Design of PID based LCL resonant converter for DC to DC system including source inductance

In this paper performance and stability analysis of LCL resonant converter is analyzed in presence of the source inductance. Most of the researchers do not consider the source inductance value; they assumed it to be ideal. But in reality it has some negative impact over the systems stability and output of the system. Resonant converter has wide applications in telecommunication, aerospace, radar power applications and power supplies. There are three topologies of RC's like LCC, LCL and LCL-T RC. On comparing these three configurations of RC, the LCL RC has good stability region. Stability analysis has been done by Lyapunov stability analysis, Root locus analysis and Nyquist plot analysis. Open loop response and closed loop response of PID controller is compared with and without source inductance and concluded that PID has better response than open loop system. The parameters like rise time, settling time and overshoot are taken in to account. The result of this paper proves that, on including source inductance, the rise time, settling time and overshoot becomes higher. The open loop system has 80% of increased oscillations and settling time. But on using PID controller the oscillations has been reduced to 50% and settling time also reduced. Thus PID controller has better response than open loop system. These results are simulated using MATLAB/SIMULINK software package.