We need to solve the problem due to the nonlinearity and power fluctuation in the photovoltaic (PV) connected storage system and grid; for that, the authors develop an algorithm to obtain the maximum power point tracking (MPPT) via control of the duty cycle of DC/DC boost converter. Consequently, they design an MPPT based on the second-order sliding mode control. Next, generating the law control founded on the Lyapunov theory can augment the robustness and stability of the PV connected grid. Then, they add a battery energy storage system (BESS) with a control management algorithm in the DC/DC side to eliminate any fluctuation of the output power of the PV system because of the temperature and irradiation variation. On the grid side, they control the DC/AC inverter side by the three-phase voltage source inverter control (VSIC) as a charge controller for the grid parameters.
TopIntroduction
Nowadays, the grid-connected photovoltaic (PV) with batteries energy storage system (BESS) show in Figure 1 is growth because of the rapid of using of a PV as source energy otherwise the system controller confronted with a lot challenges of keeping a grid reliability and stability (R. Teodorescu, M. Liserre, P. Rodrlguez, 2011). In Figure.1, two global factors key of PV grid-connected with the energy storage system should be obtained (Mehmet Yesilbudak, Ramazan Bayindir, 2018). The first factor is the effects of climatic conditions present in the irradiation, temperature and other meteorological conditions. The second factor is the influence of the DC/AC inverter (J. M. Carrasco, L. G. Franquelo, J. T. Bialasiewicz, et al, 2006; Raghvendraprasad Deshpande, 2019). Surely, the climatic conditions are uncontrollable, for that reason, a Batteries-Energy-Storage-System is added in the DC side of the PV system to compensate the fluctuation of PV output power when we have a changing in the level of the irradiation and temperature (J. Liu, W. Luo, X. Yang, et al, 2016; Y. Yang, Q. Ye, L. Tung, et al, 2018). We design a control of the DC/DC boost converter via a Maximum Power Point Tracking (MPPT) effectively to keep the output power at the demanded quality of the PV system. The grid transfer the maximum power of a PV power system into the high value, which is the global goal of a PV grid-connected and BESS, the system of power generation, i.e., despite the changes in climatic conditions, the factor of a power of the PV grid-connected system is independent (A. Kouchaki, H. Iman-Eini, B. Asaei, 2013; M. H. Moradi, A. R. Reisi, 2011).
Figure 1. Topology of BESS connected PV and grid
Actually, many studies oriented to PV-grid connected BEES. In reference (Dezhi Xua, Gang Wanga, Wenxu Yana, Xinggang Yanb, 2019), a second-order sliding mode controller applied to a DC/DC Boost Converter and we realized the control. Tracking of the output voltage. When the PV panel connected to the DC side, the maximum power point tracking (MPPT) established via the use of sliding mode control based on the Lyapunov function-Theory we can be designed a good controller to determine the stability of the system. The work in (Kok Soon Tey ; Saad Mekhilef ; Mehdi Seyedmahmoudian; Ben Horan; Amanullah Than Oo; Alex Stojcevski, 2018) the control strategy proposed of the voltage and frequency for the energy resource system, were simulated the control impact of different types of loads, also, of multiple resource units. However, we notice in the anthers simulations as (S. Kolesnik and A. Kuperman, 2016) the author does not use the compensation of energy resources in the simulation, and there is no energy storage unit in the system. However, in our work, the control algorithm designed without the last limitations, we improve that with a batteries energy storage system unit was considered in the global PV system under study.