# Fault Analysis of a Small PV/Wind Farm Hybrid System Connected to the Grid
## 1 Introduction  
The most environmentally beneficial forms of energy to use are forms of alternative power such as solar and wind power generators. They have matured into a world-wide occurrence, the most rapidly expanding energy source in the world, and a clean, contemporary, effective technology that serves as a ray of vision of the future built on environmentally friendly, durable technology. Because of the worldwide increase in electricity demand, renewable energy sources adoption is more crucial than ever, such as solar photovoltaic (PV) and wind turbine producing systems. In recent years, numerous investments and studies into PV/wind hybrid power systems have been conducted. An example of a hybrid generation system is provided in [1]. That is, a hybrid system is created by connecting a solar and wind system. A technique for managing energy in a hybrid generation system linked to the grid has been introduced, characterized by its capability for versatile energy transfer including standard operation without battery dependency, energy distribution, and energy balancing, making it suitable for both grid and user needs. The authors of [2] provided performance study of grid-connected hybrid power systems for wind and solar during fluctuation in load and climaticcircumstances. The simulation findings in this reference demonstrated the resiliency of the MPPT control techniques in the face of daytime weather changes. Furthermore, the control of power flow technique efficiently meets the plant's critical load demand. A grid-connected solar and wind hybrid energy system's modeling, implementation and performance analysis were initially described in [3]. The effectiveness of MPPT techniques in obtaining the greatest power from hybrid power systems under a variety of environmental situations was demonstrated by the simulation results. Furthermore, because the hybrid power system's injected reactive power is equal to zero, it successfully runs at unity power factor. In addition, the control technique effectively keeps the grid voltage constant despite changes in the outside environment and the power supplied from the hybrid power system. In reference [4], the topic of optimizing and assessing the functioning of a control system for a PV/wind power system connected to the grid is discussed. According to this source, the simulation results showed the proposed system can generate 8884 MWh annually, with a share of 89% wind generation and a 10% contribution from the PV system. The output of the hybrid system is highly reliant on changes in external factors such as the intensity of sunlight and velocity of wind. Because of this, it is imperative to use maximum power point tracking (MPPT) techniques to capture the most power possible under a variety of climatic situations. The MPPT control methods are covered in many kinds of literature [5; 6; 7]. For example, [6] looked into fuzzy logic control to obtain the most power out within a hybrid system of energy and the outcomes demonstrated the reliability of the control algorithms even in default situations and when connected to an electrical grid that is balanced. A total of 3.5 kW of power generated by the solar panel array is synchronized with the grid in a paper [8]. In this study, the inverter voltage and frequency are successfully synchronized with the grid voltage and frequency using a phase-locked loop (PLL). In systems that convert wind energy, the squirrel-cage induction generator (SCIG) is most frequently used [9; 10]. Numerous studies using SCIG and PV-based hybrid technology systems have been conducted [11; 12]. The experimental examination, manipulating and managing the functioning of a hybrid energy system composed of both solar and wind power components was one of them, as provided by [11]. This source states that the maximum generated power for the SCIG wind turbine is 3 kW, while the highest generated power for the PV module is 44.71 W. The authors of [12] suggested power control for a combination wind-biogas-PV system.