Abstract
This paper deals with the control of a grid-connected multi-source power system based on a photovoltaic (PV) array and a battery energy storage system (ESS), taking into account the variable and intermittent characteristics of the solar irradiation level and the ambient temperature in Morocco. The PV generator is connected via a dc-dc boost converter to a common dc bus which is connected through a bidirectional dc-dc converter to the battery ESS. The dc bus output is connected to the mains via a PWM dc-ac converter with an LCL filter. The control technique consists of three parts: the PV array is considered as the primary source and the boost converter is controlled locally to generate the maximum power extraction (MPPT), while the bidirectional dc-dc converter of the ESS battery is controlled to ensure the energy balance according to the power flow under different solar irradiation and temperature conditions. The PWM inverter is controlled to regulate the DC bus voltage and maintain the power factor at the unit. The system is implemented in Matlab/Simulink environment. The effectiveness of the control strategy is carried out by simulation results.
Highlights
Grid-connected distributed generation (DG) based on renewable energy sources (RES) has received significant attention worldwide due to their drivers related to decreasing dependence on conventional fossil fuels resources, reducing greenhouse gas emissions and meeting the growing demand for energy
The results show that the reactive power is set to zero, the grid voltage is kept constant, and the measured grid current and active power follow the irradiation and temperature variations
The grid side converter shows that the measured direct and quadrature components of the grid current follow their references, and the dc bus voltage is maintained constant, these results demonstrate the dynamic (c) performance of the controllers
Summary
Grid-connected distributed generation (DG) based on renewable energy sources (RES) has received significant attention worldwide due to their drivers related to decreasing dependence on conventional fossil fuels resources, reducing greenhouse gas emissions and meeting the growing demand for energy. With a high level of radiation with an average value of about 5KWh/m2/day and an illumination hours of more than 3000 hours/year, Morocco does not escape this trend, an energy policy has been launched since 2009 and was accelerated, in December 2015, at the COP21 in Paris, aiming to increase the share of renewable energy up to 52% by 2030 [1] corresponding to an installed renewable capacity of 13000 MW which would limit the need of fossil fuels, reduce energy dependence to less than 82% [2]. Combined with the energy storage system (ESS) as stable energy source, the multi-source system are proposed to facilitate the connection of RES to MV distribution grid.
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