Efficiency analysis of PI-controlled DC DC power boost converters by load sharing method

In this study a novel method is presented for DC/DC Cascade boost converters design using PI controller block. In first step, cascade boost converter structures has investigated and in next steps PI controller block has designed and parallel cascaded boost converters has controlled by using PI controller block and tested by different values of input voltages and output loads. This approach reinforces a same voltage source by using two or more cascade boost converter blocks simultaneously and is very effective in power transmission in renewable energy resources where they produce limited amount of power. In this converter, output voltage and current ripples are lower than 0.1%. One advantage of using this circuit compared to conventional boost converters is its long life because of input current division at the input blocks. A PI block controls voltage production confronting rapid load or input voltage changes by duty cycle changing results of the simulation confirmed the theoretical design. This designing and drive MOSFETs and restrict output voltage ripple. This circuit is simulated by MATLAB/SIMULINK and CADENCE for preparing to instruction and has implemented on a parallel structure with two blocks of cascade boost converters at laboratory scales. This work is modeling droop controller based on droop coefficients refreshing method for parallel cascaded DC/DC boost converters structure by nonlinear PI control technique for load sharing problem. It can expand to more than two parallel cascaded layers according to amount of input power or every cascade capability for power transmission. In our implementation, we used two same layers of cascaded boost converters. For a droop value of 0.7VDC for output voltage, results show that the current is doubled as we use two same resistors as load. Simulation results has obtained in Matlab/SIMULINK and confirming theoretical designing. This technique is suitable for all low voltage and high voltage gain applications. Also it has all specifications of a good boost converter as no changing ability for output voltage according to sudden changes in output loads or input voltages.