MATLAB: How to solve algebraic loop error?

Question

Hii….I came across this error while making a model..

Simulink cannot solve the algebraic loop containing 'trial_3/PV panel/PV module' at time 0.0 using the TrustRegion-based algorithm due to one of the following reasons: the model is ill-defined i.e., the system equations do not have a solution; or the nonlinear equation solver failed to converge due to numerical issues. To rule out solver convergence as the cause of this error, either a) switch to LineSearch-based algorithm using set_param('trial_3','AlgebraicLoopSolver','LineSearch') b) reducing the VariableStepDiscrete solver RelTol parameter so that the solver takes smaller time steps. If the error persists in spite of the above changes, then the model is likely ill-defined and requires modification.

I am using coding to make photovoltaic panel and MPPT P&O algorithm.

Please help me to solve this error.

Answer 1

Algebraic loop occurs often, when you have a feedback through a constant block or equivalent, which means your signal y(t0)=constant * y(t0) , you should have y(t0+1)=constant*y(t0) which you can get with a unit delay block