Abstract
Battery energy storage systems (BESS) can alleviate the unstable effects of intermittent renewable energy systems, such as solar and wind power systems. In addition, a BESS can level the load of the existing utility grid. The penetration rate of this type of system is expected to increase in the future power grid, i.e., the microgrid. In this paper, a modeling technique is proposed that allows users to customize the photovoltaic (PV) battery hybrid systems. A dynamic power system computer-aided design/electromagnetic transients including DC system (PSCAD/EMTDC) model of a PV battery hybrid system is presented in this paper. Dynamic modeling of PV arrays, BESS, maximum power point tracking (MPPT) algorithms, and bidirectional converters are provided as well. The PV model, battery model, and MPPT control model are designed using a user-defined model (UDM) for custom electromagnetic transient simulation. A control method for stabilizing the output of the PV battery hybrid system is proposed. Finally, a PSCAD/EMTDC simulation is conducted to verify the effectiveness of the operating algorithm.
Highlights
A photovoltaic (PV) generation system is a type of technology that uses solar cells to convert solar energy into electrical energy
This paper describes in detail the model of a PV battery hybrid system developed through user customization
Regardless of thecurrent, discharge the results indicate that theparameters obtained parameters can represent the it can be seen that the battery model is almost the same correctly represent the nickel–metal hydride (Ni-MH) battery model
Summary
A photovoltaic (PV) generation system is a type of technology that uses solar cells to convert solar energy into electrical energy. The simplest electrical model consists of an ideal voltage source connected in series with the internal resistance [11] This model does not consider the battery SOC. A modified version of the Shepherd model is used in [14]—this modification consists of using a polarization voltage instead of a polarization resistance to eliminate algebraic loop problems This model represents the voltage behavior using only the battery SOC as a state variable. Some studies have modeled PV battery hybrid systems and proposed control techniques [19,20,21]. In this paper, a modeling technique is proposed that allows users to customize the PV battery hybrid systems as a simulation of electromagnetic transient. The effectiveness of the operation of the PV battery hybrid system is verified through simulation
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