Solar, wind and hydro are renewable energy sources that are seen as reliable alternatives to conventional energy sources such as oil or natural gas. However, the efficiency and the performance of renewable energy systems are still under development. Consequently, the control structures of the gridconnected inverter as an important section for energy conversion and transmission should be improved to meet the requirements for grid interconnection. In this paper, a comprehensive simulation and implementation of a threephase grid-connected inverter is presented. The control structure of the grid-side inverter is firstly discussed. Secondly, the space vector modulation SVM is presented. Thirdly, the synchronization for grid-connected inverters is discussed. Finally, the simulation of the grid-connected inverter system using PSIM simulation package and the system implementation are presented to illustrate concepts and compare their results.

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Wind energy has the fastest and highest growth rate of any other Renewable energy sources (RES). Investigating the Wind Energy Conversion Systems (WECS) is very important for improving efficiency. However, It is required a monumental accessible land space for installing Wind turbines(WT). Consequently, this paper presents the design and implementation of a Wind turbine emulator (WTE) to substitute WTs. The proposed WTE includes a new Maximum Point Power Tracking(MPPT) technique based on integrating binary search technique and genetic algorithm. The proposed emulator has an SQLite database as a repository of wind turbine information. Also, it has a graphical user interface(GUI) to facilitate the operation. System components have been modeled and simulated using MATLAB Simulink. Furthermore, a prototype is implemented based on a series excited DC motor and permanent magnet synchronous (PMSG). All static and dynamic characteristics have been investigated to prove the capabilities of the developed emulator. Also, an integration test has been conducted on real-time conditions of wind speed profile and working load for 24 hours to check the reliability. The experimental results are compared with the simulation results for validation and showed the capability of the proposed WTE of emulating a wide range of Wind turbines.

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