A modified PID controller of SEPIC converter for excellent dynamic performance

Single-ended primary inductor converter (SEPIC) is widely used in battery charging of renewable energy and electric/hybrid vehicles due to its output gains range flexibility, less complex switching design, providing an isolation by using series capacitor and producing non-inverted output. This paper presents a modified PID controller to obtain excellent dynamic performance with zero steady-state error. The controller design is discussed and built in discrete model simulation on Matlab-Simulink. The effectiveness of the proposed modified PID control strategy is tested for the transient cases in step-changed load, step-changed reference voltage, and varying input voltages. The results show the proposed controller can compensate overshoot percentage (%OS), reach zero steady-state error and produce lower ripple in voltage.