Control of DC-link by Adaptive PID Control for DC/DC Boost Converter

Generally, a photovoltaic (PV) system generates a wide range of voltages and currents at the terminal output. Normally, the PV cell cannot functionally maintain a constant direct current (DC) voltage while incident illumination and ambient temperature. To overcome that problem, a power electronics convertor such as DC/DC converter with the control scheme topology may be used. However, a linear conventional controller like PID control scheme is not suitable to be a controller for regulating the output voltage of DC/DC converter due to nonlinearity of converter. In this paper, the adaptive PID control scheme is considered to stabilizing the output voltage of the DC/DC converter in order to maintain and stabilize the constant DC-link voltage in both power line and load variations. Conventional control is compared with the proposed controller in both transient and steady state responses. The results show that the proposed control scheme is more performance than conventional control scheme. The transient response is improved by the proposed controller, in which the gain parameters are automatically tuned. Moreover, at steady state response is more robust against to the uncertainty while operation.