Modified PID Controller For DC-DC Buck Converter Using Voltage Based PWM

Muhammad Nor Zaini, Sharul Aidy (2015) Modified PID Controller For DC-DC Buck Converter Using Voltage Based PWM. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The usage of power electronic converters have been used widely since the invention of the devices. The main purpose includes converting electrical energy from one form into another form. Buck converter is one of the typical power electronic converters that changes the unregulated voltage into a regulated voltage, and provides different voltage level at its output. Operation of buck converter alone shows overshoot at the first moment of its start up. Thus, a control method is proposed so that the performance of the buck converter can be enhanced and the overshoot can be eliminated, as well as improving other significance characteristic, taking into account internal and external disturbances that might occur. A modified PID controller is proposed to control the buck converter output voltage. In this research, the main objective is to compare the system’s responses between the conventional PID, PI and the proposed modified PID controller. With that, conventional PID method is applied first to compare the characteristic given by the buck converter using conventional and modified controller. The tuning method used is the zero-pole placement in the root locus method. The method is chosen after the mathematical model of the buck converter, the output voltage in transfer function managed to be derived. The result shows that regardless of being regarded as conventional, buck converter achieves its optimum performance with the normal PID as its controller. In conclusion, from the comparative analysis, conventional PID is more suitable to be the controller for buck converter operation as compared to others.

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