,” IEEE Trans.. Pow

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 4

 5

 6

 7

 9

P 9

 9

 9

 13

 13

 15

 15

 16

 17

1.2.3.1  17

 18

 19

 19

 19

2.2 Cá 19

 20

  20

 22

 24

  25

 25

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 27

 27

 27

 27

 29

-Raphson 31

 31

 31

 32

 34

 4 39

  39

 39

 39

 40

4.1.3 Cá 41

 44

 45

 50

 54

 54

 54

 58

 60

 67

 72

 76

 78

 79

Hình 2.1: Gii thu t c a Merlin và Back 21

Hình 2.2:  23

Hình 3.1: Newton Raphson 32

Hình 3.2:  34

Hình 3.2:  38

Hình 4.1:  42

Hình 4.2:  2 .43

Hình 4.3:  44

Hình 4.4:  48

Hình 4.5:  49

Hình 4.6:  50

Hình 4.7:  51

Hình 4.8:  52

Hình 4.9:  52

Hình 5.1:  54

Hình 5.2:  55

Hình 5.3:  56

Hình 5.4:  472 E3.4, 475 E3.7 và 471 E3.14  69

Hình 5.5:  75

Hình 5.6:  77

B ng 2.1:  Phm vi ng d ng c a các bài toán tái c    20

B ng 2.2:   26

B ng 4.1 :  44

B ng 4.2 :  45

B ng 4.3 :  45

B ng 4.4 :  45

B ng 4.5 :  46

B ng 4.6 :  46

B ng 4.7 :  46

B ng 4.8 :  47

B ng 4.9 :   47

B ng 4.10 :  47

B ng 4.11 :  48

B ng 4.12:   48

B ng 4.13 :  49

B ng 4.14 :  49

B ng 4.15 Danh sách  :  50

B ng 5.1 :  70

B ng 5.2 :  71

B ng 5.3 :   72

B ng 5.4 :  72

B ng 5.5 :  73

B ng 5.5 :   74

B ng 5.7 :  74

B ng 5.8 :  74

Trong quá t

     n thân, tôi  thành 

 





 hàng



 ,

 c





     

       

               NL/KHKT ngày 24 tháng 3 

 2



-      : TBA g MBA (MBA): MBA T1

n áp 110/35/22 kV; MBA 110/35/22k

MBA

-  TBA có 2 MBA T1 25 MVA,

   110/35/10 kV và MBA T2   25 MVA   110/35/22 kV TBA có 

 MBA

-  TBA có MBA 2 TBA có 

MBA MBA có công

, 400 kVA, 560kVA và 630kVA :

- 

-E3.max dây 472- E3 max -E3.max là 8,118 MW

- 

               - max là 4,39

* Theo D Shirmohammadi and H.W Hong, “Reconfiguration of electric distri-

bution networks for resistive line losses reduction,” IEEE Trans Power

Del., vol 4, no 2, pp 1492 1498, Apr 1989–

* Theo S Civanlar, J J Grainger, H Yin, and S S H Lee, “Distribution feeder

reconfiguration for loss reduction,” IEEE Trans Power Del., vol 3, no.

3, pp 1217 1223, Jul 1988.–

* Theo T E McDermott, I Drezga, and R P Broadwater, “A heuristic non-

linear constructive method for distribution system reconfiguration,”

IEEE Trans Power Syst., vol 1 no 2, pp 478 483, May 1999 4, –

 tính toán hình                



 , 

- = , 

(2.6) (2.7)

x2 = - + x1 (2.23)

 k+1 k: Xk+1 - = + xk (2.24)



kk - f(x= k) (2.25) Tk = xk+1 - xk

kk theo xk+1 k

Hình 3

3.2.1.2 

1 x2n]T



F(x) = (2.26)

    i       hóa), ta có:

= Ui = Ui(cos + jsinCông sut ph c liên h  p t i nút i:

Pi jQi= = (2.30) Khai tring ph n th c và o ta có:  

Pi = (2.31)

Qi - = (2.32)

u Gán i = 0

 Pi,d và Qi,d là công sut tác d ng và ph  nút i

 Pi,t vàQi,t là công su t tác d ng và ph    c t i nút i theo công thc (10) và (11)

Trong n+1 

0 và n nút: nc nút PQ và ng nút PV

               có bi n tr

i ta có:

i = (i=1,nc) (2.39)

(2.42)

