How to eliminate Algebraic loop in Proportional Gain of PID controller?

I am working on MPPT algorithm (incremental Conductance) to track the voltage and current for maximum power transfer and I get the error of Trouble Solving Algebraic loop at simulation time 0.002255. And the error is located on the proportional block of the PID controller used to generate triggering pulse for the IGBT. Please help. Thank you in advance.