lf.rar_flow

% Program for Bus Power Injections, Line & Power flows (p.u)... function [Pi Qi Pg Qg Pl Ql] = loadflow14(nb,V,del,BMva) nb=14; Y = ybus14(nb); % Calling Ybus program.. lined = linedatas14(nb); % Get linedats.. busd = busdatas14(nb); % Get busdatas.. Vm = pol2rect(V,del); % Converting polar to rectangular.. Del = 180/pi*del; % Bus Voltage Angles in Degree... fb = lined(:,1); % From bus number... tb = lined(:,2); % To bus number... nl = length(fb); % No. of Branches.. Pl = busd(:,7); % PLi.. Ql = busd(:,8); % QLi.. Iij = zeros(nb,nb); Sij = zeros(nb,nb); Si = zeros(nb,1); % Bus Current Injections.. I = Y*Vm; Im = abs(I); Ia = angle(I); %Line Current Flows.. for m = 1:nl p = fb(m); q = tb(m); Iij(p,q) = -(Vm(p) - Vm(q))*Y(p,q); % Y(m,n) = -y(m,n).. Iij(q,p) = -Iij(p,q); end Iij = sparse(Iij); Iijm = abs(Iij); Iija = angle(Iij); % Line Power Flows.. for m = 1:nb for n = 1:nb if m ~= n Sij(m,n) = Vm(m)*conj(Iij(m,n))*BMva; end end end %Sij = sparse(Sij); Pij = real(Sij); Qij = imag(Sij); % Line Losses.. Lij = zeros(nl,1); for m = 1:nl p = fb(m); q = tb(m); Lij(m) = Sij(p,q) + Sij(q,p); end Lpij = real(Lij); Lqij = imag(Lij); % Bus Power Injections.. for i = 1:nb for k = 1:nb Si(i) = Si(i) + conj(Vm(i))* Vm(k)*Y(i,k)*BMva; end end Pi = real(Si); Qi = -imag(Si); Pg = Pi+Pl; Qg = Qi+Ql; disp('#########################################################################################'); disp('-----------------------------------------------------------------------------------------'); disp(' Newton Raphson Loadflow Analysis '); disp('-----------------------------------------------------------------------------------------'); disp('| Bus | V | Angle | Injection | Generation | Load |'); disp('| No | pu | Degree | MW | MVar | MW | Mvar | MW | MVar | '); for m = 1:nb disp('-----------------------------------------------------------------------------------------'); fprintf('%3g', m); fprintf(' %8.4f', V(m)); fprintf(' %8.4f', Del(m)); fprintf(' %8.3f', Pi(m)); fprintf(' %8.3f', Qi(m)); fprintf(' %8.3f', Pg(m)); fprintf(' %8.3f', Qg(m)); fprintf(' %8.3f', Pl(m)); fprintf(' %8.3f', Ql(m)); fprintf('\n'); end disp('-----------------------------------------------------------------------------------------'); fprintf(' Total ');fprintf(' %8.3f', sum(Pi)); fprintf(' %8.3f', sum(Qi)); fprintf(' %8.3f', sum(Pi+Pl)); fprintf(' %8.3f', sum(Qi+Ql)); fprintf(' %8.3f', sum(Pl)); fprintf(' %8.3f', sum(Ql)); fprintf('\n'); disp('-----------------------------------------------------------------------------------------'); disp('#########################################################################################'); disp('-------------------------------------------------------------------------------------'); disp(' Line FLow and Losses '); disp('-------------------------------------------------------------------------------------'); disp('|From|To | P | Q | From| To | P | Q | Line Loss |'); disp('|Bus |Bus| MW | MVar | Bus | Bus| MW | MVar | MW | MVar |'); for m = 1:nl p = fb(m); q = tb(m); disp('-------------------------------------------------------------------------------------'); fprintf('%4g', p); fprintf('%4g', q); fprintf(' %8.3f', Pij(p,q)); fprintf(' %8.3f', Qij(p,q)); fprintf(' %4g', q); fprintf('%4g', p); fprintf(' %8.3f', Pij(q,p)); fprintf(' %8.3f', Qij(q,p)); fprintf(' %8.3f', Lpij(m)); fprintf(' %8.3f', Lqij(m)); fprintf('\n'); end disp('-------------------------------------------------------------------------------------'); fprintf(' Total Loss '); fprintf(' %8.3f', sum(Lpij)); fprintf(' %8.3f', sum(Lqij)); fprintf('\n'); disp('-------------------------------------------------------------------------------------'); disp('#####################################################################################');