A DC Side Power Ramp Rate Control Strategy for High Performance and Low Cost PV Systems

Facing the fast growth of grid-tied installation and the intermittent nature of solar radiation, the power ramp rate control (PRRC) has become an essential function in PV power systems. Traditionally, the system heavily relies on a battery energy storage system (BESS) to mitigate the intermittency and maintain grid resilience. However, it is a high-cost solution considering the battery management system (BMS), lifetime, maintenance, and recycling. Active power reserve control recently draws research attention to remove or minimize the usage of BESS. This paper proposed a novel PRRC scheme, free of the utilization of BESS or solar irradiance forecasting. The development is based on the in-depth analysis of PV output characteristics and real-world solar irradiance data. It shows an improvement regarding energy harvest efficiency, ramp rate control success rate and transient performance in comparison to the prior works. The advantages are clearly demonstrated by both the simulation and experiment test.