부산대학교 도서관

Module-based electrochemical energy storage can be used to reduce the ramp rate of PV generation with fluctuating insolation. As the capacitance of the module-based capacitive energy storage decreases, large fluctuations on the DC link voltage are expected caused by the variation in the PV power. It is important to design and implement effective control methods to reduce this undesired effect on the DC link voltage, especially with the use of lower capacitance (1 F). A comparison of feedforward compensation, set-point weighting and anti-windup control methods based on a proportional integral (PI) controller for DC link voltage is reported. Our case studies verify the effectiveness of a PI controller combined with feedforward compensation and anti-windup scheme, and demonstrate the improvements in the DC link voltage dynamics of a single-phase grid connected system.