| The past few decades has seen rapid growth of renewable energy sources for electric power generation. The main driving forces for this growth are due to the adverse environmental impacts of conventional power plants, their huge costs and losses in long transmission lines. The aforementioned concerns encourage the use of distributed generation (DG) in which the energy sources are installed close to the end users. Renewable energies with their infinite sources (like sun and wind) and the lowest impact on the environment are the first choice for the primary power of DG units.;In a Microgrid with renewable energy sources, the objective is to transfer the maximum possible power. In grid connected mode, since the voltage magnitude and frequency are adapted from the main grid, the controller objectives are different from autonomous operation mode. In grid connected mode the output active and reactive power or input DC-link voltage magnitude can be controlled. In autonomous mode, along with the power balance between the loads and the sources, the voltage magnitude and frequency should be controlled.;To have the same controller strategy in both grid connected and autonomous modes of operation, the droop control is proposed. To verify the proposed controllers, the dynamic simulation of the system is performed using MATLAB/Simulink and validated through laboratory scale experiment. The designed experimental system consists of a Microgrid with two different sources: a nonlinear PV source and a battery source. In addition it includes three different power electronic converters: a unidirectional DC-DC boost converter, a bidirectional buck and boost converter and a three phase inverter. Each converter has its own controller signals coming from different control structure, drivers, sensor boards and digital signal processor (DSP) unit.;Permanent magnet (PM) machines are one of the most popular synchronous machines in wind turbine applications. In the interior permanent magnet (IPM) structure, the equivalent air gap is not uniform and it makes saliency effect obvious. Therefore, both magnetic and reluctance torque can be produced by IPM machine. In this research the dynamic model of interior permanent magnet machine as a wind turbine generator connected to the grid is studied. The control parts are designed to get maximum power from the wind and minimize the generator loss ta the same time. The zero dynamics of the grid connected IPM generator investigated which suggests that the topological structure of the interface filter and the controlled variables have significant effects on the phase behavior of the system. |
