This paper presents a discrete PWM controller for SEPIC (Single ended Primary Inductor Converter) converter. SEPIC is chosen since it has positive voltage gain and higher characteristics than any other converter. To improve the transient response and dynamic stability of the proposed converter, Discrete PID controller is the most preferable one. The proposed controller improves the dynamic performance of the SEPIC converter by achieving a robust output voltage against load disturbances, input voltage variations and changes in circuit components. The converter is designed through simulation using MATLAB / Simulink and performance parameters are also measured. The discrete controller is implemented, design goal is achieved and the same is verified against theoretical calculation using LabVIEW. Keywords: SEPIC converter, Discrete PID Controller, Analog to Digital Converter (ADC), Digital Pulse Width Modulator (DPWM).
Fossil fuels reserves are decreasing in a rapid pace due to more power consumption. Advancement of technology, usage of electrical equipments and increase in population are the main reasons for energy consumption. In order to meet the energy demand and to sustain the environment depending on non-conventional sources of energy is inevitable. Solar energy is the clean energy source which is naturally available in abundant and does not contribute to green house gases. The energy from the sun is directly converted into the electricity by using photovoltaic (PV) cells without using any intermediate steps. Solar charge controller is connected to the PV system for regulating the voltage and current coming from PV panel and to prevent overcharging of battery thereby increasing the life of battery. PID controller is used to obtain the desired voltage and for constant recharging of lead-acid battery. This paper addresses the modeling and simulation of Photovoltaic system under Maximum power Point Tracking (MPPT) condition and design of Buck converter with PID controller for constant charging of battery.
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