GETV0 Get initial voltage profile for power flow calculation.
Note: The pv bus voltage will remain at the given value even for
flat start.
type_initialguess: 1 - initial guess from case data
2 - flat start
3 - from input0001 function V0 = getV0(bus, gen, type_initialguess, V0) 0002 %GETV0 Get initial voltage profile for power flow calculation. 0003 % Note: The pv bus voltage will remain at the given value even for 0004 % flat start. 0005 % type_initialguess: 1 - initial guess from case data 0006 % 2 - flat start 0007 % 3 - from input 0008 0009 % MATPOWER 0010 % $Id: getV0.m 1635 2010-04-26 19:45:26Z ray $ 0011 % by Rui Bo 0012 % Copyright (c) 2009-2010 by Rui Bo 0013 % 0014 % This file is part of MATPOWER. 0015 % See http://www.pserc.cornell.edu/matpower/ for more info. 0016 % 0017 % MATPOWER is free software: you can redistribute it and/or modify 0018 % it under the terms of the GNU General Public License as published 0019 % by the Free Software Foundation, either version 3 of the License, 0020 % or (at your option) any later version. 0021 % 0022 % MATPOWER is distributed in the hope that it will be useful, 0023 % but WITHOUT ANY WARRANTY; without even the implied warranty of 0024 % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 0025 % GNU General Public License for more details. 0026 % 0027 % You should have received a copy of the GNU General Public License 0028 % along with MATPOWER. If not, see <http://www.gnu.org/licenses/>. 0029 % 0030 % Additional permission under GNU GPL version 3 section 7 0031 % 0032 % If you modify MATPOWER, or any covered work, to interface with 0033 % other modules (such as MATLAB code and MEX-files) available in a 0034 % MATLAB(R) or comparable environment containing parts covered 0035 % under other licensing terms, the licensors of MATPOWER grant 0036 % you additional permission to convey the resulting work. 0037 0038 %% define named indices into bus, gen, branch matrices 0039 [PQ, PV, REF, NONE, BUS_I, BUS_TYPE, PD, QD, GS, BS, BUS_AREA, VM, ... 0040 VA, BASE_KV, ZONE, VMAX, VMIN, LAM_P, LAM_Q, MU_VMAX, MU_VMIN] = idx_bus; 0041 [F_BUS, T_BUS, BR_R, BR_X, BR_B, RATE_A, RATE_B, ... 0042 RATE_C, TAP, SHIFT, BR_STATUS, PF, QF, PT, QT, MU_SF, MU_ST] = idx_brch; 0043 [GEN_BUS, PG, QG, QMAX, QMIN, VG, MBASE, ... 0044 GEN_STATUS, PMAX, PMIN, MU_PMAX, MU_PMIN, MU_QMAX, MU_QMIN] = idx_gen; 0045 0046 %% generator info 0047 on = find(gen(:, GEN_STATUS) > 0); %% which generators are on? 0048 gbus = gen(on, GEN_BUS); %% what buses are they at? 0049 if type_initialguess == 1 % using previous value in case data 0050 % NOTE: angle is in degree in case data, but in radians in pf solver, 0051 % so conversion from degree to radians is needed here 0052 V0 = bus(:, VM) .* exp(sqrt(-1) * pi/180 * bus(:, VA)); 0053 elseif type_initialguess == 2 % using flat start 0054 V0 = ones(size(bus, 1), 1); 0055 elseif type_initialguess == 3 % using given initial voltage 0056 V0 = V0; 0057 else 0058 fprintf('Error: unknow ''type_initialguess''.\n'); 0059 pause 0060 end 0061 % set the voltages of PV bus and reference bus into the initial guess 0062 V0(gbus) = gen(on, VG) ./ abs(V0(gbus)).* V0(gbus);