Abstract
In photovoltaic system, solar energy is not able to be directly utilized to the grid. This is because the the generated output voltage from solar array are fluctuating depends on the environmental condition, such as the intensity of solar irradiance and temperature. Any changes from those variables will affect the generated output voltage. Boost converter is one type of power converter that is able to regulate the output voltage of solar array to dc grid. However, the dynamics of boost converter is nonlinear and non-minimum phase. Therefore, it requires an appropriate control method that can force the output voltage follows the desired reference voltage, by considering the fluctuation of environmental conditions and loads. To reduce the number of sensors and cost investment, nonlinear observer technique is employed to estimate the input voltage and load variations. By considering this problem, this paper is aimed at designing nonlinear observer based on adaptive sliding mode control with PI sliding surface for boost converter. The stability of proposed system is investigated through analytical and simulation proof. As comparison with PID controller, the performance of proposed system has produced Integral Absolute Error (IAE) about 7 times smaller than PID controller when it is tested under various conditions.
Highlights
The research on renewable energy area has become massively developed over the last decades due to the fact that renewable energy provides clean power generation [1,2]
The output voltage of solar array is relatively low. Power converters, such as boost converter is implemented to rise the output voltage generated from photovoltaic
Voltage generated from solar array is affected by the intensity of solar irradiance and temperature
Summary
The research on renewable energy area has become massively developed over the last decades due to the fact that renewable energy provides clean power generation [1,2]. The output voltage of solar array is relatively low. Power converters, such as boost converter is implemented to rise the output voltage generated from photovoltaic. When solar irradiance and temperature vary, the output voltage will be varying [4] Based on those problems, boost converter is employed to regulate the output voltage produced by photovoltaic. Boost converter is employed to regulate the output voltage produced by photovoltaic This converter is the fundamental device of DC/DC converter to increase the input voltage level. The intensity of solar irradiance and temperature variations have to be considered for designing the controller in order to obtain the best performance for voltage regulation of this converter
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