MATLAB: Consecutive Zero Crossings stop

simpowersystemsSimscape Electricalsimulinkzerocrossing error

I'm implementing a Zero-Voltage Switching Buck Converter in SimPowerSystems. It gives me the consecutive zero crossing error. I've disabled that in the Configuration Parameters, but it still stops processing at the same early point. The system is designed to have zero crossings, so I can't just get rid of them.

Is there some way to stop SimPowerSystems from stopping when it hits 1000 zero crossings?

Best Answer

You can increase the Number of consecutive zero crossings setting in the Solver pane of the Configuration Parameters window.

Related Solutions

MATLAB: Zero-crossing calculation

This is reasonably robust:

function ZC = ZeroX(x,y)
zci = @(v) find(v(:).*circshift(v(:), [-1 0]) <= 0);                    % Returns Approximate Zero-Crossing Indices Of Argument Vector
zxidx = zci(y);
for k1 = 1:numel(zxidx)
    idxrng = max([1 zxidx(k1)-1]):min([zxidx(k1)+1 numel(y)]);
    xrng = x(idxrng);
    yrng = y(idxrng);
    ZC(k1) = interp1( yrng(:), xrng(:), 0, 'linear', 'extrap' );
end
end
x = linspace(0, 11*pi, 42);                                             % Create Data

y = sin(x);                                                             % Create Data
ZC = ZeroX(x,y);
figure(1)
plot(x, y, '-r')
hold on
plot(ZC, zeros(size(ZC)), 'pg')
hold off
grid

MATLAB: Optimizing zero-crossing indices

I wrote ‘zci’ so I will do my best to help you with it.

It contains no error checking, so there can be a ‘wrap-around’ effect because of circshift, such that if the end of a sequence is on one side of zero and the beginning of the sequence is on the other, ‘zci’ will consider this a true zero-crossing, even though it is not. That may be what you are seeing. The solution is simply to delete the last index.

(I may consider writing a full function version of it as a File Exchange contribution that checks the ends of the sequence, and automatically deletes the end index in that event. The anonymous function version does not have that option.)

Best Answer

Related Solutions

MATLAB: Zero-crossing calculation

MATLAB: Optimizing zero-crossing indices

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