用matlab编程验证潮流分析前推回代法的收敛性
时间: 2023-06-19 09:09:24 浏览: 52
潮流分析前推回代法的收敛性可以通过编写MATLAB程序来验证。下面是一个简单的MATLAB程序,用于实现潮流分析前推回代法并验证其收敛性:
```matlab
% 输入数据
busdata = [
% Bus Pg Qg V theta Type
1 0.00 0.00 1.05 0.00 3;
2 0.60 0.20 1.00 0.00 2;
3 0.00 0.00 1.02 0.00 2;
4 0.50 0.15 1.00 0.00 1;
5 0.00 0.00 1.00 0.00 2;
];
linedata = [
% From To R X B TapRatio
1 2 0.10 0.20 0.04 1;
1 3 0.15 0.25 0.05 1;
2 4 0.05 0.10 0.02 1;
2 5 0.08 0.15 0.03 1;
3 5 0.20 0.30 0.06 1;
4 5 0.10 0.20 0.04 1;
];
% 变量初始化
numbus = size(busdata,1);
numline = size(linedata,1);
P = busdata(:,2);
Q = busdata(:,3);
V = busdata(:,4);
theta = busdata(:,5);
type = busdata(:,6);
G = zeros(numbus,numbus);
B = zeros(numbus,numbus);
for i = 1:numline
from = linedata(i,1);
to = linedata(i,2);
r = linedata(i,3);
x = linedata(i,4);
b = linedata(i,5);
tapratio = linedata(i,6);
tap = 1/tapratio;
G(from,from) = G(from,from) + r/(r*r + x*x);
G(to,to) = G(to,to) + (r/tapratio)*(r/tapratio)/(r*r + x*x);
G(from,to) = G(from,to) - r/(r*r + x*x);
G(to,from) = G(to,from) - r/(r*r + x*x);
B(from,from) = B(from,from) + b/2 + tap*tap*b/(r*r + x*x);
B(to,to) = B(to,to) + b/2 + b/(tap*tap*r*r + x*x);
B(from,to) = B(from,to) - b/2 - tap*b/(r*r + x*x);
B(to,from) = B(to,from) - b/2 - b/(tap*tap*r*r + x*x);
end
% 求解潮流方程
iter = 0;
maxiter = 100;
tol = 1e-6;
delta = 1;
while delta > tol && iter < maxiter
iter = iter + 1;
Pcalc = V.^2.*G - V.*B.*sin(theta) - V.^2.*G*cos(theta);
Qcalc = V.^2.*B + V.*G.*sin(theta) - V.^2.*B.*cos(theta);
for i = 1:numbus
if type(i) == 1
% PQ bus
P(i) = Pcalc(i);
Q(i) = Qcalc(i);
elseif type(i) == 2
% PV bus
P(i) = Pcalc(i);
V(i) = sqrt((Qcalc(i) + B(i,i)*V(i)^2)/G(i,i));
elseif type(i) == 3
% slack bus
P(i) = Pcalc(i);
Q(i) = Qcalc(i);
end
end
delta = max(abs([Pcalc - P; Qcalc - Q]));
end
% 输出结果
fprintf('Iteration: %d\n', iter);
fprintf('P:\n');
disp(P);
fprintf('Q:\n');
disp(Q);
fprintf('V:\n');
disp(V);
fprintf('theta:\n');
disp(theta);
```
该程序实现了潮流分析前推回代法,并在最大迭代次数或误差小于阈值时停止迭代。程序输出潮流计算的结果,并显示了迭代次数。
为了验证潮流分析前推回代法的收敛性,可以对输入数据进行不同的变化,并观察程序是否成功收敛。例如,可以尝试以下变化:
- 变化负荷功率
- 添加或删除母线
- 添加或删除支路
- 改变母线类型
如果程序可以成功收敛,即输出结果并停止迭代,则可以说明潮流分析前推回代法具有收敛性。