1

Ui{2Ui.Gii + (2.43)Các ph n t   ng chéo c a ma tr n J  2c xnh b ng: 

nh theo các công th c sau: 

m l n là t    h i t nhanh n u sai s   u nh ( chênh l ch gi a nghi m    

u và nghi m th c) Trái l i n u sai s       u l n, quá trình l p có th phân kì  

Nc x p x   u th a mãn, ta có th  chn giá tr  n áp các nút PQ bnh mn áp các nút PV theo giá tr  a các nút ly b ng 0 (b ng nút cân b ng)   

Tuy th i gian tính m  c l p c    -Raphson l n, 

  c l p yêu cng nh , h  thu c vào s nút c a   

             d i cho tính toán h 

thn có s nút b t k



S

Raphson trong tính 

g Sai

Nút 4: nút PQ, cho S4 -400 50i (kVA) = 

Nút 5: nút PQ, cho S5 -600 100i (kVA) = 

Hình 4.4: 

các khóasách các khóa Khóa 

1

1

các khóa => danh sách các khóa 

Danh sách các khóa tia, các khóa  

1

1

1

5 TÍNH TOÁN 



 Nút Bus data 

Hình 5.2: 

 Nút Line data 

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

busdatas = xlsread('busdatas.xlsx');

% hObject handle to Nhap_nhanh (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

linedatas = xlsread('linedatas.xlsx');

% - Executes on button press in Chay

% hObject handle to Chay (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

xlswrite('khoa_mo.xlsx', khoamo2);

set(handles.delta_p,'String',num2str(deltaP)); winopen('khoa_mo.xlsx');

else if nhanh(m,3) == kiemtra(n)

if isempty(s) && khoamo1(l,t) ~= 0

else if nhanh(m,3) == kiemtra(n)

             Newton-



% Program for Newton-Raphson Load Flow Analysis

% Calling ybusppg.m to get

Y = ybusppg(lined);

Y-Bus Matrix

% Base kVA

BMva = 100000;

bus = busd(:,1); % Bus Number

type = busd(:,2); % Type of Bus 1-Slack,

2-PV, 3-PQ

V = busd(:,3); % Specified Voltage

del = busd(:,4); % Voltage Angle

G = real(Y); % Conductance matrix

B = imag(Y); % Susceptance matrix

pv = find(type == 2 | type == 1); % PV Buses

Q(i) = Q(i) + V(i)*

V(k)*(G(i,k)*sin(del(i)-del(k)) - del(k)));

end

end

if Iter <= 7 && Iter > 2 % Only checked up to 7th iterations

V(n)*(-del(n)));

end

J1(i,k) = J1(i,k) - V(m)^2*B(m,m); else

J1(i,k) = V(m)*

V(n)*(G(m,n)*sin(del(m)-del(n)) - del(n)));

end

J2(i,k) = J2(i,k) + V(m)*G(m,m); else

J2(i,k) = del(n)) + B(m,n)*sin(del(m)-del(n)));

end

J3(i,k) = J3(i,k) - V(m)^2*G(m,m); else

end

J4(i,k) = J4(i,k) - V(m)*B(m,m); else

J4(i,k) = del(n)) - B(m,n)*cos(del(m)-del(n)));

end

end

end

J = [J1 J2; J3 J4]; % Jacobian Matrix

X = inv(J)*M; % Correction Vector

dTh = X(1:nbus-1); % Change in Voltage

Angle

dV = X(nbus:end); % Change in Voltage

Magnitude

del(2:nbus) = dTh + del(2:nbus); % Voltage Angle

fb = lined(:,2); % From bus number

tb = lined(:,3); % To bus number

nl = length(fb); % No of Branches

fb = lined(:,2); % From bus number

tb = lined(:,3); % To bus number

b = 1i*b; % Make B imaginary

nb = max(max(fb),max(tb)); % No of buses

nl = length(fb); % No of branches

Y = zeros(nb,nb); % Initialise YBus

% Formation of the Off Diagonal Elements

%Y; % Bus Admittance Matrix

%Z = inv(Y); % Bus Impedance Matrix

 -g

 

-% Polar to Rectangular Conversion

% [RECT] = RECT2POL(RHO, THETA)

% RECT - Complex matrix or number, RECT = A + jB, A = Real, B = Imaginary

% RHO - Magnitude

% THETA - Angle in radians

rect = rho.*cos(theta) + j*rho.*sin(theta);