The power generation from renewable power sources is variable in nature, and may contain unacceptable fluctuations, which can be alleviated by using energy storage systems. However, the cost of batteries and their limited lifetime are serious disadvantages. To solve these problems, an improvement consisting in the collaborative association of batteries and supercapacitors has been studied. Nevertheless, these studies don’t address in detail the case of residential and large-scale photovoltaic systems. In this paper, a selected combined topology and a new control scheme are proposed to control the power sharing between batteries and supercapacitors. Also, a method for sizing the energy storage system together with the hybrid distribution based on the photovoltaic power curves is introduced. This innovative contribution not only reduces the stress levels on the battery, and hence increases its life span, but also provides constant power injection to the grid during a defined time interval. The proposed scheme is validated through detailed simulation and experimental tests.

This study presents a way of using the photovoltaic power plants for helping the grid to regulate the point of common coupling voltage, not only for injecting active power. This functionality of the photovoltaic resources has become a need as some countries' standards propose renewable energy to increase the voltage when a sag happens. In addition, this philosophy could also be applied in smart grids where the power must be controlled by the distributed generation. In this study, active power injection is developed by a reference power point tracking and reactive power regulation is carried out by controlling the node voltage, both with dq current control under different power priority possibilities. The generic flow diagram of the control algorithm was implemented on a single-stage traditional inverter topology. The whole system has been checked with a simulation model, including the control algorithm, in order to tune the controller for obtaining the best performance. Finally, an experimental prototype was implemented for validating the proposed node voltage regulating method.

No abstract

No abstract

No abstract