An Integrated Hybrid Power Supply for Distributed Generation Applications Fed by Nonconventional Energy Sources

Abstract

Abstract-A new, hybrid integrated topology, fed by photovoltaic (PV) and fuel cell (FC) sources and suitable for distributed generation applications, is proposed. It works as an uninterruptible power source that is able to feed a certain minimum amount of power into the grid under all conditions. PV is used as the primary source of power operating near maximum power point (MPP), with the FC section (block), acting as a current source, feeding only the deficit power. The unique "integrated" approach obviates the need for dedicated communication between the two sources for coordination and eliminates the use of a separate, conventional dc/dc boost converter stage required for PV power processing, resulting in a reduction of the number of devices, components, and sensors. Presence of the FC source in parallel (with the PV source) improves the quality of power fed into the grid by minimizing the voltage dips in the PV output. Another desirable feature is that even a small amount of PV power (e.g., during low insolation), can be fed into the grid. On the other hand, excess power is diverted for auxiliary functions like electrolysis, resulting in an optimal use of the energy sources. The other advantages of the proposed system include low cost, compact structure, and high reliability, which render the system suitable for modular assemblies and "plug-n-play" type applications. All the analytical, simulation, and experimental results of this research are presented.

Lithium ion batteries ageing analysis when used in a PV power plant

“…This will require a more predictable and reliable performance, which will open the way to implement hybrid generation technologies and integrate ESS into PV power plants [3]. Some research has already been carried on guaranteeing a more predictable production of PV systems, combining them with different technologies such as: hydrogen fuel cells [4], together with wind power [5], or even batteries [6], mainly focusing on small grids or stand-alone PV power plants [7]. This paper deals with the integration of Lithium ion (Liion) batteries into big PV power plants connected to the EPS.…”

Analysis on renewable energy systems

“…An uninterrupted integrated hybrid power supply is offered to the grid and a small amount of PV power can be fed into the grid. β Method in fast MPPT scheme with suitable modification is implemented here [73] with maximum insolation and high temperature. A control system is realized with a fuel cell generation device in a photovoltaic-wind existing plant and function of the plant is carried out with the combination of diesel generator and battery [74].…”

Optimizing PV system performance considering the impacts of non-uniform irradiance and partial shading

“…Among those renewable sources, PV generation is becoming increasingly attractive due to availability of resources and environmental benefits. As the penetration of PV schemes increases it can have a significant impact on the power system's operation and stability and hence it is significantly important to control the output power [1].…”